ETC AM79M535-1JC

Am79M535
Metering Subscriber Line Interface Circuit
DISTINCTIVE CHARACTERISTICS
Programmable constant-current feed
Line-feed characteristics independent of
battery variations
Programmable loop-detect threshold
On-chip switching regulator for low-power
dissipation
Pin for external ground-key noise filter
capacitor available
Ground-key detect
Two-wire impedance set by single external
impedance
Performs polarity reversal
Tip Open state for ground-start lines
Supports 2.2 Vrms metering (12 and 16 kHz)
On-hook transmission
BLOCK DIAGRAM
Ring Relay Driver
RINGOUT
A(TIP)
C1
C2
Ground-Key
Detector
C3
Input Decoder
and Control
HPA
Two-Wire
Interface
E1
E0
DET
HPB
GKFIL
VTX
RSN
Signal Transmission
Off-Hook Detector
RD
Power-Feed
Controller
B(RING)
DA
DB
VREG
L
VBAT
RDC
Ring-Trip Detector
Switching Regulator
BGND
CHS
QBAT CHCLK
VCC
VEE
AGND
16856B-001
Notes:
1. Am79M535—E0 and E1 inputs; ring relay driver sourced internally to BGND; ground-key filter pin.
2. Current gain (K1) = 1000.
Publication# 080134 Rev: E Amendment: /0
Issue Date: October 1999
ORDERING INFORMATION
Standard Products
Legerity standard products are available in several packages and operating ranges. The order number (Valid Combination) is
formed by a combination of the elements below.
Am79M535
J
C
TEMPERATURE RANGE
C = Commercial (0°C to 70°C)*
PACKAGE TYPE
J = 32-Pin Plastic Leaded Chip Carrier (PL 032)
PERFORMANCE GRADE
Blank = Standard Specification
–1 = Performance Grading
–2 = Performance Grading
DEVICE NAME/DESCRIPTION
Am79M535
Subscriber Line Interface Circuit
Valid Combinations
Valid Combinations
Am79M535
–1
–2
JC
Valid Combinations list configurations planned to
be supported in volume for this device. Consult
the local Legerity sales office to confirm availability of specific valid combinations, to check on
newly released combinations, and to obtain additional data on Legerity’s standard military grade
products.
Note:
* Functionality of the device from 0°C to +70°C is guaranteed by production testing. Performance from –40°C to +85°C
is guaranteed by characterizations and periodic sampling of production units.
2
Am79M535 Data Sheet
BGND
2
1
DB
VREG
3
A(TIP)
VCC
4
B(RING)
RINGOUT
CONNECTION DIAGRAM
Top View
32 31 30
29
TP
GKFIL
6
28
DA
L
7
27
RD
VBAT
8
26
HPB
QBAT
9
25
HPA
CHS
10
24
VTX
CHCLK
11
23
VEE
RSVD
12
22
RSN
E1
13
21
AGND
DGND
19 20
C1
16 17 18
C3
DET
E0
14 15
RDC
5
C2
TP
Notes:
1. Pin 1 is marked for orientation.
2. TP is a thermal conduction pin tied to substrate (QBAT).
3. RSVD = Reserved. Do not connect to this pin.
SLIC Products
3
PIN DESCRIPTIONS
Pin Names
4
Type
Description
AGND
Gnd
Analog (quiet) ground
DGND
Gnd
Digital ground
A(TIP)
Output
Output of A(TIP) power amplifier
BGND
Gnd
Battery (power) ground
B(RING)
Output
Output of B(RING) power amplifier
C3–C1
Input
Decoder. TTL compatible. C3 is MSB and C1 is LSB.
CHCLK
Input
Chopper Clock. Input to switching regulator (TTL compatible). Freq = 256 kHz (Nominal).
CHS
Input
Chopper stabilization. Connection for external stabilization components.
