Agere LUCL9500 High-voltage ringing slic for volp application Datasheet

Preliminary Data Sheet
September 2001
L9500A
High-Voltage Ringing SLIC for VoIP Applications
L9500A Introduction
Applications
The Agere Systems Inc. L9500A is a subscriber line
interface circuit that is optimized for short-loop,
power-sensitive applications. This device provides
the complete set of line interface functionality (including power ringing) needed to interface to a subscriber
loop. This device has the capability to operate with a
VCC supply of 3.3 V or 5 V and is designed to minimize external components required at all device
interfaces. This device is optimized to interface to
data over cable service interface specification (DOCSIS) compliant cable modem gateway, multi-media
adaptor, and residential gateway products, such as
the Broadcom® BCM3351, BCM3352, BCM6352,
and BCM1101 and equivalent products.
■
Interface to Broadcom:
— BCM3351 Cable Modem
— BCM3352 Cable Modem
— BCM6352 Integrated Multi-Media Adaptor
— BCM1101 Residential Gateway
■
Cable Modem
■
Voice over Internet Protocol (VoIP)
■
Voice over DSL
■
Remote Subscriber Units
■
Broadband Wireless
■
Short Loop Access
Features
Description
■
Differential ringing and codec interface
■
Onboard ringing generation
■
Three ringing input options:
— Sine wave
— PWM
— Logic level square wave
■
Flexible VCC options:
— 5 V or 3.3 V VCC
— No –5 V required
■
Battery switch to minimize off-hook power
■
Eight operating states:
— Scan mode for minimal power dissipation
— Forward and reverse battery active
— On-hook transmission states
— Ground start
— Ring mode
— Disconnect mode
■
Ultralow on-hook power:
— 27 mW scan mode
— 38 mW active mode
■
Loop start, ring trip, and ground start detection
■
Software-controllable dual current limit option
■
28-pin PLCC package
■
48-pin MLCC package
This device is optimized to provide battery feed, ringing, and supervision on short-loop plain old telephone service (POTS) loops.
This device provides power ring to the subscriber
loop through amplification of a low-voltage input. It
provides forward and reverse battery feed states, onhook transmission, a low-power scan state, ground
start (tip open), and a forward disconnect state.
The device requires a V CC and battery to operate.
VCC may be either a 5 V or a 3.3 V supply. The ringing signal is derived from the high-voltage battery. A
battery switch is included to allow for use of a lowervoltage battery in the off-hook mode, thus minimizing
short-loop off-hook power.
Ring mode overhead is collapsed, allowing rail-to-rail
operation. In this manner, the L9500 can operate
from a lower 75 V battery to minimize critical power
consumption and at the same time extend subscriber
ringing loop lengths to 500 Ω and beyond.
Loop closure, ring trip, and ground start detection is
available. The loop closure detector has a fixed
threshold with hysteresis. The ring trip detector
requires a single-pole filter, thus minimizing external
components required.
The dc current limit is set and fixed by a logic-controllable pin. Ground or open applied to this pin sets the
current limit at the low or high value.
The device is offered with differential ringing and
receive input, making it ideal for direct interface to
DOCSIS compliant cable modem gateway products.
L9500A
High-Voltage Ringing SLIC for VoIP Applications
Preliminary Data Sheet
September 2001
Table of Contents
Contents
Page
L9500A Introduction ..................................................................................................................................................1
Features ..................................................................................................................................................................1
Applications.............................................................................................................................................................1
Description ..............................................................................................................................................................1
Features ....................................................................................................................................................................4
Description.................................................................................................................................................................4
Architecture Diagram.................................................................................................................................................6
Pin Information ..........................................................................................................................................................7
Operating States........................................................................................................................................................9
State Definitions ......................................................................................................................................................10
Forward Active ......................................................................................................................................................10
Reverse Active ......................................................................................................................................................10
Scan ......................................................................................................................................................................10
On-Hook Transmission—Forward Battery ............................................................................................................10
On-Hook Transmission—Reverse Battery ............................................................................................................10
Disconnect ............................................................................................................................................................10
Ring.......................................................................................................................................................................10
Ground Start .........................................................................................................................................................10
Thermal Shutdown ................................................................................................................................................10
Absolute Maximum Ratings (@ TA = 25 °C) ............................................................................................................11
Electrical Characteristics .........................................................................................................................................12
Test Configurations .................................................................................................................................................19
Applications .............................................................................................................................................................21
Power Control .......................................................................................................................................................21
dc Loop Current Limit............................................................................................................................................22
Overhead Voltage .................................................................................................................................................22
Active Mode .......................................................................................................................................................22
Scan Mode .........................................................................................................................................................22
On-Hook Transmission Mode.............................................................................................................................22
Ring Mode ..........................................................................................................................................................22
Loop Range ..........................................................................................................................................................22
Battery Reversal Rate ...........................................................................................................................................23
Supervision ...........................................................................................................................................................23
Loop Closure.........................................................................................................................................................23
Ring Trip ...............................................................................................................................................................23
Ground Start .........................................................................................................................................................23
Power Ring ...........................................................................................................................................................24
Sine Wave Input Signal and Sine Wave Power Ring Signal Output ..................................................................24
ac Applications ........................................................................................................................................................25
ac Parameters.......................................................................................................................................................25
Design Examples ..................................................................................................................................................26
First-Generation Codec ac Interface Network—Resistive Termination..............................................................26
Broadcom 3352 Interface Network........................................................................................................ .............26
Outline Diagrams.....................................................................................................................................................28
28-Pin PLCC .........................................................................................................................................................28
48-Pin MLCC ........................................................................................................................................................29
48-Pin MLCC, JEDEC MO-220 VKKD-2...............................................................................................................30
Ordering Information ...............................................................................................................................................31
2
Agere Systems Inc.
Preliminary Data Sheet
September 2001
L9500A
High-Voltage Ringing SLIC for VoIP Applications
Table of Contents
Figures
Page
Figure 1. Architecture Diagram ................................................................................................................................6
Figure 2. 28-pin PLCC Diagram ...............................................................................................................................7
Figure 3. 48-pin MLF Diagram .................................................................................................................................7
Figure 4. Basic Test Circuit .................................................................................................................................... 19
Figure 5. Metallic PSRR ......................................................................................................................................... 20
Figure 6. Longitudinal PSRR .................................................................................................................................. 20
Figure 7. Longitudinal Balance ............................................................................................................................... 20
Figure 8. ac Gains .................................................................................................................................................. 20
Figure 9. Ringing Waveform Crest Factor = 1.6 ..................................................................................................... 24
Figure 10. Ringing Waveform Crest Factor = 1.2 ................................................................................................... 24
Figure 11. RINGIN Operation .................................................................................................................................. 25
Figure 12. Reference Schematic with Broadcom BCM Embedded Codec Devices and Agere
L9500 SLIC ........................................................................................................................................... 26
Tables
Page
Table 1. Pin Descriptions ........................................................................................................................................8
Table 2. Control States .............................................................................................................................................9
Table 3. Supervision Coding .....................................................................................................................................9
Table 4. Recommended Operating Characteristics .............................................................................................. 11
Table 5. Thermal Characteristics ............................................................................................................................11
Table 6. Environmental ........................................................................................................................................... 12
Table 7. 5 V Supply Currents .................................................................................................................................. 12
Table 8. 5 V Powering .............................................................................................................................................12
Table 9. 3.3 V Supply Currents .............................................................................................................................. 13
Table 10. 3.3 V Powering ....................................................................................................................................... 13
Table 11. 2-Wire Port .............................................................................................................................................14
Table 12. Analog Pin Characteristics .................................................................................................................... 15
Table 13. ac Feed Characteristics ........................................................................................................................ 16
Table 14. Logic Inputs and Outputs (VCC = 5 V) ................................................................................................... 17
Table 15. Logic Inputs and Outputs (VCC = 3.3 V) ................................................................................................ 17
Table 16. Ground Start ........................................................................................................................................... 17
Table 17. Ringing Specifications ............................................................................................................................18
Table 18. Ring Trip ................................................................................................................................................. 18
Table 19. Typical Active Mode On- to Off-Hook Tip/Ring Current-Limit Transient Response ............................... 22
Table 20. FB1 and FB2 Values vs. Typical Ramp Time ........................................................................................ 23
Table 21. Parts List L9500; Agere L9500 and Broadcom BCM3352 (per Broadcom BCM93552SV Application
Board—SLIC Daughter Boad Components); Fully Programmable ........................................................ 27
Agere Systems Inc.
