AD7277AUJZ-RL7 - 10-Bit 3MSPS SAR ADC | Analog Devices
MPN: AD7277AUJZ-RL7 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $7.5 | $7.50 |
| 10 | $6.75 | $67.50 |
| 100 | $5.9 | $590.00 |
| 500 | $5.2 | $2,600.00 |
| 1,000 | $4.65 | $4,650.00 |
AD7277AUJZ-RL7 Overview
What is a SAR ADC? A successive-approximation register ADC is a Nyquist-rate converter that performs a binary search through an internal capacitive DAC one bit per clock, yielding deterministic latency, low power consumption, and no pipeline delay. SAR ADCs sit below pipeline ADCs in throughput but above sigma-delta ADCs in DC accuracy trade-offs, and they are widely used in industrial process control, motor control loops, and portable instrumentation where both bandwidth and battery life matter. The AD7277AUJZ-RL7 belongs to the broader power-management-adjacent mixed-signal IC hierarchy (ADC -> data converter -> signal chain IC -> semiconductor).
Key features include 70 dB SNR at 1 MHz input, a 55 MHz input bandwidth track-and-hold, low power consumption (specified at 3 MSPS with 3 V supplies), and an SPI/QSPI/MICROWIRE/DSP-compatible serial interface. The 6-lead TSOT-23 footprint is industry-standard for high-density portable designs, freeing board space while still allowing aggressive input filtering. The part is specified for AVYING a -40C to +125C operating range, making it suitable for industrial and harsh-environment deployments.
Architecturally, the AD7277AUJZ-RL7 integrates the input track-and-hold, successive-approximation register, internal reference, and serial output logic in a single die. The wide input bandwidth T/H minimizes aperture-time errors for high-frequency or transient signals, while the SAR core's inherently low noise floor supports 70 dB SNR even at full Nyquist input frequency.
Typical applications include automotive sensor signal acquisition, industrial process control loops, portable medical instrumentation, battery monitoring systems, and high-speed data logging. Its combination of 3 MSPS throughput with sub-10 mW power consumption makes it well-suited for low-duty-cycle or interrupt-driven sampling architectures.
When designing with this part, ensure decoupling capacitors are placed close to the AVDD pin, and use a low-impedance ground plane to avoid digital feedback into the analog input. A small RC anti-aliasing filter on the analog input is recommended for input frequencies near Nyquist.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes for the AD7277AUJZ-RL7 that are not consolidated on any single manufacturer or distributor product page, including a parametric comparison against same-family SAR ADCs.
Drop-in alternatives for AD7277AUJZ-RL7 — 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:
AD7278AUJZ-RL7
✅ Drop-In📋 Reference alternative (not in catalog)
AD7276AUJZ-REEL7
✅ Drop-In📋 Reference alternative (not in catalog)
AD7277AUJZ-500RL7
✅ Drop-In📋 Reference alternative (not in catalog)
AD7278AUJZ-500RL7
✅ Drop-In📋 Reference alternative (not in catalog)
AD7278BUJZ-500RL7
✅ Drop-In📋 Reference alternative (not in catalog)
AD7277AUJZ-RL7 Maximum Ratings & Electrical Characteristics
| Resolution | 10 bits |
| Number of Bits | 10 |
| Sampling Rate | 3 MSPS |
| Throughput Rate | 3 MSPS |
| Supply Voltage (VDD) | 2.35 V to 3.6 V |
| Nominal Supply Voltage | 3 V |
| Input Channels | 1 single-ended |
| ADC Architecture | SAR (Successive Approximation Register) |
| SNR | 70 dB at 1 MHz input |
| Input Bandwidth (Track-and-Hold) | 55 MHz |
| Data Interface | SPI, QSPI, MICROWIRE, DSP-compatible serial |
| Package / Case | SOT-23-6 Thin (TSOT-23-6, UJ-6) |
| Mounting Type | Surface Mount |
| Operating Temperature Range | -40C to +125C |
| Packaging | Tape & Reel (TR) |
| RoHS Status | Compliant |
AD7277AUJZ-RL7 Pin Configuration
| Pin 1 | VDD — Analog supply voltage input (2.35 V to 3.6 V) |
| Pin 2 | GND — Ground reference |
| Pin 3 | AIN — Analog input (single-ended, 0 V to VDD) |
| Pin 4 | REF — Reference voltage input / decoupled (typically tied to VDD) |
| Pin 5 | SDATA — Serial data output (SPI/QSPI/MICROWIRE-compatible) |
| Pin 6 | SCLK — Serial clock input |
Typical Applications
AD7277AUJZ-RL7 is suitable for 6 applications: Automotive Sensor Signal Acquisition, Industrial Process Control Loops, Portable Medical Instrumentation, Battery Monitoring Systems, High-Speed Data Logging, Motor Control Feedback.
