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SWR200
Precision Sine Wave Reference
THALER CORPORATION * 2015 N. FORBES BOULEVARD * TUCSON, AZ. 85745 * (520) 882-4000
FEATURES
* VERY HIGH ACCURACY: 7.071 Vrms 0.05% * EXTREMELY LOW DRIFT: 3 ppm/C (-55C to +125C) * EXCELLENT STABILITY: 10 ppm/1000 Hrs. Typ. * LOW DISTORTION: 0.1% THD @ f = 3300 Hz * HERMETIC 14-PIN CERAMIC DIP * MILITARY PROCESSING OPTION
APPLICATIONS
* TRANSDUCER EXCITATION * HIGH RESOLUTION SERVO SYSTEMS * HIGH PRECISION TEST and MEASUREMENT INSTRUMENTS * AC VOLTAGE STANDARD * LVDT OR RVDT REFERENCE * MULTIPLYING D/A REFERENCE
DESCRIPTION
SWR200 is a Precision Sine Wave Reference providing an ultra stable sine wave output of 7.071V at 0.05% initial accuracy and temperature coefficient as low as 3 ppm/C over the full military temperature range. The extreme accuracy is made possible by a chopper-based AGC circuit. The temperature characteristic of the chopper circuit compensates the typical nonlinearity of the internal DC zener reference, resulting in a nearly linear amplitude-temperature characteristic. Frequency of the SWR200 is programmable with two external capacitors. The SWR200 is available in a 14-pin bottom braze package. They are hermetically sealed and "M" versions are screened for high reliability and quality. SWR200 is well suited for any application requiring a stable sine wave source. The SWR200 can be used as a reference source in precision sensing systems based on LVDT or RVDT position sensors. A programmable AC reference can be constructed using the SWR200 as a reference for a high accuracy multiplying Digital to Analog Converter.
SWR200DS REV. D JUNE 1995
SELECTION GUIDE
Type Output Temperature (Typ.) Operating Range 7.071V -25C to +85C Package DIP
SWR200C
SWR200M
7.071V -55C to +125C
DIP
ELECTRICAL SPECIFICATIONS
Vps =15V, T = 25C, RL = 10K unless otherwise noted.
SWR200
M
MIN TYP MAX MIN TYP MAX MIN TYP MAX
MODEL PARAMETERS
MIN
C
TYP MAX
UNITS
ABSOLUTE MAXIMUM RATINGS Power Supply 13.5 15 22 Operating Temperature -25 85 Storage Temperature -65 150 Short Circuit Protection Continuous OUTPUT VOLTAGE OUTPUT VOLTAGE ERRORS Initial Error Warmup Drift DC Offset DC Offset Over Temp. Tmin - Tmax Long-Term Stability OUTPUT CURRENT Range REGULATION Line Load POWER SUPPLY CURRENTS +PS -PS DISTORTION FREQUENCY
Range (f) f= 10 -5
* -55 * * *
* 125 *
V C C Vrms
7.071
0.05 100 3 1 10 3 18 2.0 * * 1 *
* * * 3.0
% V mV V/C ppm/C ppm/C
10
*
mA
10 3
* *
ppm/V ppm/mA
10.5 9.5
13 13 0.5
* *
* * *
mA mA %
C1 C2 f vs. Temperature
.98 400
1
f
1.02 10K 15
*
*
* * *
Hz Hz ppm/C
NOTES: *Same as C Models. 1.Using the box method, the specified value is the maximum deviation from the output voltage at 25C over the specified operating temperature range. 2.The specified values are unloaded.
3.Pin 8 is internally connected to Pin 7 and can be used as Ref. GND. 4. The frequency range can be extended to any desired lower value by using 2 external AGC capacitors (see AN-3). 5.The increase in distrotion at lower frequencies can be eliminated by using external AGC capacitors (see AN-3).
SWR200DS REV. D JUNE 1995
TYPICAL PERFORMANCE CURVES
VOUT vs. TEMPERATURE VOUT vs. TEMPERATURE % FREQ. vs. TEMP. % FREQ. vs. TEMP.
Temperature oC SWR200C
Temperature oC SWR200L
Temperature oC SWR200C
Temperature oC SWR200L
DISTORTION VS. TEMP
DISTORTION vs. FREQUENCY
NORMALIZED DISTORTION vs. C2/C1
Temperature oC
Frequency (Hz)
C2/C1
POWER SUPPLY CURRENT vs. TEMP.
CASE TEMP. RISE ABOVE AMBIENT vs. OUTPUT CURRENT
JUNCTION TEMP. RISE ABOVE CASE TEMP. vs OUTPUT CURRENT
Temperature oC
Output Current (mA)
Output Current (mA)
SWR200DS REV. D JUNE 1995
DISCUSSION OF PERFORMANCE
THEORY OF OPERATION The following refers to the schematic in Figure 1. A1 and A2 are connected as a phase-shift oscillator circuit with the frequency set by the external capacitors C1 and C2. Q4 is included in the feedback loop of A1 as a gain control element. The oscillator output is fed to the chopper amplifier which develops an absolute value representation of the oscillator output. The chopper output is compared to a precision DC reference in integrator amplifier A3. This DC error signal is used ot control the gain setting FET Q4. As in all precision zener based DC references, the drift of the zener becomes nonlinear at temperature extremes. The chopper amplifier drift characteristic is complementary to this nonlinearity and compensates for the reference drift.
APPLICATION INFORMATION Figure 1 shows the connections for the SWR200 including the two frequency setting capacitors. The frequency is:
-5
f=
10 C1 C 2
The frequency stability is directly related to the stability of the capacitors, therefore stable capacitors like NPO ceramic, or polycarbonate or polystyrene film should be used. Two separate ground pins are provided for accurate ground sensing. This minimizes errors due to drops in the ground pin which can become a significant source of error in sockets. The offset of the SWR200 is fully specified for initial offset and drift and is low enough that it can normally be neglected. In applications which are especially sensitive to offset the output can be AC coupled. Proper capacitor sizing and high impedance sensing will minimize errors due to capacitive coupling.
SCHEMATIC
FIGURE 1
SWR200DS REV. D JUNE 1995
EXTERNAL CONNECTIONS
FIGURE 2
PIN CONFIGURATION
TOP VIEW
C1 C1 -PS NC NC NC GND C2 C2 +PS
SWR200
NC NC OUTPUT GND SENSE
MECHANICAL
14-PIN HYBRID PACKAGE
INCHES DIM E L D B B1 B2 S P MIN .480 .195 .775 .016 .038 .095 .085 .004 MAX .500 .215 .805 .020 .042 .105 .105 .006 MILLIMETER MIN 12.1 4.9 19.7 0.4 0.9 2.4 2.1 0.10 MAX 12.7 5.4 20.4 0.5 1.0 2.6 2.6 0.15 DIM A Q Q1 C G1 INCHES MIN .120 .015 N/A .009 .290 MAX .155 .035 .030 .012 .310 MILLIMETER MIN MAX 3.0 0.4 N/A 0.2 7.3 4.0 0.9 0.7 0.3 7.8
SWR200DS REV. D JUNE 1995

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