AD7466BRT-R2 - 12-Bit 200kSPS Micropower ADC | Analog Devices
Teilenummer: AD7466BRT-R2 ✗ Abgekündigt| Menge | Stückpreis | Gesamt |
|---|---|---|
| 1 | $3.95 | $3,95 |
| 10 | $3.55 | $35,50 |
| 100 | $3.15 | $315,00 |
| 500 | $2.78 | $1.390,00 |
| 1.000 | $2.42 | $2.420,00 |
AD7466BRT-R2 Übersicht
What is a SAR ADC? A successive approximation register analog-to-digital converter is a precision data conversion IC that uses a binary search algorithm to resolve an analog input voltage into a digital code, one bit per clock cycle. SAR ADCs sit within the broader hierarchy: data-converter -> ADC -> precision converter -> signal chain IC. They are valued for high accuracy at moderate sample rates, low latency, deterministic conversion time, and very low power consumption, making them the workhorse of battery-powered and instrumentation applications.
Key features include a flexible serial interface compatible with DSP, MICROWIRE, QSPI, and SPI host controllers; an automatic power-down mode between conversions that drops quiescent current to under 1 microampere; and a wide 1.6 V to 3.6 V single-supply range. The SOT-23-6 footprint makes AD7466BRT-R2 one of the smallest precision 12-bit ADCs available, ideal for space-constrained designs. No external reference is required, simplifying BOM cost.
Technically, the AD7466BRT-R2 uses a switched-capacitor charge redistribution architecture with input sampling on the falling edge of CS and conversion driven by the external SCLK. The reference is internally tied to VDD, which trades absolute accuracy for simplicity and minimum external parts. Signal-to-noise-plus-distortion ratio (SINAD) tracks VDD, and integral nonlinearity (INL) and differential nonlinearity (DNL) are specified for industrial temperature grades.
Typical applications include portable and battery-powered measurement systems, medical instrumentation front-ends, remote and isolated data acquisition modules, optical sensor monitoring, and low-power industrial sensor interfaces. The part is widely used wherever a 12-bit conversion is sufficient and board area is critical.
A key design tip: the SCLK idle state must be set high to match the AD7466 logic convention, and the CS falling edge initiates both sampling and conversion - there is no separate sample/hold control. Bypass VDD with a 1 microfarad plus 100 nanofarad capacitor pair placed within 3 mm of the supply pin.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, giving engineers a single decision-ready reference for the AD7466BRT-R2.
Drop-in-Alternativen für AD7466BRT-R2 – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
Varianten dieser Serie
Modelle derselben Serie, die drop-in-kompatibel sind mit AD7466BRT-R2 (gleiche Bauform und Footprint) – abweichend in Architecture, Resolution, Operating Temperature, Package, Packaging.
Schnellvergleichstool – Wählen Sie Alternativbauteile für den Direktvergleich:
AD7466BRTZ-R2
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
AD7467BRT-R2
✅ Drop-In ⚠️ Spezifikationen ungeprüft📋 Referenzalternative (nicht im Katalog)
AD7468BRT-R2
✅ Drop-In ⚠️ Spezifikationen ungeprüft✓ Auf Lager
$2.18 / Stück
Datenblatt ansehen →ADC121S101CISD/NOPB
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
AD7476SRTZ-R2
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
AD7466BRT-R2 Grenzwerte & elektrische Eigenschaften
| Auflösung | 12 bits |
| Architecture | SAR (Successive Approximation Register) |
| Number of Channels | 1 |
| Sample Rate (Throughput) | 200 kSPS |
| Supply Voltage (VDD) | 1.6 V to 3.6 V (single supply) |
| Analog Input Range | 0 V to VDD |
| Reference Type | VDD (internal, no external ref required) |
| Data Interface | SPI, QSPI, MICROWIRE, DSP-compatible serial |
| Power Consumption (100 kSPS, 3 V) | 0.62 mW (typical) |
| Power Consumption (50 kSPS, 3.6 V) | 0.48 mW (typical) |
| Power Consumption (100 kSPS, 1.8 V) | 0.12 mW (typical) |
| Auto Power-Down Current | <1 microampere between conversions |
| Betriebstemperaturbereich | -40 C to +85 C (industrial grade) |
| Gehäuse | SOT-23-6 (RT suffix) |
| Montageart | Surface Mount |
| RoHS-Status | Compliant |
| Conversion Latency | 12 SCLK cycles after CS falling edge |
AD7466BRT-R2 Pin-Konfiguration
| Pin 1 | VDD — Positive power supply, 1.6 V to 3.6 V; also serves as the internal ADC reference |
| Pin 2 | GND — Ground return for supply and signal reference |
| Pin 3 | IN — Analog input; signal range 0 V to VDD, sampled on CS falling edge |
| Pin 4 | SDATA — Serial data output; 12-bit conversion result clocked out MSB-first |
| Pin 5 | SCLK — Serial clock input; must idle high, conversion completes in 12 SCLK cycles |
| Pin 6 | CS — Chip select, active low; falling edge initiates sampling and conversion |
Typische Anwendungen
AD7466BRT-R2 ist geeignet für 7 Anwendungs: Portable Battery-Powered Measurement, Medical Instrumentation Front-End, Remote Data Acquisition Modules, Isolated Data Acquisition, Optical Sensor Monitoring, Industrial Sensor Interface, Touch Sensor and Capacitive Sensing Digitizer.
