Analog Devices Inc. AD7452BRTZ-REEL7

Overview

AD7452BRTZ-REEL7 from Analog Devices is a 12-bit, successive approximation (SAR) analog-to-digital converter with fully differential input, 555 kSPS maximum throughput, 70 dB SINAD at 100 kHz, and operation from single 3 V or 5 V supply. It targets high-accuracy transducer interface and portable instrumentation where low power and wide input bandwidth are critical.

For engineers reviewing the AD7452BRTZ-REEL7 datasheet, AD7452BRTZ-REEL7 pinout, AD7452BRTZ-REEL7 application, or AD7452BRTZ-REEL7 equivalent, key selection considerations include differential input range scaling via external VREF (100 mV–3.5 V), no pipeline delay, SPI/QSPI/MICROWIRE-compatible serial interface, and 8-lead SOT-23 package constraints for space-constrained designs.

Technical Context

The AD7452BRTZ-REEL7 implements a charge redistribution SAR architecture with dual capacitive DACs and a differential track-and-hold amplifier supporting up to 3.5 MHz input bandwidth. Conversion is initiated on the falling edge of CS and clocked by SCLK, with 16-cycle serial readout (four leading zeros + 12-bit twos complement data).

It features flexible power management: full power-down mode draws ≤1 μA, and power scales directly with SCLK frequency-enabling dynamic throughput/power trade-offs. Reference voltage (VREF) sets both full-scale span (2 × VREF) and common-mode operating point, requiring matched source impedances on VIN+ and VIN– to avoid settling-induced DNL errors.

Key Specifications

Pinout & Package

AD7452BRTZ-REEL7 is housed in an 8-lead SOT-23 package (JEDEC MO-178AA), with exposed pad for thermal enhancement and compact PCB footprint (2.9 mm × 1.6 mm × 1.1 mm height). Pin 1 marked by dot; pinout follows standard SOT-23 orientation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7452BRTZ-REEL7, AD7451ARTZ-REEL7 trades 2 bits of resolution for 80% higher throughput in identical packaging, while ADS7822U sacrifices differential input capability and speed for TI's production ecosystem support-but requires additional components to match AD7452BRTZ-REEL7's integrated signal chain performance.

Availability

AD7452BRTZ-REEL7 is available at Aetrix Electronics and suitable for transducer interface, battery-powered systems, and data acquisition systems requiring stable component supply, long-term manufacturability, and guaranteed traceability.

Supply support for AD7452BRTZ-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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.

The AD7452BRTZ-REEL7 belongs to Analog Devices' precision SAR ADC product line, engineered for applications demanding high DC accuracy, low power, and robust AC performance in space- and energy-constrained environments.

FAQ

What is the maximum input frequency supported by the AD7452BRTZ-REEL7 before aliasing or distortion degrades performance?

The AD7452BRTZ-REEL7 has a full-power bandwidth of 20 MHz (–3 dB) and 2.5 MHz (–0.1 dB), but its usable small-signal AC performance is specified up to 100 kHz with 70 dB SINAD. For anti-aliasing compliance, input signals above 277.5 kHz (Nyquist for 555 kSPS) must be filtered; slew-rate-limited inputs >27 V/µs may cause conversion errors during acquisition.

Can the AD7452BRTZ-REEL7 operate with a 2.5 V reference when powered from a 3 V supply?

Yes-the AD7452BRTZ-REEL7 supports VREF from 100 mV to 2.2 V with a 3 V supply. While 2.5 V exceeds the recommended 2.2 V maximum for 3 V operation, it remains within absolute maximum rating (VREF ≤ VDD + 0.3 V = 3.3 V). However, specified performance (e.g., INL, SINAD) is only guaranteed at VREF = 2.0 V ±1% for 3 V supplies per datasheet Table 1.

Does the AD7452BRTZ-REEL7 require external clock circuitry beyond the SCLK signal?

No-the AD7452BRTZ-REEL7 uses the externally supplied SCLK signal both for serial data transfer and as the internal conversion clock source. No separate master clock or PLL is needed. The conversion time is fixed at 16 SCLK cycles (e.g., 1.6 µs at 10 MHz), and timing parameters such as tCONVERT and tQUIET are fully defined relative to SCLK edges.

How does the AD7452BRTZ-REEL7 handle common-mode voltage variations across temperature and supply?

The AD7452BRTZ-REEL7 derives its common-mode voltage (VCM) directly from VREF, which must be externally stabilized. Its CMRR is –70 dB at 100 kHz (Figure 6), meaning a 100 mV p-p common-mode interference induces ≤316 µV of error at the output. Performance remains stable across –40°C to +85°C (B-grade), with VREF drift and external buffer stability being the dominant contributors-not the AD7452BRTZ-REEL7 itself.

Is the AD7452BRTZ-REEL7 pin-compatible with other members of the AD745x family?

Yes-the AD7452BRTZ-REEL7 shares identical 8-lead SOT-23 pinout and function mapping with AD7451ARTZ-REEL7 and AD7453BRTZ-REEL7. All three support the same VDD, VREF, VIN+, VIN–, GND, CS, SCLK, and SDATA connections. However, AD7451 is 10-bit/1 MSPS and AD7453 is 12-bit/1 MSPS, so register timing and throughput differ despite mechanical and electrical pin compatibility.