Analog Devices Inc. AD7470ARUZ-REEL7

Overview

AD7470ARUZ-REEL7 from Analog Devices is a 10-bit, 1.75 MSPS successive approximation analog-to-digital converter (ADC) with parallel interface, operating from a single 2.7 V to 5.25 V supply. It features 33 pF input capacitance, ±1 LSB integral nonlinearity, and 60 dB SINAD at 500 kHz input frequency - optimized for high-speed data acquisition in industrial instrumentation and real-time control systems.

For engineers reviewing the AD7470ARUZ-REEL7 datasheet, AD7470ARUZ-REEL7 pinout, AD7470ARUZ-REEL7 application, or AD7470ARUZ-REEL7 equivalent, key selection criteria include its 12-clock-cycle conversion time, 531.66 ns BUSY-to-data-valid timing (at 26 MHz CLKIN), sleep-mode current of 1 µA, and TSSOP-24 package compatibility with space-constrained PCB layouts.

Technical Context

The AD7470ARUZ-REEL7 implements a standard SAR architecture with external clock control (CLKIN), CONVST-triggered sampling on falling edge, and no pipeline delay. Its track-and-hold amplifier supports full-power bandwidth up to 20 MHz and acquisition time of 135 ns, enabling accurate digitization of fast transient signals.

Conversion result is latched into a parallel output register and accessed via CS/RD handshake; DB0–DB9 are three-state outputs driven by VDRIVE (2.7 V to 5.25 V), allowing independent logic-level interfacing. REF IN requires an external 2.5 V ±1% reference, and analog/digital grounds (AGND/DGND) must be held within ±0.3 V.

Key Specifications

Pinout & Package

AD7470ARUZ-REEL7 is housed in a 24-lead TSSOP (RU-24) package with exposed pad for thermal enhancement (θJA = 115°C/W). Pin 1 is marked with dot; pins 13 and 24 are NC (no connect).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 10-bit high-speed parallel ADC applications.

Compared with AD7470BRUZ-REEL7, the AD7470ARUZ-REEL7 offers identical electrical performance at lower cost and qualification temperature; compared with AD7476AARMZ-REEL7, it trades serial interface simplicity for higher throughput and flexible logic-level output drive - making it preferable for FPGA/DSP interfacing and deterministic timing-critical loops.

Availability

AD7470ARUZ-REEL7 is available at Aetrix Electronics and suitable for industrial data acquisition, motor control feedback, and portable medical instrumentation requiring stable component supply, long-term lifecycle support, and RoHS-compliant TSSOP packaging.

Supply support for AD7470ARUZ-REEL7 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 product line was designed specifically for high-speed, low-power, precision data acquisition in space- and power-constrained industrial and instrumentation systems - emphasizing deterministic timing, flexible supply configuration, and robust thermal performance.

FAQ

What is the maximum clock frequency supported by AD7470ARUZ-REEL7?

The AD7470ARUZ-REEL7 supports a maximum CLKIN frequency of 30 MHz at 5 V supply and 24 MHz at 3 V supply. At 30 MHz, the device achieves its rated 1.75 MSPS throughput with a 12-clock-cycle conversion time. Exceeding these frequencies may cause timing violations or degraded AC performance, as specified in the absolute maximum ratings and timing tables of the AD7470 datasheet.

Does AD7470ARUZ-REEL7 require an external reference voltage?

Yes, AD7470ARUZ-REEL7 requires an external 2.5 V ±1% reference applied to the REF IN pin. The device does not include an internal reference; the full-scale input range is directly proportional to this externally supplied voltage (0 V to REF IN). Using a precision, low-noise 2.5 V reference such as the ADR431 ensures optimal INL and SNR performance.

Can AD7470ARUZ-REEL7 interface directly with 3 V logic systems?

Yes, AD7470ARUZ-REEL7 can interface directly with 3 V logic through its dedicated VDRIVE pin. By supplying 3 V to VDRIVE while operating AVDD/DVDD at 5 V, the DB0–DB9 outputs swing between 0 V and ~2.8 V - compatible with 3 V CMOS input thresholds. This eliminates external level shifters while preserving analog performance.

What is the purpose of the BUSY signal in AD7470ARUZ-REEL7?

The BUSY signal in AD7470ARUZ-REEL7 is an active-high status output that goes high at the start of conversion and returns low 531.66 ns after the falling edge of CONVST (at 26 MHz CLKIN), indicating the conversion result is latched and ready on the data bus. It enables precise handshaking with microprocessors or FPGAs without polling or fixed delays.

How does sleep mode operate in AD7470ARUZ-REEL7?

In AD7470ARUZ-REEL7, sleep mode activates automatically when CONVST remains low after BUSY goes low. The part enters ultra-low-power state (1 µA max current) and wakes on the next rising edge of CONVST with 1 µs typical wake-up time. This feature reduces average power in intermittent sampling applications such as battery-powered sensors or event-triggered data loggers.