Analog Devices Inc. AD7470ARUZ

Overview

AD7470ARUZ from Analog Devices is a 10-bit, 1.75 MSPS successive approximation ADC with parallel interface, designed for high-speed data acquisition in space-constrained industrial and instrumentation systems. It operates from a single 2.7 V to 5.25 V supply, consumes just 3.34 mW at 3 V/1.5 MSPS, and features a 0 V to 2.5 V analog input range referenced to an external 2.5 V source.

For engineers reviewing the AD7470ARUZ datasheet, AD7470ARUZ pinout, AD7470ARUZ application, or AD7470ARUZ equivalent, key selection considerations include its 24-lead TSSOP package, no-pipeline-delay architecture, sleep-mode current of 1 µA, and compatibility with 3 V or 5 V digital logic via independent VDRIVE supply.

Technical Context

The AD7470ARUZ implements a track-and-hold amplifier followed by a 10-bit SAR core, with conversion initiated on the falling edge of CONVST and completion signaled by BUSY going low after 12 clock cycles. Its timing is fully deterministic-no pipeline latency-and acquisition begins immediately after BUSY falls, enabling precise synchronization in real-time control loops.

All digital I/O (CS, RD, DB0–DB9) are three-state, driven by VDRIVE (2.7 V to 5.25 V), allowing independent interfacing to 3 V or 5 V logic while AVDD/DVDD power the analog/digital sections. The part supports flexible throughput management via externally applied CLK IN (up to 30 MHz at 5 V), with automatic sleep entry when CONVST remains low post-conversion.

Key Specifications

Pinout & Package

AD7470ARUZ is housed in a 24-lead TSSOP (RU-24) package with 0.65 mm lead pitch, optimized for compact PCB layouts and thermal performance (θJA = 115°C/W). Pin 1 is marked by a dot; pins 13 and 24 are NC (no connect).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7472ARUZ, AD7470ARUZ delivers higher throughput and lower power at 10-bit resolution; compared with MAX1186ECM+, it provides deterministic parallel timing and external reference flexibility at the cost of larger footprint and interface complexity.

Availability

AD7470ARUZ is available at Aetrix Electronics and suitable for industrial sensor interface, portable test equipment, and high-speed data acquisition systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for AD7470ARUZ 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 AD7470/AD7472 family was engineered for high-speed, low-power data acquisition in space- and power-constrained industrial, instrumentation, and communications systems-prioritizing deterministic timing, flexible voltage operation, and minimal external component count.

FAQ

What is the maximum clock frequency supported by AD7470ARUZ?

The AD7470ARUZ supports up to 30 MHz CLK IN at 5 V supply and up to 24 MHz at 3 V supply. At 30 MHz, the 12-clock conversion cycle yields a 1.75 MSPS throughput rate. Exceeding these frequencies violates timing specifications and may cause conversion errors or increased jitter.

Does AD7470ARUZ require an external reference, and what tolerance is specified?

Yes, AD7470ARUZ requires an external 2.5 V reference applied to the REF IN pin. For full specification compliance-including SINAD, INL, and gain error-the reference must be stable within ±1% of 2.5 V. Deviations beyond this degrade DC accuracy and dynamic performance proportionally.

Can AD7470ARUZ interface directly with a 3 V microcontroller while operating its analog section at 5 V?

Yes. AD7470ARUZ supports independent supply domains: AVDD/DVDD can be set to 5 V for optimal analog performance, while VDRIVE is configured to 3 V to match the microcontroller's logic high level (VOH = VDRIVE – 0.2 V). AGND and DGND must remain within 0.3 V of each other.

How does the auto-sleep mode function in AD7470ARUZ?

In auto-sleep mode, AD7470ARUZ enters a 1 µA standby state automatically when CONVST remains low after BUSY goes low. It wakes on the next rising edge of CONVST with ≤1 µs latency. This mode is ideal for intermittent sampling applications like battery-powered condition monitoring.

Is AD7470ARUZ pin-compatible with AD7472ARUZ?

No. Although both use 24-lead TSSOP packages, AD7470ARUZ has DB0–DB9 outputs (10-bit), while AD7472ARUZ has DB0–DB11 (12-bit). Pin functions differ: AD7472ARUZ uses pins previously NC on AD7470ARUZ (e.g., DB10/DB11), making them electrically and logically incompatible without PCB redesign.