LTC1609IG#PBF

Analog To Digital Converters (ADC) Overview

The LTC1609IG#PBF is a 16-bit, 200ksps serial sampling analog-to-digital converter (ADC) from Analog Devices Inc. It operates on a single 5V supply and integrates a sample-and-hold circuit, precision reference, switched-capacitor successive approximation A/D core, and trimmed internal clock. The device supports multiple input ranges: unipolar (0V to 10V, 0V to 5V, 0V to 4V) and bipolar (–10V, –5V, –3.3V). Key electrical specifications include a typical signal-to-noise ratio (SNR) of 87dB, guaranteed no missing codes over temperature, and a maximum integral nonlinearity (INL) error of –2LSB. Power dissipation is typically 65mW with active conversion and reduces to 50mW in power-down mode.

Analog To Digital Converters (ADC) Feature Summary

• 16-bit resolution with 200ksps sampling rate and 87dB typical SNR
• Multiple input ranges: Unipolar (0-10V, 0-5V, 0-4V) and Bipolar (-10V, -5V, -3.3V)
• Integrated 2.5V precision reference with external reference capability
• Serial interface compatible with DSPs and microprocessors via CS, R/C, DATA, and DATACLK pins

Analog To Digital Converters (ADC) Applications

• Industrial process control systems
• Multiplexed data acquisition systems
• High-speed data acquisition for personal computers
• Digital signal processing applications

Analog To Digital Converters (ADC) Procurement Notes

Verify the package type matches the design requirements; the 'IG' suffix indicates a 28-lead SSOP package suitable for surface mount installation. Confirm that the industrial temperature range (-40°C to 85°C) aligns with the operational environment. Ensure the single 5V supply voltage is stable within the specified 4.75V to 5.25V limits to maintain accuracy. Check for RoHS compliance if required by the manufacturing standards.

Analog To Digital Converters (ADC) Selection Notes

Select this component when a high-resolution, low-power ADC with flexible input ranges is needed. The integrated reference simplifies board layout compared to external reference solutions. Consider the serial interface timing constraints when interfacing with high-speed processors. The 28-pin SSOP package offers a compact footprint but requires adequate thermal management given the 95°C/W junction-to-ambient thermal resistance.

Analog To Digital Converters (ADC) Part Context

The LTC1609 series serves as an improved second source for legacy parts like the ADS7809 and AD977A. It belongs to Linear Technology's family of serial sampling ADCs designed for cost-sensitive, space-constrained applications requiring 16-bit accuracy. The device bridges the gap between lower-speed, higher-resolution converters and faster, lower-resolution SAR ADCs.

Analog To Digital Converters (ADC) Replacement Considerations

Publicly confirmed substitutes include the ADS7809 and AD977A, which share functional similarities. Verify pin compatibility and electrical parameter margins before substitution, as interface timing and input impedance characteristics may differ slightly between generations.