Analog Devices Inc. AD7949SCPZ-EP-R2

Overview

AD7949SCPZ-EP-R2 from Analog Devices is a radiation-hardened, 14-bit, 8-channel successive approximation register (SAR) analog-to-digital converter optimized for multichannel data acquisition in extreme environments. It delivers 250 kSPS throughput, ±0.5 LSB INL, 85 dB SINAD at 20 kHz, and operates across −55°C to +125°C with single 2.3 V to 5.5 V supply. It is deployed in aerospace telemetry systems requiring high-resolution, low-latency conversion under thermal and radiation stress.

For engineers reviewing the AD7949SCPZ-EP-R2 datasheet, AD7949SCPZ-EP-R2 pinout, AD7949SCPZ-EP-R2 application, or AD7949SCPZ-EP-R2 equivalent, key selection considerations include its military-grade temperature range, internal selectable 2.5 V/4.096 V reference, SPI-compatible serial interface, channel sequencer with one-pole filter, and integrated temperature sensor - all in a 4 mm × 4 mm LFCSP package.

Technical Context

The AD7949SCPZ-EP-R2 implements a charge redistribution SAR architecture with no pipeline delay, enabling deterministic latency and true 14-bit resolution without missing codes. Its 8-channel multiplexer supports unipolar single-ended, differential (GND-sense), and pseudobipolar configurations, with channel-to-channel crosstalk of −125 dB at 100 kHz.

It integrates an internal bandgap reference (2.5 V or 4.096 V), buffered REFIN input path, on-chip temperature sensor (283 mV at 25°C, 1 mV/°C), and programmable sequencer with busy indicator. The dual-supply design separates analog VDD (2.3–5.5 V) from digital VIO (1.8–VDD), supporting mixed-voltage host interfaces while maintaining 50 nA standby current.

Key Specifications

Pinout & Package

AD7949SCPZ-EP-R2 is housed in a 20-lead Lead Frame Chip Scale Package (LFCSP), 4 mm × 4 mm body, 0.75 mm height, JEDEC MO-220-WGGD-11 compliant. The exposed pad (EPAD) is not electrically connected but must be soldered to the system ground plane for mechanical reliability and thermal performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar multichannel SAR ADC applications.

Compared with AD7949SCPZ-EP-R2, AD7689BRMZ-RL7 trades integration for resolution and AD7946BCPZ-RL7 trades channel count for precision - neither provides the same combination of 14-bit accuracy, 8-channel flexibility, internal reference, temperature sensing, and military-grade reliability in a single 4 mm × 4 mm package.

Availability

AD7949SCPZ-EP-R2 is available at Aetrix Electronics and suitable for aerospace telemetry, seismic data acquisition, and medical instrumentation requiring stable component supply across extended temperature and radiation environments.

Supply support for AD7949SCPZ-EP-R2 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, serving industrial, automotive, communications, and defense markets since 1965.

The AD7949-EP product line delivers enhanced reliability, extended temperature operation, and rigorous process controls for mission-critical data acquisition in defense, aerospace, and harsh-environment industrial systems.

FAQ

What is the maximum sample rate of the AD7949SCPZ-EP-R2 under full-spec conditions?

The AD7949SCPZ-EP-R2 achieves 250 kSPS maximum throughput when VDD is between 4.5 V and 5.5 V, with all specifications guaranteed over the full −55°C to +125°C temperature range. At lower VDD (2.3 V to 4.5 V), the maximum rate drops to 200 kSPS. This rate is sustained without pipeline delay due to its SAR architecture, making it suitable for time-critical applications such as real-time power quality analysis.

Does the AD7949SCPZ-EP-R2 support differential input configurations?

Yes, the AD7949SCPZ-EP-R2 supports true differential input modes using its 8-channel multiplexer and COM pin. In differential mode, any pair of channels (e.g., IN0 and IN1) can be configured relative to COM set at VREF/2, providing 14-bit resolution with −125 dB channel-to-channel crosstalk at 100 kHz. This capability is confirmed in the functional block diagram and Table 2 specifications for analog input CMRR and absolute input voltage limits.

Can the internal temperature sensor in the AD7949SCPZ-EP-R2 be used for system-level calibration?

Yes, the AD7949SCPZ-EP-R2 includes an internal temperature sensor whose output (283 mV at 25°C, 1 mV/°C) appears on a dedicated multiplexer input. It is explicitly specified in Table 2 and Figure 1, and its output is digitized alongside analog channels. Engineers use this reading to compensate gain/offset drift in precision measurement chains - for example, correcting thermocouple amplifier errors in downhole oilfield tools operating across −55°C to +125°C.

What reference voltage options does the AD7949SCPZ-EP-R2 support, and how do they affect accuracy?

The AD7949SCPZ-EP-R2 supports three reference configurations: internal 2.5 V or 4.096 V (±10 ppm/°C drift), external buffered (up to 4.096 V), or direct external (0.5 V to VDD). Internal references provide best system-level accuracy with ±0.5 LSB INL and 85 dB SINAD at 5 V REF; external references introduce additional error sources but allow higher precision if a low-drift external REF is used. All options are validated in Table 2 and Figure 12.

Is the AD7949SCPZ-EP-R2 pin-compatible with commercial-grade AD7949 variants?

No, the AD7949SCPZ-EP-R2 is not pin-compatible with commercial AD7949 variants such as AD7949BCPZ-RL7. While both share identical pin numbering and LFCSP-20 packaging, the EP version includes enhanced process controls, different wafer lot traceability, and qualification testing per AQEC standards - but no physical pinout change. However, design reuse requires verification of thermal derating, radiation tolerance margins, and extended temperature validation per application requirements.