Analog Devices Inc. AD7667ACPZ

Overview

AD7667ACPZ from Analog Devices is a 16-bit, 1 MSPS charge redistribution SAR analog-to-digital converter with integrated 2.5 V reference, unipolar 0 V to 2.5 V input range, ±2.0 LSB INL, and SPI/parallel interface - used in high-speed data acquisition systems requiring precision timing and low power scaling.

For engineers reviewing the AD7667ACPZ datasheet, AD7667ACPZ pinout, AD7667ACPZ application, or AD7667ACPZ equivalent, this page delivers verified electrical parameters, mode-specific throughput behavior (Warp/Normal/Impulse), real-world SNR/THD performance at 20 kHz, thermal drift of internal reference, and confirmed pin-to-pin compatibility with AD7671 and AD7677 for drop-in replacement evaluation.

Technical Context

The AD7667ACPZ implements a factory-calibrated charge redistribution SAR architecture with on-chip error correction, eliminating pipeline delay and enabling immediate data availability post-conversion. It supports three hardware-selectable operating modes: Warp (1 µs conversion, 1 MSPS), Normal (1.25 µs, 800 kSPS), and Impulse (1.5 µs, 666 kSPS with throughput-scaled power).

Its dual-domain power architecture separates analog (AVDD/AGND), digital core (DVDD/DGND), and I/O interface (OVDD/OGND) supplies, while the internal 2.5 V reference exhibits ±3 ppm/°C typical drift and <50 ppm hysteresis - validated across –40°C to +85°C with no external trimming required.

Key Specifications

Pinout & Package

AD7667ACPZ is housed in a 48-lead LFCSP (Lead Frame Chip Scale Package) with exposed paddle, optimized for thermal dissipation and board space efficiency in compact instrumentation designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7667ACPZ, AD7671ASTZ offers identical functionality in LQFP but trades thermal efficiency for package familiarity, while AD7677ACPZ delivers measurable THD and power improvements within the same LFCSP footprint - making it the preferred upgrade path for new designs demanding higher spectral purity.

Availability

AD7667ACPZ is available at Aetrix Electronics and suitable for data acquisition, medical instrumentation, digital signal processing, and industrial process control applications requiring stable component supply and long-term lifecycle support.

Supply support for AD7667ACPZ 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, with R&D centers worldwide.

The AD7667ACPZ belongs to the PulSAR® family of precision SAR ADCs, engineered specifically for high-speed, low-latency data acquisition in test equipment, medical devices, and industrial automation where accuracy, speed, and power efficiency must coexist.

FAQ

What is the maximum sampling rate of the AD7667ACPZ in Warp mode?

The AD7667ACPZ achieves a maximum throughput of 1 MSPS in Warp mode, with a complete conversion cycle of 1 µs. This mode requires a minimum conversion rate to maintain full specified accuracy, and the BUSY signal remains HIGH for the entire duration before going LOW to indicate data readiness. The AD7667ACPZ supports this rate with no pipeline delay and immediate data availability upon BUSY deassertion.

Does the AD7667ACPZ require an external reference voltage?

No, the AD7667ACPZ includes a factory-trimmed 2.5 V internal reference with ±3 ppm/°C typical temperature drift. When PDREF is held LOW, the internal reference is enabled and buffered via REFBUFIN. An external reference may be used by pulling PDREF HIGH and applying 2.3 V to AVDD – 1.85 V to the REF pin - but the AD7667ACPZ is fully functional without any external reference components.

How does power consumption scale with throughput in Impulse mode?

In Impulse mode (IMPULSE = HIGH, WARP = LOW), the AD7667ACPZ dynamically scales power with sampling rate: it draws 130 µW at 1 kSPS and 87 mW at 666 kSPS. This linear scaling is achieved through internal clock gating and bias current modulation - verified in the datasheet's Power Dissipation vs. Throughput graph - allowing battery-powered AD7667ACPZ systems to extend runtime without sacrificing resolution.

Is the AD7667ACPZ pin-compatible with other PulSAR ADCs?

Yes, the AD7667ACPZ is pin-to-pin compatible with AD7671 and AD7677 in both 48-lead LQFP and 48-lead LFCSP packages. This includes identical pin functions for CNVST, BUSY, SER/PAR, WARP, IMPULSE, REF, and all data lines - enabling direct substitution in existing layouts and reuse of interface firmware without modification to the AD7667ACPZ design.

What digital interface options does the AD7667ACPZ support?

The AD7667ACPZ supports both parallel and serial interfaces via the SER/PAR pin. In parallel mode, it outputs 16-bit data on D[15:0] with RD/CS handshaking. In serial mode, it operates as SPI/QSPI/MICROWIRE/DSP-compatible master or slave using SDOUT, SCLK, and SYNC - with configurable polarity (INVSYNC), clock inversion (INVSCLK), and external/internal clock selection (EXT/INT) - all implemented natively in the AD7667ACPZ silicon.