PCF50732H/F1 데이터 시트보기 (PDF) - Philips Electronics

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PCF50732H/F1

Baseband and audio interface for GSM

Philips Electronics 

Philips Semiconductors

Baseband and audio interface for GSM

Objective specification

PCF50732

SYMBOL

PARAMETER

Baseband Serial Interface (BSI) receive path (see Fig.6)

t11

analog power-up and filter settling time

ZIF mode

NZIF mode

t12

BIOCLK cycle time

ZIF mode

NZIF mode

t13

BOEN LOW after falling clock edge

t14

BIOCLK falling edge to data valid

t15

BOEN HIGH after falling clock edge

MIN.

TYP.

MAX. UNIT

−

52

−

µs

−

26

−

µs

−

2t1

−

ns

−

t1

−

ns

−

−

15

ns

−

−

15

ns

−

−

15

ns

10 VOICE BAND CODEC

The voice band CODEC is a complete analog front-end

circuit. It consists of three parts:

• The receive path, which converts a digital linear PCM

signal to an analog signal for an earpiece, an external

loudspeaker or a buzzer

• The transmit path, which receives an analog signal

from a microphone or an auxiliary input and converts it

into a digital linear PCM signal

• The digital Audio Serial Interface (ASI), which

connects the digital linear PCM signals of the receive

and transmit paths to a digital signal processor.

Various functions and characteristics of the voice band

CODEC can be selected by programming the

corresponding control registers in the Control register

block (see also Tables 11, 22, 23, 24 and 25).

10.1 Voice band receive path

The voice band receive path consists of the following

parts:

• The receive part of the voice band signal processor

• NOISE SHAPER: 3rd order digital Σ∆ modulator,

generates a bit stream at 1 MHz to drive the EARDAC

• EARDAC: digital-to-analog converter including

low-pass filter for high frequency noise content of noise

shaper

• EARAMP: amplifier for an earpiece

• AUXAMP: amplifier for an auxiliary loudspeaker

• BUZAMP: amplifier for a buzzer output.

Linearity of receiver equipment (to earpiece) at

EARPGA = 0 dB and a volume control (VOLPGA and

EARAMP or AUXAMP) of −12 dB, signal-to-total harmonic

distortion ratio according to “GSM recommendation

II.11.10 V.4.16.1”.

10.1.1 RXVOL

RXVOL controls the volume of the voice band receive

path. In conjunction with EARAMP, AUXAMP and

BUZAMP it allows a gain variation from +6 to −30 dB in

64 steps; see Table 25. RXVOL also provides a mute

selection of the three outputs EARP/EARN, AUXSP and

BUZ respectively. At RESET the volume is automatically

set to −12 dB.

10.1.2 RXPGA

RXPGA controls the gain of the voice band receive path

within a range of −24 to +12 dB in 64 steps for calibration

purposes.

10.1.3 RXFILTER

RXFILTER is a digital band-pass filter with a pass band

from 300 to 3400 Hz. It is realized by a programmable

structure (voice band signal processor).

10.1.4 EARDAC

EARDAC is a DAC operating at a sampling frequency of

1 MHz. It converts the bitstream input to a sampled

differential analog signal and low-pass filters the output

signal at the same time.

1999 May 03

16

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