T7507 Quad PCM Codec with Filters,
Termination Impedance, and Hybrid Balance
Data Sheet
August 1999
Transmission Characteristics (continued)
ac Transmission Characteristics (continued)
Table 15. Decoder Limits Relative to Gain at 1020 Hz
Frequency (Hz)
15.6
Min
–0.150
–0.150
–0.150
–0.150
–0.150
–0.550
–0.850
—
Typ
—
—
—
—
—
—
—
—
—
Max
0.150
0.150
0.150
0.150
0.150
0.150
0.150
–13.40
–28.00
Unit
dB
dB
dB
dB
dB
dB
dB
dB
dB
46.8
62.5
453
2734
3140
3375
3984
5015
—
Table 16. Encoder Limits, Includes Effect of Termination Impedance Filter Relative to Gain at 1020 Hz
Frequency (Hz)
15.6
Min
—
Typ
—
—
—
—
—
—
—
—
—
Max
Unit
dB
dB
dB
dB
dB
dB
dB
dB
dB
–30.500
–25.600
–29.400
0.700
46.8
—
62.5
—
453
0.400
–2.950
–3.950
–4.550
—
2734
–2.650
–3.250
–3.850
–18.30
–35.00
3140
3375
3984
5015
—
Table 17. Termination Impedance Limits Relative to Gain at 1020 Hz
Frequency (Hz)
46.8
Min
0
Typ
—
—
—
—
—
—
—
—
Max
1
Unit
dB
dB
dB
dB
dB
dB
dB
dB
62.5
0.3
0.8
453
0.45
–2.95
–3.60
–4.05
–5.05
–6.35
0.65
–2.65
–3.20
–3.55
–4.45
–5.65
2734
3140
3375
3984
5015
Table 18. Hybrid Path Limits Relative to Gain at 1020 Hz
Frequency (Hz)
46.8
Min
—
Typ
—
—
—
—
—
—
—
Max
–26.000
–30.000
0.180
Unit
dB
dB
dB
dB
dB
dB
dB
62.5
—
453
–0.180
–0.410
–0.700
–1.640
—
2734
–0.050
0.100
3140
3375
–0.840
–25.00
3984
Lucent Technologies Inc.
19
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