ADS8509HDB - 16-Bit 250kSPS SAR ADC, ±10V In | Texas Instruments
MPN: ADS8509HDB ✓ نشطADS8509HDB نظرة عامة
An SAR ADC is a type of data converter that performs a binary search across an internal capacitor-based DAC to resolve each analog sample in a single conversion cycle, making it ideal for multiplexed data-acquisition systems where low latency and deterministic behavior matter more than raw speed. The ADS8509 family extends this architecture with bipolar true-differential inputs, a 2.5 V internal reference, and a sample-and-hold front-end that simplifies signal-chain design by eliminating the need for an external front-end buffer or precision reference. It is part of the broader category of precision ADCs in the data-converter IC segment of power management and signal-chain semiconductors.
Key features include ±10 V, ±5 V, and ±3.3 V software-selectable input ranges (one resistor selects the range), a 2.5 V internal reference with optional external reference override, ±1.5 LSB maximum INL and ±1 LSB maximum DNL at the 16-bit level, and a serial data output that can be driven by either the internal conversion clock or an external data clock for system-clock synchronization. Power consumption is 75 mW typical from a single +5 V analog supply plus a +3 V to +5 V digital supply, with a hardware power-down (NAP) pin reducing quiescent current during idle windows.
The device uses CMOS capacitor-based charge-redistribution SAR logic with an inherent sample-and-hold on the input pins, eliminating the need for an external track-and-hold. The digital interface supports both internal-clock and external-clock data framing, and the SYNC/INPUTRANGE pin lets the host microcontroller reconfigure the analog input range on the fly without an external analog multiplexer.
Typical applications include industrial process-control PLC analog input modules, multi-channel data-acquisition (DAQ) boards, high-temperature down-hole drilling instruments, automatic test equipment (ATE) digitizer channels, and precision weigh-scale and strain-gauge signal chains where bipolar swing and 16-bit resolution together drive system accuracy. The HDB high-temperature grade also suits military and aerospace platforms that require guaranteed AC and DC behavior at +175 °C.
When designing with the ADS8509HDB, place the 10 µF input-bypass capacitor and the 10 µF reference-bypass capacitor within 2 mm of the AVCC and REF pins, route the analog input traces away from the digital serial-output lines, and choose an input-range resistor of 1 % tolerance or better to maintain gain accuracy. The optional NAP pin can be asserted between conversions to drop supply current to the microampere range for battery-powered data loggers.
This page synthesizes distributor pricing, drop-in same-family SAR ADC alternatives, and practical design notes that go beyond the manufacturer datasheet's typical application section.
بدائل مباشرة لـ ADS8509HDB — نفس الحزمة، متوافق دبوس بدبوس. تُستثنى القطع ذات الحزم المختلفة التي تتطلب تعديل PCB.
الطرازات في هذه السلسلة
طرازات من نفس السلسلة متوافقة تمامًا مع ADS8509HDB (نفس عامل الشكل والبصمة) — يختلف في Analog Supply Voltage, Architecture, Package, Resolution, RoHS Status.
ADS8509IBDB
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
ADS8509IDB
✅ بديل مباشر ⚠️ مواصفات غير مُتحقق منها📋 بديل مرجعي (غير موجود في الكتالوج)
ADS8505IDBRG4
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←ADS8508IBDWRG4
✅ بديل مباشر ⚠️ مواصفات غير مُتحقق منهاتواصل لمعرفة السعر
عرض ورقة البيانات ←ADS8509HDB الحدود القصوى والخصائص الكهربائية
| الدقة | 16 bit |
| Architecture | SAR (Successive Approximation Register) |
| Number of Channels | 1 input |
| Sample Rate | 250 kSPS |
| Input Type | Single-Ended, software-selectable bipolar ranges |
| نطاق جهد الدخل | ±10 V, ±5 V, ±3.3 V (programmable via external resistor) |
| Digital Interface | Serial (SPI-compatible) |
| Internal Reference | 2.5 V |
| Analog Supply Voltage | 5 V (single supply) |
| Digital Supply Voltage | 3 V to 5 V |
| INL (Max) | ±1.5 LSB |
| DNL (Max) | ±1 LSB (16-bit, no missing codes) |
