
SD-14595/96/97
SYNCHRO/RESOLVER-TO-DIGITAL
CONVERTERS
DESCRIPTION
The SD-14595 is a low-cost, high
reliability, synchro- or resolver-to-dig-
ital converter with 14-bit-only, 16-bit-
only or pin programmable 14-bit or
16-bit resolution. Packaged in a 36-
pin DDIP, the SD-14595/96/97 series
feature Built-In-Test (BIT) output.
The SD-14595/96/97 series accepts
broadband inputs: 360 to 1 kHz. Other
features are solid-state signal and ref-
erence isolation and high common
mode rejection. In addition, the SD-
14596 and SD-14597 are pin-for-pin
replacements for the Natel 1044 and
1046, respectively.
The digital angle output from the
SD-14595/96/97 is a natural binary
code, parallel positive logic and is
TTL/CMOS
compatible. The
SD-
14595/96/97 accomplishes synchro-
nization to a computer with the
Converter Busy (CB) output and/or the
Inhibit (INH) input.
APPLICATIONS
Because of its high reliability, small
size, and low power consumption, the
SD-14595/96/97 is ideal for military
ground or avionics applications. All
models are available with MIL-PRF-
38534 processing.
Designed with three-state output, the
SD-14595/96/97 is especially well-
suited for use with computer based
systems. Among the many possible
applications are radar and navigation
systems, fire control systems, flight
instrumentation, and flight trainers or
simulators.
FEATURES
Accuracy to 1.3 Arc Minutes
Pin Programmable 14 Bit/16 Bit,
14 Bit Only or 16 Bit Only
No 180° False Lock-up
Internal Synthesized Reference
Built-In-Test (BIT) Output
Low Power
Pin-for-Pin Replacement for
Natel’s 1044 and 1046
HIGH
ACCURACY
CONTROL
TRANSFORMER
GAIN
DEMODULATOR
ERROR
PROCESSOR
VCO
16 BIT
UP/DOWN
COUNTER
U
T
VEL
D
SIN
(
θ-φ)
e
SIN
θ
COS
θ
3 STATE
TTL BUFFER
3 STATE
TTL BUFFER
VOLTAGE
DOUBLER
INHIBIT
TRANSPARENT
LATCH
16 BIT CT
TRANSPARENT
LATCH
16 BIT OUTPUT
TRANSPARENT
LATCH
EDGE
TRIGGERED
LATCH
DIGITAL
ANGLE
φ
Q
+8.6 V
INH
BITS 1-8
HBE
50 ns DELAY
RESOLUTION
CONTROL
1 LSB ANTIJITTER FEEDBACK
LOS
SYNTHESIZED
REF
REFERENCE
CONDITIONER
BIT DETECT
RH
RL
REF IN
LOS
ANALOG RETURN
V(+4.3 V)
V
+5 V
14B
LBE
BITS 9-16
T
U
INH
R
E
CB
VEL
e
BIT
(14595 ONLY)
S1
S2
S3
SOLID STATE SYNCHRO INPUT OPTION
ELECTRONIC
SCOTT T
SIN
θ
COS
θ
S1
S2
S3
SOLID STATE RESOLVER INPUT OPTION
RESOLVER
CONDITIONER
SIN
θ
COS
θ
S4
DIRECT INPUT OPTION
VOLTAGE
FOLLOWER
BUFFER
SIN
θ
COS
θ
SIN
θ
COS
θ
INPUT OPTIONS
V
INTERNAL
DC
REFERENCE
INPUT OPTION
1997, 1999 Data Device Corporation
FIGURE 1. SD-14595/96/97 BLOCK DIAGRAM