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參數(shù)資料
| 型號(hào)： | HI3-674AKN-5 |
| 廠商： | Intersil |
| 文件頁(yè)數(shù)： | 3/18頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 12BIT 67KSPS 28-SBDIP |
| 標(biāo)準(zhǔn)包裝： | 13 |
| 位數(shù)： | 12 |
| 采樣率（每秒）： | 67k |
| 數(shù)據(jù)接口： | 并聯(lián) |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 功率耗散（最大）： | 720mW |
| 電壓電源： | 雙 ± |
| 工作溫度： | 0°C ~ 75°C |
| 安裝類型： | 通孔 |
| 封裝/外殼： | 28-DIP（0.600"，15.24mm） |
| 供應(yīng)商設(shè)備封裝： | 28-PDIP |
| 包裝： | 管件 |
| 輸入數(shù)目和類型： | 2 個(gè)單端，單極；2 個(gè)單端，雙極 |
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11
FN3096.6
August 7, 2008
If the application calls for a Sample/Hold to precede the
converter, it should be noted that not all Sample/Holds are
compatible with the HI-574A in the manner described above.
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
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 1. The resistors shown (see Note below)
are for calibration of offset and gain. If this is not required,
replace R2 with a 50
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, midpoint of the first LSB increment should 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 2. 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
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
212/8
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
2 12/8
3CS
4AO
5R/C
6CE
COM
R1
HI-574A, HI-674A
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