Data Sheet
FEATURES Low Power, Wide Supply Range, Low Cost Unity-Gain Difference Amplifiers AD8276/AD8277
FUNCTIONAL BLOCK DIAGRAM
+VS
7 Wide input range beyond supplies Rugged input overvoltage protection Low supply current: 200 A maximum per channel Low power dissipation: 0.5 mW at VS = 2.5 V Bandwidth: 550 kHz CMRR: 86 dB minimum, dc to 10 kHz Low offset voltage drift: ±2 V/°C maximum (B Grade) Low gain drift: 1 ppm/°C maximum (B Grade) Enhanced slew rate: 1.1 V/s Wide power supply range: Single supply: 2 V to 36 V Dual supplies: ±2 V to ±18 V AD8276
IN 2 40k 40k
5 SENSE 6 OUT +IN 3 40k 40k 1 REF
07692-001 4 VS Figure 1. AD8276
+VS
11 APPLICATIONS
Voltage measurement and monitoring Current measurement and monitoring Differential output instrumentation amplifier Portable, battery-powered equipment Test and measurement
INA 2 40k AD8277
40k
12 SENSEA 13 OUTA +INA 3 40k 40k 14 REFA GENERAL DESCRIPTION
The AD8276/AD8277 are general-purpose, unity-gain difference amplifiers intended for precision signal conditioning in power critical applications that require both high performance and low power. They provide exceptional common-mode rejection ratio (86 dB) and high bandwidth while amplifying signals 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. The common-mode range of the amplifiers extends to almost double the supply voltage, making these amplifiers ideal for singlesupply 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 amps. The AD8276/AD8277 are unity-gain stable. While they are optimized for use as difference amplifiers, they can also be connected in high precision, single-ended configurations with G = -1, +1, +2. The AD8276/AD8277 provide an integrated precision solution that has smaller size, lower cost, and better performance than a discrete alternative. The AD8276/AD8277 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 A per channel, which is ideal for batteryoperated and portable systems.
INB 6 40k 40k
10 SENSEB 9 OUTB +INB 5 40k 40k 8 REFB
07692-052 4 VS Figure 2. AD8277 Table 1. Difference Amplifiers by Category
Low Distortion AD8270 AD8271 AD8273 AD8274 AMP03
1 High Voltage AD628 AD629 Current Sensing1 AD8202 (U) AD8203 (U) AD8205 (B) AD8206 (B) AD8216 (B) Low Power AD8276 AD8277 AD8278 U = unidirectional, B = bidirectional. The AD8276 is …