AD8505

The AD8235 belongs to AD8505/AD8506/AD8508 series which are single, dual, and quad micro- power amplifiers featuring rail-to-rail input/output swings while operating from a single 1.8 V to 5 V power supply or from dual ±0.9 V to ±2.5 V power supplies. The AD8505/AD8506/AD8508 are members of a growing series of zero crossover distortion op amps offered by Analog Devices, Inc., including the ADA4505-1/ADA4505-2/ADA4505-4, that operate from a single 1.8 V to 5 V supply or from dual ±0.9 V to ±2.5 V power supplies. Remote battery-powered sensors, handheld instrumentation, consumer equipment, hazard detection (for example, smoke, fire, and gas), and patient monitors can benefit from the features of the AD8505/AD8506/AD8508 amplifiers. Using a new circuit technology, these amplifiers offer zero input crossover distortion (excellent PSRR and CMRR performance)and low bias current while operating with a supply current of less than 20 A per amplifier. This combination of features makes the AD8505/AD8506/AD8508 amplifiers ideal choices for battery-powered applications because they minimize errors due to power supply voltage variations over the lifetime of the battery and maintain high CMRR even for a rail- to-rail input op amp. This amplifier family offers the lowest noise in its power class. The AD8505/AD8506/AD8508 are specified for both the industrial temperature range of -40°C to +85°C and the extended industrial temperature range of -40°C to +125°C. The AD8505 single ampli- fier is available in a tiny 5-lead SOT-23 and a 6-ball WLCSP packages. The AD8506 dual amplifier is available in 8-lead MSOP and 8-ball WLCSP packages. The AD8508 quad amplifier is available in 14-lead TSSOP and 14-ball WLCSP packages.

The features of AD8235 can be summarized as (1)PSRR: 100 dB minimum; (2)CMRR: 105 dB typical; (3)very low supply current: 20 A per amplifier maximum; (4)1.8 V to 5 V single supply or ±0.9 V to ±2.5 V dual supply; (5)rail-to-rail input/output; (6)low noise: 45 nV/Hz at 1 kHz; (7)2.5 mV offset voltage maximum; (8)very low input bias current: 1 pA typical.

The absolute maximum ratings of AD8235 are (1)supply voltage: 5.5 V; (2)input voltage: ±V SY ± 0.1 V; (3)input current: ±10 mA; (4)differential input voltage: ±V SY; (5)output short-circuit duration to GND: indefinite; (6)storage temperature range: -65°C to +150°C; (7)operating temperature range: -40°C to +125°C; (8)junction temperature range: -65°C to +150°C; (9)lead temperature (soldering, 60 sec): 300°C.