LTC1099CSW#PBF

Analog To Digital Converters (ADC) Overview

The LTC1099CSW#PBF is a high-speed, microprocessor-compatible 8-bit analog-to-digital converter (ADC) manufactured by Analog Devices Inc. It features an internal sample-and-hold circuit that enables conversion rates up to the full Nyquist limit without external components. The device operates on a single 5V supply and offers a typical conversion time of 2.5µs in both Read (RD) and Write-Read (WR-RD) modes. Key electrical specifications include a maximum power dissipation of 75mW, a total unadjusted error of -1 LSB for the standard grade, and latched three-state digital outputs. The component is housed in a 20-lead Plastic Small Outline (Wide) package.

Analog To Digital Converters (ADC) Feature Summary

• Built-in Sample-and-Hold with 240ns acquisition time and 2.5V/ms tracking rate
• Latched Three-State Data Outputs for easy processor bus interfacing
• User-adjustable conversion time via TC pin (Pin 19)
• Overflow Output (OFL) allows cascading for higher resolution applications

Analog To Digital Converters (ADC) Applications

• Microprocessor-based data acquisition systems
• Two-quadrant analog multiplier configurations using DAC feedback
• TMS320C25 DSP interface designs
• Stand-alone conversion circuits requiring continuous output availability

Analog To Digital Converters (ADC) Procurement Notes

Verify the specific suffix 'SW' corresponds to the 20-lead Plastic Small Outline (Wide) package as defined in the datasheet ordering information. Confirm that the '#PBF' designation indicates lead-free compliance and RoHS adherence per manufacturer standards. Ensure the source documentation explicitly lists this part number variant to avoid confusion with other package types such as PDIP or SOIC.

Analog To Digital Converters (ADC) Selection Notes

Select the LTC1099CSW#PBF when an 8-bit resolution with a 2.5µs conversion speed is required for single-supply 5V applications. The internal sample-and-hold simplifies analog front-end design by eliminating external hold capacitors. Consider the WR-RD mode for edge-sensitive control or RD mode for processor-ready signaling. Verify that the input signal slew rate does not exceed the 2.5V/ms limit of the internal S/H circuitry.

Analog To Digital Converters (ADC) Part Context

The LTC1099 series utilizes a 2-step flash architecture, employing two 4-bit flash converters and a 4-bit DAC to achieve 8-bit accuracy with reduced hardware complexity compared to full flash architectures. This design reuses MS-Flash hardware for LS-Flash conversion, minimizing comparator count. The CSW suffix specifically identifies the wide small-outline package variant within the broader LTC1099 family which includes CN and IN package options.

Analog To Digital Converters (ADC) Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Designers should evaluate other ADCs from the Analog Devices portfolio, such as the LTC1274 or LTC1277, if higher resolution or different performance characteristics are required.