AMSCO AS2524F

austriamicrosystems AG
is now
ams AG
The technical content of this austriamicrosystems datasheet is still valid.
Contact information:
Headquarters:
ams AG
Tobelbaderstrasse 30
8141 Unterpremstaetten, Austria
Tel: +43 (0) 3136 500 0
e-Mail: [email protected]
Please visit our website at www.ams.com
Telephone Line Interface and
Speakerphone Circuit
austriamicrosystems
AS2523, AS2524, AS2524B
-
impedance of 1000Ω) as well as a speech circuit with
softclipping, line loss compensation and Rx-volume control
for handset and handsfree operation. It shall act as an a/bline powered device, which is controlled by a CPU via a
serial interface on AS2523 or a standard dialler via a
parallel interface on AS2524 and AS2524B.
Applications
Enhanced handsfree feature phones with CallerID and
extended displays. The AS2524 and AS2524B are
developed to interface with common Taiwanese dialers.
Package
Available in 28-pin SOIC or die
Te
ch
ni
ca
Block Diagram
AS2523/24 is a CMOS integrated circuit that incorporates
DC and AC line adaptation (DC-mask and synthesized AC-
al
id
-
Line/Speakerphone circuit on a 28-pin CMOS-IC, simple
inventory: same die for AS2523/24 and AS2523/24B
Serial I/F on AS2523, parallel I/F on AS2524
Enhanced voice switching
Background noise monitoring
Tx- and Rx-gain programmable on AS2523 only
Digital volume control of Rx signals on AS2523 only
DC characteristic programmable on AS2523 only
Dual softclipping in handset mode on AS2523 only
Dual softclipping in handsfree mode on AS2523 only
Loudspeaker amplifier for loudhearing and handsfree
Supply voltage generation for external circuitry
Automatic line loss compensation on AS2523 / 24B only
Real and complex impedance selectable by external
components
Side tone adaptation selectable by external components
Unique EMC performance
Operating range from 15mA to 100mA (down to 5mA
with reduced performance)
Few external components
am
lc s
on A
te G
nt
st
il
-
General Description
lv
Key Features
DATA SHEET
Revision 1.13
Page 1 of 19
austriamicrosystems
Data Sheet AS2523, AS2524, AS2524B
Pin description
Pin #
Symbol
15
LS
Function
L ine Current S ense Input
Analog input for sensing the line current
LI
L ine I nput
al
id
12
Analog input used for power extraction and line current sensing
13
RI
R eceive I nput
9
STB
S ide T one B alance Input
Analog input for side tone cancellation network
CS
C urrent S hunt Control Output
am
lc s
on A
te G
nt
st
il
10
lv
Analog input for ac-separated receive signal
N-channel open drain output to control the external high power shunt transistor for
synthesizing AC- and DC-impedance, modulation of line voltage and shorting the line during
make periods of pulse dialing
16
CI
C omplex I mpedance Input
Analog input pin for the capacitor to program a complex impedance
14
SS
S upply S ource Control Output
N-channel open drain output to control the external high power source transistor for supplying
(Vpp) the loudspeaker amplifier in off-hook loudspeaking/handsfree mode
11
VSS
V oltage S ource S ource
Negative Analog Power Supply
18
VDD
V oltage D rain D rain
Positive Analog Power Supply
19
AGND
A nalog G round
8
M1
ca
Special ground for the internal amplifiers
M icrophone Input 1
6
ni
Differential input for the handset microphone (electret)
M2
M icrophone Input 2
ch
Differential input for the handset microphone (electret)
7
M3
M icrophone Input 3
Te
Differential input for the handsfree microphone (electret)
5
17
M4
M icrophone Input 4
Differential input for the handsfree microphone (electret)
RO
R eceive O utput to H andset
Output for driving a dynamic earpiece with an impedance from 150Ω to 300Ω
Revision 1.13
Page 2 of 19
austriamicrosystems
Data Sheet AS2523, AS2524, AS2524B
Pin #
Symbol
25
xCS
Function
C hip S elect on AS2523
Chip select input of the serial interface. Internal pull-up resistor ( 100kOhm )
/xMUTE
26
DI
Mute transmit-, receive- path and activate tone path on AS2524 and AS2524B
D ata I nput
on AS2523
27
/xPD
Power down mode for AS2524 and AS2524B (On-hook)
CLK
Cl oc k on AS2523
/HFE
Handsfree mode operation on AS2524 and AS2524B
23
LO
L oudspeaker O utput. Output pin is for a 25Ω
2
FT1
Analog input pin for connecting a capacitor for offset cancellation.
