AD7848SQ

Overview

The AD7848SQ is a monolithic, high-speed 12-bit analog-to-digital converter (ADC) manufactured by Analog Devices. It integrates a fast successive approximation register (SAR) core with a built-in track-and-hold amplifier and a precision internal reference voltage source. The device operates on a single +5V power supply and features a serial interface compatible with standard SPI, QSPI, and MIC/DSP protocols. Key electrical specifications include a sampling rate of 200 kSPS, an input bandwidth of 3 MHz, and low power consumption of 60 mW. It is housed in an 8-pin CDIP package and supports an operating temperature range from -55°C to +125°C.

Feature Summary

• Integrated 12-bit SAR ADC with 200 kSPS sampling rate
• Built-in track-and-hold amplifier with 3 MHz input bandwidth
• On-chip precision reference voltage eliminates external components
• Serial I/O compatible with SPI, QSPI, and DSP standards
• Single +5V supply operation with 60 mW power dissipation

Applications

• Industrial process control systems
• Data acquisition modules
• Portable instrumentation
• Battery-powered measurement devices

Procurement Notes

Verify the specific suffix 'SQ' indicates the military/extended temperature grade (-55°C to +125°C) and ceramic DIP packaging. Confirm RoHS compliance status as older ceramic packages may have different regulatory classifications. Check for obsolescence or limited availability notices from Analog Devices, as this part number may be superseded by newer generations in the AD78xx family.

Selection Notes

Select the AD7848SQ when a single-channel, 12-bit resolution is required with a sampling rate up to 200 kSPS. The integrated reference simplifies design compared to parts requiring external references. Ensure the system interface matches the serial protocol requirements. For applications needing higher resolution or multiple channels, consider alternatives within the AD78xx series such as the AD7849 or AD7870.

Part Context

The AD7848 is part of the AD78xx family of high-speed, low-power A/D converters. This family is designed for applications requiring moderate speed and resolution with minimal external component count. The SQ variant specifically denotes the industrial/military temperature range and ceramic dual in-line package, distinguishing it from plastic surface-mount variants like the AR or AZ suffixes.

Replacement Considerations

Direct pin-compatible replacements within the same family include the AD7849 (12-bit, 200 kSPS) and AD7846 (12-bit, 100 kSPS). Verify that the replacement part's serial interface timing and reference configuration match the existing design constraints.