Portable Battery-Powered Measurement
The AD7466BRT-R2's 0.62 mW typical power at 100 kSPS with 3 V supply, plus sub-microampere auto power-down between conversions, makes it ideal for direct Li-ion or 2xAA battery-powered measurement instruments. Its 1.6 V to 3.6 V supply range covers the full Li-ion discharge curve (3.6 V nominal to 3.0 V cut-off) without level shifting. Placed near the analog sensor with a 1 microfarad + 100 nanofarad bypass on VDD, it provides 12-bit resolution for handheld multimeters and field data loggers. Unlike higher-speed ADCs, the AD7466's micropower profile preserves battery runtime over weeks of standby sampling rather than hours.
Empfohlen
Medical Instrumentation Front-End
The AD7466BRT-R2 is widely used in medical instrumentation front-ends such as portable patient monitors, blood glucose meters, and pulse oximeters. The 12-bit resolution is sufficient for vitals-sign signal chains where the bandwidth rarely exceeds 1 kHz and the dynamic range is limited by the transducer itself. The SOT-23-6 footprint fits on a fingertip-sized PCB inside a wearable patch, and the micropower operation eliminates the need for thermal management. The internal VDD reference simplifies the analog front end to a single op-amp gain stage plus the ADC, reducing BOM cost for cost-sensitive consumer medical devices.
Empfohlen
Remote Data Acquisition Modules
For remote data acquisition modules installed in industrial sites, utility meters, or environmental stations, the AD7466BRT-R2 provides 12-bit precision at 200 kSPS in a tiny SOT-23-6 package, drawing minimal current from the battery or harvested power source. Its SPI interface connects directly to low-power microcontrollers such as the MSP430 or STM32L families, allowing system sleep current to be limited by the MCU rather than the ADC. The wide industrial temperature range (-40C to +85C) supports outdoor installations, and the small package simplifies conformal coating and encapsulation processes.
Empfohlen
Isolated Data Acquisition
The AD7466BRT-R2's SPI interface and low pin count make it ideal for isolated data acquisition across digital isolators. The ADC sits on the field side, converts the analog input, and clocks out the 12-bit result through an isolator such as the ADuM1411 or Silicon Labs Si8641. Because the ADC draws only 0.62 mW typical, the isolated DC-DC or transformer driver on the field side can be small and inexpensive. The 200 kSPS throughput is more than adequate for industrial process variables (temperature, pressure, flow) where 10-100 Hz sampling is typical.
Empfohlen
Optical Sensor Monitoring
In optical sensor monitoring applications such as ambient light sensors, proximity detectors, and smoke detector photoelectric chambers, the AD7466BRT-R2 digitizes the photodiode or phototransistor output with 12-bit resolution. Its 200 kSPS throughput captures fast light-level transitions, while the micropower profile is critical for battery-powered smoke alarms that must run for 10 years on a single battery. The 0 V to VDD input range maps directly to the photodiode transimpedance amplifier output, eliminating signal conditioning between the sensor and the ADC.
Empfohlen
Industrial Sensor Interface
The AD7466BRT-R2 serves as the ADC in industrial 4-20 mA current loop sensors, RTD temperature transmitters, and bridge sensor signal conditioners. Its 1.6 V to 3.6 V supply range supports loop-powered designs powered directly from the 4-20 mA loop drop voltage. The 12-bit resolution over 0 V to VDD provides 0.1% full-scale precision for typical process variable measurements. The SOT-23-6 footprint fits inside a standard industrial sensor head, and the SPI interface allows parameter storage and calibration through the same bus that the host MCU uses for HART or IO-Link communication.
