DS2167 Datasheet, PDF (1/15 Pages) Dallas Semiconductor – ADPCM Processor

DS2167/DS2168
DS2167/DS2168
ADPCM Processor
FEATURES
• Speech compression chip compatible with standard
ADPCM algorithms:
– DS2167 supports “new” T1Y1 recommenda-
tions (July 1986) and “new” CCITT G.721 rec-
ommendations
– DS2168 supports “old” CCITT G.721 recom-
mendations
• Dual independent channel architecture – device may
be programmed to perform full duplex, 2-channel ex-
pansions, or 2-channel compressions
• Interconnects directly with µ-law or A-law codec/filter
devices
• Serial PCM and control port interfaces minimize “glue
logic” in multiple channel applications
– On-chip channel counters identify input and out-
put timeslots in TDM-based systems
– Unique addressing scheme simplifies device
control; 3-wire port shared among 64 devices
– Bypass and idle features allow dynamic alloca-
tion of channel bandwidth, minimize system
power requirements
• Hardware mode intended for stand-alone use
– No host processor required
– Ideal for voice mail applications
• 28-pin surface-mount package available, designated
DS2167Q/DS2168Q
PIN ASSIGNMENT
RST 1
TM0 2
TM1 ₃
A0 ₄
A1 5
A2 ₆
A3 ₇
A4 ₈
A5 9
SPS 10
MCLK 11
VSS 12
24 ^VDD
23
YIN
22
CLKY
21
FSY
20 YOUT
19 ^CS
18 SDI
17 SCLK
16 XOUT
15 FSX
14 CLKX
13 XIN
24-Pin DIP (600 MIL)
NC 5 4 3 2 1 28 27 2625 FSY
A0 6
24 YOUT
A1 7
23 CS
A2 8
22 SDI
A3 9
21 SCLK
A4 ₁₀
20 ^XOUT
A5
11
12 13 14 15
16 17 1819
NC
28-Pin PLCC
DESCRIPTION
The DS2167 and DS2168 are dedicated digital signal
processor (DSP) CMOS chips optimized for Adaptive
Differential Pulse Code Modulation (ADPCM) based
compression algorithms. The devices halve the trans-
mission bandwidth of “toll quality” voice from 64K to 32K
bits/second and are utilized in PCM-based telephony
networks.
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