3
L9500A
High-Voltage Ringing SLIC for VoIP Applications
Features
■
On board balanced ringing generation:
— No ring relay
— No bulk ring generator required
— 15 Hz to 70 Hz ring frequency supported
— Sine wave input-sine wave output
— PWM input-sine wave output
— Square wave input-trapezoidal output
■
Power supplies requirements:
— VCC talk battery and ringing battery required
— No –5 V supply required
— No high-voltage positive supply required
■
Flexible Vcc options:
— 5 V or 3.3 V VCC operation
— 5 V or 3.3 V VCC interchangeable and transparent
to users
■
Battery switch via logic control:
— Minimize off-hook power dissipation
■
Minimal external components required
■
Eight operating states:
— Forward active, V BAT2 applied
— Polarity reversal active, VBAT2 applied
— On-hook transmission, VBAT1 applied
— On-hook transmission polarity reversal, V BAT1
applied
— Ground start
— Scan
— Forward disconnect
— Ring mode
■
Unlatched parallel data control interface
■
Ultralow SLIC power:
— Scan 38 mW (VCC = 5 V)
— Forward/reverse active 54 mW (VCC = 5 V)
— Scan 27 mW (VCC = 3.3 V)
— Forward/reverse active 41 mW (VCC = 3.3 V)
■
4
Supervision:
— Loop start, fixed threshold with hysteresis
— Ring trip, single-pole ring trip filtering, fixed threshold as a function of battery voltage
— Ground start fixed threshold with hysteresis
Preliminary Data Sheet
September 2001
■
Adjustable current limit:
— 25 mA or 40 mA via ground or open to control
input
■
Overhead voltage:
— Clamped typically <51 V differentially
— Clamped maximum <56.5 V single-ended
■
Thermal shutdown protection with hysteresis
■
Device interfaces:
— Differential receive interface
— Singled-ended transmit interface
— Differential ring input
■
Package options:
— 28-pin PLCC
— 48-pin MLCC
■
90 V CBIC-S technology
Description
The L9500 is designed to provide battery feed, ringing,
and supervision functions on short plain old telephone
service (POTS) loops. This device is designed for
ultralow power in all operating states.
The L9500 offers 8 operating states. The device
assumes use of a lower-voltage talk battery, a highervoltage ringing battery, and a VCC supply.
The L9500 requires only a positive VCC supply. No
–5 V supply is needed. The L9500 can operate with a
VCC of either 5 V or 3.3 V, allowing for greater user flexibility. The choice of VCC voltage is transparent to the
user; the device will function with either supply voltage
connected.
Two batteries are used:
1. A high-voltage ring battery (V BAT1).
VBAT1 is a maximum –75 V. VBAT1 is used for power
ring signal amplification and for scan, on-hook
transmission, and ground start modes. This supply
is current limited to approximately the maximum
power ringing current, typically 50 mA.
2. A lower-voltage talk battery (VBAT2).
VBAT2 is used for active mode powering.
Agere Systems Inc.
Preliminary Data Sheet
September 2001
L9500A
High-Voltage Ringing SLIC for VoIP Applications
Description (continued)
Forward and reverse battery active modes are used for
off-hook conditions. Since this device is designed for
short-loop applications, the lower-voltage VBAT2 is
applied during the forward and reverse active states.
Battery reversal is quiet, without breaking the ac path.
Rate of battery reversal may be ramped to control
switching time.
The magnitude of the overhead voltage in the forward
and reverse active modes has a typical default value of
7.0 V, allowing for an on-hook transmission of an undistorted signal of 3.14 dBm into 900 Ω. Additionally, this
allows sufficient overhead for 500 mV of meter pulse if
desired. This overhead is fixed. The ring trip detector is
turned off during active modes to conserve power.
Because on-hook transmission is not allowed in the
scan mode, an on-hook transmission mode is defined.
This mode is functionally similar to the active mode,
except the tip ring voltage is derived from the higher
VBAT1 rather than VBAT2.
In the on-hook transmission modes with a primary battery whose magnitude is greater than a nominal
51 V, the magnitude of the tip-to-ground and ring-toground voltage is clamped at less than 56.5 V.
To minimize on-hook power, a low-power scan mode is
available. In this mode, all functions except off-hook
supervision are turned off to conserve power. On-hook
transmission is not allowed in the scan mode.
In the scan mode with a primary battery whose magnitude is greater than a nominal 51 V, the magnitude of
the tip-to-ground and ring-to-ground voltage is clamped
at less than 56.5 V.
A forward disconnect mode is provided, where all circuits are turned off and power is denied to the loop.
The device offers a ring mode, in which a power ring
signal is provided to the tip/ring pair. During the ring
mode, a user-supplied, low-voltage ring signal is differentially input to the device’s RINGIN input. This signal is
amplified to produce the power ring signal. This signal
may be a sine wave or filtered square wave to produce
a sine wave on trapezoidal output. Ring trip detector
and common-mode current detector are active during
the ring mode.
With maximum VBAT1 and a sine wave input, the L9500
has sufficient power to ring a 5 REN (1386 Ω + 40 µF)
ringing load into 500 Ω of physical resistance.
Both the ring trip and loop closure supervision functions are included. The loop closure has a fixed typical
10.5 mA on- to off-hook threshold in the active mode
and a fixed 11.5 mA on- to off-hook threshold from the
scan mode. In either case, there is a 2 mA hysteresis.
The ring trip detector requires only a single-pole filter at
the input, minimizing external components. The ring
trip threshold at a given battery voltage is fixed. Typical
ring trip threshold is 42.5 mA for a –70 V V BAT1.
The device offers a ground start mode. In this mode the
tip drive amplifier is turned off. The device presents a
high impedance (>100 kΩ) to PT and a current limited
battery (VBAT1) to PR. VBAT1 is clamped to less than
56.5 V in this mode at PR. The NSTAT loop current
detctor is used for ring ground detection. In the ground
start mode, since the loop current is common mode,
the loop closure threshold is reduced in half, thus maintaining loop supervision at specified levels.
Upon reaching the thermal shutdown temperature, the
device will enter an all off mode. Upon cooling, the
device will re-enter the state it was in prior to thermal
shutdown. Hysteresis is built in to prevent oscillation.
Data control is via a parallel unlatched control scheme.
The dc current limit is fixed to either 25 mA or 40 mA
depending if ground or open is applied to the VPROG
current limit programming pin. Programming accuracy
is ±8%.
Circuitry is added to the L9500 to minimize the inrush
of current from the VCC supply and to the battery supply
during an on- to off-hook transition, thus saving in
power supply design cost. See the Applications section
of this data sheet for more information.
The L9500 uses a voltage feed-current sense architecture; thus the transmit gain is a transconductance. The
L9500 transconductance is set via a single external
resistor, and this device is designed for optimal performance with a transconductance set at 300 V/A. This
interface is single ended. The L9500 offers a differential receive interface with a gain of 8.
The L9500 is internally referenced to 1.5 V. This reference voltage is output at the VREF output of the device.
The SLIC output VITR is also referenced to 1.5 V. The
SLIC inputs RCVP/RCVN are floating inputs.
The L9500 is packaged in a 28-pin PLCC or a 48-pin
MLCC package.
This feature eliminates the need for a separate external
ring relay, associated external circuitry, and a bulk ringing generator. See the Applications section of this data
sheet for more information.
Agere Systems Inc.
5
L9500A
High-Voltage Ringing SLIC for VoIP Applications
Preliminary Data Sheet
September 2001
Architecture Diagram
AGND
VCC
BGND VBAT2
VBAT1
VREF
VITR
POWER
B = 20
VPROG
NSTAT
CURRENT
LIMIT
AND
INRUSH
CONTROL
RTFLT
DCOUT
RING
TRIP
LOOP
CLOSURE
AAC
TXI
1.5 V
BAND-GAP
REFERENCE
VITR
ITR
RECTIFIER
–
VTX
OUT
AX
+
(ITR/306)
VREF
18 Ω
TIP/RING
CURRENT
SENSE
18 Ω
X1
CF1
+1
+
VREG
FB2
FB1
+
RFR
PT
CF2
–
RFT
PR
X1
ac INTERFACE
–1
–
–
GAIN
RCVN
+
RCVP
GAIN = 4
VREG
RINGING
35x
RINGINN RINGINP
PARALLEL
DATA
INTERFACE
B0
B1
B2
12-3530.F (F)
Figure 1. Architecture Diagram
6
Agere Systems Inc.
