Analog Devices Inc. AD7477ARTZ-500RL7

Overview

AD7477ARTZ-500RL7 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, delivering 61 dB SINAD at 100 kHz input and 4.8 mW power dissipation at 3 V/1 MSPS, used for high-speed data acquisition in portable instrumentation.

For engineers reviewing the AD7477ARTZ-500RL7 datasheet, AD7477ARTZ-500RL7 pinout, AD7477ARTZ-500RL7 application, or AD7477ARTZ-500RL7 equivalent, key selection considerations include its 10-bit resolution, SPI-compatible serial interface, no-pipeline-delay conversion architecture, 6.5 MHz full-power bandwidth, and guaranteed no-missed-codes performance.

Technical Context

The AD7477ARTZ-500RL7 implements a standard successive-approximation register (SAR) architecture with internal track-and-hold, sampling on the falling edge of CS and completing conversion in exactly 16 SCLK cycles. Its reference is derived directly from VDD, enabling a 0 V to VDD analog input range without external reference components.

It supports flexible serial clock management up to 20 MHz, delivers 70 dB SNR at 100 kHz input frequency, and enters standby mode drawing ≤1 μA - all while maintaining precise timing control via dedicated CS and SCLK inputs and avoiding pipeline latency.

Key Specifications

Pinout & Package

AD7477ARTZ-500RL7 is housed in a 6-lead SOT-23 package (2.9 mm × 1.6 mm × 1.1 mm), optimized for space-constrained PCB layouts in portable electronics.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7477ARTZ-500RL7, AD7477ARTZ-REEL7 offers identical performance in volume production format, while ADS7822U trades speed and integration for higher resolution and different supply architecture - making AD7477ARTZ-500RL7 optimal for compact, battery-efficient 1 MSPS systems requiring minimal external components.

Availability

AD7477ARTZ-500RL7 is available at Aetrix Electronics and suitable for portable medical instruments, optical sensing modules, industrial data loggers, and high-speed modem monitoring requiring stable component supply and long-term manufacturability.

Supply support for AD7477ARTZ-500RL7 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 over 50 years of innovation in precision data conversion and signal conditioning.

The AD7476/AD7477/AD7478 product line was designed specifically for space- and power-constrained applications requiring high-speed, single-supply, reference-free SAR ADCs - targeting portable instrumentation, sensor interfaces, and embedded control systems.

FAQ

What is the maximum sampling rate supported by the AD7477ARTZ-500RL7?

The AD7477ARTZ-500RL7 supports a maximum throughput rate of 1 MSPS under specified conditions: VDD = 2.7 V to 5.25 V and fSCLK = 20 MHz. This is achieved using 16 SCLK cycles per conversion, resulting in a fixed 800 ns conversion time. At lower clock speeds or reduced supply voltages, throughput scales proportionally - e.g., at 10 MHz SCLK, maximum rate drops to 500 kSPS.

Does the AD7477ARTZ-500RL7 require an external voltage reference?

No, the AD7477ARTZ-500RL7 does not require an external voltage reference. Its internal reference is derived directly from the VDD supply, establishing an analog input range of 0 V to VDD. This simplifies design by eliminating external reference ICs, reducing BOM count and PCB area - critical for compact portable systems where the AD7477ARTZ-500RL7 is commonly deployed.

How is the serial data formatted on the SDATA pin of the AD7477ARTZ-500RL7?

The AD7477ARTZ-500RL7 outputs a 14-bit serial frame on the SDATA pin: four leading zeros, followed by the 10-bit conversion result (MSB first), with no trailing bits. For example, a full-scale input yields "0000 1111111111". Data is clocked out on the falling edge of SCLK, and the output enters high-impedance state after the final bit, allowing multi-device SPI bus sharing.

What is the guaranteed DC accuracy of the AD7477ARTZ-500RL7?

The AD7477ARTZ-500RL7 guarantees ±1 LSB maximum integral nonlinearity (INL), ±0.9 LSB maximum differential nonlinearity (DNL), ±1 LSB maximum offset error, and ±1 LSB maximum gain error over temperature. These specifications ensure monotonic operation with no missed codes across the full 10-bit range - a critical requirement for closed-loop control and precision measurement applications where code consistency is essential.

Can the AD7477ARTZ-500RL7 operate from a 2.5 V supply?

Yes, the AD7477ARTZ-500RL7 is fully specified to operate from 2.7 V to 5.25 V, and the datasheet notes operational capability down to 2.0 V with adjusted logic thresholds (VINH ≥ 1.8 V). At 2.5 V, it remains functional with verified performance: typical IDD is 1.6 mA at 1 MSPS, power dissipation is ~4.0 mW, and DC accuracy remains within guaranteed limits - making it viable for ultra-low-voltage battery systems where nominal 2.7 V is not strictly maintained.