LTC1099CN#PBF

Analog To Digital Converters (ADC) Overview

The LTC1099CN#PBF is an 8-bit analog-to-digital converter (ADC) featuring a built-in sample-and-hold circuit and SAR architecture. It operates on a single 5V supply with a typical conversion time of 2.5µs, supporting input frequencies up to the Nyquist limit without external timing components. The device provides latched three-state parallel data outputs and includes an overflow output for cascading applications. Key electrical specifications include a maximum power dissipation of 75mW, a total unadjusted error of -1 LSB, and a tracking rate of 2.5V/ms. It is housed in a 20-lead PDIP package.

Analog To Digital Converters (ADC) Feature Summary

• Built-in Sample-and-Hold: Eliminates need for external S/H with 240ns acquisition time and 2.5V/ms tracking rate.
• Processor Compatible Interface: Supports Read (RD) and Write-Read (WR-RD) modes with edge-sensitive timing inputs.
• Latched Three-State Outputs: DB0-DB7 provide easy bus interfacing with high-impedance control via CS and RD signals.
• Cascading Capability: Overflow (OFL) output allows connection to higher-resolution ADCs for expanded dynamic range.

Analog To Digital Converters (ADC) Applications

• Microprocessor-based data acquisition systems requiring fast 8-bit digitization.
• Two-quadrant analog multipliers when paired with a DAC.
• Signal processing circuits utilizing the TMS320C25 DSP interface configurations.
• Applications requiring user-adjustable conversion times via the TC pin resistor network.

Analog To Digital Converters (ADC) Procurement Notes

Verify the component matches the Analog Devices part number LTC1099CN#PBF. Confirm the package is a 20-lead PDIP (Narrow 0.300 inch). Ensure the operating temperature range meets the requirement of 0°C to +70°C for the 'C' grade variant. Check that the datasheet specifies the standard 2.5µs conversion time unless modified by external resistance on Pin 19.

Analog To Digital Converters (ADC) Selection Notes

Select this component for applications needing a standalone 8-bit ADC with integrated sampling capabilities. The internal S/H simplifies analog front-end design by handling slew rates up to 2.5V/ms. Consider the WR-RD mode for processor interfaces where write-strobe initiation is preferred, or RD mode for read-triggered conversions. The fixed 2.5µs default conversion time suits most general-purpose low-speed ADC requirements.

Analog To Digital Converters (ADC) Part Context

This part belongs to the LTC1099 family of high-speed microprocessor-compatible ADCs. The 'CN' suffix indicates a plastic DIP package with commercial temperature range (0°C to 70°C). The '#PBF' suffix denotes lead-free finish and RoHS compliance. Related parts in the series include the LTC1099ACN (improved accuracy) and LTC1099I variants (industrial temperature range).

Analog To Digital Converters (ADC) Replacement Considerations

Direct replacements within the same family include LTC1099ACN#PBF for improved linearity (-0.75 LSB vs -1 LSB). For industrial temperature ranges, consider LTC1099IN#PBF or LTC1099AIN#PBF. Higher resolution alternatives from the manufacturer include the LTC1274 (12-bit) or LTC1406 (8-bit, faster speed), though interface and performance characteristics differ significantly.