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T7502 Datasheet PDF : 16 Pages
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T7502 Dual PCM Codec with Filters
Data Sheet
February 1998
Transmission Characteristics (continued)
ac Transmission Characteristics
Unless otherwise noted, the analog input is a 0 dBm0, 1020 Hz sine wave; the input amplifier is set for unity gain.
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 output level is sin(x)/x-corrected.
Table 5. Absolute Gain
Parameter
Encoder Milliwatt
Response (transmit gain
tolerance)
Decoder Milliwatt
Response (receive gain
tolerance)
Symbol
EmW
DmW
Test Conditions
Signal input of 0.775 Vrms A-law
Measured single-ended relative to
0.775 Vrms A-law,
PCM input of 0 dBm0 1020 Hz
RL = 10 kΩ
Min Typ
–0.25 —
Max Unit
0.25 dBm0
–0.25 — 0.25 dBm0
Table 6. Gain Tracking
Parameter
Transmit Gain Tracking Error
Sinusoidal Input
Receive Gain Tracking Error
Sinusoidal Input
Symbol
GTX
GTR
Test Conditions
+3 dBm0 to –37 dBm0
–37 dBm0 to –50 dBm0
+3 dBm0 to –37 dBm0
–37 dBm0 to –50 dBm0
Min Typ Max Unit
–0.25 — 0.25 dB
–0.50 — 0.50 dB
–0.25 — 0.25 dB
–0.50 — 0.50 dB
Table 7. Distortion
Parameter
Symbol
Test Conditions
Min Typ Max Unit
Transmit Signal to Distortion SDX A-law +3 dBm0 ≤ VFXI ≤ –30 dBm0 35
—
—
dB
A-law –30 dBm0 ≤ VFXI ≤ –40 dBm0 29
—
—
dB
A-law –40 dBm0 ≤ VFxI ≤ –45 dBm0 25
—
—
dB
Receive Signal to Distortion
SDR A-law +3 dBm0 ≤ VFRO ≤ –30 dBm0 35
—
—
dB
A-law –30 dBm0 ≤ VFRO ≤ –40 dBm0 29
—
—
dB
A-law –40 dBm0 ≤ VFRO ≤ –45 dBm0 25
—
—
dB
Single Frequency Distortion, SFDX 200 Hz—3400 Hz, 0 dBm0 input,
—
— –38 dBm0
Transmit
output any other single
frequency ≤ 3400 Hz
Single Frequency Distortion, SFDR 200 Hz—3400 Hz, 0 dBm0 input,
—
— –40 dBm0
Receive
output any other single
frequency ≤ 3400 Hz
Intermodulation Distortion
IMD Transmit or receive, two frequencies —
in the range (300 Hz—3400 Hz)
at –6 dBm0
— –42 dBm0
6
Lucent Technologies Inc.
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