L9500A
High-Voltage Ringing SLIC for VoIP Applications
Preliminary Data Sheet
September 2001
RCVN
RCVP
VITR
NSTAT
TXI
VTX
ITR
Pin Information
4
3
2
1
28
27
26
RINGINN
5
25
B0
RINGINP
6
24
B1
DCOUT
7
23
B2
CF2
8
22
PR
CF1
9
21
PT
RTFLT
10
20
FB1
VREF
11
19
FB2
12
13
14
15
16
17
18
AGND
VCC
VBAT1
VBAT2
BGND
NC
VPROG
L9500
28-PIN PLCC
PINOUT
12-3558e
48 47 46 45 44 43
NC
ITR
VTX
NC
TXI
NC
NSTAT
NC
VITR
NC
RCVP
RCVN
Figure 2. 28-pin PLCC Diagram
42 41 40 39 38 37
1
36
NC
RINGINP
2
35
B0
NC
3
34
B1
NC
4
33
B2
NC
5
32
NC
31
PR
30
NC
RINGINN
L9500
48-PIN MLCC
PINOUT
DCOUT
6
NC
7
CF2
8
29
NC
NC
9
28
PT
CF1
10
27
NC
NC
11
26
FB1
RTFLT
12
25
FB2
VPROG
BGND
22 23 24
NC
VBAT2
NC
VBAT1
NC
NC
V CC
NC
AGND
VREF
13 14 15 16 17 18 19 20 21
12-3361.b
Figure 3. 48-pin MLF Diagram
Agere Systems Inc.
7
L9500A
High-Voltage Ringing SLIC for VoIP Applications
Preliminary Data Sheet
September 2001
Pin Information (continued)
Table 1. Pin Descriptions
28-Pin
PLCC
1
48-Pin
MLCC
43
Symbol
Type
NSTAT
O
2
45
VITR
3
47
RCVP
4
48
RCVN
5
1
RINGINN
6
2
RINGINP
7
6
DCOUT
8
9
10
8
10
12
CF2
CF1
RTFLT
11
13
VREF
12
13
15
16
AGND
VCC
14
15
16
17
19
21
23
3, 4, 5, 7, 9, 11,
14, 17, 18, 20,
22, 27, 29, 30,
32, 36, 37, 40,
42, 44, 46
24
VBAT1
VBAT2
BGND
NC
18
8
VPROG
Name/Function
Loop Closure Detector Output—Ring Trip Detector Output.
When low, this logic output indicates that an off-hook condition
exists or ringing is tripped or a ring ground has occurred.
O
Transmit ac Output Voltage. Output of internal AAC amplifier.
This output is a voltage that is directly proportional to the differential ac tip/ring current.
I
Receive ac Signal Input (Noninverting). This high-impedance
input controls to ac differential voltage on tip and ring. This node
is a floating input.
I
Receive ac Signal Input (Inverting). This high-impedance
input controls to ac differential voltage on tip and ring. This node
is a floating input.
I
Power Ring Signal Input. Couple to a sine wave or lower crest
factor low-voltage ring signal. The input here is amplified to provide the full power ring signal at tip and ring. This signal may be
applied continuously, even during nonringing states.
I
Power Ring Signal Input. Couple to a sine wave or lower crest
factor low-voltage ring signal. The input here is amplified to provide the full power ring signal at tip and ring. This signal may be
applied continuously, even during nonringing states.
O
dc Output Voltage. This output is a voltage that is directly proportional to the absolute value of the differential tip/ring current.
This is used to set ring trip threshold.
—
Filter Capacitor. Connect a capacitor from this node to ground.
—
Filter Capacitor. Connect a capacitor from this node to CF2.
—
Ring Trip Filter. Connect this lead to DCOUT via a resistor and
to AGND with a capacitor to filter the ring trip circuit to prevent
spurious responses. A single-pole filter is needed.
O
SLIC Internal Reference Voltage. Output of internal 1.5 V reference voltage.
GND Analog Signal Ground.
PWR Analog Power Supply. User choice of 5 V or 3.3 V nominal
power or supply.
PWR Battery Supply 1. High-voltage battery.
PWR Battery Supply 2. Lower-voltage battery.
GND Battery Ground. Ground return for the battery supplies.
—
No Connection.
I
Current-Limit Program Input. Connect ground to this pin to set
current limit to 25 mA; leave this pin open to set current limit to
40 mA.
Agere Systems Inc.
L9500A
High-Voltage Ringing SLIC for VoIP Applications
Preliminary Data Sheet
September 2001
Pin Information (continued)
Table 1. Pin Descriptions (continued)
28-Pin
PLCC
19
48-Pin
MLCC
25
Symbol
Type
Name/Function
FB2
—
20
26
FB1
—
21
28
PT
I/O
22
31
PR
I/O
23
24
25
26
33
34
35
38
B2
B1
B0
ITR
Iu
Iu
Iu
I
27
39
VTX
O
28
41
TXI
I
Polarity Reversal Slowdown Capacitor. Connect a capacitor
from this node for controlling rate of battery reversal. If ramped battery reversal is not desired, this pin is left open.
Polarity Reversal Slowdown Capacitor. Connect a capacitor
from this node for controlling rate of battery reversal. If ramped battery reversal is not desired, this pin is left open.
Protected Tip. The output drive of the tip amplifier and input to the
loop sensing circuit. Connect to loop through overvoltage and
overcurrent protection.
Protected Ring. The output drive of the ring amplifier and input to
the loop sensing circuit. Connect to loop through overvoltage and
overcurrent protection.
State Control Input. These pins have an internal 100 kΩ pull-up.
State Control Input. These pins have an internal 100 kΩ pull-up.
State Control Input. These pins have an internal 100 kΩ pull-up.
Transmit Gain. Input to AX amplifier. Connect a 4.75 kΩ resistor
from this node to VTX to set transmit gain. Gain shaping for termination impedance with a first generation codec is also achieved
with a network from this node to VTX.
ac Output Voltage. Output of internal AX amplifier. The voltage at
this pin is directly proportional to the differential tip/ring current.
ac/dc Separation. Input to internal AAC amplifier. Connect a
0.1 µF capacitor from this pin to VTX.
Operating States
Table 2. Control States
B0
0
0
0
0
1
1
1
1
B1
0
1
0
1
1
0
1
0
B2
1
1
0
0
0
0
1
1
State
Forward active
Reverse active
On-hook transmission forward battery
On-hook transmission reverse battery
Ground start
Scan
Disconnect—device will power up in this state
Ring
Table 3. Supervision Coding
NSTAT
0 = off-hook or ring trip or thermal shutdown or ring ground.
1 = on-hook and no ring trip and no thermal shutdown and no ring ground.
Agere Systems Inc.
9
L9500A
High-Voltage Ringing SLIC for VoIP Applications
Preliminary Data Sheet
September 2001
State Definitions
On-Hook Transmission—Reverse Battery
Forward Active
■
Pin PR is positive with respect to PT.
■
VBAT1 is applied to tip/ring drive amplifiers.
■
Supervision circuits, loop closure, and commonmode detect are active.
■
Pin PT is positive with respect to PR.
■
VBAT2 is applied to tip/ring drive amplifiers.
■
Loop closure and common-mode detect are active.
■
Ring trip detector is turned off to conserve power.
■
Ring trip detector is turned off to conserve power.
■
On-hook transmission is allowed.
■
Overhead is set to nominal 6.0 V for undistorted
transmission of 3.14 dBm into 900 Ω.
■
The tip-to-ring on-hook differential voltage will be typically between –41 V and –49 V with a –70 V primary
battery.
Reverse Active
Disconnect
■
Pin PR is positive with respect to PT.
■
VBAT2 is applied to tip/ring drive amplifiers.
■
Loop closure and common-mode detect are active.
■
Ring trip detector is turned off to conserve power.
■
Overhead is set to nominal 6.0 V for undistorted
transmission of 3.14 dBm into 900 Ω.
Scan
■
Except for loop closure, all circuits (including ring trip
and common-mode detector) are powered down.
■
The tip/ring amplifiers and all supervision are turned
off.
■
The SLIC goes into a high-impedance state.
■
NSTAT is forced high (on-hook).
■
Device will power up in this state.
Ring
■
Power ring signal is applied to tip and ring.
■
Input waveform at RINGIN is amplified.
■
On-hook transmission is disabled.
■
■
Pin PT is positive with respect to PR, and VBAT1 is
applied to tip/ring.
Ring trip supervision and common-mode current
supervision are active; loop closure is inactive.
■
Overhead voltage is reduced to typically 4 V.
■
Current is limited by saturation current of the amplifiers themselves, typically 100 mA at 125 °C.
