AD7899ARS-1 - 14-Bit 400 kSPS 5V SAR ADC | Analog Devices
부품 번호: AD7899ARS-1 ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $18.5 | $18.50 |
| 10 | $16.4 | $164.00 |
| 100 | $13.95 | $1,395.00 |
| 500 | $11.8 | $5,900.00 |
| 1,000 | $10.25 | $10,250.00 |
AD7899ARS-1 개요
A SAR (Successive Approximation Register) ADC is a precision data converter that performs one bit at a time using an internal DAC, comparator, and register logic. SAR ADCs sit in the hierarchy data converter -> ADC -> successive approximation ADC -> precision mixed-signal IC, offering an excellent balance of throughput, accuracy, and low power consumption for mid-speed precision measurements.
Key features include 14-bit resolution with no missing codes, a 400 kSPS throughput rate, a 2.0 µs typical conversion time, ±5 V or 0 to 5 V analog input range (model dependent), ±10 V input range for the AR-1/ARS-1 versions, an on-chip 2.5 V reference, and a single +5 V supply operation. The parallel interface allows direct connection to microprocessors, DSPs, and FPGAs without external glue logic.
The AD7899ARS-1 uses a fully differential switched-capacitor architecture with self-calibration logic, achieving excellent DC accuracy and low aperture uncertainty. The integrated track/hold amplifier supports input bandwidth above the Nyquist limit, and the on-chip oscillator eliminates the need for an external clock source. The high-speed parallel output bus provides 14 data lines plus CONVERT and BUSY handshakes for easy host interfacing.
Typical applications include data acquisition systems, instrumentation, motor control feedback loops, digital signal processing front ends, and industrial process control. The wide input range and single-supply operation also make the part suitable for transducer signal conditioning and embedded measurement modules.
When designing with this ADC, ensure low-impedance input buffering (≤50 Ω source impedance recommended) and place a 100 nF decoupling capacitor close to each supply pin. The parallel interface timing must satisfy the CONVERT/Busy handshake window to avoid data corruption, and the internal reference requires a 10 µF external bypass capacitor on REF pin for optimal noise performance.
This page synthesizes distributor pricing, drop-in alternatives from the AD7899 family, and practical design notes not found in the manufacturer datasheet alone.
드롭인 대체품: AD7899ARS-1 — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
AD7899AR-1
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
AD7899ARS-1REEL7
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
AD7899ARS-2
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
AD7899ARS-3
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
AD7899BR-1
✅ 드롭인 ⚠️ 사양 미검증📋 참조 대체품 (카탈로그에 없음)
ADS8505IBDW
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
AD7899ARS-1 최대 정격 & 전기적 특성
| 분해능 | 14 bit |
| Number of Channels | 1 |
| Conversion Rate | 400 kSPS |
| Conversion Time | 2.0 µs typical |
| Architecture | SAR (Successive Approximation) |
| 공급 전압 | +5 V single supply |
| Supply Voltage Range | 4.75 V to 5.25 V |
| Analog Input Range | ±10 V (ARS-1 version) |
| Internal Reference | 2.5 V (on-chip) |
| 인터페이스 | Parallel |
| 동작 온도 범위 | -40 C to +85 C |
| 패키지 | 28-SSOP (RS) |
| 실장 유형 | Surface Mount |
| RoHS 상태 | Compliant |
| On-chip Clock Oscillator | Yes |
| Track/Hold Amplifier | Integrated |
AD7899ARS-1 핀 구성
| 핀 1 | DB13 — Data output bit 13 (MSB) |
| 핀 2 | DB12 — Data output bit 12 |
| 핀 3 | DB11 — Data output bit 11 |
| 핀 4 | DB10 — Data output bit 10 |
| 핀 5 | DB9 — Data output bit 9 |
| 핀 6 | DB8 — Data output bit 8 |
| 핀 7 | DB7 — Data output bit 7 |
| 핀 8 | DB6 — Data output bit 6 |
| 핀 9 | DB5 — Data output bit 5 |
| 핀 10 | DB4 — Data output bit 4 |
| 핀 11 | DB3 — Data output bit 3 |
| 핀 12 | DB2 — Data output bit 2 |
| 핀 13 | DB1 — Data output bit 1 |
| 핀 14 | DB0 — Data output bit 0 (LSB) |
| 핀 15 | BUSY — Conversion in progress output (active high) |
| 핀 16 | CONVST — Conversion start input (active low) |
| 핀 17 | RD — Read input (active low) |
| 핀 18 | CS — Chip select (active low) |
| 핀 19 | DGND — Digital ground |
| 핀 20 | DVDD — Digital +5 V supply |
| 핀 21 | AGND — Analog ground |
| 핀 22 | AVDD — Analog +5 V supply |
| 핀 23 | REF — 2.5 V reference output / bypass |
| 핀 24 | AIN — Analog input (±10 V for -1 version) |
| 핀 25 | NC — Not connected (per datasheet) |
| 핀 26 | NC — Not connected (per datasheet) |
| 핀 27 | NC — Not connected (per datasheet) |
| 핀 28 | NC — Not connected (per datasheet) |
일반적인 애플리케이션
AD7899ARS-1 적합 용도: 6 애플리케이션s: Industrial Data Acquisition Systems, Instrumentation and Test Equipment, Motor Control Feedback Loops, DSP Front-End Signal Processing, Process Control and SCADA, Embedded Measurement Modules.