DA
Input
Ring-trip negative. Negative input to ring-trip comparator
DB
Input
Ring-trip positive. Positive input to ring-trip comparator
DET
Output
Detector. When enabled, logic Low indicates that the selected detector is tripped. Logic
inputs C3–C1, E1, and E0 select the detector. Open-collector with a built-in 15 kΩ pullup resistor.
E0
Input
Read Enable. A logic Low disables DET. A logic High enables DET.
E1
Input
Ground-Key Enable. When E0 is High, E1 = High connects the ground-key detector to
DET, and E1 = Low connects the off-hook or ring-trip detector to DET.
GKFIL
Capacitor
Ground-Key Filter Capacitor Connection. An external capacitor for filtering out highfrequency noise from the ground-key loop can be connected to this pin. An internal
36 kΩ –20%, +40% resistor is provided to form an RC filter with the external capacitor.
In versions which have a GKFIL pin, a 3.3 nF minimum capacitance must be
connected from the GKFIL pin to ground.
HPA
Capacitor
High-Pass Filter Capacitor. A(TIP) side of high-pass filter capacitor.
HPB
Capacitor
High-Pass Filter Capacitor. B(RING) side of high-pass filter capacitor.
L
Output
Switching Regulator Power Transistor. Connection point for filter inductor and anode of
catch diode. Has up to 60 V of pulse waveform on it and must be isolated from sensitive
circuits. Keep the diode connections short because of the high currents and high di/dt
QBAT
Battery
Quiet Battery. Filtered battery supply for the signal processing circuits.
RD
Resistor
Detector resistor. Threshold modification and filter point for the off-hook detector.
RDC
Resistor
DC feed resistor. Connection point for the DC feed current programming network. The
other end of the network connects to the Receiver Summing Node (RSN). VRDC is
negative for normal polarity and positive for reverse polarity.
RINGOUT
Output
Ring Relay Driver. Sourcing from BGND with internal diode to QBAT.
RSN
Input
The metallic current (AC and DC) between A(TIP) and B(RING) is equal to 1000 x the
current into this pin. The networks that program receive gain, two-wire impedance, and
feed current all connect to this node. This node is extremely sensitive. Route the 256 kHz
chopper clock and switch lines away from the RSN node.
TP
Thermal
Thermal pin. Connection for heat dissipation. Internally connected to substrate (QBAT).
Leave as open circuit or connected to QBAT. In both cases, the TP pins can connect to
an area of copper on the board to enhance heat dissipation.
VBAT
Battery
Connected to office battery supply through an external protection diode.
VCC
Power
+5 V power supply
VEE
Power
–5 V power supply
VREG
Input
Regulated Voltage. Provides negative power supply for power amplifiers, connection
point for inductor, filter capacitor, and chopper stabilization.
VTX
Output
Transmit Audio. This output is 0.510 times the A(TIP) and B(RING) metallic voltage. VTX
also sources the two-wire input impedance programming network.
Am79M535 Data Sheet
ABSOLUTE MAXIMUM RATINGS
OPERATING RANGES
Storage temperature . . . . . . . . . . . . –55°C to +150°C
Commercial (C) Devices
VCC with respect to AGND/DGND . . .–0.4 V to +7.0 V
Ambient temperature . . . . . . . . . . . . . . 0°C to +70°C*
VEE with respect to AGND/DGND . . .+0.4 V to –7.0 V
VCC . . . . . . . . . . . . . . . . . . . . . . . . . . 4.75 V to 5.25 V
VBAT with respect to AGND/DGND . . . +0.4 V to –70 V
VEE . . . . . . . . . . . . . . . . . . . . . . . . –4.75 V to –5.25 V
Note: Rise time of VBAT (dv/dt) must be limited to 27 V/µs
or less when QBAT bypass = 0.33 µF.
