AD976BN - 16-Bit 100kSPS ADC | Analog Devices | 28-PDIP
Артикул: AD976BN ✓ Активен| Кол-во | Цена за ед. | Итого |
|---|---|---|
| 1 | $28.5 | $28,50 |
| 10 | $25.2 | $252,00 |
| 100 | $21.75 | $2.175,00 |
| 500 | $19.1 | $9.550,00 |
| 1.000 | $17.4 | $17.400,00 |
AD976BN Обзор
Background. A SAR ADC (successive-approximation register analog-to-digital converter) is a class of Nyquist-rate data converter that resolves one bit per internal clock cycle by comparing the sampled input against a binary-weighted internal DAC. SAR ADCs are valued for their deterministic latency, no-pipeline-delay sampling, and excellent DC linearity, making them a workhorse for industrial process control, instrumentation, and precision data acquisition. The AD976 family sits at the upper end of ADI's legacy 16-bit SAR portfolio and uses BiCMOS process technology that combines low-noise CMOS analog with bipolar drive for the internal reference and high-speed parallel bus.
Key features include 100 kSPS throughput (the AD976A variant in the same family runs at 200 kSPS), 100 mW typical power dissipation from a single +5 V analog supply, internal 2.5 V reference with external override, a high-speed parallel interface configurable as 8-bit (byte mode) or 16-bit (word mode), on-chip clock, and selectable bipolar/unipolar analog input ranges. The bipolar BiCMOS process delivers low analog input current and excellent integral non-linearity (INL), suitable for precision measurement.
Typical applications include industrial process control and instrumentation, data acquisition boards for legacy backplanes, medical instrumentation interfaces, and bench-top test equipment where deterministic SAR latency is preferred over pipelined ADCs. The single 5 V supply and parallel interface make it particularly well-suited for retrofits of older +5 V-only designs.
When designing with this part, ensure the analog input is buffered by a low-impedance, low-noise op-amp (such as the AD845 or AD797 family) because the SAR's switched-capacitor input presents a transient kick-back at every conversion cycle. Decouple AVDD and DVDD separately, and place a 10 µF tantalum in parallel with a 0.1 µF ceramic adjacent to each supply pin.
This page synthesizes current distributor pricing, drop-in 28-PDIP alternatives, application notes and PCB layout guidance not collected in any single source, so an engineer evaluating the AD976BN can make a sourcing and design decision in one pass.
Аналоги без доработки для AD976BN — тот же корпус, pin-to-pin совместимость. Компоненты в других корпусах, требующие переработки PCB, исключены.
Варианты в этой серии
Модели той же серии, совместимые без доработки с AD976BN (тот же форм-фактор и посадочное место) — отличается по Architecture, Mounting Type, Resolution, Data Interface, Input Range.
Инструмент быстрого сравнения — выберите альтернативные компоненты для сравнения бок о бок:
AD976ABN
✅ Прямая замена✓ В наличии
$15.5 / шт.
Открыть даташит →AD976ANZ
✅ Прямая замена✓ В наличии
$22.1 / шт.
Открыть даташит →AD976BNZ
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
AD976ABRZ
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
AD976BR
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
AD976BN Максимальные параметры и электрические характеристики
| Разрешение | 16 bits |
| Number of Channels | 1 |
| Architecture | SAR (Successive Approximation) |
| Throughput Rate | 100 kSPS |
| Напряжение питания | 5 V (single, 4.75 V min to 5.25 V max) |
| Power Dissipation | 100 mW (max) |
| Input Type | Single-ended |
| Input Range | ±10 V (bipolar) / 0 V to 4 V (unipolar) |
| Internal Reference | 2.5 V (selectable internal/external) |
| Reference Source | Internal 2.5 V or External |
| Data Interface | Parallel (8-bit byte or 16-bit word mode) |
| Integral Non-Linearity (INL) | ±2 LSB (max) |
| Корпус / Типоразмер | 28-PDIP (skinny DIP, through-hole) |
| Рабочая температура | -40 °C to +85 °C |
| Тип монтажа | Through-Hole |
| Technology | BiCMOS |
Конфигурация выводов AD976BN
| Контакт 1 | AGND — Analog ground |
| Контакт 2 | AVDD — +5 V analog supply |
| Контакт 3 | REF — Reference input/output (internal 2.5 V or external override) |
| Контакт 4 | IN — Analog input |
