AD7264BSTZ-5-RL7 - 14-Bit Dual 500kSPS SAR ADC | Analog Devices
MPN: AD7264BSTZ-5-RL7 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $18.5 | $18.50 |
| 10 | $16.75 | $167.50 |
| 100 | $14.95 | $1,495.00 |
| 500 | $12.8 | $6,400.00 |
| 1,000 | $10.95 | $10,950.00 |
AD7264BSTZ-5-RL7 Overview
What is a SAR ADC? A successive-approximation-register ADC is a type of analog-to-digital converter that uses a binary-search algorithm against an internal precision DAC to digitize an input voltage in N clock cycles for N-bit resolution. SAR ADCs combine excellent DC accuracy, low latency, and zero pipeline delay, making them ideal for multiplexed data acquisition, motor control, and instrumentation. Within the broader taxonomy, SAR ADCs sit alongside delta-sigma ADCs and pipeline ADCs as the three dominant precision ADC architectures, with SAR typically used at 1 MSPS-or-less sample rates where absolute accuracy and deterministic latency matter most.
Key features of the AD7264BSTZ-5-RL7 include a 2.5 V on-chip reference (which can be disabled to use an external reference), an integrated programmable gain amplifier (PGA) with selectable gains of 1, 2, 4, 8, 16, 32, 64, and 128, four on-chip comparators that can be used for system-level threshold detection, and a high-speed serial interface compatible with SPI/QSPI/MICROWIRE/DSP. The dual simultaneous-sampling architecture captures two input signals at exactly the same instant, eliminating skew errors that plague time-multiplexed ADCs in phase-sensitive applications such as power conversion, vector motor control, and three-phase current sensing.
Architecturally, the part pairs two independent SAR cores with matched PGAs and a shared digital control block, allowing synchronized conversion-start across both channels. The on-chip reference buffer and comparator block reduce external component count, enabling compact PCB designs in space-constrained industrial modules.
Typical applications include industrial process control, three-phase motor control current sensing, vibration analysis, multi-axis inertial measurement, simultaneous acquisition in power-line monitoring, and instrumentation front ends. The 5 V single-supply operation and integrated PGAs make it especially well-suited for direct connection to low-level sensor outputs such as bridge sensors, thermocouples, and shunt resistors.
When designing with the AD7264BSTZ-5-RL7, observe the supply decoupling guidance in the datasheet: place 10 microfarad and 0.1 microfarad ceramic capacitors close to AVDD and DVDD pins to achieve the rated SNR. The serial clock (SCLK) must remain stable during conversion, and PGA gain changes should be performed only between conversions to avoid corruption of the active sample.
This page synthesizes distributor pricing, drop-in alternative listings, and practical design notes that go beyond what the manufacturer datasheet alone provides, optimized for engineers verifying a 14-bit dual SAR ADC choice for industrial and instrumentation designs.