VBAT . . . . . . . . . . . . . . . . . . . . . . . . . . . –40 V to –58 V
BGND with respect to
AGND/DGND . . . . . . . . . . . . . . . .+1.0 V to –3.0 V
A(TIP) or B(RING) to BGND:
Continuous . . . . . . . . . . . . . . . . . . –70 V to +1.0 V
10 ms (f = 0.1 Hz) . . . . . . . . . . . . –70 V to +5.0 V
1 µs (f = 0.1 Hz) . . . . . . . . . . . . . . . –90 V to +10 V
250 ns (f = 0.1 Hz) . . . . . . . . . . . .–120 V to +15 V
Current from A(TIP) or B(RING) . . . . . . . . . . . .±150 mA
Voltage on RINGOUT. . . . .BGND to 70 V above QBAT
Current through relay driver . . . . . . . . . . . . . . . 60 mA
AGND/DGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 V
BGND with respect to
AGND/DGND . . . . . . . . . . . –100 mV to +100 mV
Load resistance on VTX to ground . . . . . . . 10 kΩ min
Operating Ranges define those limits between which the
functionality of the device is guaranteed.
* Functionality of the device from 0°C to +70°C is guaranteed
by production testing. Performance from –40°C to +85°C is
guaranteed by characterizations and periodic sampling of
production units.
Voltage on ring-trip input
(DA and DB) . . . . . . . . . . . . . . . . . . . . . VBAT to 0 V
Current into ring-trip inputs . . . . . . . . . . . . . . . . .±10 mA
Peak current into regulator
switch (L pin) . . . . . . . . . . . . . . . . . . . . . . 150 mA
Switcher transient peak off
voltage on L pin . . . . . . . . . . . . . . . . . . . . . +1.0 V
C3–C1, E0, E1, CHCLK to
AGND/DGND . . . . . . . . . . .–0.4 V to VCC + 0.4 V
Maximum power dissipation, (see note). . . .TA = 70°C
In 32-pin PLCC package . . . . . . . . . . . . . . 1.74 W
Note: Thermal limiting circuitry on chip will shut down the
circuit at a junction temperature of about 165°C. The device should never be exposed to this temperature. Operation above 145°C junction temperature may degrade
device reliability. See the SLIC Packaging Considerations
for more information.
Stresses above those listed under Absolute Maximum Ratings
may cause permanent device failure. Functionality at or above
these limits is not implied. Exposure to Absolute Maximum
Ratings for extended periods may affect device reliability.
SLIC Products
5
ELECTRICAL CHARACTERISTICS
Description
Test Conditions (See Note 1)
Min
Analog (VTX ) output impedance
Analog (VTX ) output offset
Max
–1*
–1
–35
–30
–40
–35
300 Hz to 3.4 kHz
1
Longitudinal impedance at A or B
Unit
Note
Ω
4
+35
+30
+40
+35
mV
—
—
4
4
20
Ω
4
3
0°C to 70°C
–40°C to +85°C
Analog (RSN) input impedance
Typ
35
Overload level
4-wire
–3.1
+3.1
Z2WIN = 600 to 900 Ω
2-wire
–6.0
+6.0
Vpk
2
Transmission Performance, 2-Wire Impedance
2-wire return loss
(See Test Circuit D)
300 Hz to 500 Hz
500 Hz to 2500 Hz
2500 Hz to 3400 Hz
26
26
20
dB
4, 13
Longitudinal Balance (2-Wire and 4-Wire, See Test Circuit C)