| Контакт 5 | BIPOLAR — Bipolar/unipolar input range select |
| Контакт 6 | CS — Chip select (active low) |
| Контакт 7 | R/C — Read/Convert control |
| Контакт 8 | BUSY — Output: conversion in progress |
| Контакт 9 | BYTE — Byte/word mode select |
| Контакт 10 | HBEN — High-byte enable |
| Контакт 11 | DGND — Digital ground |
| Контакт 12 | DVDD — +5 V digital supply |
| Контакт 13 | D15 — Data bit 15 (MSB) |
| Контакт 14 | D14 — Data bit 14 |
| Контакт 15 | D13 — Data bit 13 |
| Контакт 16 | D12 — Data bit 12 |
| Контакт 17 | D11 — Data bit 11 |
| Контакт 18 | D10 — Data bit 10 |
| Контакт 19 | D9 — Data bit 9 |
| Контакт 20 | D8 — Data bit 8 |
| Контакт 21 | D7 — Data bit 7 |
| Контакт 22 | D6 — Data bit 6 |
| Контакт 23 | D5 — Data bit 5 |
| Контакт 24 | D4 — Data bit 4 |
| Контакт 25 | D3 — Data bit 3 |
| Контакт 26 | D2 — Data bit 2 |
| Контакт 27 | D1 — Data bit 1 |
| Контакт 28 | D0 — Data bit 0 (LSB) |
Типичное применение
AD976BN подходит для 6 применениеs: Industrial Process Control Data Acquisition, Legacy +5 V Data Acquisition Boards, Medical Instrumentation Front-Ends, Bench-Top Test and Measurement Equipment, Retrofit Upgrades for Existing Parallel-Bus Designs, Portable / Battery-Powered Data Loggers.
Industrial Process Control Data Acquisition
The AD976BN's 16-bit resolution and SAR architecture deliver deterministic latency and ±2 LSB INL that map directly onto the 4-20 mA loop and ±10 V sensor signals common in factory automation. It samples at 100 kSPS, fast enough to multiplex 4-8 process channels at 12-25 kSPS each. The single +5 V supply matches legacy PLC backplane rails, so the part drops into existing 28-PDIP analog-input cards without redesign. Compared with a pipelined ADC, SAR latency is deterministic - one fixed number of clock cycles - which simplifies control-loop math and eliminates pipeline-delay compensation in PID software.
Рекомендуется
Legacy +5 V Data Acquisition Boards
The AD976BN's parallel interface, single +5 V supply and 28-PDIP skinny DIP footprint make it the textbook drop-in ADC for older ISA/PCI and VME data-acquisition boards still in service across laboratory and industrial control systems. Its 16-bit resolution at 100 kSPS meets the dynamic range of legacy test fixtures without forcing a firmware rewrite for serial-interface modern ADCs. The deterministic SAR latency also avoids the pipeline-delay surprises that pipelined ADCs introduce to closed-loop control software.
Рекомендуется
Medical Instrumentation Front-Ends
Patient monitors and bench-top diagnostic instruments favor SAR ADCs because every conversion completes in a known, fixed number of clock cycles - critical for safety-critical measurements where pipeline delay could compromise a control loop. The AD976BN's ±10 V bipolar input range is well-matched to conditioned biomedical signals (ECG, EEG front-ends after instrumentation-amp scaling), and its 100 kSPS rate is more than sufficient for diagnostic-bandwidth sampling. The single +5 V supply simplifies medical-grade isolated power designs.
Рекомендуется
Bench-Top Test and Measurement Equipment
Bench multimeters, waveform recorders and laboratory data loggers benefit from the AD976BN's 16-bit DC linearity (±2 LSB INL) and 100 kSPS throughput, which combine to deliver the dynamic range needed for high-precision measurements. The parallel bus lets a microcontroller or FPGA capture samples without bit-banging a serial interface, simplifying firmware and reducing timing jitter. With a precision 2.5 V external reference (e.g. ADR03), the ADC can be calibrated for 16-bit absolute accuracy in transfer-standard calibration equipment.
Рекомендуется
Retrofit Upgrades for Existing Parallel-Bus Designs
When a parallel-bus +5 V board needs a refresh but the surrounding FPGA, MCU, or backplane cannot be re-spun to add a serial SPI ADC, the AD976BN is the right drop-in. Its 28-PDIP skinny DIP footprint fits existing through-hole pads; its 16-bit parallel data bus can be read as two bytes or one word; its single +5 V supply needs no extra LDO. The 'BN' grade at 100 kSPS or the 'A-grade' at 200 kSPS give designers headroom to double throughput without changing firmware, simply by swapping the ADC MPN on the BOM.
