LTC1297DCN8

ADCs/DACs - Special Purpose Overview

The LTC1297DCN8 is a single-chip 12-bit data acquisition system housed in an 8-lead plastic DIP (N8) package. It integrates a switched-capacitor successive approximation A/D converter, a differential input sample-and-hold on the positive terminal, and a serial I/O interface. Operating on a single 5V supply, it draws 6.0mA during active conversion and reduces to 5mA in power shutdown mode when idle. The device supports a maximum throughput rate of 60kHz with a clock frequency up to 1MHz. It features a direct three-wire synchronous interface compatible with most microprocessor serial ports.

ADCs/DACs - Special Purpose Feature Summary

• 12-bit resolution with differential analog inputs and built-in sample-and-hold
• Power shutdown capability reducing supply current to 5mA when CS is high
• Direct 3-wire serial interface for communication with MPU serial or parallel ports
• Single 5V supply operation with analog inputs common-mode to supply rails

ADCs/DACs - Special Purpose Applications

• Digitizing analog signals in remote applications requiring low interconnect count
• DSP applications utilizing fast conversion times and excellent AC characteristics
• Microprocessor-based data acquisition systems with limited I/O pins

ADCs/DACs - Special Purpose Procurement Notes

Verify the ordering suffix DCN8 corresponds to the 8-lead plastic DIP package and the 0°C to 70°C commercial temperature range. Confirm that the specific lot requires adherence to the recommended operating conditions, particularly regarding VCC bypassing with a minimum 22µF tantalum capacitor to maintain noise levels below 0.5mV. Ensure the source document matches the manufacturer's official datasheet for the LTC1297 series.

ADCs/DACs - Special Purpose Selection Notes

Select the LTC1297 over the LTC1292 if power consumption reduction during idle periods is required, as the LTC1297 automatically powers down when CS is high. Ensure the application can accommodate the 5.5ms wakeup time (tsuCS) before initiating data transfer. Verify that the microprocessor interface supports the synchronous half-duplex serial protocol or can emulate it via parallel port lines. Check that the source resistance allows for adequate settling within the sample period defined by tsuCS plus 0.5 CLK cycles.

ADCs/DACs - Special Purpose Part Context

The LTC1297 is part of the LTC1292/LTC1297 family of 12-bit data acquisition systems manufactured using LTCMOS switched-capacitor technology. While the LTC1292 operates continuously at up to 60kHz, the LTC1297 variant introduces power management features by entering a low-current shutdown state between conversions. Both devices share identical pinouts, resolution, and serial interface protocols, differing primarily in power consumption profiles and timing constraints related to the power-down cycle.

ADCs/DACs - Special Purpose Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. The datasheet notes the N8 package as obsolete and suggests considering alternate sources or packages, but does not list specific replacement part numbers.