Analog Devices Inc. AD7477AARMZ-REEL7

Overview

AD7477AARMZ-REEL7 from Analog Devices is a 10-bit, 1 MSPS successive-approximation ADC in a 6-lead SC70 package, operating from 2.35 V to 5.25 V supply. It features 71 dB SNR at 100 kHz input, ±0.5 LSB integral nonlinearity, and 250 ns track-and-hold acquisition time-enabling high-fidelity signal digitization in space-constrained battery-powered instrumentation.

For engineers reviewing the AD7477AARMZ-REEL7 datasheet, AD7477AARMZ-REEL7 pinout, AD7477AARMZ-REEL7 application, or AD7477AARMZ-REEL7 equivalent, key selection considerations include its 10-bit resolution with guaranteed no missing codes, SPI/QSPI/MICROWIRE-compatible serial interface, 1 µA standby current, and internal VDD-referenced analog input range (0 V to VDD).

Technical Context

The AD7477AARMZ-REEL7 implements a standard successive-approximation register (SAR) architecture with a single-pole track-and-hold amplifier capable of handling >13 MHz full-power bandwidth. Conversion is initiated on the falling edge of CS, with no pipeline delay and deterministic timing governed by SCLK.

It uses VDD as the internal reference source, eliminating external reference components and fixing the analog input range to 0 V to VDD. Serial data output is MSB-first, with four leading zeros followed by 10 data bits and two trailing zeros, compatible with SPI, QSPI, MICROWIRE, and DSP interfaces.

Key Specifications

Pinout & Package

AD7477AARMZ-REEL7 is housed in a 6-lead SC70 package (2.0 mm × 1.25 mm × 0.9 mm), optimized for ultra-compact PCB layouts in handheld and wearable systems.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7477AARMZ-REEL7, AD7476AARMZ-REEL7 offers higher resolution at the cost of increased power, while ADS7822UIDRCT trades speed for significantly lower standby current and wider supply flexibility-making each suitable for distinct power-performance trade-offs in portable systems.

Availability

AD7477AARMZ-REEL7 is available at Aetrix Electronics and suitable for battery-powered systems, medical instruments, optical sensors, and mobile communications requiring stable component supply and long-term production continuity.

Supply support for AD7477AARMZ-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 AD7476A/AD7477A/AD7478A family was designed for space- and power-constrained data acquisition in portable and battery-operated systems, emphasizing integration, low standby current, and ease of microcontroller interfacing.

FAQ

What is the maximum sampling rate supported by the AD7477AARMZ-REEL7?

The AD7477AARMZ-REEL7 supports a maximum throughput rate of 1 MSPS under specified conditions (VDD = 2.35 V to 5.25 V, fSCLK = 20 MHz). Its conversion time is fixed at 14 SCLK cycles, so actual achievable rate depends on SCLK frequency-e.g., at 10 MHz SCLK, throughput drops to ~714 kSPS. The device guarantees 1 MSPS performance only when SCLK ≥ 20 MHz.

Does the AD7477AARMZ-REEL7 require an external voltage reference?

No, the AD7477AARMZ-REEL7 uses an internal reference derived from VDD, resulting in an analog input range of 0 V to VDD. This eliminates the need for external reference components, simplifying design and reducing bill-of-materials cost-though it means full-scale accuracy tracks VDD variations.

How does the serial data format of the AD7477AARMZ-REEL7 differ from the AD7476AARMZ-REEL7?

The AD7477AARMZ-REEL7 outputs 10-bit results as a 16-bit serial frame: four leading zeros, followed by 10 data bits (MSB first), then two trailing zeros. In contrast, the AD7476AARMZ-REEL7 outputs 12 data bits after four leading zeros (no trailing zeros), and the AD7478AARMZ-REEL7 appends four trailing zeros to its 8-bit result-ensuring consistent 16-bit framing across the family despite differing resolutions.

What is the guaranteed integral nonlinearity (INL) specification for the AD7477AARMZ-REEL7?

The AD7477AARMZ-REEL7 has a guaranteed integral nonlinearity of ±0.5 LSB maximum over temperature (−40°C to +85°C) and supply range (2.35 V to 5.25 V). This ensures monotonic behavior and predictable transfer function error, critical for closed-loop control and calibration-sensitive applications.

Can the AD7477AARMZ-REEL7 operate from a 1.8 V supply?

No-the AD7477AARMZ-REEL7 specifies a minimum supply voltage of 2.35 V. While some logic inputs (e.g., CS, SCLK) tolerate 1.8 V high-level thresholds when VDD ≥ 2.35 V, the core ADC circuitry requires ≥2.35 V to meet all AC and DC specifications. Operation below this violates absolute maximum ratings and invalidates performance guarantees.