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070802

Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple

revisions of any device may be simultaneously available through various sales channels. For information about device errata,

click here: http://www.maxim-ic.com/errata.

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 375ms

§ Simple serial port used to configure the

device

§ On-board 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

§ Single +5V supply; low-power CMOS

technology

§ Available in 28-pin PLCC

§ 3V operation version is available

(DS2165QL)

PIN ASSIGNMENT (Top View)

DESCRIPTION

The DS2165Q ADPCM processor chip is a dedicated digital-signal-processing (DSP) chip that has been

optimized to perform adaptive-differential pulse-code modulation (ADPCM) speech compression at three

different rates. The chip can be programmed to compress (expand) 64kbps voice data down to (up from)

either 32kbps, 24kbps, or 16kbps. The compression to 32kbps follows the algorithm specified by CCITT

Recommendation G.721 (July 1986) and ANSI document T1.301 (April 1987). The compression to

24kbps follows ANSI document T1.303. The compression to 16kbps follows a proprietary algorithm

developed by Dallas Semiconductor. The DS2165Q can switch compression algorithms on-the-fly. This

allows the user to make maximum use of the available bandwidth on a dynamic basis.

28-Pin PLCC

NC

A0

A1

A2

A3

A4

FSY

YOUT

CS

SDI

SCLK

XOUT

A5

NC

25

24

23

22

21

20

19

5

6

7

8

9

10

11

4

3

2

1

28

27

26

12

13 14

15

16 17 18

www.maxim-ic.com

DS2165Q

16/24/32kbps ADPCM Processor

DS2165Q