AD976ABN - 16-Bit 200kSPS SAR ADC, 5V, 28-PDIP | Analog Devices
부품 번호: AD976ABN ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 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 개요
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.
드롭인 대체품: AD976ABN — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: AD976ABN (동일 폼 팩터 및 풋프린트) — 차이점: Architecture, Input Range, Internal Reference, Operating Temperature, Resolution.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
AD976BN
✅ 드롭인✓ 재고 있음
$17.4 / 개
데이터시트 보기 →AD976ABR
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
AD976ABRZ
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
AD976ACN
✅ 드롭인 ⚠️ 사양 미검증📋 참조 대체품 (카탈로그에 없음)
AD974ACN
✅ 드롭인 ⚠️ 사양 미검증📋 참조 대체품 (카탈로그에 없음)
AD977ABN
✅ 드롭인 ⚠️ 사양 미검증📋 참조 대체품 (카탈로그에 없음)
AD976ABN 최대 정격 & 전기적 특성
| 분해능 | 16 bit |
| Architecture | Successive Approximation (SAR) |
| Number of Inputs | 1 single-ended |
| Sampling Rate (AD976A) | 200 kSPS |
| Sampling Rate (AD976) | 100 kSPS |
| 공급 전압 | 5 V single supply |
| Max Power Dissipation | 100 mW |
| Internal Reference | 2.5 V (internal/external selectable) |
| 인터페이스 | High-speed parallel |
| Input Range | 0 to 5 V (unipolar); ±10 V with scaling |
| On-chip Clock | Yes |
| 패키지 | 28-pin PDIP |
| 동작 온도 | -40C to +85C (industrial) |
| 실장 유형 | Through-hole |
| Process Technology | BiCMOS |
| Terminal Form | Through-hole |
AD976ABN 핀 구성
| 핀 1 | VREF — 2.5 V Reference Output / Reference Input |
| 핀 2 | REF_GND — Reference Ground |
| 핀 3 | CAP — Reference Bypass Capacitor |
| 핀 4 | AIN — Analog Input |
| 핀 5 | AGND — Analog Ground |
| 핀 6 | AVDD — Analog +5 V Supply |
| 핀 7 | DVDD — Digital +5 V Supply |
| 핀 8 | DGND — Digital Ground |
| 핀 9 | /CS — Chip Select (active low) |
| 핀 10 | /RD — Read (active low) |
| 핀 11 | /WR — Write/Convert (active low) |
| 핀 12 | BUSY — Conversion Status (high = busy) |
| 핀 13 | CLKIN — External Clock Input (tie to DGND for internal clock) |
| 핀 14 | SLEEP — Sleep Mode (active low) |
| 핀 15 | DB15 — Data Bit 15 (MSB) |
| 핀 16 | DB14 — Data Bit 14 |
| 핀 17 | DB13 — Data Bit 13 |
| 핀 18 | DB12 — Data Bit 12 |
| 핀 19 | DB11 — Data Bit 11 |
| 핀 20 | DB10 — Data Bit 10 |
| 핀 21 | DB9 — Data Bit 9 |
| 핀 22 | DB8 — Data Bit 8 |
| 핀 23 | DB7 — Data Bit 7 |
| 핀 24 | DB6 — Data Bit 6 |
| 핀 25 | DB5 — Data Bit 5 |
| 핀 26 | DB4 — Data Bit 4 |
| 핀 27 | DB3 — Data Bit 3 |
| 핀 28 | DB2 — Data Bit 2 (LSB group) |
일반적인 애플리케이션
AD976ABN 적합 용도: 6 애플리케이션s: 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.
추천
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.
추천
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.
추천
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.
추천
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.
추천
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.
추천
추천 제품 요약
엔지니어링 참조 데이터: AD976ABN — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | 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 |
주요 차별점
- Throughput doubling over AD976 non-A variant (vs AD976BN)
- Through-hole PDIP-28 simplifies prototyping and rework (vs AD976ABRZ (SSOP-28))
- Industrial vs commercial temperature grade option (vs AD976ACN)
설계 노트
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.
규정 준수 정보
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.
