Analog Devices Inc. AD7450ARMZ-REEL7

Overview

AD7450ARMZ-REEL7 from Analog Devices is a 12-bit, 1 MSPS successive approximation ADC with fully differential analog input, 3 V/5 V single-supply operation, and SPI/QSPI-compatible serial interface. It delivers 70 dB SINAD at 300 kHz input frequency, supports external reference voltage (100 mV–3.5 V), and achieves 3.75 mW max power at 833 kSPS with 3 V supply - ideal for battery-powered data acquisition and motor control systems.

For engineers reviewing the AD7450ARMZ-REEL7 datasheet, AD7450ARMZ-REEL7 pinout, AD7450ARMZ-REEL7 application, or AD7450ARMZ-REEL7 equivalent, key selection criteria include differential input bandwidth (20 MHz –3 dB), no pipeline delay, ±1 LSB DNL (B version), 8-lead SOIC package compatibility, and flexible reference scaling for transducer signal conditioning.

Technical Context

The AD7450ARMZ-REEL7 implements a charge redistribution SAR architecture with dual capacitive DACs and an integrated differential track-and-hold amplifier. Its conversion timing is fully synchronous to the SCLK input (15–18 MHz), with acquisition time ≤200 ns and aperture jitter of 50 ps - enabling precise sampling of fast-changing signals without latency artifacts.

It uses two's complement output coding, supports CS-controlled single-shot conversion initiation, and features variable common-mode voltage setup via external biasing of VIN+ and VIN– around VREF. The reference input directly defines full-scale span (2×VREF) and sets the input common-mode range per supply voltage (e.g., 1.25 V–3.75 V for 5 V VDD).

Key Specifications

Pinout & Package

AD7450ARMZ-REEL7 is housed in an 8-lead SOIC package (SOIC-8, body width 3.9 mm), RoHS-compliant, with standard JEDEC MS-012AC footprint and 1.27 mm pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7822U and AD7457BRMZ, AD7450ARMZ-REEL7 uniquely combines true differential input, 1 MSPS throughput, and 70 dB SINAD - making it the only option among the three suitable for high-fidelity, noise-immune acquisition of low-level AC-coupled transducer signals in compact industrial systems.

Availability

AD7450ARMZ-REEL7 is available at Aetrix Electronics and suitable for transducer interface, battery-powered systems, and motor control applications requiring stable component supply, long-term manufacturability, and guaranteed RoHS compliance.

Supply support for AD7450ARMZ-REEL7 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.

The AD7450 belongs to Analog Devices' precision SAR ADC product line, engineered for applications demanding high speed, low power, and differential input integrity - especially where noise immunity and signal fidelity are critical in harsh electrical environments.

FAQ

What is the maximum recommended reference voltage for AD7450ARMZ-REEL7 when operating from a 3 V supply?

The AD7450ARMZ-REEL7 supports an external reference voltage up to 2.2 V when powered from a 3 V supply, as specified in the References section of the datasheet. Exceeding this limit risks violating absolute maximum ratings and degrading INL/DNL performance. For optimal accuracy at 3 V, Analog Devices recommends using 1.25 V (±1%) as the nominal reference, which also defines the common-mode input range as VCM = 1.25 V ± VREF/2.

Does AD7450ARMZ-REEL7 support true differential input signals, and how is common-mode voltage established?

Yes, AD7450ARMZ-REEL7 features a fully differential analog input structure where VIN+ and VIN– accept complementary signals centered on a user-defined common-mode voltage (VCM). VCM is set externally - typically equal to VREF - and must fall within specified ranges (e.g., 1.25 V to 3.75 V for 5 V VDD). The device does not generate VCM internally; external biasing circuitry (e.g., resistor divider or op-amp buffer) is required to establish and stabilize VCM relative to GND.

What is the minimum quiet time required between serial read completion and the next CS falling edge for AD7450ARMZ-REEL7?

The AD7450ARMZ-REEL7 requires a minimum quiet time (tQUIET) of 25 ns between the end of a serial read operation and the next falling edge of the CS signal. This timing ensures proper bus release and prevents data corruption during consecutive conversions. The value is specified across the full temperature range (–40°C to +85°C) and is independent of supply voltage or SCLK frequency.

Can AD7450ARMZ-REEL7 operate with a 1.8 V digital interface while using a 3 V analog supply?

No, AD7450ARMZ-REEL7 does not support split-supply digital I/O. Its logic inputs (CS, SCLK) and output (SDATA) are referenced to VDD, which must be either 3 V (±10%) or 5 V (±5%). Input high voltage (VINH) is specified as 2.4 V min and input low voltage (VINL) as 0.8 V max - incompatible with 1.8 V logic families without level translation. All digital signaling must conform to the selected VDD voltage.

How does the power-down mode of AD7450ARMZ-REEL7 reduce system energy consumption?

The AD7450ARMZ-REEL7 enters full power-down mode when CS remains high and SCLK is inactive, drawing ≤1 µA typical supply current. This state disables the internal track-and-hold amplifier, reference buffer, and digital core - eliminating static and dynamic power dissipation. Recovery time is ≤1 µs, allowing rapid wake-up for burst-mode acquisition. In battery-powered systems, cycling between active conversion and power-down significantly lowers average current versus continuous operation.