AD5934YRSZ-REEL7 - 250kSPS 12-Bit Impedance Converter | ADI
MPN: AD5934YRSZ-REEL7 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $16.5 | $16.50 |
| 10 | $14.85 | $148.50 |
| 100 | $13.2 | $1,320.00 |
| 500 | $11.55 | $5,775.00 |
| 1,000 | $9.9 | $9,900.00 |
AD5934YRSZ-REEL7 Overview
An impedance converter network analyzer is a specialized data acquisition system that performs synchronous sine excitation, current-to-voltage conversion, and discrete Fourier transform (DFT) processing to extract magnitude and phase information from a connected unknown impedance. As a member of the impedance analyzer / LCR meter IC family, it sits at the intersection of the broader categories of direct digital synthesis (DDS), signal chain analog-to-digital converter (ADC), and embedded DSP, which together form a complete vector impedance measurement sub-system. The AD5934 in particular integrates DDS, transimpedance amplifier, ADC, and DFT engine into one IC.
Key specifications include 12-bit ADC resolution, 250 kSPS sampling rate, programmable excitation output frequency up to 50 kHz, 16.776 MHz internal clock or external MCLK input, on-chip temperature sensor with ±2 °C precision, and serial interface compatibility with I²C or SPI protocols. The device supports a system clock from 0.1 MHz to 16.776 MHz and is supplied from a single 2.7 V to 5.5 V rail, equivalent to most 3 V or 5 V logic rails. The internal DDS allows 0.1 Hz frequency resolution when clocked from the on-chip oscillator. The excitation amplitude is programmable in four discrete steps between 0.2 Vpp and 1.98 Vpp to accommodate different impedance ranges.
The AD5934 architecture combines a 28-bit direct digital synthesizer (DDS) core, a low-noise transimpedance front-end, a 12-bit successive-approximation ADC, and an embedded DFT processor that returns calibrated real (R) and imaginary (I) 16-bit words per frequency point. Gain factor calibration using a reference impedance removes system gain error across the 100 Ω to 10 MΩ measurement range, equivalent to a four-decade dynamic span, while the embedded temperature sensor compensates for system drift across the -40 °C to +125 °C automotive-grade operating range. The serial interface supports both standard I²C (100 kHz) and SPI (up to 5 MHz) for flexible host connectivity.
Typical applications include portable bio-electrical impedance analysis (BIA) for body composition scales and fitness monitors, in-vitro electrochemical biosensors for glucose and pathogen detection, industrial material moisture and soil moisture analysis, fuel cell and battery impedance spectroscopy for state-of-charge estimation, and on-board diagnostic (OBD) systems for automotive sensor health monitoring. Compared to discrete lock-in amplifier solutions, the AD5934 reduces board area, BOM count, and firmware complexity by integrating the entire excitation-acquisition-DFT pipeline into one SSOP-16 package, while preserving calibration-grade accuracy through its gain factor compensation routine.
When designing with the AD5934, place a precision 200 Ω or 100 kΩ reference resistor between the excitation output (IOUT) and the ADC input (VIN) for system calibration, and use the temperature sensor reading to correct for thermal drift of the reference resistor. The RFB pin selects the transimpedance gain; pair it with a low-temperature-coefficient external feedback resistor to extend the impedance measurement range beyond 1 MΩ.
This page synthesizes distributor pricing, drop-in alternatives, application notes, and design tips that complement the manufacturer datasheet with practical engineering guidance for impedance measurement system development.
Drop-in alternatives for AD5934YRSZ-REEL7 — 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 AD5934YRSZ-REEL7 (same form factor and footprint) — differing in ADC Resolution, Function, Impedance Measurement Range, Package, System Clock (MCLK).
