AS2524 [AMSCO]
Telephone Line Interface and Speakerphone Circuit; 电话线接口和扬声器电路
| 型号： | AS2524 |
| 厂家： | 
AMS(艾迈斯) |
| 描述： | Telephone Line Interface and Speakerphone Circuit |
| 文件： | 总19页 (文件大小：342K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
austriamicrosystems
Telephone Line Interface and
Speakerphone Circuit
PRELIMINARY DATA SHEET
AS2523, AS2524, AS2524B
Key Features
General Description
-
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
AS2523/24 is a CMOS integrated circuit that incorporates
DC and AC line adaptation (DC-mask and synthesized AC-
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/b-
line 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.
-
-
-
-
-
-
-
-
-
-
-
-
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
Applications
Enhanced handsfree feature phones with CallerID and
extended displays. The AS2524 and AS2524B are
developed to interface with common Taiwanese dialers.
-
-
-
Side tone adaptation selectable by external components
Unique EMC performance
Package
Available in 28-pin SOIC or die
Operating range from 15mA to 100mA (down to 5mA
with reduced performance)
-
Few external components
Block Diagram
Revision 1.12, Preliminary
Page 1 of 19
Data Sheet AS2523, AS2524, AS2524B
austriamicrosystems
Pin description
Pin #
Symbol
Function
15
LS
Line Current Sense Input
Analog input for sensing the line current
12
13
9
LI
RI
Line Input
Analog input used for power extraction and line current sensing
Receive Input
Analog input for ac-separated receive signal
STB
CS
Side Tone Balance Input
Analog input for side tone cancellation network
10
Current Shunt Control Output
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
14
CI
Complex Impedance Input
Analog input pin for the capacitor to program a complex impedance
SS
Supply Source 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
18
19
8
VSS
VDD
AGND
M1
Voltage Source Source
Negative Analog Power Supply
Voltage Drain Drain
Positive Analog Power Supply
Analog Ground
Special ground for the internal amplifiers
Microphone Input 1
Differential input for the handset microphone (electret)
6
M2
Microphone Input 2
Differential input for the handset microphone (electret)
7
M3
Microphone Input 3
Differential input for the handsfree microphone (electret)
5
M4
Microphone Input 4
Differential input for the handsfree microphone (electret)
17
RO
Receive Output to Handset
Output for driving a dynamic earpiece with an impedance from 150Ω to 300Ω
Revision 1.12, Preliminary
Page 2 of 19
Data Sheet AS2523, AS2524, AS2524B
austriamicrosystems
Pin #
Symbol
Function
25
xCS
Chip Select on AS2523
Chip select input of the serial interface. Internal pull-up resistor ( 100kOhm )
/xMUTE Mute transmit-, receive- path and activate tone path on AS2524 and AS2524B
26
27
23
DI
Data Input on AS2523
Data input of the serial interface. Internal pull-up resistor ( 100kOhm )
/xPD
CLK
Power down mode for AS2524 and AS2524B (On-hook)
Clock on AS2523
Clock input of the serial interface. Internal pull-up resistor ( 100kOhm )
/HFE
LO
Handsfree mode operation on AS2524 and AS2524B
Loudspeaker Output. Output pin is for a 25Ω loudspeaker
2
3
FT1
TXO
TXV
CBN
RECI
Analog input pin for connecting a capacitor for offset cancellation.
Analog output of the transmit signal
4
Analog input for the transmit signal in the voice switching path
Analog input pin for connecting a capacitor for background noise monitoring.
1
20
Analog input for the handsfree receive path. Should be connected to RO via coupling
capacitor.
21
24
22
28
RECV
VSSA
VPP
Analog input for receive voice switching path.
Power supply pin for LO output amplifier.
Power supply pin for LO output amplifier.
TONEIN Analog input for DTMF-signals.
