AD7274BRM - 12-bit 3 MSPS SAR ADC | Analog Devices | 8-MSOP
Teilenummer: AD7274BRM ✓ Aktiv| Menge | Stückpreis | Gesamt |
|---|---|---|
| 1 | $11.2 | $11,20 |
| 10 | $10.1 | $101,00 |
| 100 | $8.95 | $895,00 |
| 500 | $7.8 | $3.900,00 |
| 1.000 | $6.95 | $6.950,00 |
AD7274BRM Übersicht
A successive-approximation ADC (SAR ADC) is a type of analog-to-digital converter that converts an analog input signal to a digital output using a binary search algorithm through an internal capacitive DAC, comparator, and successive-approximation register. SAR ADCs sit in the broader hierarchy: ADC -> data converter -> mixed-signal IC -> semiconductor. They are favored over flash ADCs in moderate-speed, low-power, and high-precision applications because they balance speed, resolution, and power dissipation more efficiently.
Key features of the AD7274BRM include a low-noise, wide-bandwidth track-and-hold amplifier that handles input frequencies well beyond the Nyquist limit, a serial SPI-/QSPI-/MICROWIRE-/DSP-compatible digital interface for easy microcontroller and DSP hookup, and a hardware power-down pin that reduces quiescent current to microamp levels between conversions. The device typically draws only a few milliamps during continuous 3 MSPS operation, making it well-suited for battery-powered and portable instrumentation.
Architecturally, the AD7274BRM uses a charge-redistribution capacitive DAC core, which avoids the laser-trimmed resistor ladders required by some older SAR designs and improves linearity without calibration. The track-and-hold bandwidth exceeds the converter's Nyquist requirement, which means the AC performance remains accurate when digitizing wide-bandwidth signals such as those encountered in communications, imaging, and process control loops.
Typical applications include portable battery-powered data acquisition, industrial process and motor control, communications signal monitoring, optical-sensor front ends, and general-purpose precision instrumentation where a small-footprint, low-power, moderate-speed ADC is required.
When designing with the AD7274BRM, place the decoupling capacitor as close as possible to the AVDD pin and keep the analog input traces short and guarded, because the SAR front end is sensitive to high-frequency noise injected through the supply or reference pin. Use a low-impedance reference such as the ADR01 or ADR02 for best DC linearity.
This page synthesizes distributor pricing, drop-in same-package alternatives, application guidance, and design notes not aggregated on the Analog Devices product page or standard distributor listings.
Drop-in-Alternativen für AD7274BRM – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
Schnellvergleichstool – Wählen Sie Alternativbauteile für den Direktvergleich:
AD7274BRMZ
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
AD7274BRM-REEL
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
AD7273BRM
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
AD7273BRMZ
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
AD7475BRM
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
AD7274BRM Grenzwerte & elektrische Eigenschaften
| Auflösung | 12 bits |
| Architecture | SAR (Successive Approximation) |
| Number of Channels | 1 |
| Throughput Rate | 3 MSPS |
| Versorgungsspannung | 2.35 V to 3.6 V (single) |
| Input Type | Single-ended analog input |
| Digital Interface | SPI/QSPI/MICROWIRE/DSP-compatible serial |
| Gehäuse | 8-pin MSOP |
| Montageart | Surface Mount |
| Betriebstemperaturbereich | -40 C to +125 C |
AD7274BRM Pin-Konfiguration
| Pin 1 | VDD — Analog supply voltage (2.35V to 3.6V) |
| Pin 2 | GND — Analog ground |
| Pin 3 | REF — Reference voltage input |
| Pin 4 | AIN — Analog input |
| Pin 5 | GND — Analog ground (or AGND) |
| Pin 6 | CS — Chip select (serial interface) |
| Pin 7 | SCLK — Serial clock input |
| Pin 8 | DOUT — Serial data output |
Typische Anwendungen
AD7274BRM ist geeignet für 6 Anwendungs: Battery-Powered Data Acquisition, Industrial Process Control, Communications Signal Monitoring, Optical Sensor Front End, Motor Control Feedback, Portable Medical Instrumentation.
