AD8251 10 MHz, G = 1, 2, 4, 8 iCMOS® Programmable Gain Instrumentation Amplifier

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 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. Data acquisition Biomedical analysis Test and measurement

The AD8251 user interface consists of a parallel port that allows users to set the gain in one of two different ways (see Figure 1 in data sheet for the functional block diagram). A 2-bit word sent via a bus can be latched using the WR input. An alternative is to use transparent gain mode where the state of logic levels at the gain port determines the gain.

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.

Features and Benefits

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

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 = 10 (maximum)

Low power: 4 mA

Amplifiers

Instrumentation Amplifiers

SPICE Models

AD8251 SPICE Macro Model .CIR

Data Sheets

Document	note
AD8251: 10 MHz, 20 V/μs, G = 1, 2, 4, 8 iCMOS Programmable Gain Instrumentation Amplifier Data Sheet (Rev. B)	PDF 626 kB

User Guides

Document	note
UG-925: Evaluating the AD8251 10 MHz, 20 V/μs, G = 1, 2, 4, 8 iCMOS Programmable Gain Instrumentation Amplifier (Rev. A)	PDF 328.59 K

Technical Books

Document	note

Order Information

Part Number	Package	Packing Qty	Temp Range	Price 100-499	Price 1000+	RoHS
AD8251ARMZ Production	10 ld MSOP	OTH 50	-40 to 85C	5.96	5.01	Y
AD8251ARMZ-R7 Production	10 ld MSOP	REEL 1000	-40 to 85C	0	5.01	Y
AD8251ARMZ-RL Production	10 ld MSOP	REEL 3000	-40 to 85C	0	5.01	Y