AD7441BRT-R2 - 10-Bit 1MSPS Pseudo-Diff ADC | Analog Devices
MPN: AD7441BRT-R2 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.5 | $4.50 |
| 10 | $3.92 | $39.20 |
| 100 | $3.31 | $331.00 |
| 500 | $2.74 | $1,370.00 |
| 1,000 | $2.35 | $2,350.00 |
AD7441BRT-R2 Overview
A successive-approximation register (SAR) ADC is a converter architecture that performs a binary search through internal capacitive or charge-redistribution DACs to resolve the analog input one bit per clock cycle. ADCs in this class sit within the broader hierarchy of analog-to-digital converters -> data converters -> data acquisition ICs -> signal chain -> mixed-signal semiconductors. SAR ADCs are favoured when designers need deterministic latency, no pipeline delay, AC or DC accuracy in the 8-to-16-bit range, and the ability to be duty-cycled for low standby power.
Key features of the AD7441BRT-R2 include 1 MSPS throughput with throughput-dependent scaling of power dissipation, pseudo-differential analog input for ground-loop-tolerant single-ended measurements, low power consumption of 4 mW maximum at 1 MSPS with VDD = 3 V and 9.25 mW maximum at 1 MSPS with VDD = 5 V, a hardware-configurable analog input range of 0 V to VREF or 0 V to 2xVREF, and an integrated bandgap reference. The SOT-23-8 footprint places this 10-bit ADC into pad-constrained designs where QFN- or TSSOP-class packages would be too large.
The internal conversion is built around a charge-redistribution DAC array and a high-speed comparator, with the SAR control logic latching results into an internal register that is then shifted out through SCLK/SDATA over a four-wire serial link. Power consumption scales linearly with throughput, allowing designers to reduce conversion rate after acquisition to save energy in battery-powered monitoring loops. The pseudo-differential input stage measures IN+ relative to IN- and tolerates common-mode noise on the system ground, which is critical when digitising signals across isolation barriers or long sensor cables.
Typical applications for the AD7441BRT-R2 include industrial process-control front ends, battery monitoring for 12-to-48 V battery stacks, motor-control current-sense digitisation, handheld instrumentation, optical module monitoring, and general-purpose data-acquisition boards. Designers choose this ADC when a 10-bit result over an input range of a few volts is sufficient and PCB area is at a premium.
When designing with this part, evaluate the input bandwidth and acquisition time required by the sensor or signal source. The SOT-23-8 thermal envelope limits continuous 1 MSPS operation to lower duty cycles unless the analog input span is small; designers must provide proper decoupling on both VDD and REF pins and route the serial interface traces away from the analog input to avoid digital-coupling noise.
This page synthesises distributor pricing from DigiKey, Mouser, and Octopart alongside drop-in SAR ADC alternatives and practical design notes - offering actionable selection guidance beyond the manufacturer datasheet alone.
Drop-in alternatives for AD7441BRT-R2 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
AD7441BRTZ-REEL7
✅ Drop-In📋 Reference alternative (not in catalog)
AD7441BRT-REEL7
✅ Drop-In📋 Reference alternative (not in catalog)
AD7274BRTZ
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
AD7276BRMZ
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
AD7441BRT-R2 Maximum Ratings & Electrical Characteristics
| Resolution | 10 Bits |
| Number of Channels | 1 |
| Sampling Rate | 1 MSPS |
| Architecture | Successive Approximation (SAR) |
| Input Configuration | Pseudo-Differential |
| Analog Supply Voltage (VDD) | 2.7 V to 5.25 V |
| Power Dissipation | 4 mW max at 1 MSPS (VDD = 3 V); 9.25 mW max at 1 MSPS (VDD = 5 V) |
| Digital Interface | SPI, QSPI, MICROWIRE, DSP-compatible serial |
| Conversion Time | 16 us max |
| Input Range | 0 V to VREF or 0 V to 2xVREF (software configurable) |
| Internal Reference | 2.5 V (integrated) |
| Operating Temperature Range | -40 C to +85 C (industrial) |
| Package | SOT-23-8 (Tape and Reel, -R2) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| MSL (Moisture Sensitivity Level) | Level 1 |
AD7441BRT-R2 Pin Configuration
| Pin 1 | IN+ — Analog input, positive |
| Pin 2 | GND — Analog ground reference |
| Pin 3 | VDD — Analog supply voltage (2.7 V to 5.25 V) |
| Pin 4 | REF — Reference voltage input / internal 2.5 V bypass |
| Pin 5 | GND — Analog ground reference |
| Pin 6 | CS — Chip-select, active low |
| Pin 7 | SCLK — Serial clock input |
| Pin 8 | SDATA — Serial data output |
Typical Applications
AD7441BRT-R2 is suitable for 7 applications: Industrial Process Control Front End, Battery Stack Voltage Monitoring, Motor Control Current-Sense Digitisation, Handheld Test and Measurement Instrumentation, Optical Module Monitoring, General Purpose Data Acquisition Boards, Consumer Audio Volume Control Feedback.
