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參數資料
| 型號： | LT1167ACN8 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 運動控制電子 |
| 英文描述： | TRANS NPN 50VCEO 1A TO-92L |
| 中文描述： | INSTRUMENTATION AMPLIFIER, 60 uV OFFSET-MAX, 1 MHz BAND WIDTH, PDIP8 |
| 封裝： | 0.300 INCH, PLASTIC, DIP-8 |
| 文件頁數： | 14/20頁 |
| 文件大?。?/td> | 426K |
| 代理商： | LT1167ACN8 |
14
LT1167
APPLICATIO
S I
N
FOR
ATIO
U
To significantly reduce the effect of these out-of-band
signals on the input offset voltage of instrumentation
amplifiers, simple lowpass filters can be used at the
inputs. This filter should be located very close to the input
pins of the circuit. An effective filter configuration is
illustrated in Figure 5, where three capacitors have been
added to the inputs of the LT1167. Capacitors C
XCM1
and
C
XCM2
form lowpass filters with the external series resis-
tors R
S1, 2
to any out-of-band signal appearing on each of
the input traces. Capacitor C
XD
forms a filter to reduce any
unwanted signal that would appear across the input traces.
An added benefit to using C
XD
is that the circuit’s AC
common mode rejection is not degraded due to common
mode capacitive imbalance. The differential mode and
common mode time constants associated with the capaci-
tors are:
t
DM(LPF)
= (2)(R
S
)(C
XD
)
t
CM(LPF)
= (R
S1, 2
)(C
XCM1, 2
)
Setting the time constants requires a knowledge of the
frequency, or frequencies of the interference. Once this
frequency is known, the common mode time constants
can be set followed by the differential mode time constant.
To avoid any possibility of inadvertently affecting the
W
U
signal to be processed, set the common mode time
constant an order of magnitude (or more) larger than the
differential mode time constant. To avoid any possibility of
common mode to differential mode signal conversion,
match the common mode time constants to 1% or better.
If the sensor is an RTD or a resistive strain gauge, then the
series resistors R
S1, 2
can be omitted, if the sensor is in
proximity to the instrumentation amplifier.
“Roll Your Own”—Discrete vs Monolithic LT1167
Error Budget Analysis
The LT1167 offers performance superior to that of “roll
your own” three op amp discrete designs. A typical appli-
cation that amplifies and buffers a bridge transducer’s
differential output is shown in Figure 6. The amplifier, with
its gain set to 100, amplifies a differential, full-scale output
voltage of 20mV over the industrial range. To make the
comparison challenging, the low cost version of the LT1167
will be compared to a discrete instrumentation amp made
with the A grade of one of the best precision quad op amps,
the LT1114A. The LT1167C outperforms the discrete
amplifier that has lower V
OS
, lower I
B
and comparable V
OS
drift. The error budget comparison in Table 1 shows how
various errors are calculated and how each error affects
the total error budget. The table shows the greatest
differences between the discrete solution and the LT1167
are input offset voltage and CMRR. Note that for the
discrete solution, the noise voltage specification is multi-
plied by
√
2 which is the RMS sum of the uncorelated noise
of the two input amplifiers. Each of the amplifier errors is
referenced to a full-scale bridge differential voltage of
20mV. The common mode range of the bridge is 5V. The
LT1114 data sheet provides offset voltage, offset voltage
drift and offset current specifications for the matched op
amp pairs used in the error-budget table. Even with an
excellent matching op amp like the LT1114, the discrete
solution’s total error is significantly higher than the
LT1167’s total error. The LT1167 has additional advan-
tages over the discrete design, including lower compo-
nent cost and smaller size.
V
–
V
+
IN
+
IN
–
1167 F05
V
OUT
R
G
C
100pF
C
100pF
C
10pF
R
1.6k
R
1.6k
EXTERNAL RFI
FILTER
–
+
LT1167
Figure 5. Adding a Simple RC Filter at the Inputs to an
Instrumentation Amplifier is Effective in Reducing Rectification
of High Frequency Out-of-Band Signals
相關PDF資料 |
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|---|---|
| LT1167ACS8 | TRANS NPN 200VCEO 70MA TO-92 |
| LT1167AI | TRANS NPN 80VCEO .5A TO-92L |
| LT1167C | TRANS NPN 100VCEO .5A TO-126 |
| LT1167CS8 | TRANS NPN 100VCEO .5A TO-126 |
| LT1167I | TRANS NPN HF 120VCEO .5A TO-126 |
相關代理商/技術參數 |
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| LT1167ACN8#PBF | 功能描述:IC PREC INSTRMNT-AMP PROG 8-DIP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:150 系列:- 放大器類型:音頻 電路數:2 輸出類型:- 轉換速率:5 V/µs 增益帶寬積:12MHz -3db帶寬:- 電流 - 輸入偏壓:100nA 電壓 - 輸入偏移:500µV 電流 - 電源:6mA 電流 - 輸出 / 通道:50mA 電壓 - 電源，單路/雙路(±):4 V ~ 32 V，±2 V ~ 16 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP（0.173"，4.40mm 寬） 供應商設備封裝:8-TSSOP 包裝:管件 |
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| LT1167ACS8#PBF | 功能描述:IC PREC INSTRMNT-AMP PROG 8-SOIC RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:150 系列:- 放大器類型:音頻 電路數:2 輸出類型:- 轉換速率:5 V/µs 增益帶寬積:12MHz -3db帶寬:- 電流 - 輸入偏壓:100nA 電壓 - 輸入偏移:500µV 電流 - 電源:6mA 電流 - 輸出 / 通道:50mA 電壓 - 電源，單路/雙路(±):4 V ~ 32 V，±2 V ~ 16 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP（0.173"，4.40mm 寬） 供應商設備封裝:8-TSSOP 包裝:管件 |
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