RL = 600 Ω, Longitudinal to metallic
L-T, L-4 (normalized to unity gain)
300 Hz to 3400 Hz
Longitudinal to metallic L-T, L-4
Longitudinal signal generation 4-L
–1*
48
52
200 Hz to 1 kHz
normal polarity 0°C to +70°C
normal polarity –40°C to +85°C
reverse polarity
–2*
–2
–2
63
58
54
1 kHz to 3.4 kHz
normal polarity 0°C to +70°C
normal polarity –40°C to +85°C
reverse polarity
–2*
–2
–2
58
54
54
300 Hz to 800 Hz
300 Hz to 800 Hz
–1*
40
42
Longitudinal current capability per wire Active state
OHT state
dB
25
18
mArms
—
—
4
—
—
—
4
—
4
4
Insertion Loss (2- to 4-Wire and 4- to 2-Wire, See Test Circuits A and B)
Gain accuracy 2- to 4-wire
2- to 4-wire
2- to 4-wire
2- to 4-wire
0 dBm, 1 kHz,
0°C to +70°C
0 dBm, 1 kHz, –40°C to +85°C
0 dBm, 1 kHz,
0°C to +70°C
0 dBm, 1 kHz, –40°C to +85°C
Gain accuracy 4- to 2-wire
4- to 2-wire
4- to 2-wire
4- to 2-wire
0 dBm, 1 kHz,
0°C to +70°C
0 dBm, 1 kHz, –40°C to +85°C
0 dBm, 1 kHz,
0°C to +70°C
0 dBm, 1 kHz, –40°C to +85°C
Variation with frequency
300 Hz to 3400 Hz
Relative to 1 kHz
0°C to +70°C
–40°C to +85°C
–0.1
–0.15
+0.1
+0.15
—
—
—
4
+7 dBm to –55 dBm, ref 0 dBm
0°C to +70°C
–40°C to +85°C
–0.1
–0.15
+0.1
+0.15
—
—
4
Gain tracking
–1*
–1
5.75
5.65
5.75
5.70
–1*
–1
–0.15
–0.20
–0.1
–0.15
5.85
5.85
5.85
5.85
6.00
6.05
5.95
6.00
—
4
—
4
+0.15
+0.20
+0.1
+0.15
—
4
—
4
Notes:
* P.G. = Performance Grade
–2 grade performance parameters are equivalent to –1 performance parameters except where indicated.
6
Am79M535 Data Sheet
dB
ELECTRICAL CHARACTERISTICS (continued)
Description
Test Conditions (See Note 1)
Min
Typ
Max
–6.00
–6.05
–5.95
–6.00
–5.85
–5.85
–5.85
–5.85
–5.75
–5.65
–5.75
–5.70
Unit
Note
Balance Return Signal (4- to 4-Wire; See Test Circuit B)
Gain accuracy
Variation with frequency
Gain tracking
Group delay
0 dBm, 1 kHz,
0°C to +70°C
0 dBm, 1 kHz, –40°C to +85°C
0 dBm, 1 kHz,
0°C to +70°C
0 dBm, 1 kHz, –40°C to +85°C
–1*
–1
3
3, 4
3
3, 4
300 Hz to 3400 Hz
Relative to 1 kHz
0°C to +70°C
–40°C to +85°C
–0.10
–0.15
+0.10
+0.15
—
—
3, 4
3, 4
+7 dBm to –55 dBm, ref 0 dBm
0°C to +70°C
–40°C to +85°C
–0.10
–0.15
+0.10
+0.15
—
—
4
dB
f = 1 kHz
µs
5.3
4, 15
Total Harmonic Distortion (2- to 4-Wire or 4- to 2-Wire, See Test Circuits A and B)
Total harmonic distortion
0 dBm, 300 Hz to 3.4 kHz
+9 dBm, 300 Hz to 3.4 kHz
–64
–55
Total harmonic distortion with
metering
–50
–40
–35
dB
4, 10
Idle Channel Noise
C-message weighted noise
Psophometric weighted noise
Psophometric idle channel noise
with metering
2-wire,
2-wire,
2-wire,
0°C to +70°C
0°C to +70°C
–40°C to +85°C
–1*
+7
+7
+7
+15
+12
+15
4-wire,
4-wire,
4-wire,
0°C to +70°C
0°C to +70°C
–40°C to +85°C
–1*
+7
+7
+7
+15
+12
+15
2-wire,
2-wire,
2-wire,
0°C to +70°C
0°C to +70°C
–40°C to +85°C
–1*
–83
–83
–83
–75
–78
–75
4-wire,
4-wire,
4-wire,
0°C to +70°C
0°C to +70°C
–40°C to +85°C
–1*
–83
–83