Battery-Powered Data Acquisition
The AD7274BRM's single 2.35V-3.6V supply and microamp-level hardware power-down current make it ideal for battery-powered data acquisition in handheld instruments and IoT sensor nodes. The 12-bit resolution (1 LSB = 0.0244% FS) is sufficient for most transducer front ends (temperature, pressure, strain gauge, and gas sensors) where the ADC digitizes a slow-moving analog signal. The 8-pin MSOP package keeps the analog front-end footprint minimal, while the 3 MSPS sample rate provides ample headroom for oversampling techniques that further improve SNR. Pair with a low-power op-amp such as the AD8628 for signal conditioning and an ADR435 reference for full 12-bit linearity.
Empfohlen
Industrial Process Control
The AD7274BRM is well-suited for industrial process control loops digitizing 4-20 mA or 0-10V transducer signals at moderate speeds. Its -40 C to +125 C industrial temperature range handles factory floor and outdoor cabinet environments, while the wide-bandwidth track-and-hold amplifier accurately captures rapidly changing control signals such as motor current and valve position feedback. The SPI-compatible serial interface simplifies connection to industrial microcontrollers and PLCs, and the 8-pin MSOP footprint is drop-in compatible with most PLC analog input modules. Recommended op-amp pair: AD822 for instrumentation-grade front-end gain, plus an ADR01 10V reference for high-linearity DC applications.
Empfohlen
Communications Signal Monitoring
The AD7274BRM's 3 MSPS throughput rate and wide-bandwidth track-and-hold amplifier make it a strong choice for communications signal monitoring tasks where baseband I/Q channels need to be digitized at moderate sample rates. The 12-bit resolution captures modulation envelopes with sufficient dynamic range for demodulation, while the SPI interface streams conversion results directly into a DSP or FPGA. The part's 2.35V-3.6V supply range aligns with modern low-voltage baseband processors, simplifying power-tree design. For narrowband IF digitizing, the AD7274BRM can sample at the Nyquist rate for signals up to ~1.5 MHz, suitable for many sub-GHz receiver chains.
Empfohlen
Optical Sensor Front End
The AD7274BRM is widely used in optical sensor front ends such as photodiode arrays, smoke detectors, and color-sensor modules where a fast, low-power 12-bit ADC digitizes the photodiode transimpedance amplifier output. Its wide-bandwidth track-and-hold amplifier captures rapid photodiode current pulses from pulsed-light sources, and the SPI interface reads conversion results with minimal microcontroller overhead. The 8-pin MSOP package fits small-form-factor optical modules, and the 2.35V-3.6V supply range matches single-cell Li-ion battery rails in portable spectrometers. Pair with an AD8015 transimpedance amplifier for high-bandwidth photodiode sensing, plus an ADR435 reference for full 12-bit linearity.
Empfohlen
Motor Control Feedback
The AD7274BRM digitizes motor control feedback signals such as phase current, back-EMF, and rotor position in BLDC and stepper motor drives. Its 3 MSPS throughput rate is well-matched to PWM switching frequencies in the 20-100 kHz range, allowing multiple current samples per PWM period for high-bandwidth torque control loops. The hardware power-down pin enables duty-cycled operation to reduce quiescent current in battery-powered robotic systems. The 8-pin MSOP package fits compact motor drive PCBs, and the SPI interface connects directly to motor control MCUs. Recommended companion parts include the ADuM3151 isolator for high-voltage drive isolation and the AD8418 current-sense amplifier.
Empfohlen
Portable Medical Instrumentation
The AD7274BRM is well-suited for portable medical instrumentation such as pulse oximeters, glucose meters, and ECG front-end modules where low power, moderate resolution, and small footprint are critical. Its 12-bit resolution is sufficient for vital-sign waveform digitization, and its wide-bandwidth track-and-hold handles pulse-shaped signals without distortion. The single 2.35V-3.6V supply range aligns with single-cell Li-ion battery rails used in wearable medical devices, and the microamp-level power-down current extends battery life between measurements. The 8-pin MSOP package fits wearable form factors. Recommended op-amp: AD8232 for ECG front-end, plus the ADR435 reference for full 12-bit linearity.
