Analog Devices Inc. AD7277AUJZ-RL7

Overview

AD7277AUJZ-RL7 from Analog Devices is a 10-bit, 3.45 MSPS successive approximation ADC in a 6-lead TSOT package, operating from 2.35 V to 3.6 V supply. It delivers 60.5 dB SINAD at 1 MHz input, 74 MHz full-power bandwidth, and 0.5 LSB typical DNL - enabling high-fidelity signal acquisition in space-constrained industrial sensor interfaces and portable instrumentation.

For engineers reviewing the AD7277AUJZ-RL7 datasheet, AD7277AUJZ-RL7 pinout, AD7277AUJZ-RL7 application, or AD7277AUJZ-RL7 equivalent, this page provides verified technical context, real-world design meaning for key specs, validated pin functions, application-specific implementation value, and two confirmed alternative parts with documented functional and application-level differences.

Technical Context

The AD7277AUJZ-RL7 implements a track-and-hold amplifier with 60 ns acquisition time and no pipeline delay, sampling on the falling edge of CS and completing conversion in 250 ns (12 SCLK cycles at 48 MHz). Its internal VDD-referenced architecture sets the analog input range to 0 V to VDD, eliminating external reference components.

It uses SPI-/QSPI-/MICROWIRE-/DSP-compatible serial interface with MSB-first output format: two leading zeros, 10 data bits, and four trailing zeros. Power management includes partial and full power-down modes drawing 34 μA and 0.1 μA (typ), respectively, supporting battery-sensitive designs.

Key Specifications

Pinout & Package

AD7277AUJZ-RL7 is housed in a 6-lead TSOT (Thin Small Outline Transistor) package measuring 1.5 mm × 1.5 mm × 0.55 mm, optimized for PCB area reduction and thermal performance (θJA = 230°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7277AUJZ-RL7, AD7477ARTZ-REEL7 trades extended temperature capability and speed for lower unit cost, while ADS7822U prioritizes resolution over sampling rate and integration - making AD7277AUJZ-RL7 optimal for compact, high-throughput, wide-temperature embedded sensing.

Availability

AD7277AUJZ-RL7 is available at Aetrix Electronics and suitable for industrial motor control, portable medical instrumentation, automotive cabin sensing, and process monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AD7277AUJZ-RL7 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 AD727x family was designed specifically for space-constrained, high-speed data acquisition systems requiring low power, wide bandwidth, and seamless microcontroller integration - targeting industrial, automotive, and medical edge-sensing applications.

FAQ

What is the maximum sampling rate supported by the AD7277AUJZ-RL7?

The AD7277AUJZ-RL7 achieves a maximum throughput rate of 3.45 MSPS when operated with a 48 MHz SCLK and VDD between 2.35 V and 3.6 V. This corresponds to a minimum conversion time of 250 ns using 12 SCLK cycles. At lower clock frequencies or reduced supply voltages, the rate scales linearly - e.g., 16 MHz SCLK yields ~1 MSPS. The AD7277AUJZ-RL7 datasheet specifies this as the absolute maximum guaranteed rate under B-grade conditions.

Does the AD7277AUJZ-RL7 require an external voltage reference?

No, the AD7277AUJZ-RL7 uses an internal reference derived from VDD, setting the full-scale analog input range to 0 V to VDD. This eliminates the need for external reference ICs or resistor dividers, reducing BOM count and layout complexity. The reference accuracy is tied to VDD regulation quality - for best INL performance, VDD should be stable within ±1% and low-noise, especially at high input frequencies.

How does the AD7277AUJZ-RL7 handle power-down modes?

The AD7277AUJZ-RL7 offers two power-down states: partial power-down (34 μA typical) and full power-down (0.1 μA typical at −40°C to +85°C). Full power-down is entered by holding CS high and SCLK low for >100 ns; wake-up time is ≤1 μs. Both modes retain register state and require no reinitialization, making them ideal for burst-mode acquisition in battery-powered devices where the AD7277AUJZ-RL7 spends >99% of time in low-power state.

What is the analog input structure of the AD7277AUJZ-RL7?

The AD7277AUJZ-RL7 features a single-ended, rail-to-rail analog input (VIN) with 0 V to VDD range and 42 pF input capacitance in track mode. It contains an integrated track-and-hold amplifier with 60 ns acquisition time and 74 MHz full-power bandwidth. The input leakage is ±1 μA (−40°C to +85°C), rising to ±5.5 μA at 125°C - requiring low-source-impedance drivers (<100 Ω) for optimal settling and linearity.

Is the AD7277AUJZ-RL7 pin-compatible with other members of the AD727x family?

Yes, the AD7277AUJZ-RL7 shares identical 6-lead TSOT pinout with AD7276AUJZ-RL7 and AD7278AUJZ-RL7 - same VDD, GND, VIN, SCLK, SDATA, and CS assignments. However, output data framing differs: AD7277AUJZ-RL7 outputs two leading zeros + 10 data bits + four trailing zeros, whereas AD7276AUJZ-RL7 outputs 12 data bits and AD7278AUJZ-RL7 outputs 8 data bits. Firmware must decode based on selected resolution.