Rainbow Electronics DS2165Q - 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.
DS2165/DS2165Q
16/24/32Kbps ADPCM Processor
DS2165/DS2165Q
041295 1/17
FEATURES
•
Compresses/expands 64Kbps PCM voice to/from
either 32Kbps, 24Kbps, or 16Kbps
•
Dual, fully independent channel architecture; device
can be programmed to perform either:
– two expansions
– two compressions
– one expansion and one compression
•
Interconnects directly to combo-codec devices
•
Input to output delay is less than 375 µ s
•
Simple serial port used to configure the device
•
Onboard Time Slot Assigner Circuit (TSAC) function
allows data to be input/output at various time slots
•
Supports Channel Associated Signaling
•
Each channel can be independently idled or placed
into bypass
•
Available hardware mode requires no host processor;
ideal for voice storage applications
•
Backward-compatible with the DS2167 ADPCM
Processor Chip
•
Single +5V supply; low-power CMOS technology
•
Available in 24-pin DIP and 28-pin PLCC
PIN ASSIGNMENT
1
2
3
4
5
6
7
8
9
10
11
12 13
14
15
16
17
18
19
20
21
22
23
24
24-Pin DIP (600 MIL)
RST
TM0
TM1
A0
A1
A2
A3
A4
A5
SPS
MCLK
VSS
VDD
YIN
CLKY
FSY
YOUT
CS
SDI
SCLK
XOUT
FSX
CLKX
XIN
27 28 26 4 3 2 5
6
7
8
9
12 13 14 15 16 17 18
25
24
23
22
21
20
19
10
11
FSY
YOUT
CS
SCLK
SDI
XOUT
NC
NC
A0
A1
A2
A3
A4
A5
1
TM1 RST
NC
VDD YIN
CLKX
XIN FSX SPS
MCLK
VSS
TM0 NC CLKY
28-Pin PLCC
A 3–volt Operation Version
is Available (DS2165QL)
DESCRIPTION
The DS2165 ADPCM Processor Chip is a dedicated
Digital Signal Processing (DSP) chip that has been opti-
mized to perform Adaptive Differential Pulse Code Mod-
ulation (ADPCM) speech compression at three different
rates. The chip can be programmed to compress (ex-
pand) 64Kbps voice data down to (up from) either
32Kbps, 24Kbps, or 16Kbps. The compression to
32Kbps follows the algorithm specified by CCITT Rec-
ommendation G.721 (July 1986) and ANSI document T1.301 (April 1987). The compression to 24Kbps fol-
lows ANSI document T1.303. The compression to
16Kbps follows a proprietary algorithm developed by
Dallas Semiconductor. The DS2165 can switch com-
pression algorithms on-the-fly. This allows the user to
make maximum use of the available bandwidth on a dy-
namic basis.