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SP574BS Datasheet(PDF) 8 Page - Sipex Corporation |
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SP574BS Datasheet(HTML) 8 Page - Sipex Corporation |
8 / 15 page SP574B/674B/1674B/774B 12–Bit Sampling A/D Converters © Copyright 2000 Sipex Corporation 8 +9.9927V for the ±10V range. Adjust the gain potentiometer R 2 for flicker between codes 1111 1110 and 1111 1111 1111. Alternative The 100 Ω potentiometer R 2 provides gain adjust for 10V and 20V ranges. In some applications, a full scale of 10.24V (for and LSB of 2.5mV) or 20.48 (for an LSB of 5.0mV) is more convenient. For these, replace R 2 by a 50Ω, 1% metal film resistor. Then to provide gain adjust for the 10.24 range, add a 200 Ωpotentiometer in series with pin 13. For the 20.48V range, add a 1000 Ωpotentiom- eter in series with pin 14. The gain adjustment should be done at positive full scale. The ideal input corresponding to the last code change is applied. This is 11⁄ 2LSB below the nominal full scale which is +9.9963V for the 10V range and +19.9927V for the 20V range. Adjust the gain potentiometer R 2 for flicker between codes 1111 1111 1110 and 1111 1111 1111. If calibration is not necessary for the intended appli- cation, replace R 2 with a 50Ω, 1% metal film resistor and remove the network analog input to pin 13 for the 0V to 10V range or to pin 14 for the 0V to 20V range. Bipolar The gain and offset errors listed in the specifica- tions may be adjusted to zero using the potentiom- eters R 1 and R2 (See Figure 3). If adjustment is not needed, either or both pots may be replaced by a 50 Ω, 1% metal film resistor. To calibrate, connect the analog input signal to pin 13 for a ±5V range or to pin 14 for a ±10V range. First apply a DC input voltage 1⁄ 2 LSB above negative full scale which is –4.9988V for the ±5V range or –9.9976V for the ±10V range. Adjust the offset potentiometer R 1 for flicker between output codes 0000 0000 0000 and 0000 0000 0001. Next, apply a DC input voltage 11⁄ 2 LSB below positive full scale which is +4.9963V for the ±5 range or CONTROLLING THE SPx74B The SPx74B can be operated by most micropro- cessor systems due to the control input pins and on–chip logic. It may also be operated in the “stand–alone” mode and enabled by the R/C input pin. Full microprocessor control consists of selecting an 8– or 12–bit conversion cycle, initiating the conversion, and reading the output data when ready. The output read has the options of choosing either 12–bits at once or 8–bits fol- lowed by 4–bits in a left–justified format. All five control inputs are TTL/CMOS compatible and include 12/8, CS, A 0, R/C and CE. The use of these inputs in controlling the converter’s operation is Figure 3. Bipolar Input Connections 2 28 STS 12/8 CS A0 R/C CE THREE–STATE BUFFERS AND CONTROL NIBBLE A NIBBLE B NIBBLE C 27 26 25 24 23 22 21 20 19 18 17 16 OUTPUT BITS MSB LSB 3 4 5 6 CONTROL LOGIC OSCILLATOR 12–BITS 12–BITS SAMPLE/HOLD CDAC LSB MSB OFFSET/GAIN TRIM NETWORK REF REF AMP 8 10 VREF OUT VREF IN 100 Ω R1 10V IN 20V IN BIP OFF 13 14 12 ANALOG INPUTS 12–BIT SAR COMP STROBE 100 Ω R2 ±5V ±10V DGND 1 15 VLOGIC +5V 711 VCC VEE 9 AGND +15V N.C. 10µF 0.1µF 10µF 0.1µF + + |
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