Revision 1.12, Preliminary
Page 3 of 19
Data Sheet AS2523, AS2524, AS2524B
austriamicrosystems
Detailed Block Diagram
Revision 1.12, Preliminary
Page 4 of 19
Data Sheet AS2523, AS2524, AS2524B
austriamicrosystems
The gain of the M3/M4 → LS is set to +46dB.
Functional Description
This gain can be changed by programming from +39dB to
+54dB in 1dB steps on AS2523. The input is differential
with an impedance of 10kΩ. The soft clip circuit limits the
output voltage at LS to 2Vp. There is no LLC for this path.
DC conditions
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
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 1Vp. It prevents harsh
distortion and acoustic shock. There is LLC for this path.
The DC characteristic is determined by the voltage at LI-
pin and a 30Ω resistor between LI- and LS-pin. It can be
calculated by the following equation: VLS = VLI + ILine *
30Ω. VLI can be programmed to be 3.5V or 4.5V.
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 1.1Vp. It prevents harsh distortion and acoustic
shock. There is optional LLC for this path.
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 AC-
impedance.
AC-impedance
The AC-impedance of AS2523/24 is set to t.m. 1000Ω.
With the external capacitor at CI-pin it can be programmed
complex. With an external resistor of approx. 1.5kΩ
connected to the LS-pin it can be programmed to 600Ω.
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.
Side Tone
A good side tone cancellation can be achieved by using the
following equation:
ZBAL/ZLINE = 10
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
Transmit path
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
impedance of 10kΩ. The soft clip circuit limits the output
voltage at LS to 2Vp. There is LLC for this path.
voice switching circuit
TX_atten
Voice
Backgnd
noise
monitor
speech
switching
RX
Revision 1.12, Preliminary
Page 5 of 19
Data Sheet AS2523, AS2524, AS2524B
austriamicrosystems
Gmax = +9dB
Gmin = -21dB … -40dB (Vol)
LINE
+23dB
+14dB
+8dB
~
+17dB
speech
Compress
Compress
Peak
detector
+3dB
Voice
switching
Peak
detector
Compress
Offset
comp
TXO
TXV
RO
FT1
0mV
~
100mV
CBN
Cmicoffset
Peak
CBckgnd
detector
RECV
RECI
Gmax = -4dB … +16dB (Vol)
Gmin = -33dB
+9dB
Speech
Mode
Rx-gain
Tx-gain
Remark
Rx > Tx_atten
Tx_atten > Rx
Tx_atten > Rx
X
Receive
Idle
0db to -20dB
-25
-50dB to -30dB
adjustable with VOL-setting
middle position
NO
YES
-25
Transmit
-50dB
0dB
independent of VOL-setting
IDLE-mode
RX-mode
TX-mode
0dB
-10dB
-20dB
TX-gain
Vol max
Vol default
Vol min
-25dB
-30dB
RX-gain
-40dB
-50dB
Revision 1.12, Preliminary
Page 6 of 19
Data Sheet AS2523, AS2524, AS2524B
austriamicrosystems
Typical Characteristics of Line Loss Compensation (AS2523, AS2524B only)
The line-loss-compensation is programmable at the AS2523, not activated at the AS2524 and LLC high (45mA-75mA) activated
at the AS2524B.
(dB) Tx Gain
No LLC (AS2523, AS2524)
35
34
LLC high
(AS2523,AS2524B)
LLC low
(AS2523)
33
32
31
30
29
f = 800 Hz
ZLINE = 600Ω
VLS = -10 dBm
DC Line
Current
20
30
40
50
60
70
80
(mA)
Figure 1 Typical Tx Gain Characteristics Line Loss Compensation
(dB) Rx Gain
No LLC (AS2523, AS2524)
+4
+3
+2
LLC low
(AS2523)
LLC high
(AS2523,AS2524B)
f = 800 Hz
ZLINE = 600Ω
VLS = -10 dBm
+1
0
-1
-2
VOL = 0 dB (neutral)
DC Line
Current
20
30
40
50
60
70
80
(mA)
Figure 2 Typical Rx Gain Characteristics Line Loss Compensation
Revision 1.12, Preliminary
Page 7 of 19
Data Sheet AS2523, AS2524, AS2524B
austriamicrosystems
Serial Interface on AS2523
Registers
The settings of the AS2523 are stored in 16 registers. Each
register has 4 bit data width.