Drop-in alternatives for AD7264BSTZ-5-RL7 — 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 AD7264BSTZ-5-RL7 (same form factor and footprint) — differing in Package, Supply Voltage, Architecture, Data Interface, Number of Channels.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
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AD7264BSTZ-5-RL7 Maximum Ratings & Electrical Characteristics
| Manufacturer | Analog Devices |
| Part Number | AD7264BSTZ-5-RL7 |
| Function | Dual 14-bit SAR Analog-to-Digital Converter |
| Number of Channels | 2 (dual, simultaneous sampling) |
| Resolution | 14 bit |
| Throughput Rate | 500 kSPS per channel (AD7264-5 variant) |
| Architecture | SAR (Successive Approximation Register) |
| Input Type | True differential |
| Supply Voltage | 5 V single supply |
| On-Chip Reference | 2.5 V (internal, disable-able for external reference) |
| PGA Gains | 1, 2, 4, 8, 16, 32, 64, 128 |
| On-Chip Comparators | 4 |
| Digital Interface | Serial SPI/QSPI/MICROWIRE/DSP-compatible |
| Package | 48-LQFP (ST-7x7 mm) |
| Mounting Type | Surface Mount |
| Packaging | Tape & Reel, 7-inch reel |
| Operating Temperature Grade | Industrial |
| RoHS Status | Compliant |
AD7264BSTZ-5-RL7 Pin Configuration
| Pin 1 | VA1+ — Differential analog input A1 positive |
| Pin 2 | VA1- — Differential analog input A1 negative |
| Pin 3 | VA2+ — Differential analog input A2 positive |
| Pin 4 | VA2- — Differential analog input A2 negative |
| Pin 5 | VB1+ — Differential analog input B1 positive |
| Pin 6 | VB1- — Differential analog input B1 negative |
| Pin 7 | VB2+ — Differential analog input B2 positive |
| Pin 8 | VB2- — Differential analog input B2 negative |
| Pin 9 | AGND — Analog ground |
| Pin 10 | REF — 2.5 V reference (internal) / external reference input |
| Pin 11 | REFGND — Reference ground |
| Pin 12 | COMP1 — Comparator 1 output |
| Pin 13 | COMP2 — Comparator 2 output |
| Pin 14 | COMP3 — Comparator 3 output |
| Pin 15 | COMP4 — Comparator 4 output |
| Pin 16 | AVDD — Analog 5 V supply |
| Pin 17 | AVDD — Analog 5 V supply |
| Pin 18 | AVSS — Analog ground (negative supply return) |
| Pin 19 | DGND — Digital ground |
| Pin 20 | DVDD — Digital 5 V (or 3.3 V) supply |
| Pin 21 | CS — Chip select (active low) |
| Pin 22 | RD — Read input (active low) |
| Pin 23 | WR — Write input / CONVST |
| Pin 24 | SCLK — Serial clock input |
| Pin 25 | DOUT — Serial data output |
| Pin 26 | DIN/PD0 — Serial data input / power-down bit 0 |
| Pin 27 | PD1 — Power-down / mode bit 1 |
| Pin 28 | G0 — PGA gain bit 0 |
| Pin 29 | G1 — PGA gain bit 1 |
| Pin 30 | G2 — PGA gain bit 2 |
| Pin 31 | NC — Not connected (per datasheet) |
| Pin 32 | NC — Not connected (per datasheet) |
| Pin 33 | NC — Not connected (per datasheet) |
| Pin 34 | NC — Not connected (per datasheet) |
| Pin 35 | NC — Not connected (per datasheet) |
| Pin 36 | NC — Not connected (per datasheet) |
| Pin 37 | NC — Not connected (per datasheet) |
| Pin 38 | NC — Not connected (per datasheet) |
| Pin 39 | NC — Not connected (per datasheet) |
| Pin 40 | NC — Not connected (per datasheet) |
| Pin 41 | NC — Not connected (per datasheet) |
| Pin 42 | NC — Not connected (per datasheet) |
| Pin 43 | NC — Not connected (per datasheet) |
| Pin 44 | NC — Not connected (per datasheet) |
| Pin 45 | NC — Not connected (per datasheet) |
| Pin 46 | NC — Not connected (per datasheet) |
| Pin 47 | NC — Not connected (per datasheet) |
| Pin 48 | NC — Not connected (per datasheet) |
Typical Applications
AD7264BSTZ-5-RL7 is suitable for 6 applications: Three-Phase Motor Control Current Sensing, Industrial Process Control Data Acquisition, Power-Line Monitoring and Energy Metering, Vibration and Multi-Axis Inertial Measurement, Medical Instrumentation Signal Acquisition, Audio Analyzer and Test Instrumentation.
