AM79Q4457J ETC1 [List of Unclassifed Manufacturers], AM79Q4457J Datasheet - Page 13

• Manufacturer Part Number: AM79Q4457J
• Description: Quad Subscriber Line Audio Processing Circuit-Non-Programmable (QSLAC-NP) Devices
• Manufacturer: ETC1 [List of Unclassifed Manufacturers]

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:
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
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
A-law digital mW or equivalent (0 dBm0)
µ-law digital mW or equivalent (0 dBm0)
Gain accuracy, either path
Attenuation distortion
Single frequency distortion
Idle channel
noise
Crosstalk between channels
End-to-end group delay
Analog-to-analog
overload compression loss
relative to 0 dBm0 loss
0.4
frequency, f
time slot.
Average
Gr
TX or RX to TX
TX or RX to RX
Description
Signal at Digital Interface
=
1. R
N
20
= 3300 Hz, f
REF
log
must be in the range: 13K
Analog out
Analog out
Analog out
Digital out
Digital out
-------------------------------------------------------------------------------------------------- -
j
1
= 300 Hz, and the frequency points (f
10
---------------------------------------------------------
----- - C f
20
1
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
digital input = 0
analog V
0 dBm0
PCLK
3 dBm0, 1004 Hz input, C-weight
6 dBm0, 1004 Hz input, C-weight
9 dBm0, 1004 Hz input, C-weight
j
+
Table 1. 0 dBm0 Voltage Definitions
2
10
log
----- - C f
20
1
Test Conditions
1.53 MHz
IN
f
---- -
f
= 0
N
1
R
j 1
REF
–
1014 Hz
Average
1014 Hz
Average
SLAC Products
300 Hz to 3 kHz
log
26K, where R
Transmit
0.6776/Gt
0.6778/Gt
unweighted
-------- -
f
j 1
f
–
j
A-law
A-law
j
, j = 2..N) are closely spaced:
-law
-law
REF
is R
–0.125
0.6776 x Gr
0.6778 x Gr
–0.25
–0.35
Min
Receive
REF1
, R
REF2A
Typ
500
+ R
REF2B
+0.125
Max
+0.25
+0.35
, or R
–46
–55
–78
–68
–76
–76
–78
–78
540
Unit
Vrms
Vrms
0.5
12
16
2
5
REF3A
dBm0p
dBrnc0
dBm0p
dBrnc0
+ R
dBm0
dBm0
dBm0
dBm0
dBm0
Unit
dB
dB
dB
dB
dB
dB
dB
µs
REF3B
Note
.
1
1
Note
6, 7
2
3
4
4
4
4
4
5
5
13