參數(shù)資料
型號: INA333AIDGKRG4
廠商: Texas Instruments
文件頁數(shù): 3/27頁
文件大?。?/td> 0K
描述: IC INST AMP PREC LOW PWR 8-MSOP
視頻文件: INA333 Zero-Drift Instrumentation Amp
標(biāo)準(zhǔn)包裝: 2,500
放大器類型: 儀表
電路數(shù): 1
輸出類型: 滿擺幅
轉(zhuǎn)換速率: 0.16 V/µs
-3db帶寬: 150kHz
電流 - 輸入偏壓: 70pA
電壓 - 輸入偏移: 10µV
電流 - 電源: 50µA
電流 - 輸出 / 通道: 40mA
電壓 - 電源,單路/雙路(±): 1.8 V ~ 5.5 V,±0.9 V ~ 2.75 V
工作溫度: -40°C ~ 125°C
安裝類型: 表面貼裝
封裝/外殼: 8-TSSOP,8-MSOP(0.118",3.00mm 寬)
供應(yīng)商設(shè)備封裝: 8-MSOP
包裝: 帶卷 (TR)
APPLICATION INFORMATION
SETTING THE GAIN
A
1
A
2
A
3
6
150kW
7
4
3
8
1
2
V
IN-
V
IN+
R
G
V+
V-
INA333
G=1+
100kW
R
G
5
RFIFilter
50kW
RFIFilter
Load
V =G
(V
V
-
)
O
IN+
IN-
0.1 F
m
0.1 F
m
+
-
V
O
R
G
Alsodrawninsimplifiedform:
INA333
Ref
V
O
V
IN-
V
IN+
Ref
RFIFilter
www.ti.com ..................................................................................................................................................... SBOS445B – JULY 2008 – REVISED OCTOBER 2008
Figure 32 shows the basic connections required for
Table 1 lists several commonly-used gains and
operation of the INA333. Good layout practice
resistor values. The 100k
term in Equation 1 comes
mandates the use of bypass capacitors placed close
from the sum of the two internal feedback resistors of
to the device pins as shown.
A1 and A2. These on-chip resistors are laser trimmed
to accurate absolute values. The accuracy and
The output of the INA333 is referred to the output
temperature coefficient of these resistors are included
reference
(REF)
terminal,
which
is
normally
in the gain accuracy and drift specifications of the
grounded. This connection must be low-impedance to
INA333.
assure good common-mode rejection. Although 15
or less of stray resistance can be tolerated while
The stability and temperature drift of the external gain
maintaining specified CMRR, small stray resistances
setting resistor, RG, also affects gain. The contribution
of tens of ohms in series with the REF pin can cause
of RG to gain accuracy and drift can be directly
noticeable degradation in CMRR.
inferred from the gain Equation 1. Low resistor values
required for high gain can make wiring resistance
important. Sockets add to the wiring resistance and
contribute additional gain error (possibly an unstable
Gain of the INA333 is set by a single external
gain error) in gains of approximately 100 or greater.
resistor, RG, connected between pins 1 and 8. The
To ensure stability, avoid parasitic capacitance of
value of RG is selected according to Equation 1:
more than a few picofarads at the RG connections.
Careful matching of any parasitics on both RG pins
G = 1 + (100k
/RG)
(1)
maintains optimal CMRR over frequency.
Figure 32. Basic Connections
Copyright 2008, Texas Instruments Incorporated
11
Product Folder Link(s): INA333
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