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AD5933YRSZ-REEL7
✅ Drop-In📋 Reference alternative (not in catalog)
AD5934YRSZ
✅ Drop-In✓ In Stock
$3.74 / Unit
View Datasheet →AD5934YRSZ-REEL
✅ Drop-In📋 Reference alternative (not in catalog)
AD5934YRSZ-REEL7 Maximum Ratings & Electrical Characteristics
| Manufacturer | Analog Devices |
| Part Number | AD5934YRSZ-REEL7 |
| Function | 12-bit, 250 kSPS Impedance Converter / Network Analyzer |
| ADC Resolution | 12-bit |
| Sampling Rate | 250 kSPS |
| Excitation Frequency Range | Up to 50 kHz |
| System Clock (MCLK) | Up to 16.776 MHz (external or internal) |
| Frequency Resolution | 0.1 Hz (with 27-bit accumulator) |
| Supply Voltage | 2.7 V to 5.5 V |
| Excitation Amplitude | 0.2 Vpp to 1.98 Vpp (programmable, 4 steps) |
| Impedance Measurement Range | 100 Ω to 10 MΩ (with calibration) |
| Serial Interface | I²C (100 kHz) / SPI (up to 5 MHz) |
| Operating Temperature Range | -40 °C to +125 °C |
| Package | 16-pin SSOP (YRS) |
| Mounting Type | Surface Mount |
| MSL Level | 1 (per JEDEC J-STD-020) |
| RoHS Status | Compliant |
| Reel Quantity | 1000 (REEL7) |
AD5934YRSZ-REEL7 Pin Configuration
| Pin 1 | MCLK — Master Clock input (external) or output (internal crystal) |
| Pin 2 | SDA/SDI — Serial Data I/O (I²C) or Serial Data In (SPI) |
| Pin 3 | SCL/SCLK — Serial Clock (I²C) or SPI Clock |
| Pin 4 | CS — Chip Select (SPI active low) |
| Pin 5 | RFB — External feedback resistor for transimpedance amplifier |
| Pin 6 | VIN — ADC analog input (current-to-voltage output) |
| Pin 7 | AVDD — Analog supply voltage (2.7 V to 5.5 V) |
| Pin 8 | AGND — Analog ground |
| Pin 9 | DGND — Digital ground |
| Pin 10 | DVDD — Digital supply voltage (internal LDO output) |
| Pin 11 | IOUT — Excitation current/voltage output to unknown impedance |
| Pin 12 | NC — Not connected (per datasheet) |
| Pin 13 | NC — Not connected (per datasheet) |
| Pin 14 | NC — Not connected (per datasheet) |
| Pin 15 | NC — Not connected (per datasheet) |
| Pin 16 | NC — Not connected (per datasheet) |
Typical Applications
AD5934YRSZ-REEL7 is suitable for 6 applications: Bio-Electrical Impedance Analysis (BIA) Body Composition Scale, Electrochemical Impedance Spectroscopy (EIS) Biosensor, Battery Impedance Spectroscopy and State-of-Health Monitoring, Soil Moisture and Material Composition Analysis, Automotive Sensor Health and OBD Diagnostics, LCR Meter and Handheld Test Equipment.
Bio-Electrical Impedance Analysis (BIA) Body Composition Scale
The AD5934YRSZ-REEL7 is well-suited for handheld bio-electrical impedance analysis (BIA) body composition scales due to its integrated DDS, 12-bit ADC, 50 kHz excitation capability, and low-power I²C interface. In a typical tetrapolar four-electrode configuration, the device injects a 200 µA peak AC current at 50 kHz and measures the resulting voltage drop across the body to derive impedance magnitude and phase, from which body fat percentage, lean mass, and hydration are calculated. The on-chip temperature sensor compensates for skin-electrode contact impedance drift, and the integrated DFT engine eliminates external DSP processing, reducing BOM cost by 30-40% compared to discrete lock-in amplifier designs.
Recommended
Electrochemical Impedance Spectroscopy (EIS) Biosensor
The AD5934YRSZ-REEL7 enables low-cost portable electrochemical impedance spectroscopy (EIS) biosensors for glucose, pathogen, and DNA detection. Its 50 kHz excitation range covers the typical 1 Hz to 100 kHz sweep range needed for impedance-based affinity biosensors, and the 12-bit ADC provides sufficient resolution for detecting sub-ohm impedance changes from binding events. The programmable excitation amplitude (0.2 Vpp to 1.98 Vpp) allows tailoring of the AC signal to the electrochemical cell's bias requirements, while the integrated gain factor calibration using an on-board reference resistor ensures measurement accuracy within 1-2% across the 100 Ω to 1 MΩ impedance range typical of biosensors.
Recommended
Battery Impedance Spectroscopy and State-of-Health Monitoring
The AD5934YRSZ-REEL7 supports in-situ battery impedance spectroscopy for state-of-health (SOH) and state-of-charge (SOC) estimation in Li-ion, lead-acid, and supercapacitor systems. By sweeping the excitation frequency from 1 Hz to 50 kHz and measuring the complex impedance at each frequency point, the device captures the battery's charge-transfer and Warburg impedance characteristics, enabling accurate capacity fade prediction and internal short detection. The integrated 12-bit ADC eliminates the need for external analog front-end ICs, and the -40 °C to +125 °C operating range covers automotive battery management underhood environments. The I²C interface enables direct connection to battery management MCUs without level shifters.
Recommended
Soil Moisture and Material Composition Analysis
The AD5934YRSZ-REEL7 is widely deployed in industrial soil moisture sensors, grain moisture meters, and concrete curing analyzers due to its 100 Ω to 10 MΩ impedance range and 0.1 Hz frequency resolution. Agricultural precision irrigation systems use the device to measure soil dielectric properties at 10 kHz to 50 kHz excitation, deriving volumetric water content (VWC) and salinity. The integrated temperature sensor corrects for thermal variation in soil dielectric constant, while the SSOP-16 package enables compact, battery-powered handheld probe designs. Compared to capacitive-only solutions, impedance-based soil sensors are unaffected by soil type and provide accurate readings across sandy, clay, and peat substrates.
Recommended
Automotive Sensor Health and OBD Diagnostics
The AD5934YRSZ-REEL7 is used in automotive on-board diagnostic (OBD) systems to monitor the impedance of oxygen sensors, knock sensors, and tire pressure sensors for health and aging estimation. The -40 °C to +125 °C automotive temperature range and SSOP-16 surface-mount form factor make it suitable for underhood ECU integration. By injecting a small AC excitation signal at 1 kHz to 10 kHz and measuring the resulting impedance, the device can detect sensor drift, contamination, and wire harness degradation, enabling predictive maintenance. The SPI interface supports high-speed data transfer to automotive MCUs over CAN-bus transceivers.
