Analog Devices Inc. AD7665ASTRL

Overview

AD7665ASTRL 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) and unipolar (0–10 V) input ranges. It serves as the precision front-end ADC in high-speed data acquisition systems requiring no pipeline delay.

For engineers reviewing the AD7665ASTRL datasheet, AD7665ASTRL pinout, AD7665ASTRL application, or AD7665ASTRL equivalent, key selection criteria include Warp/Normal/Impulse mode timing control, dual serial/parallel interface flexibility (SPI/QSPI/MICROWIRE compatible), and factory-calibrated DC/AC performance across –40°C to +85°C.

Technical Context

The AD7665ASTRL implements a charge redistribution SAR architecture with an internal switched-capacitor DAC, track-and-hold, and error correction circuitry. Its three operational modes-Warp (1.75 µs conversion), Normal (2 µs), and Impulse (2.25 µs, power-scaled)-are selected via dedicated WARP and IMPULSE digital inputs.

It integrates a resistor-based analog input scaler enabling six configurable voltage ranges (e.g., ±5 V, 0–5 V) without external components, and features both parallel (8/16-bit) and 2-wire serial interfaces with OVDD support for 3 V or 5 V logic compatibility.

Key Specifications

Pinout & Package

AD7665ASTRL is packaged in a 48-lead LQFP (ST-48) with exposed paddle connected to AGND. Pin functions are validated per Analog Devices' official pin description table (Rev. C, pp. 6–7).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7665ASTRL, AD7663ASTZ offers identical feature set at lower speed and cost, while ADS8860IDRCT trades parallel interface and hardware-configurable ranges for higher speed and lower voltage operation - making AD7665ASTRL optimal for industrial DAQ requiring flexibility, speed, and robustness.

Availability

AD7665ASTRL is available at Aetrix Electronics and suitable for data acquisition, communications test equipment, and medical instrumentation requiring stable component supply across extended temperature and long production lifecycles.

Supply support for AD7665ASTRL 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 AD7665ASTRL belongs to the PulSAR® family of precision SAR ADCs, designed specifically for high-speed, low-latency, wide-dynamic-range measurement systems in industrial, medical, and test equipment.

FAQ

What is the maximum sampling rate of the AD7665ASTRL and under what conditions?

The AD7665ASTRL achieves a maximum sampling rate of 570 kSPS in Warp Mode, which requires WARP = HIGH and IMPULSE = LOW. This mode mandates a minimum conversion rate to maintain full specified accuracy; timing is validated at 1.75 µs per conversion with CNVST triggering. The AD7665ASTRL must be operated within its specified AVDD/DVDD = 5 V ±5% and temperature range (–40°C to +85°C) to guarantee this performance.

Does the AD7665ASTRL support both bipolar and unipolar analog input ranges?

Yes, the AD7665ASTRL supports both bipolar (e.g., ±10 V, ±5 V, ±2.5 V) and unipolar (e.g., 0–10 V, 0–5 V, 0–2.5 V) input ranges. Range selection is implemented via external connections to the IND(4R), INC(4R), INB(2R), and INA(R) pins per Table I in the datasheet. No external op-amps or level-shifting circuitry are required - the internal resistor scaler handles all configurations.

How does the AD7665ASTRL handle power management in low-duty-cycle applications?

The AD7665ASTRL provides three power-optimized modes: Warp (full speed), Normal (balanced), and Impulse (throughput-scaled). In Impulse Mode (IMPULSE = HIGH, WARP = LOW), power dissipation scales linearly with sampling rate - e.g., 15 µW at 100 SPS. Additionally, a dedicated PD pin enables hardware power-down, reducing current to 7 µW max for standby intervals between acquisition bursts.

Can the AD7665ASTRL interface directly with 3 V microcontrollers?

Yes, the AD7665ASTRL supports 3 V logic interfacing via its OVDD pin, which powers the digital I/O section. When OVDD is set to 3 V, all digital outputs (D[15:0], BUSY, SYNC, SDOUT) and inputs (CS, RD, SER/PAR) operate at 3 V logic levels - verified by VIH/VIL specifications (VIH min = 2.0 V, VIL max = 0.8 V). DVDD remains at 5 V for core logic, ensuring full functionality without level shifters.

Is the AD7665ASTRL pin-compatible with earlier devices in the same family?

Yes, the AD7665ASTRL is pin-to-pin compatible with the AD7663ASTZ and AD7664ASTZ in the same 48-lead LQFP package. This allows direct drop-in replacement in existing designs, with functional enhancements including higher throughput (570 kSPS vs. 500 kSPS), Impulse Mode power scaling, and improved AC specs (e.g., 90 dB SNR vs. 89 dB typ). No PCB changes are required for migration.