參數(shù)資料
型號(hào)： 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(yè)數(shù)： 17/64頁(yè)
文件大?。?/td> 322K
代理商： PCF50732H
1999 May 03
17
Philips Semiconductors
Objective specification
Baseband and audio interface for GSM
PCF50732
10.1.5
EARAMP
EARAMP is an amplifier, capable of driving a standard
earpiece with a minimum impedance of 8
in
single-ended mode or 16
in differential mode.
10.1.6
AUXAMP
AUXAMP is an amplifier for connection to an external
loudspeaker amplifier of minimum 8
(hands-free car kit).
An
‘a(chǎn)uxiliary speaker external amplifier control’ output
pin
(AMPCTRL) can be used to switch on/off an external
amplifier (hands-free car kit). The status of AMPCTRL is
programmable via the Control Serial Interface; its default
value is on.
10.1.7
BUZAMP
BUZAMP is an amplifier for connection to an external
buzzer of minimum 8
. It has the same output
characteristics as the AUXAMP and can hence be used as
a second auxiliary output amplifier. It is switched on/off by
a dedicated control bit in the Control register block.
10.2
Voice band transmit path
The voice band transmit path consists of the following
parts:
MICMUX:
microphone input multiplexer
MICADC:
Σ
analog-to-digital converter
DECIMATOR:
decimates the incoming bit stream from
1 MHz to 40 kHz
TXFILTER:
band-pass filter for the digital transmit signal
and down-sampling
TXPGA/LIM:
fine-programmable gain for calibration,
limiter
SidePGA:
voice band sidetone programmable gain
amplifier.
Linearity of transmitter equipment, signal-to-total harmonic
distortion ratio according to “GSM recommendation
II.11.10 V.4.16.1”
10.2.1
MICMUX
MICMUX is used to select between a differential signal at
pins MICP/MICN and a differential signal at pins
AUXMICP/AUXMICN.
Values are specified for a standard electret microphone
with a sensitivity of
64
±
3 dB for high gain or for an
external microphone with an amplifier sensitivity of
26
±
3 dB (0 dB
≡
1 V/0.1 Pa = 1 V/
μ
bar; at 1 kHz).
10.2.2
MICADC
MICADC is a
Σ
A/D converter which generates a 1 MHz
bitstream.
10.2.3
DECIMATOR
AND
TXFILTER
The DECIMATOR is a digital filter, which performs a signal
processing to a lower sampling rate at the output
compared to the input.
The bitstream with a sampling frequency of 1 MHz is
low-pass filtered and down-sampled to 40 kHz by a FIR
filter.
A digital high-pass filter and a digital low-pass filter (both
IIR filters) process the 14-bit input samples to achieve a
band-pass with a pass band from 300 to 3400 Hz. These
filters run on the on-chip voice band signal processor (see
Fig.7). It’s program is down-loaded into the instruction
memory (IRAM) via the CSI (see Table 26).
The output of the TXFILTER is down-sampled to a
sampling frequency of 8 kHz with a word length of 16 bits.
10.2.4
TXPGA
TXPGA adapts the analog signals coming from MICMUX
within a range of
30 to +6 dB. It is designed for calibration
purposes.
10.2.5
S
IDE
PGA
SidePGA loops part of the voice band transmit signal back
into the receive path. There are 64 gain steps from mute to
+6 dB.
10.3
Voice band digital circuitry
The voice band digital circuitry is responsible for
converting a 16-bit PCM signal at 8 kHz sample rate to and
from a 1-bit 1 MHz signal. It also contains a band-pass
filter for 300 to 3400 Hz and a sidetone engine. Various
volume settings are calculated inside this block. Figure 7
shows the block diagram of the voice band signal
processor.
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