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HI1-574AJD-5 Datasheet(PDF) 10 Page - Intersil Corporation

Part # HI1-574AJD-5
Description  Complete, 12-Bit A/D Converters with Microprocessor Interface
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Manufacturer  INTERSIL [Intersil Corporation]
Direct Link  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

HI1-574AJD-5 Datasheet(HTML) 10 Page - Intersil Corporation

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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
100K
100
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
100
±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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