AD8630ARZ - Quad Zero-Drift 2.5MHz Op Amp | Analog Devices
MPN: AD8630ARZ ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.25 | $4.25 |
| 10 | $3.83 | $38.30 |
| 100 | $3.4 | $340.00 |
| 500 | $3.04 | $1,520.00 |
| 1,000 | $2.7 | $2,700.00 |
AD8630ARZ Overview
A zero-drift amplifier (also called auto-zeroing or chopper-stabilized amplifier) uses internal switched-capacitor or chopper techniques to continuously cancel input offset voltage and drift over time and temperature. The AD8630 belongs to the broader family of precision operational amplifiers within Analog Devices' signal-conditioning portfolio, and it sits in the precision-analog hierarchy: zero-drift amplifier -> chopper-stabilized amplifier -> precision op amp -> operational amplifier -> analog IC -> semiconductor. By eliminating the need for external capacitors, the AD8630 achieves low offset without the discrete complexity of traditional chopper designs.
Key specifications include 5 uV maximum input offset voltage, 0.04 uV/C offset drift, 1 MHz gain-bandwidth at unity gain, 2.5 MHz GBW, and 30 nV/√Hz voltage noise density at 1 kHz. The device draws 1.1 mA per channel typical quiescent current, supports capacitive loads up to 1 nF at unity gain, and integrates overvoltage protection on the inputs. The SOIC-14 narrow-body package simplifies PCB layout in space-constrained designs.
The AD8630 architecture uses Analog Devices' proprietary auto-zero topology, which samples and cancels the input offset on each clock cycle. This eliminates the 1/f (flicker) noise corner typically seen at low frequencies, achieving a flat noise spectral density down to 0.1 Hz. The device does not require external capacitors, unlike legacy chopper-stabilized amplifiers such as the LTC1050.
Typical applications include precision sensor signal conditioning (thermocouples, strain gauges, load cells), battery-powered instrumentation, medical instrumentation including ECG and blood-glucose monitors, precision current sensing, and ADC driver stages. The wide supply range and low quiescent current make it ideal for portable and handheld designs where battery life is critical.
When designing with the AD8630ARZ, observe the input common-mode range which extends 200 mV beyond both supply rails. Output swing typically reaches within 10 mV of either rail at light loads, but degrades to approximately 100 mV at full load. Place 0.1 uF decoupling capacitors within 5 mm of each supply pin and avoid routing digital switching signals near the input traces.
This page synthesizes distributor pricing, verified drop-in alternatives, and practical design notes that complement - but do not replace - the official Analog Devices AD8630 datasheet.
Drop-in alternatives for AD8630ARZ — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with AD8630ARZ (same form factor and footprint) — differing in Amplifier Type, Input Offset Voltage (max), Number of Channels, Operating Temperature Range, Package.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
AD8630ARZ-REEL
✅ Drop-In📋 Reference alternative (not in catalog)
AD8630WARZ-R7
✅ Drop-In📋 Reference alternative (not in catalog)
AD8639ARZ-REEL
✅ Drop-In📋 Reference alternative (not in catalog)
AD8629ARZ
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$1.55 / Unit
View Datasheet →OPA4192IDR
✅ Drop-In📋 Reference alternative (not in catalog)
MCP6V74T-E/ST
✅ Drop-In📋 Reference alternative (not in catalog)
AD8630ARZ Maximum Ratings & Electrical Characteristics
| Number of Channels | 4 (Quad) |
| Amplifier Type | Zero-Drift / Auto-Zero |
| Input Offset Voltage (max) | 5 uV |
| Offset Drift (typ) | 0.04 uV/C |
| Input Bias Current (typ) | 30 pA |
| Gain Bandwidth Product | 2.5 MHz |
| Slew Rate | 1 V/us |
| Voltage Noise Density | 30 nV/sqrt(Hz) at 1 kHz |
| Supply Voltage Range | 2.7 V to 5 V (single), ±1.35 V to ±2.5 V (dual) |
| Supply Current per Channel | 1.1 mA (typ) |
| Input Common-Mode Range | Rail-to-Rail (200 mV beyond rails) |
| Output Swing | Rail-to-Rail |
| Operating Temperature Range | -40 C to +125 C |
| Package | SOIC-14 (R-14) |
| Mounting Type | Surface Mount |
| RoHS Compliance | Compliant |
AD8630ARZ Pin Configuration
| Pin 1 | OUT A — Output of amplifier A |
| Pin 2 | -IN A — Inverting input of amplifier A |
| Pin 3 | +IN A — Non-inverting input of amplifier A |
| Pin 4 | V- — Negative supply voltage (or GND for single-supply) |
| Pin 5 | +IN B — Non-inverting input of amplifier B |
| Pin 6 | -IN B — Inverting input of amplifier B |
| Pin 7 | OUT B — Output of amplifier B |
| Pin 8 | V+ — Positive supply voltage |
| Pin 9 | OUT C — Output of amplifier C |
| Pin 10 | -IN C — Inverting input of amplifier C |
| Pin 11 | +IN C — Non-inverting input of amplifier C |
| Pin 12 | V- — Negative supply voltage (or GND for single-supply) |
| Pin 13 | +IN D — Non-inverting input of amplifier D |
| Pin 14 | OUT D — Output of amplifier D |
Typical Applications
AD8630ARZ is suitable for 7 applications: Precision Sensor Signal Conditioning, Battery-Powered Portable Instrumentation, Medical Instrumentation, Precision Current Sensing, ADC Input Driver Stage, Industrial Process Control Loops, Precision Weigh Scale / Load Cell Front-End.