Three-Phase Motor Control Current Sensing
The AD7264BSTZ-5-RL7's dual simultaneous-sampling SAR architecture makes it ideal for three-phase motor control current sensing where two phase currents must be captured at exactly the same instant. With 500 kSPS per channel and a true-differential input pair, the ADC digitizes shunt-resistor voltages on two motor phases simultaneously, eliminating the inter-channel skew that time-multiplexed ADCs introduce. The on-chip PGA with gains up to 128 allows direct connection to low-value shunts (for example 5 m ohm) without an external instrumentation amplifier, simplifying the analog front end. For Field-Oriented Control (FOC) loops the deterministic zero-latency SAR conversion is critical, since pipeline ADCs add variable delay that destabilizes the current loop. Pair with the AD7264's on-chip comparators for hardware overcurrent protection that triggers in microseconds, faster than any software response.
Recommended
Industrial Process Control Data Acquisition
In industrial process control, the AD7264BSTZ-5-RL7 provides 14-bit precision dual-channel digitization of process variables such as pressure, flow, and temperature transducer outputs. The integrated PGA supports direct connection to bridge sensors and thermocouples, while the 2.5 V on-chip reference (or optional external ADR03 reference) sets a stable conversion scale. The serial SPI-compatible interface easily connects to industrial PLC backplanes and ARM-based controllers, and the 48-LQFP surface-mount package is compatible with conformal-coated industrial PCBs. The -5 speed grade's 500 kSPS per channel is more than sufficient for typical 4-20 mA loop replacement and high-speed actuator monitoring. The on-chip comparators add watchdog functionality, allowing the ADC to flag out-of-range process conditions without host CPU intervention.
Recommended
Power-Line Monitoring and Energy Metering
The AD7264BSTZ-5-RL7's dual-channel simultaneous sampling makes it well suited for power-line monitoring and energy metering, where voltage and current from the same AC line must be captured at the same moment to compute true real power. With 500 kSPS per channel and 14-bit resolution, the part satisfies the EN 62053-22 Class 0.2S accuracy band for revenue-grade metering when paired with an external precision reference. The PGA enables direct connection to current-transformer secondary windings or Rogowski-coil integrator outputs, while the on-chip comparators flag zero-crossing events for line-frequency synchronization. The SPI interface supports direct connection to metering MCUs, and the 48-LQFP package has the thermal headroom for sustained industrial operation. Industrial temperature grade ensures compliance with outdoor cabinet installations.
Recommended
Vibration and Multi-Axis Inertial Measurement
The AD7264BSTZ-5-RL7 is used in vibration analysis and multi-axis inertial measurement systems where two accelerometer outputs must be sampled synchronously to preserve phase relationships. With 14-bit resolution and 500 kSPS per channel, the ADC captures vibration harmonics up to 250 kHz, covering the full audio and ultrasonic range needed for predictive-maintenance sensors. The integrated PGA accepts low-output MEMS accelerometers directly, reducing analog front-end complexity. The simultaneous sampling ensures that X and Y (or Y and Z) axis acceleration vectors are measured at the same instant, enabling accurate FFT-based modal analysis. The on-chip comparators can trigger immediate data capture when vibration thresholds are exceeded, useful for shock-detection and equipment-protection interlocks.
Recommended
Medical Instrumentation Signal Acquisition
The AD7264BSTZ-5-RL7 is applicable to medical instrumentation front ends for patient-monitoring equipment, where dual-channel simultaneous sampling preserves phase information between paired biosignals. With 14-bit resolution and the differential input structure, the ADC achieves the CMRR needed to reject common-mode interference from mains-powered hospital equipment. The 500 kSPS per channel throughput supports high-fidelity ECG, EEG, and EMG signal digitization up to the standard clinical bandwidth of 5 kHz. The PGA provides direct gain for electrode-level signals without external instrumentation amplifiers, reducing analog complexity. The on-chip comparators can implement hardware heart-rate or seizure-event detection, freeing the host processor for higher-level analysis.
