S DC-6 3 0 /6 3 2 /6 3 4 * A/S T
1 0 -, 1 2 -, OR 1 4 -BIT S YNCHRO-TO-DIGITAL/
RES OLVER-TO-DIGITAL CONVERTER
LOWER COST! PIN-FOR-PIN REPLACEMENT FOR
SDC-630/632/634 SERIES. FOR ALL NEW DESIGNS!
FEATURES
DESCRIPTION
APPLICATIONS
Low Cost Pin-for-Pin
•
The SDC-630/632/634 A/ST series These converters may be used wher-
are low cost, low profile synchro-to- ever analog angle data from a syn-
digital (S/D) and resolver-to-digital chro or resolver must be rapidly and
(R/D) tracking converters with stan- accurately converted to digital form
dard pin configurations. They use a for transmission, storage or analysis.
unique control transformer algorithm Because these units are extremely
that provides inherently higher accu- rugged and stable, and meet the
racy and jitter-free output. Utilizing a requirements on MIL-STD-202E, they
type II servo loop, these converters are suitable for the most severe
have no velocity lag up to the speci- industrial, commercial and military
fied tracking rate, and output data is applications. Military ground support
always fresh and continuously avail- and avionics uses include ordnance
able. Each unit is fully trimmed and control, radar tracking systems, navi-
requires no adjustment or field cali- gation and collision avoidance sys-
Replacement
for SDC-630/632/634 Series
Industry Standard Low Profile
Modular Converters
•
•
Accuracy:
10 Bit: 21 Minutes
12 Bit: 8.5 Minutes
14 Bit: 4 Minutes, 0.9 LSB or
2.6 Minutes (High Accuracy)
bration.
tems.
Options (Consult Factory):
Velocity Input
•
BIT: Built-In-Test
16-Bit Resolution
INPUT OPTIONS
RESISTOR (ST)
DIVIDER
SYNCHRO INPUT OPTION (A)
S1
S2
S3
θ
SIN
SCOTT-T
VEL
TRANSFORMER
θ
COS
VELOCITY
ERROR
PROCESSOR
AND
REFERENCE (A)
ISOLATION
RH
RL
(OPTIONAL)
INH
INHIBIT
REF
DEMODULATOR
)
− φ
(θ
SIN
VOLTAGE
TRANSFORMER
RESOLVER INPUT OPTION (A)
CONTROLLED
OSCILLATOR
CB
S1
S2
S3
S4
CONVERTER
BUSY
RESOLVER
ISOLATION
TRANSFORMER
θ
SIN
− φ)
(θ
COS
ω t
SIN
θ
COS
θ
SIN
INPUT
OPTION
SYNCHRO INPUT OPTION (ST)
SOLID STATE
CONTROL
θ
COS
UP-DOWN COUNTER
(CONTAINS ANGLE φ
SOLID STATE
SCOTT-T
BUFFER
θ
S1
S2
S3
SIN
TRANSFORMER
(CT)
)
θ
COS
RESOLVER INPUT OPTION (ST)
BIT
1
S1
S2
S3
S4
SOLID STATE
RESOLVER
BUFFER
θ
SIN
θ
COS
BIT 10,
12 OR 14
BIT
1
BIT 10, 12, OR 14
(LSB)
(MSB)
FIGURE 1. SDC-630/632/634 A/ST BLOCK DIAGRAM
* Patented
1993, 1999 Data Device Corporation
©