AM79C32A Advanced Micro Devices, AM79C32A Datasheet - Page 71

• Manufacturer Part Number: AM79C32A
• Description: Digital Subscriber Controller (DSC) Circuit
• Manufacturer: Advanced Micro Devices

Transmitter 0-dB Reference Point:
Nominal input voltage at AINA or AINB will produce a 0-dBm, 1-kHz digital code at the transmit output with all transmit gains at
0 dB.
Receiver 0-dB Reference Point:
Nominal input voltage between EAR1/EAR2 or LS1/LS2 resulting from a 0-dBm, 1-kHz digital code at the receive input with all
receive gains at 0 dB.
Notes:
The following test conditions apply to all MAP tests:
1. An external 1-Kohm ± 5% resistor and 2200-pF ±10% capacitor are connected in series between the CAP1 and CAP2 pins
2. All tests are half-channel with the sidetone path enabled but programmed for infinite attentuation (STG = 9008 hex).
3. Transmit specs are guaranteed for both AINA and AINB inputs with the auto-zero and high-pass filters enabled in MMR2.
4. Transmit specs are tested and guaranteed with the input signal source referenced to AREF; see test circuit below.
5. Receive specs are guaranteed for both EAR1/EAR2 and LS1/LS2 outputs measured differentially. Some degradation in
Parameter
A law = 625 mV rms
µ law = 620 mV rms
A law = 1.25 mV rms
µ law = 1.2 mV rms
Symbol
RXSTD
TXSTD
RXICN
TXICN
RXGE
RXGT
RXGL
TXGT
TXG
for all transmit tests.
performance may occur if used single ended rather than differential.
Parameter Descriptions
Transmit absolute gain
Receive absolute gain at EAR1/EAR2
(nominal)
Receive absolute gain
Transmit signal/total distortion; CCITT method
2, 1020 Hz (Tx gain = 0)
Receive signal/total distortion; CITT method 2,
1020 Hz (Rx gain = 0)
Transmit gain tracking; CCITT method 2, 1020
Hz (Tx gain = 0)
Receive gain tracking; CCITT method 2, 1020
Hz (Rx gain = 0)
Transmit Idle channel Noise AINA connected to
AREF
Receive Idle channel Noise
Table 54. Codec Performance Specifications (Am79C30A only)
Transmit Test Circuit with Input Source Referenced to AREF
Am79C30A/32A Data Sheet
~
0.1 µF
Test Conditions
0 dBm0; 1020 Hz; V
= 0°C–70°C; over all GA
0 dBm0; 1020 Hz; V
= 0°C–70°C; Rload = 540 ohms
0 dBm0; 1020 Hz; V
0°C–70°C; Rload = 40 ohms
–10 dBm0
–45 dBm0
–10 dBm0
–45 dBm0
–45
–45
GX = 6 dB, GA = 18 dB
GR = –12 dB, GER = 0 dB
100K
AINA or AINB
AREF
CC
CC
CC
= 5 V ±5%; TA =
= 5 V ±5%, TA
= 5 V ±5%; TA
–0.50
–0.50
–0.80
–0.60
–0.60
Min
Preliminary
35
24
35
24
+0.50
+0.50
+0.80
+0.60
+0.60
Max
–66
–75
Unit
dB
dB
dB
dB
dB
dB
dB
dB
dB
71