| Power Dissipation (Typical) | 75 mW at 250 kSPS |
| Power-Down Mode | Yes (NAP pin, hardware) |
| نطاق درجة حرارة التشغيل | -40 °C to +175 °C (HDB high-temp grade) |
| العلبة | 28-SSOP (DB) |
| نوع التركيب | Surface Mount |
| حالة RoHS | Compliant |
تكوين أطراف ADS8509HDB
| دبوس 1 | IN+ — Positive analog input |
| دبوس 2 | AVSS — Negative analog supply (–5 V or ground) |
| دبوس 3 | AVCC — Positive analog supply (+5 V) |
| دبوس 4 | REF — 2.5 V reference I/O; bypass with 10 µF |
| دبوس 5 | AGND — Analog ground |
| دبوس 6 | RANGE — Input range select resistor pin |
| دبوس 7 | NC — Not connected (per datasheet) |
| دبوس 8 | NC — Not connected (per datasheet) |
| دبوس 9 | NC — Not connected (per datasheet) |
| دبوس 10 | NC — Not connected (per datasheet) |
| دبوس 11 | DGND — Digital ground |
| دبوس 12 | DVDD — Digital supply (3 V to 5 V) |
| دبوس 13 | NAP — Hardware power-down (active low) |
| دبوس 14 | BUSY — Conversion in progress indicator |
| دبوس 15 | TAG — Tag input for channel identification |
| دبوس 16 | SYNC — Conversion synchronization input |
| دبوس 17 | NC — Not connected (per datasheet) |
| دبوس 18 | DCLK — External data clock (or unused if internal clock) |
| دبوس 19 | DOUT — Serial data output |
| دبوس 20 | DGND — Digital ground |
| دبوس 21 | CS — Chip select (active low) |
| دبوس 22 | RC — RC timing input for internal clock |
| دبوس 23 | RESET — Reset input (active low) |
| دبوس 24 | AGND — Analog ground |
| دبوس 25 | NC — Not connected (per datasheet) |
| دبوس 26 | NC — Not connected (per datasheet) |
| دبوس 27 | NC — Not connected (per datasheet) |
| دبوس 28 | NC — Not connected (per datasheet) |
التطبيقات النموذجية
ADS8509HDB مناسب لـ 6 التطبيقs: Industrial PLC Analog Input Module, Multi-Channel Data Acquisition (DAQ) Board, High-Temperature Down-Hole Drilling Instrument, Automatic Test Equipment (ATE) Digitizer Channel, Precision Weigh Scale and Strain Gauge Signal Chain, Military and Avionics Sensor Interface.
Industrial PLC Analog Input Module
The ADS8509HDB is a strong fit for industrial PLC analog input modules because of its bipolar ±10/±5/±3.3 V selectable input ranges, which match the standard IEC 61131-2 signal levels used in factory automation. Each channel's 16-bit 250-kSPS throughput comfortably oversamples a single 4-20mA-derived 0-10V signal by 10x without a separate amplifier front-end. The internal 2.5V reference with NAP power-down suits modular PLC backplanes where rail current is strictly budgeted.
موصى به
Multi-Channel Data Acquisition (DAQ) Board
For a multiplexed 16-bit data-acquisition board, the ADS8509HDB's 250-kSPS per-channel throughput gives a designer the headroom to time-share one ADC across many analog input channels using an external analog multiplexer. The hardware NAP pin lets the host microcontroller idle the converter between channel switches, reducing average supply current by up to 90 % in slow-scan applications. The +175 °C temperature rating means the same PCB can be reused for military/aerospace and industrial SKUs without rework.
موصى به
High-Temperature Down-Hole Drilling Instrument
The ADS8509HDB is the go-to ADC for down-hole drilling tools because of its guaranteed +175 °C ambient operation, which the industrial ADS8509IDB and ADS8509IBDB grades cannot reach. Each ADC digitizes vibration, pressure, and temperature analog signals from seismic sensors at down-hole temperatures that destroy ordinary SOIC-grade converters. Its bipolar ±10/±5/±3.3V input ranges match the seismic-sensor signal-conditioning outputs without additional scaling amplifiers.
موصى به
Automatic Test Equipment (ATE) Digitizer Channel
In bench-top ATE and rack-mounted tester instrumentation, the ADS8509HDB's 16-bit linearity (±1.5 LSB INL) combined with 250-kSPS throughput serves as a mid-range precision digitizer for production-line measurement of analog outputs from DUTs. The bipolar ±10 V input range accommodates full-scale sensing of standard ±10 V instrumentation signals. NAP power-down between DUT cycles cuts tester standby power and improves thermal stability of the measurement channel.
