SLAC Products
13
Transmission Characteristics
Notes:
1. Gt and Gr are defined in the Transmit Gain Select and Receive Gain Select tables on 28 and 29. Gr must be in the range:
0.4
≤ Gr ≤ 1. R
REF must be in the range: 13K ≤ RREF ≤ 26K, where RREF is RREF1, RREF2A + RREF2B, or RREF3A + RREF3B.
2. Also see the following Attenuation Distortion figure.
3. Measured with a 0 dBm0 input signal, 300 Hz to 3400 Hz; output measured at any other frequency 300 Hz to 3400 Hz.
4. No single frequency component in the range above 3800 Hz may exceed a level of –55 dBm0.
5. 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, f1 = 300 Hz, and the frequency points (fj, j = 2..N) are closely spaced:
6. See following Group Delay Distortion figure also.
7. The End-to-End Group Delay is the sum of the transmit and receive group delays where both are measured using the same
time slot.
Table 1. 0 dBm0 Voltage Definitions
Signal at Digital Interface
Transmit
Receive
Unit
Note
A-law digital mW or equivalent (0 dBm0)
0.6776/Gt
0.6776 x Gr
Vrms
1
µ-law digital mW or equivalent (0 dBm0)
0.6778/Gt
0.6778 x Gr
Vrms
1
Description
Test Conditions
Min
Typ
Max
Unit
Note
Gain accuracy, either path
0 dBm0, 1014 Hz
0°C to 85°C
Am79Q5457, or
Am79Q4457, Gt = Gt1, Gr = Gr1
–40°C (All), or
Am79Q4457, Gt = Gt2 or Gt = Gt3,
or Gr = Gr2 or Gr = Gr3
–0.25
–0.35
+0.25
+0.35
dB
dB
Attenuation distortion
300 Hz to 3 kHz
–0.125
+0.125
dB
2
Single frequency distortion
–46
dB
3
Idle channel
Analog out
noise
Analog out
Analog out
Digital out
Digital out
unweighted
digital input = 0
A-law
µ-law
analog V
IN = 0
A-law
µ-law
–55
–78
12
–68
16
dBm0
dBm0p
dBrnc0
dBm0p
dBrnc0
4
4
4
4
4
Crosstalk between channels
TX or RX to TX
TX or RX to RX
0 dBm0
1014 Hz
Average
1014 Hz
Average
–76
–76
–78
–78
dBm0
dBm0
dBm0
dBm0
5
5
End-to-end group delay
PCLK
≥ 1.53 MHz
500
540
µs
6, 7
Analog-to-analog
overload compression loss
relative to 0 dBm0 loss
3 dBm0, 1004 Hz input, C-weight
6 dBm0, 1004 Hz input, C-weight
9 dBm0, 1004 Hz input, C-weight
0.5
2
5
dB
dB
dB
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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