Texas Instruments ADS8507IBDW

Overview

ADS8507IBDW 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, ±10-V input range support, and industrial -40°C to +85°C operation. It integrates sample-and-hold, clock, reference buffer, and dual-mode data interface for precision data acquisition in process control and test equipment.

For engineers reviewing the ADS8507IBDW datasheet, ADS8507IBDW pinout, ADS8507IBDW application, or ADS8507IBDW equivalent, key selection criteria include its 16-bit resolution with ±1.5 LSB INL, 89.9-dB SINAD at 10 kHz, 24-mW typical power at full rate, SO-28 package, and configurable BTC/SB output coding - all verified across temperature and supply variations.

Technical Context

The ADS8507IBDW implements a capacitor-based SAR architecture with integrated track-and-hold, supporting simultaneous high-speed sampling and low-power operation. Its dual interface enables flexible system integration: parallel 16-bit output via BYTE-selectable 8-bit nibbles, and SPI-compatible serial output with TAG daisy-chain capability.

It features programmable input ranges (±10 V, 0–4 V, 0–5 V), internal or external 2.5-V reference selection, bipolar/unipolar zero-error trimming, and power-down mode consuming only 50 µW. The device tolerates ±25-V analog input overvoltage without damage and recovers in 750 ns after full-scale overvoltage events.

Key Specifications

Pinout & Package

ADS8507IBDW is housed in a 28-pin SOIC (SO-28, DW package) with standard 0.3-inch body width and 1.27-mm pitch. Thermal resistance Θ_JA is 46°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8505IPW and ADS8326IBDBT, the ADS8507IBDW uniquely combines ±10-V bipolar input capability, integrated 2.5-V reference, 40-kSPS throughput, and ±25-V overvoltage protection - making it the only option among the three qualified for ruggedized industrial analog front-ends requiring both precision and fault resilience.

Availability

ADS8507IBDW is available at Aetrix Electronics and suitable for industrial process control, automated test equipment, and medical data acquisition systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for ADS8507IBDW 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 ADS8507IBDW belongs to TI's precision data acquisition portfolio, designed specifically for high-accuracy, low-power, and robust industrial sensing applications where input flexibility, reference integration, and fault tolerance are critical.

FAQ

What input voltage ranges does the ADS8507IBDW support?

The ADS8507IBDW supports ±10 V, 0–4 V, and 0–5 V input ranges through external resistor networks per TI's Figure 42 and Figure 43. Each range is selected by connecting R1IN and R2IN to appropriate nodes (VIN, AGND, or CAP) with specified series resistors. The device tolerates ±25 V on either input without damage, ensuring robustness in noisy industrial environments. This configurability makes ADS8507IBDW suitable for diverse sensor interfaces without external signal conditioning.

Does the ADS8507IBDW require an external reference?

No, the ADS8507IBDW includes an internal 2.5-V reference with ±0.1% initial accuracy (2.48–2.52 V) and ≤8 ppm/°C drift. It can operate fully autonomously using this reference. However, the REFD pin allows disabling the internal reference to accommodate an external 2.3–2.7-V reference for higher precision or system-level reference synchronization. When using the internal reference, a 2.2-µF tantalum capacitor must be placed on the CAP pin to AGND2 for stability - a requirement explicitly defined in the ADS8507IBDW datasheet.

How does the parallel/serial interface work on the ADS8507IBDW?

The ADS8507IBDW offers dual interface modes: parallel 16-bit output via D0–D7 pins with BYTE select for MSB/LSB nibbles, and SPI-compatible serial output via SDATA/DATACLK with TAG daisy-chain support. Interface mode is selected using the EXT/INT pin: high enables internal clocking and parallel-only operation; low enables external clock-synchronized serial output. The SB/BTC pin configures output coding (2's complement or straight binary), and R/C/CS timing controls conversion initiation and data validity - all functions rigorously documented for ADS8507IBDW in SLAS381.

What is the power consumption profile of the ADS8507IBDW?

The ADS8507IBDW consumes 24 mW typical (30 mW max) at 40 kSPS with VANA = VDIG = 5 V, and drops to 50 µW max in power-down mode (PWRD = high). Analog and digital supplies draw 4.2 mA and 0.6 mA respectively under full-rate operation. Power supply sensitivity is ±8 LSB over ±250 mV supply variation, confirming stable performance across rail tolerances. These values are measured and guaranteed for ADS8507IBDW across –40°C to +85°C, enabling predictable thermal design in compact enclosures.

Is the ADS8507IBDW pin-compatible with other TI ADCs?

Yes, the ADS8507IBDW is pin-compatible with the ADS7807 (16-bit) and ADS7806/ADS8506 (12-bit) families in the same SO-28 (DW) package, sharing identical pin assignments for power, ground, analog inputs, reference, and core digital control signals. This allows direct upgrade paths from 12-bit to 16-bit resolution without PCB redesign. However, users must verify interface timing and reference configuration compatibility - for example, ADS7806 lacks internal reference and requires external buffering - as confirmed in the ADS8507IBDW datasheet's "Pin-Compatible With" feature statement.