Industrial Process Control Front End
The AD7441BRT-R2 suits industrial process-control analog front ends where 4-to-20 mA loop signals, thermocouple voltages, or 0-to-10 V sensor outputs must be digitised before a microcontroller or PLC decides on control action. The pseudo-differential input tolerates ground shifts across long field wiring, while the 10-bit resolution is adequate for setpoint tracking in PID loops and threshold alarms. The SOT-23-8 footprint allows the ADC to sit next to op-amp signal-conditioning stages on compact sensor-interface boards, and its 4 mW dissipation at 1 MSPS keeps total analog-board power low - critical in DIN-rail-mounted modules with limited airflow.
Recommended
Battery Stack Voltage Monitoring
Use the AD7441BRT-R2 to monitor individual cell voltages in 12 V, 24 V, and 48 V lithium-ion or lead-acid battery stacks. The 10-bit ADC provides sufficient resolution for cell balancing decisions, while the pseudo-differential input rejects common-mode ground noise induced by switching cells. Operating from a single 3.3 V supply, the part draws only 4 mW at 1 MSPS and can be duty-cycled to microamp-level standby currents between samples, preserving battery capacity. The compact SOT-23-8 package lets designers place a dedicated ADC directly on each cell-monitoring board for distributed battery-management architectures.
Recommended
Motor Control Current-Sense Digitisation
The AD7441BRT-R2 is well matched to digitising shunt-resistor current-sense signals in brushless DC (BLDC) and stepper-motor drives. The pseudo-differential input measures the small voltage drop across a low-side shunt directly, rejecting switching noise injected into the analog ground by the FET bridge. The 1 MSPS sample rate captures PWM-edge current transients at typical 20 kHz switching frequencies, while the 10-bit resolution enables current-loop control down to ~50 mA quantisation steps in a 5 V full-scale span. The 4 mW dissipation fits the thermal envelope of compact motor-driver boards.
Recommended
Handheld Test and Measurement Instrumentation
The AD7441BRT-R2 brings high-speed 10-bit measurement capability to handheld multimeters, oscilloscope probe interfaces, and portable data loggers. The SOT-23-8 footprint fits inside pen-style probe bodies, while the 1 MSPS capture rate supports transient-event recording of glitches on the analog input. The part's 4 mW dissipation at full rate extends battery runtime relative to older 12-bit ADCs with similar sample rates. Designers can chain multiple AD7441BRT-R2 devices on the same SPI bus to build multi-channel smart probes with sub-microsecond channel-to-channel skew.
Recommended
Optical Module Monitoring
Optical transceiver modules (SFP, SFP+, QSFP) need on-board monitoring of transmit-bias current, received optical power, and temperature to comply with SFF-8472 digital diagnostics. The AD7441BRT-R2 digitises photodiode signals from the receiver side and monitors MPD bias points on the transmitter side. The SOT-23-8 footprint is small enough to fit alongside an SFP cage, the pseudo-differential input tolerates ground shift between the host board and module, and the 10-bit resolution is sufficient for RSSI and TX-bias reporting in dBm.
