LTC1609AISW#PBF

Analog To Digital Converters (ADC) Overview

The LTC1609AISW#PBF is a 16-bit, 200ksps serial sampling analog-to-digital converter (ADC) housed in a 20-lead plastic SO package. It operates from a single 5V supply with typical power dissipation of 65mW and 50mW in power-down mode. The device integrates a sample-and-hold circuit, precision reference, switched-capacitor SAR architecture, and trimmed internal clock. It 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 integral linearity error of –2LSB.

Analog To Digital Converters (ADC) Feature Summary

• 16-bit resolution with 200ksps sampling rate
• Multiple input ranges: Unipolar (0V to 10V/5V/4V) and Bipolar (–10V/–5V/–3.3V)
• Single 5V supply operation with 65mW typical power dissipation
• Integrated precision reference and sample-and-hold circuit
• Serial I/O interface with internal or external clock options

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 component status as the source material indicates potential discontinuation or limited availability for related variants. Confirm the specific ordering suffix matches the required industrial temperature range (-40°C to 85°C) and package type (20-lead SO). Ensure compatibility with existing board layouts due to pin configuration differences between 20-pin SO and 28-pin SSOP versions.

Analog To Digital Converters (ADC) Selection Notes

Select this ADC for applications requiring high DC accuracy with guaranteed no missing codes across the full operating temperature range. Consider the input impedance requirements (as low as 10kΩ) when designing the front-end driver circuitry. Utilize the offset and gain trim capabilities if absolute accuracy is critical, noting that factory trimming allows for external adjustment via dedicated pins.

Analog To Digital Converters (ADC) Part Context

The LTC1609 series serves as an improved second source for legacy components such as the ADS7809 and AD977A. It belongs to a family of serial sampling ADCs designed for ease of use with microprocessors and DSPs through its simple serial interface and control signals like BUSY and R/C.

Analog To Digital Converters (ADC) Replacement Considerations

Publicly confirmed substitutes include the ADS7809 and AD977A, which are noted as legacy parts for which the LTC1609 is an improved second source. Verify pinout compatibility and electrical parameter alignment before substitution.

Analog To Digital Converters (ADC) FAQ

What are the available analog input voltage ranges?

The LTC1609 supports three unipolar ranges (0V to 10V, 0V to 5V, 0V to 4V) and three bipolar ranges (–10V, –5V, –3.3V), configured via external resistor connections to R1IN, R2IN, and R3IN pins.

How is the output data format selected?

The SB/BTC pin determines the output format. Tying it high selects straight binary format, while tying it low selects two’s complement format.

Can the internal reference be bypassed?

Yes, the internal 2.5V reference can be overridden by driving the REF pin with an external reference voltage to achieve higher accuracy if needed.