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SWR200 SWR200
DESCRIPTION
Precision Sine Wave Reference
FEATURES
Very High Accuracy: +7.071 Vrms 0.5% Extremely Low Drift: 20 ppm/C (-55C to +125C) Excellent Stability: 10 ppm/1000 Hrs. Typical Low Distortion: 0.1% Thd @ f = 3300 Hz Hermetic 14-pin Ceramic DIP Military Processing Option
SWR200 is a Precision Sine Wave Reference providing an ultra stable sine wave output of +7.071 V at 0.5% initial accuracy and temperature coefficient as low as 20 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.
APPLICATIONS
Transducer Excitation High Resolution Servo Systems High Precision Test and Measurement Instruments AC Voltage Standard LVDT Or RVDT Reference Multiplying D/A Reference
Figure 1. BLOCK DIAGRAM
+15V +15V +15V
-15V
-15V
-15V
+15V
3
12
SWR200DS
www.cirrus.com
Copyright (c) Cirrus Logic, Inc. 2010 (All Rights Reserved)
MAY 2010 1 APEX - SWR200DSREVH
SWR200
SELECTION GUIDE
Type SWR200C SWR200M Output (Typ.) +7.071V +7.071V
Product Innovation From
Temperature Operating Range -25C to +85C -55C to +125C
Package DIP DIP
1. CHARACTERISTICS AND SPECIFICATIONS ELECTRICAL SPECIFICATIONS
VPS =15V, T = +25C, RL = 10K UNLESS OTHERWISE NOTED. Model Parameter
ABSOLUTE MAXIMUM RATINGS Power Supply Operating Temperature Storage Temperature Short Circuit Protection 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 10.5 9.5 13 13 0.5 .98 400 1 1.02 10K 15 * * 10 3 10 * 10 3 100 3 18 20.0 0.5 13.5 -25 -65 Continuous 7.071 15 22 +85 +85 * -55 *
Hermetic 14-pin Ceramic DIP Package Style HC SWR200M
SWR200C Min Typ Max Min
Typ
*
Max
* +125 *
Units
V C C Vrms V
* * * * * * * * 30.0
% V mV V/ C ppm/ C ppm/ C mA
* * * * * * * * * * *
ppm/V ppm/mA mA mA % Hz Hz ppm/C
10-5 Range (f) f = C C 1 2 f vs. temperature f
2
SWR200DS
Product Innovation From
SWR200
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).
2. TYPICAL PERFORMANCE GRAPHS
VOUT vs. TEMPERATURE
20 15.6 0 -15.6 -20 50 35 0 -35 -50
VOUT vs. TEMPERATURE
% FREQ. vs. TEMP.
% FREQ. vs. TEMP.
Temperature oC SWR200C
DISTORTION VS. TEMP
Temperature oC SWR200M
Temperature oC SWR200C
Temperature oC SWR200M
NORMALIZED DISTORTION vs. C2/C1
DISTORTION vs. FREQUENCY
Temperature oC
POWER SUPPLY CURRENT vs. TEMP.
Frequency (Hz)
CASE TEMP. RISE ABOVE AMBIENT vs. OUTPUT CURRENT
C2/C1
JUNCTION TEMP. RISE ABOVE CASE TEMP. vs OUTPUT CURRENT
Temperature oC
Output Current (mA)
Output Current (mA)
SWR200DS
3
SWR200
3. THEORY OF OPERATION
Product Innovation From
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.
4. APPLICATION INFORMATION
Figure 1 shows the connections for the SWR200 including the two frequency setting capacitors. The frequency is:
f=
10-5 C1 C2
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.
EXTERNAL CONNECTIONS
PIN CONFIGURATION
TOP VIEW
C1 C1 -PS NC NC NC GND C2 C2 +PS
SWR200
NC NC OUTPUT GND SENSE
4
SWR200DS
Product Innovation From
SWR200
CONTACTING CIRRUS LOGIC SUPPORT
For all Apex Precision Power product questions and inquiries, call toll free 800-546-2739 in North America. For inquiries via email, please contact apex.support@cirrus.com. International customers can also request support by contacting their local Cirrus Logic Sales Representative. To find the one nearest to you, go to www.cirrus.com
IMPORTANT NOTICE Cirrus Logic, Inc. and its subsidiaries ("Cirrus") believe that the information contained in this document is accurate and reliable. However, the information is subject to change without notice and is provided "AS IS" without warranty of any kind (express or implied). Customers are advised to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgment, including those pertaining to warranty, indemnification, and limitation of liability. No responsibility is assumed by Cirrus for the use of this information, including use of this information as the basis for manufacture or sale of any items, or for infringement of patents or other rights of third parties. This document is the property of Cirrus and by furnishing this information, Cirrus grants no license, express or implied under any patents, mask work rights, copyrights, trademarks, trade secrets or other intellectual property rights. Cirrus owns the copyrights associated with the information contained herein and gives consent for copies to be made of the information only for use within your organization with respect to Cirrus integrated circuits or other products of Cirrus. This consent does not extend to other copying such as copying for general distribution, advertising or promotional purposes, or for creating any work for resale. CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE ("CRITICAL APPLICATIONS"). CIRRUS PRODUCTS ARE NOT DESIGNED, AUTHORIZED OR WARRANTED TO BE SUITABLE FOR USE IN PRODUCTS SURGICALLY IMPLANTED INTO THE BODY, AUTOMOTIVE SAFETY OR SECURITY DEVICES, LIFE SUPPORT PRODUCTS OR OTHER CRITICAL APPLICATIONS. INCLUSION OF CIRRUS PRODUCTS IN SUCH APPLICATIONS IS UNDERSTOOD TO BE FULLY AT THE CUSTOMER'S RISK AND CIRRUS DISCLAIMS AND MAKES NO WARRANTY, EXPRESS, STATUTORY OR IMPLIED, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR PARTICULAR PURPOSE, WITH REGARD TO ANY CIRRUS PRODUCT THAT IS USED IN SUCH A MANNER. IF THE CUSTOMER OR CUSTOMER'S CUSTOMER USES OR PERMITS THE USE OF CIRRUS PRODUCTS IN CRITICAL APPLICATIONS, CUSTOMER AGREES, BY SUCH USE, TO FULLY INDEMNIFY CIRRUS, ITS OFFICERS, DIRECTORS, EMPLOYEES, DISTRIBUTORS AND OTHER AGENTS FROM ANY AND ALL LIABILITY, INCLUDING ATTORNEYS' FEES AND COSTS, THAT MAY RESULT FROM OR ARISE IN CONNECTION WITH THESE USES. Cirrus Logic, Cirrus, and the Cirrus Logic logo designs, Apex Precision Power, Apex and the Apex Precision Power logo designs are trademarks of Cirrus Logic, Inc. All other brand and product names in this document may be trademarks or service marks of their respective owners.
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