Analog Devices Inc. AD977CRRL

Overview

AD977CRRL from Analog Devices is a 16-bit, 100 kSPS successive-approximation analog-to-digital converter (ADC) operating from a single 5 V supply. It features factory-calibrated linearity, on-chip 2.5 V reference, high-speed serial interface, and supports ±10 V, ±5 V, and 0 V–5 V input ranges - deployed in precision industrial data acquisition systems requiring stable dc accuracy and low power.

For engineers reviewing the AD977CRRL datasheet, AD977CRRL pinout, AD977CRRL application, or AD977CRRL equivalent, key selection considerations include throughput rate (100 kSPS), unipolar/bipolar input flexibility, internal vs. external reference support, power-down mode (50 µW), and SOIC-20 package compatibility with legacy industrial signal chains.

Technical Context

The AD977CRRL implements a switched-capacitor SAR architecture with integrated reference buffer and serial output stage. Its conversion control relies on dual digital inputs (R/C and CS), supporting both internal clock generation and external DATACLK synchronization via the EXT/INT pin.

It delivers guaranteed 15-bit no-missing-codes performance across all grades, with differential nonlinearity ≤±2 LSB and integral nonlinearity ≤±3 LSB. Aperture delay is fixed at 40 ns, and full-scale step transient response settles within 2 µs - enabling accurate sampling of slowly varying process signals.

Key Specifications

Pinout & Package

AD977CRRL is housed in a 20-lead Skinny SOIC (SOIC-20) package with standard JEDEC MS-013AC footprint and 0.025" lead pitch.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit SAR ADC applications.

Compared with AD7606BSTZ and ADS8860IDRCT, the AD977CRRL uniquely balances single-channel 16-bit precision, 5 V compatibility, internal reference, and SOIC-20 manufacturability - making it optimal for retrofitting or upgrading existing industrial signal conditioning boards without layout redesign.

Availability

AD977CRRL is available at Aetrix Electronics and suitable for process control systems, automated test equipment, and industrial data loggers requiring stable component supply, long-lifecycle support, and proven field reliability in harsh environments.

Supply support for AD977CRRL 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 industrial, automotive, communications, and healthcare markets since 1965.

The AD977CRRL belongs to Analog Devices' precision SAR ADC product line, designed specifically for industrial instrumentation and control applications demanding high dc accuracy, low power, and robust operation over –40°C to +85°C.

FAQ

What is the maximum sampling rate supported by the AD977CRRL?

The AD977CRRL supports a maximum throughput rate of 100 kSPS, corresponding to a minimum complete conversion cycle time of 10 µs. This is confirmed in Table 1 of the Rev. E datasheet under AD977 specifications. The AD977CRRL is the 100 kSPS variant - distinct from the AD977A (200 kSPS). Timing parameters t6 and t7 in Table 4 further validate this 10 µs total throughput time.

Does the AD977CRRL require an external reference voltage?

No, the AD977CRRL does not require an external reference voltage. It integrates a factory-trimmed 2.5 V reference with ±2 mV typical accuracy and ±2 ppm/°C drift. The REF pin can either output this internal reference or accept an external 2.3 V–2.7 V source - providing design flexibility without mandatory external components. This is specified in Table 1 and Figure 1 of the AD977/AD977A datasheet.

Which package type is used by the AD977CRRL?

The AD977CRRL uses a 20-lead Skinny SOIC (SOIC-20) package, designated "R" in Analog Devices' ordering guide. This is explicitly stated in the Features section ("20-Lead Skinny SOIC Package") and confirmed in Figure 3 and Table 6 of the Rev. E datasheet. It is not offered in SSOP or other variants under the CRRL suffix.

Can the AD977CRRL operate with unipolar and bipolar input ranges?

Yes, the AD977CRRL supports both unipolar (0 V–10 V, 0 V–5 V, 0 V–4 V) and bipolar (±10 V, ±5 V, ±3.3 V) input ranges. Selection is achieved via external resistor configurations on R1IN/R2IN/R3IN pins as detailed in Table 8 and Figures 14–16 of the datasheet. Input impedance and sampling capacitance (40 pF) remain consistent across all ranges.

How does the power-down mode function on the AD977CRRL?

When the PWRD pin is driven HIGH, the AD977CRRL enters power-down mode, reducing supply current to 50 µW while preserving the last conversion result in its output shift register. Conversion is inhibited, but the stored 16-bit value remains accessible via serial interface. Recovery to full accuracy takes 1 ms after PWRD returns LOW, as verified in Table 1's "Recovery to Rated Accuracy After Power-Down" parameter.