AD976ABN - 16-Bit 200kSPS SAR ADC, 5V, 28-PDIP | Analog Devices
Артикул: AD976ABN ✓ Активен| Кол-во | Цена за ед. | Итого |
|---|---|---|
| 1 | $24.5 | $24,50 |
| 10 | $22.05 | $220,50 |
| 100 | $19.6 | $1.960,00 |
| 500 | $17.4 | $8.700,00 |
| 1.000 | $15.5 | $15.500,00 |
AD976ABN Обзор
What is a SAR ADC? A successive-approximation-register analog-to-digital converter is a sampling converter that uses a binary-search algorithm against an internal DAC and comparator to resolve one bit per clock cycle. SAR ADCs sit at the intersection of precision (16-bit and higher) and moderate speed (tens of kSPS to a few MSPS), outperforming flash and pipelined converters in power efficiency and latency while trading off raw speed. They are widely used in industrial process control, instrumentation, and data-acquisition boards where dc-to-audio bandwidth signals must be digitized without the pipeline delay of a pipelined ADC.
Key features include single 5 V supply operation, 100 mW max power dissipation, internal 2.5 V reference (with external override), on-chip clock generator, factory-calibrated linearity (no user calibration required), and a high-speed parallel interface for direct connection to microprocessors, FPGAs, or DSP data buses. Input ranges are configured for unipolar 0-5 V or bipolar ±10 V operation with the proper front-end scaling. The 200 kSPS throughput of the AD976A is double the AD976 100 kSPS rate, making it the preferred choice where the bus and downstream logic can sustain the higher sample rate.
Architecturally, the AD976ABN is built on a BiCMOS process that combines bipolar precision devices for the input front-end and reference buffer with CMOS logic for the SAR engine, clock, and digital interface. The switched-capacitor input architecture provides inherent sample-and-hold operation, simplifying front-end driver design. Factory calibration trims integral and differential nonlinearity to datasheet limits, removing the iterative software-calibration routine required by many older 16-bit SAR parts and accelerating design-in.
Typical applications include industrial process control front ends, multi-channel data-acquisition boards, weigh-scale and strain-gauge instrumentation, motor-control current-sense digitizers, and portable test instruments that need a proven 16-bit ADC on a single 5 V rail. The high throughput and parallel interface make it well suited to closed-loop control where deterministic conversion latency is essential.
Design consideration: the input driver amplifier must settle the switched-capacitor input within the acquisition window at full throughput, and the parallel interface traces should be length-matched and series-terminated to avoid digital bus coupling into the analog input. A 100 nF ceramic decoupling cap must be placed within a few millimeters of the supply pins, with bulk capacitance at the regulator output.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes that complement but do not replace the Analog Devices datasheet.
Аналоги без доработки для AD976ABN — 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 AD976ABN (тот же форм-фактор и посадочное место) — отличается по Architecture, Input Range, Internal Reference, Operating Temperature, Resolution.
Инструмент быстрого сравнения — выберите альтернативные компоненты для сравнения бок о бок:
AD976BN
✅ Прямая замена✓ В наличии
$17.4 / шт.
Открыть даташит →AD976ABR
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
AD976ABRZ
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
AD976ACN
✅ Прямая замена ⚠️ Характеристики не проверены📋 Справочный аналог (нет в каталоге)
AD974ACN
✅ Прямая замена ⚠️ Характеристики не проверены📋 Справочный аналог (нет в каталоге)
AD977ABN
✅ Прямая замена ⚠️ Характеристики не проверены📋 Справочный аналог (нет в каталоге)
AD976ABN Максимальные параметры и электрические характеристики
| Разрешение | 16 bit |
| Architecture | Successive Approximation (SAR) |
| Number of Inputs | 1 single-ended |
| Sampling Rate (AD976A) | 200 kSPS |
| Sampling Rate (AD976) | 100 kSPS |
| Напряжение питания | 5 V single supply |
| Max Power Dissipation | 100 mW |
| Internal Reference | 2.5 V (internal/external selectable) |
| Интерфейс | High-speed parallel |
| Input Range | 0 to 5 V (unipolar); ±10 V with scaling |
| On-chip Clock | Yes |
| Корпус | 28-pin PDIP |
| Рабочая температура | -40C to +85C (industrial) |
| Тип монтажа | Through-hole |
| Process Technology | BiCMOS |
| Terminal Form | Through-hole |
Конфигурация выводов AD976ABN
| Контакт 1 | VREF — 2.5 V Reference Output / Reference Input |
| Контакт 2 | REF_GND — Reference Ground |
| Контакт 3 | CAP — Reference Bypass Capacitor |
| Контакт 4 | AIN — Analog Input |
| Контакт 5 | AGND — Analog Ground |
