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ADS-118 bảng dữ liệu(PDF) 4 Page - List of Unclassifed Manufacturers

tên linh kiện ADS-118
Giải thích chi tiết về linh kiện  12-Bit, 5MHz, Low-Power Sampling A/D Converters
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nhà sản xuất  ETC [List of Unclassifed Manufacturers]
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ADS-118 bảng dữ liệu(HTML) 4 Page - List of Unclassifed Manufacturers

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ADS-118/118A
®
®
4
SIGNAL
INPUT
GAIN
ADJUST
50
To Pin19
of ADS-118A
Potentiometer is at 25
Ω during the device's factory trim procedure.
20k
–15V (or –5V)
+15V (or +5V)
To Pin17
of ADS-118A
ZERO/
OFFSET
ADJUST
To Pin19
of ADS-118
–15V
SIGNAL
INPUT
GAIN
ADJUST
1.98k
50
+15V
2k
1.2M
20k
–15V
+15V
ZERO/
OFFSET
ADJUST
CALIBRATION PROCEDURE
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 Figures 2a and 2b are guaranteed
to compensate for the ADS-118'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.
For the ADS-118, offset adjusting 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
+½LSB (+244µV for ADS-118; +305µV for ADS-118A).
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 1½ LSB's
(+0.99927V for ADS-118; +1.249085V for ADS-118A).
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 +244µV (ADS-118) or +305µV (ADS-118A) to the
ANALOG INPUT (pin 19).
Table 1. Output Coding for Bipolar Operation
+FS –1 LSB
+0.99951V
1111 1111 1111
+1.2494V
+3/4 FS
+0.75000V
1110 0000 0000
+0.9375V
+1/2 FS
+0.50000V
1100 0000 0000
+0.6250V
0
0.00000V
1000 0000 0000
0.0000V
–1/2 FS
–0.50000V
0100 0000 0000
–0.6250V
–3/4 FS
–0.75000V
0010 0000 0000
–0.9375V
–FS +1 LSB
–0.99951V
0000 0000 0001
–1.2494V
–FS
–1.00000V
0000 0000 0000
–1.2500V
ADS-118
OUTPUT CODING
ADS-118A
INPUT
INPUT
BIPOLAR
RANGE
OFFSET BINARY
RANGE
SCALE
(±1V )
MSB
LSB
(±1.25V )
3. Adjust the offset potentiometer until the output bits are
1000 0000 00000 and the LSB flickers between 0 and 1.
Gain Adjust Procedure
1. Apply +0.99927V (ADS-118) or +1.249085V (ADS-118A) 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.
Figure 2a. Optional ADS-118 External
Gain and Offset Adjust Circuits
Figure 2b. Optional ADS-118A
Gain and Offset Adjust Circuits


Số phần tương tự - ADS-118

nhà sản xuấttên linh kiệnbảng dữ liệuGiải thích chi tiết về linh kiện
logo
Murata Power Solutions ...
ADS-118 MURATA-PS-ADS-118 Datasheet
181Kb / 8P
   12-Bit, 5MHz, Low-Power Sampling A/D Converters
logo
DATEL, Inc.
ADS-118-C/883 DATEL-ADS-118-C/883 Datasheet
105Kb / 1P
   Sampling A/D Converters
ADS-118-C883 DATEL-ADS-118-C883 Datasheet
105Kb / 1P
   Sampling A/D Converters
ADS-118/883 DATEL-ADS-118/883 Datasheet
105Kb / 1P
   Sampling A/D Converters
ADS-118883 DATEL-ADS-118883 Datasheet
105Kb / 1P
   Sampling A/D Converters
More results

Mô tả tương tự - ADS-118

nhà sản xuấttên linh kiệnbảng dữ liệuGiải thích chi tiết về linh kiện
logo
Murata Power Solutions ...
ADS-118 MURATA-PS-ADS-118 Datasheet
181Kb / 8P
   12-Bit, 5MHz, Low-Power Sampling A/D Converters
ADS-235 MURATA-PS-ADS-235 Datasheet
406Kb / 8P
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ADS-935 MURATA-PS-ADS-935 Datasheet
420Kb / 8P
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ADS-944 MURATA-PS-ADS-944 Datasheet
174Kb / 8P
   14-Bit, 5MHz Sampling A/D Converters
logo
List of Unclassifed Man...
ADS944 ETC-ADS944 Datasheet
172Kb / 8P
   14-Bit, 5MHz Sampling A/D Converters
ADS-112 ETC-ADS-112 Datasheet
73Kb / 6P
   12-Bit, 1MHz, Low-Power Sampling A/D Converters
logo
Murata Power Solutions ...
ADS-112 MURATA-PS-ADS-112 Datasheet
156Kb / 6P
   12-Bit, 1MHz, Low-Power Sampling A/D Converters
logo
List of Unclassifed Man...
ADS119 ETC-ADS119 Datasheet
134Kb / 8P
   12-Bit, 10MHz, Low-Power Sampling A/D Converters
ADS-117 ETC-ADS-117 Datasheet
165Kb / 6P
   12-Bit, 2MHz, Low-Power Sampling A/D Converters
ADS-238Q ETC1-ADS-238Q Datasheet
83Kb / 7P
   12-Bit, 20MHz, Low Power Sampling A/D Converters
More results


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