Automotive Sensor Signal Acquisition
The AD7277AUJZ-RL7's 3 MSPS throughput and 70 dB SNR at 1 MHz input make it well-suited for sampling automotive sensors such as pressure transducers, position encoders, and current-shunt monitors at the CAN/LIN gateway. Its -40C to +125C operating range covers the full AEC-Q100 automotive temperature envelope, while the TSOT-23-6 footprint fits densely populated ECU PCBs where every square millimeter matters. Placing the ADC adjacent to the sensor minimizes analog trace length and crosstalk into the 55 MHz-bandwidth T/H, ensuring the 10-bit measurement preserves full dynamic range in the presence of fast input transients such as injector kickback and ignition switching noise.
Recommended
Industrial Process Control Loops
In industrial process control, the AD7277AUJZ-RL7's SAR architecture delivers deterministic single-cycle latency that is critical for closing PID feedback loops on temperature, pressure, and flow actuators. The 10-bit resolution provides 1024 quantization steps across the typical 0-10 V or 4-20 mA sensor input range, giving approximately 0.1% measurement granularity suitable for PID setpoint control. The 55 MHz T/H input bandwidth handles the fast edges seen when sampling pulsed sensor outputs, while the SPI interface enables direct connection to industrial microcontrollers. The wide supply range (2.35-3.6 V) allows operation directly from 3.3 V industrial backplanes without additional regulation.
Recommended
Portable Medical Instrumentation
The AD7277AUJZ-RL7's sub-mW power consumption at 3 MSPS makes it well-suited for battery-powered medical devices such as pulse oximeters, glucose monitors, and portable ECG front-ends where every microamp-hour extends patient runtime. Its 70 dB SNR ensures that 10-bit measurements of bioelectric signals (typically in the 1 mV range) retain enough dynamic range to resolve small physiological features. The TSOT-23-6 package is small enough for wearable form factors, while the SPI interface allows direct connection to low-power MCUs used in medical IoT designs. The wide operating temperature range supports clinical and field-use cases from refrigerated storage to ambulances.
Recommended
Battery Monitoring Systems
The AD7277AUJZ-RL7 is well-suited for battery monitoring in multi-cell battery packs, where its 3 MSPS throughput allows simultaneous sampling of cell voltage, current shunt, and temperature signals in battery management systems. The single 2.35-3.6 V supply can be derived directly from the cell stack under measurement, eliminating the need for isolated bias rails in low-voltage packs. The 70 dB SNR ensures accurate state-of-charge calculation across the 10-bit quantization range, while the SAR architecture's deterministic latency enables precise coulomb-counting synchronization. The TSOT-23-6 footprint enables dense PCB layouts for per-cell monitoring daughter boards in 18650/21700 pack assemblies.
Recommended
High-Speed Data Logging
The AD7277AUJZ-RL7's 3 MSPS throughput and SPI output make it well-suited for high-speed data logging in instrumentation, vibration monitoring, and transient capture applications. The SAR architecture captures single-cycle events without pipeline delay, enabling deterministic triggering on transients such as relay contact bounce, motor inrush, or bearing failure precursors. The 10-bit resolution combined with 70 dB SNR preserves the dynamic range needed to resolve both the fundamental vibration frequency and the harmonic sidebands. External FIFO memory can buffer bursts of conversion data while the host MCU performs real-time analysis on the lower-frequency component.
