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IDT821054 QUAD PROGRAMMABLE PCM CODEC WITH MPI INTERFACE
INDUSTRIAL TEMPERATURE RANGE
7
TRANSMISSION CHARACTERISTICS
0 dBm0 is defined as 0.775 Vrms for A-law and 0.769 Vrms for -law, both for 600
load. Unless otherwise noted, the analog input is a 0 dBm0,
1020 Hz sine wave; the input amplifier is set for unity gain. The digital input is a PCM bit stream equivalent to that obtained by passing a 0 dBm0, 1020
Hz sine wave through an ideal encoder. The output level is sin(x)/x-corrected. Typical values are for VDD = +5 V and TA = 25°C.
7.1
ABSOLUTE GAIN
7.2
GAIN TRACKING
7.3
FREQUENCY RESPONSE
Parameter
Description
Min.
Typ.
Max.
Units
Test Conditions
GXA
Transmit gain, absolute
0.25
dB
Signal output of 0 dBm0, -law or A-law
GRA
Receive gain, absolute
0.25
dB
Measured relative to 0 dBm0, -law or A-law, PCM
input of 0 dBm0, 1020 Hz. RL = 10 k.
Parameter
Description
Min.
Typ.
Max.
Units
Test Conditions
GTX
Transmit gain tracking
+3 dBm0 to 37 dBm0 (exclude 37 dBm0)
37 dBm0 to 50 dBm0 (exclude 50 dBm0)
50 dBm0 to 55 dBm0
0.25
0.50
1.40
0.25
0.50
1.40
dB
Tested by sinusoidal method, A-law or -law.
GTR
Receive gain tracking
+3 dBm0 to 40 dBm0 (exclude 40 dBm0)
40 dBm0 to 50 dBm0 (exclude 50 dBm0)
50 dBm0 to 55 dBm0
0.10
0.25
0.50
0.10
0.50
dB
Tested by sinusoidal method, A-law or -law.
Parameter
Description
Min.
Typ.
Max.
Units
Test Conditions
GXR
Transmit gain, relative to GXA
f = 50 Hz
f = 60 Hz
f = 300 Hz
f = 300 to 3000 Hz (exclude 3000 Hz)
f = 3000 Hz to 3400 Hz
f = 3600 Hz
f
≥ 4600 Hz
0.10
0.15
0.60
30
0.20
0.15
0.10
35
dB
The high-pass filter is enabled.
GRR
Receive gain, relative to GRA
f < 300 Hz
f = 300 to 3000 Hz (exclude 3000 Hz)
f = 3000 Hz to 3400 Hz
f = 3600 Hz
f
≥ 4600 Hz
0.15
0.60
0
0.15
0.20
35
dB
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