AM79C30A datasheet(71/101 Pages) AMD

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Am79C30A/32A Data Sheet

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.

A law = 625 mV rms

µ law = 620 mV rms

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.

A law = 1.25 mV rms

µ law = 1.2 mV rms

Table 54.

Codec Performance Specifications (Am79C30A only)

Parameter

Symbol

Parameter Descriptions

Test Conditions

Preliminary

Unit

Min

Max

TXG

Transmit absolute gain

0 dBm0; 1020 Hz; VCC = 5 V ±5%, TA

= 0°C–70°C; over all GA

–0.50

+0.50

RXGE

Receive absolute gain at EAR1/EAR2

(nominal)

0 dBm0; 1020 Hz; VCC = 5 V ±5%; TA

= 0°C–70°C; Rload = 540 ohms

–0.50

+0.50

RXGL

Receive absolute gain

0 dBm0; 1020 Hz; VCC = 5 V ±5%; TA =

0°C–70°C; Rload = 40 ohms

–0.80

+0.80

TXSTD

Transmit signal/total distortion; CCITT method

2, 1020 Hz (Tx gain = 0)

–10 dBm0

–45 dBm0

RXSTD

Receive signal/total distortion; CITT method 2,

1020 Hz (Rx gain = 0)

–10 dBm0

–45 dBm0

TXGT

Transmit gain tracking; CCITT method 2, 1020

Hz (Tx gain = 0)

–45

–0.60

+0.60

RXGT

Receive gain tracking; CCITT method 2, 1020

Hz (Rx gain = 0)

–45

–0.60

+0.60

TXICN

Transmit Idle channel Noise AINA connected to

AREF

GX = 6 dB, GA = 18 dB

–66

RXICN

Receive Idle channel Noise

GR = –12 dB, GER = 0 dB

–75

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

for all transmit tests.

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

performance may occur if used single ended rather than differential.

0.1 µF

AINA or AINB

100K

AREF

Transmit Test Circuit with Input Source Referenced to AREF

AM79C30A Datasheet(PDF) 71 Page - Advanced Micro Devices

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