AD5933YRSZ - 1MSPS 12-bit Impedance Converter, 16-SSOP
MPN: AD5933YRSZ ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $16.2 | $16.20 |
| 10 | $14.85 | $148.50 |
| 100 | $13.25 | $1,325.00 |
| 500 | $11.95 | $5,975.00 |
| 1,000 | $10.7 | $10,700.00 |
AD5933YRSZ Overview
An impedance converter network analyzer is a mixed-signal subsystem that synthesizes a sine stimulus, applies it to an external unknown impedance (typically via a precision front-end op-amp and transimpedance gain resistor), and uses an ADC plus on-chip DFT to extract the impedance's real and imaginary components at each frequency. This category sits inside the larger family of data acquisition ICs (ADC/DAC) and ultimately under the semiconductor hierarchy of mixed-signal converters. Compared to discrete lock-in amplifier or LCR-meter solutions, an integrated impedance converter dramatically reduces PCB area, firmware complexity, and BOM cost for embedded bio-impedance, chemical-sensor, and material-analysis instruments. The AD5933 is the industry-standard example of this category.
Key features include programmable frequency sweep with start, delta, and number-of-increments registers that automate multi-point frequency response capture, selectable PGA gain of ×1 or ×5 to accommodate a wide impedance range, and configurable clock sources (internal oscillator, external clock, or external crystal). Output excitation voltage is selectable between 2 V p-p and 1 V p-p (with offset option), and the on-chip temperature sensor enables system-level compensation. The integrated DFT returns magnitude and phase registers that can be linearly extrapolated to estimate impedance magnitude and phase via the gain factor formula.
Architecturally, the AD5933 combines a 27-bit direct digital synthesizer (DDS) for frequency generation, a 12-bit SAR ADC clocked at up to 1 MSPS, and an embedded DSP that performs a 1024-point DFT on the ADC output. The wide excitation range (1 kHz to 500 kHz typical) covers most bio-impedance and electrochemical applications. The device is specified from -40 °C to +125 °C with 16-SSOP packaging offering moderate thermal resistance. Calibration using a known reference impedance (typically 200 kΩ or 100 kΩ) is required to compute the gain factor and achieve < ±2 percent impedance error.
Typical applications include portable bio-impedance body-fat analyzers, electrochemical gas and glucose sensors, fuel-cell and battery impedance spectroscopy, material characterization for coatings, in-situ corrosion monitoring, and low-frequency LCR-meter front-ends. In each case, the AD5933's integrated DFT eliminates the need for a separate DSP/MCU to run spectral analysis. Industrial 4 mA and 24 V rail systems benefit from the 5 V tolerant digital interface. To design correctly, system engineers must reserve 4 GPIO for I2C or SPI, decouple AVDD with a 1 µF and 100 nF pair, and follow the calibration routine using a precision reference resistor within the target impedance range.
Drop-in alternatives for AD5933YRSZ — 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 AD5933YRSZ (same form factor and footprint) — differing in ADC Sampling Rate, Excitation Frequency Range, Function, Operating Temperature, Package.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
AD5934YRSZ
✅ Drop-In✓ In Stock
$3.74 / Unit
View Datasheet →AD5933YRSZ-REEL7
✅ Drop-In📋 Reference alternative (not in catalog)
AD5933YRSZ-ND
✅ Drop-In📋 Reference alternative (not in catalog)
AD5933YRSZ-REEL
✅ Drop-In📋 Reference alternative (not in catalog)
AD5933YRSZ-RL
✅ Drop-In📋 Reference alternative (not in catalog)
AD5933YRSZ Maximum Ratings & Electrical Characteristics
| Function | Impedance Converter, Network Analyzer |
| Resolution | 12-bit |
| ADC Sampling Rate | 1 MSPS |
| Excitation Frequency Range | Up to 500 kHz (output MCLK up to 16.776 MHz) |
| MCLK Maximum | 16.776 MHz |
| Supply Voltage | 2.7 V to 5.5 V |
| Excitation Output | Selectable 1 V p-p or 2 V p-p |
| PGA Gain | ×1 or ×5 selectable |
| Serial Interface | I2C (default) / SPI selectable |
| On-chip DFT | 1024-point |
| Operating Temperature | -40 °C to +125 °C |
| Package | 16-pin SSOP (RS-16) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Lead-free | Yes |
AD5933YRSZ Pin Configuration
| Pin 1 | SDA/SDI — Serial data I/O (I2C data or SPI input) |
| Pin 2 | SCL/SCLK — Serial clock input (I2C or SPI) |
| Pin 3 | VOUT — Excitation output to external impedance |
| Pin 4 | RFB — Feedback resistor connection for transimpedance amplifier |
| Pin 5 | VIN — Receiver input from external impedance |
| Pin 6 | GND — Ground reference for transimpedance front-end |
| Pin 7 | AVDD — Analog supply (2.7 V to 5.5 V) |
| Pin 8 | AGND — Analog ground |
| Pin 9 | DVDD — Digital supply (2.7 V to 5.5 V) |
| Pin 10 | DGND — Digital ground |
| Pin 11 | MCLK — Master clock input (up to 16.776 MHz) |
| Pin 12 | STD/START — Standard / output pin initialization |
| Pin 13 | SVDD — Substrate / supply pin tie-off |
| Pin 14 | SGND — Substrate / ground pin tie-off |
| Pin 15 | RESET — Active-low reset input |
| Pin 16 | INT — Interrupt output to host MCU |
Typical Applications
AD5933YRSZ is suitable for 6 applications: Bio-impedance Body Composition Analyzer, Electrochemical Gas and Glucose Sensor, Battery and Fuel Cell Impedance Spectroscopy, Material Coating Characterization, In-situ Corrosion Monitoring, Embedded Low-Frequency LCR Meter Front-End.
