Single-Supply, Rail-to-Rail Low Power FET-Input Op Amp AD822

FEATURES

• True single-supply operation
  • Output swings rail-to-rail
  • Input voltage range extends below ground
  • Single-supply capability from 3 V to 36 V
  • Dual-supply capability from ±1.5 V to ±18 V
• High load drive
  • Capacitive load drive of 350 pF, G = +1
  • Minimum output current of 15 mA
• Excellent ac performance for low power
  • 800 μA maximum quiescent current per amplifier
  • Unity gain bandwidth: 1.8 MHz
  • Slew rate of 3.0 V/μs
• Good dc performance
  • 800 μV maximum input offset voltage
  • 2 μV/°C typical offset voltage drift
  • 25 pA maximum input bias current
• Low noise
  • 13 nV/√Hz @ 10 kHz
  • No phase inversion

APPLICATIONS

• Battery-powered precision instrumentation
• Photodiode preamps
• Active filters
• 12-bit to 14-bit data acquisition systems
• Medical instrumentation
• Low power references and regulators

CONNECTION DIAGRAM

Figure 1. 8-Lead PDIP (N Suffix); 8-Lead MSOP (RM Suffix); and 8-Lead SOIC (R Suffix)

GENERAL DESCRIPTION

The AD822 is a dual precision, low power FET input op amp that can operate from a single supply of 3.0 V to 36 V or dual supplies of ±1.5 V to ±18 V. It has true single-supply capability with an input voltage range extending below the negative rail, allowing the AD822 to accommodate input signals below ground in the single-supply mode. Output voltage swing extends to within 10 mV of each rail, providing the maximum output dynamic range.

Figure 2. Input Voltage Noise vs. Frequency

Offset voltage of 800 μV maximum, offset voltage drift of 2 μV/°C, input bias currents below 25 pA, and low input voltage noise provide dc precision with source impedances up to a gigaohm. The 1.8 MHz unity gain bandwidth, –93 dB THD at 10 kHz, and 3 V/μs slew rate are provided with a low supply current of 800 μA per amplifier.

GENERAL DESCRIPTION

The AD822 drives up to 350 pF of direct capacitive load as a follower and provides a minimum output current of 15 mA. This allows the amplifier to handle a wide range of load conditions. Its combination of ac and dc performance, plus the outstanding load drive capability, results in an exceptionally versatile amplifier for the single-supply user.

The AD822 is available in two performance grades. The A grade and B grade are rated over the industrial temperature range of −40°C to +85°C.

The AD822 is offered in three varieties of 8-lead packages: PDIP, MSOP, and SOIC.

Figure 3. Gain-of-2 Amplifier; VS = 5, 0, VIN = 2.5 V Sine Centered at 1.25 V, RL = 100 Ω

ABSOLUTE MAXIMUM RATINGS

1 8-lead PDIP package: θ_JA = 90°C/W.

8-lead SOIC package: θ_JA = 160°C/W.

8-lead MSOP package: θ_JA = 190°C/W.

Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

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