–83
–75
–78
–75
2-wire
–46
4-wire
–52
dBrnC
—
—
4
—
—
4
7
—
4, 7
dBmp
7
—
4, 7
4, 11
Signal Frequency Out-of-Band Noise (See Test Circuit E)
Metallic
4 kHz to 9 kHz
9 kHz to 1 MHz
256 kHz and harmonics
–76
–76
–57
Longitudinal
1 kHz to 15 kHz
Above 15 kHz
256 kHz and harmonics
–70
–85
–57
dBm
4, 5, 9
4, 5, 9
4, 5
4, 5, 9
4, 5, 9
4, 5
DC Feed Currents (See Figure 1a, 1b, 1c) Battery = –48 V
Active state loop-current accuracy
ILOOP (nominal) = 40 mA
–7.5
OHT state
RL = 600 Ω
Tip Open state
RL = 600 Ω
1.0
Open Circuit state
RL = 0 Ω
1.0
Fault current limit, ILLIM (IAX + IBX)
A and B shorted to GND
130
18
SLIC Products
+7.5
20
%
22
mA
mA
7
ELECTRICAL CHARACTERISTICS (continued)
Description
Test Conditions (See Note 1)
Min
Typ
Max
–1*
35
35
120
80
–1*
135
135
250
200
–1*
200
200
400
300
Unit
Note
Power Dissipation Battery = –48 V, Normal Polarity
On-hook Open Circuit state
On-hook OHT state
On-hook Active state
Off-hook OHT state
RL = 600 Ω
500
750
Off-hook Active state
RL = 600 Ω
650
1000
VCC on-hook supply current
Open Circuit state
OHT state
Active state
3.0
6.0
7.5
4.5
10.0
12.0
VEE on-hook supply current
Open Circuit state
OHT state
Active state
1.0
2.2
2.7
2.3
3.5
6.0
VBAT on-hook supply current
Open Circuit state
OHT state
Active state
0.4
3.0
4.0
1.0
5.0
6.0
mW
Supply Currents
mA
Power Supply Rejection Ratio (VRIPPLE = 50 mVrms)
VCC
50 Hz to 3400 Hz
–1*
25
30
45
45
–1*
22
25
35
35
–1*
20
25
40
40
–1*
10
10
25
25
27
30
45
45
20
25
40
40
3.4 kHz to 50 kHz
VEE
50 Hz to 3400 Hz
3.4 kHz to 50 kHz
VBAT
50 Hz to 3400 Hz
–1
3.4 kHz to 50 kHz
–1*
dB
6, 7
Off-Hook Detector
Current threshold accuracy
IDET = 365/RD Nominal
–20
+20
%
10.0
kΩ
Ground-Key Detector Thresholds, Active state, Battery = –48 V (See Test Circuit F)
Ground-key resistance threshold
B(RING) to GND
Ground-key current threshold
B(RING) to GND
2.0
5.0
9
Midpoint to GND
9
mA
8
Ring-Trip Detector Input
Bias current
Offset voltage
Source resistance 0 to 2 MΩ
–5
–0.05
–50
0
µA
+50
mV
Logic Inputs (C4–C1, E0, E1, and CHCLK)
Input High voltage
2.0
Input Low voltage
0.80
Input High current
All inputs except E1
–75
40
Input High current
Input E1
–75
45
Input Low current
8
–0.40
Am79M535 Data Sheet
V
µA
mA
12
ELECTRICAL CHARACTERISTICS (continued)
Description
Test Conditions (See Note 1)
Min
Typ
Max
Unit
Note
Logic Output (DET)
Output Low voltage
IOUT = 0.8 mA
0.40
Output High voltage
IOUT = –0.1 mA
V
2.4
Relay Driver Outputs (RINGOUT)
On voltage
BGND
–2
50 mA source
BGND
–0.95
Off leakage
0.5
Clamp voltage
V
100
QBAT
–2
50 mA sink
µA
V
RELAY DRIVER SCHEMATIC
BGND
RINGOUT
16856B-002
QBAT
SWITCHING CHARACTERISTICS
Symbol
Parameter
Test Conditions
Temperatures
Ranges
Min
Typ
Max
0°C to +70°C
–40°C to +85°C
3.8
4.0
Ground-Key Detect state 0°C to +70°C
RL open, RG connected –40°C to +85°C
(See Figure H)
0°C to +70°C