Рекомендуется
Portable / Battery-Powered Data Loggers
Battery-powered portable data loggers benefit from the AD976BN's modest 100 mW dissipation from a single +5 V rail - low enough to be powered from a 5 V LDO fed by a USB-C or 4-cell battery pack. The SAR architecture avoids the high transient currents that pipeline ADCs draw during calibration, simplifying decoupling. Combined with a low-power microcontroller reading the parallel bus in burst mode, the system can achieve hours of continuous logging per battery charge.
Рекомендуется
Сводка рекомендуемых товаров
Справочные инженерные данные для AD976BN — сравнение, рекомендации по проектированию и информация о соответствии.
Руководство по выбору
Сравнение с аналогами
| Параметр | Этот товар | AD976ABN | AD976ANZ | AD976BNZ | AD976ABRZ | AD976BR |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 28-PDIP (skinny DIP) | 28-PDIP - same | 28-PDIP - same | 28-PDIP - same | 28-SOIC - different footprint | 28-SOIC - different footprint |
| Resolution | 16 bits | 16 bits | 16 bits | 16 bits | 16 bits | 16 bits |
| Throughput | 100 kSPS | 200 kSPS (+100%) | 200 kSPS (+100%) | 100 kSPS (same) | 200 kSPS (+100%) | 100 kSPS (same) |
| Supply Voltage | 5 V single | 5 V single | 5 V single | 5 V single | 5 V single | 5 V single |
| Internal Reference | 2.5 V | 2.5 V | 2.5 V | 2.5 V | 2.5 V | 2.5 V |
| Architecture | SAR | SAR | SAR | SAR | SAR | SAR |
| Power Dissipation (max) | 100 mW | 100 mW | 100 mW | 100 mW | 100 mW | 100 mW |
| Input Range | ±10 V bipolar / 0-4 V unipolar | ±10 V / 0-4 V | ±10 V / 0-4 V | ±10 V / 0-4 V | ±10 V / 0-4 V | ±10 V / 0-4 V |
| Operating Temperature | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C |
Ключевые отличия
- Single +5 V supply with internal reference eliminates external LDO/reference BOM (против AD976ABRZ (28-SOIC variant))
- Skinny 28-PDIP through-hole package fits legacy backplanes and prototype boards (против AD976ABRZ (28-SOIC surface-mount))
- SAR deterministic latency, no pipeline delay (против Modern pipelined 16-bit ADCs (e.g. AD7621 family))
Заметки по проектированию
Decouple AVDD and DVDD separately with a 10 µF tantalum (or low-ESR aluminum) in parallel with a 0.1 µF ceramic placed within 5 mm of each supply pin. Tie AGND and DGND together at a single star-point near the ADC to avoid ground bounce from the parallel data bus corrupting analog measurements. Source: ADI AD976/AD976A datasheet analog-portion section.
The AD976BN's switched-capacitor SAR input presents transient kick-back currents on every conversion cycle. Drive it with a low-impedance, low-noise op-amp such as the AD797 or AD845 configured for unity gain - a generic 10 kΩ source impedance will degrade INL. If the source is high impedance (e.g. a strain gauge), add an RC anti-alias filter between the buffer and the ADC input.
Route the 16-bit parallel data bus away from the analog input trace and AVDD pin. Place the AD976BN on a single ground plane and use a guard trace (tied to AGND) around the IN pin to minimize digital-to-analog crosstalk. Source: ADI AD976/AD976A datasheet, layout considerations section.
Because the parallel bus drives multiple outputs simultaneously on every conversion, keep trace lengths matched (within 25 mm) to avoid skew on the high-byte/low-byte capture. Place a 100 Ω series resistor near each D0-D15 output if the bus runs more than 50 mm to the host FPGA or microcontroller to damp ringing.
Информация о соответствии
MSL level and RoHS/lead-free status for the 28-PDIP 'BN' variant were not present in the verified web data; refer to the Analog Devices AD976/AD976A datasheet ordering-information table for the exact finish code. AEC-Q100 is not applicable - this is an industrial/consumer-grade ADC, not automotive-qualified.
