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參數(shù)資料
| 型號： | T7507 |
| 元件分類： | Codec |
| 英文描述： | T7507 Quad PCM Codec with Filters, Termination Impedance, and Hybrid Balance |
| 中文描述： | T7507四路PCM編解碼器與過濾器，終端阻抗，以及混合平衡 |
| 文件頁數(shù)： | 17/30頁 |
| 文件大?。?/td> | 558K |
| 代理商： | T7507 |
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Lucent Technologies Inc.
17
Data Sheet
August 1999
Termination Impedance, and Hybrid Balance
T7507 Quad PCM Codec with Filters,
Transmission Characteristics
(continued)
ac Transmission Characteristics
Unless otherwise noted, the analog input is a –26 dBm (at 813
), 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
* 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.
Parameter
Symbol
EmW
Test Conditions
Signal input of 0.0452 Vrms
(–26 dBm at 813
at 1020 Hz)
Min
*
—
Typ
–0.20
Max
*
—
Unit
dBm0
Encoder Milliwatt
Response (transmit gain
tolerance)
Decoder Milliwatt
Response (receive gain
tolerance)
DmW
Measured differential relative to
0.902 Vrms,
PCM input of 0 dBm0 1020 Hz
RL = 10 k
, receive gain in –7.0 dB mode
Decoder gain = –3.5 dB mode
—
–7.20
—
dBm0
Relative Gain Variation
Referenced to DmW
RGR
—
3.5
—
dB
Table 12. Gain Tracking
Parameter
Symbol
GT
X
Test Conditions
+3 dBm0 to –37 dBm0
–37 dBm0 to –50 dBm0
+3 dBm0 to –37 dBm0
–37 dBm0 to –50 dBm0
Min
–0.25
–0.50
–0.25
–0.50
Typ
—
—
—
—
Max
0.25
0.50
0.25
0.50
Unit
dB
dB
dB
dB
Transmit Gain Tracking Error
Sinusoidal Input A-law
Receive Gain Tracking Error
Sinusoidal Input A-law
GT
R
Table 13. Distortion
Parameter
Symbol
SD
X
Test Conditions
3 dBm0
≥
VF
X
I
≥
–30 dBm0
–30 dBm0
≥
VF
X
I
≥
–40 dBm0
–40 dBm0
≥
VFxI
≥
–45 dBm0
3 dBm0
≥
VF
R
O
≥
–30 dBm0
–30 dBm0
≥
VF
R
O
≥
–40 dBm0
–40 dBm0
≥
VF
R
O
≥
–45 dBm0
200 Hz—3400 Hz, 0 dBm0 input,
output any other single
frequency
≤
3400 Hz
200 Hz—3400 Hz, 0 dBm0 input,
output any other single
frequency
≤
3400 Hz
Transmit or receive, two frequencies
in the range (300 Hz—3400 Hz)
at –6 dBm0
Min
35
29
25
35
29
25
—
Typ
—
—
—
—
—
—
—
Max
—
—
—
—
—
—
–38
Unit
dB
dB
dB
dB
dB
dB
dBm0
Transmit Signal to Distortion
Receive Signal to Distortion
SD
R
Single-frequency Distortion,
Transmit
SFD
X
Single-frequency Distortion,
Receive
SFD
R
—
—
–40
dBm0
Intermodulation Distortion
IMD
—
—
–42
dBm0
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