Analog Devices Inc. AD7277AUJZ-500RL7

Overview

AD7277AUJZ-500RL7 from Analog Devices is a 10-bit, 3.45 MSPS successive approximation ADC in a 6-lead TSOT package, operating from 2.35 V to 3.6 V supply. It delivers 60.5 dB SINAD at 1 MHz input, 74 MHz full-power bandwidth, and 0.5 LSB max DNL with no missing codes. It serves in high-speed sensor signal conditioning for industrial data acquisition systems requiring low power and compact footprint.

For engineers reviewing the AD7277AUJZ-500RL7 datasheet, AD7277AUJZ-500RL7 pinout, AD7277AUJZ-500RL7 application, or AD7277AUJZ-500RL7 equivalent, key selection criteria include throughput vs. SNR trade-off, TSOT-6 thermal performance (θJA = 230°C/W), SPI-compatible serial interface timing, and internal VDD-referenced 0–VDD analog input range.

Technical Context

The AD7277AUJZ-500RL7 implements a standard SAR architecture with no pipeline delay, using CS falling edge to initiate sampling and SCLK as both conversion clock and serial interface clock. Conversion completes in 12 SCLK cycles (250 ns max at 48 MHz), with track-and-hold acquisition time ≥60 ns.

Its internal reference is derived directly from VDD, enabling full-scale analog input range of 0 V to VDD without external reference components. The serial output format consists of two leading zeros, 10-bit conversion result (MSB first), and four trailing zeros - compatible with SPI, QSPI, MICROWIRE, and DSP interfaces.

Key Specifications

Pinout & Package

AD7277AUJZ-500RL7 uses a 6-lead TSOT (Thin Small Outline Transistor) package, 1.5 mm × 1.5 mm × 0.55 mm body, 0.5 mm pitch, exposed pad for thermal enhancement. Thermal impedance θJA = 230°C/W enables operation at full speed without forced airflow in compact enclosures.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 10-bit SAR ADC applications.

Compared with AD7277BRMZ-REEL and ADS7822U, AD7277AUJZ-500RL7 uniquely balances 3.45 MSPS throughput, 10-bit linearity, and 6-lead TSOT miniaturization - making it optimal for space- and power-constrained real-time signal capture where MSOP size or reduced speed is unacceptable.

Availability

AD7277AUJZ-500RL7 is available at Aetrix Electronics and suitable for industrial motor control, portable medical sensors, automotive cabin sensing, and test & measurement front-ends requiring stable component supply, long-term lifecycle support, and guaranteed TSOT-6 packaging consistency.

Supply support for AD7277AUJZ-500RL7 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.

The AD7276/AD7277/AD7278 family was designed for ultra-compact, low-power, high-speed data acquisition in space- and energy-constrained embedded systems - emphasizing minimal external components, single-supply operation, and robust industrial temperature performance.

FAQ

What is the maximum sampling rate supported by AD7277AUJZ-500RL7?

AD7277AUJZ-500RL7 supports a maximum throughput rate of 3.45 MSPS when operated with a 48 MHz SCLK. This is achieved in 12 SCLK cycles per conversion, yielding a minimum conversion time of 250 ns. The actual achievable rate depends on SCLK frequency, CS timing, and system-level interface overhead - but 3.45 MSPS is the guaranteed maximum under B-grade specifications at −40°C to +125°C.

Does AD7277AUJZ-500RL7 require an external voltage reference?

No, AD7277AUJZ-500RL7 does not require an external voltage reference. Its conversion reference is internally derived from the VDD supply rail, establishing a 0 V to VDD analog input range. This eliminates external reference components and associated layout complexity, though it means full-scale accuracy tracks VDD tolerance and noise - design considerations include tight VDD regulation and low-noise decoupling near the VDD pin.

What is the analog input voltage range for AD7277AUJZ-500RL7?

The analog input voltage range for AD7277AUJZ-500RL7 is 0 V to VDD, where VDD is supplied between 2.35 V and 3.6 V. This rail-to-rail input capability is enabled by the internal VDD-referenced architecture. Input overvoltage beyond VDD + 0.3 V or below −0.3 V violates absolute maximum ratings and may cause damage or latch-up - external clamping or series resistance is recommended for noisy or unprotected signal sources.

How does the serial interface of AD7277AUJZ-500RL7 work?

AD7277AUJZ-500RL7 uses a 3-wire SPI-compatible serial interface with CS, SCLK, and SDATA. Conversion starts on the falling edge of CS; data is clocked out MSB-first on SDATA's falling SCLK edges. The output frame is fixed: two leading zeros, ten data bits, and four trailing zeros. No separate read command is needed - data transfer is automatically synchronized to conversion completion, eliminating protocol overhead and ensuring deterministic timing.

Is AD7277AUJZ-500RL7 pin-compatible with other devices in the AD727x family?

Yes, AD7277AUJZ-500RL7 is pin-compatible with AD7276AUJZ-500RL7 and AD7278AUJZ-500RL7 in the same 6-lead TSOT package. All share identical pinout (VDD, GND, VIN, SCLK, SDATA, CS), electrical interface timing, and supply requirements. This enables resolution-scaling on the same PCB - swapping to 12-bit (AD7276) or 8-bit (AD7278) requires only firmware update, no hardware change.