Timing
The data format for writing to a register has the following form:
xCS
CLK
A3
A2
A1
A0
D3
D2
D1
D0
DI
Note:
The pins xCS,CLK,DI have internal pull-up resistors.
Parameter
Symbol
MIN
TYP
MAX
CLK Pulse width HIGH
CLK Pulse width LOW
T6
T5
T1
100ns
100ns
50ns
xCS to first falling CLK-
edge setup time
DIN to CLK setup time
DIN to CLK hold time
T3
T4
50ns
50ns
t5
t3
t6
t1
t4
xCS
CLK
DIN
Revision 1.12, Preliminary
Page 8 of 19
Data Sheet AS2523, AS2524, AS2524B
austriamicrosystems
Serial interface Registers
The following table shows the content of the 16 control registers.
Default value
after reset
Address
Data
Control registers AS2523
A A A A D D D D
for AS2523,
AS2524HF
for AS2524 LH bond
option
3
0
0
0
0
0
2
0
0
0
0
1
1
0
0
1
1
0
0
0
1
0
1
0
3
Nop
2
1
0
na
na
na
na
0111
na
na
na
na
0111
x
x
x
x
Conf-Tone:
0... No Conf Tone 1... Conf Tone
LIV: Voltage at pin LI
0...3.5V, 1...4.5V
LLC1 LLC0: Line loss compensation setting
0
0
1
1
0
1
0
1
20mA-50mA
NO Line loss compensation
45-75mA
NO Line loss compensation
0
1
0
1
0001
0001
BURS: Analog tone at RO
BURL: Analog tone at LS
0...OFF,
0...OFF,
1...ON
1...ON
CT1 CT0: @RO
@LS
0
0
1
1
0
1
0
1
-36dB -15dB
TONE-confidence level
rel. to pin LS
-30dB
-24dB
-18dB
-9dB
-3dB
+3dB
0
1
1
0
x
x
x
x
Softclip-settings, Tx_comp_gain settings
1000
1000
Bit1 Bit0 :Tx_comp_gain
0
0
1
1
0
1
0
1
+8dB
+11dB
+14dB
+17dB
SOFTRX: Softclip RX
SOFTTX: Softclip TX
0...OFF,
0...OFF,
1...ON
1...ON
0
1
1
1
0101
1100
Bit1 Bit0: Rx-offset setting
0
0
1
1
0
1
0
1
0mV
12mV
40mV
100mV
Delay_10ms
Bnon
0... no delay 1... 10ms delay
0... BGN off
1... BGN on
1
1
0
0
0
0
0
1
16 gains
Handsfree receive endgain
1111
0000
1011
1100
Data RXgain TXgain
0x0
:
-20dB
:
-30dB
Min. receive volume
Max. receive volume
0xF
+0dB
-50dB
x
x
x x
off1 off0: BGN-offset
0
0
1
1
0
1
0
1
120mV
180mV
240mV
300mV
Hfs1 HFs0: Speed of voice switching
0
0
1
1
0
1
0
1
max speed
min speed
1
1
0
0
1
1
0
1
16 gains
16 gains
Transmit gain [16], 16 steps, 1dB stepsize
0111
1111
0111
1111
Data HS-mode HF-mode
0x0
:
30dB
:
39dB
:
0xF
45dB
54dB
Receive gain [16], 16 steps, 1dB stepsize
Data HS-mode HF-mode
0x0
:
-6dB
:
19dB
:
0xF
+9dB
34dB
1
1
0
0
0100
0100
1000
0101
HP_on
rec_on
Mute
:
:
:
:
0... fg=200Hz
0... Rxcomp=AGND
0... No mute
1... fg=2000Hz
1... Rxcomp=RECV
1... Tx-path muted
Tone
0... Tx-signal path 1... Ton in signal path
1
1
0
1
x
x
x
x
Mask, Lh, Hf, Hook Switch
Mask:
0... No mask
1... Mask acitivated
His
0
1
1
1
HF
x
0
0
1
LH: Hook functions
x
0
1
0
1
Power down
Handset
not allowed
Handsfree
Loudhearing
1
1
1
1
1
1
1
1
0
1
x
x
x
x
0000
na
0001
na
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 1.12, Preliminary
Page 9 of 19
Data Sheet AS2523, AS2524, AS2524B
austriamicrosystems
Additional settings in Handsfree mode
Programming Guidelines for the AS2523
Note: change the default settings only if necessary:
The AS2523 is programmed by means of a serial 8-bit shift
register. MSB is clocked in first, LSB last.
