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參數(shù)資料
| 型號(hào)： | AD8225ARZ-RL |
| 廠商： | Analog Devices Inc |
| 文件頁(yè)數(shù)： | 5/16頁(yè) |
| 文件大小： | 0K |
| 描述： | IC AMP INST PREC LP LDRIFT 8SOIC |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 放大器類(lèi)型： | 儀表 |
| 電路數(shù)： | 1 |
| 轉(zhuǎn)換速率： | 5 V/µs |
| -3db帶寬： | 900kHz |
| 電流 - 輸入偏壓： | 500pA |
| 電壓 - 輸入偏移： | 50µV |
| 電流 - 電源： | 1.05mA |
| 電流 - 輸出 / 通道： | 18mA |
| 電壓 - 電源，單路/雙路(±)： | 3.4 V ~ 36 V，±1.7 V ~ 18 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類(lèi)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-SOIC |
| 包裝： | 帶卷 (TR) |
| 配用： | AD8225-EVALZ-ND - BOARD EVAL FOR AD8225 INSTR AMP |
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REV. A
AD8225
–13–
In the classical three op amp in amp topology shown in Figure 8,
gain is developed differentially between the two input amplifiers
A1 and A2, sacrificing CMV (common-mode voltage) range.
The gain of the in amp is typically 10 or less, and an additional
gain stage increases the overall gain to approximately 1000.
Gain developed in the input stage results in a trade-off in common-
mode voltage range, constraining the ability of the amplifier to
tolerate high dc electrode errors. Although the AD8225 is also
a three amplifier design, its gain of 5 is developed at the output
amplifier, improving the CMV range at the input. Using
±5V
supplies, the CMV range of the AD8225 is from –3.4 V to
+4 V, compared to –3.1 V to +3.8 V, a 7% improvement in
input headroom over conventional in amps with the same gain.
G = 5
AD8225
19.6k
301
100
OP77
G = 200
G = 5
AD8225
19.6k
301
100
OP77
G = 200
G = 5
AD8225
19.6k
301
100
OP77
G = 200
Figure 9. EKG Monitor Front End
Figure 9 illustrates how an AD8225 may be used in an EKG
front end. In a low cost system, the AD8225 can be connected to
the patient. If buffers are required, the AD8225 can replace the
expensive precision resistor network and op amp.
Figure 10 shows test waveforms observed from the circuit of
Figure 9.
CH 1 = 2V, CH 2 = 2V, CH 3 = 2V, H = 200ms
RA-LA 1
LA-LL 2
RA-LL 3
Figure 10. EKG Waveform Using Circuit of Figure 9
Benefits of Fast Slew Rates
At 5 V/
s, the slew rate of the AD8225 is as fast as many op amp
circuits. This is an advantage in systems applications using multiple
sensors. For example, an analog multiplexer (see Figure 11) may
be used to select pairs of leads connected to several sensors. If
the AD8225 drives an ADC, the acquisition time is constrained
by the ability of the in amp to settle to a stable level after a new
set of leads is selected. Fast slew rates contribute greatly to
this function, especially if the difference in input levels is large.
AD8225
S1A
S1B
S2A
S2B
S3A
S3B
S4A
S4B
0.2V, 2V
ADG409
1
4
DA
DB
REF
Figure 11. Connection to an ADG409 Analog MUX
Figure 12 illustrates the response of an AD8225 connected to
an ADG409 analog multiplexer in the circuit shown in Figure 11
at two signal levels. Two of the four MUX inputs are connected
to test dc levels. The remaining two are at ground potential so
that the output slews as the inputs A0 and A1 are addressed. As
can be seen, the output response settles well within 4
s of the
applied level.
CH 1 = 200mV, CH 2 = 2V, H = 500ns
LARGE SIGNAL
(2V/DIV)
SMALL SIGNAL
(200mV/DIV)
INPUT
SIGNAL
TRAN-
SITION
Figure 12. Slew Responses After MUX Selection
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD8225-EVAL | 制造商:Analog Devices 功能描述:AD8225 EVALUATION BOARD - Bulk 制造商:Rochester Electronics LLC 功能描述:AD8225 EVALUATION BOARD - Bulk |
| AD8225-EVALZ | 功能描述:BOARD EVAL FOR AD8225 INSTR AMP RoHS:是 類(lèi)別:編程器，開(kāi)發(fā)系統(tǒng) >> 評(píng)估板 - 運(yùn)算放大器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- |
| AD8226 | 制造商:AD 制造商全稱(chēng):Analog Devices 功能描述:Low Noise, Low Gain Drift, G = 2000 Instrumentation Amplifier |
| AD8226ARMZ | 功能描述:IC AMP INST R-R LP 13MA 8MSOP RoHS:是 類(lèi)別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 放大器類(lèi)型:通用 電路數(shù):2 輸出類(lèi)型:滿(mǎn)擺幅 轉(zhuǎn)換速率:1.8 V/µs 增益帶寬積:6.5MHz -3db帶寬:4.5MHz 電流 - 輸入偏壓:5nA 電壓 - 輸入偏移:100µV 電流 - 電源:65µA 電流 - 輸出 / 通道:35mA 電壓 - 電源，單路/雙路(±):1.8 V ~ 5.25 V，±0.9 V ~ 2.625 V 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬） 供應(yīng)商設(shè)備封裝:10-MSOP 包裝:管件 |
| AD8226ARMZ-R7 | 功能描述:IC AMP INST R-R LP 13MA 8MSOP RoHS:是 類(lèi)別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 產(chǎn)品培訓(xùn)模塊:Differential Circuit Design Techniques for Communication Applications 標(biāo)準(zhǔn)包裝:1 系列:- 放大器類(lèi)型:RF/IF 差分 電路數(shù):1 輸出類(lèi)型:差分 轉(zhuǎn)換速率:9800 V/µs 增益帶寬積:- -3db帶寬:2.9GHz 電流 - 輸入偏壓:3µA 電壓 - 輸入偏移:- 電流 - 電源:40mA 電流 - 輸出 / 通道:- 電壓 - 電源，單路/雙路(±):3 V ~ 3.6 V 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:16-VQFN 裸露焊盤(pán)，CSP 供應(yīng)商設(shè)備封裝:16-LFCSP-VQ 包裝:剪切帶 (CT) 產(chǎn)品目錄頁(yè)面:551 (CN2011-ZH PDF) 其它名稱(chēng):ADL5561ACPZ-R7CT |
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