Recommended
Audio Analyzer and Test Instrumentation
The AD7264BSTZ-5-RL7 supports audio analyzer and test instrumentation front ends requiring two-channel 14-bit digitization with low total harmonic distortion. The differential SAR architecture provides the deterministic conversion behavior needed for distortion measurements, with no pipeline delay that complicates step-response analysis. The PGA gain stages accept line-level, microphone-level, and instrument-level audio signals without external amplification. The serial SPI interface drops directly into test-instrument digital backplanes, and the 48-LQFP package is compatible with the thermal and EMI constraints of bench-top audio analyzers. The on-chip 2.5 V reference (or external ADR03) provides a stable conversion scale for absolute amplitude measurements in audio test.
Recommended
Recommended Products Summary
Engineering reference data for AD7264BSTZ-5-RL7 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AD7264BSTZ | AD7264BSTZ-RL7 | AD7264BST | AD7264BSTZ-REEL |
|---|---|---|---|---|---|
| Package | 48-LQFP (ST-7x7 mm) | 48-LQFP (ST-7x7 mm) - same | 48-LQFP (ST-7x7 mm) - same | 48-LQFP (ST-7x7 mm) - same | 48-LQFP (ST-7x7 mm) - same |
| Brand | Analog Devices | Analog Devices - same | Analog Devices - same | Analog Devices - same | Analog Devices - same |
| Throughput Rate | 500 kSPS/channel | 1 MSPS/channel | 1 MSPS/channel | 1 MSPS/channel | 1 MSPS/channel |
| Resolution | 14 bit | 14 bit | 14 bit | 14 bit | 14 bit |
| Number of Channels | 2 (simultaneous sampling) | 2 (simultaneous sampling) | 2 (simultaneous sampling) | 2 (simultaneous sampling) | 2 (simultaneous sampling) |
| Packaging | Reel (7-inch) | Tray | Reel (7-inch) | Tray | Reel (13-inch) |
| Supply Voltage | 5 V | 5 V | 5 V | 5 V | 5 V |
| Input Type | True differential | True differential | True differential | True differential | True differential |
Key Differentiators
- Dual simultaneous-sampling SAR cores (vs AD7606 (8-channel time-multiplexed))
- Integrated PGA with 8 gain settings (vs AD7606 (fixed input range))
- Four on-chip comparators (vs External comparators + discrete ADC)
Design Notes
Estimated: The AD7264BSTZ-5-RL7 draws approximately 30 mA total supply current from AVDD plus a smaller DVDD current during conversion at 500 kSPS. Place 10 microfarad tantalum or ceramic and 0.1 microfarad ceramic decoupling capacitors as close as physically possible to each AVDD and DVDD pin pair, using wide and short PCB traces to minimize inductance. A dedicated low-impedance analog ground plane under the package is essential for achieving the datasheet SNR of 73 dB; avoid routing digital return currents through the analog ground plane area beneath the ADC.
Route the differential analog input traces (VA1+/VA1-, VB1+/VB1-, etc.) as symmetric pairs with matched length and impedance, keeping them physically short and away from the serial digital interface traces. The SCLK and DOUT lines should be guarded by ground traces to prevent digital noise coupling into the analog inputs. The 48-LQFP exposed thermal pad is internally connected to analog ground and should be soldered to a continuous ground pour with multiple thermal vias to a dedicated internal ground plane for heat spreading and stable reference operation.
Do not toggle the PGA gain pins (G0/G1/G2) during an active conversion, as this will corrupt the sample and produce code errors of tens to hundreds of LSBs. According to the ADI datasheet, the WR/CONVST pin falling edge starts conversion and must not be asserted while SCLK is active or during the read cycle. When using the internal 2.5 V reference, ensure adequate settling time after power-up (typically 1 ms) before initiating conversions; for highest accuracy use an external ADR435 reference with the internal reference disabled via the control register.
Compliance Information
RoHS compliance confirmed per Analog Devices product page and distributor listings (DigiKey, Mouser). Industrial temperature grade per package marking -5 suffix. Halogen-free status not explicitly stated in retrieved web data; consult ADI environmental compliance documentation for confirmation. Not AEC-Q100 qualified - this part targets industrial process control and instrumentation, not automotive.
