AD633JNZ is a precision, laser-trimmed, four-quadrant analog multiplier/divider IC designed and manufactured by Analog Devices Inc. (ADI). It belongs to the classic, high-accuracy AD633 family, engineered specifically for true analog computation applications, where real-time multiplication, division, squaring, square-rooting, and modulation/demodulation of low-frequency signals — with exceptional linearity, stability, and DC precision — are required.
The “JNZ” suffix denotes the 8-lead PDIP package (0.3 inch width) — a through-hole, breadboard-friendly, and historically widely used package; it is Pb-free, RoHS-compliant, and qualified for commercial temperature range (0°C to +70°C ambient). (Note: For industrial or extended temperature operation, ADI offers the AD633ARZ in SOIC-8.)
⚠️ Critical Clarification:
The AD633 is not a digital signal processor or microcontroller-based multiplier. It is a fully analog, monolithic, four-quadrant voltage-mode multiplier, meaning:
- It multiplies two differential input voltages (X₁–X₂ and Y₁–Y₂) and adds a Z input offset, producing an output:
VOUT = (X₁ – X₂)(Y₁ – Y₂)/10 V + Z
— the /10 V scaling factor provides inherent gain control and simplifies interfacing (e.g., ±10 V inputs → ±10 V output full scale);
- It operates DC-coupled, with guaranteed performance from DC to 1 MHz, making it suitable for both static (e.g., sensor linearization) and dynamic (e.g., AM demodulation) applications;
- It features laser-trimmed thin-film resistors, delivering 0.5% maximum total error (including linearity, gain, and offset) over temperature — far superior to discrete op-amp+transistor multipliers;
- It requires no external components for basic operation, but supports optional external compensation (for bandwidth extension) and external reference (for improved accuracy).
It operates from ±8 V to ±18 V dual supplies, consumes 12 mA quiescent current, and delivers ±10 V output swing into 2 kΩ loads. Its PDIP-8 (JNZ) package is ideal for prototyping, calibration equipment, and legacy industrial systems requiring field-replaceable through-hole components.
Introduction
The AD633JNZ delivers laboratory-grade analog computation in a classic DIP-8 footprint:
🔹 True four-quadrant operation: Accepts positive and negative inputs simultaneously — enabling full mathematical flexibility (e.g., signed arithmetic, phase-sensitive detection, vector magnitude calculation);
🔹 High DC accuracy & stability: 0.5% max total error, 0.1% max linearity error, 50 µV/°C max input offset drift, and 10 ppm/°C max scale factor drift — enables use in precision instrumentation without periodic recalibration;
🔹 Wide dynamic range: Input range ±10 V, output range ±10 V, bandwidth 1 MHz (−3 dB), slew rate 20 V/µs — suitable for audio, ultrasonic, and control system applications;
🔹 Built-in summing node (Z input): Allows addition of offset, bias, or feedback signals — essential for closed-loop configurations (e.g., automatic gain control, RMS-to-DC conversion).
Its PDIP-8 (JNZ) package (0.3 inch) offers excellent manufacturability for through-hole assembly and unmatched ease-of-use on test benches and educational platforms. With only two external decoupling capacitors required, it replaces complex discrete multiplier circuits while improving reliability and reducing board space.
Key Features
✅ Precision Four-Quadrant Multiplication:
• Transfer function: VOUT = (X₁–X₂)(Y₁–Y₂)/10 V + Z;
• Input range: ±10 V (differential);
• Output range: ±10 V (into ≥ 2 kΩ load);
• Total error: ≤ 0.5% (max) over temperature and line/load.
✅ High DC & AC Performance:
• Linearity error: ≤ 0.1% (max);
• Input offset voltage: ≤ 5 mV (max), drift: 50 µV/°C (max);
• Scale factor (gain) error: ≤ 0.2% (max), drift: 10 ppm/°C (max);
• Bandwidth: 1 MHz (−3 dB), slew rate: 20 V/µs.
✅ Flexible Configuration & Integration:
• Z-input: summing node for offset, bias, or feedback injection;
• Optional external compensation: add capacitor between pins 5–6 to extend bandwidth or reduce peaking;
• Optional external reference: replace internal 10 V reference with precision external source (e.g., ADR4540) for <0.05% gain error;
• No external components required for basic operation.
✅ Robust Operation & Protection:
• Supply voltage: ±8 V to ±18 V (±15 V typical);
• Quiescent current: 12 mA (typ.), 15 mA (max);
• Output short-circuit protection: current-limited to ～25 mA;
• ESD rating: > 2 kV HBM.