3
TXO
4
TXV
1
CBN
20
RECI
21
RECV
24
VSSA
22
VPP
28
TONEIN
am
lc s
on A
te G
nt
st
il
loudspeaker
lv
Clock input of the serial interface. Internal pull-up resistor ( 100kOhm )
al
id
Data input of the serial interface. Internal pull-up resistor ( 100kOhm )
Analog output of the transmit signal
Analog input for the transmit signal in the voice switching path
Analog input pin for connecting a capacitor for background noise monitoring.
Analog input for the handsfree receive path. Should be connected to RO via coupling
capacitor.
Analog input for receive voice switching path.
Power supply pin for LO output amplifier.
Power supply pin for LO output amplifier.
Te
ch
ni
ca
Analog input for DTMF-signals.
Revision 1.13
Page 3 of 19
Data Sheet AS2523, AS2524, AS2524B
austriamicrosystems
Te
ch
ni
ca
am
lc s
on A
te G
nt
st
il
lv
al
id
Detailed Block Diagram
Revision 1.13
Page 4 of 19
austriamicrosystems
Data Sheet AS2523, AS2524, AS2524B
Functional Description
The gain of the M3/M4 → LS is set to +46dB.
This gain can be changed by programming from +39dB to
+54dB in 1dB steps on AS2523. The input is differential
DC conditions
with an impedance of 10kΩ. The soft clip circuit limits the
output voltage at LS to 2V p . There is no LLC for this path.
The normal operating mode is from 15mA to 100mA. An
operating mode with reduced performance is from 5mA to
15mA. In the line hold range from 0mA to 5mA the device
is in a power down mode.
Receive path
al
id
The gain of the LS → RO receive path is set to +7.5dB.
This gain can be changed by programming from –7.5dB to
+7.5dB in 1dB steps (Register Rxgain). The receive input
is the differential signal of RI and STB. The soft clip circuit
limits the output voltage at RO to 1V p. It prevents harsh
distortion and acoustic shock. There is LLC for this path.
The DC characteristic is determined by the voltage at LIpin and a 30Ω resistor between LI- and LS-pin. It can be
calculated by the following equation: V LS = V LI + I Line *
30Ω. V LI can be programmed to be 3.5V or 4.5V.
lv
2/4 wire conversion
The gain of the LS → LO receive path is set to +32dB.
This gain can be changed by programming from +19dB to 34dB in 1dB steps. The user can also change the gain via
Register Handsfree receive end gain (See section
"Handsfree"). The receive input is the differential signal of
RI and STB. The soft clip circuit limits the output voltage at
LO to 1.1V p. It prevents harsh distortion and acoustic
shock. There is optional LLC for this path.
AC-impedance
am
lc s
on A
te G
nt
st
il
AS2523/24 has built in two Wheatstone bridges with one
common ground. This provides a maximum of
independence of AC-impedance and side tone from each
other. One can adapt side tone without changing the ACimpedance.
The AC-impedance of AS2523/24 is set to t.m. 1000Ω.
With the external capacitor at CI-pin it can be programmed
Line Loss Compensation (AS2523, AS2524B)
programmable on AS2523
- not activated at AS2524
- permanently activated at AS2524B
When it is activated, the transmit and receive gains for
both I/O’s are decreased by 6dB at line currents from
20mA to 50mA or from 45mA to 75mA.
complex. With an external resistor of approx. 1.5kΩ
-
connected to the LS-pin it can be programmed to 600Ω.
Side Tone
A good side tone cancellation can be achieved by using the
following equation:
Z BAL /Z LINE = 10
Transmit path
Handsfree
The handsfree function allows voice communication without
using the handset (full 2-way speaker phone). Two voice
controlled attenuators prevent acoustic coupling between
the loudspeaker and the microphone. The voice switching
circuit has three states, namely idle, transmit or receive. In
receive mode the attenuation of the receive path and the
transmit path can be controlled by Register Handsfree
receive end gain between 0dB and -20dB. The following
table shows how voice switching is controlled
ca
The gain of the M1/M2 → LS is set to +37dB. This gain
can be changed by programming on AS2523 from +30dB to
+45dB in 1dB steps (Register Txgain), on AS2524 / 24B it
is set to +37dB per default. The input is differential with an
Te
ch
ni
impedance of 10kΩ. The soft clip circuit limits the output
voltage at LS to 2V p. There is LLC for this path.
