Analog Devices Inc. AD7277BRMZ

Overview

AD7277BRMZ 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 0.1 μA typical power-down current-designed for high-speed sensor signal digitization in industrial data acquisition systems.

For engineers reviewing the AD7277BRMZ datasheet, AD7277BRMZ pinout, AD7277BRMZ application, or AD7277BRMZ equivalent, key selection criteria include its 10-bit resolution with guaranteed no missing codes, SPI-compatible serial interface with no pipeline delay, and operation across −40°C to +125°C for harsh-environment embedded measurement.

Technical Context

The AD7277BRMZ uses a track-and-hold amplifier with 60 ns acquisition time and internal VDD-referenced conversion, enabling 0 V to VDD analog input range. Its conversion is initiated by CS falling edge and completed in 250 ns (12 SCLK cycles at 48 MHz), with data output MSB-first on SDATA synchronized to SCLK falling edges.

It supports flexible serial clock management: throughput scales directly with SCLK up to 48 MHz, and features three power modes-normal (3.5 mA typ at 3 V), partial power-down (34 μA), and full power-down (0.1 μA)-enabling dynamic power optimization in battery-sensitive or thermally constrained designs.

Key Specifications

Pinout & Package

AD7277BRMZ is housed in a 6-lead TSOT package (2.9 mm × 1.6 mm × 0.8 mm), optimized for space-constrained PCBs and thermal performance (θ_JA = 230°C/W). The package supports reflow soldering per JEDEC J-STD-020 (255°C peak).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7277BRMZ, AD7276BRMZ offers higher resolution at identical speed and package, while AD7477ARMZ trades speed and package size for lower power and cost-making AD7277BRMZ the optimal balance of throughput, precision, and miniaturization for space-limited high-speed measurement.

Availability

AD7277BRMZ is available at Aetrix Electronics and suitable for motor control, portable instrumentation, and industrial PLC analog input modules requiring stable component supply, long-term lifecycle support, and guaranteed −40°C to +125°C operation.

Supply support for AD7277BRMZ 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 compact, low-power, high-throughput data acquisition in industrial, automotive, and instrumentation systems-emphasizing rail-to-rail input, no-missing-codes assurance, and seamless microcontroller interfacing.

FAQ

What is the maximum sampling rate supported by the AD7277BRMZ?

The AD7277BRMZ achieves a maximum throughput rate of 3.45 MSPS when operated with a 48 MHz serial clock (SCLK). This corresponds to a minimum conversion time of 250 ns and requires 12 SCLK cycles per sample. At lower SCLK frequencies, throughput scales linearly-for example, 24 MHz yields ~1.7 MSPS. The device maintains specified AC performance (e.g., 60.5 dB SINAD) across its full rated speed range.

Does the AD7277BRMZ require an external voltage reference?

No, the AD7277BRMZ uses an internal reference derived from the VDD supply, enabling a full-scale analog input range of 0 V to VDD. This eliminates the need for an external reference IC or resistor divider, reducing BOM count and layout complexity. The internal reference is trimmed for accuracy, supporting the specified DC performance-including ±0.5 LSB integral nonlinearity-across the full −40°C to +125°C temperature range.

How does the AD7277BRMZ handle power management in battery-operated systems?

The AD7277BRMZ provides three distinct power states: normal mode (3.5 mA typ at 3 V), partial power-down (34 μA), and full power-down (0.1 μA typical). In full power-down, the device retains configuration and exits in <1 μs, allowing rapid wake-up for burst-mode sampling. This makes AD7277BRMZ highly suitable for energy-conscious applications like wireless sensor nodes, where average current can be reduced by >99% during idle periods without sacrificing acquisition speed on demand.

Is the AD7277BRMZ pin-compatible with other devices in the AD727x family?

Yes, the AD7277BRMZ is pin-compatible with AD7276BRMZ and AD7278BRMZ in the 6-lead TSOT package-sharing identical pinout (VDD, GND, VIN, SCLK, SDATA, CS) and electrical interface. This allows hardware reuse across 12-bit, 10-bit, and 8-bit variants. However, data frame format differs: AD7277BRMZ outputs two leading zeros + 10 bits + four trailing zeros, whereas AD7276BRMZ outputs two leading zeros + 12 bits + two trailing zeros-requiring minor firmware adjustment for bit alignment.

What serial interface protocols does the AD7277BRMZ support?

The AD7277BRMZ supports SPI, QSPI, MICROWIRE, and DSP-compatible serial interfaces through its CS, SCLK, and SDATA pins. It operates in standard SPI Mode 0 (CPOL = 0, CPHA = 0): data is sampled on the falling edge of SCLK, and CS falling edge initiates conversion and frames the data transfer. No additional mode pins or configuration registers are needed-the interface is fixed and hardware-transparent, enabling plug-and-play integration with most modern microcontrollers and DSPs.