Industrial Data Acquisition Systems
The AD7899ARS-1 fits industrial data acquisition with 14-bit resolution at 400 kSPS and ±10 V true bipolar input range. It converts transducer outputs from pressure, strain gauge, or temperature sensors into 14-bit digital codes via its SAR architecture, with 2.0 µs conversion time enabling multi-channel multiplexing throughput. The integrated track/hold amplifier and on-chip 2.5 V reference eliminate external conditioning components, and the parallel interface supports direct connection to microprocessors or DSPs without glue logic. Industrial-grade -40 C to +85 C operation ensures reliability in factory floor environments. Decoupling: 100 nF on each VDD pin and 10 µF on REF pin recommended.
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Instrumentation and Test Equipment
For instrumentation applications, the AD7899ARS-1 provides 14-bit accuracy at 400 kSPS with bipolar ±10 V input matching the output range of standard instrumentation amplifiers. The SAR architecture achieves excellent DC linearity, making it ideal for bench DMMs, oscilloscope digitizers, and spectrum analyzer IF digitizing where mid-speed precision is required. Its single +5 V supply simplifies power tree design in portable test equipment, and the parallel output bus allows direct connection to FPGA post-processing pipelines. The 2.0 µs conversion time and full ±10 V input range enable digitizing the full output swing of typical signal sources without signal conditioning. The on-chip 2.5 V reference provides stable conversion gain.
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Motor Control Feedback Loops
The AD7899ARS-1 converts motor phase current shunt amplifier outputs (typically ±10 V) into digital codes at 400 kSPS for closed-loop current control in industrial drives. With 2.0 µs conversion time, the SAR ADC fits well within typical 10-20 µs PWM cycle times for FOC algorithms, providing current feedback with deterministic latency. The ±10 V bipolar input matches standard current-sense amplifier output ranges such as AD820 or AD8418. The parallel interface enables real-time control processor reading without SPI/I2C overhead. The integrated track/hold amplifier captures instantaneous motor phase currents with low aperture jitter, critical for high-bandwidth torque control. Industrial-grade temperature range supports harsh drive cabinet environments.
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DSP Front-End Signal Processing
In DSP front-end designs, the AD7899ARS-1 provides 14-bit, 400 kSPS analog input for audio signal processing, vibration analysis, or sensor signal conditioning chains. The 14-bit dynamic range captures audio frequency content with 84 dB theoretical SNR (14-bit × 6.02 dB), adequate for pro-audio and industrial vibration monitoring. The parallel interface streams converted data directly to DSP or FPGA FFT processors at full 400 kSPS throughput without bus bottleneck. The on-chip track/hold amplifier and 2.5 V reference minimize external components, reducing board area and BOM cost. The single +5 V supply allows integration alongside standard digital logic supplies. Bipolar ±10 V input accommodates pre-amplified signal levels.
