AD1671JQ

Overview

The AD1671JQ is a monolithic 12-bit, 1.25 MSPS analog-to-digital converter manufactured by Analog Devices Inc. It integrates a high-performance sample-and-hold amplifier (SHA) and an internal voltage reference within a single chip. The device utilizes a subranging flash conversion technique with digital error correction to ensure accuracy. It operates on ±5 V analog supplies and a +5 V logic supply, consuming 570 mW of power. The J-grade variant supports an operating temperature range of 0°C to +70°C and is housed in a 28-pin ceramic dual in-line package (CDIP).

Feature Summary

• 12-bit resolution with 1.25 MSPS throughput rate and 800 ns conversion time.
• Integrated on-chip sample-and-hold amplifier and 2.5 V voltage reference.
• Pin-configurable input ranges: 0–5 V, ±5 V, 0–2.5 V, or ±2.5 V.
• Guaranteed no missing codes over the full operating temperature range.

Applications

• High-speed data acquisition systems requiring precise signal digitization.
• Multiplexed measurement systems switching between negative and positive full-scale levels.
• Industrial instrumentation and process control applications.

Procurement Notes

Verify the specific suffix 'JQ' corresponds to the 28-pin CDIP package and the commercial temperature grade (0°C to +70°C). Confirm that the required linearity specification matches the J-grade tolerance of ±2.5 LSB integral nonlinearity. Ensure supply chain sources provide components screened for the specified operating conditions.

Selection Notes

Select the AD1671JQ when a complete monolithic solution is preferred over hybrid implementations to reduce system cost and improve reliability. Choose this model if the application requires pin-strapped input range configuration and does not need the extended temperature capabilities of the A or S grades. Verify that the 10 kΩ input resistance for ±5 V ranges meets the source impedance requirements.

Part Context

The AD1671 series represents a family of complete 12-bit sampling ADCs available in multiple performance grades and packages. The J-grade devices are screened for commercial operation, while the K-grade offers tighter linearity specifications. The Q suffix specifically denotes the ceramic dual in-line package construction, distinct from the plastic leaded chip carrier options available in the broader product line.

Replacement Considerations

Public confirmed substitute part numbers are not provided in the verified documentation. Designers should evaluate other Analog Devices 12-bit ADCs based on speed, resolution, and interface compatibility if the AD1671JQ is unavailable.

FAQ

How is the input voltage range configured on the AD1671JQ?

The input range is selected via pin strapping connections between AIN1, AIN2, SHA OUT, and BPO/UPO pins, supporting unipolar (0–5 V, 0–2.5 V) or bipolar (±5 V, ±2.5 V) configurations.

What is the function of the OTR pin?

The Out-of-Range (OTR) pin goes active HIGH when the analog input voltage exceeds the selected input range limits, indicating an overflow condition.

Does the AD1671JQ guarantee missing codes?

Yes, the AD1671JQ guarantees no missing codes over the full operating temperature range of 0°C to +70°C.