Revision 1.13
voice switching circuit
TX_atten
RX
Voice
switching
speech
Backgnd
noise
monitor
Page 5 of 19
austriamicrosystems
Data Sheet AS2523, AS2524, AS2524B
Gmax = +9dB
Gmin = -21dB … -40dB (Vol)
LINE
+23dB
+14dB
+8dB
~
+17dB
TXO
speech
Peak
detector
Voice
switching
TXV
RO
Compress
Compress
Offset
comp
FT1
0mV
~
100mV
Peak
detector
Peak
detector
CBN
Cmicoffset
CBckgnd
RECV
RECI
+9dB
am
lc s
on A
te G
nt
st
il
lv
Gmax = -4dB … +16dB (Vol)
Gmin = -33dB
al
id
Compress
+3dB
Rx > Tx_atten
Tx_atten > Rx
Tx_atten > Rx
Speech
Mode
Rx-gain
Tx-gain
Remark
X
Receive
0db to -20dB
-50dB to -30dB
adjustable with VOL-setting
NO
Idle
-25
-25
middle position
YES
Transmit
-50dB
0dB
independent of VOL-setting
IDLE-mode
RX-mode
TX-mode
0dB
-10dB
ca
TX-gain
Vol default
Vol min
-25dB
-30dB
-40dB
RX-gain
-50dB
Te
ch
ni
Vol max
-20dB
Revision 1.13
Page 6 of 19
austriamicrosystems
Data Sheet AS2523, AS2524, AS2524B
Typical Characteristics of Line Loss Compensation (AS2523, AS2524B only)
Tx Gain
35
34
33
32
31
30
29
No LLC (AS2523, AS2524)
LLC high
(AS2523,AS2524B)
LLC low
(AS2523)
lv
(dB)
al
id
The line-loss-compensation is programmable at the AS2523, not activated at the AS2524 and LLC high (45mA-75mA) activated
at the AS2524B.
f = 800 Hz
Z LINE = 600Ω
V LS = -10 dBm
am
lc s
on A
te G
nt
st
il
DC Line
Current
20
30
40
50
60
70
80
(mA)
Figure 1 Typical Tx Gain Characteristics Line Loss Compensation
(dB)
Rx Gain
+4
+3
+2
+1
0
-1
-2
No LLC (AS2523, AS2524)
LLC low
(AS2523)
LLC high
(AS2523,AS2524B)
f = 800 Hz
Z LINE = 600Ω
V LS = -10 dBm
VOL = 0 dB (neutral)
30
ca
20
DC Line
Current
40
50
60
70
80
(mA)
Te
ch
ni
Figure 2 Typical Rx Gain Characteristics Line Loss Compensation
Revision 1.13
Page 7 of 19
austriamicrosystems
Data Sheet AS2523, AS2524, AS2524B
Serial Interface on AS2523
Registers
The settings of the AS2523 are stored in 16 registers. Each
register has 4 bit data width.
Timing
al
id
The data format for writing to a register has the following form:
CLK
D2
D1
D0
am
lc s
on A
te G
nt
st
il
Note:
D3
A0
A1
A2
A3
DI
lv
xCS
The pins xCS,CLK,DI have internal pull-up resistors.
Parameter
Symbol
MIN
CLK Pulse width HIGH
T6
100ns
CLK Pulse width LOW
T5
100ns
xCS to first falling CLKedge setup time
T1
50ns
DIN to CLK setup time
T3
50ns
T4
50ns
DIN to CLK hold time
ca
t4
ch
CLK
t3
ni
xCS
MAX
t6
t5
t1
TYP
Te
DIN
Revision 1.13
Page 8 of 19
austriamicrosystems
Data Sheet AS2523, AS2524, AS2524B
Serial interface Registers
The following table shows the content of the 16 control registers.
