Texas Instruments ADS8887IDGSR

Overview

ADS8887IDGSR from Texas Instruments is an 18-bit, 100-kSPS, true-differential SAR analog-to-digital converter with SPI-compatible serial interface, 100 dB SNR, ±3.0 LSB max INL, and 0.7 mW power dissipation at full speed - deployed in precision instrumentation signal chains requiring high DC accuracy and low noise.

For engineers reviewing the ADS8887IDGSR datasheet, ADS8887IDGSR pinout, ADS8887IDGSR application, or ADS8887IDGSR equivalent, key selection considerations include its true-differential input range (–VREF to +VREF), wide common-mode voltage support (0 V to VREF), no-latency output architecture, and daisy-chain capability for multi-channel synchronized sampling.

Technical Context

The ADS8887IDGSR implements a charge-redistribution SAR architecture with integrated sample-and-hold, enabling unipolar true-differential conversion without external signal conditioning. Its internal clock drives conversion while SCLK handles only serial readout during acquisition phase.

It supports three digital interface modes - 3-wire CS, 4-wire CS, and daisy-chain - selected dynamically by DIN level at CONVST rising edge. The device features a dedicated common-mode voltage detection and rejection block, allowing VCM anywhere from 0 V to VREF without performance degradation.

Key Specifications

Pinout & Package

ADS8887IDGSR is packaged in a 10-pin VSSOP (DGS) with exposed thermal pad. This RoHS-compliant package measures 3.0 mm × 3.0 mm × 1.0 mm and requires PCB thermal pad connection to GND for optimal thermal performance and EMI suppression.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8887IDGSR, ADS8867IDRCT trades 2 bits of resolution and 6 dB SNR for lower cost and identical footprint, while ADS8885IPWR delivers 4× higher throughput at the expense of 2.5× higher power and larger package - making ADS8887IDGSR optimal for space-constrained, battery-powered 18-bit precision applications.

Availability

ADS8887IDGSR is available at Aetrix Electronics and suitable for industrial process monitoring, precision medical instrumentation, and low-power battery-operated test equipment requiring stable component supply and long-term production continuity.

Supply support for ADS8887IDGSR 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 and embedded processing technologies, with decades of expertise in precision data converters and industrial-grade IC design.

The ADS8887IDGSR belongs to TI's 18-bit SAR ADC family engineered for high-accuracy, low-power, and true-differential signal acquisition in demanding instrumentation, medical, and test equipment applications.

FAQ

What is the absolute maximum input voltage range for AINP and AINN on the ADS8887IDGSR?

The absolute maximum voltage at AINP or AINN is –0.3 V to (REF + 0.3 V). Operation beyond this range risks ESD diode conduction and potential damage. Within specification, the functional input range is –0.1 V to (VREF + 0.1 V) for both pins, supporting true-differential spans from –VREF to +VREF. Always ensure external protection circuits respect these limits for reliable ADS8887IDGSR operation.

Does the ADS8887IDGSR require an external clock source for conversion?

No - the ADS8887IDGSR uses an internal clock for conversion timing and does not require an external master clock. The SCLK signal is used exclusively for serial data readout during the acquisition phase. Conversion duration (tconv) is bounded between 500 ns and 8800 ns, and the device automatically enters power-down mode after conversion completion - a key feature of the ADS8887IDGSR's low-power architecture.

Can the ADS8887IDGSR operate with different supply voltages on AVDD and DVDD?

Yes - AVDD (2.7–3.6 V) and DVDD (1.65–3.6 V) are independently specified and may be set to different voltages. This allows optimization of analog noise performance (via lower AVDD ripple) and digital interface compatibility (e.g., interfacing with 1.8-V or 3.3-V microcontrollers). Both supplies must be decoupled locally with 1-µF capacitors to GND, as defined in the ADS8887IDGSR datasheet.

How does the common-mode voltage (VCM) affect the full-scale input range of the ADS8887IDGSR?

VCM directly determines the usable differential input span: at VCM = VREF/2, full-scale range is –VREF to +VREF; if VCM < VREF/2, range compresses to –2×VCM to +2×VCM. This behavior is explicitly defined in Table 4 of the ADS8887IDGSR datasheet. The device's unique common-mode rejection block maintains ≥90 dB CMRR across the entire 0 V to VREF VCM range - a distinguishing feature of the ADS8887IDGSR versus conventional SAR ADCs.

Is the ADS8887IDGSR pin-compatible with other devices in the ADS88xx family?

The ADS8887IDGSR shares the same 10-pin VSSOP (DGS) footprint and pin assignments with ADS8867IDGSR and ADS8866IDGSR, but differs electrically in resolution, INL, and reference drive requirements. While mechanical layout is compatible, substituting ADS8887IDGSR for a 16-bit variant requires validation of signal chain noise, reference stability, and software bit-depth handling - confirming functional equivalence is not guaranteed solely by pinout match for the ADS8887IDGSR.