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.
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.
b) Change the Tx comparator preamplifier gain in register 6
Default = 14dB
Each register has a default setting (see data sheet), which
is set after power-up of the chip.
c) Change the Receive DC offset and Background noise
monitoring in Register 7
The internal registers are RAM-cells. When the AS2523
loses VDD (as in on-hook state) it also loses the register
contents.
default = 0mV offset (higher val. puts more weight on Rx)
switching delay default = on
Background Noise Monitoring = on
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.
d) Set the speaker amplifier volume in register 8
Default = 0B
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)
Registers need to be re-written after each power-up and
after each hook event (handset / handsfree / on-hook).
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.
Additional settings during Flash
During a Flash, the AS2523 should be powered down to
avoid discharge of VDD:
Alternatively, all registers (4 to 16) may be re-written in a
bulk at each power-up and hook event (handset /
handsfree / on-hook).
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
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.
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.
Example of a typical power-up sequence
A typical power-up sequence will require the following
programming.
a) determine the cause of power-up (handset / handsfree
mode) and set register D accordingly.
Default = handset mode
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.
b) Set the LI voltage to 3.5V or 4.5V (default = 4.5V) and
Line Loss Compensation (default = off) in register 4
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.
c) Set the Confidence Tone level (e.g. the DTMF level
which is audible in the handset) and path in register 5
Default = off
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.
d) Set the required Tx and Rx gains in Registers A and B
Default = 37dB Tx gain, 1dB Rx gain
Revision 1.12, Preliminary
Page 10 of 19
Data Sheet AS2523, AS2524, AS2524B
austriamicrosystems
Parallel Interface on AS2524 and AS2524B
Input Signal on Pin
XPD
xMute
HF
0
Mode
Power down
Power down
Power down
Power down
Tone mode
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
1
0
1
0
1
Tone mode
0
Handset mode
Handsfree mode
1
Power down mode
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.
Handset mode
Speech mode is Handset mode (M1-M2, RO active; LO deactivated)
Parameter
LI Voltage
AS2524
4.5V
AS2524B
4.5V
LLC
No LLC
+37dB
+7.5dB
Off
LLC high (45mA to 75mA)
TX-Gain
RX-Gain
Rx-Softclip
Tx-Softclip
Tone
+43dB
+7.5dB
Off
Off
Off
Off
Off
Handsfree mode
Speech mode is Handsfree mode (M3-M4, RO active; LO active)
Parameter
LI Voltage
AS2524
4.5V
No LLC
+46dB
+34dB
Off
AS2524B
4.5V
LLC
LLC high (45mA to 75mA)
HF TX-Gain
HF RX-Gain
Rx-Softclip
Tx-Softclip
Tone
+52dB
+34dB
Off
Off
Off
Off
Off
BNM
On
On
Revision 1.12, Preliminary
Page 11 of 19
Data Sheet AS2523, AS2524, AS2524B
austriamicrosystems
Tone mode
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)
Parameter
LI Voltage
AS2524
4.5V
AS2524B
4.5V
LLC
No LLC
+14dB
LLC high (45mA to 75mA)
+14dB
Tone TX-Gain
Confidence tone
level
-36dB@Ro –15dB@Lo
relative to Pin LS
-36dB@Ro –15dB@Lo
relative to Pin LS
Loudhearing AS2524 and AS2524B (feature only available as DIE)
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”).