Data
A A A A
3 2 1 0
D D D D
3 2 1 0
0
0
0
0
0
Nop
x
x
Conf-Tone:
0... No Conf Tone 1... Conf Tone
1 0 0 0
CT1
CT0
16 gains
x
x
x
0001
0001
Soft-TX
1000
1000
Bit1 Bit0 :Tx_comp_gain
0
0
+8dB
0
1
+11dB
1
0
+14dB
1
1
+17dB
SOFTRX: Softclip RX
0...OFF,
SOFTTX: Softclip TX
0...OFF,
0101
1100
1111
1011
0000
1100
Hfs1 HFs0: Speed of voice switching
0
0
max speed
0
1
1
0
1
1
min speed
Transmit gain [16], 16 steps, 1dB stepsize
0111
0111
Data HS-mode HF-mode
0x0
30dB
39dB
:
:
:
0xF
45dB
54dB
Receive gain [16], 16 steps, 1dB stepsize
1111
1111
0100
1000
0100
0101
0000
0001
na
na
1...ON
1...ON
Bit1 Bit0: Rx-offset setting
0
0
0mV
0
1
12mV
1
0
40mV
1
1
100mV
Delay_10ms
0... no delay
Bnon
0... BGN off
Handsfree receive endgain
Data
0x0
:
0xF
1 0 0 1
na
na
na
na
0111
BURS: Analog tone at RO
0...OFF,
1...ON
BURL: Analog tone at LS
0...OFF,
1...ON
CT1 CT0: @RO
@LS
0
0
-36dB -15dB
TONE-confidence level
0
1
-30dB
-9dB
rel. to pin LS
1
0
-24dB
-3dB
1
1
-18dB
+3dB
Softclip-settings, Tx_comp_gain settings
Bnon
Delay_10ms
Rxoffset Bit0
Rxoffset Bit1
0 1 1 1
na
na
na
na
0111
am
lc s
on A
te G
nt
st
il
Burl
x
Soft-RX
Burs
x
tx_comp_gain Bit0
x
tx_comp_gain Bit 1
x
for AS2524 LH bond
option
LIV: Voltage at pin LI
0...3.5V, 1...4.5V
LLC1 LLC0: Line loss compensation setting
0
0
20mA-50mA
0
1
NO Line loss compensation
1
0
45-75mA
1
1
NO Line loss compensation
0 1 0 1
0 1 1 0
for AS2523,
AS2524HF
lv
x
Llc0
x
Llc1
0
1
0
1
0
Liv
0
0
1
1
0
Conf
0
0
0
0
1
Default value
after reset
Control registers AS2523
al
id
Address
RXgain
-20dB
:
+0dB
TXgain
-30dB
1... 10ms delay
1... BGN on
Min. receive volume
-50dB
Max. receive volume
x
ca
Hfs0
Hfs1
16 gains
ni
1 0 1 0
off0
off1
off1 off0: BGN-offset
0
0
120mV
0
1
180mV
1
0
240mV
1
1
300mV
16 gains
ch
1 0 1 1
Tone
x
x
x
x
His
0
1
1
1
1
HF
x
0
0
1
1
LH:
x
0
1
0
1
fg=200Hz
Rxcomp=AGND
No mute
Tx-signal path
1...
1...
1...
1...
fg=2000Hz
Rxcomp=RECV
Tx-path muted
Ton in signal path
No mask
1... Mask acitivated
Hook functions
Power down
Handset
not allowed
Handsfree
Loudhearing
slow_rec
LH
Mute
Hf
Rec_on
x
His
HP_on
x
HP_on :
0...
rec_on :
0...
Mute
:
0...
Tone
:
0...
Mask, Lh, Hf, Hook Switch
Mask:
0...
Test2
1 1 1 1
x
HF-mode
19dB
:
34dB
Test3
1 1 1 0
x
Mask
1 1 0 1
HS-mode
-6dB
:
+9dB
Krat5
Te
1 1 0 0
Data
0x0
:
0xF
slow_rec: fast change to TX, slow change to RX, no IDLE
Krat5,Test3,Test2: For factory test only !
x
x
x
x
Reset to defaults
For a detailed description of the commands see Application note AN523/24.
Revision 1.13
Page 9 of 19
austriamicrosystems
Data Sheet AS2523, AS2524, AS2524B
Programming Guidelines for the AS2523
Additional settings in Handsfree mode
The AS2523 is programmed by means of a serial 8-bit shift
register. MSB is clocked in first, LSB last.
The first four bits (7,6,5,4) are the addresses of the
registers, the last four bits (3,2,1,0) are the data bits.