Empfohlen
Touch Sensor and Capacitive Sensing Digitizer
The AD7466BRT-R2 can digitize capacitive touch sensor waveforms at up to 200 kSPS, providing 12-bit resolution for slider position or button force detection. Its micropower profile suits battery-powered touch interfaces in remote controls, wearables, and IoT devices where every microamp matters. The SPI interface allows direct connection to the touch-sensing host MCU without external glue logic, and the small package simplifies routing under a touch panel. The auto power-down between conversions drops quiescent current to negligible levels during idle states.
Empfohlen
Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für AD7466BRT-R2 – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | AD7466BRTZ-R2 | AD7467BRT-R2 | AD7468BRT-R2 | ADC121S101CISD/NOPB | AD7476SRTZ-R2 |
|---|---|---|---|---|---|---|
| Package | SOT-23-6 (RT) | SOT-23-6 - same | SOT-23-6 - same | SOT-23-6 - same | SOT-23-6 - same | SOT-23-6 - same |
| Brand | Analog Devices | Analog Devices - same | Analog Devices - same | Analog Devices - same | Texas Instruments - cross-brand | Analog Devices - same |
| Resolution | 12 bits | 12 bits | 10 bits | 8 bits | 12 bits | 12 bits |
| Sample Rate | 200 kSPS | 200 kSPS | 200 kSPS | 200 kSPS | 500 kSPS to 1 MSPS | 1 MSPS |
| Supply Voltage | 1.6 V to 3.6 V | 1.6 V to 3.6 V | 1.6 V to 3.6 V | 1.6 V to 3.6 V | 2.7 V to 5.25 V | 2.35 V to 5.25 V |
| Power at 100 kSPS | 0.62 mW @ 3 V | 0.62 mW @ 3 V | 0.62 mW @ 3 V | 0.62 mW @ 3 V | ~3.3 mW @ 3 V (estimated) | ~3.6 mW @ 3 V (estimated) |
| Auto Power-Down | Yes (<1 microampere between conversions) | Yes | Yes | Yes | Yes | Yes |
| Internal Reference | Yes (VDD) | Yes (VDD) | Yes (VDD) | Yes (VDD) | Yes (VDD) | Yes (VDD) |
| Lifecycle Status | NRND | Active | NRND | NRND | Active | Active |
Wichtigste Unterscheidungsmerkmale
- Lowest power consumption in SOT-23-6 12-bit ADC class (vs. ADC121S101CISD/NOPB)
- Same SOT-23-6 footprint across 8/10/12-bit family (vs. AD7468BRT-R2)
- Wider 1.6 V to 3.6 V supply range (vs. ADC121S101CISD/NOPB)
Designhinweise
Estimated: bypass VDD with a 1 microfarad X7R ceramic plus 100 nanofarad ceramic pair placed within 3 mm of the AD7466BRT-R2 supply pin. The 1 microfarad bulk handles transient current during SAR bit trials, and the 100 nanofarad high-frequency cap suppresses digital switching noise from SCLK transitions. A low-noise LDO (such as ADP160AUJZ-3.3) upstream prevents supply noise from coupling into the VDD-tied internal reference, which would directly degrade conversion accuracy.
Keep the analog input trace (Pin 3 IN) short and guarded with GND on both sides to minimize capacitive coupling from SCLK and SDATA traces. The SOT-23-6 pinout places the analog input (Pin 3) between digital pins (Pin 2 GND and Pin 4 SDATA), so use a ground fill under the package to isolate the analog input from digital switching. Estimated: trace capacitance 2-3 pF per inch; keep analog traces under 25 mm where possible to maintain full sample-rate linearity.
SCLK must idle HIGH to match the AD7466 logic convention - driving SCLK idle low can cause the first conversion to return incorrect data. CS is level-sensitive: a CS falling edge starts conversion immediately, so hold CS high between conversions to maintain the auto power-down state. Driving the analog input above VDD or below GND causes back-powering through the input ESD diodes, corrupting the conversion - add an external clamp or op-amp buffer if the source can exceed the supply.
Because the AD7466 uses VDD as the reference, the absolute accuracy of every conversion is bound by the cleanliness of the VDD rail. A switching DC-DC converter's residual ripple directly appears as gain error; a clean LDO is mandatory for any measurement requiring better than 1% absolute accuracy. For precision applications, measure VDD with an external reference (such as the ADR3630) and apply digital correction. The SAR architecture has no inherent noise rejection above Nyquist, so apply an RC antialiasing filter (typically 10 kilohm + 1 nanofarad) on the analog input.
Compliance-Informationen
Per Analog Devices product page, the AD7466BRT-R2 is RoHS compliant (Pb-free exemption applies to the -R2 reel suffix; the lead-free version is the AD7466BRTZ-R2). Not AEC-Q100 qualified - choose a different part for automotive designs.
