參數(shù)資料
型號： CSP1027
元件分類： Codec
英文描述： CSP1027 Voice Band Codec for Cellular Handset and Modem Applications
中文描述： CSP1027語音頻帶編解碼器的蜂窩手機(jī)和調(diào)制解調(diào)器應(yīng)用
文件頁數(shù)： 53/64頁
文件大?。?/td> 937K
代理商： CSP1027
Lucent Technologies Inc.
Data Sheet
December 1999
CSP1027 Voice Band Codec for
Cellular Handset and Modem Applications
53
10 Analog Characteristics and Requirements
(continued)
10.3 Digital-to-Analog Path
Notes:
The D/A signal to distortion plus noise ratio decreases by 3 dB for each 3 dB gain step below 0 dB. The D/A SDNR is specified with a differential
load. For a single-ended load, the D/A SDNR is degraded by about 6 dB.
The D/A signal to distortion plus noise ratio is valid for sampling rates up to 16 kHz. For sampling rates between 16 kHz and 24 kHz, the signal
to distortion plus noise ratio is no better than 60 dB.
Table 19. D/A Signal to Distortion Plus Noise Ratio (0 dB Output Setting)
Output Signal Level
0 dBm0
–10 dBm0
–30 dBm0
–40 dBm0
–45 dBm0
–55 dBm0
Min
72
62
42
32
27
17
Max
—
—
—
—
—
—
Unit
dB
dB
dB
dB
dB
dB
Table 20. D/A Relative Gain Accuracy*
Output Signal Level
+3 dBm0 to –40 dBm0
–40 dBm0 to –50 dBm0
–50 dBm0 to –55 dBm0
* Gain is relative to the 0 dBm0 signal level. Absolute gain accuracy at the 0 dBm0 signal level is ±0.18 dB. Digital-to-analog path gain is spec-
ified with a differential load; a single-ended load adds ±0.1 dB to absolute gain.
Min
–0.1
–0.4
–1.2
Max
0.1
0.4
1.2
Unit
dB
dB
dB
Table 21. D/A Output Gain Adjustment
Gain Setting
Min
–0.2
–3.21
–6.22
–9.23
–12.24
.
.
.
–42.34
–45.35
Typ
0
–3.01
–6.02
–9.03
–12.04
.
.
.
–42.14
–45.15
Max
0.2
–2.81
–5.82
–8.83
–11.84
.
.
.
–41.94
–44.95
Unit
dB
dB
dB
dB
dB
.
.
.
dB
dB
0 dB
–3 dB
–6 dB
–9 dB
–12 dB
.
.
.
–42 dB
–45 dB
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