AD1674ARZ

Overview

The AD1674ARZ is a monolithic 12-bit analog-to-digital converter (ADC) manufactured by Analog Devices Inc. It integrates a sample-and-hold amplifier (SHA), a 10 V reference, and three-state output buffers. The device operates with +5 V logic supply and ±12 V to ±15 V analog supplies. Key electrical parameters include a sampling rate of 100 kSPS, full power bandwidth of 1 MHz, and integral nonlinearity of ±1 LSB. It supports unipolar and bipolar input ranges including 0 V–10 V, 0 V–20 V, ±5 V, and ±10 V.

Feature Summary

• Integrated SHA supporting full Nyquist bandwidth without user wait-states
• Industry standard pinout compatible with AD574A and AD674A
• Flexible digital interface with 8- or 16-bit microprocessor compatibility
• Calibrated input ranges: 0 V–10 V, 0 V–20 V, ±5 V, ±10 V

Applications

• Signal processing systems requiring AC and DC specifications
• Traditional DC measurement applications
• Industrial control and automation data acquisition
• Portable instrumentation and medical ultrasound equipment

Procurement Notes

Verify the suffix 'RZ' corresponds to the plastic SOIC-28 package and RoHS compliance as per the ordering guide. Confirm the temperature grade matches application requirements; the 'A' grade specifies operation from –40°C to +85°C. Ensure power supply rails are within the specified limits of +11.4 V to +16.5 V for VCC and –16.5 V to –11.4 V for VEE.

Selection Notes

Select the AD1674ARZ when an industry-standard pinout is required for direct replacement of legacy AD574A/AD674A designs. Choose this model if the application demands a single-channel 12-bit ADC with integrated SHA and a parallel interface. Consider the A grade temperature range (–40°C to +85°C) for industrial environments. Verify that the system can provide the necessary ±12 V or ±15 V analog supplies alongside a +5 V logic supply.

Part Context

The AD1674 series utilizes Analog Devices’ BiMOS II process, combining high-performance bipolar analog circuitry with digital CMOS logic. The AD1674ARZ is part of the broader AD1674 family, which includes various temperature grades (J, K, A, B, T) and packages (Plastic DIP, Ceramic DIP, Plastic SOIC). It is designed for applications requiring both AC and DC performance specifications.

Replacement Considerations

The AD1674ARZ is pin-compatible with the AD574A and AD674A. When replacing these devices, ensure the new design accounts for the AD1674's internal SHA, which may alter timing requirements compared to converters without integrated sampling functions.

FAQ

How does the AD1674 handle input voltage ranges?

The AD1674 supports four calibrated input ranges via internal scaling resistors: 0 V to +10 V and 0 V to +20 V unipolar, and –5 V to +5 V and –10 V to +10 V bipolar.

What is the function of the STS pin?

The STS (Status) pin goes HIGH during conversion and LOW when the conversion is complete. It indicates when the output data buffers are valid and ready for reading.

Can the AD1674 operate in stand-alone mode?

Yes, in stand-alone mode, CE and 12/8 are wired HIGH, CS and A0 are wired LOW, and conversion is controlled solely by the R/C signal. This mode reduces aperture jitter.