Analog Devices Inc. AD7951BCPZ

Overview

AD7951BCPZ from Analog Devices is a 14-bit, 1 MSPS successive approximation register (SAR) analog-to-digital converter with programmable unipolar/bipolar input ranges (±5 V, ±10 V, 0–5 V, 0–10 V), iCMOS® process technology, no pipeline delay, and dual parallel/serial (SPI-/QSPI™-/MICROWIRE™-/DSP-compatible) interface. It serves as a high-speed precision data acquisition front-end in systems requiring accurate DC and AC performance, such as automated test equipment and medical imaging signal chains.

For engineers reviewing the AD7951BCPZ datasheet, AD7951BCPZ pinout, AD7951BCPZ application, or AD7951BCPZ equivalent, key selection considerations include its warp/normal/impulse mode throughput scaling (1 MSPS / 800 kSPS / 670 kSPS), ±1 LSB max INL, 85 dB SNR at 2 kHz, internal 5 V reference with 3 ppm/°C drift, and 48-lead LFCSP (7 mm × 7 mm) package with exposed pad.

Technical Context

The AD7951BCPZ implements a charge redistribution SAR architecture with integrated conversion clock, error correction, and configurable analog input range selection via hardware pins or serial configuration port. Its three sampling modes-warp (1 μs cycle), normal (1.25 μs), and impulse (1.49 μs)-enable dynamic power-throughput trade-offs without sacrificing linearity or noise performance.

It supports true bipolar operation with dedicated BIPOLAR/TEN pins, offers both parallel (14-bit or byte-swappable 8-bit bus) and serial interfaces, and integrates an on-chip temperature sensor (311 mV @ 25°C, 1 mV/°C) alongside internal reference and buffer circuitry-all operating across −40°C to +85°C.

Key Specifications

Pinout & Package

AD7951BCPZ is housed in a 48-lead LFCSP (7 mm × 7 mm) package with exposed thermal pad (connected to VEE per datasheet). Pin functions are validated per Analog Devices' AD7951 Rev. B datasheet, Figure 4 and Table 6.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed SAR ADC applications.

Compared with AD7951BCPZ, AD7654ASTZ trades speed and bipolar capability for higher resolution and lower power at 500 kSPS, while ADS8860IPWR matches throughput and integrates reference but removes parallel interface and hardware range selection-making AD7951BCPZ optimal for mixed-signal systems needing deterministic timing, wide input flexibility, and multi-processor compatibility.

Availability

AD7951BCPZ is available at Aetrix Electronics and suitable for process control, medical instrumentation, and high-speed data acquisition requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for AD7951BCPZ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.

The AD7951BCPZ belongs to the PulSAR® family of precision SAR ADCs designed for high-speed, low-latency data acquisition in industrial, medical, and test equipment where accuracy, speed, and configurability are co-critical.

FAQ

What input voltage ranges does the AD7951BCPZ support?

The AD7951BCPZ supports four hardware-programmable input ranges: 0 V to 5 V, 0 V to 10 V, ±5 V, and ±10 V. Selection is made using the BIPOLAR and TEN pins per Table 6 of the datasheet. These ranges are implemented without external gain stages or level-shifting circuitry, and the AD7951BCPZ maintains specified INL and SNR across all configurations. The device's iCMOS® process enables rail-to-rail analog input compliance relative to AGND.

Does the AD7951BCPZ require an external reference?

No-the AD7951BCPZ includes a 5 V internal reference with ±0.35% initial accuracy and ±3 ppm/°C temperature drift, accessible on the REF pin when PDREF and PDBUF are low. An external reference (4.75 V to AVDD + 0.1 V) may be used by setting PDREF/PDBUF high, and the internal reference buffer can condition a 2.5 V input to 5 V on REF via REFBUFIN. The AD7951BCPZ's reference architecture eliminates mandatory external components while retaining design flexibility.

How does the AD7951BCPZ handle power management in low-throughput applications?

The AD7951BCPZ supports three sampling modes-warp (1 MSPS), normal (800 kSPS), and impulse (670 kSPS)-where power scales with throughput. In addition, the PD pin enables full power-down mode (<10 µW), and individual blocks (reference, buffer) can be disabled via PDREF/PDBUF. At 100 kSPS, the AD7951BCPZ dissipates only 10 mW, making it suitable for battery-powered DAQ nodes without compromising conversion integrity or latency.

Can the AD7951BCPZ interface directly with a 3.3 V microcontroller?

Yes-the AD7951BCPZ's OVDD supply (2.7 V to 5.5 V) powers its digital I/O, allowing direct connection to 3.3 V logic. Its serial interface is SPI-/QSPI™-/MICROWIRE™-/DSP-compatible, and parallel mode supports 8-bit or 14-bit data buses with BYTESWAP control. All digital inputs accept VIH ≥ 2.1 V and VIL ≤ 0.6 V at OVDD = 3.3 V, and outputs drive VOH ≥ OVDD − 0.6 V and VOL ≤ 0.4 V-ensuring robust interoperability with common 3.3 V MCUs without level shifters.

What is the role of the TEMP pin on the AD7951BCPZ?

The TEMP pin on the AD7951BCPZ provides an analog voltage output proportional to die temperature: 311 mV at 25°C with 1 mV/°C sensitivity. It is enabled only when the internal reference is active (PDREF = PDBUF = low). This on-chip sensor allows system-level thermal monitoring without adding discrete components, supporting thermal derating, fault detection, or ambient compensation algorithms-particularly valuable in sealed medical or industrial enclosures where external sensors are impractical.