ADA4807-4ARUZ is a quad, rail-to-rail input and output (RRIO), low-noise, high-speed operational amplifier designed and manufactured by Analog Devices Inc. (ADI). It belongs to the ultra-low-power, precision ADA4807 family, engineered specifically for high-fidelity signal conditioning in portable instrumentation, medical devices, data acquisition systems, and battery-powered sensors, where exceptional DC accuracy, low power consumption, wide bandwidth, and true rail-to-rail operation are simultaneously required.
The “ARUZ” suffix denotes the 16-lead TSSOP package (5 mm × 4.4 mm) — a compact, surface-mount, RoHS-compliant, and widely manufacturable package; qualified for industrial temperature range (–40°C to +125°C junction temperature).
â ī¸ Critical Clarification:
The ADA4807-4 is not a general-purpose op-amp like the LM358 or even a standard low-noise amplifier like the AD8675. It uniquely combines:
- Ultra-low power: Just 1 mA per amplifier (4 mA total) quiescent current, yet delivers 200 MHz gain-bandwidth product (GBWP) and 120 V/µs slew rate — an industry-leading power-to-performance ratio;
- True rail-to-rail input and output (RRIO): Input common-mode range extends 200 mV beyond both rails, and output swings within 25 mV of each rail (at 10 kΩ load) — enabling full dynamic range utilization from low-voltage supplies (e.g., 3.3 V or even 2.7 V);
- Outstanding DC precision: 0.1 mV max offset voltage (B-grade), 0.3 µV/°C max drift, and < 1 nA max input bias current, making it suitable for precision transimpedance, strain gauge, and RTD amplifiers without trimming;
- Low noise & high speed: 3.9 nV/√Hz input voltage noise at 10 kHz and 1.4 pA/√Hz current noise, with 120 V/µs slew rate, supporting accurate amplification of fast, low-amplitude signals (e.g., ECG pulses, piezoelectric outputs, photodiode currents);
- Robust, integrated protection: Internal RF/EMI filtering, overvoltage protection up to ±10 V on inputs, and unity-gain stable — no external compensation required.
It operates from a single 2.7 V to 10 V supply (or dual ±1.35 V to ±5 V), supports gain configurations from –1 to ≥1000, and features low distortion (–115 dB THD @ 1 kHz) — all in a single 16-pin TSSOP.
Introduction
The ADA4807-4ARUZ redefines the trade-off between speed, precision, and power efficiency:
đš Precision analog front-end in one quad IC: Replaces four discrete op-amps (e.g., OP1177 + AD8065), reducing PCB area by >60%, eliminating matching errors, and cutting BOM cost — ideal for multi-channel DAQ, portable EEG/ECG, and 4–20 mA transmitter modules;
đš Battery life extended by 3× vs. comparable-speed amps: At only 4 mA total IQ, it enables >1-year operation on two AA cells while maintaining 200 MHz GBWP — far superior to alternatives like the OPA4830 (10 mA, 210 MHz) or LTC6229 (6.5 mA, 890 MHz);
đš True low-voltage fidelity: With RRIO operation down to 2.7 V single supply, it preserves >98% of ADC input range when driving 16-bit SAR or sigma-delta converters — critical for maximizing ENOB in portable DMMs and handheld spectrometers;
đš Plug-and-play reliability: Unity-gain stable, internal EMI filters, and ±10 V input overvoltage tolerance eliminate need for external clamping, compensation, or shielding — accelerating design validation and field reliability.
Its 16-lead TSSOP (ARUZ) package (5 mm × 4.4 mm) offers excellent thermal performance (θJA ≈ 110°C/W), compatibility with standard reflow profiles, and ease of optical inspection — making it a production favorite for high-volume medical, industrial, and consumer applications.
Key Features
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High-Speed, Low-Power Precision:
• Gain-bandwidth product (GBWP): 200 MHz (typ.), 180 MHz (min);
• Slew rate: 120 V/µs (typ.), 100 V/µs (min);
• Quiescent current per amplifier: 1 mA (typ.), 1.2 mA (max) → 4 mA total for quad;
• Supply voltage range: 2.7 V to 10 V (single) or ±1.35 V to ±5 V (dual).
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Rail-to-Rail Input & Output (RRIO):
• Input common-mode range: –0.2 V to VS + 0.2 V, i.e., extends 200 mV beyond both rails;
• Output swing: Within 25 mV of each rail (at 10 kΩ load), 50 mV (at 600 Ω);
• Output voltage noise: 3.9 nV/√Hz @ 10 kHz, 7.9 nV/√Hz @ 100 kHz;
• Input current noise: 1.4 pA/√Hz @ 10 kHz.
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Exceptional DC Accuracy & Stability:
• Input offset voltage: 0.1 mV (max, B-grade), 0.05 mV (typ.);
• Offset voltage drift: 0.3 µV/°C (max), 0.1 µV/°C (typ.);
• Input bias current: < 1 nA (max), 0.2 nA (typ.);
• Open-loop gain (AOL): 120 dB (min), 130 dB (typ.).
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Robustness & Ease of Use:
• Unity-gain stable: No external compensation needed — works flawlessly in follower, inverter, or integrator configurations;
• Input overvoltage protection: Withstands ±10 V differential or common-mode input beyond rails;
• Integrated RF/EMI filtering: Rejects cellular, Wi-Fi, and Bluetooth interference without external RC networks;
• Shutdown mode: Available in pin-compatible variants (e.g., ADA4807-4ACPZ-R7) — not on ARUZ, but useful for system-level power gating.