Empfohlen
Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für AD7274BRM – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | AD7274BRMZ | AD7274BRM-REEL | AD7273BRM | AD7273BRMZ | AD7475BRM |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | MSOP-8 | MSOP-8 - same | MSOP-8 - same | MSOP-8 - same | MSOP-8 - same | MSOP-8 - same |
| Resolution | 12 bits | 12 bits | 12 bits | 10 bits | 10 bits | 12 bits |
| Throughput Rate | 3 MSPS | 3 MSPS | 3 MSPS | 3 MSPS | 3 MSPS | 1 MSPS |
| Supply Voltage | 2.35V to 3.6V | 2.35V to 3.6V | 2.35V to 3.6V | 2.35V to 3.6V | 2.35V to 3.6V | 2.7V to 5.25V |
| Number of Channels | 1 | 1 | 1 | 1 | 1 | 1 |
| Architecture | SAR | SAR | SAR | SAR | SAR | SAR |
| Digital Interface | SPI/QSPI/MICROWIRE/DSP | SPI/QSPI/MICROWIRE/DSP | SPI/QSPI/MICROWIRE/DSP | SPI/QSPI/MICROWIRE/DSP | SPI/QSPI/MICROWIRE/DSP | SPI/QSPI/MICROWIRE/DSP |
| Operating Temperature | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +85C |
Wichtigste Unterscheidungsmerkmale
- Higher throughput rate at same package and supply voltage (vs. AD7475BRM)
- 12-bit resolution vs 10-bit alternatives (vs. AD7273BRM)
- Lower supply voltage range than comparable parts (vs. AD7475BRM)
- Wide industrial temperature range (vs. AD7475BRM)
Designhinweise
Place a 10 uF tantalum bulk capacitor and a 0.1 uF ceramic decoupling capacitor as close as possible to the VDD pin of the AD7274BRM. SAR ADCs draw fast transient currents during the internal DAC switching, and inadequate decoupling causes linearity errors that show up as degraded INL and DNL. Avoid sharing the ADC's VDD with noisy digital rails; use a ferrite bead or RC filter to isolate the analog supply from digital switching noise.
Use a low-impedance, low-noise external reference such as the ADR01, ADR02, ADR03, or ADR435 with the AD7274BRM. The reference voltage directly determines the ADC's full-scale range and DC linearity; a noisy or high-impedance reference degrades 12-bit performance. Place reference decoupling capacitors (typically 10 uF tantalum + 0.1 uF ceramic) directly at the ADC REF pin to suppress reference-induced noise.
Route the analog input trace as a short, guarded microstrip with the analog ground plane directly underneath. The SAR ADC's input sampling capacitor (typically a few pF) charges from this trace during acquisition, and long input traces introduce charge-sharing errors that appear as gain and linearity errors. Keep digital interface traces (CS, SCLK, DOUT) physically separated from analog input traces to prevent digital switching noise from coupling into the analog front end.
Drive the AD7274BRM's serial clock (SCLK) with a clean low-jitter source to avoid degrading SNR on a digital interface. Although SCLK does not directly affect analog accuracy, jitter on the chip-select timing or SCLK edge alignment can cause frame errors and missed conversions in continuous-sampling applications. For applications with multiple ADCs sharing a serial bus, ensure each ADC has its own dedicated CS line and adequate bus-isolation delays.
Compliance-Informationen
RoHS, REACH, AEC-Q100, lead-free, halogen-free, and conflict-minerals compliance not explicitly stated in the provided Verified Web Data. Refer to the Analog Devices AD7273/AD7274 datasheet for authoritative compliance statements. The BRM suffix historically denotes standard finish; the BRMZ suffix denotes RoHS-compliant lead-free finish.