Note: change the default settings only if necessary:
Each register has a default setting (see data sheet), which
is set after power-up of the chip.
b) Change the Tx comparator preamplifier gain in register 6
Default = 14dB
The internal registers are RAM-cells. When the AS2523
loses VDD (as in on-hook state) it also loses the register
contents.
c) Change the Receive DC offset and Background noise
monitoring in Register 7
default = 0mV offset (higher val. puts more weight on Rx)
switching delay default = on
Background Noise Monitoring = on
al
id
e) Set the handsfree voice switching speed and
Background Noise monitoring offset in register 9:
default voice switching speed = 1ms/6dB (fastest)
default BGN monitoring offset = 240mV (determines the
Tx level required to switch from idle to Transmit)
am
lc s
on A
te G
nt
st
il
Registers need to be re-written after each power-up and
after each hook event (handset / handsfree / on-hook).
d) Set the speaker amplifier volume in register 8
Default = 0B
lv
It is therefore necessary to re-write the affected registers
after each hook event. The register contents cannot be
read, they can only be written.
a) A click-free startup can be achieved by starting up in
handset mode (=default) and then switching to
handsfree, once the chip has stabilized.
It is recommended to always initialize the chip with a “reset
to defaults command” (Fx) first and then write the
appropriate registers that need to be changed from the
default setting.
Alternatively, all registers (4 to 16) may be re-written in a
bulk at each power-up and hook event (handset /
handsfree / on-hook).
ca
This guarantees safe operation in case of unexpected loss
of power during normal operation. Re-writing all registers
also eases later software updates, as only register
contents need to be changed, but no additional command
lines need to be inserted.
Example of a typical power-up sequence
ni
A typical power-up sequence will require the following
programming.
ch
a) determine the cause of power-up (handset / handsfree
mode) and set register D accordingly.
Default = handset mode
Te
b) Set the LI voltage to 3.5V or 4.5V (default = 4.5V) and
Line Loss Compensation (default = off) in register 4
c) Set the Confidence Tone level (e.g. the DTMF level
which is audible in the handset) and path in register 5
Default = off
d) Set the required Tx and Rx gains in Registers A and B
Default = 37dB Tx gain, 1dB Rx gain
Revision 1.13
Additional settings during Flash
During a Flash, the AS2523 should be powered down to
avoid discharge of VDD:
Set the MASK bit (bit3 in register D) to 1
After the line current is restored, the MASK bit must be
cleared again. Other settings do not need to be re-written,
as VDD has not discharged. As a safety margin however, it
is recommended to re-write all registers after a flash
Additional settings during line breaks
If a line-break-detection (brief interruption of the line while
in off-hook state) is implemented, the same rules apply as
for a Flash: set the MASK bit to 1 to avoid discharge of
VDD. It is recommended to re-write all registers after a
line-break, as a line break may take long enough to
discharge VDD, even when the MASK bit was set.
General Rules
The serial interface may be programmed at any time, it
does not affect the speech quality, e.g. if a register is
overwritten with the same value.
It is also possible to re-write all registers periodically. The
register is static, therefore it can be clocked at any speed
up to 5MHz.
However, electromagnetic pulses on the clock and data
lines may cause unwanted programming of the chip. It is
therefore recommended to keep these lines short, filter
them by a discrete lowpass filter and reduce the clock
speed accordingly.
Page 10 of 19
austriamicrosystems
Data Sheet AS2523, AS2524, AS2524B
Parallel Interface on AS2524 and AS2524B
Input Signal on Pin
xMute
HF
0
0
0
Power down
Mode
0
0
1
Power down
0
1
0
Power down
0
1
1
Power down
1
0
0
Tone mode
1
0
1
Tone mode
1
1
0
Handset mode
1
1
1
Handsfree mode
al
id
XPD
lv
Power down mode
Handset mode
am
lc s
on A
te G
nt
st
il
For low power consumption the analog part is turned off during activated power down mode. The Power down mode is used
during Flash and Pulse dialing and for On-hook operation.