Parameter
AS2524
AS2524B
LI Voltage
LLC
4.5V
4.5V
No LLC
LLC high (45mA to 75mA)
TX-Gain
RX-Gain
Tone
+37dB
+43dB
+7.5dB
+7.5dB
Off
Off
Slow_rec
RECV pin
Highpass
On
Deactivated
On
Deactivated
2000kHz (10nF from TXO->TXV)
120ms/6dB
2000kHz (10nF from TXO->TXV)
120ms/6dB
Voice switching speed
RX-Offset
300mV
300mV
Electrical characteristics
Electrical characteristics are measured with the Test Circuit
application. Typical mean values will not be tested.
Absolute maximum ratings
Positive Supply Voltage
Input Current
-0.3V <= VDD <= 7V
+/- 25mA
-0.3V <= Vin <= 12V
-0.3V <= Vin <= 8V
-2V <= Vin <= VDD+0.3V
-0.3V <= Vin <= VDD+0.3V
+/- 1000V
Input Voltage (LS)
Input Voltage (LI, CS)
Input Voltage (STB, RI)
Digital Input Voltage
Electrostatic Discharge (HBM 1.5kΩ-100pF)
Storage Temperature
-65°C to +125°C
Recommended operating conditions
Supply Voltage (generated internally)
Operating Temperature
3V <= VDD <= 5V
-25°C to +70°C
Revision 1.12, Preliminary
Page 12 of 19
Data Sheet AS2523, AS2524, AS2524B
austriamicrosystems
DC characteristics
ILine=15mA w/o operation of any additional external
circuitry, unless other specified
Symbol
IDDS
IDDH
VLI
Parameter
Conditions
Speech Mode
Min
Type
Max
Units
Test
Operating Current
3
6
mA
Y
Operating Current
Handsfree Mode
7
10
mA
Y
Line Voltage LIVolt=0
Line Voltage LIVolt=1
15mA<=ILINE<=100mA
3.2
4.2
3.5
4.5
3.8
4.8
V
V
Y
Y
Output Current, Sink
CS,SS
IOL
VOL=0.4V
1
mA
N
Transmit characteristics
ILine=15mA f=800Hz, default settings unless other specified
Symbol
Parameter
Conditions
Min
Type
Max
Units
Test
AM1/2TX Transmit Gain M1/M2 → LS
ZAC(syn)=1000Ω
35
39
+36.5
+42.5
38
44
dB
dB
Y
Y
AS2524
AS2524B
AM3/4TX Transmit Gain M3/M4 → LS
ZAC(syn)=1000Ω
ZAC(syn)=1000Ω
43
49
+45.0
+51
47
53
dB
dB
Y
Y
AS2524
AS2524B
Transmit Gain
12
+14dB
16
dB
Y
Atone TX
Tone → LS
Variation with frequency
f = 500Hz … 3.4kHz
16 steps
±0.8
dB
N
N
∆ATX
Control range
-7/+8
dBr
AVRM12
M1/M2 → LS
Control range
16 steps
-7/+8
dBr
N
AVRM34
M2/M4 → LS
Distortion
2
%
Y
N
THD
VLS=0.25VRMS
Soft Clip Level
2
2
VP
VAGC1
M1/M2 → LS at LS
Soft Clip Level
VP
dB
N
N
VAGC2
ASCO
M3/M4 → LS at LS
Soft Clip Overdrive
M1/M2 - M3/M4
20
Attack time
Decay time
70
us/6dB
ms/6dB
N
N
tattack
tdecay
100
Revision 1.12, Preliminary
Page 13 of 19
Data Sheet AS2523, AS2524, AS2524B
austriamicrosystems
Symbol
Parameter
Input Impedance
Conditions
Min
Type
Max
Units
Test
10
N
ZIN-M1/2
kΩ
M1/M2