| Контакт 6 | AVDD — Analog +5 V Supply |
| Контакт 7 | DVDD — Digital +5 V Supply |
| Контакт 8 | DGND — Digital Ground |
| Контакт 9 | /CS — Chip Select (active low) |
| Контакт 10 | /RD — Read (active low) |
| Контакт 11 | /WR — Write/Convert (active low) |
| Контакт 12 | BUSY — Conversion Status (high = busy) |
| Контакт 13 | CLKIN — External Clock Input (tie to DGND for internal clock) |
| Контакт 14 | SLEEP — Sleep Mode (active low) |
| Контакт 15 | DB15 — Data Bit 15 (MSB) |
| Контакт 16 | DB14 — Data Bit 14 |
| Контакт 17 | DB13 — Data Bit 13 |
| Контакт 18 | DB12 — Data Bit 12 |
| Контакт 19 | DB11 — Data Bit 11 |
| Контакт 20 | DB10 — Data Bit 10 |
| Контакт 21 | DB9 — Data Bit 9 |
| Контакт 22 | DB8 — Data Bit 8 |
| Контакт 23 | DB7 — Data Bit 7 |
| Контакт 24 | DB6 — Data Bit 6 |
| Контакт 25 | DB5 — Data Bit 5 |
| Контакт 26 | DB4 — Data Bit 4 |
| Контакт 27 | DB3 — Data Bit 3 |
| Контакт 28 | DB2 — Data Bit 2 (LSB group) |
Типичное применение
AD976ABN подходит для 6 применениеs: Industrial Process Control Front End, Multi-Channel Data Acquisition Boards, Weigh-Scale and Strain-Gauge Instrumentation, Motor-Control Current-Sense Digitizers, Portable Test and Measurement Instruments, Medical Patient Monitoring Front Ends.
Industrial Process Control Front End
The AD976ABN's 200 kSPS throughput and 16-bit SAR architecture make it a strong choice for industrial process-control front ends where a 4-20 mA or 0-10 V analog input must be digitized with sub-millisecond latency. The chip's on-chip clock eliminates the need for an external clock source, and the parallel interface can be connected directly to an FPGA or DSP for deterministic bus-cycle reads, which is essential for closed-loop PID control. Designers can rely on the factory-calibrated linearity to avoid host-side calibration routines. To preserve accuracy, place a precision op-amp buffer (e.g., AD8628 zero-drift) ahead of the ADC input and decouple AVDD/DVDD with separate ferrite-bead-isolated 5 V rails.
Рекомендуется
Multi-Channel Data Acquisition Boards
For legacy PC/104, VME, and PCI data-acquisition cards that need a proven parallel-output 16-bit ADC, the AD976ABN's 28-pin PDIP simplifies prototype soldering and rework on through-hole backplanes. Designers commonly pair it with a 16-channel analog mux such as the ADG706 to fan 16 single-ended channels into one ADC, accepting the tradeoff of slower per-channel sample rates. The internal 2.5 V reference (overridable by an external ADR03 for ratiometric bridge measurements) supports both 0-5 V unipolar inputs and scaled bipolar inputs. Each channel can be calibrated digitally using the host's gain and offset registers.
Рекомендуется
Weigh-Scale and Strain-Gauge Instrumentation
Weigh scales and load-cell instrumentation demand 16-bit (or better) resolution and low integral non-linearity, both of which the AD976ABN's factory-calibrated SAR architecture delivers from a single 5 V supply. The bridge excitation (typically 5 V or 10 V) is supplied separately, while the bridge differential output is amplified by an instrumentation amp and fed to the ADC input. The internal 2.5 V reference (or an external ADR03 for absolute accuracy) sets the conversion scale. Designers must average multiple conversions in firmware and apply temperature compensation for the highest accuracy. Theon-chip clock simplifies the design and reduces BOM cost.
Рекомендуется
Motor-Control Current-Sense Digitizers
Field-oriented control (FOC) motor drives require sub-microsecond current-loop feedback, which the AD976ABN's 200 kSPS throughput can satisfy when sampling one phase current per conversion with explicit read/latency control. The chip's parallel interface is well-suited to DSPs and FPGAs that need deterministic conversion-to-PWM-pipeline timing. A current-sense amplifier such as AD8205 or AD8210 fronts the shunt resistor, providing 0-5 V unipolar output into the ADC. Designers should keep the current-sense traces short and twisted-pair shielded to reject PWM edge noise coupling into the analog front end.
Рекомендуется
Portable Test and Measurement Instruments
Handheld multimeters, oscilloscope front ends, and portable signal analyzers benefit from the AD976ABN's 100 mW power dissipation and single 5 V supply, both of which keep battery-size and thermal-management budgets within reach. One ADC can be time-shared across voltage, current, and temperature channels using a small analog mux, accepting a modest per-channel throughput in exchange for component consolidation. The parallel interface simplifies connection to an LCD-controller SoC and reduces MIPS demand compared to higher-speed serial ADCs that require precise clock management. Designers should use low-quiescent regulators like ADP3330 to maximize battery life.
