AD8279 Datasheet, PDF (1/18 Pages) Analog Devices – Low Power, Wide Supply Range, Low Cost Difference Amplifiers, G = ½, 2

Low Power, Wide Supply Range,
Low Cost Difference Amplifiers, G = ½, 2
Preliminary Technical Data
AD8279
FEATURES
Wide input range beyond supplies
Rugged input overvoltage protection
Low supply current: 200 μA maximum
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)
Low offset voltage drift: ±2 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
APPLICATIONS
Voltage measurement and monitoring
Current measurement and monitoring
Instrumentation amplifier building block
Portable, battery-powered equipment
Test and measurement
GENERAL DESCRIPTION
The AD8279 consists of two general-purpose difference
amplifiers intended for precision signal conditioning in power
critical applications that require both high performance and low
power. The AD8279 provides exceptional common-mode
rejection ratio (80 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 extend to almost
triple the supply voltage (for G = ½), making them 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 AD8279 can be used as difference amplifiers with G = ½ or
G = 2. It 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 AD8279 provide an integrated
precision solution that has a smaller size, lower cost, and better
performance than a discrete alternative.
FUNCTIONAL BLOCK DIAGRAM
Figure 1.
The AD8279 operates 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 per channel, which is ideal for battery-operated and
portable systems.
The AD8279 is available in a 14-lead SOIC package. It is
specified for performance over the industrial temperature range
of −40°C to +85°C and are fully RoHS compliant.
Table 1. Difference Amplifiers by Category
Low
Distortion
AD8270
AD8271
AD8273
AD8274
AMP03
High
Voltage
AD628
AD629
Current
Sensing¹
AD8202 (U)
AD8203 (U)
AD8205 (B)
AD8206 (B)
AD8216 (B)
Low Power
AD8276
AD8277
AD8278
AD8279
1 _{U = unidirectional, B = bidirectional.}
Rev. PrA
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