參數(shù)資料
型號： PCF50732H
廠商： NXP SEMICONDUCTORS
元件分類： 通信及網(wǎng)絡(luò)
英文描述： Baseband and audio interface for GSM
中文描述： SPECIALTY TELECOM CIRCUIT, PQFP48
封裝： PLASTIC, LQFP-48
文件頁數(shù)： 16/64頁
文件大小： 322K
代理商： PCF50732H
1999 May 03
16
Philips Semiconductors
Objective specification
Baseband and audio interface for GSM
PCF50732
Baseband Serial Interface (BSI) receive path
(see Fig.6)
t
11
analog power-up and filter settling time
ZIF mode
NZIF mode
BIOCLK cycle time
ZIF mode
NZIF mode
BOEN LOW after falling clock edge
BIOCLK falling edge to data valid
BOEN HIGH after falling clock edge
52
26
μ
s
μ
s
t
12
2t
1
t
1
15
15
15
ns
ns
ns
ns
ns
t
13
t
14
t
15
SYMBOL
PARAMETER
MIN.
TYP.
MAX.
UNIT
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.
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