參數(shù)資料
型號: LT1167ACS8
廠商: LINEAR TECHNOLOGY CORP
元件分類: 運動控制電子
英文描述: TRANS NPN 200VCEO 70MA TO-92
中文描述: INSTRUMENTATION AMPLIFIER, 60 uV OFFSET-MAX, 1 MHz BAND WIDTH, PDSO8
封裝: 0.150 INCH, PLASTIC, SO-8
文件頁數(shù): 15/20頁
文件大?。?/td> 426K
代理商: LT1167ACS8
15
LT1167
APPLICATIO
S I
FOR
ATIO
U
W
U
U
Figure 6. “Roll Your Own” vs LT1167
“ROLL YOUR OWN”’ CIRCUIT
CALCULATION
ERROR SOURCE
Absolute Accuracy at T
A
= 25
°
C
Input Offset Voltage,
μ
V
Output Offset Voltage,
μ
V
Input Offset Current, nA
CMR, dB
LT1167C CIRCUIT CALCULATION
LT1167C
“ROLL YOUR OWN”
60
μ
V/20mV
(300
μ
V/100)/20mV
[(450pA)(350/2)
]/20mV
110dB
[
(
3.16ppm)(5V)]/20mV
100
μ
V/20mV
[(60
μ
V)(2)/100]/20mV
[(450pA)(350
)/2]/20mV
[(0.02% Match)(5V)]/20mV
Total Absolute Error
3000
150
4
790
3944
5000
60
4
500
5564
Drift to 85
°
C
Gain Drift, ppm/
°
C
Input Offset Voltage Drift,
μ
V/
°
C
Output Offset Voltage Drift,
μ
V/
°
C
(50ppm + 10ppm)(60
°
C)
[(0.4
μ
V/
°
C)(60
°
C)]/20mV
[6
μ
V/
°
C)(60
°
C)]/100/20mV
(100ppm/
°
C Track)(60
°
C)
[(1.6
μ
V/
°
C)(60
°
C)]/20mV
[(1.1
μ
V/
°
C)(2)(60
°
C)]/100/20mV
Total Drift Error
3600
1200
180
4980
6000
4800
66
10866
Resolution
Gain Nonlinearity, ppm of Full Scale
Typ 0.1Hz to 10Hz Voltage Noise,
μ
V
P-P
15ppm
0.28
μ
V
P-P
/20mV
10ppm
(0.3
μ
V
P-P
)(
2)/20mV
Total Resolution Error
Grand Total Error
15
14
29
10
21
31
8953
16461
G = 100, V
S
=
±
15V
All errors are min/max and referred to input.
Table 1. “Roll Your Own” vs LT1167 Error Budget
ERROR, ppm OF FULL SCALE
Current Source
Figure 7 shows a simple, accurate, low power program-
mable current source. The differential voltage across Pins
2 and 3 is mirrored across R
G
. The voltage across R
G
is
amplified and applied across R
X
, defining the output
current. The 50
μ
A bias current flowing from Pin 5 is
buffered by the LT1464 JFET operational amplifier. This
has the effect of improving the resolution of the current
source to 3pA, which is the maximum I
B
of the LT1464A.
Replacing R
G
with a programmable resistor greatly
increases the range of available output currents.
+
+
+
350
350
350
350
10V
10k**
PRECISION BRIDGE TRANSDUCER
LT1167 MONOLITHIC
INSTRUMENTATION AMPLIFIER
G = 100, R
=
±
10ppm TC
SUPPLY CURRENT = 1.3mA MAX
“ROLL YOUR OWN” INST AMP, G = 100
* 0.02 RESISTOR MATCH, 3ppm/
°
C TRACKING
** DISCRETE 1% RESISTOR,
±
100ppm/
°
C TC
100ppm TRACKING
SUPPLY CURRENT = 1.35mA FOR 3 AMPLIFIERS
1167 F06
R
G
499
1/4
LT1114A
1/4
LT1114A
1/4
LT1114A
10k**
100
**
10k*
10k*
10k*
10k*
+
LT1167C
REF
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