Analog Devices Inc. AD7495BRZ

Overview

AD7495BRZ from Analog Devices is a 12-bit, 1 MSPS successive-approximation ADC with integrated 2.5 V reference, single-supply operation (2.7 V to 5.25 V), SPI-compatible serial interface, and 68 dB SINAD at 300 kHz input frequency. It serves as a high-speed analog front-end in portable instrumentation requiring low power and precise DC accuracy.

For engineers reviewing the AD7495BRZ datasheet, AD7495BRZ pinout, AD7495BRZ application, or AD7495BRZ equivalent, key selection criteria include on-chip reference stability (±50 ppm/°C), VDRIVE logic-level independence, no pipeline delay, and guaranteed no-missed-codes performance across −40°C to +85°C.

Technical Context

The AD7495BRZ implements a capacitive DAC-based successive-approximation architecture with track-and-hold acquisition time ≤325 ns for full-scale steps and aperture jitter of 50 ps typ. Conversion is initiated by CS falling edge and clocked by SCLK, requiring exactly 16 cycles at up to 20 MHz.

It features dual power domains: VDD powers analog core and conversion logic (2.7 V–5.25 V), while VDRIVE independently sets digital I/O voltage (2.7 V–5.25 V), enabling direct interfacing with 3 V or 5 V microcontrollers without level shifters.

Key Specifications

Pinout & Package

AD7495BRZ is housed in an 8-lead SOIC package (body width 3.9 mm, JEDEC MS-012), RoHS-compliant, with standard 1.27 mm pitch and exposed pad not present.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 12-bit SAR ADC applications.

Compared with AD7475BRZ and ADS8325IPW, the AD7495BRZ uniquely balances 1 MSPS speed, integrated reference, and sub-10 mW power-making it optimal for portable systems needing rapid, self-contained analog digitization without external reference design overhead.

Availability

AD7495BRZ is available at Aetrix Electronics and suitable for battery-powered medical instruments, industrial data acquisition modules, and optical sensor interfaces requiring stable component supply and long-lifecycle support.

Supply support for AD7495BRZ 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 semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing technologies.

The AD7495BRZ belongs to the AD7475/AD7495 family of micropower SAR ADCs designed for space-constrained, battery-operated applications demanding high throughput, low power, and simplified reference architecture.

FAQ

What is the reference voltage accuracy and temperature drift of the AD7495BRZ?

The AD7495BRZ provides an on-chip 2.5 V reference with output voltage specified from 2.4625 V to 2.5375 V (±1.5% initial tolerance) and a typical temperature coefficient of 50 ppm/°C. This allows stable operation across −40°C to +85°C without external trimming. The AD7495BRZ REF OUT pin must be decoupled with ≥100 nF to GND, and buffering is required before use as a system-wide reference.

Does the AD7495BRZ support true 1 MSPS continuous sampling?

Yes, the AD7495BRZ achieves a maximum throughput rate of 1 MSPS with a 20 MHz SCLK and proper timing margins. Its conversion time is fixed at 800 ns (16 SCLK cycles), and track-and-hold acquisition time is ≤325 ns for full-scale steps. To sustain 1 MSPS, the minimum quiet time (tQUIET) between conversions must be ≥100 ns, which is achievable with correct CS timing control.

Can the AD7495BRZ interface directly with a 3.3 V microcontroller while powered from 5 V?

Yes. The AD7495BRZ uses separate VDD (2.7 V–5.25 V for analog core) and VDRIVE (2.7 V–5.25 V for digital I/O) supplies. When VDRIVE = 3.3 V and VDD = 5 V, all digital pins (CS, SCLK, SDATA) operate at 3.3 V logic levels, enabling direct, level-shift-free connection to 3.3 V MCUs - a key feature confirmed in the AD7495BRZ datasheet timing and logic specifications.

Is the AD7495BRZ pin-compatible with the AD7475BRZ?

No. Although both share the same 8-lead SOIC/MSOP package and pin count, Pin 1 is REF OUT on the AD7495BRZ but REF IN on the AD7475BRZ. Swapping them without board revision causes functional failure: the AD7495BRZ expects no external reference on Pin 1, while the AD7475BRZ requires one. Layout changes are mandatory for substitution.

What is the guaranteed differential nonlinearity (DNL) specification for the AD7495BRZ?

The AD7495BRZ guarantees a differential nonlinearity of +1.5/−0.9 LSB maximum (B version) across −40°C to +85°C, ensuring no missing codes over the full 12-bit range. This DNL spec is explicitly stated in Table 2 of the AD7495BRZ datasheet Rev. D and is critical for applications requiring monotonic response, such as closed-loop motor control or safety-critical sensor monitoring.