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Process Control and SCADA
The AD7899ARS-1 digitizes 4-20 mA loop-derived ±10 V or 0-10 V process variables (pressure, flow, temperature, level) into 14-bit codes for PLC and SCADA system input modules. The ±10 V input range directly accepts standard industrial signal levels without signal conditioning, and 400 kSPS throughput allows multiplexing multiple channels per ADC. SAR architecture provides deterministic conversion latency critical for control loop timing in PID controllers. The 28-SSOP package fits standard PLC form factors, and -40 C to +85 C operating range ensures reliability in unconditioned cabinet environments. The single +5 V supply aligns with industrial 24 V-to-5 V DC-DC converter rails.
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Embedded Measurement Modules
Embedded measurement modules such as load cell indicators, panel meters, and handheld test instruments use the AD7899ARS-1 to digitize transducer outputs with 14-bit accuracy. The ±10 V input range accommodates bridge amplifier outputs (typical ±5 V to ±10 V) directly, while the on-chip 2.5 V reference provides stable gain reference for load cell calibration. 400 kSPS throughput supports fast update rates for peak detection and transient capture in panel meters. The 28-SSOP package is footprint-compatible with hand-solderable prototyping boards. Single +5 V supply simplifies battery-powered designs when used with a boost converter. The parallel interface connects to low-cost microcontrollers without SPI peripherals.
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추천 제품 요약
엔지니어링 참조 데이터: AD7899ARS-1 — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | AD7899AR-1 | AD7899ARS-1REEL7 | AD7899ARS-2 | AD7899BR-1 | ADS8505IBDW |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Texas Instruments |
| Package | 28-SSOP (RS) | 28-SOIC (R) | 28-SSOP (RS) | 28-SSOP (RS) | 28-SOIC (R) | 28-SOIC (DW) |
| Resolution | 14 bit | 14 bit | 14 bit | 14 bit | 14 bit | 14 bit |
| Sampling Rate | 400 kSPS | 400 kSPS | 400 kSPS | 400 kSPS | 400 kSPS | 80 kSPS |
| Input Range | ±10 V | ±10 V | ±10 V | ±5 V | ±10 V | ±10 V |
| Supply Voltage | +5 V | +5 V | +5 V | +5 V | +5 V | +5 V |
| Interface | Parallel | Parallel | Parallel | Parallel | Parallel | Parallel / Byte |
| Internal Reference | 2.5 V | 2.5 V | 2.5 V | 2.5 V | 2.5 V | External required |
| Pin Count | 28 | 28 | 28 | 28 | 28 | 28 |
주요 차별점
- ±10 V true bipolar input range without external conditioning (vs ADS8505IBDW)
- Highest throughput in the AD7899 family at 400 kSPS (vs AD7899ARS-2)
- Compact 28-SSOP package footprint vs SOIC (vs AD7899AR-1)
설계 노트
The AD7899ARS-1 operates from a single +5 V supply (4.75 V to 5.25 V). Place a 100 nF ceramic decoupling capacitor close to each VDD pin (AVDD pin 22 and DVDD pin 20) and a 10 µF bulk capacitor on the supply rail. Analog and digital grounds should be joined at a single point near the ADC. Star grounding topology is recommended for noisy mixed-signal layouts.
The AD7899ARS-1 SAR ADC benefits from low source impedance on the analog input (≤50 Ω). For ±10 V input signals exceeding common-mode range, use a precision op-amp input driver such as AD8628 or AD8512. The on-chip 2.5 V reference requires a 10 µF external bypass capacitor on the REF pin to filter noise; inadequate bypassing will degrade AC performance and INL.
Do not exceed the absolute maximum analog input of ±15 V on AIN or the part may be damaged. The CONVST signal pulse width must satisfy the datasheet's minimum t1 timing parameter to start conversion reliably. Avoid driving capacitive loads on data outputs DB0-DB13; use a 74HC245 buffer if long PCB traces connect to a host bus. When migrating from SOIC AR-1 to SSOP ARS-1, verify the PCB land pattern matches SSOP (RS) dimensions.
Route the parallel data bus DB0-DB13 with matched lengths (within 50 mils) and series termination near the ADC outputs to avoid reflection on longer traces. Place the AD7899ARS-1 on the analog side of the board partition; the host microprocessor should be placed on the digital side, joined at the single AGND/DGND connection. The REF decoupling capacitor must connect directly to the REF pin and AGND with the shortest possible trace.
규정 준수 정보
RoHS compliant per Analog Devices product page. Industrial-grade -40 C to +85 C operating range. Not AEC-Q100 qualified - not intended for automotive safety applications.
