參數(shù)資料
型號(hào)： INA333AIDRGR
廠商： Texas Instruments
文件頁(yè)數(shù)： 4/27頁(yè)
文件大小： 0K
描述： IC INSTR AMP PREV LOW PWR 8SON
標(biāo)準(zhǔn)包裝： 3,000
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-WFDFN 裸露焊盤
供應(yīng)商設(shè)備封裝： 8-SON 裸露焊盤（3x3）
包裝： 帶卷 (TR)
NOISE PERFORMANCE
INTERNAL OFFSET CORRECTION
INPUT BIAS CURRENT RETURN PATH
OFFSET TRIMMING
10kW
OPA333
±10mV
AdjustmentRange
100W
100 A
m
1/2REF200
100 A
m
1/2REF200
V+
V-
R
G
INA333
Ref
V
O
V
IN-
V
IN+
SBOS445B – JULY 2008 – REVISED OCTOBER 2008 ..................................................................................................................................................... www.ti.com
Table 1. Commonly-Used Gains and Resistor Values
DESIRED GAIN
RG ()
NEAREST 1% RG ()
1
NC(1)
NC
2
100k
5
25k
24.9k
10
11.1k
11k
20
5.26k
5.23k
50
2.04k
2.05
100
1.01k
1k
200
502.5
499
500
200.4
200
1000
100.1
100
(1)
NC denotes no connection. When using the SPICE model, the simulation will not converge unless a resistor is connected to the RG pins;
use a very large resistor value.
The auto-calibration technique used by the INA333
The INA333 internal op amps use an auto-calibration
results in reduced low frequency noise, typically only
technique with a time-continuous 350kHz op amp in
50nV/
√Hz, (G = 100). The spectral noise density can
the signal path. The amplifier is zero-corrected every
be seen in detail in Figure 8. Low frequency noise of
8
s using a proprietary technique. Upon power-up,
the INA333 is approximately 1
V
PP measured from
the amplifier requires approximately 100
s to achieve
0.1Hz to 10Hz, (G = 100).
specified VOS accuracy. This design has no aliasing
or flicker noise.
The input impedance of the INA333 is extremely
high—approximately 100G
. However, a path must
Most
applications
require
no
external
offset
be provided for the input bias current of both inputs.
adjustment; however, if necessary, adjustments can
This input bias current is typically ±70pA. High input
be made by applying a voltage to the REF terminal.
impedance
means
that
this
input
bias
current
Figure 33 shows an optional circuit for trimming the
changes very little with varying input voltage.
output offset voltage. The voltage applied to REF
terminal is summed at the output. The op amp buffer
Input circuitry must provide a path for this input bias
provides low impedance at the REF terminal to
current for proper operation. Figure 34 illustrates
preserve good common-mode rejection.
various provisions for an input bias current path.
Without a bias current path, the inputs will float to a
potential that exceeds the common-mode range of
the INA333, and the input amplifiers will saturate. If
the differential source resistance is low, the bias
current return path can be connected to one input
(see the thermocouple example in Figure 34). With
higher source impedance, using two equal resistors
provides a balanced input with possible advantages
of lower input offset voltage as a result of bias current
and better high-frequency common-mode rejection.
Figure 33. Optional Trimming of Output Offset
Voltage
12
Copyright 2008, Texas Instruments Incorporated
Product Folder Link(s): INA333
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INA333AIDRGT 功能描述:儀表放大器 Lo Pwr Prec Instr Amp RoHS:否 制造商:Texas Instruments 通道數(shù)量: 輸入補(bǔ)償電壓:150 V 可用增益調(diào)整: 最大輸入電阻:10 kOhms 共模抑制比（最小值）:88 dB 工作電源電壓:2.7 V to 36 V 電源電流:200 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:MSOP-8 封裝:Bulk
INA333-HT 制造商:TI 制造商全稱:Texas Instruments 功能描述:Micro-Power, Zer?-Drift, Rail-to-Rail Out Instrumentation Amplifier
INA333SHKJ 功能描述:儀表放大器 Low Pwr,Prec Instr Amp RoHS:否 制造商:Texas Instruments 通道數(shù)量: 輸入補(bǔ)償電壓:150 V 可用增益調(diào)整: 最大輸入電阻:10 kOhms 共模抑制比（最小值）:88 dB 工作電源電壓:2.7 V to 36 V 電源電流:200 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:MSOP-8 封裝:Bulk
INA333SHKQ 功能描述:儀表放大器 Low Power,Prec Instr Amp RoHS:否 制造商:Texas Instruments 通道數(shù)量: 輸入補(bǔ)償電壓:150 V 可用增益調(diào)整: 最大輸入電阻:10 kOhms 共模抑制比（最小值）:88 dB 工作電源電壓:2.7 V to 36 V 電源電流:200 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:MSOP-8 封裝:Bulk
INA333SJD 功能描述:儀表放大器 Low Pwr,Prec Instr Amp RoHS:否 制造商:Texas Instruments 通道數(shù)量: 輸入補(bǔ)償電壓:150 V 可用增益調(diào)整: 最大輸入電阻:10 kOhms 共模抑制比（最小值）:88 dB 工作電源電壓:2.7 V to 36 V 電源電流:200 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:MSOP-8 封裝:Bulk
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