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參數(shù)資料
| 型號(hào)： | ADS-119 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | LJT 12C 8#20 4#16 SKT RECP |
| 中文描述： | 12位，10MHz的，低功耗采樣A / D轉(zhuǎn)換器 |
| 文件頁(yè)數(shù)： | 4/8頁(yè) |
| 文件大小： | 134K |
| 代理商： | ADS-119 |
ADS -119
4
Figure 4. Typical Connection Diagram
CALIBRATION PROCEDURE
(Refer to Figures 3 and 4, Table 1)
Any offset and/or gain calibration procedures should not be
implemented until devices are fully warmed up. To avoid
interaction, offset must be adjusted before gain. The ranges of
adjustment for the circuits in Figure 3 and 4 are guaranteed to
compensate for the ADS-119's initial accuracy errors and may
not be able to compensate for additional system errors.
A/D converters are calibrated by positioning their digital outputs
exactly on the transition point between two adjacent digital
output codes. This can be accomplished by connecting LED's
to the digital outputs and adjusting until certain LED's "flicker"
equally between on and off. Other approaches employ digital
comparators or microcontrollers to detect when the outputs
change from one code to the next.
Offset adjusting for the ADS-119 is normally accomplished at
the point where the MSB is a 1 and all other output bits are 0's
and the LSB just changes from a 0 to a 1. This digital output
transition ideally occurs when the applied analog input is
+ LSB (+366μV).
Gain adjusting is accomplished when all bits are 1's and the
LSB just changes from a 1 to a 0. This transition ideally occurs
when the analog input is at +full scale minus 1 LSB's
(+1.4989V).
Zero/Offset Adjust Procedure
1. Apply a train of pulses to the START CONVERT input
(pin 16) so the converter is continuously converting.
2. Apply +366μV to the ANALOG INPUT (pin 19).
3. Adjust the offset potentiometer until the output bits are
1000 0000 0000 and the LSB flickers between 0 and 1.
Gain Adjust Procedure
1. Apply +1.4989V to the ANALOG INPUT (pin 19).
2. Adjust the gain potentiometer until all output bits are 1's and
the LSB flickers between 1 and 0.
3. To confirm proper operation of the device, vary the input
signal to obtain the output coding listed in Table 1.
+FS–1 LSB
+3/4 FS
+1/2 FS
0
–1/2 FS
–3/4 FS
–FS +1 LSB
–FS
+1.49927V
+1.12500V
+0.75000V
0.00000V
–0.75000V
–1.12500V
–1.49927V
–1.50000V
1111 1111 1111
1110 0000 0000
1100 0000 0000
1000 0000 0000
0100 0000 0000
0010 0000 0000
0000 0000 0001
0000 0000 0000
BIPOLAR
SCALE
ADS-119
INPUT VOLTAGE
(±1.5V RANGE)
OUTPUT CODING
OFFSET BINARY
MSB
LSB
Table 1. Output Coding for Bipolar Operation
To Pin 19
of ADS-119
–15V
SIGNAL
INPUT
GAIN
ADJUST
1.98k
50
+15V
2k
Figure 3. Optional Calibration Circuit, ADS-119
0.1μF
0.1μF
4.7μF
4.7μF
13, 20
20
18, 20
ADS-119
–5V
20k
+5V
14
–5V
+5V
19
17
16
12
11
10
9
8
7
6
5
4
3
2
1
15
BIT 1 (MSB)
BIT 2
BIT 3
BIT 4
BIT 5
BIT 6
BIT 7
BIT 8
BIT 9
BIT 10
BIT 11
BIT 12 (LSB)
DATA VALID
ANALOG INPUT
START CONVERT
A single +5V supply should be used for both the +5V analog and +5V digital.
If separate supplies are used, the difference between the two cannot exceed 100mV.
OFFSET
ADJUST
+
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