Analog Devices Inc. AD7356BRUZ-RL

Overview

AD7356BRUZ-RL from Analog Devices is a dual, 12-bit, successive approximation register (SAR) ADC with simultaneous sampling, 5 MSPS per channel throughput, differential input architecture, on-chip 2.048 V reference, and SPI-compatible serial interface - used in high-speed I/Q demodulation and motion control data acquisition.

For engineers reviewing the AD7356BRUZ-RL datasheet, AD7356BRUZ-RL pinout, AD7356BRUZ-RL application, or AD7356BRUZ-RL equivalent, key selection considerations include simultaneous dual-channel sampling timing, ±VREF/2 differential input range, 71.5 dB typical SINAD at 1 MHz, 16-lead TSSOP package thermal performance (θJA = 143°C/W), and full-power-down mode consuming only 90 μA at +125°C.

Technical Context

The AD7356BRUZ-RL integrates two independent SAR ADCs sharing a single 2.5 V VDD supply and separate analog/digital grounds (AGND/DGND/REFGND), each with dedicated track-and-hold amplifiers supporting >110 MHz full-power bandwidth. Conversion is initiated on the falling edge of CS, with no latency and deterministic timing governed by SCLK frequency (up to 80 MHz).

It employs capacitive DAC-based conversion with charge redistribution, uses straight binary output coding, and supports flexible reference configuration: internal 2.048 V ±0.25% reference (6 ppm/°C drift) or external overdrive from 2.148 V to VDD. Power management includes partial and full power-down modes controlled via serial interface.

Key Specifications

Pinout & Package

AD7356BRUZ-RL is housed in a 16-lead Thin Shrink Small Outline Package (TSSOP) with exposed pad, optimized for thermal dissipation (θJA = 143°C/W) and PCB space efficiency in high-density signal chain designs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel SAR ADC applications.

Compared with AD7357BRUZ and AD7352BRUZ, the AD7356BRUZ-RL uniquely delivers 12-bit accuracy at 5 MSPS with lowest power-per-MSPS (7.2 mW/MSPS), making it optimal for thermally constrained, high-throughput dual-channel acquisition where 14-bit resolution is unnecessary.

Availability

AD7356BRUZ-RL is available at Aetrix Electronics and suitable for motor control, RF demodulation, industrial motion systems, and high-speed data acquisition requiring stable component supply across extended temperature ranges.

Supply support for AD7356BRUZ-RL 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 semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision signal chain applications.

The AD7356BRUZ-RL belongs to Analog Devices' high-speed precision SAR ADC product line, engineered for simultaneous dual-channel acquisition in demanding industrial, automotive, and communications systems where timing alignment and low power are critical.

FAQ

What is the maximum input frequency supported by the AD7356BRUZ-RL?

The AD7356BRUZ-RL supports a full-power bandwidth of 110 MHz at −3 dB and 77 MHz at −0.1 dB, enabling accurate digitization of high-frequency analog signals such as IF outputs or fast transients. This performance is achieved through its low-noise, wide-bandwidth track-and-hold amplifiers preceding each SAR core, and is validated across the full −40°C to +125°C operating range. The AD7356BRUZ-RL maintains this bandwidth regardless of whether the internal 2.048 V reference or an external reference is used.

Does the AD7356BRUZ-RL require external decoupling capacitors, and if so, what values are recommended?

Yes, the AD7356BRUZ-RL requires specific external decoupling: a 0.1 µF ceramic capacitor in parallel with a 10 µF tantalum capacitor between VDD and AGND; identical decoupling between VDRIVE and DGND; and 10 µF capacitors between REFA/REFB and REFGND. These values are specified in the AD7356BRUZ-RL datasheet to ensure stable reference operation, minimize digital switching noise coupling, and maintain analog performance at 5 MSPS. Omitting or undersizing these capacitors degrades SNR and increases INL error.

Can the AD7356BRUZ-RL operate with an external reference, and what is the acceptable voltage range?

Yes, the AD7356BRUZ-RL supports external reference overdrive on REFA and REFB pins within 2.048 V + 100 mV (2.148 V) to VDD (max 2.75 V). When overdriven, the internal reference buffer is disabled, and the external source must drive ≤0.45 mA with low impedance (<1 Ω output impedance recommended). The AD7356BRUZ-RL retains full 12-bit linearity and timing specifications under external reference operation, as confirmed in Table 2 of the Rev. B datasheet.

How does the AD7356BRUZ-RL handle simultaneous readout of both ADC channels?

The AD7356BRUZ-RL provides simultaneous readout via two independent serial data outputs: SDATAA carries Channel A's 12-bit result and SDATAB carries Channel B's, both aligned to the same SCLK edges and prefixed with two leading zeros. Alternatively, holding CS low for 16 SCLK cycles reads one channel, then extending CS low for another 16 cycles retrieves the second channel on the same pin - enabling use with single-SPI-port controllers. This dual-output capability is intrinsic to the AD7356BRUZ-RL's hardware design and requires no configuration.

What is the power consumption of the AD7356BRUZ-RL in full power-down mode at maximum temperature?

In full power-down mode, the AD7356BRUZ-RL consumes 90 μA at +125°C, as specified in Table 2 of the Rev. B datasheet. This ultra-low quiescent current is achieved by disabling both ADC cores, reference buffer, and digital interface while retaining register state. Recovery time from full power-down to operational mode is 17 µs (typical), allowing rapid wake-up for burst-mode acquisition. At −40°C to +85°C, consumption drops to 5–40 μA, making the AD7356BRUZ-RL suitable for thermally aggressive, energy-conscious applications.