CML Semiconductor Products
PRODUCT INFORMATION
FX629
Features/Applications
Designed to Meet Mil-Std-188-113
Military Communications
Delta MUX, Switch and Phone
Applications
Single-Chip Full-Duplex Codec
On-Chip Input and Output Filters
DATA ENABLE
ENCODER FORCE IDLE
Delta Modulation Codec
Publication D/629/2 July 1994
Provisional Issue
Programmable Sampling Clocks
3 or 4-bit Compand Algorithm
Forced Idle Facility
Powersave Facility
Single 5V CMOS Process
Full-Duplex CVSD* Codec
ENCODER INPUT
V
DD
V
SS
XTAL/CLOCK
XTAL
ENCODER DATA CLOCK
DECODER DATA CLOCK
V
BIAS
MODE 1
MODE 2
ALGORITHM
POWERSAVE
DECODER INPUT
DEMOD
DECODER OUTPUT
DECODER FORCE IDLE
CLOCK MODE
LOGIC
SAMPLING RATE
CONTROL
MOD
ENCODER OUTPUT
f
1
f
0
CLOCK RATE
GENERATORS
f
2
FX629
3 or 4-BIT
f
3
f
1
Fig.1 Internal Block Diagram
Brief Description
The FX629 is an LSI circuit designed as a
*Continuously Variable Slope Delta Codec and
is intended for use in military communications
systems.
Designed to meet Mil-Std-188-113 with
external components, the device is suitable for
applications in military Delta Multiplexers,
switches and phones.
Encoder input and decoder output filters are
incorporated on-chip. Sampling clock rates can
be programmed to 16, 32 or 64 k bits/second
from an internal clock generator or may be
externally applied in the range 8 to 64 k bits/
second. Sampling clock frequencies are output
for the synchronization of external circuits.
The encoder has an enable function for use in
multiplexer applications.
Encoder and Decoder forced idle facilities are
provided, forcing a 10101010..... pattern in
encode and a V
DD
/2 bias in decode.
The companding circuits may be operated with
a pin-selected 3 or 4-bit algorithm.
The powersave facility puts the device into the
standby mode thereby reducing current
consumption when not operating.
A reference 1.024MHz oscillator uses an
external clock pulse or Xtal input.
The FX629 is a low-power, 5 volt CMOS
device and is available in 22-pin cerdip DIL
package.
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