Input Impedance
M3/M4
10
±1
N
N
Y
ZIN-M3/4
VINmax
VNO
kΩ
Vp
Input Voltage Range
M1/2 - M3/4
differential
Noise Output Voltage
LS
-72
dBmp
TAMP=25°C
Handset mode
Gain = 36.5dB
Mute Attenuation
Mute activated
60
dB
Y
AMUTE
Receive characteristics
ILine=15mA f=800Hz, default settings unless other specified
Symbol
Parameter
Receive Gain
Conditions
Min
Type
Max
Units
Test
6
+7.5
9
dB
Y
Y
ARO
ZAC(syn)=1000Ω
LS → RO
Vol default
Receive Gain
+32.0
+34
+36.0
dB
ALO12
ZAC(syn)=1000Ω
Vol maximum
LS → LO
Variation with frequency
f=500Hz to 3.4kHz
16 steps
±0.8
dB
N
N
∆ARX
Control range
-7/+8
dBr
AVRRO
LS → RO
Control range
16 steps
-7/+8
dBr
N
AVRLS
LS → LO
Distortion LO
5
2
%
%
Y
Y
Y
N
THDLS
THDRO
VUFC
VLS=0.25VRMS
VLS =0.25VRMS
f = 200 … 20kHz
Distortion RO
Unwanted Freq. Cmp.
-60
dBm
VP
Soft Clip Level
RO
1
VAGCRO
Soft Clip Level
LO
1.1
10
VP
dB
N
N
VAGCLS
ASCLS
Soft Clip Overdrive
LO
Attack time
Decay time
70
us/6dB
ms/6dB
N
N
Tattack
Tdecay
100
Revision 1.12, Preliminary
Page 14 of 19
Data Sheet AS2523, AS2524, AS2524B
austriamicrosystems
Symbol
Parameter
Conditions
TAMP=25°C
Min
Type
Max
Units
Test
Noise Output Voltage
RO
-68
dBmp
Y
VNO
Gain = 7.5dB
Input Imp. RI
8
N
N
ZIN-RI
kΩ
Input Voltage Range RI
±2
Vp
VINmax
Input Imp. STB
80
±2
ZIN-STB
VINmax
kΩ
Input Volt. Range STB
Vp
Side tone
26
18
dB
Y
Y
ST
VRI<=0.25VRMS
Return Loss
dB
RL
ZAC(syn)=1000Ω
Temp. Variation
0.5
Ω/°C
∆ZAC/°C
Test circuit
U2
LS
RI
15
13
12
28
C6 100nF
C6 100nF
TONE IN
M3
C1 10uF
R1
30R
7
Vac
V3
Vac
C6 100nF
LI
D1
5
8
VSS
M4
M1
10V
R1
I1
Idc
R1
300R C2 1uF
C6 100nF
600R
9
STB
VSS
Vac
C6 100nF
R1
6k
6
M2
RO
Vac
10
16
CS
CI
17 C2 10uF
20 C4 100nF
R3
150R
VSS
VSS
VSS
VSS
AS2523/24
R4
10k
RECI
Q1
BC327
11
24
VSS
VSSA
21
C6 100nF
RECV
VSS
VSS
R5
10k
Q1
BC327
14
22
23 C7 100uF
SS
LO
R2
VSS
32R
25
26
27
VSS
xCS / xMUTE
DI / xPD
CLK / HFI
VPP
C2
47uF
3
2
1
1
CBN
VSS
C2
1uF
VSS
D1
5V1
C3
1n
VSS
Revision 1.12, Preliminary
Page 15 of 19
Data Sheet AS2523, AS2524, AS2524B
austriamicrosystems
Typical application AS2523
Revision 1.12, Preliminary
Page 16 of 19
Data Sheet AS2523, AS2524, AS2524B
austriamicrosystems
Typical application AS2524 and AS2524B
Revision 1.12, Preliminary
Page 17 of 19
Data Sheet AS2523, AS2524, AS2524B
austriamicrosystems
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
Packaging
28-pin plastic SOIC
For exact mechanical package dimensions please see
austriamicrosystemsAG packaging information.
