Texas Instruments ADS8881CDRCR

Overview

ADS8881CDRCR from Texas Instruments is an 18-bit, 1-MSPS, true-differential SAR analog-to-digital converter with SPI-compatible serial interface, –VREF to +VREF input range, 90 dB minimum CMRR, and 100 dB SNR at 1 kHz. It operates from 2.7 V to 3.6 V AVDD/DVDD supplies and supports 2.5 V to 5 V independent external reference voltage - enabling precision data acquisition in low-power instrumentation and medical systems.

For engineers reviewing the ADS8881CDRCR datasheet, ADS8881CDRCR pinout, ADS8881CDRCR application, or ADS8881CDRCR equivalent, key selection criteria include its no-latency output, daisy-chain capability, 5.5 mW power dissipation at full speed, 50 nA power-down current, and VSON-10 (3 mm × 3 mm) package optimized for space-constrained high-resolution signal chains.

Technical Context

The ADS8881CDRCR implements a successive approximation register (SAR) architecture with true-differential analog inputs, supporting unipolar differential spans of –VREF to +VREF and common-mode voltages from 0 V to VREF. Its internal timing engine delivers 500 ns minimum conversion time and 290 ns full-scale step settling to 18-bit accuracy.

It features three configurable serial interface modes - 3-wire (CONVST as CS), 4-wire (DIN as CS), and daisy-chain - all SPI-compatible with up to 70 MHz SCLK and optional busy-indicator bit. Power consumption scales linearly with throughput: 5.5 mW at 1 MSPS, 0.55 mW at 100 kSPS, and 55 µW at 10 kSPS.

Key Specifications

Pinout & Package

VSON-10 (DRC) package: 3.00 mm × 3.00 mm body, exposed thermal pad (connected to GND), 0.5 mm pitch, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8881CDRCR, ADS8861IDRCT trades 2 bits of resolution and 4.5 dB SNR for lower cost and identical footprint, while AD7606C-18BSTZ provides channel count and integration at the expense of size, power, and interface complexity - making ADS8881CDRCR optimal for compact, single-channel, ultra-low-noise applications.

Availability

ADS8881CDRCR is available at Aetrix Electronics and suitable for automatic test equipment, precision medical instrumentation, and low-power portable measurement systems requiring stable component supply, long-term manufacturability, and TI's production-data qualified performance.

Supply support for ADS8881CDRCR 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

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies, with decades of expertise in precision data converters and industrial-grade reliability.

The ADS8881CDRCR belongs to TI's precision SAR ADC product line, engineered for high-resolution, low-power, and low-noise data acquisition in safety-critical and battery-constrained applications - emphasizing metrology-grade accuracy and robust serial interface flexibility.

FAQ

What is the operating temperature range for the ADS8881CDRCR?

The ADS8881CDRCR is rated for commercial temperature operation from 0°C to +70°C. This grade is specified with guaranteed performance for INL (±2.0 LSB max), DNL (±1.0 LSB max), and SNR (100 dB typ) across that full range, making it suitable for laboratory instruments and non-automotive industrial environments where ambient conditions remain controlled.

Does the ADS8881CDRCR require an external reference voltage?

Yes, the ADS8881CDRCR requires an external reference voltage applied to the REF pin. It accepts 2.5 V to 5 V, independent of AVDD and DVDD supplies. The reference must be decoupled with ≥10 µF capacitance to maintain 100 dB SNR; TI recommends low-noise references like REF5045 or REF2925 for optimal performance.

Can the ADS8881CDRCR interface with a 1.8-V microcontroller?

Yes - the DVDD supply is independent and supports 1.65 V to 3.6 V operation. When interfacing with a 1.8-V MCU, set DVDD = 1.8 V and ensure SCLK frequency remains below 40 MHz (per datasheet spec). Logic levels (VIH/VIL) and timing parameters (e.g., td-CK-DO) are fully characterized down to 1.65 V DVDD.

What package type does the ADS8881CDRCR use, and is thermal pad connection mandatory?

The ADS8881CDRCR uses the VSON-10 (DRC) package: 3.00 mm × 3.00 mm body with 0.5 mm pitch and an exposed thermal pad. TI explicitly recommends connecting the thermal pad to PCB ground for thermal relief (RθJB = 45.9°C/W) and improved noise immunity - omission degrades SNR and increases junction temperature under sustained 1-MSPS operation.

How does the daisy-chain mode function on the ADS8881CDRCR?

In daisy-chain mode, multiple ADS8881CDRCR devices share one SPI bus: DOUT of Device N connects to DIN of Device N+1. A single CONVST pulse initiates simultaneous conversions; results shift out sequentially on the shared DOUT line. This eliminates need for individual CS lines and simplifies firmware for multi-channel systems - confirmed in TI's SBAS547D Figure 3 and Section 8.8.