Analog Devices Inc. AD7664ACP

Overview

AD7664ACP from Analog Devices is a 16-bit, 570 kSPS unipolar successive-approximation ADC with single 5 V supply operation, internal track-and-hold, and dual serial/parallel interface. It delivers 2.5 LSB max INL, 90 dB SNR at 45 kHz, and operates across –40°C to +85°C in LQFP packaging. Used in high-speed data acquisition systems requiring no pipeline delay and precise DC/AC performance.

For engineers reviewing the AD7664ACP datasheet, AD7664ACP pinout, AD7664ACP application, or AD7664ACP equivalent, key selection criteria include throughput mode flexibility (Warp/Normal/Impulse), 0 V to 2.5 V analog input range, 3 V/5 V interface compatibility, and guaranteed no missing codes over full 16-bit resolution.

Technical Context

The AD7664ACP implements a charge redistribution SAR architecture with on-chip calibration logic, enabling 16-bit accuracy without external trimming. Its conversion core uses a binary-weighted capacitor DAC array and precision comparator, delivering immediate result availability with zero pipeline latency.

Three hardware-selectable operating modes-Warp (570 kSPS), Normal (500 kSPS), and Impulse (444 kSPS)-dynamically scale power consumption: 115 mW max in Warp, 21 µW at 100 SPS in Impulse, and 7 µW in power-down. Interface flexibility includes parallel 16-bit bus or SPI/QSPI/MICROWIRE-compatible 2-wire serial port.

Key Specifications

Pinout & Package

AD7664ACP is packaged in a 48-lead LQFP (Lead Quad Flat Pack) with exposed pad grounded per datasheet Note 2. Pin functions are validated per Analog Devices REV. F datasheet Section "PIN FUNCTION DESCRIPTIONS" and "PIN CONFIGURATION".

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7660ASTZ and AD7666ASTZ, the AD7664ACP uniquely combines unipolar 0–2.5 V input, 570 kSPS Warp Mode, and ±2.5 LSB INL in a single 48-lead LQFP - making it the only drop-in solution for high-accuracy, high-throughput unipolar data acquisition without redesigning signal conditioning or layout.

Availability

AD7664ACP is available at Aetrix Electronics and suitable for high-speed data acquisition, medical instrumentation, digital signal processing, and battery-powered systems requiring stable component supply and long-term obsolescence management.

Supply support for AD7664ACP 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 AD7664ACP belongs to Analog Devices' PulSAR® family of precision SAR ADCs, engineered for applications demanding high speed, low power, and exceptional DC/AC accuracy without pipeline latency.

FAQ

What is the maximum sampling rate of the AD7664ACP and under what conditions is it achieved?

The AD7664ACP achieves a maximum sampling rate of 570 kSPS in Warp Mode, which requires the time between conversions to be ≤1 ms to guarantee full specified accuracy. This mode is enabled by asserting WARP = HIGH and IMPULSE = LOW. The AD7664ACP maintains this rate with 2.5 LSB INL and 90 dB S/(N+D) when operated within its specified AVDD = 5 V, –40°C to +85°C envelope.

Does the AD7664ACP require an external reference voltage, and what are the acceptable voltage ranges?

Yes, the AD7664ACP requires an external reference voltage applied to the REF pin, with a valid range of 2.3 V to 2.5 V (or AVDD – 1.85 V, whichever is lower). The reference must be low-noise and well-decoupled; typical implementations use a precision 2.5 V reference like the ADR431. REFGND must be connected directly to AGND to maintain specified INL and THD performance.

How does the AD7664ACP handle power management in low-duty-cycle applications?

The AD7664ACP supports three power-optimized states: Impulse Mode reduces current proportionally to throughput (e.g., 21 µW at 100 SPS), Power-Down Mode draws ≤7 µW with conversions inhibited, and Normal Mode balances speed and efficiency at 500 kSPS. All modes retain configuration registers and require no reinitialization upon wake-up, enabling rapid transition between active and standby states in battery-powered designs.

Is the AD7664ACP pin-compatible with other devices in the PulSAR family, and which ones?

Yes, the AD7664ACP is pin-to-pin compatible with the AD7660ASTZ in the same 48-lead LQFP package, allowing direct upgrade paths. It is also footprint-compatible with the AD7666ASTZ, though AD7666 supports differential inputs while AD7664ACP is unipolar-only - requiring front-end redesign if substituting between them. No PCB changes are needed when replacing AD7660ASTZ with AD7664ACP.

What digital interface options does the AD7664ACP support, and how are they selected?

The AD7664ACP supports both parallel and serial interfaces via the SER/PAR pin: SER/PAR = LOW enables 16-bit parallel D[15:0] output with CS/RD handshaking; SER/PAR = HIGH configures pins D4–D11 as serial interface signals (SDOUT/SCLK/SYNC/SDIN). The serial mode is SPI/QSPI/MICROWIRE-compatible and supports master or slave clocking, selectable via EXT/INT and INVSCLK inputs - all without changing hardware connections.