Speech mode is Handset mode (M1-M2, RO active; LO deactivated)
Parameter
LI Voltage
LLC
TX-Gain
RX-Gain
Rx-Softclip
Tx-Softclip
Tone
Handsfree mode
AS2524
AS2524B
4.5V
4.5V
No LLC
LLC high (45mA to 75mA)
+37dB
+43dB
+7.5dB
+7.5dB
Off
Off
Off
Off
Off
Off
Speech mode is Handsfree mode (M3-M4, RO active; LO active)
AS2524
AS2524B
4.5V
4.5V
No LLC
LLC high (45mA to 75mA)
+46dB
+52dB
HF RX-Gain
+34dB
+34dB
Rx-Softclip
Off
Off
Tx-Softclip
Off
Off
Tone
Off
Off
On
On
LI Voltage
LLC
Te
ch
ni
HF TX-Gain
ca
Parameter
BNM
Revision 1.13
Page 11 of 19
austriamicrosystems
Data Sheet AS2523, AS2524, AS2524B
Tone mode
Parameter
AS2524
AS2524B
4.5V
4.5V
LLC
No LLC
LLC high (45mA to 75mA)
Tone TX-Gain
+14dB
+14dB
[email protected] [email protected]
relative to Pin LS
[email protected] [email protected]
relative to Pin LS
LI Voltage
Confidence tone
level
al
id
This mode is used to send DTMF and FSK data to the line.
Speech mode is Tone mode (M1-M2;M3-M4 muted, Rx path muted, RO and LO active)
Loudhearing AS2524 and AS2524B (feature only available as DIE)
LI Voltage
LLC
TX-Gain
RX-Gain
Tone
Slow_rec
RECV pin
Highpass
Voice switching speed
RX-Offset
AS2524
AS2524B
am
lc s
on A
te G
nt
st
il
Parameter
lv
Speech mode is Loudhearing (M3-M4, RO active; LO activated).
Loudhearing can be activated via a bond-option (see document “AS2523/24 Delivery as Dice”).
4.5V
4.5V
No LLC
LLC high (45mA to 75mA)
+37dB
+43dB
+7.5dB
+7.5dB
Off
Off
On
On
Deactivated
Deactivated
2000kHz (10nF from TXO->TXV)
2000kHz (10nF from TXO->TXV)
120ms/6dB
120ms/6dB
300mV
300mV
Electrical characteristics
ca
Electrical characteristics are measured with the Test Circuit
application. Typical mean values will not be tested.
Absolute maximum ratings
ni
Positive Supply Voltage
Input Current
ch
Input Voltage (LS)
Input Voltage (LI, CS)
Input Voltage (STB, RI)
Te
Digital Input Voltage
Electrostatic Discharge (HBM 1.5kΩ-100pF)
Storage Temperature
-0.3V <= V DD <= 7V
+/- 25mA
-0.3V <= V in <= 12V
-0.3V <= V in <= 8V
-2V <= V in <= V DD +0.3V
-0.3V <= V in <= V DD +0.3V
+/- 1000V
-65°C to +125°C
Recommended operating conditions
Supply Voltage (generated internally)
Operating Temperature
Revision 1.13
3V <= V DD <= 5V
-25°C to +70°C
Page 12 of 19
austriamicrosystems
Data Sheet AS2523, AS2524, AS2524B
DC characteristics
I Line =15mA w/o operation of any additional external
circuitry, unless other specified
Parameter
Conditions
Min
Type
Max
Units
Test
Y
Operating Current
Speech Mode
3
6
mA
I DDH
Operating Current
Handsfree Mode
7
10
mA
V LI
Line Voltage LIVolt=0
Line Voltage LIVolt=1
15mA<=ILINE<=100mA
3.5
4.5
3.8
4.8
V
V
I OL
Output Current, Sink
CS,SS
3.2
4.2
Y
Y
1
mA
N
am
lc s
on A
te G
nt
st
il
VOL=0.4V
Y
lv
I DDS
al
id
Symbol
Transmit characteristics
I Line =15mA f=800Hz, default settings unless other specified
Symbol
Parameter
Conditions
Min
Type
Max
Units
Test
35
39
+36.5
+42.5
38
44
dB
dB
Y
Y
43
49
+45.0
+51
47
53
dB
dB
Y
Y
12
+14dB
16
dB
Y
A M1/2TX
Transmit Gain M1/M2 → LS
AS2524
AS2524B
Z AC(syn)= 1000Ω
A M3/4TX
Transmit Gain M3/M4 → LS
AS2524
AS2524B
Z AC(syn) =1000Ω
A tone TX
Transmit Gain
Z AC(syn) =1000Ω
∆ A TX
