Analog Devices Inc. AD7980BCPZ-RL7

Overview

AD7980BCPZ-RL7 from Analog Devices is a 16-bit, 1 MSPS successive approximation register (SAR) analog-to-digital converter with pseudo-differential input, zero-latency architecture, ±1.25 LSB max INL, 91.5 dB SNR at 10 kHz, and operation from −40°C to +125°C - used in high-precision data acquisition for medical instruments and automated test equipment.

For engineers reviewing the AD7980BCPZ-RL7 datasheet, AD7980BCPZ-RL7 pinout, AD7980BCPZ-RL7 application, or AD7980BCPZ-RL7 equivalent, this page delivers verified electrical parameters, package mapping to 10-lead LFCSP, interface timing constraints, real-world performance trade-offs between VIO voltage and throughput, and validated alternative SAR ADCs for precision sampling systems.

Technical Context

The AD7980BCPZ-RL7 implements a single-supply, pseudo-differential SAR architecture with external reference (2.4 V–5.1 V), enabling flexible input scaling while maintaining 16-bit no-missing-codes resolution. Its zero-latency design eliminates pipeline delay, delivering conversion results immediately after CNV rising edge.

It supports SPI/QSPI/MICROWIRE/DSP-compatible serial interfaces with daisy-chain capability and optional busy indicator, using separate VIO (1.71 V–5.5 V) for logic-level compatibility across 1.8 V, 2.5 V, 3 V, and 5 V host systems - critical for mixed-voltage industrial and automotive signal chains.

Key Specifications

Pinout & Package

AD7980BCPZ-RL7 is housed in a 10-lead, 3 mm × 3 mm LFCSP (Lead Frame Chip Scale Package) with exposed pad connected to GND per datasheet recommendation. Thermal resistance θJA = 200°C/W (JEDEC 2S2P board).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7980BCPZ-RL7, AD7988-5BCPZ-RL7 trades half the throughput for 45% lower power and identical footprint, while AD7693BRMZ-RL7 sacrifices interface flexibility and external reference control for reduced BOM count and simpler power sequencing.

Availability

AD7980BCPZ-RL7 is available at Aetrix Electronics and suitable for medical instrumentation, automated test equipment, and machine automation requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for AD7980BCPZ-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 AD7980BCPZ-RL7 belongs to Analog Devices' PulSAR® family of precision SAR ADCs, engineered for high-speed, low-power, and wide-temperature data acquisition in demanding industrial and medical applications.

FAQ

What is the maximum operating temperature for AD7980BCPZ-RL7?

The AD7980BCPZ-RL7 is fully specified from −40°C to +125°C ambient temperature. This rating applies to both A-grade and B-grade versions and is validated per the Rev. G datasheet. Operation beyond +125°C is not guaranteed and may degrade INL, SNR, or reliability. The LFCSP package's θJA = 200°C/W requires careful PCB thermal design to maintain junction temperature below 150°C under full load.

Does AD7980BCPZ-RL7 require an external reference voltage?

Yes, AD7980BCPZ-RL7 requires an external reference voltage applied to the REF pin. The device accepts 2.4 V to 5.1 V, and performance metrics like SNR and INL are specified at VREF = 5 V. No internal reference is present - omitting the external reference will prevent proper conversion. A 10 µF capacitor must be placed directly at the REF pin for stability and noise suppression.

Can AD7980BCPZ-RL7 interface directly with a 1.8 V microcontroller?

Yes, AD7980BCPZ-RL7 supports 1.8 V logic levels via its dedicated VIO pin. When VIO = 1.8 V, digital inputs (CNV, SCK, SDI) accept VIH ≥ 1.62 V and VIL ≤ 0.18 V, and SDO outputs VOH ≥ 1.5 V and VOL ≤ 0.4 V - meeting standard 1.8 V CMOS thresholds. This eliminates level-shifters in mixed-voltage systems.

What is the purpose of the exposed pad on the AD7980BCPZ-RL7 LFCSP package?

The exposed pad on AD7980BCPZ-RL7 must be connected to GND per the datasheet (Figure 4 note). While not strictly required for basic electrical functionality, grounding the pad significantly improves thermal dissipation (reducing θJA), lowers ground impedance for analog sections, and enhances EMI immunity - especially critical at 1 MSPS switching rates and in noisy industrial environments.

How does throughput change with VIO voltage and temperature for AD7980BCPZ-RL7?

AD7980BCPZ-RL7 achieves 1 MSPS only when VIO ≥ 3.3 V and ambient temperature ≤ 85°C. At VIO < 3.3 V or TA > 85°C, throughput drops to 833 kSPS. This is due to internal timing margins tightening under voltage/temperature stress - Table 4 and Table 5 in Rev. G confirm these derating conditions. System designs must validate timing budgets accordingly.