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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 (continued)
Table 9. Noise
Parameter
Transmit Noise, A-Law
Receive Noise, A-Law
Noise, Single Frequency
Power Supply Rejection Transmit
Power Supply Rejection Receive
Spurious Out-of-Band Signals at
VFRO Relative to Input
Symbol
NXp
NRp
NRS
PSRX
PSRX
SOS
Test Conditions
Input amplifier gain = 36 dB
PCM code is A-law positive one.
f = 0 kHz—100 kHz,
VFXIN = 0 Vrms, measurement at
VFRO, DR = DX
VDD = 5.0 Vdc + 100 mVrms:
f = 0 kHz—4 kHz
f = 4 kHz—50 kHz
PCM code is positive one LSB.
VDD = 5.0 Vdc + 100 mVrms:
f = 0 kHz—4 kHz
f = 4 kHz—25 kHz
f = 25 kHz—50 kHz
0 dBm0, 300 Hz—3400 Hz input
PCM code applied:
4600 Hz—7600 Hz
7600 Hz—8400 Hz
8400 Hz—50 kHz
Min Typ Max
— –68.5 –68
— –82 –75
— — –53
36 — —
30 — —
36 — —
40 — —
30 — —
— — –30
— — –40
— — –30
Unit
dBm0p
dBm0p
dBm0
dB
dB
dB
dB
dB
dB
dB
dB
Table 10. Receive Gain Relative to Gain at 1.02 kHz
Frequency (Hz)
Min
Typ
Max
Unit
Below 3000
–0.150
±0.04
0.150
dB
3140
–0.570
±0.04
0.150
dB
3380
–0.735
–0.50
0.010
dB
3860
—
–10.70
–9.400
dB
4600 and above
—
—
–28
dB
Table 11. Transmit Gain Relative to Gain at 1.02 kHz
Frequency (Hz)
Min
Typ
Max
Unit
16.67
—
–50
–30
dB
40
—
–34
–26
dB
50
—
–36
–30
dB
60
—
–50
–30
dB
200
–1.800
–0.5
0
dB
300 to 3000
–0.150
±0.04
0.150
dB
3140
–0.570
±0.04
0.150
dB
3380
–0.735
–0.50
0.010
dB
3860
—
–10.70
–9.400
dB
4600 and above
—
—
–32
dB
8
Lucent Technologies Inc.
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