Texas Instruments ADS8507IDW

Overview

ADS8507IDW from Texas Instruments is a 16-bit, 40-kSPS successive approximation register (SAR) analog-to-digital converter with internal 2.5-V reference, parallel/serial interface, and ±10-V input range capability. It operates from a single 5-V supply, delivers 89.9-dB SINAD at 10 kHz, and supports industrial process control and data acquisition systems requiring high DC accuracy and low power.

For engineers reviewing the ADS8507IDW datasheet, ADS8507IDW pinout, ADS8507IDW application, or ADS8507IDW equivalent, key selection considerations include its ±1.5 LSB max INL, 24 mW typical power at 40 kSPS, SO-28 package, dual output format (2's complement or straight binary), and support for both internal and external reference configurations.

Technical Context

The ADS8507IDW integrates a capacitor-based SAR architecture with on-chip sample-and-hold, clock generation, and configurable reference path. Its dual-mode interface allows simultaneous use of parallel (BYTE-selectable 8-bit nibbles) and SPI-compatible serial (TAG-daisy-chain capable) outputs, synchronized via internal or external DATACLK.

It features programmable data coding (SB/BTC), bipolar/unipolar input range selection (±10 V, 0–4 V, 0–5 V), and robust overvoltage tolerance (±25 V on R1IN/R2IN). Power-down mode reduces consumption to 50 µW, and internal reference drift is specified at ±8 ppm/°C.

Key Specifications

Pinout & Package

ADS8507IDW is housed in a 28-pin SOIC (SO-28, DW package) with exposed pad not present. Pin functions are validated per TI SLAS381 datasheet Rev. December 2006, including dedicated analog/digital grounds (AGND1, AGND2, DGND), dual analog inputs (R1IN, R2IN), and dual-mode data interface (D0–D7, SDATA, DATACLK, BYTE).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8505IPW and ADS8686SIPBS, the ADS8507IDW offers optimal balance of integrated reference, ±10-V input capability, and low 24-mW power at 40 kSPS - making it ideal for cost-sensitive, space-constrained industrial DAQ where moderate speed suffices.

Availability

ADS8507IDW is available at Aetrix Electronics and suitable for industrial process control, test equipment, and medical data acquisition systems requiring stable component supply, long-lifecycle support, and guaranteed traceability.

Supply support for ADS8507IDW 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 high-reliability components for industrial, automotive, and communications markets.

The ADS8507IDW belongs to TI's precision data acquisition portfolio, designed specifically for high-accuracy, low-power, single-supply industrial and medical instrumentation applications requiring robustness and ease of integration.

FAQ

What input voltage ranges does the ADS8507IDW support?

The ADS8507IDW supports ±10 V, 0–4 V, and 0–5 V input ranges. Configuration is achieved using external resistor networks per TI SLAS381 Figure 42 and Figure 43. The device tolerates ±25 V on R1IN and R2IN without damage, enabling direct connection to industrial field signals without external protection circuitry. Input impedance varies by range: 45.7 kΩ for ±10 V, 20.0 kΩ for 0–5 V, and 21.4 kΩ for 0–4 V.

Does the ADS8507IDW require an external reference?

No, the ADS8507IDW includes an internal 2.5-V reference with ±0.02 V initial accuracy and ±8 ppm/°C drift. It can also accept an external 2.3–2.7-V reference via the REF pin when higher stability or system-level reference synchronization is needed. When using the internal reference, a 2.2-µF tantalum capacitor must be placed from CAP to AGND2.

How does the parallel/serial dual interface operate on the ADS8507IDW?

The ADS8507IDW supports simultaneous parallel and serial output. Parallel mode uses D0–D7 with BYTE pin to select MSB/LSB nibbles; serial mode uses SDATA and DATACLK with EXT/INT to choose internal or external clocking. In internal clock mode, 16 pulses appear on DATACLK after each conversion. TAG pin enables daisy-chaining multiple ADS8507IDW devices for synchronized sampling.

What is the power consumption profile of the ADS8507IDW?

The ADS8507IDW consumes 24 mW typical at 40 kSPS with VANA = VDIG = 5 V and internal reference enabled. In power-down mode (PWRD high), consumption drops to 50 µW maximum. Reference disable (REFD high) reduces analog supply current further. Total supply current is 4.2 mA analog + 0.6 mA digital at 40 kSPS, with thermal resistance ΘJA = 46 °C/W in SO-28 package.

Is the ADS8507IDW pin-compatible with other TI ADCs?

Yes, the ADS8507IDW is pin-compatible with the ADS7807 (16-bit) and ADS7806/8506 (12-bit) families in SO-28 package. This allows drop-in upgrades or design reuse across performance tiers. However, users must verify timing, reference configuration, and output format (SB/BTC) settings, as functional behavior differs - e.g., ADS8507IDW adds internal reference and enhanced overvoltage tolerance not present in earlier variants.