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SP9316 Datasheet(PDF) 6 Page - Sipex Corporation |
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SP9316 Datasheet(HTML) 6 Page - Sipex Corporation |
6 / 8 page Corporation SIGNAL PROCESSING EXCELLENCE 186 Figure 4. Bipolar Guarding - + VOUT 15 16 14 Guard RFB IOUT1 IOUT2 SP9316 VREF - + Figure 3. Unipolar Guarding RFB IOUT1 IOUT2 - + VOUT 15 16 14 SP9316 Guard rated from the device drift, and that all measure- ments are taken at identical temperatures. The long–term drift of the SP9316 voltage output system transfer function, after initial op amp trim, will largely be determined by the choice of the external components. For minimum offset error the op amps should be trimmed after one hour of continuous operation. The SP9316 con- tribution to the offset drift after that time will be ±0.1ppm/°C per 1000 hours. The long–term gain drift error contribution of the SP9316 is ±1 ppm/ °C per 1000 hours. Also to be considered are the temperature coefficients of the external resistors, the op amp drift specifications and the stability of the reference. The SIPEX HS2700LD, with a stability drift of 3ppm/ °C, is recommended as a suitable voltage reference. The unique segmented architecture of the SP9316 resistor network, plus the low–TCR nichrome materials and processes used in its manufacture, results in an exceptionally low linearity drift with time. Typical differential linearity drift with temperature is 0.1ppm/ °C. APPLICATION Digitally–Controlled Low Pass Filter The SP9316 can be used to construct active filters which display very low noise and distor- tion characteristics. Low pass filters can be designed to provide digital control over center frequency, gain and Q-factor. The SP9316 is an ideal high resolution element for this applica- tion. Figure 5 shows a low–pass filter designed to be independent of the resistance of the SP9316 network by using it as a programmable gain element. The filter characteristic is given by: VOUT VIN –R3 R1 1 1+ j ω R3R4C R2D () = () where D is the binary code applied to the DAC and C is the value of the capacitor. LSB LATCH CONTROL REFERENCE INPUT MSB LATCH CONTROL IOUT2 IOUT1 FEEDBACK 5KΩ 15 14 16 19 13 20 PRECISION 16-BIT RESISTOR NETWORK & SWICHES BIT: 9 10 11 12 13 14 15 16 ANA GND +15V 5 418 17 3 2 1 24 232221 BIT: 8 7 6 5 4 3 2 1(MSB) 678 910 11 12 INPUT REGISTER INPUT REGISTER SP9316 – + A1 – + VIN R1 R2 +5V R3 – + VOUT R4 C A2 A3 VOUT VIN –R3 R1 1 1+ j ω R3R4C R2D () = () Figure 5. Digitally–Controlled Low–Pass Filter |
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