ADC-30634 データシートの表示（PDF） - DATEL Data Acquisition products
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ADC-30634 Datasheet PDF : 4 Pages
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ADC-30634-30720
5. The process that is used to fabricate the ADC-
30634/30720 eliminates the latchup phenomena that
has plagued CMOS devices in the past. These
converters do not require external protection diodes.
6. For clock rates less than 100kHz, there may be
some degradation in offset and differential nonlinearity.
Performance may be improved by increasing the clock
duty cycle (decreasing the time spent in the sample
mode).
7. Connect the converter appropriately; a typical
connection circuit is shown in Figure 2. Then apply an
appropriate clock input.The reference input should be
held to ±0.1% accuracy or better. Do not use the +5V
power supply as a reference without precision regulation
and high-frequency decoupling capacitors.
8. Zero Adjustment - Adjusting the voltage at
–REFERENCE (pin 3) adjusts the offset or zero of the
device. Pin 3 can be tied to GROUND for operation
without adjustments
9. Full Scale Adjustment - Adjusting the voltage at
+REFERENCE (pin 9) adjusts the gain of the device. Pin
9 can be tied directly to a +5V reference for operation
without adjustment.
Table 1. ADC-30634/ADC-30720 Output Code
ANALOG
INPUT
CODE
DATA
1234
0.00V
+0.02V
+1.28V
+2.54V
+2.56V
+2.58V
+3.84V
+5.10V
Zero 0000
+1 LSB
+¼ FS
+½ FS-ILSB
+½ FS
+½ FS+ILSB
+¾ FS
+FS
0000
0000
0100
0111
1000
1000
1100
1111
DATA
5678
0000
0001
0000
1111
0000
0001
0000
1111
DECIMAL HEX
0
00
1
01
64
40
127
7F
128
80
129
81
192
C0
255
FF
Note:
Values shown here are for a +5.12Vdc reference. Scale other refereces
proportionally. (+REF=+5.12V, –REF=GND, ¼, ½, and ¾ References
FS=No Connection)
10.Integral Nonlinearity Adjustments - Provision is made
for optional adjustment of Integral Nonlinearity through
access of the reference's ¼, ½, and ¾ full scale points.
For example, the REF. MIDPOINT (pin 6) can be tied to
a precision voltage halfway between +REFERENCE and
–REFERENCE. Pins 6, 18 and 20 should be bypassed
to GROUND through 0.1µF capacitors for operation
without INL adjustments
+15
+5V
0.1µF
+
4.7µF
12
5
11 10Ω
HA-5033
10
4.7µF
–15
0.1µF
+
HP2811
+15V
2
6
REF. D2
5
4
+5V
4.7µF
+
0.01µF
20MHz CLOCK
CLOCK 2
VIN 5,7
10kΩ
+15V
2 1-N
1
LM324
3
1+N
2kΩ
+
4.7µF
0.1µF
1kΩ
1.5kΩ
0.1µF
1kΩ
1.5kΩ
1kΩ
2kΩ
0.1µF
0.1µF
B8 24 (LSB)
B7 23
B6 22
B5 21
B4 17
B3 16
B2 15
B1 14 (MSB)
20
R¼
R¾
18
9 1-N
8
LM324
10
1+N
+ 0.1µF
4.7µF
6 1-N
7
LM324
5
1+N
+
4.7µF
0.1µF
12 1-N
14
LM324
13
1+N
+ 0.1µF
4.7µF
Figure 2. ADC-30634 and ADC-30720 Typical Connection Diagram
DATEL, Inc., Mansfield, MA 02048 (USA) • Tel: (508)339-3000, (800)233-2765 Fax: (508)339-6356 • E–mail: sales@datel.com • Internet: www.datel.com
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