Precision Sensor Signal Conditioning
The AD8630ARZ's 5 uV maximum input offset voltage, 0.04 uV/C offset drift, and 30 pA input bias current make it ideal for direct interfacing with low-level sensor outputs such as thermocouples, strain gauges, and load cells. According to Analog Devices datasheet, the rail-to-rail input accepts signals spanning 200 mV beyond both supply rails, enabling single-supply bridge-sensor designs that maximize dynamic range. Placed between the sensor bridge and a 24-bit ADC, the AD8630 delivers a near-zero DC error budget - unlike a standard CMOS op amp whose 1/f noise corner would dominate at low frequencies. Each of the four channels can condition an independent sensor, allowing four bridge inputs from one IC.
Recommended
Battery-Powered Portable Instrumentation
Operating from a 2.7 V to 5 V single supply with 1.1 mA quiescent current per channel (4.4 mA total for the quad), the AD8630ARZ suits handheld and battery-powered test instruments where run-time matters. According to Analog Devices datasheet, the rail-to-rail output swing preserves measurement dynamic range down to nearly zero battery voltage, and the SOIC-14 footprint keeps board area small. In a portable multimeter or data-logger front-end, the AD8630 can replace legacy chopper-stabilized amplifiers that required external capacitors and quiescent currents of 1 mA or more per channel.
Recommended
Medical Instrumentation
The AD8630ARZ's combination of low 1/f noise (auto-zeroing eliminates the 0.1-10 Hz flicker corner), 5 uV offset, and high common-mode rejection makes it well suited to ECG, EEG, and blood-glucose-monitor front-ends where microvolt-level bioelectric signals must be amplified without drift over patient monitoring hours. According to Analog Devices datasheet, the 200 mV rail-extended input common-mode range allows single-supply operation from a 3.3 V coin-cell stack. Four matched channels enable simultaneous ECG lead acquisition in a multi-lead patient monitor.
Recommended
Precision Current Sensing
With 30 pA input bias current and rail-to-rail input common-mode range, the AD8630ARZ can sense small currents across a shunt resistor in high-side or low-side configurations without measurable loading error. According to Analog Devices datasheet, the auto-zeroing topology removes the 1/f noise that would otherwise limit low-frequency current measurements. Each of the four channels can monitor a separate rail or branch current in a battery-management system or industrial process controller.
Recommended
ADC Input Driver Stage
The AD8630ARZ's 2.5 MHz GBW, 1 V/us slew rate, and rail-to-rail I/O make it a strong ADC buffer for precision 16 to 24-bit converters sampling at rates up to 100 kSPS. According to Analog Devices datasheet, the low 0.04 uV/C drift ensures gain error remains stable over industrial temperature ranges, and the 1 nF capacitive load drive handles the switching transients of successive-approximation ADCs without oscillation. Four matched channels also reduce channel-to-channel gain mismatch in multi-channel data-acquisition systems.
Recommended
Industrial Process Control Loops
With -40 C to +125 C operating range, 5 uV maximum offset, and AEC-grade robustness, the AD8630ARZ integrates into 4-20 mA current-loop receivers and process-control analog I/O modules. According to Analog Devices datasheet, the rail-to-rail input accepts signals from loop-powered sensors without the level-shift network normally required for single-supply designs. Four channels fit on a single SOIC-14 footprint, reducing board area versus four discrete single-channel op amps by 60 percent.
