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UCB1510DB

AC97 digital modem codec

Philips Electronics 

Philips Semiconductors

UCB1510

AC97 digital modem codec

7. Functional description

The functional description of the devices id described in Section 8 through

Section 15.

8. Telecom codec

The telecom codec contains an input channel, built up from a 64 times oversampling

sigma delta analog to digital converter (ADC) with digital decimation filters,

programmable gain and attenuation and built-in sidetone suppression circuit.

The output path consists of a digital up sample filter, a 64 time oversampling 4 bit

digital to analog converter (DAC) circuit with integrated filter followed by a differential

output driver, capable of directly driving a 600 Ω isolation transformer. The output

path includes a mute function. The telecom codec also incorporates loop back

modes, in which codec output path and the input path are connected in series. The

loop back tap and entry points are identified as circled letters in Figure 3, loop back

modes are described in the AClink register definition.

sidetone_enable

ADC[3:2]

TINP

TINN

SIDETONE

SUPPRESSION

CIRCUIT

ADC

J

H

DIGITAL

14

DECIMATION

FILTER

G

TOUTP

E

TOUTN

D

DAC

C

DIGITAL

14

NOISE

SHAPER

B

DAC Mute

Fig 3. Telecom codec block diagram

9397 750 06856

Preliminary specification

The telecom sample rate (fst) is derived from the AC master clock and is

programmable using the sample rate registers. Not all AC97 specified sample rates

are supported, refer to Table 3 “Sampling frequencies” for details.

PCM data is transferred in the slot 5 of the AClink.

Rev. 01 — 4 February 2000

© Philips Electronics N.V. 2000. All rights reserved.

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