Texas Instruments THS1401CPFB

Overview

THS1401CPFB from Texas Instruments is a 14-bit, 1 MSPS analog-to-digital converter with differential inputs, internal 2-V reference (REF+ = 2.5 V, REF− = 0.5 V), programmable gain amplifier (0–7 dB), and µP-compatible parallel interface. It operates from a single 3.3-V supply and supports power-down mode. Designed for xDSL front ends and high-speed DSP interfacing, it delivers 11.2-bit ENOB and −81 dB THD at 100 kHz input.

For engineers reviewing the THS1401CPFB datasheet, THS1401CPFB pinout, THS1401CPFB application, or THS1401CPFB equivalent, key selection considerations include its 1-MSPS sampling rate, TQFP-48 package, differential nonlinearity (±0.6 LSB typ), integral nonlinearity (±1.5 LSB typ), and timing compatibility with TMS320C6000 DSPs.

Technical Context

The THS1401CPFB implements a pipeline ADC architecture with 9.5-cycle latency and on-chip sample-and-hold. Its fully differential input stage accepts ±2-V differential range (IN+ − IN−) referenced to internal REF+/REF−, and supports three input configurations: fully differential, transformer-coupled, and AC-coupled single-ended.

It integrates a programmable gain amplifier (PGA) with 1-dB steps across 0–7 dB, offset compensation register (±128 LSB correction), and configurable output format (straight binary or 2's complement). Control logic uses A[1:0] address lines to access conversion result, PGA, offset, and control registers via the parallel interface.

Key Specifications

Pinout & Package

TQFP-48 package (PFB), 10 mm × 10 mm body, 0.5-mm pitch, 1.2-mm max height, exposed pad not electrically connected per datasheet.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed ADC applications.

Compared with THS1401CPFB, ADS8325IPFB trades speed for precision and eliminates internal reference dependency, while THS12082IPFB doubles throughput at the cost of 2-bit resolution and increased power-making THS1401CPFB optimal for balanced 1-MSPS, 14-bit, self-contained applications.

Availability

THS1401CPFB is available at Aetrix Electronics and suitable for xDSL front ends, industrial process monitoring, and automotive radar signal conditioning requiring stable component supply across commercial temperature range (0°C to 70°C).

Supply support for THS1401CPFB includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of expertise in high-performance data converters.

The THS1401CPFB belongs to TI's high-speed pipeline ADC product line, engineered for communication infrastructure and industrial systems demanding integrated signal conditioning, low-latency conversion, and DSP-friendly interfaces.

FAQ

What is the maximum clock frequency supported by THS1401CPFB?

The THS1401CPFB supports a maximum clock frequency of 1 MHz, as specified for the C-suffix variant in the Recommended Operating Conditions table. This defines its 1-MSPS sampling rate. Exceeding this frequency violates timing specifications and may cause data corruption or increased DNL/INL errors. The device is not rated for operation above 1 MHz, even if functional at marginal conditions.

Does THS1401CPFB require external reference components?

No, THS1401CPFB does not require external reference components for basic operation-it integrates a 1.5-V bandgap reference generating 2.5-V REF+ and 0.5-V REF− outputs. However, 0.1-µF capacitors are mandatory on REF+, REF−, and CML pins, and a 1-µF capacitor is required on VBG to ensure reference stability and low-noise performance.

How is the programmable gain amplifier (PGA) configured on THS1401CPFB?

The PGA on THS1401CPFB is configured by writing a 3-bit value (0–7) to bits G2–G0 of the PGA Gain Register (Address 1) via the parallel interface. Each increment corresponds to +1 dB gain, spanning 0–7 dB total. The gain setting directly scales the analog input before ADC conversion and affects full-scale range proportionally.

What is the function of the OV pin on THS1401CPFB?

The OV (Out-of-Range) pin on THS1401CPFB is an active-high, asynchronous indicator that asserts whenever the differential input voltage |IN+ − IN−| exceeds the reference span of ±2 V. It updates with the same 9.5-cycle pipeline delay as data outputs and is used for real-time overvoltage detection and automatic gain control loop feedback.

Can THS1401CPFB operate with a 5-V digital supply?

No, THS1401CPFB cannot operate with a 5-V digital supply. Absolute Maximum Ratings limit DVDD to 4 V, and Recommended Operating Conditions specify DVDD = 3.0–3.6 V. Applying 5 V violates electrical limits and risks permanent damage. It is strictly a 3.3-V interface device compatible with 3-V CMOS logic families only.