Recommended
LCR Meter and Handheld Test Equipment
The AD5934YRSZ-REEL7 is well-suited for low-cost handheld LCR meters used in electronics manufacturing test, field service, and education applications. Its integrated DDS + ADC + DFT architecture eliminates the need for bulky benchtop impedance analyzers in portable form factors, while still delivering 1-2% measurement accuracy after calibration. Combined with a touchscreen host MCU and a four-wire Kelvin test fixture, the device can measure inductance, capacitance, and resistance from 100 Ω to 10 MΩ at 100 Hz to 50 kHz test frequencies. The I²C interface simplifies connection to low-cost Cortex-M0 host MCUs, and the small SSOP-16 package enables compact handheld probe designs.
Recommended
Recommended Products Summary
Engineering reference data for AD5934YRSZ-REEL7 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AD5933YRSZ-REEL7 | AD5934YRSZ | AD5934YRSZ-REEL |
|---|---|---|---|---|
| Package | 16-pin SSOP (YRS) | 16-pin SSOP - same | 16-pin SSOP - same | 16-pin SSOP - same |
| Brand | Analog Devices | Analog Devices - same | Analog Devices - same | Analog Devices - same |
| ADC Sampling Rate | 250 kSPS | 1 MSPS (4x faster) | 250 kSPS - same | 250 kSPS - same |
| ADC Resolution | 12-bit | 12-bit - same | 12-bit - same | 12-bit - same |
| Max Excitation Frequency | 50 kHz | 100 kHz | 50 kHz - same | 50 kHz - same |
| MCLK Range | Up to 16.776 MHz | Up to 16.776 MHz - same | Up to 16.776 MHz - same | Up to 16.776 MHz - same |
| Supply Voltage | 2.7 V to 5.5 V | 2.7 V to 5.5 V - same | 2.7 V to 5.5 V - same | 2.7 V to 5.5 V - same |
| Serial Interface | I²C / SPI | I²C / SPI - same | I²C / SPI - same | I²C / SPI - same |
| Packaging | Tape & Reel (1000) | Tape & Reel (1000) | Tube | Tape & Reel (10000) |
Key Differentiators
- Higher frequency resolution (0.1 Hz) than AD5933 (vs AD5933YRSZ-REEL7)
- Lower power consumption than AD5933 at idle (vs AD5933YRSZ-REEL7)
- Integrated temperature sensor eliminates external sensor (vs AD5933YRSZ-REEL7)
Design Notes
The AD5934YRSZ-REEL7 requires a system calibration using a known reference impedance to achieve specified accuracy. Place a precision reference resistor (typically 200 Ω for low-impedance ranges, 100 kΩ for high-impedance ranges, ±0.1% tolerance, low TC) between IOUT and VIN pins. Sweep this reference across all target measurement frequencies and store the gain factor and system phase offset in non-volatile memory on the host MCU. The calibration should be performed at production and periodically in field use, especially for battery impedance applications where reference aging affects accuracy.
Route the IOUT and VIN traces as a differential pair on the PCB to minimize stray capacitance and EMI pickup. Place the external feedback resistor on the RFB pin within 5 mm of the IC with a ground guard ring around it. Decouple AVDD with a 10 µF tantalum in parallel with a 0.1 µF ceramic, placed within 3 mm of the AVDD pin. Separate analog ground (AGND) and digital ground (DGND) at the IC, joining at a single point near the power supply input to avoid digital switching noise coupling into the analog frontend.
Common pitfalls with the AD5934YRSZ-REEL7 include: (1) forgetting to issue the start frequency, frequency increment, and number of increments commands in the correct sequence; (2) not waiting the settling time (typically 1-2 ms) between frequency steps; (3) using an incorrect feedback resistor value for the target impedance range, causing ADC saturation; (4) ignoring the temperature sensor reading and its effect on reference impedance drift; and (5) applying excitation outside the 0.2 Vpp to 1.98 Vpp range which distorts the impedance measurement. Read the calibration register return codes to verify each setup step completed correctly before reading the DFT result registers.
The excitation signal integrity directly impacts measurement accuracy. Use a low-capacitance probe connection to the unknown impedance under test; even 5 pF of stray capacitance causes measurable phase error above 10 kHz. For four-wire (tetrapolar) measurements, drive the outer electrodes with the DDS output through a 1 kΩ series resistor to limit current, and sense the inner electrodes with a high-impedance instrumentation amplifier (e.g., AD8221) before routing to the AD5934 VIN pin. This arrangement eliminates electrode contact impedance from the measurement, critical for accurate bio-impedance and electrochemical sensor readings.
Compliance Information
RoHS and REACH compliant per Analog Devices product page. Not AEC-Q100 qualified; for automotive applications use the AD5940 (AEC-Q100 Grade 1).
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