AD8657ARMZ-R7 Complete Datasheet Summary

1. Basic Device Information

• Part Number: AD8657ARMZ-R7
• Device Type: Dual Micropower Precision Rail-to-Rail Input/Output (RRIO) CMOS Op Amp
• Manufacturer: Analog Devices Inc.
• Document Revision: Rev. C
• Package: 8-Lead MSOP (RM-8), 3.0 mm × 3.0 mm
• Packaging: Tape-and-Reel (R7), 2500 units per reel
• RoHS Status: Compliant (Z suffix)
• Marking Code: A2N
• Temperature Range: Extended Industrial, −40°C to +125°C
• Key Application: Low-power, wide-supply, high-precision analog signal conditioning

2. Key Features

• Micropower operation: 18 μA typical, 22 μA max per amplifier (at 18 V)
• Wide supply range:
• Ultra-low offset voltage: 350 μV max
• Ultra-low input bias current: 20 pA max
• Gain Bandwidth Product (GBP): 230 kHz
• Unity-gain stable
• Rail-to-rail input and output swing
• Excellent EMI rejection: 90 dB typ
• DigiTrim® precision offset calibration
• No phase reversal

3. Typical Applications

• Portable battery-powered systems
• 4 mA–20 mA current loop transmitters
• Precision current monitors
• Sensor buffers & level shifters
• Low-power transimpedance amplifiers
• Remote/wireless sensor conditioners
• Multipole low-power filters

4. Pin Configuration (8-Lead MSOP, Top View)

5. Absolute Maximum Ratings

• Supply voltage (V+ to V−): 20.5 V
• Input voltage: (V− − 0.3 V) to (V+ + 0.3 V)
• Differential input voltage: ±VSY
• Continuous input current: ±10 mA
• Output short-circuit to GND: Indefinite
• Storage temperature: −65°C to +150°C
• Operating junction temperature: −40°C to +125°C
• ESD sensitive device

6. Recommended Operating Conditions

• Supply voltage: 2.7 V to 18 V (single) / ±1.35 V to ±9 V (dual)
• Ambient temperature: −40°C to +125°C
• Input common-mode range: 0 V to VSY
• Load resistance: ≥100 kΩ recommended

7. Key Electrical Specifications (VSY = 18 V, TA = 25°C)

Input

• Offset voltage (VOS): 350 μV max
• Input bias current (IB): 5 pA typ, 20 pA max
• Input offset current (IOS): 4 pA typ
• CMRR: 94 dB min, 110 dB typ
• Input resistance: 10 GΩ

Output

• Output swing high: 17.97 V min (to V+)
• Output swing low: 15 mV max (to V−)
• Short-circuit current: ±12 mA
• Output impedance: 15 Ω @ 1 kHz

Dynamic

• Slew rate: 80 V/ms typ
• Settling time (0.1%): 15 μs
• Unity-gain crossover: 230 kHz
• Phase margin: 60°
• Voltage noise density: 50 nV/√Hz @ 1 kHz

Power

• Supply current per amp: 18 μA typ, 22 μA max
• PSRR: 100 dB min

8. Functional Description

• Dual independent CMOS amplifiers with rail-to-rail I/O
• Patented DigiTrim® offset calibration post-packaging
• Dual differential input stage (PMOS/NMOS) for full rail input range
• Class AB output stage for rail-to-rail drive
• Input clamp diodes for overvoltage protection
• High EMI immunity suppresses RF rectification

9. Thermal Information (MSOP-8)

• Junction-to-ambient thermal resistance (θJA): 142°C/W
• Junction-to-case (θJC): 45°C/W

10. Package & Ordering

• Part Number: AD8657ARMZ-R7
• Package: 8-Lead MSOP (RM-8)
• Temperature: −40°C to +125°C
• RoHS compliant
• Quantity: 2500 per reel
• Marking: A2N

11. Layout & Design Guidelines

• Decouple V+ with 0.1 μF ceramic capacitor close to pin 8
• Use ≥100 kΩ feedback resistors to avoid output loading
• Avoid open-loop comparator use (may increase supply current)
• Keep input traces short to minimize EMI pickup