參數(shù)資料
型號(hào)： CPS1027-J
英文描述： Telecommunication IC
中文描述： 通信集成電路
文件頁(yè)數(shù)： 52/64頁(yè)
文件大小： 870K
代理商： CPS1027-J
CSP1027 Voice Band Codec for
Cellular Handset and Modem Applications
Data Sheet
January 2002
Agere Systems Inc.
52
10 Analog Characteristics and Requirements
(continued)
10.2 Analog-to-Digital Path
Notes:
The signal to distortion plus noise ratio is from the MICIN or AUXIN input to the PCM output when EIGS = 0, and from Vin (of Figure 5 on page
7) to PCM output when EIGS = 1.
The A/D 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.
* Gain is relative to the 0 dBm0 signal level with EIGS = 0 and IRSEL = 0.
Note: The frequency response scales linearly with codec oversampling clock rate. Frequencies greater than 4000 Hz are affected by antialias
filtering attenuation.
Table 16. A/D Signal to Distortion Plus Noise Ratio
Output Signal Level
Preamp
(EIGS = 0)
0.5 Vp Range
(cioc0: IRSEL = 0)
Min
71
62
42
32
27
17
Preamp
(EIGS = 0)
0.16 Vp Range
(cioc0: IRSEL = 1)
Min
68
59
39
29
24
14
Ext. Gain Select
(EIGS = 1)
1.578 Vp Range
Unit
Max
—
—
—
—
—
—
Max
—
—
—
—
—
—
Min
71
62
42
32
27
17
Max
—
—
—
—
—
—
0 dBm0
–10 dBm0
–30 dBm0
–40 dBm0
–45 dBm0
–55 dBm0
dB
dB
dB
dB
dB
dB
Table 17. A/D Relative Gain Accuracy
*
Output Signal Level
+3 dBm0 to –40 dBm0
–40 dBm0 to –50 dBm0
–50 dBm0 to –55 dBm0
Min
–0.1
–0.4
–1.2
Max
0.1
0.4
1.2
Unit
dB
dB
dB
Table 18. A/D Frequency Response Relative to 1 kHz Output Level (f
OS
= 1 MHz and f
S
= 8 kHz)
Frequency
High-Pass Filter Enabled
(HPFE = 0)
Min
50 Hz
—
60 Hz
—
100 Hz
–34
200 Hz
–12
300 Hz
–0.25
3000 Hz
–0.25
3400 Hz
–0.9
4000 Hz
—
4600 Hz
—
8000 Hz
—
High-Pass Filter Disabled
(HPFE = 1)
Min
–0.25
–0.25
–0.25
–0.25
–0.25
–0.4
–0.9
—
—
—
Unit
Max
–40
–40
–18
0
0.25
0.25
0.25
–6
–35
–45
Max
0.25
0.25
0.25
0.25
0.25
0.25
0.25
–6
–35
–45
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
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