THS1403CPFB

Analog To Digital Converters (ADC) Overview

The THS1403CPFB is a 14-bit, 3 MSPS analog-to-digital converter (ADC) manufactured by Texas Instruments. It operates on a single 3.3-V supply and features a monolithic CMOS design with an internal bandgap reference. The device includes a fully differential input stage, a programmable gain amplifier (PGA) offering 0 to 7 dB gain in 1-dB steps, and an on-chip sample-and-hold amplifier. It utilizes a µP-compatible parallel interface with three-state buffers for direct connection to data buses. The component is housed in a 48-pin TQFP (PFB) package and supports timing compatibility with high-performance DSPs such as the TMS320C6000 series.

Analog To Digital Converters (ADC) Feature Summary

• Features a pipeline architecture with a latency of 9.5 samples and a fully differential analog input structure.
• Includes an integrated programmable gain amplifier allowing adjustable signal amplification from 0 to 7 dB.
• Provides a µP-compatible parallel interface with three-state digital outputs for direct bus interfacing.
• Contains an internal bandgap voltage reference and dedicated registers for offset correction and control configuration.

Analog To Digital Converters (ADC) Applications

• xDSL front-end signal processing
• Communication system interfaces
• Industrial control data acquisition
• General-purpose instrumentation

Analog To Digital Converters (ADC) Procurement Notes

Verify the specific suffix 'CPFB' corresponds to the commercial temperature range (-40°C to 85°C) and TQFP-48 packaging. Confirm that the internal reference mode is enabled via the control register if external references are not utilized. Ensure power supply decoupling capacitors are placed near AVDD and DVDD pins to maintain signal integrity.

Analog To Digital Converters (ADC) Selection Notes

Select this model when a 14-bit resolution at 3 MSPS sampling rate is required within a single 3.3-V supply constraint. Consider the THS1401 or THS1408 variants if lower or higher sampling speeds are needed. Evaluate the PGA functionality to determine if on-chip amplification reduces the need for external signal conditioning components.

Analog To Digital Converters (ADC) Part Context

The THS1403 belongs to the THS140x family of 14-bit ADCs, which also includes the THS1401 (1 MSPS) and THS1408 (8 MSPS). These devices share identical pinouts, register maps, and architectural features, differing primarily in their maximum clock frequencies. This family was designed specifically for high-speed DSP applications requiring low power consumption and high performance.

Analog To Digital Converters (ADC) Replacement Considerations

The THS1401CPFB and THS1408CPFB are functionally compatible alternatives within the same package and pinout. They differ only in maximum sampling speed specifications. No other cross-manufacturer replacements are confirmed in the provided documentation.

Analog To Digital Converters (ADC) FAQ

How is the output format configured?

The output format can be set to either straight binary or two's complement by writing to the FOR bit (D11) in the Control Register (Address 3).

What is the purpose of the OV pin?

The OV (Out-of-Range) output indicates when the differential analog input voltage exceeds the differential reference voltage. It is updated with the same pipeline delay as the digital data outputs.

Can the internal reference be disabled?

Yes, the internal bandgap reference can be disabled by setting the REF bit (D12) to 1 in the Control Register, allowing an external precision reference to be applied to the VBG pin.