參數(shù)資料
型號(hào): AD8426ACPZ-R7
廠(chǎng)商: Analog Devices Inc
文件頁(yè)數(shù): 20/28頁(yè)
文件大?。?/td> 0K
描述: IC AMP INSTR RR 1.5MHZ 16LFCSP
標(biāo)準(zhǔn)包裝: 1
放大器類(lèi)型: 儀表
電路數(shù): 2
輸出類(lèi)型: 滿(mǎn)擺幅
轉(zhuǎn)換速率: 0.6 V/µs
-3db帶寬: 1MHz
電流 - 輸入偏壓: 20nA
電壓 - 輸入偏移: 200µV
電流 - 電源: 350µA
電流 - 輸出 / 通道: 13mA
電壓 - 電源,單路/雙路(±): 2.2 V ~ 36 V,±1.35 V ~ 18 V
工作溫度: -40°C ~ 125°C
安裝類(lèi)型: 表面貼裝
封裝/外殼: 16-VQFN,CSP
供應(yīng)商設(shè)備封裝: 16-LFCSP(4x4)
包裝: 標(biāo)準(zhǔn)包裝
其它名稱(chēng): AD8426ACPZ-R7DKR
AD8426
Rev. 0 | Page 27 of 28
DRIVING AN ADC
Option 2 shows a circuit for driving higher frequency signals.
It uses a precision op amp (AD8616) with relatively high band-
width and output drive. This amplifier can drive a resistor and
capacitor with a much higher time constant and is, therefore,
suited for higher frequency applications.
Figure 72 shows several different methods of driving an ADC.
The ADC in the ADuC7026 microcontroller was chosen for
this example because it has an unbuffered, charge sampling
architecture that is typical of most modern ADCs. This type of
architecture typically requires an RC buffer stage between the
ADC and the amplifier to work correctly.
Option 3 is useful for applications where the AD8426 must
operate from a large voltage supply but drives a single-supply
ADC. In normal operation, the AD8426 output signal stays
within the ADC range, and the AD8616 simply buffers the signal.
However, in a fault condition, the output of the AD8426 may
go outside the supply range of both the AD8616 and the ADC.
This is not a problem in this circuit, because the 10 kΩ resistor
between the two amplifiers limits the current into the AD8616
to a safe level.
Option 1 shows the minimum configuration required to drive
a charge sampling ADC. The capacitor provides charge to the
ADC sampling capacitor, and the resistor shields the AD8426
from the capacitance. To keep the AD8426 stable, the RC time
constant of the resistor and capacitor needs to stay above 5 μs.
This circuit is mainly useful for lower frequency signals.
AD8426
REF
100nF
100
10k
10
10nF
ADC0
ADC1
ADC2
AGND
3.3V
OPTION 1: DRIVING LOW FREQUENCY SIGNALS
OPTION 2: DRIVING HIGH FREQUENCY SIGNALS
OPTION 3: PROTECTING ADC FROM LARGE VOLTAGES
3.3V
AD8426
AD8616
ADuC7026
REF
3.3V
10
10nF
AD8426
AD8616
REF
+15V
–15V
AVDD
09
49
0-
0
65
Figure 72. Driving an ADC
相關(guān)PDF資料
PDF描述
AD8428BRZ IC OPAMP INST 3.5MHZ LN 8SOIC
AD8429BRZ-R7 IC OP AMP INST LOW NOISE 8SOIC
AD842JQ IC OPAMP GP 80MHZ 100MA 14CDIP
AD8432ACPZ-R7 IC OPAMP VF DUAL LN LP 24LFCSP
AD843SQ IC OPAMP GP 34MHZ 50MA 8CDIP
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AD8426ACPZ-R7_PROMO 制造商:Analog Devices 功能描述:IC INSTR AMP 1MHZ 80DB LFC
AD8426ACPZ-WP 功能描述:IC AMP INSTR RR 1.5MHZ 16LFCSP RoHS:是 類(lèi)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(lèi)型:通用 電路數(shù):4 輸出類(lèi)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(lèi)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(chēng):LM324ADTBR2G-NDLM324ADTBR2GOSTR
AD8426BCPZ-R7 功能描述:IC AMP INSTR RR 1.5MHZ 16LFCSP RoHS:是 類(lèi)別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:73 系列:Over-The-Top® 放大器類(lèi)型:通用 電路數(shù):4 輸出類(lèi)型:滿(mǎn)擺幅 轉(zhuǎn)換速率:0.07 V/µs 增益帶寬積:200kHz -3db帶寬:- 電流 - 輸入偏壓:1nA 電壓 - 輸入偏移:285µV 電流 - 電源:50µA 電流 - 輸出 / 通道:25mA 電壓 - 電源,單路/雙路(±):2 V ~ 44 V,±1 V ~ 22 V 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:16-WFDFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:16-DFN-EP(5x3) 包裝:管件
AD8426BCPZ-R7_PROMO 制造商:Analog Devices 功能描述:INSTR-AMPLIFIER 1MHZ 90DB L
AD8426BCPZ-WP 功能描述:IC AMP INSTR RR 1.5MHZ 16LFCSP RoHS:是 類(lèi)別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:150 系列:- 放大器類(lèi)型:音頻 電路數(shù):2 輸出類(lèi)型:- 轉(zhuǎn)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(lèi)型:表面貼裝 封裝/外殼:8-TSSOP(0.173",4.40mm 寬) 供應(yīng)商設(shè)備封裝:8-TSSOP 包裝:管件