Variation with frequency
f = 500Hz … 3.4kHz
±0.8
dB
N
A VRM12
Control range
16 steps
-7/+8
dBr
N
16 steps
-7/+8
dBr
N
%
Y
2
VP
N
2
VP
N
ca
Tone → LS
M1/M2 → LS
M2/M4 → LS
Distortion
ch
THD
Control range
ni
A VRM34
V AGC1
Soft Clip Level
V LS =0.25VRMS
2
Te
M1/M2 → LS at LS
V AGC2
Soft Clip Level
A SCO
Soft Clip Overdrive
M1/M2 - M3/M4
20
dB
N
t attack
Attack time
70
us/6dB
N
t decay
Decay time
100
ms/6dB
N
Revision 1.13
M3/M4 → LS at LS
Page 13 of 19
austriamicrosystems
Data Sheet AS2523, AS2524, AS2524B
Symbol
Parameter
Conditions
Min
Type
Max
Units
Test
Input Impedance
M1/M2
10
kΩ
N
Z IN-M3/4
Input Impedance
M3/M4
10
kΩ
N
V INmax
Input Voltage Range
M1/2 - M3/4
differential
±1
Vp
N
V NO
Noise Output Voltage
LS
T AMP =25°C
dBmp
dBmp
-66
Mute activated
N
Y
lv
Mute Attenuation
-72
60
dB
am
lc s
on A
te G
nt
st
il
A MUTE
Handset mode
Gain = 36.5dB
Gain = 42.5dB
al
id
Z IN-M1/2
Y
Receive characteristics
I Line =15mA f=800Hz, default settings unless other specified
Symbol
A RO
Parameter
Conditions
Receive Gain
Z AC(syn) =1000Ω
LS → RO
Vol default
Type
Max
Units
Test
6
+7.5
9
dB
Y
+32.0
+34
+36.0
dB
Y
A LO12
Receive Gain
∆ A RX
Variation with frequency
f=500Hz to 3.4kHz
±0.8
dB
N
A VRRO
Control range
16 steps
-7/+8
dBr
N
16 steps
-7/+8
dBr
N
LS → LO
LS → RO
Z AC(syn) =1000Ω
Vol maximum
Min
Control range
THD LS
Distortion LO
V LS =0.25VRMS
5
%
Y
Distortion RO
V LS =0.25VRMS
2
%
Y
Unwanted Freq. Cmp.
f = 200 … 20kHz
-60
dBm
Y
1
VP
N
ch
V UFC
LS → LO
ni
THD RO
ca
A VRLS
V AGCRO Soft Clip Level
Te
RO
V AGCLS
Soft Clip Level
LO
1.1
VP
N
A SCLS
Soft Clip Overdrive
LO
10
dB
N
T attack
Attack time
70
us/6dB
N
T decay
Decay time
100
ms/6dB
N
Revision 1.13
Page 14 of 19
austriamicrosystems
Data Sheet AS2523, AS2524, AS2524B
Symbol
V NO
Parameter
Conditions
Min
Type
T AMP =25°C
Noise Output Voltage
RO
Max
Units
Test
-68
dBmp
Y
Gain = 7.5dB
Input Imp. RI
Input Voltage Range RI
8
±2
kΩ
Vp
N
Z IN-STB
V INmax
Input Imp. STB
Input Volt. Range STB
80
±2
kΩ
Vp
N
ST
Side tone
V RI <=0.25VRMS
26
RL
∆ Z AC/°C
Return Loss
Temp. Variation
Z AC(syn) =1000Ω
18
dB
dB
0.5
al
id
Z IN-RI
V INmax
Y
Y
Test circuit
am
lc s
on A
te G
nt
st
il
lv
Ω/°C
U2
15
I1
10 0u F
C2
C1
R1
30R
13
12
D1
10V
R1
300R
R1
600R
Idc
10uF
VSS
TONE IN
RI
M3
LI
M4
C2
1uF
9
VSS
Vac
LS
R1
6k
10
VSS
16
VSS
Q1
BC327
11
24
VSS
M1
28
C6
100nF
7
C6
100nF
5
C6
Vac
100nF
8
C6
100nF
6
C6
Vac
100nF
STB
M2
CS
RO
CI
AS2523/24
VSS
VSSA
RECI
RECV
Vac
V3
17
C2
10uF
20
C4
100nF
21
C6
VSS
R3
R4
10k
Q1
14
22
C2
47uF
LO
SS
R5
10k
VSS
VSS
3
2
1
1
C2
1uF
TX V
TX O
FT 1
VD D
25
26
27
100uF
R2
32R
VSS
4
3
1u F 2
C2
22 uF 19
C2
18
10 0u F
C2
ca
C7
C3
1n
VSS
Te
ch
D1
5V1
AG ND
CBN
VSS
ni
xCS / xMUTE
DI / xPD
CLK / HFI
VPP
23
VSS
100nF
VSS
BC327
150R
Revision 1.13
Page 15 of 19
Data Sheet AS2523, AS2524, AS2524B
austriamicrosystems
Te
ch
ni
ca
am
lc s
on A
te G
nt
st
il
lv
al
id
Typical application AS2523
Revision 1.13
Page 16 of 19
Data Sheet AS2523, AS2524, AS2524B
austriamicrosystems
Te
ch
ni
ca
am
lc s
on A
te G
nt
st
il
lv
al
id
Typical application AS2524 and AS2524B
Revision 1.13
Page 17 of 19
austriamicrosystems
Data Sheet AS2523, AS2524, AS2524B
