OSC-15801
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®
SYNCHRO/RESOLVER/INDUCTOSYN
®
REFERENCE OSCILLATOR
FEATURES
•
Quadrature Reference Output
Voltages for Inductosyn Applications
•
Programmable Output Frequency
from 400 Hz to 20 kHz
•
Small 18-Pin DDIP
•
Scalable Reference Output
•
-55°C to 125°C Operating
Temperature Range
•
Rad Tolerant Option Available,
Contact Factory
DESCRIPTION
The OSC-15801 is a quadrature power oscillator with two outputs that
are 90° out of phase. These outputs provide both the reference and
quadrature signals, simultaneously, making the OSC-15801 ideally
suited for Inductosyn applications.
The oscillator’s outputs are pin-programmable for both frequency and
amplitude. The output frequency can be programmed from 400 Hz to
20 kHz by simply connecting two external capacitors. The Reference
output voltage, 8.8 Vrms at 20 kHz, can be scaled down by connect-
ing a single resistor.
APPLICATIONS
Packaged in an 18-pin hermetic DDIP, the OSC-15801 operates over
a temperature range of -55°C to +125°C. This, combined with its small
size and programmable output voltage and frequency capabilities,
makes it an excellent choice for use in Inductosyn applications.
FOR MORE INFORMATION CONTACT:
Data Device Corporation
105 Wilbur Place
Bohemia, New York 11716
631-567-5600 Fax: 631-567-7358
www.ddc-web.com
Technical Support:
1-800-DDC-5757 ext. 7771
All trademarks are the property of their respective owners.
©
®
1981, 1999 Data Device Corporation
Inductosyn is a registered trademark of Farrand Controls Corporation
Data Device Corporation
www.ddc-web.com
REF OUT -90˚
Cext
C1
Rext
REF
OUT
30k
-
+
PA OUT
PA IN
30k
+15 VDC
2
GND
QUAD OSCILLATOR
-15 VDC
C2
C2
GND
Cext
INVERTING AMP
OSC-15801
N-9/09-0
FIGURE 1. OSC-15801 BLOCK DIAGRAM
TABLE 1. OSC-15801 SPECIFICATIONS
Specifications apply over temperature range and power supply range.
PARAMETER
FREQUENCY
OUTPUTS
(Note 1)
PA OUT
Voltage
Continuous Current
Protection
REF
Voltage
Continuous Current
Protection
REF -90°
Voltage
Continuous Current
Protection
Output Impedance
POWER SUPPLIES
Voltage
Current
Max Voltage without damage
TEMPERATURE RANGE
Operating
-10X
-30X
Storage
JC (Junction to Case)
PHYSICAL CHARACTERISTICS
Size
Package Type
Weight (Max)
UNITS
Hz
Programmable from 400 to 20k
VALUE
V rms
mA rms
6.2 to 8.8
215 max
Momentary short circuit (1 sec. max.)
6.2 to 8.8
3 max
Momentary short circuit (5 sec. max.)
(Note 2)
3 max
Momentary short circuit (5 sec. max.)
0.87 (typ)
V rms
mA rms
V rms
mA rms
Ω
Vdc
mA
Vdc
±15 ±5%
15 max plus current load
±18
°C
°C
°C
°C/W
-55 to +125
0 to +70
-65 to +150
8
in
(mm)
oz
(gm)
1.0 x 0.8 x 0.2
(25.45 x 20.32 x 4.83)
18-pin DDIP
0.4
(11.3)
Notes:
1. Output voltage tracks ±15 V supply levels.
2. Clipped sine wave for demodulator drive only, 10 Vrms typ.
Data Device Corporation
www.ddc-web.com
3
OSC-15801
N-9/09-0
OSC-15801 OPERATION
PROGRAMMABLE FREQUENCY OUTPUT
The output frequency of the OSC-15801 is programmable from
20 kHz down to 400 Hz. The frequency is programmed using two
external equal value capacitors (see FIGURE 2). The value of
the capacitors (C
ext
) is calculated as follows:
C
ext
= (2,400,000/f) - 100
where: C
ext
is capacitance in picofarads,
f is frequency in Hertz.
