MX93000 Datasheet, PDF (1/24 Pages) Macronix International – Special Codec

MX93000
FEATURES
• 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
PIN CONFIGURATION
28PIN SOP/DIP
SDATA 1
SDEN\ 2
DX 3
DR 4
FS 5
MCLK 6
VDD 7
GND 8
PRST 9
BAT\ 10
VBAT 11
PDN\ 12
VPOW 13
LIN 14
28 SPK
27 VR
26 VREF
25 FILT
24 ALCC
23 ALCRC
22 PGAC
21 AUX
20 MIC
19 AG
18 AGND
17 AVDD
16 LOUT2
15 LOUT1
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.
P/N: PM0306
1
REV. 3.0, JUL 15, 1996