■
The tip to ring on-hook differential voltage will be typically between –44 V and –51 V with a –70 V primary
battery.
On-Hook Transmission—Forward Battery
■
Pin PT is positive with respect to PR.
■
VBAT1 is applied to tip/ring drive amplifiers.
■
Supervision circuits, loop closure, and commonmode detect are active.
■
Ring trip detector is turned off to conserve power.
■
On-hook transmission is allowed.
■
The tip-to-ring on-hook differential voltage will be typically between –41 V and –49 V with a –70 V primary
battery.
10
Ground Start
■
Tip drive amplifer is turned off.
■
Device presents a high impedance (>100 kΩ) to pin
PT.
■
Device presents a clamped (<56.5 V) current-limited
battery (VBAT1) to PR.
■
Output pin RGDET indicates current flowing in the
ring lead.
Thermal Shutdown
■
Not controlled via truth table inputs.
■
This mode is caused by excessive heating of the
device, such as may be encountered in an extended
power-cross situation. NSTAT output is forced low or
off hook during a thermal shutdown event.
Agere Systems Inc.
L9500A
High-Voltage Ringing SLIC for VoIP Applications
Preliminary Data Sheet
September 2001
Absolute Maximum Ratings (@ TA = 25 °C)
Stresses in excess of the absolute maximum ratings can cause permanent damage to the device. These are absolute stress ratings only. Functional operation of the device is not implied at these or any other conditions in excess
of those given in the operational sections of the data sheet. Exposure to absolute maximum ratings for extended
periods can adversely affect device reliability.
Parameter
dc Supply (VCC)
Battery Supply (VBAT1)
Battery Supply (VBAT2)
Logic Input Voltage
Logic Output Voltage
Operating Temperature Range
Storage Temperature Range
Relative Humidity Range
PT or PR Fault Voltage (dc)
PT or PR Fault Voltage (10 x 1000 µs)
Ground Potential Difference (BGND to AGND)
Symbol
—
—
—
—
—
—
—
—
VPT, VPR
VPT, VPR
—
Min
–0.5
—
—
–0.5
–0.5
–40
–40
5
VBAT – 5
VBAT – 15
—
Max
7.0
–80
VBAT1
VCC + 0.5
VCC + 0.5
125
150
95
3
15
±1
Unit
V
V
V
V
V
°C
°C
%
V
V
V
Note: The IC can be damaged unless all ground connections are applied before, and removed after, all other connections. Furthermore, when
powering the device, the user must guarantee that no external potential creates a voltage on any pin of the device that exceeds the
device ratings. For example, inductance in a supply lead could resonate with the supply filter capacitor to cause a destructive overvoltage.
Table 4. Recommended Operating Characteristics
Parameter
5 V dc Supplies (VCC)
3 V dc Supplies (VCC)
High Office Battery Supply (VBAT1)
Auxiliary Office Battery Supply (VBAT2)
Operating Temperature Range
Min
—
3.13
–60
–12
–40
Typ
5.0
3.3
–70
—
25
Max
5.25
—
–75
VBAT1
85
Unit
V
V
V
V
°C
Table 5. Thermal Characteristics
Parameter
Thermal Protection Shutdown (Tjc)
Min
150
Typ
165
Max
—
Unit
°C
28 PLCC Thermal Resistance Junction to Ambient (θJA)1, 2:
Natural Convection 2S2P Board
Natural Convection 2S0P Board
Wind Tunnel 100 Linear Feet per Minute (LFPM) 2S2P Board
Wind Tunnel 100 Linear Feet per Minute (LFPM) 2S0P Board
—
—
—
—
35.5
50.5
31.5
42.5
—
—
—
—
°C/W
°C/W
°C/W
°C/W
48 MLF Thermal Resistance Junction to Ambient (θJA)1, 2:
—
38
—
°C/W
1. This parameter is not tested in production. It is guaranteed by design and device characterization.
2. Airflow, PCB board layers, and other factors can greatly affect this parameter.
Agere Systems Inc.
11
L9500A
High-Voltage Ringing SLIC for VoIP Applications
Preliminary Data Sheet
September 2001
Electrical Characteristics
Table 6. Environmental
Parameter
Temperature Range
Humidity Range1
Min
–40
Typ
—
Max
85
Unit
°C
5
—
951
%RH
Min
Typ
Max
Unit
—
—
—
4.30
0.24
3
4.80
0.35
6
mA
mA
µA
—
—
—
5.95
25
1.2
7.0
85
1.40
mA
µA
mA
—
—
—
6.0
1.5
1.5
7.0
1.9
6
mA
mA
µA
—
—
—
2.7
15
3.5
3.75
110
25
mA
µA
µA
—
—
—
4.0
0.24
2
—
—
—
mA
mA
µA
—
—
—
5.9
1.8
2
6.5
2.2
6
mA
mA
µA
Min
—
—
—
—
—
—
Typ
38
57
135
14
37
156
Max
46
64
165
23
—
184
Unit
mW
mW
mW
mW
mW
mW
1. Not to exceed 26 grams of water per kilogram of dry air.
Table 7. 5 V Supply Currents
VBAT1 = –70 V, VBAT2 = –21 V, VCC = 5 V.
Parameter
Supply Currents (scan state; no loop current):
IVCC
IVBAT1
IVBAT2
Supply Currents (forward/reverse active; no loop current, with or without PPM,
VBAT2 applied):
IVCC
IVBAT1
IVBAT2
Supply Currents (on-hook transmission mode; no loop current, with or without
PPM, VBAT1 applied):
IVCC
IVBAT1
IVBAT2
Supply Currents (disconnect mode):
IVCC
IVBAT1
IVBAT2
Supply Currents (ground start mode, no loop current):
IVCC
IVBAT1
IVBAT2
Supply Currents (ring mode; no load):
IVCC
IVBAT1
IVBAT2
Table 8. 5 V Powering
VBAT1 = –70 V, VBAT2 = –21 V, VCC = 5 V.
Parameter
Power Dissipation (scan state; no loop current)
Power Dissipation (forward/reverse active; no loop current, VBAT2 applied)
Power Dissipation (on-hook transmission mode; no loop current, V BAT1 applied)
Power Dissipation (disconnect mode)
Power Dissipation (ground start mode)
Power Dissipation (ring mode; no load)
12
Agere Systems Inc.
Preliminary Data Sheet
September 2001
L9500A
High-Voltage Ringing SLIC for VoIP Applications
Electrical Characteristics (continued)
Table 9. 3.3 V Supply Currents
VBAT1 = –70 V, VBAT2 = –21 V, VCC = 3.3 V.
Parameter
Supply Currents (scan state; no loop current):
IVCC
IVBAT1
IVBAT2
Supply Currents (forward/reverse active; no loop current, VBAT2 applied):
IVCC
IVBAT1
IVBAT2
Supply Currents (on-hook transmission mode; no loop current, VBAT1 applied):
IVCC
IVBAT1
IVBAT2
Supply Currents (disconnect mode):
IVCC
IVBAT1
IVBAT2
Supply Currents (ground start mode, no loop current):
IVCC
IVBAT1
IVBAT2
Supply Currents (ring mode; no load):
IVCC
IVBAT1
IVBAT2
Min
Typ
Max
Unit
—
—
—
3.2
0.24
3
3.6
0.35
6
mA
mA
µA
—
—
—
4.8
25
1.2
5.7
85
1.4
mA
µA
mA
—
—
—
4.9
1.5
1.5
5.7
1.9
6
mA
mA
µA
—
—
—
1.8
8
2
2.5
110
25
mA
µA
µA
—
—
—
3.1
0.24
2
—
—
—
mA
mA
µA
—
—
—
4.70
1.8
2
5.4
2.2
6
mA
mA
µA
Min
—
—
—
—
—
—
Typ
27
42
121
6.5
27
141
Max
36.5
53
151
15
—
172
Unit
mW
mW
mW
mW
mW
mW
Table 10. 3.3 V Powering
VBAT1 = –70 V, VBAT2 = –21 V, VCC = 3.3 V.
Parameter
Power Dissipation (scan state; no loop current)
Power Dissipation (forward/reverse active; no loop current, VBAT2 applied)
Power Dissipation (on-hook transmission mode; no loop current, V BAT1 applied)
Power Dissipation (disconnect mode)
Power Dissipation (ground start mode)
Power Dissipation (ring mode; no loop current)
Agere Systems Inc.
