Analog Devices Inc. AD7477ARTZ-REEL7

Overview

AD7477ARTZ-REEL7 from Analog Devices is a 10-bit, 1 MSPS successive-approximation ADC in a 6-lead SOT-23 package, operating from 2.7 V to 5.25 V supply. It delivers 61 dB SINAD at 100 kHz input, 70 dB SNR (typ), and 400 ns track-and-hold acquisition time, serving as a compact analog-to-digital front-end for portable instrumentation and sensor interfaces.

For engineers reviewing the AD7477ARTZ-REEL7 datasheet, AD7477ARTZ-REEL7 pinout, AD7477ARTZ-REEL7 application, or AD7477ARTZ-REEL7 equivalent, key selection criteria include its 10-bit resolution with no missing codes, SPI-compatible serial interface, internal VDD-referenced full-scale range (0 V to VDD), low 1 μA standby current, and guaranteed operation down to 2.0 V supply voltage.

Technical Context

The AD7477ARTZ-REEL7 implements a standard successive-approximation register (SAR) architecture with no pipeline delay, enabling deterministic single-shot conversion timing. Sampling is triggered on the falling edge of CS, and conversion completes in exactly 16 SCLK cycles - e.g., 800 ns max at 20 MHz SCLK.

Its track-and-hold amplifier supports full-power bandwidth up to 6.5 MHz and maintains 70 dB SNR at 100 kHz input frequency. The reference is derived directly from VDD, eliminating external reference components while fixing the input range to 0 V to VDD.

Key Specifications

Pinout & Package

AD7477ARTZ-REEL7 is housed in a RoHS-compliant, Pb-free 6-lead SOT-23 package (JEDEC MO-178AA), measuring 2.9 mm × 1.6 mm × 1.1 mm, with gull-wing leads and thermal pad not connected internally.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7822IDR and MAX1116EUT+T, AD7477ARTZ-REEL7 uniquely combines 10-bit resolution, 1 MSPS throughput, VDD-referenced flexibility, and sub-μA shutdown in a 6-lead SOT-23 - making it optimal for miniaturized, single-supply, battery-conscious designs where accuracy and timing determinism are essential.

Availability

AD7477ARTZ-REEL7 is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered data loggers, optical sensor interfaces, and industrial handheld testers requiring stable component supply across extended production lifecycles.

Supply support for AD7477ARTZ-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 AD7476/AD7477/AD7478 family was designed specifically to deliver high-speed, low-power, single-supply SAR ADC functionality in the smallest possible footprint - targeting space- and energy-constrained portable and instrumentation applications.

FAQ

What is the maximum sampling rate supported by the AD7477ARTZ-REEL7?

The AD7477ARTZ-REEL7 supports a maximum throughput rate of 1 MSPS under specified conditions: VDD = 2.7 V to 5.25 V and SCLK = 20 MHz. Conversion time is fixed at 16 SCLK cycles, so actual rate scales linearly with clock frequency - e.g., 500 kSPS at 10 MHz SCLK. This is confirmed in Table 2 of the Rev. F datasheet.

Does the AD7477ARTZ-REEL7 require an external voltage reference?

No, the AD7477ARTZ-REEL7 does not require an external voltage reference. Its reference is derived internally from the VDD supply, establishing a full-scale input range of 0 V to VDD. This eliminates external reference components and simplifies design, as explicitly stated in the General Description and Product Highlights sections of the datasheet.

What is the guaranteed operating temperature range for the AD7477ARTZ-REEL7?

The AD7477ARTZ-REEL7 is rated for the commercial temperature range of −40°C to +85°C, corresponding to the "A" version designation per the Ordering Guide and Absolute Maximum Ratings table. This is distinct from the "S" version (−55°C to +125°C) and applies specifically to the ARTZ-REEL7 variant.

How is data formatted on the SDATA pin of the AD7477ARTZ-REEL7?

The AD7477ARTZ-REEL7 outputs a 16-bit serial word on SDATA: four leading zeros, followed by the 10-bit conversion result (MSB first), followed by two trailing zeros. This format ensures consistent 16-bit framing for microcontroller SPI peripherals, and is documented in the Pin Function Descriptions section (Table 6) of the datasheet.

Can the AD7477ARTZ-REEL7 operate from a 2.5 V supply?

Yes, the AD7477ARTZ-REEL7 can operate from a 2.5 V supply. While the recommended VDD range is 2.7 V to 5.25 V, the datasheet states in Table 2 footnote 2 that the A version is operational down to 2.0 V - with VINH reduced to 1.8 V minimum. Performance specifications (e.g., SINAD, power) are characterized from 2.7 V, but functional operation is assured at 2.5 V.