Rainbow Electronics DS2132A_Q - Manual

E Copyright 1995 by Dallas Semiconductor Corporation.
All Rights Reserved. For important information regarding
patents and other intellectual property rights, please refer to
Dallas Semiconductor data books.
DS2132A/Q
Digital Answering Machine Processor
DS2132A/Q
041295 1/17
FEATURES
•
Two high quality speech compression algorithms per-
mit either 7 or 14 minutes of speech storage in a single
4 Mbit DRAM or ARAM
•
Economical three-wire data/control/status port frees
up microcontroller port pins
•
Detects and generates the 12 standard DTMF tones
plus the A/B/C/D tones
•
Detects CCITT T.30 FAX calling tone (1100 Hz)
•
Generates musical tones which allow “melodies-on-
hold” or customizable prompts
•
Echo cancellation for improved DTMF receiver per-
formance
•
Precise signal level detection capability
•
Record/Playback gain control
•
28-pin DIP or PLCC (DS2132AQ) packages
There is a series of Application Notes
that accompany this data sheet.
PIN ASSIGNMENT
27 28 26 4 3 2 5
6
7
8
9
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
12 13 14 15 16 17 18
25
24
23
22
21
20
19
10
11
PD
GND
GND
PD
VCC
MCLK
PCMIN
CLK
FS
PCMOUT
TRI_IN
CDOUT
TRI_OUT
CDIN
RST
VCC
VCC
VCC
VCC
VCC
GND
GND NC
GND
GND
FS
CLK
VCC
FS
PCMOUT
TRI_IN
GND
GND
CDOUT
TRI_OUT
PD
VCC
VCC
VCC
VCC
VCC
VCC
1
GND RST
NC
VCC PCMIN
CLK
CDIN
FS
GND
MCLK
GND
GND PD CLK
DS2132A 28-PIN DIP
600 MIL
DS2132AQ 28-PIN
PLCC
DESCRIPTION
The DS2132A Digital Answering Machine Processor is
a Digital Signal Processor (DSP) optimized for the com-
pression/expansion of PCM coded voice to/from an ex-
tremely low bit rate. The DS2132A contains two ad-
vanced speech compression algorithms that offer
outstanding fidelity. The Standard Record/Playback al-
gorithm compresses speech to 9.8Kbps and the Ex-
tended Record/Playback algorithm compresses
speech to 4.9Kbps.
The DS2132A is ideal for embedded applications such
as digital answering machines, voice mail, voice annun-
ciators, and any other device that needs to maximize
speech storage in a limited memory space. A simple
three wire interface to the embedded microcontroller
frees up valuable controller port pins for other uses and
simplifies the software needed to transfer speech data,
issue commands, and receive DTMF/energy level/sta-
tus information. The DS2132A detects and generates
all 16 DTMF tones and can also generate a wide variety
of call progress tones. In addition, the DS2132A pro-
vides CCITT Rec. T.30 FAX calling tone detection which
enables the answering machine to determine if the in-
coming call is a voice or FAX transmission. The energy
level detector allows the microcontroller to perform call
progress detection and automatic gain control func-
tions.