Рекомендуется
Medical Patient Monitoring Front Ends
Although the AD976ABN is not a fully AEC-Q100 or medical-grade-qualified part, it can serve in non-life-critical patient-monitoring front ends such as blood-pressure cuffs, pulse-oximeter signal conditioning chains, and clinical thermometry digitization. The 16-bit resolution is sufficient for these bandwidths, and the single 5 V supply keeps the analog-front-end design simple. Designers must add patient isolation per IEC 60601-1 outside the ADC (typically with ADuM1411 digital isolators), enable reliability features like self-test patterns during idle, and follow conservative decoupling and grounding practices. Multiple-sample averaging in software removes broadband noise.
Рекомендуется
Сводка рекомендуемых товаров
Справочные инженерные данные для AD976ABN — сравнение, рекомендации по проектированию и информация о соответствии.
Руководство по выбору
Сравнение с аналогами
| Параметр | Этот товар | AD976BN | AD976ABR | AD976ABRZ | AD976ACN | AD974ACN | AD977ABN |
|---|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | PDIP-28 | PDIP-28 - same | SOIC-28 | SSOP-28 | PDIP-28 - same | PDIP-28 - same | PDIP-28 - same |
| Resolution | 16 bit | 16 bit | 16 bit | 16 bit | 16 bit | 16 bit | 16 bit |
| Throughput | 200 kSPS | 100 kSPS | 200 kSPS | 200 kSPS | 200 kSPS | 200 kSPS | 200 kSPS |
| Supply Voltage | 5 V single supply | 5 V single supply | 5 V single supply | 5 V single supply | 5 V single supply | 5 V single supply | 5 V single supply |
| Max Power Dissipation | 100 mW | 100 mW | 100 mW | 100 mW | 100 mW | 100 mW | 100 mW |
| Internal Reference | 2.5 V | 2.5 V | 2.5 V | 2.5 V | 2.5 V | 2.5 V | 2.5 V |
| Temperature Range | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | 0C to +70C (commercial) | 0C to +70C (commercial) | -40C to +85C |
| Interface | Parallel | Parallel | Parallel | Parallel | Parallel | Parallel | Parallel |
Ключевые отличия
- Throughput doubling over AD976 non-A variant (против AD976BN)
- Through-hole PDIP-28 simplifies prototyping and rework (против AD976ABRZ (SSOP-28))
- Industrial vs commercial temperature grade option (против AD976ACN)
Заметки по проектированию
Decouple AVDD and DVDD with separate ferrites and bulk capacitors. Place a 100 nF ceramic bypass capacitor within 5 mm of each supply pin and a 10 µF tantalum or polymer bulk on the analog rail. AVDD should be sourced from a low-noise LDO such as ADP3330 rather than the main 5 V digital rail to keep digital switching currents out of the analog reference. Connect analog and digital grounds at a single point near the ADC's AGND pin, with the PCB's analog and digital ground planes tied only at that point.
Route the 16 data bus lines in a matched-length group with series termination (typically 22-47 Ω) near the ADC to avoid ringing on parallel-bus edges. Keep the analog input trace short and guarded by ground copper on both sides to minimize coupling from adjacent digital lines. Place the input buffer op-amp and its bypass capacitors within 10 mm of the AIN pin. The reference decoupling capacitor on the CAP pin must be a low-ESR ceramic, not a polarised electrolytic, to maintain reference stability.
Drive the ADC's analog input with a precision op-amp capable of settling to 16-bit accuracy within the acquisition window. For 200 kSPS throughput the acquisition time is typically several hundred nanoseconds, so choose op-amps with at least 10 MHz GBW and sub-µs settling. If the input source is bipolar ±10 V, follow it with a precision divider and differential driver such as AD8138 to scale and translate to the ADC's 0-5 V unipolar input range. Add an RC anti-aliasing filter with fc just above the Nyquist frequency.
Do not float the CLKIN pin: for on-chip clock operation, tie it to DGND via 10 kΩ; for external clock operation, drive it with a clean CMOS clock. Do not overload the internal 2.5 V reference with multiple ADCs - if multiple devices share one reference, drive the REF pin from an external ADR03 or AD780. Avoid slow rising edges on /CS or /WR; the timing diagram in the datasheet specifies minimum pulse widths that must be respected, otherwise conversion results can be unpredictable.
Информация о соответствии
RoHS, REACH, lead-free, halogen-free, and conflict-minerals status not explicitly stated in the retrieved web snippets; check the manufacturer datasheet or product page for definitive statements. Not AEC-Q100 qualified - this is a general-purpose industrial ADC.