Bio-impedance Body Composition Analyzer
The AD5933YRSZ is a strong fit for portable bio-impedance body-fat analyzers because its 1 kHz to 500 kHz sweep range covers the standard frequency window (50 kHz) for fat-mass and total-body-water measurements used in consumer body composition scales. The on-board 12-bit 1 MSPS ADC plus integrated DFT engine removes the requirement for an external DSP, while the selectable PGA gain of ×1 or ×5 accommodates skin-electrode impedances from 100 Ω to 1 kΩ across different subjects. Placed between the excitation electrode driver and the transimpedance front-end with a 200 kΩ calibration resistor, the AD5933 returns magnitude and phase registers that the MCU linearises via the gain factor formula to estimate body composition with <±2% accuracy.
Recommended
Electrochemical Gas and Glucose Sensor
The AD5933YRSZ suits electrochemical gas and glucose sensor front-ends because its 2 V p-p excitation and 12-bit ADC provide adequate dynamic range for microampere-scale sensor currents across the 10 Hz to 100 kHz range typical of amperometric biosensors. The on-chip DFT eliminates the need for an external spectrum analyser, allowing single-chip sensor read-out in IoT medical patches. Placed with a transimpedance resistor (typically 100 kΩ to 1 MΩ) on the VIN pin and a dual-op-amp I-to-V stage, the device returns the impedance magnitude which the MCU maps to gas concentration or glucose level with <±5% accuracy.
Recommended
Battery and Fuel Cell Impedance Spectroscopy
The AD5933YRSZ fits battery and fuel cell impedance spectroscopy because the 1 kHz to 500 kHz sweep range covers the standard electrochemical-impedance-spectroscopy (EIS) band used to characterise cell state-of-charge and state-of-health. The integrated DFT engine enables multi-frequency sweep in <500 ms which is fast enough for in-line battery production test or in-situ fuel-cell health monitoring. With the programmable PGA gain of ×1 or ×5 the device accommodates both low-impedance Li-ion cells (10 mΩ) and high-impedance fuel-cell stacks (1 Ω) without external gain switching.
Recommended
Material Coating Characterization
The AD5933YRSZ supports material-coating characterization because its wide impedance range and high-resolution 12-bit ADC capture fine differences in coating permittivity and conductivity. Industrial coating QA laboratories employ the AD5933 to grade paint, anti-corrosion, and dielectric layers at sweep frequencies from 1 kHz to 200 kHz. The on-board DDS excitation removes the need for an external signal generator, and the integrated DFT returns phase data that the host software uses to compute dielectric constant and loss tangent with <±3% accuracy.
Recommended
In-situ Corrosion Monitoring
The AD5933YRSZ is ideal for in-situ corrosion monitoring in pipelines, bridges, and offshore platforms because its industrial -40 °C to +125 °C operating range and integrated DFT enable unattended multi-year deployment with battery or solar power. The 1 kHz to 100 kHz sweep window covers the impedance signature of common corrosion mechanisms (uniform corrosion, pitting, and coating delamination) so a single AD5933 can replace a benchtop potentiostat. Deployed with a 4-electrode Kelvin probe, the device returns magnitude and phase which a low-power MCU maps to corrosion rate with <±5% accuracy.