–40°C to +85°C
1.1
1.6
0°C to +70°C
–40°C to +85°C
3.8
4.0
0°C to +70°C
–40°C to +85°C
1.2
1.7
0°C to +70°C
–40°C to +85°C
3.8
4.0
tshdd
E1 High to DET High (E0 = 1) Switchhook Detect state
RL = 600 Ω, RG open
E0 High to DET Low (E1 = 1) (See Figure G)
0°C to +70°C
–40°C to +85°C
1.1
1.6
tshd0
E0 Low to DET High (E1 = 1)
0°C to +70°C
–40°C to +85°C
3.8
4.0
E1 Low to DET High (E0 = 1)
Unit
Note
µs
4
tgkde
E1 Low to DET Low (E0 = 1)
tgkdd
E0 High to DET Low (E1 = 0)
tgkd0
E0 Low to DET High (E1 = 0)
E1 High to DET Low (E0 = 1)
1.1
1.6
tshde
SLIC Products
9
SWITCHING WAVEFORMS
E1 to DET
E1
DET
tgkde
tshde
tgkde
tshde
E0 to DET
E1
E0
DET
tshdd
tshd0
tgkdd
tgkd0
16856B-003
Note:
All delays measured at 1.4 V level.
10
Am79M535 Data Sheet
Notes:
1. Unless otherwise noted, test conditions are BAT = –48 V, VCC = +5 V, VEE = –5 V, RL = 600 Ω, CHP = 0.22 µF,
RDC1 = RDC2 = 31.25 kΩ, CDC = 0.1 µF, Rd = 51.1 kΩ, no fuse resistors, two-wire AC output impedance, programming
impedance (ZT) = 306 kΩ resistive, receive input summing impedance (ZRX) = 300 kΩ resistive. (See Table 2 for component
formulas.)
2. Overload level is defined when THD = 1%.
3. Balance return signal is the signal generated at VTX by VRX. This specification assumes that the two-wire AC load impedance
matches the impedance programmed by ZT.
4. Not tested in production. This parameter is guaranteed by characterization or correlation to other tests.
5. These tests are performed with a longitudinal impedance of 90 Ω and metallic impedance of 300 Ω for frequencies below
12 kHz and 135 Ω for frequencies greater than 12 kHz. These tests are extremely sensitive to circuit board layout.
6. This parameter is tested at 1 kHz in production. Performance at other frequencies is guaranteed by characterization.
7. When the SLIC is in the Anti-sat 2 operating region, this parameter is degraded. The exact degradation depends on system
design. The Anti-sat 2 region occurs at high loop resistances when VBAT – VAX – VBX is less than approximately 17 V.
8. “Midpoint” is defined as the connection point between two 300 Ω series resistors connected between A(TIP) and B(RING).
9. Fundamental and harmonics from 256 kHz switch-regulator chopper are not included.
10. Total harmonic distortion with metering as specified with a metering signal of 2.2 Vrms at the two-wire output, and a transmit
signal of +3 dBm or receive signal of –4 dBm. The transmit or receive signals are single-frequency inputs, and the distortion
is measured as the highest in-band harmonic at the two-wire or the four-wire output relative to the input signal.
11. Noise with metering is measured by applying a 2.2 Vrms metering signal (measured at the two-wire output) and measuring
the psophometric noise at the two-wire and four-wire outputs over a 200 ms time interval.
