T7507 Quad PCM Codec with Filters,
Termination Impedance, and Hybrid Balance
Data Sheet
August 1999
Transmission Characteristics (continued)
ac Transmission Characteristics
Unless otherwise noted, the analog input is a –26 dBm (at 813 Ω), 1020 Hz sine wave. The digital input is a PCM
bit stream equivalent to that obtained by passing a 0 dBm0, 1020 Hz sine wave through an ideal encoder. The out-
put level is sin(x)/x-corrected.
Table 11. Absolute Gain
Typ†
†
†
Parameter†
Symbol†
Test Conditions†
Min*
Max* Unit†
Encoder Milliwatt
Response (transmit gain
tolerance)
EmW
Signal input of 0.0452 Vrms
(–26 dBm at 813 Ω at 1020 Hz)
—
–0.20
—
dBm0
Decoder Milliwatt
Response (receive gain
tolerance)
DmW
RGR
Measured differential relative to
0.902 Vrms,
PCM input of 0 dBm0 1020 Hz
RL = 10 kΩ, receive gain in –7.0 dB mode
—
–7.20
3.5
—
dBm0
Relative Gain Variation
Referenced to DmW
Decoder gain = –3.5 dB mode
—
—
dB
* Combination test results are translated into system-level characteristics guaranteed by Table 21, Figure 8, and Figure 9.
† Overall system-level tolerances are +0.3 dB to –0.7 dB in both directions. Therefore, nominal analog levels are shifted by –0.2 dB.
Table 12. Gain Tracking
Parameter
Symbol
Test Conditions
Min
Typ Max Unit
Transmit Gain Tracking Error
Sinusoidal Input A-law
GTX
+3 dBm0 to –37 dBm0
–37 dBm0 to –50 dBm0
–0.25
–0.50
—
—
0.25
0.50
dB
dB
Receive Gain Tracking Error
Sinusoidal Input A-law
GTR
+3 dBm0 to –37 dBm0
–37 dBm0 to –50 dBm0
–0.25
–0.50
—
—
0.25
0.50
dB
dB
Table 13. Distortion
Parameter
Symbol
Test Conditions
Min
35
29
25
35
29
25
—
Typ Max Unit
Transmit Signal to Distortion
SDX
3 dBm0 ≥ VFXI ≥ –30 dBm0
–30 dBm0 ≥ VFXI ≥ –40 dBm0
–40 dBm0 ≥ VFxI ≥ –45 dBm0
3 dBm0 ≥ VFRO ≥ –30 dBm0
–30 dBm0 ≥ VFRO ≥ –40 dBm0
–40 dBm0 ≥ VFRO ≥ –45 dBm0
—
—
—
—
—
—
—
—
—
—
—
—
—
dB
dB
dB
dB
dB
dB
Receive Signal to Distortion
SDR
Single-frequency Distortion,
Transmit
SFDX
SFDR
IMD
200 Hz—3400 Hz, 0 dBm0 input,
output any other single
–38 dBm0
–40 dBm0
–42 dBm0
frequency ≤ 3400 Hz
Single-frequency Distortion,
Receive
200 Hz—3400 Hz, 0 dBm0 input,
output any other single
—
—
—
—
frequency ≤ 3400 Hz
Intermodulation Distortion
Transmit or receive, two frequencies
in the range (300 Hz—3400 Hz)
at –6 dBm0
Lucent Technologies Inc.
17
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