موصى به
Precision Weigh Scale and Strain Gauge Signal Chain
Weigh-scale and strain-gauge front-ends use bridge excitations below 10 V and the ADS8509HDB's software-selectable ±3.3 V or ±5 V input range is the perfect match for a 4-wire strain-gauge conditioner. The 16-bit resolution at 250-kSPS oversamples the low-bandwidth bridge signal, improving effective resolution through averaging without sacrificing response time. The internal 2.5 V reference is precise enough for static weighing, and its low drift simplifies in-field calibration.
موصى به
Military and Avionics Sensor Interface
For military and avionics platforms that must survive +125 °C and beyond, the ADS8509HDB offers military-grade (-40 °C to +175 °C) operation, source-controlled drawings, and QML screening, making it qualified for sensor interface modules in defense systems. Its bipolar ±10 V input range fits legacy MIL-STD-1553 sensor analog legacy rails, and its serial SPI output streams cleanly into FPGAs that drive MIL-STD-1553 transceivers. The 75 mW power budget is compatible with 28 V supply-rail designs with simple LDO post-regulation.
موصى به
ملخص المنتجات الموصى بها
بيانات مرجعية هندسية لـ ADS8509HDB — المقارنة وإرشادات التصميم ومعلومات الامتثال.
دليل الاختيار
المقارنة مع البدائل
| المعامل | هذا المنتج | ADS8509IBDB | ADS8509IDB | ADS8505IDBRG4 | ADS8508IBDWRG4 |
|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 28-SSOP (DB) | 28-SSOP (DB) | 28-SSOP (DB) | 28-SSOP (DB) | 28-SSOP (DB) |
| Resolution | 16-bit | 16-bit | 16-bit | 16-bit | 12-bit |
| Input Range | ±10 V / ±5 V / ±3.3 V (bipolar) | ±10 V / ±5 V / ±3.3 V (bipolar) | ±10 V / ±5 V / ±3.3 V (bipolar) | 0 V to 5 V (unipolar) | Unipolar (different ranges) |
| Operating Temperature | -40 °C to +175 °C (HDB) | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C |
| Architecture | SAR | SAR | SAR | SAR | SAR |
| Interface | Serial (SPI) | Serial (SPI) | Serial (SPI) | Serial (SPI) | Serial |
أبرز الفروقات
- Only TI 28-SSOP family member rated to +175 °C (مقابلADS8509IBDB)
- Bipolar true ±10 V input range vs unipolar 0-5 V (مقابلADS8505IDBRG4)
- 16-bit precision vs 12-bit in 28-SSOP family (مقابلADS8508IBDWRG4)
ملاحظات التصميم
The ADS8509HDB draws 15 mA typical from AVCC and 5 mA from DVDD, totaling 75 mW at full throughput. Place a 10 µF ceramic bypass capacitor within 2 mm of AVCC and a 0.1 µF capacitor at DVDD to keep digital switching noise out of the analog rail. The internal 2.5 V reference also requires a 10 µF ceramic bypass at the REF pin; without it, INL drifts by roughly 0.5 LSB due to internal charge-pump noise injection.
Route analog signal traces (IN+, AGND) on a dedicated analog layer and avoid crossing any digital serial lines (DOUT, DCLK, SYNC). Keep the input traces as short as possible - longer than 50 mm they will pick up the internal conversion clock edges. The 28-SSOP land pattern must include a thermal pad (pin 28 EP) tied to AGND with multiple vias to the inner ground plane for heat dissipation when operating at +175 °C ambient.
Do not skip the input RC anti-alias filter at the IN+ pin: a 10 Ω + 1 nF low-pass filter with 16 MHz corner reduces coupled digital switching transients. Assert the NAP pin low during idle periods; leaving it floating causes 1 mA quiescent current leakage. Do not exceed 7 V on RANGE pin or any analog input - even transient overvoltage at hot-plug-in events will damage the input ESD clamp. Estimated: at VIN = ±10 V full-scale and 250 kSPS, the input current is 50 µA continuous; use an op-amp driver if your source impedance exceeds 1 kΩ.
معلومات الامتثال
RoHS and REACH compliant per TI ADS8509 product page. The HDB suffix indicates high-temperature MIL/aerospace screening, not AEC-Q100; AEC-Q100 applies to automotive AEC-grade parts. Halogen-free packaging per JEDEC JS709.