To scale down the PA OUT voltage, an external resistor (R
ext
) is
connected between pins 3 and 7. The value of R
ext
is calculated
as follows:
R
ext
= 30 [(PA OUT/desired voltage) -1]
where: R
ext
is in kOhms,
desired voltage is in Vrms,
PA OUT is dependent on frequency used.
FOR EXAMPLE,
to scale down PA OUT to 5 Vrms at 10 kHz, the
value of R
ext
would be calculated as follows:
R
ext
= 30 [(PA OUT/desired voltage) -1]
R
ext
= 30 [(7.5/5) -1]
R
ext
= 15kΩ
For connection to converters connect as follows:
Ref Lo (RL) connect to pin 16
Ref Hi (RH) connect to pin 13 or 12.
TYPICAL PROGRAMMABLE REFERENCE VOLTAGE
OUTPUT (R
EXT
= 0)
The PA OUT (REF), pin 13, provides from 7.0 to 7.3 Vrms,
depending on the operating frequency. TABLE 2 lists the PA
OUT voltages at the (programmed) operating frequency. These
voltages are typical voltage values obtained at these frequen-
cies, when R
ext
= 0 Ohms (pin 7 jumped to pin 3).
TABLE 2. PA OUT/FREQUENCY
PA OUT
7.3 Vrms
7.1 Vrms
7.0 Vrms
FREQUENCY
20 kHz
10 kHz
.4 kHz
+15 V
18
C2
RL
16
-15 V
15
12
REF OUT -90˚
(RH
2
)
1,3
11
Cext
10
6
Cext
7
C2
C1
OSC-15801
13
PA OUT (REF)
(RH
1
)
1,3
REF OUT
2
PA IN
3
Rext
Notes:
1. Output Low side is pin 16 "gnd"
2. Pin 7. REF OUT is the unbuffered output of
the oscillator
3. RH
1
= Typical connection to RD converter
Ref Hi.
RH
2
= Low power -90 degree phase shifted
signal for use with inductosyns.
FIGURE 2. PROGRAMMING RESISTOR AND CAPACITOR CONNECTIONS
Data Device Corporation
www.ddc-web.com
OSC-15801
N-9/09-0
4
TABLE 3. OSC-15801 PIN FUNCTIONS
PIN
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
NC
NC
PA IN
NC
NC
C1
REF OUT
NC
NC
C2
C2 GND
REF OUT -90°
PA OUT
NC
-15 V
GND
NC
+15 V
NAME
No connection1
No connection1
Power amplifier inverting input
No connection1
No connection1
Capacitor connection (pin-programmable frequency)
Reference output
No connection1
No connection1
Capacitor connection (pin-programmable frequency)
Capacitor connection (pin-programmable frequency)
-90° reference output signal
Power amplifier output
No connection1
-15 Vdc power supply voltage
Ground
No connection1
+15 Vdc power supply voltage
FUNCTION
NOTES:
1. NC = No connection to anything inside chip (open pin).
1.002 MAX
(25.45)
18
10
0.800
MAX
(20.32)
0.600
(15.24)
1
0.035 TYP
(0.89)
PIN 1 INDEX
TOP VIEW
9
0.190
MAX (4.83)
0.010 ±0.002
TYP
(0.25 ±0.05)
SIDE VIEW
NOTES:
1. Dimensions shown are in inches (mm).
2. Lead cluster shall be centralized
within ±0.010 (±2.54) of outline dimensions.
3. Pin material meets solderability
requirements of MIL-STD-202E,
Method 208C.
4. Pin numbers are for reference only.
0.180 minimum
(4.57)
0.018 ±0.002
(0.46 ±0.05)
0.100 TYP
(2.54)
0.040 TYP
(1.02)
8 EQ. SP. @ 0.100 = 0.800
TOL NONCUM
(@ 2.54 = 20.32)
FIGURE 3. OSC-15801 MECHANICAL OUTLINE
Data Device Corporation
www.ddc-web.com
5
OSC-15801
N-9/09-0
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