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| 型號： | AD8251-EVALZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 1/24頁 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION FOR AD8251 PGA |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | iCMOS® |
| 每 IC 通道數(shù)： | 1 - 單 |
| 放大器類型： | 儀表 |
| 輸出類型： | 單端 |
| 轉(zhuǎn)換速率： | 20 V/µs |
| -3db帶寬： | 10MHz |
| 工作溫度： | -40°C ~ 85°C |
| 電流供應(yīng)（主 IC）： | 4.1mA |
| 電壓 - 電源，單路/雙路(±)： | 5 V ~ 15 V |
| 板類型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | AD8251 |
10 MHz, 20 V/μs, G = 1, 2, 4, 8 iCMOS
Programmable Gain Instrumentation Amplifier
AD8251
Rev. B
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringementsof patentsorother
rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
2007–2010 Analog Devices, Inc. All rights reserved.
FEATURES
Small package: 10-lead MSOP
Programmable gains: 1, 2, 4, 8
Digital or pin-programmable gain setting
Wide supply: ±5 V to ±15 V
Excellent dc performance
High CMRR: 98 dB (minimum), G = 8
Low gain drift: 10 ppm/°C (maximum)
Low offset drift: 1.8 μV/°C (maximum), G = 8
Excellent ac performance
Fast settling time: 785 ns to 0.001% (maximum)
High slew rate: 20 V/μs (minimum)
Low distortion: 110 dB THD at 1 kHz, 10 V swing
High CMRR over frequency: 80 dB to 50 kHz (minimum)
Low noise: 18 nV/√Hz, G = 8 (maximum)
Low power: 4.1 mA
APPLICATIONS
Data acquisition
Biomedical analysis
Test and measurement
GENERAL DESCRIPTION
The AD8251 is an instrumentation amplifier with digitally
programmable gains that has GΩ input impedance, low output
noise, and low distortion, making it suitable for interfacing with
sensors and driving high sample rate analog-to-digital converters
(ADCs). It has a high bandwidth of 10 MHz, low THD of 110 dB,
and fast settling time of 785 ns (maximum) to 0.001%. Offset
drift and gain drift are guaranteed to 1.8 μV/°C and 10 ppm/°C,
respectively, for G = 8. In addition to its wide input common
voltage range, it boasts a high common-mode rejection of 80 dB
at G = 1 from dc to 50 kHz. The combination of precision dc
performance coupled with high speed capabilities makes the
AD8251 an excellent candidate for data acquisition. Furthermore,
this monolithic solution simplifies design and manufacturing
and boosts performance of instrumentation by maintaining a
tight match of internal resistors and amplifiers.
The AD8251 user interface consists of a parallel port that allows
users to set the gain in one of two ways (see Figure 1). A 2-bit word
sent via a bus can be latched using the WR input. An alternative is
to use the transparent gain mode where the state of the logic
levels at the gain port determines the gain.
FUNCTIONAL BLOCK DIAGRAM
A1
A0
DGND WR
AD8251
+VS
–VS
REF
OUT
+IN
LOGIC
–IN 1
10
8
3
7
4
5
6
2
9
06
28
7-
0
01
Figure 1.
25
–10
1k
100M
06
28
7-
0
02
FREQUENCY (Hz)
GA
IN
(
d
B
)
10k
100k
1M
10M
20
15
10
5
0
–5
G = 1
G = 2
G = 4
G = 8
Figure 2. Gain vs. Frequency
Table 1. Instrumentation Amplifiers by Category
General
Purpose
Zero Drift
Mil
Grade
Low
Power
High Speed
PGA
1 Rail-to-rail output.
The AD8251 is available in a 10-lead MSOP package and is
specified over the 40°C to +85°C temperature range, making it
an excellent solution for applications where size and packing
density are important considerations.
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