13
L9500A
High-Voltage Ringing SLIC for VoIP Applications
Preliminary Data Sheet
September 2001
Electrical Characteristics (continued)
Table 11. 2-Wire Port
Parameter
Tip or Ring Drive Current = dc + Longitudinal + Signal Currents
Tip or Ring Drive Current = Ringing + Longitudinal
Signal Current
Longitudinal Current Capability per Wire (Longitudinal current is independent of dc loop current.)
Ringing Current (RLOAD = 1386 Ω + 40 µF)
Ringing Current Limit (RLOAD = 100 Ω)
dc Loop Current—ILIM (VBAT2 applied, RLOOP = 100 Ω):
VPROG = 0
VPROG = Open
dc Current Variation
dc Feed Resistance (does not include protection resistors)
Open Loop Voltages:
Scan Mode:
|VBAT1| > 51 V |VTIP| – |VRING|
PR to Battery Ground
PT to Battery Ground
OHT Mode:
|VBAT1| > 51 V |VTIP| – |VRING|
PR to Battery Ground
PT to Battery Ground
Active Mode:
|PT – PR| – |VBAT2|
Ring Mode:
|PT – PR| – |VBAT1|
14
Min
105
65
10
8.5
Typ
—
—
—
15
Max
—
—
—
—
Unit
mAp
mAp
mArms
mArms
29
—
—
—
—
50
mArms
mAp
—
—
—
—
25
40
—
50
—
—
±8
—
mA
mA
%
Ω
44
—
—
51
—
—
—
56.5
56.5
V
V
V
41
—
—
49
—
—
—
56.5
56.5
V
V
V
5.75
6.25
7.75
V
—
4
—
V
Agere Systems Inc.
L9500A
High-Voltage Ringing SLIC for VoIP Applications
Preliminary Data Sheet
September 2001
Electrical Characteristics (continued)
Table 11. 2-Wire Port (continued)
Parameter
Loop Closure Threshold:
Active/On-hook Transmission Modes
Scan Mode
Loop Closure Threshold Hysteresis:
VCC = 5 V
VCC = 3.3 V
Longitudinal to Metallic Balance at PT/PR
Test Method: Q552 (11/96) Section 2.1.2 and IEEE® 455:
300 Hz to 600 Hz
600 Hz to 3.4 kHz
Metallic to Longitudinal (harm) Balance:
200 Hz to 1000 Hz
100 Hz to 4000 Hz
PSRR 500 Hz—3000 Hz:
VBAT1, VBAT2
VCC (5 V operation)
Min
Typ
Max
Unit
—
—
10.5
11.5
—
—
mA
mA
—
—
2
2
—
—
mA
mA
52
52
—
—
—
—
dB
dB
40
40
—
—
—
—
dB
dB
45
35
—
—
—
—
dB
dB
Table 12. Analog Pin Characteristics
Parameter
TXI (input impedance)
Output Offset (VTX)
Output Offset (VITR)
Output Drive Current (VTX)
Output Drive Current (VITR)
Output Voltage Swing:
Maximum (VTX, VITR)
Minimum (VTX)
Minimum (VITR)
Output Short-circuit Current
Output Load Resistance
Output Load Capacitance
RCVN and RCVP:
Input Voltage Range (VCC = 5 V)
Input Voltage Range (VCC = 3.3 V)
Input Bias Current
Differential PT/PR Current Sense (DCOUT):
Gain (PT/PR to DCOUT)
Offset Voltage at ILOOP = 0
Agere Systems Inc.
Min
Typ
Max
Unit
—
—
—
±300
±10
100
—
—
—
—
—
±10
100
—
—
kΩ
mV
mV
µA
µA
AGND
AGND + 0.25
AGND + 0.35
—
10
—
—
—
—
—
—
20
VCC
VCC – 0.5
VCC – 0.4
±50
—
—
V
V
V
mA
kΩ
pF
0
0
—
—
—
0.05
VCC – 0.5
VCC – 0.3
—
V
V
µA
—
–10
67
—
—
10
V/A
mV
15
L9500A
High-Voltage Ringing SLIC for VoIP Applications
Preliminary Data Sheet
September 2001
Electrical Characteristics (continued)
Table 13. ac Feed Characteristics
Parameter
1
ac Termination Impedance
Total Harmonic Distortion (200 Hz—4 kHz) 2:
Off-hook
On-hook
Transmit Gain (f = 1004 Hz, 1020 Hz)3:
PT/PR Current to VITR
Receive Gain, f = 1004 Hz, 1020 Hz Open Loop
RCVP or RCVN to PT—PR
Gain vs. Frequency (transmit and receive)2 600 Ω Termination,
1004 Hz, 1020 Hz reference:
200 Hz—300 Hz
300 Hz—3.4 kHz
3.4 kHz—20 kHz
20 kHz—266 kHz
Gain vs. Level (transmit and receive)2 0 dBV Reference:
–55 dB to +3.0 dB
Idle-channel Noise (tip/ring) 600 Ω Termination:
Psophometric
C-Message
3 kHz Flat
Idle-channel Noise (VTX) 600 Ω Termination:
Psophometric
C-Message
3 kHz Flat
Min
Typ
Max
Unit
150
600
1400
Ω
—
—
—
—
0.3
1.0
%
%
300 – 3%
300
300 + 3%
V/A
7.76
8
8.24
—
–0.3
–0.05
–3.0
—
0
0
0
—
0.05
0.05
0.05
2.0
dB
dB
dB
dB
–0.05
0
0.05
dB
—
—
—
–82
8
—
–77
13
20
dBmp
dBrnC
dBrn
—
—
—
–82
8
—
–77
13
20
dBmp
dBrnC
dBrn
1. Set externally either by discrete external components or a third- or fourth-generation codec. Any complex impedance R1 + R2 || C between
150 Ω and 1400 Ω can be synthesized.
2. This parameter is not tested in production. It is guaranteed by design and device characterization.
3. VITR transconductance depends on the resistor from ITR to VITR. This gain assumes an ideal 4750 Ω, the recommended value. Positive current is defined as the differential current flowing from PT to PR.
16
Agere Systems Inc.
Preliminary Data Sheet
September 2001
L9500A
High-Voltage Ringing SLIC for VoIP Applications
Electrical Characteristics (continued)
Table 14. Logic Inputs and Outputs (VCC = 5 V)
Parameter
Input Voltages:
Low Level
High Level
Input Current:
Low Level (VCC = 5.25 V, VI = 0.4 V)
High Level (VCC = 5.25 V, VI = 2.4 V)
Output Voltages (open collector with internal pull-up resistor):
Low Level (VCC = 4.75 V, IOL = 360 µA)
High Level (VCC = 4.75 V, IOH = –20 µA)
Symbol
Min
Typ
Max
Unit
VIL
VIH
–0.5
2.0
0.4
2.4
0.7
VCC
V
V
IIL
IIH
—
—
—
—
±100
±75
µA
µA
VOL
VOH
0
2.4
0.2
—
0.4
VCC
V
V
Symbol
Min
Typ
Max
Unit
VIL
VIH
–0.5
2.0
0.2
2.5
0.5
VCC
V
V
IIL
IIH
—
—
—
—
±50
±50
µA
µA
VOL
VOH
0
2.2
0.2
—
0.5
VCC
V
V
Table 15. Logic Inputs and Outputs (VCC = 3.3 V)
Parameter
Input Voltages:
Low Level
High Level
Input Current:
Low Level (VCC = 3.46 V, VI = 0.4 V)
High Level (VCC = 3.46 V, VI = 2.4 V)
Output Voltages (open collector with internal 60 kΩ pull-up resistor):
Low Level (VCC = 3.13 V, IOL = 360 µA)
High Level (VCC = 3.13 V, IOH = –5 µA)
Table 16. Ground Start
Parameter
Tip Open Mode—Tip Input Impedance
Threshold
Hysteresis:
VCC = 5 V
VCC = 3.3 V
Agere Systems Inc.
Min
Typ
Max
Unit
150
—
—
13
—
—
kΩ
mA
—
—
2
2
—
—
mA
mA
17
L9500A
High-Voltage Ringing SLIC for VoIP Applications
Preliminary Data Sheet
September 2001
Electrical Characteristics (continued)
Table 17. Ringing Specifications
Parameter
RINGINN/P:
Input Voltage Swing
Input Impedance
Ring Signal Isolation:
PT/PR to VTX
Ring Mode
Ring Signal Isolation:
RINGIN to PT/PR
Nonring Mode
Ring Signal Distortion:
5 REN 1380 Ω, 40 µF Load, 100 Ω Loop
Differential Gain:
RINGINN/P to PT/PR—VRINGINN/P = 0.7 Vp, VBAT1 = –70 V, R LOAD = 1400 Ω
Min
Typ
Max
Unit
0
—
—
—
100
60
VCC
—
—
V
kΩ
dB
—
80
—
dB
—
3
—
%
115
128
140
—
Table 18. Ring Trip
Parameter
Ring Trip (NSTAT = 0):
Loop Resistance (total) VBAT1 applied
Ring Trip (NSTAT = 1):
Loop Resistance (total) VBAT1 applied
Trip Time (f = 20 Hz)
Hysteresis
Min
Typ
Max
Unit
100
—
600
Ω
—
—
—
—
—
7
10
100
—
kΩ
ms
mA
Ringing will not be tripped by the following loads:
■
10 kΩ resistor in parallel with a 6 µF capacitor applied across tip and ring. Ring frequency = 17 Hz to 23 Hz.