✅ PDIP-8 (JNZ) Package & Commercial Qualification:
• 8-Lead Plastic Dual-In-Line Package (0.3 inch);
• RoHS-compliant, Pb-free;
• Operating ambient temperature: 0°C to +70°C.
Typical Specification Table
| Parameter |
Specification |
| Manufacturer |
Analog Devices Inc. (ADI) |
| Product Series |
AD633 Family (Precision Analog Multipliers) |
| Model |
AD633JNZ |
| Function |
Four-Quadrant Analog Multiplier/Divider |
| Transfer Function |
VOUT = (X₁–X₂)(Y₁–Y₂)/10 V + Z |
| Input Voltage Range |
±10 V (differential) |
| Output Voltage Range |
±10 V (into ≥ 2 kΩ) |
| Total Error (max) |
0.5% (linearity + gain + offset, over temp) |
| Linearity Error (max) |
0.1% |
| Input Offset Voltage (max) |
5 mV, 50 µV/°C drift |
| Scale Factor Drift (max) |
10 ppm/°C |
| Bandwidth (−3 dB) |
1 MHz |
| Slew Rate |
20 V/µs |
| Supply Voltage |
±8 V to ±18 V (dual) |
| Quiescent Current |
12 mA (typ.), 15 mA (max) |
| Operating Ambient Temp. |
0°C to +70°C |
| Package |
8-Lead PDIP (0.3 inch) (JNZ) |
| RoHS / Green |
Yes (Pb-free) |
Typical Applications
🔹 Precision Instrumentation: Sensor linearization (e.g., thermocouple, RTD, strain gauge), analog computing modules in lab equipment, and calibration standards — leveraging 0.5% total error and low drift.
🔹 Communication Systems: Amplitude modulation (AM) and demodulation, synchronous (phase-sensitive) detection, and automatic gain control (AGC) loops — enabled by true four-quadrant operation and wide bandwidth.
🔹 Control & Signal Processing: RMS-to-DC conversion (using external op-amps in feedback), vector magnitude computation (|V| = √(X² + Y²)), and PID controller multipliers — using Z-input for feedback summation.
🔹 Audio & Ultrasonic Processing: Analog effects (e.g., ring modulation, tremolo), ultrasonic time-of-flight measurement, and acoustic beamforming — benefiting from 1 MHz bandwidth and low distortion.
🔹 Educational & Prototyping Platforms: Analog computing labs, university electronics courses, and breadboard-based signal generators — thanks to PDIP-8’s ease of use and robustness.
🔹 Legacy Industrial Equipment: Replacement for aging discrete multipliers in PLC analog modules, power metering front-ends, and motor control feedback circuits.
Development & Design Notes
🔧 Power Supply Decoupling:
- Place 10 µF tantalum + 100 nF ceramic capacitors within 1 cm of each supply pin (±VS) and ground — suppresses supply ripple and improves PSRR.
- Add a 10 nF ceramic capacitor directly between +VS and –VS (close to IC) — reduces high-frequency noise coupling.
🔧 PCB Layout Best Practices:
- Keep X and Y input traces short and symmetric — minimize parasitic capacitance that degrades high-frequency accuracy.
- Use ground guard rings around sensitive inputs (X₁/X₂/Y₁/Y₂) — reduces leakage and capacitive coupling.
- Avoid routing high-current digital traces near the AD633 — its analog nature makes it susceptible to crosstalk.
🔧 Stability & Compensation:
- The AD633 is internally compensated for unity-gain stability — no external cap needed for standard use.
- To extend bandwidth beyond 1 MHz: add a small capacitor (e.g., 10–100 pF) between pins 5 (compensation) and 6 (bias) — consult datasheet Figure 27 for trade-offs.
- For best DC accuracy, use external precision reference (e.g., ADR4540) at pin 6 instead of internal 10 V ref — reduces gain error from 0.2% to <0.05%.
🔧 Thermal Management & Drift Optimization:
- Mount away from heat sources (e.g., power regulators) — its 50 µV/°C offset drift means 10°C rise = 500 µV error.
- For metrology-grade applications, operate at ±15 V supplies — improves PSRR and reduces sensitivity to supply variations.
🔧 Reliability & Calibration Strategy:
- FIT rate = 18 failures per billion hours, with long-term stability validated per MIL-STD-883 — suitable for 10+ year deployments.
- For ISO/IEC 17025 compliance: perform annual external calibration using a metrology-grade calibrator (e.g., Fluke 5520A) — ADI provides NIST-traceable calibration certificates.