12. Tested with 0 Ω source impedance. 2 MΩ is specified for system design purposes only.
13. Assumes the following ZT network:
RSN
VTX
153 kΩ
153 kΩ
56 pF
14. Group delay can be considerably reduced by using a ZT network such as that shown in Note 13 above. The network reduces
the group delay to less than 2 µs. The effect of group delay on linecard performance may be compensated for by using the
QSLAC™ or DSLAC™ devices.
Table 1.
SLIC Decoding
DET Output
State
C3 C2 C1
Two-Wire Status
E0 = 1*
E1 = 0
E0 = 1*
E1 = 1
0
0
0
0
Open Circuit
Ring trip
Ring trip
1
0
0
1
Ringing
Ring trip
Ring trip
2
0
1
0
Active
Loop detector
Ground key
3
0
1
1
On-hook TX (OHT)
Loop detector
Ground key
4
1
0
0
Tip Open
Loop detector
—
5
1
0
1
Reserved
Loop detector
—
6
1
1
0
Active Polarity Reversal
Loop detector
Ground key
7
1
1
1
OHT Polarity Reversal
Loop detector
Ground key
Note:
* A logic Low on E0 disables the DET output into the open-collector state.
SLIC Products
11
Table 2. User-Programmable Components
Z T = 510 ( Z 2WIN – 2R F )
ZT is connected between the VTX and RSN pins. The fuse
resistors are RF, and Z2WIN is the desired 2-wire AC input
impedance. When computing ZT, the internal current amplifier
pole and any external stray capacitance between VTX and
RSN must be taken into account.
ZL
1000 • Z T
Z RX = ----------- • ------------------------------------------------G 42L Z T + 510 ( Z L + 2R F )
ZRX is connected from VRX to the RSN pin, ZT is defined
above, and G42L is the desired receive gain.
2500
R DCI + R DC2 = -----------I FEED
RDC1, RDC2, and CDC form the network connected to the
RDC pin. RDC1 and RDC2 are approximately equal.
R DC1 + R DC2
C DC = 1.5 ms • -------------------------------R DC1 • R DC2
ms
C D = 0.5
----------------RD
RD and CD form the network connected from RD to –5 V and
IT is the threshold current between on hook and off hook.
V MG
K1 ( ω ) • ZL • ZT
- • -----------------------------------------------------------------------Z M = -------------V M2W Z T + 0.51 • K 1 ( ω ) ( 2R F + Z L )
ZM is connected from VMG (metering source) to the RSN pin,
VM2W is the desired magnitude of the metering signal at the
2-wire output (usually 2.2 Vrms) and K1 ( ω ) is defined below.
365
R D = --------- ,
IT
1000
K 1 ( ω ) = -------------------------------------------------------------------------------------------------------------–9
1 + j ω ( 11.5 • 10 + CX ⁄ 2 ) ( 36 + Z L + 2R F )
where: CX = The values of the identical capacitors from
A and B to GND
ω = 2 π • metering frequency
12
Am79M535 Data Sheet
DC FEED CHARACTERISTICS
3
4
2
4
2
5
VBAT = 60 V
5
VBAT = 47.3 V
VBAT = 43 V
1
1
Active state
RDC = 62.5 kΩ
OHT state
Notes:
1.
