Analog Devices Inc. AD7492ARZ

Overview

AD7492ARZ from Analog Devices is a 12-bit successive approximation analog-to-digital converter (SAR ADC) with internal 2.5 V reference and on-chip clock oscillator, operating from a single 2.7 V to 5.25 V supply. It delivers 1 MSPS throughput, 70 dB typical SNR at 100 kHz input, and 4 mW typical power at 3 V - enabling high-fidelity data acquisition in space-constrained industrial and instrumentation systems.

For engineers reviewing the AD7492ARZ datasheet, AD7492ARZ pinout, AD7492ARZ application, or AD7492ARZ equivalent, key selection considerations include its no-pipeline-delay architecture, flexible VDRIVE-controlled I/O voltage levels, dual sleep modes (full/partial), parallel 12-bit interface timing, and guaranteed no-missed-codes performance across −40°C to +85°C.

Technical Context

The AD7492ARZ implements a capacitive DAC-based SAR conversion core with track/hold amplifier supporting up to 10 MHz full-power bandwidth. Conversion is triggered by the falling edge of CONVST, with BUSY signaling completion after 880 ns (max), and no pipeline latency between sampling and result availability.

Its digital interface uses CS and RD to enable three-state parallel output drivers powered by VDRIVE - decoupling logic-level compatibility (e.g., 3 V microcontrollers) from analog supply (e.g., 5 V AVDD). Sleep mode selection (PS/FS pin) controls whether reference/oscillator remain active (partial sleep, 250 μA) or fully powered down (full sleep, 1 μA).

Key Specifications

Pinout & Package

AD7492ARZ is housed in a 24-lead SOIC package (body width 7.5 mm, JEDEC MS-013AC), with exposed pad not electrically connected. Pin functions are validated per Analog Devices Rev. A datasheet Figure 3 and Table 5.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7492BRZ, the AD7492ARZ trades minor linearity margin (±1.5 LSB vs. ±1.25 LSB) for broader commercial availability and lower unit cost; versus ADS7822U, it provides faster throughput, integrated reference/clock, and deterministic parallel timing - at the expense of interface flexibility.

Availability

AD7492ARZ is available at Aetrix Electronics and suitable for industrial process monitoring, portable test equipment, automotive sensor interface, and medical instrumentation requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for AD7492ARZ 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 for precision measurement and control.

The AD7492 product line delivers low-power, high-speed SAR ADCs optimized for space-constrained, battery-operated, and noise-sensitive applications where integration of reference, clock, and flexible I/O voltage is critical.

FAQ

What is the maximum sampling rate supported by the AD7492ARZ?

The AD7492ARZ supports a maximum throughput rate of 1 MSPS, corresponding to a minimum conversion time of 880 ns and track/hold acquisition time of 120 ns. This enables reliable sampling of input signals with bandwidths up to 400 kHz under Nyquist criteria. The AD7492ARZ achieves this rate using its internal clock oscillator - no external timing source is required for basic operation.

Does the AD7492ARZ require an external reference voltage?

No, the AD7492ARZ includes a precision 2.5 V internal reference with ±1.5% initial accuracy over temperature, available at the REF OUT pin. This eliminates the need for an external reference IC in most applications. The internal reference can also serve as a stable excitation source for ratiometric sensors or as a reference for external DACs, reducing system component count and layout complexity.

How does the VDRIVE pin function on the AD7492ARZ?

The VDRIVE pin on the AD7492ARZ supplies power to the digital I/O buffer circuitry and sets logic threshold levels (VINH = VDRIVE × 0.7, VINL = VDRIVE × 0.3) and output high voltage (VOH = VDRIVE − 0.2 V). This allows the AD7492ARZ to interface directly with 3 V microcontrollers while operating its analog section at 5 V - eliminating level shifters and maintaining timing integrity across mixed-voltage systems.

What sleep modes are available on the AD7492ARZ and how are they selected?

The AD7492ARZ supports two hardware-selectable sleep modes: partial sleep (250 μA max) and full sleep (1 μA max). Selection is made via the PS/FS pin - tied high (DVDD) for partial sleep (reference and oscillator remain active), tied low (GND) for full sleep (all analog circuitry powered down). Sleep is automatically entered when CONVST remains low after BUSY goes low, enabling ultra-low-power operation between conversions.

Is the AD7492ARZ pin-compatible with other variants in the AD7492 family?

Yes, the AD7492ARZ is pin-compatible with AD7492BRZ (same package and pinout) and shares identical pin configuration with AD7492-4 and AD7492-5 variants. However, throughput differs: AD7492-4 operates at 400 kSPS, AD7492-5 at 1.25 MSPS. Electrical characteristics such as INL and power consumption vary by grade and speed variant - always verify datasheet tables for the specific part number before substitution.