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TSSOP-16 (ARUZ) Package & Industrial Qualification:
• 16-Lead TSSOP (5 mm × 4.4 mm);
• RoHS-compliant, halogen-free;
• JEDEC J-STD-020 moisture sensitivity level (MSL) 1 — unlimited floor life;
• Operating junction temperature: –40°C to +125°C.
Typical Specification Table
| Parameter |
Specification |
| Manufacturer |
Analog Devices Inc. (ADI) |
| Product Series |
ADA4807 Family (Low-Power, High-Speed RRIO Op-Amps) |
| Model |
ADA4807-4ARUZ |
| Function |
Quad Rail-to-Rail I/O Op-Amp |
| Gain-Bandwidth Product |
200 MHz (typ.), 180 MHz (min) |
| Slew Rate |
120 V/µs (typ.), 100 V/µs (min) |
| Quiescent Current (per amp) |
1 mA (typ.), 1.2 mA (max) |
| Total IQ (quad) |
4 mA (typ.), 4.8 mA (max) |
| Supply Voltage Range |
2.7 V to 10 V (single), ±1.35 V to ±5 V (dual) |
| Input Offset Voltage (B) |
0.1 mV (max), 0.05 mV (typ.) |
| Offset Drift |
0.3 µV/°C (max), 0.1 µV/°C (typ.) |
| Input Bias Current |
< 1 nA (max), 0.2 nA (typ.) |
| Input Voltage Noise @ 10 kHz |
3.9 nV/√Hz |
| Output Swing (10 kΩ) |
Within 25 mV of each rail |
| Package |
16-Lead TSSOP (5 mm × 4.4 mm) (ARUZ) |
| RoHS / Green |
Yes (Pb-free, Halogen-free) |
| Operating Junction Temp. |
–40°C to +125°C |
Typical Applications
đš Portable Medical Devices: Multi-channel ECG/EEG front-ends, portable ultrasound receivers, and glucose meter analog front-ends — leveraging low power, RRIO, and low noise for sub-mV biopotential amplification.
đš Industrial Sensor Signal Conditioning: 4–20 mA transmitter circuits, strain gauge bridges, RTD amplifiers, and pressure sensor interfaces — enabled by low offset/drift, high CMRR (>110 dB), and robust overvoltage tolerance.
đš Data Acquisition Systems (DAQ): 16–18-bit SAR and sigma-delta ADC drivers, multiplexed sensor buffers, and anti-aliasing filters — benefiting from 200 MHz GBWP, 120 V/µs slew rate, and unity-gain stability.
đš Battery-Powered Test Equipment: Handheld DMMs, portable oscilloscopes, and field calibrators — where 4 mA total IQ enables >1-year operation on AA/AAA cells while preserving SNR and bandwidth.
đš Photodiode & Piezoelectric Amplifiers: Transimpedance amplifiers (TIAs) for optical sensors and charge amplifiers for vibration sensors — supported by low input bias current (<1 nA) and low current noise (1.4 pA/√Hz).
đš Active Filters & Precision References: 4th-order Butterworth filters, reference buffers for DACs/ADCs (e.g., AD7694, AD7195), and low-drift voltage followers — using high open-loop gain (130 dB) and rail-to-rail output swing.
Development & Design Notes
đ§ PCB Layout Best Practices:
- Place feedback resistors and capacitors as close as possible to the op-amp pins — minimize parasitic capacitance and trace inductance that degrade stability and bandwidth.
- Use ground guard rings around inverting/non-inverting inputs — especially critical for TIAs and high-gain configurations.
- Keep power traces short and wide — route AVDD/DVDD with ≥ 15-mil width and place decoupling caps within 2 mm of each supply pin.
đ§ Power Supply Decoupling:
- Use 10 µF tantalum + 100 nF ceramic capacitor on each supply rail (V+ and V−), placed within 2 mm of respective pins;
- For high-frequency stability: add a 1 nF C0G capacitor in parallel with the 100 nF cap — improves PSRR above 10 MHz and suppresses ringing.
đ§ Noise & Stability Optimization:
- For TIA designs: use low-capacitance photodiodes and keep feedback resistor < 1 MΩ unless compensated with feedback capacitor (e.g., 0.3 pF for 100 kΩ RF).
- For unity-gain follower: add a 10 Ω series resistor in the feedback path — dampens peaking caused by capacitive loads (e.g., ADC input capacitance).
- To reduce 1/f noise contribution: operate at gain ≥ 10 — shifts dominant noise corner lower and improves integrated noise.
đ§ Thermal Management & Reliability:
- TSSOP-16 has moderate thermal capability (θJA ≈ 110°C/W). For continuous operation above +60°C ambient, add ≥ 100 mm² copper pour under the IC and ≥ 10 thermal vias.
- FIT rate = 24 failures per billion hours, validated over 1000 h HTOL — suitable for 15+ year deployments.
đ§ System-Level Integration Tips:
- In multi-channel systems: use one ADA4807-4 to condition all four channels (e.g., ECG leads I, II, III, aVR) — ensures channel-to-channel matching and reduces calibration overhead.
- Pair with low-noise references (e.g., ADR4540) and precision ADCs (e.g., AD7694) to build complete 16-bit analog front-end subsystems — validated reference designs available from ADI.