Constant-current region:
Active state,
2500
I L = -----------R DC
OHT state,
1 2500
I L = --- -----------2 R DC
2. Anti-sat turn-on;
VAB = 1.02 |VBAT| – 14,
|VBAT| < 43.1 V (Anti-sat –2)
VAB = 29.95 V,
|VBAT| ≥ 43.1 V (Anti-sat –1)
VAB = 0.55 |VBAT| + 11.4,
|VBAT| ≤ 53 V (Anti-sat –2)
VAB = 40 V,
|VBAT| > 53 V (Anti-sat –1)
3. Open Circuit voltage;
4. Anti-sat –1 region
5. Anti-sat –2 region
a. VA–VB (VAB) Voltage vs. Loop Current (Typical)
SLIC Products
13
0
1000
2000
3000
4000
Load Resistance (Ω)
RDC = 62.5 kΩ
VBAT = 47.3 V
b. Loop Current vs. Load Resistance (Typical)
A
a
IL
RL
RSN
SLIC
RDC1
b
RDC2
B
CDC
RDC
Current programmed by RDC1 and RDC
c. Feed Programming
16856B-004
Figure 1. DC Feed Characteristics
14
Am79M535 Data Sheet
TEST CIRCUITS
VTX
A(TIP)
A(TIP)
VTX
RL
2
RT
SLIC
VL
SLIC
AGND
VAB
VAB
RT
RTMG
VMG
AGND
RL
RL
2
RRX
B(RING)
RSN
B(RING) RSN
RRX
VRX
IL4-2 = –20 log (VAB / VRX)
BRS = 20 log (VTX / VRX)
IL2-4 = –20 log (VTX / VAB)
A. Two- to Four-Wire Insertion Loss
B. Four- to Two-Wire Insertion Loss and Balance Return Signal
RL
2
VTX
A(TIP)
1/ωC << RL
RT
SLIC
C
S1
S1 Closed, S2 Open
L-T Long. Bal. = –20 log (VAB / VL)
L-4 Long. Bal. = –20 log (VTX / GTX • VL)
AGND
VL
S2 Closed, S1 Open
4-L Long. Sig. Gen. = –20 log (VL / VRX)
VL
S2
B(RING)
RRX
RSN
VRX
RL
2
C. Longitudinal Balance
ZD
A(TIP)
VTX
R
VS
RT
VM
Note:
ZD is the desired impedance (e.g., the characteristic impedance of the line.)
SLIC
R
RL = 20 log (2 VM / VS)
B(RING) RSN
ZIN
RRX
D. Two-Wire Return Loss Test Circuit
SLIC Products
15
TESTS CIRCUITS (continued)
RL
68 Ω
A(TIP)
C
A(TIP)
1/ωC << 90 Ω
SM
56 Ω
RL
IDC
B(RING)
SLIC
68 Ω
RG
C
SE
B(RING)
Current Feed and Ground Key
F. Ground-Key Detection
E. Single-Frequency Noise
VCC
6.2 kΩ
A(TIP)
A(TIP)
B(RING)
15 pF
RL = 600 Ω
E0
RG = 2 kΩ
B(RING)
G. Ground-Key Switching
16
DET
E1
H. Loop-Detector Switching
Am79M535 Data Sheet
PHYSICAL DIMENSIONS
PL032
.447
.453
.485
.495
.009
.015
.585
.595
.042
.056
.125
.140
Pin 1 I.D.
.080
.095
.547
.553
SEATING
PLANE
.400
REF.
.490
.530
.013
.021
.050 REF.
.026
.032
TOP VIEW
SIDE VIEW
16-038FPO-5
PL 032
DA79
6-28-94 ae
REVISION SUMMARY
Revision B to C
•
Minor changes were made to the data sheet style and format to conform to Legerity standards.
Revision C to D
•
•
In the Pin Description table, inserted/changed TP pin description to: “Thermal pin. Connection for heat
dissipation. Internally connected to substrate (QBAT). Leave as open circuit or connected to QBAT. In both
cases, the TP pins can connect to an area of copper on the board to enhance heat dissipation.”
Minor changes were made to the data sheet style and format to conform to Legerity standards.
Revision D to E
•
The physical dimensions (PL032) were added to the Physical Dimensions section.
•
Deleted the Ceramic DIP and Plastic DIP part (Am79M531) and references to it.
•
Updated the Pin Description table to correct inconsistencies.
SLIC Products
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© 1999 Legerity, Inc.
All rights reserved.
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Other product names used in this publication are for identification purposes only and may be trademarks of their respective companies.
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