CSP1027 datasheet(52/64 Pages) AGERE

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CSP1027 Voice Band Codec for

Data Sheet

Cellular Handset and Modem Applications

December 1999

Lucent Technologies Inc.

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)

Preamp

(EIGS = 0)

0.16 Vp Range

(cioc0: IRSEL = 1)

Ext. Gain Select

(EIGS = 1)

1.578 Vp Range

Unit

Min

Max

Min

Max

Min

Max

0 dBm0

—

–10 dBm0

—

–30 dBm0

—

–40 dBm0

—

–45 dBm0

—

–55 dBm0

—

Table 17. A/D Relative Gain Accuracy*

Output Signal Level

Min

Max

Unit

+3 dBm0 to –40 dBm0

–0.1

0.1

–40 dBm0 to –50 dBm0

–0.4

0.4

–50 dBm0 to –55 dBm0

–1.2

1.2

Table 18. A/D Frequency Response Relative to 1 kHz Output Level (fOS = 1 MHz and fS = 8 kHz)

Frequency

High-Pass Filter Enabled

(HPFE = 0)

High-Pass Filter Disabled

(HPFE = 1)

Unit

Min

Max

Min

Max

50 Hz

—

–40

–0.25

0.25

60 Hz

—

–40

–0.25

0.25

100 Hz

–34

–18

–0.25

0.25

200 Hz

–12

–0.25

0.25

300 Hz

–0.25

0.25

–0.25

0.25

3000 Hz

–0.25

0.25

–0.4

0.25

3400 Hz

–0.9

0.25

–0.9

0.25

4000 Hz

—

–6

—

–6

4600 Hz

—

–35

—

–35

8000 Hz

—

–45

—

–45

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