Analog Devices Inc. AD7665ACP

Overview

AD7665ACP from Analog Devices is a 16-bit, 570 kSPS charge redistribution SAR analog-to-digital converter operating from a single 5 V supply. It delivers ±2.5 LSB INL, 90 dB SNR at 180 kHz, and supports bipolar (±10 V, ±5 V, ±2.5 V) and unipolar (0–10 V, 0–5 V, 0–2.5 V) input ranges. It serves as the high-speed precision front-end ADC in data acquisition systems requiring no pipeline delay and simultaneous channel sampling.

For engineers reviewing the AD7665ACP datasheet, AD7665ACP pinout, AD7665ACP application, or AD7665ACP equivalent, key selection considerations include Warp/Normal/Impulse mode trade-offs, 48-lead LQFP vs. LFCSP package compatibility, 570 kSPS throughput with 1.75 µs conversion cycle, and dual serial (SPI/QSPI/MICROWIRE/DSP-compatible) and parallel (8-/16-bit) interface flexibility.

Technical Context

The AD7665ACP implements a charge redistribution SAR architecture with an integrated resistor-based input scaler enabling programmable analog input ranges without external components. Its internal conversion clock, factory-calibrated error correction circuitry, and dual-mode control logic support three distinct operational modes: Warp (570 kSPS, minimum inter-conversion interval), Normal (500 kSPS, full accuracy independent of rate), and Impulse (444 kSPS, power scaled to throughput).

It features separate analog (AVDD/AGND), digital (DVDD/DGND), and I/O interface (OVDD/OGND) power domains, with dedicated REFGND and INGND pins for precision reference and analog input grounding. The device guarantees no missing codes across its full 16-bit range and provides immediate data availability post-conversion with zero pipeline latency.

Key Specifications

Pinout & Package

AD7665ACP is available in a 48-lead LQFP (ST-48) package with exposed paddle connected to AGND. Pin functions are fully defined in the Analog Devices datasheet Rev. C, including dual-role pins for serial/parallel operation and mode-select inputs (WARP, IMPULSE, SER/PAR).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7664ACPZ and AD7671ASTZ, the AD7665ACP uniquely balances 570 kSPS Warp Mode, single 5 V supply, Impulse Mode power scaling, and pin compatibility with legacy AD7663/AD7664 - making it optimal for upgrading existing designs while adding speed headroom and thermal efficiency.

Availability

AD7665ACP is available at Aetrix Electronics and suitable for data acquisition, communications test equipment, and medical instrumentation requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for AD7665ACP 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 AD7665ACP belongs to the PulSAR® family of precision SAR ADCs, designed specifically for high-speed, low-latency, wide-dynamic-range measurement in industrial, medical, and communications systems.

FAQ

What are the supported analog input voltage ranges for the AD7665ACP?

The AD7665ACP supports bipolar input ranges of ±10 V, ±5 V, and ±2.5 V, and unipolar ranges of 0–10 V, 0–5 V, and 0–2.5 V. These are configured using external connections to the INA(R), INB(2R), INC(4R), and IND(4R) pins per Table I in the datasheet. The AD7665ACP's internal resistive scaler ensures consistent 0–2.5 V DAC input regardless of selected range, maintaining accuracy across all configurations.

Does the AD7665ACP require an external reference voltage?

Yes, the AD7665ACP requires an external reference voltage applied to the REF pin, with REFGND tied to a clean analog ground. The reference voltage must be between 2.3 V and 2.5 V (or AVDD – 1.85 V), and the device draws up to 114 µA from it at 570 kSPS. Using a low-noise, high-stability reference such as the ADR435 is recommended to achieve specified INL and SNR performance in the AD7665ACP.

How does the Warp Mode differ from Normal Mode in the AD7665ACP?

In Warp Mode (WARP = HIGH, IMPULSE = LOW), the AD7665ACP achieves 570 kSPS throughput with a 1.75 µs conversion cycle, but requires a minimum inter-conversion interval to maintain full accuracy. In Normal Mode (both WARP and IMPULSE LOW), it operates at 500 kSPS with no minimum interval constraint - ensuring full dc and ac specifications across arbitrary sampling rates. This makes Normal Mode preferable for asynchronous or event-triggered acquisition in the AD7665ACP.

Can the AD7665ACP interface directly with a 3 V microcontroller?

Yes, the AD7665ACP supports 3 V logic levels via its OVDD supply (2.7–5.25 V) and configurable digital I/Os. When OVDD = 3 V, the serial interface (SDOUT, SCLK, SYNC) and parallel data outputs operate at 3 V logic thresholds, enabling direct connection to 3 V FPGAs or MCUs without level shifters. The AD7665ACP's VIH/VIL specs guarantee compatibility with standard 3 V CMOS interfaces.

Is the AD7665ACP pin-compatible with earlier Analog Devices ADCs?

Yes, the AD7665ACP is pin-to-pin compatible with the AD7663 and AD7664, sharing identical 48-lead LQFP and LFCSP footprints, power pin assignments, and interface signal mapping. This allows drop-in replacement in existing designs to gain Warp Mode speed, improved SNR, and Impulse Mode power scaling - all without PCB modification or firmware changes for the AD7665ACP.