■
100 Ω resistor in series with a 2 µF capacitor applied across tip and ring. Ring frequency = 17 Hz to 23 Hz.
18
Agere Systems Inc.
L9500A
High-Voltage Ringing SLIC for VoIP Applications
Preliminary Data Sheet
September 2001
Test Configurations
RTFLT
RINGINN
RINGIN
RINGINP
RINGIN
0.1 µF
383 kΩ
26.7 kΩ
DCOUT
30 Ω
RCVP
PR
TIP
60.4 kΩ
69.8 kΩ
RCVN
RLOOP
100 Ω/600 Ω
RCV
RCV
0.1 µF
30 Ω
VITR
PT
RING
L9500
BASIC
TEST
CIRCUIT
VPROG
VITR
0.1 µF
TXI
VTX
4750 Ω
VREF
ITR
FB2
FB1
CF1
0.1 µF
CF2
0.1 µF
VBAT2
VBAT1
BGND VCC
0.1 µF
AGND
B0
B0
B1
B1
B2
B2
NSTAT
0.1 µF
0.1 µF
VBAT2
VBAT1
VCC
Figure 4. Basic Test Circuit
Agere Systems Inc.
19
L9500A
High-Voltage Ringing SLIC for VoIP Applications
Preliminary Data Sheet
September 2001
Test Configurations (continued)
100 µF
VBAT OR VCC
100 Ω
TIP
VS
DISCONNECT
BYPASS CAPACITOR
4.7 µF
368 Ω
+
VM
368 Ω
VS
BASIC
TEST CIRCUIT
–
RING
100 µF
VBAT OR
VCC
TIP
+
600 Ω
BASIC
TEST CIRCUIT
VT/R
VS
VM
LONGITUDINAL BALANCE = 20log
12-2584.c (F)
–
RING
Figure 7. Longitudinal Balance
PSRR = 20log
VS
VT/R
12-2582.c (F)
+
600 Ω
VT/R
–
V BAT OR VCC
100 Ω
4.7 µF
VITR
PT
Figure 5. Metallic PSRR
BASIC
TEST CIRCUIT
PR
RCV
DISCONNECT
BYPASS CAPACITOR
RCV
VS
VS
V BAT OR
V CC
67.5 Ω
TIP
10 µF
+
VM
–
67.5 Ω
56.3 Ω
GXMT =
VXMT
VT/R
GRCV =
V T/R
VRCV
BASIC
TEST CIRCUIT
12-2587.G (F)
Figure 8. ac Gains
RING
10 µF
PSRR = 20log
VS
VM
12-2583.b (F)
Figure 6. Longitudinal PSRR
20
Agere Systems Inc.
Preliminary Data Sheet
September 2001
L9500A
High-Voltage Ringing SLIC for VoIP Applications
Applications
Power Control
Under normal device operating conditions, power dissipation on the device must be controlled to prevent the
device temperature from rising above the thermal shutdown and causing the device to shut down. Power dissipation is highest with higher battery voltages, higher
current limit, and under shorter dc loop conditions.
Additionally, higher ambient temperature will also
reduce thermal margin.
To support required power ringing voltages, this device
is meant to operate with a high-voltage primary battery
(–65 V to –75 V typically). Thus, power control is normally achieved by use of the battery switch and an auxiliary lower absolute voltage battery. Operating
temperature range, maximum current limit, maximum
battery voltage, minimum dc loop length and protection
resistors values, airflow, and number of PC board layers will influence the overall thermal performance. The
following example illustrates typical thermal design
considerations.
The thermal resistance of the 28-pin PLCC package is
typically 35.5 °C/W, which is representative of the natural airflow as seen in a typical switch cabinet with a
multilayer board.
The L9500 will enter thermal shutdown at a typical temperature of 150°C. The thermal design should ensure
that the SLIC does not reach this temperature under
normal operating conditions.
Thus, if the total power dissipated in the SLIC is less
than 1.83 W, it will not enter the thermal shutdown
state. Total SLIC power is calculated as:
Total PD = maximum battery • maximum current
limit + SLIC quiescent power.
For the L9500A, the worst-case SLIC on-hook active
power is 64 mW. Thus,
Total off-hook power = (ILOOP)(current-limit
tolerance) * (VBATAPPLIED) + SLIC on-hook power
Total off-hook power = (0.030 A)(1.08) * (21) +
75 mW
Total off-hook power = 744.4 mW
The power dissipated in the SLIC is the total power dissipation less the power that is dissipated in the loop.
SLIC PD = Total power – loop power
Loop off-hook power = (ILOOP * 1.08)2 • (RLOOP(dc)
min + 2RPROTECTION + RHANDSET)
Loop off-hook power = ((0.030 A)(1.08))2 • (20 Ω +
60 Ω + 200 Ω)
Loop off-hook power = 293.9 mW
SLIC off-hook power = Total off-hook power – loop
off-hook power
SLIC off-hook power = 744.4 mW – 293.9 mW
SLIC off-hook power = 450.5 mW < 1.83 W
Thus, under the worst-case normal operating conditions of this example, the thermal design, using the
auxiliary, is adequate to ensure the device is not driven
into thermal shutdown under worst-case operating conditions.
For this example, assume a maximum ambient operating temperature of 85 °C, a designed current limit of
30 mA, a maximum battery of –75 V, and an auxiliary
battery of –21 V. Assume a (worst-case) minimum dc
loop of 20 Ω of wire resistance, 30 Ω protection resistors, and 200 Ω for the handset. Additionally, include
the effects of parameter tolerance.
1. TTSD – TAMBIENT(max) = allowed thermal rise.
150°C – 85 °C = 65 °C.
2. Allowed thermal rise = package thermal
impedance • SLIC power dissipation.
65 °C = 35.5°C/W • SLIC power dissipation
SLIC power dissipation (PD) = 1.83 W.
Agere Systems Inc.
21
L9500A
High-Voltage Ringing SLIC for VoIP Applications
Preliminary Data Sheet
September 2001
Applications (continued)
On-Hook Transmission Mode
dc Loop Current Limit
If the magnitude of the primary battery is greater than
51 V, the magnitude of the open loop tip-to-ring open
loop voltage is clamped typically between 41 V and
49 V. If the magnitude of the primary battery is less
than a nominal 51 V, the overhead voltage will track the
magnitude of the battery voltage, i.e., the magnitude of
the open circuit tip-to-ring voltage will be 6 V to 8 V less
than battery. In the scan mode, overhead is unaffected
by VOVH.
Current limit may be chosen from two discrete values,
25 mA or 40 mA, depending on if VPROG is grounded
(25 mA) or left floating (40 mA). Note that there is a
12.5 kΩ slope to the I/V characteristic in the currentlimit region; thus, once in current limit, the actual loop
current will increase slightly, as loop length decreases.
The above describes the active mode steady-state current-limit response. There will be a transient response
of the current-limit circuit upon an on- to off-hook transition. Typical active mode transient current-limit
response is given in Table 19.
Table 19. Typical Active Mode On- to Off-Hook Tip/
Ring Current-Limit Transient Response
Parameter
dc Loop Current:
Active Mode
RLOOP = 100 Ω On- to Off-hook
Transition t < 5 ms
dc Loop Current:
Active Mode
RLOOP = 100 Ω On- to Off-hook
Transition t < 50 ms
dc Loop Current:
Active Mode
RLOOP = 100 Ω On- to Off-hook
Transition t < 300 ms
Value
Unit
ILIM + 60
mA
ILIM + 20
mA
ILIM
mA
Ring Mode
In the ring mode, to maximize ringing loop length, the
overhead is decreased to the saturation of the tip ring
drive amplifiers, a nominal 4 V. The tip to ground voltage is 1 V, and the ring to VBAT1 voltage is 3 V. In the
ring mode, overhead is unaffected by VOVH.
