參數(shù)資料
型號(hào)： AD623BNZ
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 11/24頁(yè)
文件大?。?/td> 0K
描述： IC AMP INST R-R LP 8DIP
標(biāo)準(zhǔn)包裝： 50
放大器類型： 儀表
電路數(shù)： 1
輸出類型： 滿擺幅
轉(zhuǎn)換速率： 0.3 V/µs
-3db帶寬： 800kHz
電流 - 輸入偏壓： 17nA
電壓 - 輸入偏移： 25µV
電流 - 電源： 375µA
電壓 - 電源，單路/雙路(±)： 2.7 V ~ 12 V，± 2.5 V ~ 6 V
工作溫度： -40°C ~ 85°C
安裝類型： 通孔
封裝/外殼： 8-DIP（0.300"，7.62mm）
供應(yīng)商設(shè)備封裝： 8-PDIP
包裝： 管件
AD623
Rev. D | Page 19 of 24
Ground Returns for Input Bias Currents
Input bias currents are those dc currents that must flow to bias
the input transistors of an amplifier. These are usually transistor
base currents. When amplifying floating input sources, such as
transformers or ac-coupled sources, there must be a direct dc
path into each input in order that the bias current can flow.
Figure 49, Figure 50, and Figure 51 show how a bias current
path can be provided for the cases of transformer coupling,
thermocouple, and capacitive ac coupling. In dc-coupled resistive
bridge applications, providing this path is generally not necessary
as the bias current simply flows from the bridge supply through
the bridge into the amplifier. However, if the impedances that
the two inputs see are large and differ by a large amount (>10 kΩ),
the offset current of the input stage causes dc errors
proportional with the input offset voltage of the amplifier.
AD623
OUTPUT
TO POWER
SUPPLY
GROUND
REF
LOAD
+VS
–VS
2
1
8
3
6
5
7
4
RG
–IN
+IN
007
78
-04
8
Figure 49. Ground Returns for Bias Currents with Transformer-Coupled Inputs
AD623
OTUPUT
TO POWER
SUPPLY
GROUND
REF
LOAD
+VS
–VS
2
1
8
3
6
5
7
4
RG
–IN
+IN
00
77
8-
0
49
Figure 50. Ground Returns for Bias Currents with Thermocouple Inputs
AD623
OUTPUT
TO POWER
SUPPLY
GROUND
REF
LOAD
+VS
–VS
2
1
8
3
6
5
7
4
RG
–IN
+IN
100k
00
77
8-
0
50
Figure 51. Ground Returns for Bias Currents with AC-Coupled Inputs
Output Buffering
The AD623 is designed to drive loads of 10 kΩ or greater. If
the load is less than this value, the output of the AD623 should
be buffered with a precision single-supply op amp, such as the
OP113. This op amp can swing from 0 V to 4 V on its output
while driving a load as small as 600 Ω. Table 7 summarizes the
performance of some buffer op amps.
5V
0.1F
5V
0.1F
AD623
OP113
RG
VIN
REFERENCE
VOUT
00
77
8-
05
1
Figure 52. Output Buffering
Table 7. Buffering Options
Op Amp
Description
Single supply, high output current
Rail-to-rail input and output, low supply current
Single-Supply Data Acquisition System
Interfacing bipolar signals to single-supply ADCs presents a
challenge. The bipolar signal must be mapped into the input
range of the ADC. Figure 53 shows how this translation can be
achieved.
5V
0.1F
5V
0.1F
AD623
RG
1.02k
REFERENCE
±10mV
AIN
REFOUT
REFIN
AD7776
00
77
8-
05
2
Figure 53. A Single-Supply Data Acquisition System
The bridge circuit is excited by a 5 V supply. The full-scale output
voltage from the bridge (±10 mV) therefore has a common-
mode level of 2.5 V. The AD623 removes the common-mode
component and amplifies the input signal by a factor of 100
(RGAIN = 1.02 kΩ). This results in an output signal of ±1 V. To
prevent this signal from running into the ground rail of the
AD623, the voltage on the REF pin must be raised to at least
1 V. In this example, the 2 V reference voltage from the AD7776
ADC is used to bias the output voltage of the AD623 to 2 V ± 1 V.
This corresponds to the input range of the ADC.
相關(guān)PDF資料
PDF描述
LT1125CSW#TRPBF IC OP-AMP LOW NOISE QUAD 16-SOIC
MTSW-120-08-T-S-295 CONN HEADER 20POS .100" STR TIN
RL0402FR-070R27L RES .27 OHM 1/16W 1% 0402 SMD
LT1125CSW#TR IC OPAMP QUAD PREC HS LN 16SOIC
N2526-6002-UG CONN HEADER 26POS STR GOLD T/H
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AD623BR 功能描述:IC AMP INST R-R LP 8SOIC RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 放大器類型:通用 電路數(shù):4 輸出類型:滿擺幅 轉(zhuǎn)換速率:0.6 V/µs 增益帶寬積:1MHz -3db帶寬:- 電流 - 輸入偏壓:2pA 電壓 - 輸入偏移:1000µV 電流 - 電源:85µA 電流 - 輸出 / 通道:20mA 電壓 - 電源，單路/雙路(±):1.8 V ~ 6 V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:14-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:14-SOICN 包裝:剪切帶 (CT) 產(chǎn)品目錄頁(yè)面:680 (CN2011-ZH PDF) 其它名稱:MCP6L04T-E/SLCT
AD623BR-REEL 功能描述:IC AMP INST R-R LP 8SOIC RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 放大器類型:通用 電路數(shù):1 輸出類型:滿擺幅 轉(zhuǎn)換速率:0.11 V/µs 增益帶寬積:350kHz -3db帶寬:- 電流 - 輸入偏壓:4nA 電壓 - 輸入偏移:20µV 電流 - 電源:260µA 電流 - 輸出 / 通道:20mA 電壓 - 電源，單路/雙路(±):2.7 V ~ 36 V，±1.35 V ~ 18 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:8-SO 包裝:帶卷 (TR)
AD623BR-REEL7 功能描述:IC AMP INST R-R LP 8SOIC RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 放大器類型:通用 電路數(shù):1 輸出類型:滿擺幅 轉(zhuǎn)換速率:0.11 V/µs 增益帶寬積:350kHz -3db帶寬:- 電流 - 輸入偏壓:4nA 電壓 - 輸入偏移:20µV 電流 - 電源:260µA 電流 - 輸出 / 通道:20mA 電壓 - 電源，單路/雙路(±):2.7 V ~ 36 V，±1.35 V ~ 18 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:8-SO 包裝:帶卷 (TR)
AD623BRZ 功能描述:IC AMP INST R-R LP 8SOIC RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 放大器類型:通用 電路數(shù):4 輸出類型:- 轉(zhuǎn)換速率:0.6 V/µs 增益帶寬積:1MHz -3db帶寬:- 電流 - 輸入偏壓:45nA 電壓 - 輸入偏移:2000µV 電流 - 電源:1.4mA 電流 - 輸出 / 通道:40mA 電壓 - 電源，單路/雙路(±):3 V ~ 32 V，±1.5 V ~ 16 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:14-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:14-TSSOP 包裝:帶卷 (TR) 其它名稱:LM324ADTBR2G-NDLM324ADTBR2GOSTR
AD623BRZ 制造商:Analog Devices 功能描述:INST AMP RR 12V 800KHZ 8SOIC
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*