Pin-out, Marking
CBN 1
FT1 2
TXO 3
TXV 4
M4 5
28 TONE IN
27 CLK / HFI
26 DI / xPD
25 xCS/ xMUTE
24 VSSA
23 LO
M2 6
M3 7
22 VPP
M1 8
21 RECV
20 RECI
19 AGND
18 VDD
STB 9
CS 10
VSS 11
LI 12
17 RO
application.
RI 13
16 CI
SS 14
15 LS
Copyright
Copyright © 1997-2002, austriamicrosystems AG, Schloss
Premstaetten, A8141 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.
YY
year of production
WW
AAA
calendar week of production
austriamicrosystemsAG assembly ID
X
3 … AS2523 Version
4 … AS2524 Version
4B .. AS2524B Version
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
Ordering Information
Number
Package
Description
AS2523 T
SOIC28
plastic surface mounted
package – 28 leads
Plastic surface mounted
package – 28 leads
Plastic surface mounted
package – 28 leads
Dice-on-Foil
AS2524 T
SOIC28
SOIC28
austriamicrosystems AG rendering of technical or other
services.
AS2524B T
AS2523 F
AS2524 F
AS2524B F
DOF
DOF
DOF
Dice-on-Foil
Dice-on-Foil
Revision 1.12, Preliminary
Page 18 of 19
Data Sheet AS2523, AS2524, AS2524B
austriamicrosystems
Contact
Headquarters
austriamicrosystems AG
Communications Business Unit
A8141 Schloss Premstaetten, Austria
T. +43 (0) 3136 500-0
F. +43 (0) 3136 500-5692
www.austriamicrosystems.com
Sales Offices
USA (east)
Germany
austriamicrosystems USA, Inc.
Suite 400, 8601 Six Forks Road
Raleigh, NC 27615, USA
Phone: +1/919/676 5292
Fax: +1/919/676 5305
austriamicrosystems Germany GmbH
Tegernseer Landstrasse 85
D-81539 München, Germany
Phone: +49/89/693643-0
Fax: +49/89/693643-66
United Kingdom
France
austriamicrosystems UK, Ltd.
Coliseum Business Centre, Watchmoor Park
Camberley, Surrey, GU15 3YL, UK
Phone: +44/1276/23 3 99
austriamicrosystems France S.a.r.l.
124, Avenue de Paris
F-94300 Vincennes, France
Phone: +33/1/43 74 00 90
Fax: +33/1/43 74 20 98
Fax: +44/1276/29 3 53
Japan
Italy
austriamicrosystems AG
austriamicrosystems Italy S.r.l.
Via Leone Tolstoi, 64
Shin Yokohama Daini, Center Bldg. 10F
3-19-5, Shin Yokohama
I-20146 Milano, Italy
Kohoku-ku, Yokohama 222-0033, Japan
Phone: +81/45/474 0962
Phone: +39/0242/36713
Fax: +39/0242/290889
Fax: +81/45/472 9845
Switzerland
austriamicrosystems Switzerland AG
Rietstrasse 4
Distributors & Representatives
austriamicrosystems AG is represented by distributors in
the following countries. Please contact your nearest
regional sales office for the distributor address:
CH-8640 Rapperswil, Switzerland
Phone: +41/55/220 9000
Fax: +41/55/220 9001
Spain, Israel, Korea, Hong-Kong, Taiwan, Malaysia,
Singapore, India, Brazil
USA (west)
austriamicrosystems USA, Inc.
Suite 116, 4030 Moorpark Ave,
San Jose, CA 95117, USA
Phone: +1/408/345 1790
Fax: +1/408/345 1795
Application Support
Please contact your local sales office or your distributor.
Revision 1.12, Preliminary
Page 19 of 19
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