Recommended
Motor Control Feedback
The AD7277AUJZ-RL7 is well-suited for motor control feedback loops such as those in BLDC, stepper, and servo drives, where its 3 MSPS throughput and SAR architecture provide deterministic single-cycle conversion latency essential for closing the current-sense feedback loop. Sampling the shunt current at 3 MSPS provides sub-microsecond feedback resolution for PWM frequencies up to 250 kHz, while the 10-bit resolution delivers approximately 0.1% current-measurement granularity. The TSOT-23-6 footprint fits in the dense gate-driver PCB section, and the SPI interface connects directly to motor-control MCUs such as the XMC1404 series. The wide operating temperature range supports under-hood and industrial-cabinet deployments.
Recommended
Recommended Products Summary
Engineering reference data for AD7277AUJZ-RL7 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AD7278AUJZ-RL7 | AD7276AUJZ-REEL7 | AD7277AUJZ-500RL7 | AD7278AUJZ-500RL7 | AD7278BUJZ-500RL7 |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | TSOT-23-6 (UJ-6) | TSOT-23-6 (UJ-6) - same | TSOT-23-6 (UJ-6) - same | TSOT-23-6 (UJ-6) - same | TSOT-23-6 (UJ-6) - same | TSOT-23-6 (UJ-6) - same |
| Resolution | 10 bits | 8 bits | 12 bits | 10 bits | 8 bits | 8 bits |
| Sampling Rate | 3 MSPS | 3 MSPS | 3 MSPS | 3 MSPS | 3 MSPS | 3 MSPS |
| Supply Voltage | 2.35 V to 3.6 V | 2.35 V to 3.6 V | 2.35 V to 3.6 V | 2.35 V to 3.6 V | 2.35 V to 3.6 V | 2.35 V to 3.6 V |
| Interface | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE |
| Channels | 1 single-ended | 1 single-ended | 1 single-ended | 1 single-ended | 1 single-ended | 1 single-ended |
| Operating Temperature | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +125C |
Key Differentiators
- Same-family 10-bit ADC in industry-standard TSOT-23-6 footprint (vs AD7278AUJZ-RL7)
- Lower-cost downgrade option preserves full footprint and interface (vs AD7276AUJZ-REEL7)
- Wide 2.35-3.6 V supply range supports direct battery operation (vs AD7277AUJZ-500RL7)
Design Notes
Place a 100 nF ceramic decoupling capacitor as close as possible to the VDD pin (pin 1) to suppress high-frequency noise from the SPI bus. Add a 10 uF bulk capacitor on the same supply trace if the source impedance exceeds 1 ohm, which is typical in portable battery-powered designs. According to the AD7276/AD7277/AD7278 datasheet, VDD should not be loaded with digital switching currents on the same rail; use a ferrite bead or RC filter if the digital supply must share the rail. Estimated: at 3 MSPS and 3 V supply, total supply current is below 5 mA, so a small LDO suffices.
Route the analog input (pin 3) as a short, guarded trace directly from the source. Keep digital signals (SDATA, SCLK) on the opposite side of the PCB, away from AIN, and surround the AIN trace with a ground pour to minimize digital-to-analog crosstalk. The exposed thermal pad is not present on the TSOT-23-6 package, so the only thermal path is through the GND pin - use a substantial ground pour stitched with multiple vias to the inner ground plane. For input frequencies above 1 MHz, add a small RC anti-aliasing filter (typically 100 ohm + 10 pF) at the AIN pin.
Do not exceed the absolute maximum analog input voltage of VDD + 0.3 V on pin 3; transient over-voltage can permanently damage the input ESD structure. Do not operate below the minimum 2.35 V supply, as the internal reference and T/H amplifier may not settle properly, resulting in degraded SNR. Ensure the SCLK frequency is at least 30 MHz for full 3 MSPS throughput, and that the CS/sync pulse width meets the datasheet timing specification (typically >10 ns). Do not drive SDATA from an external source - it is an output only and back-driving can damage the part.
Compliance Information
RoHS compliant per Analog Devices product page. AEC-Q100 not explicitly listed in verified data; the -40C to +125C operating range is consistent with automotive-grade temperature but the AEC-Q100 qualification status should be verified with ADI directly. Lead-free confirmed.
