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參數(shù)資料
| 型號： | AM79D2251VC |
| 廠商： | ADVANCED MICRO DEVICES INC |
| 元件分類： | 編解碼器 |
| 英文描述： | Dual Intelligent Subscriber Line Audio-Processing Circuit (ISLAC) |
| 中文描述： | PCM CODEC, PQFP44 |
| 封裝： | PLASTIC, TQFP-44 |
| 文件頁數(shù)： | 17/35頁 |
| 文件大?。?/td> | 410K |
| 代理商： | AM79D2251VC |
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Am79D2251
17
Transmission and Signaling Specifications
Table 1. 0 dBm0 Voltage Definitions with Unity Gain in X, R, GX, GR, AX, and AR
28
Capacitance load on XSB1
–
2, XSC
400
pF
5
Signal at Digital Interface
Transmit
0.5026
0.4987
0.5026
Receive
0.5026
0.4987
0.5025
Unit
A-law digital mW or equivalent (0 dBm0)
μ
-law digital mW or equivalent (0 dBm0)
±5,800 peak linear coded sine wave
Vrms
No.
1
Item
Condition
Min
Typ
Max
Unit
Note
Insertion Loss
A-D
D-A
A-D + D-A
A-D + D-A
Input: 1014Hz,
–
10dBm0
RG = AR = AX = GR = GX = 0 dB,
AISN, R, X, B and Z filters disabled
Temperature = 70
°
C
Variation over temperature
–
0.25
–
0.25
–
0.15
–
0.1
–
0.1
0
0
0
0
+0.25
+0.25
+0.015
+0.1
0.1
dB
6
2
Level set error (Error between
setting and actual value)
DR to DX gain in full digital
loopback mode
A-D AX + GX
D-A AR + GR
DR Input: 1014 Hz,
–
10 dBm0
RG=AR=AX=GR=GX=0 dB,
DISN, R, X, B and Z filters disabled
Off-hook and On-hook
AX = 0dB
AR = 0dB
A-D (PCM output)
D-A (V
OUT
)
3
–
0.3
+0.3
4
Idle Channel Noise,
Psophometric Weighted (A-law)
–
69
–
78
dBm0p
11
5
Idle Channel Noise,
C Message weighted (μ-law)
Off-hook and On-hook
AX = 0dB
AR = 0dB
A-D (PCM output)
D-A (V
OUT
)
+19
+12
+7
0.1
0.1
dBrnC0
11
6
7
8
9
Coder Offset decision value, Xn
GX step size
GR step size
PSRR (VCC)
Image frequency
A-D, Input signal = 0V
0
≤
GX < 12 dB
–
12
≤
GR
≤
0 dB
Input: 4.8 to 7.8 kHz, 200 mV p-p
Measure 8000 Hz-Input frequency
A-D
D-A
–
7
Bits
5
5
5
5
dB
37
37
10
DISN gain accuracy
Gdisn = ±0.9375 Vin = 0 dBm0
Gdisn =
–
0.9375 to 0.9375
1014 Hz;
–
10 dBmO
B = Z = 0; X = R = 1
–
0.25
+0.25
dB
2
11
End-to-end group delay
525
μ
S
13,
12,
5
12
Crosstalk
same channel
TX to RX
RX to TX
0 dBm0
0 dBm0
300 Hz to 3400 Hz
300 Hz to 3400 Hz
–
75
–
75
dBm0
No.
Item
Condition
Min
Typ
Max
Unit
Note
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