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| 型號： | AM79Q031 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Quad Subscriber Line Audio-Processing Circuit (QSLAC) Devices |
| 中文描述： | 四用戶線路音頻處理電路（QSLAC）設(shè)備 |
| 文件頁數(shù)： | 13/68頁 |
| 文件大?。?/td> | 1361K |
| 代理商： | AM79Q031 |
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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, f
N
= 3300 Hz, f
1
= 300 Hz, and the frequency points (f
j
, 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)
μ
-law digital mW or equivalent (0 dBm0)
±22,827 peak linear coded sine wave
0.7804
0.7804
Vrms
0.7746
0.7746
0.7804
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
–
0.30
–
0.40
–
0.25
–
0.25
–
0.125
+0.25
+0.30
+0.30
+0.40
+0.25
+0.25
+0.125
–
46
dB
Gain accuracy digital-to-digital
Gain accuracy analog-to-analog
Attenuation distortion
Single frequency distortion
Idle channel noise
Analog out
300 Hz to 3 kHz
1
2
Digital out
Digital looped back
weighted
unweighted
Digital input = 0
Digital input = 0
Analog V
IN
= 0 VAC
Analog V
IN
= 0 VAC
0 dBm0
0 dBm0
0 dBm0
A-law
μ
-law
A-law
μ
-law
0
0
–
68
–
55
–
78
12
–
68
16
–
75
–
75
dBm0p
dBm0
dBm0p
dBrnc0
dBm0p
dBrnc0
3
3
3
3, 6
3
3, 6
CrosstalkTX to RX
same channelRX to TX
Crosstalk between channels
TX or RX to TX
TX or RX to RX
End-to-end group delay
300 Hz to 3400 Hz
300 Hz to 3400 Hz
dBm0
1014 Hz, Average
1014 Hz, Average
–
76
–
78
678
dBm0
4
B = Z = 0; X = R = 1
μs
5
Average
20
10
1
-----
20
C f
j
( )
10
2
1
-----
20
C f
j
(
1
–
)
+
f
f
j
1
–
---------
log
f
N
f
1
----
log
--------------------------------------------------------------------------------------------------
log
=
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