Texas Instruments ADS8507IBDWG4

Overview

ADS8507IBDWG4 from Texas Instruments is a 16-bit, 40-kSPS successive approximation register (SAR) analog-to-digital converter with integrated 2.5-V reference, parallel/serial interface, ±10 V input range support, and industrial −40°C to +85°C operation. It delivers 89.9-dB SINAD at 10 kHz, ±1.5 LSB max INL, and 24 mW typical power dissipation at full rate-used in precision data acquisition for industrial process control and test equipment.

For engineers reviewing the ADS8507IBDWG4 datasheet, ADS8507IBDWG4 pinout, ADS8507IBDWG4 application, or ADS8507IBDWG4 equivalent, key selection considerations include its dual parallel/serial interface flexibility, internal reference accuracy (±0.2% FSR), bipolar zero error (±5 mV), 28-pin SOIC package, and compatibility with ±25 V overvoltage-tolerant analog inputs without damage.

Technical Context

The ADS8507IBDWG4 implements a capacitor-based SAR architecture with integrated sample-and-hold, clock generation, and configurable data output coding (2's complement or straight binary). Its dual-mode interface supports either internal clock-driven serial output (with TAG daisy-chain) or full 16-bit parallel access via BYTE-selectable 8-bit nibbles.

It features programmable reference sourcing (internal 2.5 V or external 2.3–2.7 V), selectable unipolar/bipolar input ranges (±10 V, 0–5 V, 0–4 V), and independent digital/analog supplies (VDIG ≤ VANA = 4.75–5.25 V). Power-down mode reduces consumption to 50 µW while retaining previous conversion data.

Key Specifications

Pinout & Package

ADS8507IBDWG4 is housed in a 28-pin SOIC (SO-28, DW package) with standard 0.3-inch body width and 1.27-mm pitch. Pin 1 is marked by a beveled corner or dot; thermal resistance Θ_JA = 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 ADS8507IBDWG4, ADS8505IPW offers higher sampling rate but sacrifices integrated reference and overvoltage resilience, while ADS8326IBDBR trades parallel interface and ruggedness for compact size and speed-making ADS8507IBDWG4 optimal for industrial DAQ where reliability, ease of calibration, and interface flexibility are prioritized.

Availability

ADS8507IBDWG4 is available at Aetrix Electronics and suitable for industrial process control, test equipment, medical data acquisition, and digital signal processing front-end applications requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for ADS8507IBDWG4 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.

The ADS8507IBDWG4 belongs to TI's precision data acquisition portfolio, designed specifically for high-accuracy, low-power, multi-range industrial and medical analog front-ends where robustness, integrated reference, and dual-interface flexibility are essential.

FAQ

What input voltage ranges does the ADS8507IBDWG4 support?

The ADS8507IBDWG4 supports ±10 V, 0–5 V, and 0–4 V input ranges via external resistor networks per Figure 42/43 in the datasheet. Each range configures distinct input impedances (45.7 kΩ, 20.0 kΩ, 21.4 kΩ respectively), and all tolerate ±25 V on R1IN/R2IN without damage. The ADS8507IBDWG4 achieves ±1.5 LSB INL across these ranges using its internal 2.5-V reference or an external 2.3–2.7-V source.

Does the ADS8507IBDWG4 require an external reference?

No-the ADS8507IBDWG4 includes a factory-trimmed 2.5-V internal reference with ±0.2% full-scale accuracy and 8 ppm/°C drift. REF and CAP pins must be bypassed with a 2.2-µF tantalum capacitor. External reference mode is optional: drive REF with 2.3–2.7 V and assert REFD high to disable the internal source. The ADS8507IBDWG4 maintains specified linearity only when using either the internal reference or a compliant external source.

How does the parallel interface of the ADS8507IBDWG4 operate?

The ADS8507IBDWG4 provides full 16-bit parallel output via D0–D7 pins with BYTE pin controlling nibble selection: BYTE low outputs MSBs (D7–D0 = bits 15–8), BYTE high outputs LSBs (D7–D0 = bits 7–0). Data becomes valid after BUSY rises post-conversion. CS low + R/C high enables the bus; all other CS/R/C combinations tri-state outputs. The ADS8507IBDWG4 supports reading both bytes within one conversion cycle by toggling BYTE.

What is the purpose of the TAG pin on the ADS8507IBDWG4?

The TAG pin on the ADS8507IBDWG4 enables daisy-chain configuration in external clock (EXT/INT = high) serial mode. When CS is low and R/C is high, the level present on TAG at conversion start is output on SDATA after the 16-bit data stream ends. This allows cascading multiple ADS8507IBDWG4 devices on a shared SDATA line, with each device appending its own tag bit-simplifying synchronization in multi-channel acquisition systems without additional control lines.

Can the ADS8507IBDWG4 operate with separate analog and digital supplies?

Yes-the ADS8507IBDWG4 uses independent VANA (analog) and VDIG (digital) supplies, both rated 4.75–5.25 V, with VDIG required to be ≤ VANA. AGND1 and AGND2 serve as analog sense grounds; DGND is the digital ground. Proper separation-decoupling VANA with 0.1-µF ceramic + 10-µF tantalum, and tying VDIG directly to VANA-ensures 89.9-dB SINAD performance. The ADS8507IBDWG4 specifies 4.2 mA analog and 0.6 mA digital supply currents at 40 kSPS.