During the ring mode, to conserve power, the receive
input at RCVN/RCVP is deactivated. During the ring
mode, to conserve power, the ACC amplifier in the
transmit direction at VITR is deactivated. However, the
AX amplifier at VTX is active during the ring mode; differential ring current may be sensed at VTX during the
ring mode.
Loop Range
The dc loop range is calculated using:
V BAT2 – V OH
R L = ------------------------------------– 2RP – RDC
I LIMI T
Overhead Voltage
Active Mode
Overhead is fixed to a nominal 7.0 V, which is adequate
for an on-hook transmission of 3.14 dBm into 900 Ω
with additional head room for a 500 mV PPM signal.
VBAT2 is typically applied under off-hook conditions for
power conservation and SLIC thermal considerations.
The L9500 is intended for short-loop applications and,
therefore, will always be in current limit during off-hook
conditions. However, note that the ringing loop length
rather than the dc loop length will be the factor to determine operating loop length.
Scan Mode
If the magnitude of the primary battery is greater than
51 V, the magnitude of the open loop tip-to-ring open
loop voltage is clamped typically between 44 V and
51 V. If the magnitude of the primary battery is less
than a nominal 51 V, the overhead voltage will track the
magnitude of the battery voltage, i.e., the magnitude of
the open circuit tip-to-ring voltage will be 4 V to 6 V less
than battery. In the scan mode, overhead is unaffected
by VOVH.
22
Agere Systems Inc.
L9500A
High-Voltage Ringing SLIC for VoIP Applications
Preliminary Data Sheet
September 2001
Applications (continued)
Loop Closure
Battery Reversal Rate
The loop closure has a fixed typical 10.5 mA on- to offhook threshold in the active mode and a fixed 11.5 mA
on- to off-hook threshold from the scan mode. In either
case, there is a 2 mA hysteresis with VCC = 5 V and a
2 mA hysteresis with VCC = 3.3 V.
The rate of battery reverse is controlled or ramped by
capacitors FB1 and FB2. A chart showing FB1 and FB2
values vs. typical ramp time is given below. Leave FB1
and FB2 open if it is not desired to ramp the rate of battery reversal.
Table 20. FB1 and FB2 Values vs. Typical Ramp
Time
CFB1 and CFB2
Transition Time
0.01 µF
0.1 µF
0.22 µF
0.47 µF
1.0 µF
1.22 µF
1.3 µF
1.4 µF
1.6 µF
20 ms
220 ms
440 ms
900 ms
1.8 s
2.25 s
2.5 s
2.7 s
3.2 s
Ring Trip
The ring trip detector requires only a single-pole filter at
the input, minimizing external components. An R/C
combination of 383 kΩ and 0.1 µF, for a filter pole at
5.15 Hz, is recommended.
The ring trip threshold is internally fixed as a function of
battery voltage and is given by:
RT (mA) = 67 * {(0.0045 * VBAT1) + 0.317}
where:
RT is ring trip current in mA.
VBAT1 is the magnitude of the ring battery in V.
There is a 6 mA to 8 mA hysteresis.
Supervision
Ground Start
The L9500 offers the loop closure and ring trip supervision functions. Internal to the device, the outputs of
these detectors are multiplexed into a single package
output (NSTAT). The ring trip detector is valid on
NSTAT during the ring mode and loop closure detector
is valid on NSTAT during active and on-hook transmission modes. Additionally, common-mode current is
detected for ground start applications. This status is
output onto NSTAT and is valid during ground start
mode.
Agere Systems Inc.
In the ground start applications, the loop closure detector detector is also used to indicate that ring-ground
has occurred. During ground start mode, loop current
will be common mode, rather than differential as in loop
start mode. Thus, in ground start the threshold of the
loop closure detector is reduced by one half the threshold seen in the loop start mode.This ouput is seen at
the NSTAT output pin.
23
L9500A
High-Voltage Ringing SLIC for VoIP Applications
Applications (continued)
Sine Wave Input Signal and Sine Wave Power Ring
Signal Output
Power Ring
The device offers a ring mode, in which a balanced
power ring signal is provided to the tip/ring pair. During
the ring mode, a user-supplied low-voltage ring signal
is input to the device’s RINGIN input. This signal is
amplified to produce the balanced power ring signal.
The user may supply a sine wave input, PWM input, or
a square wave to produce sinusoidal or trapezoidal
ringing at tip and ring.
Various crest factors are shown below for illustrative
purposes.
80
VOLTS (V)
60
40
20
0
–20
–40
–60
–80
0.00 0.04 0.08 0.12 0.16 0.20
0.02 0.06 0.10 0.14 0.18
TIME (s)
12-3346a (F)
Note: Slew rate = 5.65 V/ms; trise = tfall = 23 ms; pwidth = 2 ms;
period = 50 ms.
Figure 9. Ringing Waveform Crest Factor = 1.6
80
60
VOLTS (V)
Preliminary Data Sheet
September 2001
40
20
0
–20
–40
–60
–80
0.00 0.04 0.08 0.12 0.16 0.20
0.02 0.06 0.10 0.14 0.18
TIME (s)
12-3347a (F)
The low-voltage sine wave input is applied differentially
or single ended to the L9500 at pins RINGINP and
RINGINN. During the ring mode, the signals at pins
RINGINP and RINGINN are amplified and presented to
the subscriber loop. The differential gain from RING IN
to tip and ring is a nominal 70.
When the device enters the ring mode, the tip/ring
overhead set at OVH and the scan clamp circuit are
disabled, allowing the voltage magnitude of the power
ring signal to be maximized. Additionally, in the ring
mode, the loop current limit is increased 2.5X the value
set by the VPROG voltage.
The magnitude of the power ring voltage will be a function of the gain of the ring amplifier, the high-voltage
battery, and the input signal at RING IN. The input range
of the signal at RINGIN is 0 V to Vcc. As the input voltage at RINGIN is increased, the magnitude of the power
ring voltage at tip and ring will increase linearly, per the
gain of 70, until the tip and ring drive amplifiers begin to
saturate. Once the tip and ring amplifiers reach saturation, further increases of the input signal will cause clipping distortion of the power ring signal at tip and ring.
The ring signal will appear balanced on tip and ring.
That is, the power ring signal is applied to both tip and
ring, with the signal on tip 180° out of phase from the
signal on ring.
It is recommended that the input level at RING IN be
adjusted so that the power ring signal at tip and ring is
just at the edge or slightly clipping. This gives maximum power transfer with minimal distortion of the sine
wave. The tip side will saturate at a nominal 1 V above
ground. The ring side will saturate at a nominal 3 V
above battery. The input circuit for a sine wave along
with waveforms to illustrate the tip and ring saturation
is shown in Figure 9.
The point at which clipping of the power ring signal
begins at tip and ring is a function of the battery voltage, the input capacitor at RINGIN, and the input signal
at RINGIN and Vcc. During nonring modes, the sinusoidal ringing waveform may be left on at RINGIN. Via the
state table, the ring signal will be removed from tip and
ring even if the low-voltage input is still present at
RINGIN.
Note: Slew rate = 10.83 V/ms; trise = tfall = 12 ms; pwidth = 13 ms;
period = 50 ms.
Figure 10. Ringing Waveform Crest Factor = 1.2
24
Agere Systems Inc.
L9500A
High-Voltage Ringing SLIC for VoIP Applications
Preliminary Data Sheet
September 2001
Applications (continued)
L9500
PT
GND
+1
1.0 V
VTIP
71 V
RINGINP
35x
VRING
3.0 V
VBAT
PR
–1
RINGINN
VBAT = –75 V
Figure 11. RINGIN Operation
ac Applications
ac Parameters
There are four key ac design parameters. Termination impedance is the impedance looking into the 2-wire port of
the line card. It is set to match the impedance of the telephone loop in order to minimize echo return to the telephone set. Transmit gain is measured from the 2-wire port to the PCM highway, while receive gain is done from
the PCM highway to the transmit port. Transmit and receive gains may be specified in terms of an actual gain, or in
terms of a transmission level point (TLP), that is the actual ac transmission level in dBm. Finally, the hybrid balance network cancels the unwanted amount of the receive signal that appears at the CODEC input.
Agere Systems Inc.
25
L9500A
High-Voltage Ringing SLIC for VoIP Applications
Preliminary Data Sheet
September 2001
ac Applications (continued)
Design Examples
Broadcom 3352 Interface Network
The following reference circuit shows the complete SLIC schematic for interface to the Broadcom BCM3352 as
designed on the Broadcom BCM93352SV application reference design and board.
