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HI1-574AJD-5 Datasheet(PDF) 10 Page - Intersil Corporation |
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HI1-574AJD-5 Datasheet(HTML) 10 Page - Intersil Corporation |
10 / 17 page 10 These will require an additional wideband buffer amplifier to lower their output impedance. A simpler solution is to use the Intersil HA-5320 Sample/Hold, which was designed for use with the HI-574A. Range Connections and Calibration Procedures The HI-X74A is a “complete” A/D converter, meaning it is fully operational with addition of the power supply voltages, a Start Convert signal, and a few external components as shown in Figure 2 and Figure 3. Nothing more is required for most applications. Whether controlled by a processor or operating in the stand- alone mode, the HI-X74A offers four standard input ranges: 0V to +10V, 0V to +20V, ±5V and ±10V. The maximum errors for gain and offset are listed under Specifications. If required, however, these errors may be adjusted to zero as explained below. Power supply and ground connections have been discussed in an earlier section. Unipolar Connections and Calibration Refer to Figure 2. The resistors shown (see Note below) are for calibration of offset and gain. If this is not required, replaceR2witha50 Ω, 1% metal film resistor and remove the network on pin 12. Connect pin 12 to pin 9. Then, connect the analog signal to pin 13 for the 0V to 10V range, or to pin 14 for the 0V to 20V range. Inputs to +20V (5V over the power supply) are no problem - the converter operates normally. Calibration consists of adjusting the converter’s most negative output to its ideal value (offset adjustment), then, adjusting the most positive output to its ideal value (gain adjustment). To understand the procedure, note that in principle, one is setting the output with respect to the midpoint of an increment of analog input, as denoted by two adjacent code changes. Nominal value of an increment is one LSB. However, this approach is impractical because nothing “happens” at a midpoint to indicate that an adjustment is complete. Therefore, calibration is performed in terms of the observable code changes instead of the midpoint between code changes. For example,midpointofthe firstLSB incrementshould be positioned at the origin, with an output code of all 0’s. To do this, apply an input of +1/2 LSB (+1.22mV for the 10V range; +2.44mV for the 20V range). Adjust the Offset potentiometer R1 until the first code transition flickers between 0000 0000 0000 and 0000 0000 0001. Next, perform a Gain Adjust at positive full scale. Again, the ideal input corresponding to the last code change is applied. This is 11/2 LSBs below the nominal full scale (+9.9963V for 10V range; +19.9927V for 20V range). Adjust the Gain potentiometer R2 for flicker between codes 1111 1111 1110 and 1111 1111 1111. Bipolar Connections and Calibration Refer to Figure 3. The gain and offset errors listed under Specifications may be adjusted to zero using potentiometers R1 and R2 (see Note below). If this isn’t required, either or both pots may be replaced by a 50 Ω,1% metal film resistor. †When driving the 20V (pin 14) input, minimize capacitance on pin 13. FIGURE 1. UNIPOLAR CONNECTIONS †When driving the 20V (pin 14) input, minimize capacitance on pin 13. FIGURE 2. BIPOLAR CONNECTIONS 10 REF IN 8REF OUT 12 BIP OFF 13 10VIN 14 20VIN† 9 ANA 16-19 LOW BITS 20-23 MIDDLE BITS 24-27 HIGH BITS STS 28 2 12/8 3CS 4AO 5R/C 6CE +5V 1 +15V 7 -15V 11 DIG COM 15 -15V OFFSET R1 100K +15V GAIN R2 100 Ω 100K 100 Ω 0V TO +10V ANALOG INPUTS 0V TO +20V COM 16-19 LOW BITS 20-23 MIDDLE BITS 24-27 HIGH BITS STS 28 +5V 1 +15V 7 -15V 11 DIG COM 15 GAIN R2 100 Ω 100 Ω ±5V ANALOG INPUTS ±10V OFFSET 10 REF IN 8REF OUT 12 BIP OFF 13 10VIN 14 20VIN† 9 ANA 212/8 3CS 4AO 5R/C 6CE COM R1 HI-574A, HI-674A |
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