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MX93000CSC Datasheet

  • MX93000CSC

  • A-Law/u-Law/Linear CODEC

  • 24頁

  • ETC

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MX93000
FEATURES
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Single +5V power supply
Sigma-Delta A/D D/A with digital filters
Support u/A Law and 16-bit linear format
On-chip automatic level control
On-chip differential line driver
On-chip digital volume control
Programmable transmit/receive gain control
Support switch paths for DAM (Digital Answering
Machine) applications
Easy interface to general purpose DSPs
Easy read/write of control register by microproces-
sors
Programmable power-down
Support power-low/battery-low detection
28-pin DIP/SOP package
PRODUCT OVERVIEW
The MX93000 Special Codec integrates key functions
of the analog-front-end of Digital Answering Machine
(DAM) into a single integrated circuit. The MX93000 is
intended to provide a complete, low cost, and single
chip solution for telephone applications requiring a
single +5V power supply.
The MX93000 Special Codec is especially powerful
when applied to some DAM models which are intended
to meet different countries' specifications in the same
system hardware. User can achieve this goal by
simply setting control firmware. This benifit will help
DAM system makers to save developing time and R/D
resources.
The A/D D/A converters are implemented with 2nd-
order sigma-Delta modulators. The on-chip digital
filters, which are carried out with 16-bit and 2's
complement format, are used to get the required
frequency response of a PCM Codec. The Codec can
support 8-bit u/A law and linear format. For the latter,
it is 16-bit format with 14-bit resolution .
Before the A/D digitizing the voice-band analog signal
into digital format, the analog signal can be processed
by a built-in Automatic Level Control (ALC) and pro-
grammable Gain Amplifier (PGA). The ALC circuit
controls the input level of A/D converter to about 1.5
Volt, so as to get a better signal to noise ratio during a
low-level input. The PGA circuit is used to control the
gain of different sources : microphone, aux or line
input.
After the digital data is converted into analog signal by
the D/A converter, a fully differential line driver is
supported to drive the telephone line directly without
the need of external amplifier. On the other hand, the
analog signal can be monitored by passing the analog
signal to the on-chip volume control circuit, which can
drive an external driver like LM386.
In addition, the MX93000 supports switches and
control registers so that users can program the Special
Codec to be under line operations and all other specific
operations of DAM. To enhance an easy read/write of
control registers by microprocessors, the control data
is clocked by the 8 kHz sampling clock and synchro-
nized by SDEN\, where SDEN\ is coming from the
output port of microprocessor by detecting one of the
rising edge of 8 kHz clock.
PIN CONFIGURATION
28PIN SOP/DIP
SDATA
SDEN\
DX
DR
FS
MCLK
VDD
GND
PRST
BAT\
VBAT
PDN\
VPOW
LIN
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
SPK
VR
VREF
FILT
ALCC
ALCRC
PGAC
AUX
MIC
AG
AGND
AVDD
LOUT2
LOUT1
MX93000
P/N: PM0306
1
REV. 3.0, JUL 15, 1996

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