VCC = 3.3 V
VBAT1
VBAT2
FERRITE BEAD
600 Ω
CCC
DBAT1
CBAT1
CBAT2
0.1 µF
0.1 µF
VBAT1
BGND
VBAT2
0.1 µF
AGND
C9
VCC
R3
VDDCORE
VDDI/O
CMLEVEL
VCM
CRT
0.1 µF
RRT
383 kΩ
C4
RTFLT
VREF_IO
R1
20 kΩ
C5
150 pF
VTXP
DCOUT
CC1
0.1 µF
FUSIBLE OR PTC
50 Ω
VBAT1
VTXN
C7
150 pF
R5
174 kΩ
C1
R6
88.7 kΩ
L9500
PT
3.3 nF
RCVP
FUSIBLE OR PTC
R4
78.7 kΩ
VPROG
R7
54.9 kΩ
R8
88.7 kΩ
VRXN
RCVN
VTX
BROADCOM
BCM3351
BCM3352
VRXP
BCM6352
BCM1101
C2
3.3 nF
VREF
TXI
CTX
0.47 µF
C6
150 pF
VITR
PR
AGERE
L7591
50 Ω
R2
20 kΩ
C3
3.3 nF
RGX
4750 Ω
RING REFN
RINGINN
ITR
C10
68 nF
RINGINP
CF1
CF2
NSTAT B2
CF1
0.22 µF
B1
B0
C9
68 nF
RING REFP
D0 D1 D2 DET
CF2
0.1 µF
RDET
10 kΩ
VCC
Figure 12. Reference Schematic with Broadcom BCM Embedded Codec Devices and Agere L9500 SLIC
26
Agere Systems Inc.
L9500A
High-Voltage Ringing SLIC for VoIP Applications
Preliminary Data Sheet
September 2001
ac Applications (continued)
Design Examples (continued)
Table 21. Parts List L9500; Agere L9500 and Broadcom BCM3352 (per Broadcom BCM93552SV Application
Board—SLIC Daughter Boad Components); Fully Programmable
Name
Value
Fault Protection
RPT
50 Ω
RPR
50 Ω
Protector
Agere L7591
Power Supply
CBAT1
0.1 µF
CBAT2
0.1 µF
DBAT1
1N4004
CCC
0.47 µF
Ferrite
600 Ω, Murata®
Bead
BLM11A601SPB
CF1
0.22 µF
CF2
0.1 µF
Ring Trip
CRT
0.1 µF
RRT
383 kΩ
ac Interface
RGX
4750 Ω
CTX
0.47 µF
CC1
0.1 µF
R4
78.7 kΩ
R5
174 kΩ
R6
88.7 kΩ
R7
54.9 kΩ
R8
88.7 kΩ
RDET
10 kΩ
Agere Systems Inc.
Tolerance
1%
1%
—
Rating
Function
Fusible or PTC Protection resistor.
Fusible or PTC Protection resistor.
—
Secondary protection.
20%
20%
—
20%
—
100 V
50 V
—
10 V
—
VBAT filter capacitor.
VBAT filter capacitor. |VBAT2| < |VBAT1|.
Reverse current.
Ceramic bypass capacitor.
Filtering.
20%
20%
100 V
100 V
Filter capacitor.
Filter capacitor.
20%
1%
10 V
1/16 W
Ring trip filter capacitor.
Ring trip filter resistor.
1%
20%
20%
1%
1%
1%
1%
1%
1%
1/16 W
10 V
10 V
1/16 W
1/16 W
1/16 W
1/16 W
1/16 W
1/16 W
Sets T/R to VITR transconductance.
ac/dc separation.
dc blocking capacitor.
ac interface.
ac interface.
ac interface.
ac interface.
ac interface.
Control.
27
L9500A
High-Voltage Ringing SLIC for VoIP Applications
Preliminary Data Sheet
September 2001
Outline Diagrams
28-Pin PLCC
Dimensions are in millimeters.
12.446 ± 0.127
11.506 ± 0.076
PIN #1 IDENTIFIER
ZONE
4
1
26
25
5
11.506
± 0.076
12.446
± 0.127
11
19
12
18
4.572
MAX
SEATING PLANE
1.27 TYP
0.51 MIN
TYP
0.10
0.330/0.533
5-2506r.8(F)
28
Agere Systems Inc.
L9500A
High-Voltage Ringing SLIC for VoIP Applications
Preliminary Data Sheet
September 2001
Outline Diagrams (continued)
48-Pin MLCC
Dimensions are in millimeters.
Notes: The dimensions in this outline diagram are intended for informational purposes only. For detailed schematics to assist your design efforts, please contact your Agere Sales Representative.
The exposed pad on the bottom of the package will be at VBAT1 potential.
C
7.00
C
CL
3.50
6.75
3.375
0.50 BSC
1
2
3
DETAIL A
VIEW FOR EVEN TERMINAL/SIDE
6.75
PIN #1
IDENTIFIER ZONE
7.00
0.18/0.30
0.00/0.05
SECTION C–C
DETAIL A
0.65/0.80
1.00 MAX
12°
SEATING PLANE
0.20 REF
0.08
0.01/0.05
11 SPACES @
0.50 = 5.50
0.24/0.60
0.18/0.30
0.24/0.60
5.10
± 0.15
3
2
1
0.30/0.45
EXPOSED PAD
0.50 BSC
0195mod
Agere Systems Inc.
29
L9500A
High-Voltage Ringing SLIC for VoIP Applications
Preliminary Data Sheet
September 2001
Outline Diagrams (continued)
48-Pin MLCC, JEDEC MO-220 VKKD-2
Dimensions are in millimeters.
Notes: The dimensions in this outline diagram are intended for informational purposes only. For detailed schematics to assist your design efforts, please contact your Agere Sales Representative.
The exposed pad on the bottom of the package will be at VBAT1 potential.
7.00
CL
3.50
PIN #1
IDENTIFIER ZONE
0.50 BSC
3.50
INDEX AREA
(7.00/2 x 7.00/2)
DETAIL A
VIEW FOR EVEN TERMINAL/SIDE
7.00
0.18
0.23
0.18
TOP VIEW
0.23
1.00 MAX
SEATING PLANE
0.20 REF
SIDE VIEW
0.08
DETAIL B
0.02/0.05
11 SPACES @
0.50 = 5.50
DETAIL A
0.18/0.30
0.30/0.50
2.50/2.625
5.00/5.25
3
2
1
EXPOSED PAD
0.50 BSC
DETAIL B
BOTTOM VIEW
0195a
30
Agere Systems Inc.
L9500A
High-Voltage Ringing SLIC for VoIP Applications
Preliminary Data Sheet
September 2001
Ordering Information
Device Part Number
Description
Package
Comcode
LUCL9500AGF-D
LUCL9500AGF-DT
LUCL9500ARG-D
SLIC
SLIC
SLIC
28-Pin PLCC, dry-bagged
28-Pin PLCC, dry-bagged, tape and reel
48-Pin MLF, dry-bagged
108955501
108955519
108955485
Agere Systems Inc.
31
Broadcom is a registered trademark of Broadcom Corporation.
IEEE is a registered trademark of The Institute of Electrical and Electronics Engineers, Inc.
Murata is a registered trademark of Murata Manufacturing Company LTD.
For additional information, contact your Agere Systems Account Manager or the following:
INTERNET:
http://www.agere.com
E-MAIL:
[email protected]
N. AMERICA: Agere Systems Inc., 555 Union Boulevard, Room 30L-15P-BA, Allentown, PA 18109-3286
1-800-372-2447, FAX 610-712-4106 (In CANADA: 1-800-553-2448, FAX 610-712-4106)
ASIA:
Agere Systems Hong Kong Ltd., Suites 3201 & 3210-12, 32/F, Tower 2, The Gateway, Harbour City, Kowloon
Tel. (852) 3129-2000, FAX (852) 3129-2020
CHINA: (86) 21-5047-1212 (Shanghai), (86) 10-6522-5566 (Beijing), (86) 755-695-7224 (Shenzhen)
JAPAN: (81) 3-5421-1600 (Tokyo), KOREA: (82) 2-767-1850 (Seoul), SINGAPORE: (65) 778-8833, TAIWAN: (886) 2-2725-5858 (Taipei)
EUROPE:
Tel. (44) 7000 624624, FAX (44) 1344 488 045
Agere Systems Inc. reserves the right to make changes to the product(s) or information contained herein without notice. No liability is assumed as a result of their use or application.
Copyright © 2001 Agere Systems Inc.
All Rights Reserved
September 2001
DS01-303ALC (Replaces DS01-081ALC)