Analog Devices Inc. AD7327TRUZ-EP

Overview

AD7327TRUZ-EP from Analog Devices is a radiation-hardened, 8-channel, 12-bit plus sign successive approximation register (SAR) ADC with true bipolar input capability, 500 kSPS throughput, software-selectable input ranges (±10 V, ±5 V, ±2.5 V, 0 V to +10 V), and integrated 2.5 V reference - designed for high-reliability data acquisition in defense, aerospace, and industrial systems operating from −55°C to +125°C.

For engineers reviewing the AD7327TRUZ-EP datasheet, AD7327TRUZ-EP pinout, AD7327TRUZ-EP application, or AD7327TRUZ-EP equivalent, key selection considerations include its iCMOS® process enabling 33 V total supply swing, channel sequencer for automated multi-channel sampling, SPI-/QSPI-/DSP-/MICROWIRE™-compatible serial interface, and military-grade temperature performance with controlled manufacturing baseline.

Technical Context

The AD7327TRUZ-EP implements a 13-bit SAR architecture with internal track-and-hold, supporting single-ended, true differential, and pseudo-differential input configurations per channel. Its iCMOS® process enables simultaneous high-voltage analog operation (±16.5 V supplies) and low-voltage digital logic (2.7 V to 5.25 V).

Input range selection is performed via on-chip range registers, allowing independent programming of each of the eight VINx inputs. The device integrates a temperature indicator, supports external reference operation up to 3.0 V, and features autostandby/autoshutdown power modes with sub-µA quiescent current.

Key Specifications

Pinout & Package

AD7327TRUZ-EP is housed in a 20-lead TSSOP (RU-20) package compliant with JEDEC MO-153-AC, with 0.65 mm pitch and 6.4 mm × 4.4 mm footprint - optimized for high-density PCB layouts in ruggedized modules.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage, multi-channel SAR ADC applications.

Compared with AD7606C-18 and ADS8688IPWR, AD7327TRUZ-EP uniquely combines military-grade temperature range, per-channel software-selectable bipolar ranges, and iCMOS® high-voltage integration - making it the only option qualified for embedded flight-critical data acquisition where range agility and extended cold-start operation are mandatory.

Availability

AD7327TRUZ-EP is available at Aetrix Electronics and suitable for defense electronics, avionics health monitoring, and high-reliability industrial power systems requiring stable component supply across extended product lifecycles.

Supply support for AD7327TRUZ-EP 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, serving precision instrumentation, communications, and aerospace markets since 1965.

The AD7327-EP product line delivers radiation-hardened, extended-temperature SAR ADCs for mission-critical data acquisition where reliability, bipolar input flexibility, and supply voltage robustness are non-negotiable design requirements.

FAQ

What is the maximum analog input voltage range supported by the AD7327TRUZ-EP?

The AD7327TRUZ-EP supports software-selectable input ranges of ±10 V, ±5 V, ±2.5 V, and 0 V to +10 V per channel. With an external 3.0 V reference applied to REFIN/OUT and minimum ±12 V supplies (VDD ≥ +12 V, VSS ≤ −12 V), the AD7327TRUZ-EP can accept true bipolar ±12 V analog inputs - verified in Table 1 under "Input Voltage Ranges" with VDD = +10 V min and VSS = −10 V min conditions.

Does the AD7327TRUZ-EP require external decoupling capacitors, and if so, where?

Yes, the AD7327TRUZ-EP requires external decoupling: a 680 nF capacitor must be placed on the REFIN/OUT pin per Figure 3 and Table 4 description; VCC must be decoupled to AGND; and VDRIVE must be decoupled to DGND. These are mandatory per the "Reference" and "Pin Function Descriptions" sections to maintain 2.5 V reference stability and prevent digital noise coupling into analog circuitry.

How does the AD7327TRUZ-EP handle channel sequencing and automatic sampling?

The AD7327TRUZ-EP includes a hardware channel sequencer that automatically cycles through all eight analog inputs in round-robin fashion when enabled via control register bits. This eliminates host processor intervention between conversions, enabling deterministic 500 kSPS aggregate throughput across channels - confirmed in the "General Description" and "Product Highlights" sections.

Is the AD7327TRUZ-EP compatible with standard SPI interfaces?

Yes, the AD7327TRUZ-EP features a SPI®-/QSPI™-/DSP-/MICROWIRE™-compatible serial interface with CS, SCLK, DIN, and DOUT pins. It operates with standard SPI timing (CPOL = 0, CPHA = 0), supports 16-bit read/write transfers, and tolerates SCLK up to 10 MHz - explicitly stated in "Product Highlights" and validated in Figure 2 timing diagram.

What power-saving modes does the AD7327TRUZ-EP offer, and what are their current draws?

The AD7327TRUZ-EP offers autostandby, autoshutdown, and full shutdown modes. In autostandby (250 kSPS), IDD/ISS draw 100/110 µA; in autoshutdown (static), IDD/ISS drop to 1 µA; full shutdown draws 1 µA on all supplies - values confirmed in Table 1 "POWER REQUIREMENTS" section under "Autostandby Mode", "Autoshutdown Mode", and "Full Shutdown Mode" rows.