Analog Devices Inc. AD7652ACP

Overview

AD7652ACP from Analog Devices is a 16-bit, 500 kSPS PulSAR® charge redistribution SAR analog-to-digital converter operating from a single 5 V supply, featuring an internal 2.5 V reference (±7 ppm/°C drift), 0 V to 2.5 V unipolar input range, and no pipeline delay-used in high-accuracy data acquisition systems requiring low-latency sampling.

For engineers reviewing the AD7652ACP datasheet, AD7652ACP pinout, AD7652ACP application, or AD7652ACP equivalent, this page delivers verified specifications, functional interface details, real-world use cases in instrumentation and spectrum analysis, and validated alternative options for design continuity and sourcing flexibility.

Technical Context

The AD7652ACP implements a switched-capacitor SAR architecture with on-chip calibration logic and error correction circuitry, enabling true 16-bit resolution without missing codes over –40°C to +85°C. Its internal reference buffer supports both buffered and unbuffered external reference configurations via PDREF and PDBUF control pins.

It offers dual-mode digital interfacing: parallel 16-bit bus (with BYTESWAP and OB/2C configuration) or flexible serial (SPI-/QSPI-/MICROWIRE-/DSP-compatible) using programmable SCLK timing, SYNC polarity (INVSYNC), and clock source selection (EXT/INT), all operating at OVDD = 2.7 V to 5.25 V for mixed-voltage system integration.

Key Specifications

Pinout & Package

AD7652ACP is housed in a 48-lead LQFP package (7 mm × 7 mm, 0.5 mm pitch), thermally enhanced for industrial temperature operation (–40°C to +85°C). Pin assignments are fully defined per Analog Devices' Rev. 0 datasheet Figure 4 and Table 6.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit SAR ADC applications.

Compared with AD7652BCPZ, the AD7652ACP offers identical functionality in a more manufacturable LQFP package but with higher thermal resistance; versus AD7651ACPZ, it delivers double the throughput and superior dynamic range-making AD7652ACP the optimal choice for high-fidelity, latency-critical measurement systems.

Availability

AD7652ACP is available at Aetrix Electronics and suitable for data acquisition, instrumentation, and medical instruments requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature grade performance.

Supply support for AD7652ACP 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 AD7652ACP belongs to the PulSAR® family of precision SAR ADCs designed specifically for high-speed, high-accuracy measurement applications where zero-latency, low power, and integrated reference stability are essential.

FAQ

What is the maximum sampling rate supported by the AD7652ACP?

The AD7652ACP supports a maximum throughput rate of 500 kSPS, corresponding to a complete conversion cycle time of 2 µs. This is confirmed in the datasheet's Specifications table (Table 2) and Timing Specifications (Table 3, t2 = 2 µs). The device achieves this rate while maintaining 16-bit resolution, no missing codes, and full AC performance-including 86 dB SNR and 98 dB SFDR at 100 kHz input-making AD7652ACP suitable for demanding real-time signal capture applications.

Does the AD7652ACP require an external reference voltage?

No, the AD7652ACP does not require an external reference voltage-it integrates a precision 2.5 V internal reference with ±7 ppm/°C temperature drift and ±0.12% full-scale error over temperature. However, it supports external reference operation via the REFBUFIN pin when PDREF is set HIGH. The AD7652ACP's internal reference is factory-trimmed and requires only a 10 µF capacitor on the REF pin for 5 ms turn-on settling, simplifying system design while retaining flexibility for higher-accuracy external references.

How does the AD7652ACP handle interface selection between parallel and serial modes?

The AD7652ACP selects interface mode via the SER/PAR pin: LOW enables the 16-bit parallel data bus (D[0:15]), while HIGH configures pins D[0:15] for serial functions (SDOUT, SCLK, SYNC, etc.). This is explicitly defined in Table 6 (Pin Function Descriptions) and Figure 4. The AD7652ACP maintains full functionality in both modes-including BYTESWAP and OB/2C configuration-and supports SPI/QSPI/MICROWIRE protocols. No hardware changes are needed to switch modes; only the SER/PAR logic level and associated firmware initialization differ.

What is the purpose of the TEMP pin on the AD7652ACP?

The TEMP pin on the AD7652ACP provides a calibrated analog voltage output proportional to die temperature: 300 mV at 25°C with a sensitivity of 1 mV/°C. As specified in Table 2 (Temperature Pin section), this output has 4.3 kΩ source impedance and enables on-chip thermal monitoring without external sensors. In practice, the AD7652ACP's TEMP pin allows firmware to compensate for temperature-dependent errors in reference voltage (±7 ppm/°C) and full-scale gain, improving long-term measurement stability in uncontrolled environments.

Can the AD7652ACP operate from a 3 V digital interface supply?

Yes, the AD7652ACP supports 3 V digital interface operation via its dedicated OVDD supply pin (Pin 18), which accepts 2.7 V to 5.25 V. The datasheet confirms OVDD independence from AVDD/DVDD (both nominally 5 V), and all digital inputs (VIH min = 2.0 V) and outputs (VOH min = OVDD – 0.6 V) are fully compatible with 3 V logic families. This allows the AD7652ACP to interface directly with 3 V microcontrollers or FPGAs while maintaining full 5 V analog performance-verified in Table 2 and Figure 2's load circuit definition for CL = 10 pF in serial mode.