AD7264BSTZ-5-RL7
AD7264BSTZ-5-RL7 - 14-Bit Dual 500kSPS SAR ADC | Analog Devices
The Analog Devices AD7264BSTZ-5-RL7 is a dual, 14-bit, simultaneous-sampling successive-approximation-register (SAR) analog-to-digital converter (ADC) with on-chip programmable gain amplifiers and four comparators, operating from a single 5 V analog supply. It features dual true-differential analog input channels, throughput of 500 kSPS per channel (the AD7264-5 variant), and is housed in a 48-pin LQFP (ST-7x7 mm) package supplied on a 7-inch reel.
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.
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