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參數(shù)資料
| 型號(hào)： | AD8426BCPZ-R7 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 20/28頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP INSTR RR 1.5MHZ 16LFCSP |
| 標(biāo)準(zhǔn)包裝： | 1,500 |
| 放大器類型： | 儀表 |
| 電路數(shù)： | 2 |
| 輸出類型： | 滿擺幅 |
| 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： | 100µV |
| 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： | 帶卷 (TR) |
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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
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| 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 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:150 系列:- 放大器類型:音頻 電路數(shù):2 輸出類型:- 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 |
| AD8428 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Low Noise, Low Gain Drift, G = 2000 |
| AD8428_12 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Low Noise, Low Gain Drift, G = 2000 |
| AD8428ARZ | 功能描述:IC AMP INSTRUMENTATON 8SOIC RoHS:是 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:0.028 V/µs 增益帶寬積:105kHz -3db帶寬:- 電流 - 輸入偏壓:3nA 電壓 - 輸入偏移:100µV 電流 - 電源:3.3µA 電流 - 輸出 / 通道:12mA 電壓 - 電源，單路/雙路(±):2.7 V ~ 12 V，±1.35 V ~ 6 V 工作溫度:-40°C ~ 85°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:剪切帶 (CT) 其它名稱:OP481GRUZ-REELCT |
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