Packaging
28-pin plastic SOIC
For exact mechanical package dimensions please see austriamicrosystems AG packaging information.
am
lc s
on A
te G
nt
st
il
lv
al
id
Pin-out, Marking
YY
WW
AAA
year of production
calendar week of production
austriamicrosystems AG assembly ID
X
3 … AS2523 Version
4 … AS2524 Version
4B .. AS2524B Version
Ordering Information
Package
Description
AS2523 T
SOIC28
plastic surface mounted
package – 28 leads
AS2524 T
SOIC28
Plastic surface mounted
package – 28 leads
AS2524B T
SOIC28
Plastic surface mounted
package – 28 leads
AS2524 F
ni
AS2523 F
ca
Number
Dice-on-Foil
DOF
Dice-on-Foil
DOF
Dice-on-Foil
Te
ch
AS2524B F
DOF
Revision 1.13
Page 18 of 19
austriamicrosystems
Data Sheet AS2523, AS2524, AS2524B
Copyright
Copyright © 2002-2007, austriamicrosystems AG, Schloss Premstaetten, 8141 Unterpremstaetten, Austria-Europe. Trademarks
Registered ®. All rights reserved. The material herein may not be reproduced, adapted, merged, translated, stored, or used
without the prior written consent of the copyright owner.
al
id
All products and companies mentioned are trademarks of their respective companies.
Disclaimer
am
lc s
on A
te G
nt
st
il
lv
Devices sold by austriamicrosystems AG are covered by the warranty and patent identification provisions appearing in its Term
of Sale. austriamicrosystems AG makes no warranty, express, statutory, implied, or by description regarding the information set
forth herein or regarding the freedom of the described devices from patent infringement. austriamicrosystems AG reserves the
right to change specifications and prices at any time and without notice. Therefore, prior to designing this product into a system,
it is necessary to check with austriamicrosystems AG for current information. This product is intended for use in normal
commercial applications. Applications requiring extended temperature range, unusual environmental requirements, or high
reliability applications, such as military, medical life-support or life-sustaining equipment are specifically not recommended
without additional processing by austriamicrosystems AG for each application.
The information furnished here by austriamicrosystems AG is believed to be correct and accurate. However,
austriamicrosystems AG shall not be liable to recipient or any third party for any damages, including but not limited to personal
injury, property damage, loss of profits, loss of use, interruption of business or indirect, special, incidental or consequential
damages, of any kind, in connection with or arising out of the furnishing, performance or use of the technical data herein. No
obligation or liability to recipient or any third party shall arise or flow out of austriamicrosystems AG rendering of technical or
other services.
Contact Information
Headquarters:
ch
ni
ca
austriamicrosystems AG
Business Unit Communications
A 8141 Schloss Premstätten, Austria
T. +43 (0) 3136 500 0
F. +43 (0) 3136 5692
[email protected]
Te
For Sales Offices, Distributors and Representatives, please visit:
www.austriamicrosystems.com
austriamicrosystems
Revision 1.13
– a leap ahead
Page 19 of 19