AD8279 Low Power, Wide Supply Range, Low Cost Difference Amplifiers, G = ½, 2

The AD8278 and AD8279 are general-purpose difference amplifiers intended for precision signal conditioning in power critical applications that require both high performance and low power. The AD8278 and AD8279 provide exceptional common-mode rejection ratio (80 dB) and high bandwidth while amplifying input signals that are well beyond the supply rails. The on-chip resistors are laser trimmed for excellent gain accuracy and high CMRR. They also have extremely low gain drift vs. temperature. Voltage measurement and monitoring Current measurement and monitoring Instrumentation amplifier building block Portable, battery-powered equipment Test and measurement

The common-mode range of the amplifier extends to almost triple the supply voltage (for G = ½), making the amplifer ideal for single-supply applications that require a high common-mode voltage range. The internal resistors and ESD circuitry at the inputs also provide overvoltage protection to the op amp.

The AD8278 and AD8279 can be used as difference amplifiers with G = ½ or G = 2. They can also be connected in a high precision, single-ended configuration for non inverting and inverting gains of −½, −2, +3, +2, +1½, +1, or +½. The AD8278 and AD8279 provide an integrated precision solution that has a smaller size, lower cost, and better performance than a discrete alternative.

The AD8278 and AD8279 operate on single supplies (2.0 V to 36 V) or dual supplies (±2 V to ±18 V). The maximum quiescent supply current is 200 μA, which is ideal for battery-operated and portable systems. For unity-gain difference amplifiers with similar performance, refer to the AD8276 and AD8277 data sheets.

The AD8278 is available in the space-saving 8-lead MSOP and SOIC packages, and the AD8279 is offered in a 14-lead SOIC package. Both are specified for performance over the industrial temperature range of −40°C to +85°C and are fully RoHS compliant.

Applications

Features and Benefits

Wide input range beyond supplies

Rugged input overvoltage protection

Low supply current: 200 μA maximum (per amplifier)

Low power dissipation:

0.5 mW at VS = 2.5 V

Bandwidth: 1 MHz (G = ½)

CMRR: 80 dB minimum,
dc to 20 kHz (G = ½, B Grade)

Low offset voltage drift: ±1 μV/°C maximum (B Grade)

Low gain drift: 1 ppm/°C maximum (B Grade)

Enhanced slew rate: 1.4 V/μs

Wide power supply range
Single supply: 2 V to 36 V
Dual supplies: ±2 V to ±18 V

8-lead SOIC, 14-lead SOIC, and MSOP packages

Amplifiers

SPICE Models

AD8279 SPICE Macro Model .CIR

Data Sheets

Document	note
AD8278/AD8279: Low Power, Wide Supply Range, Low Cost Difference Amplifiers, G = ½, 2 Data Sheet (Rev. C)	PDF 656 kB

User Guides

Document	note
UG-744: Evaluating the AD8273/AD8277/AD8279	PDF 1.01 M

Order Information

Part Number	Package	Packing Qty	Temp Range	Price 100-499	Price 1000+	RoHS
AD8279ARZ Production	14 ld SOIC	OTH 56	-40 to 85C	1.92	1.6	Y
AD8279ARZ-R7 Production	14 ld SOIC	REEL 1000	-40 to 85C	0	1.6	Y
AD8279ARZ-RL Production	14 ld SOIC	REEL 2500	-40 to 85C	0	1.6	Y
AD8279BRZ Production	14 ld SOIC	OTH 56	-40 to 85C	2.82	2.35	Y
AD8279BRZ-R7 Production	14 ld SOIC	REEL 1000	-40 to 85C	0	2.35	Y
AD8279BRZ-RL Production	14 ld SOIC	REEL 2500	-40 to 85C	0	2.35	Y

Evaluation Boards

Part Number	Description	Price	RoHS
AD8273-EVALZ	Evaluation Board for 14-Lead SOIC	125	Y
AD8277-EVALZ	Evaluation Board for 14-Lead SOIC	125	Y
AD8279-EVALZ	Evaluation Board for 14-Lead SOIC	125	Y

AD8278/AD8279: Low Power, Wide Supply Range, Low Cost Difference Amplifiers, G = ½, 2 Data Sheet (Rev. C) ad8278

AD8279 SPICE Macro Model ad8279

UG-744: Evaluating the AD8273/AD8277/AD8279 ad8273