LTC1404(RevA) 查看數據表（PDF） - Linear Technology
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LTC1404 Datasheet PDF : 24 Pages
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LTC1404
APPLICATIONS INFORMATION
111...111
111...110
111...101
111...100
1LSB =
FS
4096
=
4.096
4096
UNIPOLAR
ZERO
000...011
000...010
000...001
000...000
0V 1
LSB
INPUT VOLTAGE (V)
FS – 1LSB
1404 F08
Figure 8. LTC1404 Unipolar Transfer Characteristics
011...111
011...110
000...001
000...000
111...111
111...110
BIPOLAR
ZERO
100...001
100...000
– FS/2
–1 0V 1
LSB LSB
INPUT VOLTAGE (V)
FS/2 – 1LSB
1404 F09
Figure 9. LTC1404 Bipolar Transfer Characteristics
R1
50Ω
VIN
R2
10k
+
A1
–
R4
100Ω
R3
10k
FULL-SCALE
ADJUST
ADDITIONAL PINS OMITTED FOR CLARITY
±20LSB TRIM RANGE
AIN
LTC1404
GND
1404 F10a
Figure 10a. LTC1404 Full-Scale Adjust Circuit
14
R1
ANALOG 10k
INPUT
0V TO 4.096V
10k
5V
+
R2
A1
10k
–
R9
20Ω
AIN
R4
100k
R5
4.3k
FULL-SCALE
ADJUST
LTC1404
R3
100k
R7
100k
R6
400Ω
5V
R8
10k
OFFSET
ADJUST
1404 F10b
Figure 10b. LTC1404 Offset and Full-Scale Adjust Circuit
R1
ANALOG 10k
INPUT
+
±2.048V
R2
A1
10k
–
R4
100k
R5
4.3k
FULL-SCALE
ADJUST
AIN
LTC1404
R3 R7
100k 100k
R6
200Ω
5V
R8
20k
OFFSET
ADJUST
–5V
1404 F10c
Figure 10c. LTC1404 Bipolar Offset and Full-Scale Adjust Circuit
Bipolar Offset and Full-Scale Error Adjustments
Bipolar offset and full-scale errors are adjusted in a similar
fashion to the unipolar case. Bipolar offset error adjust-
ment is achieved by applying an input voltage of – 0.5mV
(– 0.5LSB) to the input in Figure 10c and adjusting the op
amp until the ADC output code flickers between 0000 0000
0000 and 1111 1111 1111. For full-scale adjustment, an
input voltage of 2.0465V (FS – 1.5LSBs) is applied to the
input and R5 is adjusted until the output code flickers
between 0111 1111 1110 and 0111 1111 1111.
1404fa
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