參數(shù)資料
型號(hào)： AM79Q021JC
廠商： ADVANCED MICRO DEVICES INC
元件分類： 編解碼器
英文描述： PCM CODEC, PQCC44
封裝： PLASTIC, LCC-44
文件頁(yè)數(shù)： 5/64頁(yè)
文件大小： 911K
代理商： AM79Q021JC
SLAC Products
13
Transmission Characteristics
Table 1. 0 dBm0 Voltage Definitions with Unity Gain in X, R, GX, GR, AX, and AR
When relative levels (dBm0) are used in any of the following transmission specifications, the specification holds for
any setting of the GX gain from 0 dB to 12 dB and the GR loss from 0 dB to 12 dB.
Notes:
1. Also see Figure 1 and Figure 2.
2. 0 dBm0 input signal, 300 Hz to 3400 Hz; measurement at any other frequency, 300 Hz to 3400 Hz.
3. No single frequency component in the range above 3800 Hz may exceed a level of –55 dBm0.
4. The weighted average of the crosstalk is defined by the following equation, where C(f) is the crosstalk in dB as a function of
frequency, fN = 3300 Hz, f1 = 300 Hz, and the frequency points (fj, j = 2..N) are closely spaced:
5. The End-to-End Group Delay is the sum of the transmit and receive group delays (both measured using the same time and
clock slot).
6. Typical values not tested in production.
Signal at Digital Interface
Transmit
Receive
Unit
A-law digital mW or equivalent (0 dBm0)
0.7804
Vrms
-law digital mW or equivalent (0 dBm0)
0.7746
±22,827 peak linear coded sine wave
0.7804
Description
Test Conditions
Min
Typ
Max
Unit
Note
Gain accuracy, D/A or A/D
0 dBm0, 1014 Hz
AX = AR = 0 dB
0 to 85
°C
–40
°C
AX = +6.02 dB and/or
AR = –6.02 dB
0 to 85
°C
–40
°C
–0.25
–0.30
–0.40
+0.25
+0.30
+0.40
dB
Gain accuracy digital-to-digital
–0.25
+0.25
Gain accuracy analog-to-analog
–0.25
+0.25
Attenuation distortion
300 Hz to 3 kHz
–0.125
+0.125
1
Single frequency distortion
–46
2
Idle channel noise
Analog out
Digital out
Digital looped back
weighted
unweighted
Digital input = 0
A-law
Digital input = 0
-law
Analog VIN = 0 VAC
A-law
Analog VIN = 0 VAC
-law
0
–68
–55
–78
12
–68
16
dBm0p
dBm0
dBm0p
dBrnc0
dBm0p
dBrnc0
3
3, 6
3
3, 6
CrosstalkTX to RX
same channelRX to TX
0 dBm0
300 Hz to 3400 Hz
0 dBm0
300 Hz to 3400 Hz
–75
dBm0
Crosstalk between channels
TX or RX to TX
TX or RX to RX
0 dBm0
1014 Hz, Average
–76
–78
dBm0
4
End-to-end group delay
B = Z = 0; X = R = 1
678
s
5
Average
20
10
1
20
------
Cf
j
()
10
1
20
------
Cf
j1
–
()
+
2
---------------------------------------------------------
f
j
f
j1
–
---------
log
j
∑
f
N
f
1
-----
log
---------------------------------------------------------------------------------------------------
log
=
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