Recommended
General Purpose Data Acquisition Boards
The AD7441BRT-R2 is a strong fit for multi-channel data acquisition (DAQ) boards targeting USB or PCIE interfaces. Each SOT-23-8 occupies minimal board area, allowing 8 or 16 channels of 10-bit acquisition on a single PCB. The 1 MSPS throughput delivers 1 million samples per second per channel, and the SPI interface lets designers parallel multiple ADCs off one microcontroller's serial port with chip-select decoding. Result data feeds directly into the host PC via USB bridges, enabling up to 100 kSPS aggregate throughput on cost-optimised measurement front ends.
Recommended
Consumer Audio Volume Control Feedback
The AD7441BRT-R2 can digitise potentiometer or rotary-encoder wiper voltages in audio amplifiers, AV receivers, and DJ mixers where the user expects fine-grained feedback on volume and tone positions. The pseudo-differential input rejects ground noise injected by switch-mode supplies inside consumer audio gear, while the 1 MSPS sample rate provides responsive feedback that feels instantaneous to the user. The 4 mW power dissipation keeps the part's impact on standby power low - critical for ENERGY STAR-rated consumer electronics - and the SOT-23-8 footprint fits the tight layout behind front-panel knobs.
Recommended
Recommended Products Summary
Engineering reference data for AD7441BRT-R2 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AD7441BRTZ-REEL7 | AD7441BRT-REEL7 | AD7274BRTZ |
|---|---|---|---|---|
| Package | SOT-23-8 | SOT-23-8 | SOT-23-8 | SOT-23-8 |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 10 bits | 10 bits | 10 bits | 12 bits |
| Max Sample Rate | 1 MSPS | 1 MSPS | 1 MSPS | 3 MSPS |
| Input Configuration | Pseudo-Differential | Pseudo-Differential | Pseudo-Differential | Pseudo-Differential |
| Supply Voltage Range | 2.7 V to 5.25 V | 2.7 V to 5.25 V | 2.7 V to 5.25 V | 2.7 V to 5.25 V |
| Interface | SPI / QSPI / MICROWIRE / DSP | SPI / QSPI / MICROWIRE / DSP | SPI / QSPI / MICROWIRE / DSP | SPI / QSPI / MICROWIRE / DSP |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
| RoHS | Yes | Yes | Yes | Yes |
Key Differentiators
- Smallest 10-bit 1 MSPS ADC package in ADI portfolio (vs AD7274BRTZ (12-bit/3 MSPS in SOT-23-8))
- Pseudo-differential input topology for ground-noise immunity (vs AD7476AAKSZ (SC-70-6 single-ended))
- Internal 2.5 V reference with software-selectable 2xVREF range (vs External reference designs (e.g. ADR01 + separate ADC))
Design Notes
Decouple the VDD pin with a 1 uF ceramic capacitor in parallel with a 100 nF X7R placed within 5 mm of the pin. The 4 mW/9.25 mW dissipation spec assumes a clean analog supply; switching noise from DC-DC converters on the same rail must be kept below 5 mV ripple for data-converter SNR.
When using the pseudo-differential input, the IN- pin must remain within +/-100 mV of GND to keep the input common-mode in range. Driving IN- with significant dynamic content forces offset errors at high sample rates; tie IN- to a clean analog ground reference for single-ended measurements.
Route the SPI serial interface traces (CS, SCLK, SDATA) on the digital side of the ground partition; route IN+, IN-, REF on the analog side. Avoid running digital traces underneath the SOT-23-8 ground pad - the exposed pad is the thermal/ground connection and must be solder-filled to the ground pour for thermal dissipation.
Source impedance at the analog input must be kept below 1 kohm to avoid acquisition-time errors at 1 MSPS. Higher source impedances increase the input RC settling time and produce gain error at full throughput; buffer the analog input with an AD8628 or similar low-offset op-amp when driving from high-impedance sources.
Compliance Information
RoHS compliant per the Analog Devices datasheet. Lead-free and halogen-free packaging. Not AEC-Q100 qualified; choose ADI's -Q-grade or -EP-grade parts for automotive applications.