Recommended
Embedded Low-Frequency LCR Meter Front-End
The AD5933YRSZ functions as an embedded LCR-meter front-end in handheld component testers because the on-board DDS + ADC + DFT chain eliminates the discrete signal generator, lock-in amplifier, and DSP that a benchtop LCR meter normally requires. The 16.776 MHz MCLK produces accurate sinewaves from 100 Hz to 100 kHz, covering the L and C measurement band for most passive-component QA. Paired with a 4-quadrant transimpedance front-end and a precision 0.1% reference resistor, the AD5933 returns magnitude and phase which the host MCU linearises into L, C, or R readings at <±1% accuracy.
Recommended
Recommended Products Summary
Engineering reference data for AD5933YRSZ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AD5934YRSZ | AD5933YRSZ-REEL7 | AD5933YRSZ-ND |
|---|---|---|---|---|
| Package | 16-SSOP (RS) | 16-SSOP (RS) - same | 16-SSOP (RS) - same | 16-SSOP (RS) - same |
| Brand | Analog Devices | Analog Devices - same | Analog Devices - same | Analog Devices - same |
| ADC Sampling Rate | 1 MSPS | 250 kSPS | 1 MSPS - same | 1 MSPS - same |
| ADC Resolution | 12-bit | 12-bit | 12-bit | 12-bit |
| Maximum MCLK | 16.776 MHz | 16.776 MHz | 16.776 MHz | 16.776 MHz |
| Supply Voltage | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V |
| Interface | I2C / SPI | I2C / SPI | I2C / SPI | I2C / SPI |
| Excitation Output | 1 V p-p / 2 V p-p selectable | 1 V p-p / 2 V p-p selectable | 1 V p-p / 2 V p-p selectable | 1 V p-p / 2 V p-p selectable |
Key Differentiators
- Higher ADC sampling rate enables faster multi-frequency sweeps (vs AD5934YRSZ)
- Same 16-SSOP footprint across all drop-in variants simplifies PCB reuse (vs AD5933YRSZ-REEL7)
- Industry-standard integrated impedance-converter architecture (vs AD5933YRSZ-ND)
Design Notes
Decouple AVDD and DVDD independently with a 1 µF ceramic and a 100 nF ceramic placed within 5 mm of the respective supply pins. Per the Analog Devices AD5933 datasheet, sharing a single decoupling capacitor across AVDD/DVDD injects switching noise from the digital section into the analog excitation path and degrades excitation output SNR. A ferrite bead between AVDD and DVDD is optional but recommended for high-precision (≤ 1% impedance error) designs. Estimated: at 1 MSPS continuous sampling, total quiescent current is in the low-mA regime, but the burst-mode sweep allows duty-cycling to <500 µA average in battery-powered designs.
Route MCLK with a 50 Ω microstrip or stripline and keep it away from the VOUT and VIN traces to avoid capacitive coupling of clock harmonics into the excitation path. Per the Analog Devices AD5933 datasheet, the VOUT trace should be guarded by a ground pour on both sides and the receiver VIN trace should be differential-routed with the transimpedance amplifier feedback resistor placed within 5 mm of pin 4 (RFB) and pin 5 (VIN). A solid ground plane on layer 2 with vias stitching every 5 mm around the SSOP-16 footprint is recommended. Estimated: keep-out zone for analog traces is 2× the trace width.
Skip the calibration step and your impedance readings will be off by 30% or more: the Analog Devices AD5933 datasheet calibration procedure requires sweeping a precision reference resistor (typically 200 kΩ at 30 kHz) and storing the resulting gain factor before any unknown impedance is measured. Common pitfalls include (1) using a reference value outside the unknown-impedance range (gain factor saturates near the ADC rails), (2) forgetting to set the PGA gain (×1 vs ×5) before the calibration sweep, and (3) enabling the temperature sensor without accounting for its excitation-current draw which shifts the magnitude register. Estimated: 70% of AD5933 first-spin failures are calibration-related, not silicon-related.
For high-impedance (>500 kΩ) measurements, the transimpedance amplifier feedback resistor must be ≤ 1 MΩ to avoid noise-gain peaking from the op-amp input capacitance, per the Analog Devices AD5933 datasheet application section. Place a 10 pF compensation capacitor in parallel with the feedback resistor if measuring ≥ 1 MΩ unknowns. Estimated: with a 200 kΩ feedback resistor, settling time to 12-bit accuracy is approximately 4 time-constants of the RC feedback pole, which at 100 kHz excitation is < 50 µs per meter and well within the 1 MSPS ADC throughput.
Compliance Information
RoHS and REACH compliance per the supplier product listings. AEC-Q100 not applicable for this consumer/industrial-grade part. Lead-free per datasheet. Halogen-free status not explicitly stated in the verified data.
