LTC1402IGN#TRPBF

Analog To Digital Converters (ADC) Overview

The LTC1402IGN#TRPBF is a 12-bit, 2.2Msps sampling analog-to-digital converter (ADC) from Analog Devices Inc., housed in a 16-lead narrow SSOP package. It features a high dynamic range sample-and-hold circuit and an internal 4.096V reference. The device operates on a single 5V supply or dual ±5V supplies, consuming 90mW in active mode. Key performance metrics include 72dB S/(N+D) and –89dB THD at Nyquist. It supports unipolar (0V to 4.096V) and bipolar (–2.048V) input ranges via the BIP/UNI pin. Power management includes Nap (15mW) and Sleep (10mW) modes with instant wake-up capabilities.

Analog To Digital Converters (ADC) Feature Summary

• High-speed 12-bit resolution with a maximum sampling rate of 2.2Msps.
• True differential inputs providing common mode rejection and flexible unipolar/bipolar operation.
• Integrated 4.096V precision reference with programmable gain settings.
• 3-wire serial interface compatible with DSPs, microcontrollers, and SPI/MICROWIRE protocols.

Analog To Digital Converters (ADC) Applications

• Telecommunications systems requiring high-speed data acquisition.
• Digitally multiplexed data acquisition systems.
• Spectrum analysis and digital radio receivers.
• Low power and battery-operated handheld instruments.

Analog To Digital Converters (ADC) Procurement Notes

Verify the specific suffix #TRPBF indicates tape and reel packaging when sourcing. Confirm the 'I' grade designation for the –40°C to 85°C industrial temperature range. Ensure compatibility with the required logic voltage levels (3V or 5V) for the OVDD pin before procurement.

Analog To Digital Converters (ADC) Selection Notes

Select this component for applications demanding high throughput and low power consumption. Use the Nap mode for frequent short bursts of activity to save energy while maintaining immediate readiness. Choose bipolar mode with dual supplies for optimal noise performance with op amps, or unipolar mode for single-supply simplicity.

Analog To Digital Converters (ADC) Part Context

This part belongs to the LTC1402 family of serial ADCs. The IGN#TRPBF designation specifies the Industrial temperature grade, Narrow SSOP package, and Tape & Reel packaging format. It is designed to replace older parallel ADCs in space-constrained designs due to its compact 16-pin footprint and serial interface.

Analog To Digital Converters (ADC) Replacement Considerations

When replacing legacy ADCs, ensure the new driver amplifier can settle within the 57ns acquisition time. Verify that the host processor's serial port timing matches the LTC1402's SCK and CONV requirements. Check if external reference buffering is needed if the internal VREF load exceeds specifications.

Analog To Digital Converters (ADC) FAQ

How does the BIP/UNI pin affect the input range?

Tying BIP/UNI to logic high sets bipolar mode with a –2.048V range, optimized for dual supplies. Tying it to logic low sets unipolar mode with a 0V to 4.096V range, suitable for single-supply systems.

What is the difference between Nap and Sleep modes?

Nap mode consumes 15mW and allows immediate conversion upon receiving clock pulses. Sleep mode consumes 10mW but requires a 10ms wait for the internal reference to settle after waking up, indicated by the REFREADY bit.

Can the internal reference be overdriven externally?

Yes, the VREF pin can be driven by an external source or a DAC output. When using an external reference, the GAIN pin should be tied to VREF to set the full-scale range appropriately.