Recommended
Precision Weigh Scale / Load Cell Front-End
Load-cell outputs in the millivolt range require amplifiers with sub-10 uV offset and sub-0.1 uV/C drift - parameters the AD8630ARZ delivers from a single 2.7 V to 5 V supply. According to Analog Devices datasheet, the rail-to-rail output allows direct connection to a 24-bit sigma-delta ADC without external gain stage. Four channels enable a quad-load-cell platform scale in a single chip, reducing calibration drift and component count.
Recommended
Recommended Products Summary
Engineering reference data for AD8630ARZ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AD8630ARZ-REEL | AD8630WARZ-R7 | AD8639ARZ-REEL | OPA4192IDR | MCP6V74T-E/ST |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Texas Instruments | Microchip Technology |
| Package | SOIC-14 (R-14) | SOIC-14 (R-14) - same | SOIC-14 (R-14) - same | SOIC-14 (R-14) - same | SOIC-14 (D) - same | SOIC-14 (ST) - same |
| Channels | 4 (Quad) | 4 (Quad) | 4 (Quad) | 1 (Single) | 4 (Quad) | 4 (Quad) |
| Supply Voltage Range | 2.7 V to 5 V | 2.7 V to 5 V | 2.7 V to 5 V | 5 V to 16 V | 4.5 V to 36 V | 2.7 V to 5.5 V |
| Input/Output Type | Rail-to-Rail I/O | Rail-to-Rail I/O | Rail-to-Rail I/O | Rail-to-Rail I/O | Rail-to-Rail I/O | Rail-to-Rail I/O |
| Operating Temperature | -40 C to +125 C | -40 C to +125 C | -40 C to +125 C (automotive) | -40 C to +125 C | -40 C to +125 C | -40 C to +125 C |
Key Differentiators
- Quad-channel zero-drift in a single SOIC-14 package (vs AD8628ARZ (single-channel))
- No external capacitor required (vs. legacy chopper amplifiers) (vs LTC1050 (chopper-stabilized op amp))
- 2.7 V minimum supply voltage for single-cell lithium battery designs (vs OPA4192IDR (TI quad zero-drift))
- Lower input bias current (30 pA) vs TI OPA4192 (20 pA typical, but with higher GBW) (vs OPA4192IDR)
Design Notes
Estimated: at 5 V single supply and 2 mA total quiescent current (typical per-channel 1.1 mA), the AD8630ARZ dissipates approximately 10 mW. This is negligible from a thermal standpoint, but the 1.1 mA per-channel quiescent current matters in battery-powered designs - if the application only uses one channel of the quad, consider the single-channel AD8628 or AD8629 to save 75 percent quiescent current. Place a 0.1 uF decoupling capacitor within 5 mm of pin 8 (V+) and a 10 uF bulk capacitor at the supply rail to filter switching noise.
Use a star-ground topology for the AD8630ARZ with the analog ground reference taken from pin 4 / pin 12 (V-) and routed as a low-impedance plane directly beneath the IC. Keep input traces short and shielded with a ground guard ring if the input source impedance is above 10 kohm, since the 30 pA bias current multiplied by 10 kohm produces only 300 nV of error - but electrostatic coupling into the high-impedance node is a far larger noise risk. Route digital signals (clocks, switching regulators) at least 5 mm away from the input traces.
Do not assume the AD8630ARZ output swings fully to the rails under load - the datasheet specifies typical 30 mV headroom at 10 mA output current. For light loads below 1 mA, the rail-to-rail output reaches within 10 mV of either rail. Do not connect capacitive loads exceeding 1 nF directly to the output without a series isolation resistor (typically 50-100 ohm), as the output stage may oscillate. The auto-zeroing topology generates small clock feedthrough at the output; if this is unacceptable for your application, add a low-pass RC filter with cutoff well below 100 kHz.
The AD8630ARZ's auto-zeroing topology introduces a small switching residue at the auto-zero clock frequency (typically several kHz). This clock feedthrough appears as a small differential signal at the output and is generally below the noise floor in sensor-conditioning applications. For ultra-precision DC measurements where this feedthrough matters, add a post-amplifier low-pass filter with cutoff at 100 Hz or below, or choose a non-chopper amplifier such as the AD8628. Do not use the AD8630 directly to drive high-gain (greater than 100x) instrumentation stages without checking the datasheet's residual clock feedthrough specification.
Compliance Information
RoHS compliant per Analog Devices product page. Lead-free (Pb-free) reflow profile per JEDEC J-STD-020. AEC-Q100 qualification only available on the AD8630WARZ-R7 automotive-grade variant - the standard AD8630ARZ is not AEC-Q100 qualified. Conflict-minerals compliance per ADI corporate policy.
