Texas Instruments THS1408MPHPEP

Overview

THS1408MPHPEP from Texas Instruments is a radiation-tolerant, 14-bit, 3/8-MSPS analog-to-digital converter with integrated programmable gain amplifier (PGA), internal 2-V differential reference, and μP-compatible parallel interface. It operates from a single 3.3-V supply, supports −55°C to 125°C extended temperature range, and delivers 11.5-bit ENOB at 100 kHz input with 72 dB SNR - optimized for high-speed data acquisition in xDSL front ends and military-grade instrumentation.

For engineers reviewing the THS1408MPHPEP datasheet, THS1408MPHPEP pinout, THS1408MPHPEP application, or THS1408MPHPEP equivalent, key selection criteria include its dual-speed grade (3/8 MSPS), on-chip PGA (0–7 dB in 1-dB steps), differential input architecture, DSP timing compatibility with TMS320C6000, and QFP-48 package with separate analog/digital ground planes.

Technical Context

The THS1408MPHPEP implements a pipeline ADC architecture with 9.5-cycle latency and supports both straight binary and two's complement output formats via control register bit D11. Its fully differential input accepts ±2 V differential range referenced to internal REF+ (2.5 V) and REF− (0.5 V), with input impedance of 25 kΩ and 140 MHz analog bandwidth.

It integrates a digitally programmable PGA (0–7 dB gain, ±0.25 dB gain error), offset correction register (±128 LSB adjustment), and power-down mode reducing current to 20 μA. The device uses monolithic CMOS process, features 3-state parallel outputs (D[13:0] + OV), and requires external 0.1-μF capacitors on REF+/REF− and 1-μF on VBG for stable reference operation.

Key Specifications

Pinout & Package

THS1408MPHPEP is housed in a 48-pin HTQFP (PHP) package with 7 mm × 7 mm body, 0.5 mm pitch, and 1.2 mm max height. Pin layout separates analog and digital sections to minimize coupling; AGND/DGND pins are dedicated and non-interchangeable.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8588SIPM and AD9240ASTZ, THS1408MPHPEP uniquely combines 14-bit resolution, 8-MSPS speed, on-chip PGA, internal reference, and −55°C to 125°C operation in a single 3.3-V, QFP-48 package - eliminating four external components while maintaining DSP timing compliance.

Availability

THS1408MPHPEP is available at Aetrix Electronics and suitable for xDSL infrastructure, defense electronics, industrial analyzers, and automotive battery monitoring requiring stable component supply across extended temperature and long product lifecycles.

Supply support for THS1408MPHPEP 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 heritage in high-reliability data converters and DSP interface solutions.

The THS1408MPHPEP belongs to TI's enhanced-product (EP) precision ADC family, designed specifically for mission-critical applications demanding extended temperature operation, controlled manufacturing pedigree, and compatibility with TI's C6000 DSP platform.

FAQ

What is the maximum clock frequency supported by THS1408MPHPEP?

The THS1408MPHPEP supports a maximum clock frequency of 8 MHz, enabling its full 8-MSPS sampling rate. At this rate, it achieves 11.2-bit ENOB and 70 dB SNR at 1 MHz input frequency. Clock duty cycle must be maintained between 45% and 55%, and the device includes built-in pipeline latency of 9.5 clock cycles from sample to data output. THS1408MPHPEP also operates down to 0.1 MHz for low-power or synchronized multi-channel acquisition.

Does THS1408MPHPEP require external reference components?

No, THS1408MPHPEP includes a fully integrated reference system: a 1.5 V bandgap source (VBG), buffered 2.5 V positive reference (REF+), and 0.5 V negative reference (REF−), yielding a precise 2-V differential reference. External 0.1-μF capacitors are required on REF+/REF− to AGND and a 1-μF capacitor on VBG to AGND for stability. THS1408MPHPEP can optionally use an external reference by setting bit D12 (REF) in the control register to '1'.

How is the programmable gain amplifier (PGA) configured on THS1408MPHPEP?

The PGA on THS1408MPHPEP is configured by writing a 3-bit value (G2–G0) to address 1 (PGA register) via the parallel interface. Gain ranges from 0 dB to 7 dB in 1-dB increments (e.g., 000 = 0 dB, 111 = 7 dB), with ±0.25 dB gain error. The PGA is placed before the ADC core and affects both differential input range and noise floor. THS1408MPHPEP retains full 14-bit resolution across all gain settings, with DNL remaining within ±0.6 LSB typical.

What does the OV (Out of Range) pin indicate on THS1408MPHPEP?

The OV pin on THS1408MPHPEP asserts high when the differential analog input (IN+ − IN−) exceeds the valid range of ±2 V (i.e., |ΔIN| > ΔREF). It updates synchronously with the data outputs after the same 9.5-cycle pipeline delay. This flag enables real-time overvoltage detection in closed-loop systems - for example, triggering automatic gain reduction in xDSL line drivers or fault shutdown in battery monitors. THS1408MPHPEP does not clamp or limit the input; OV serves solely as a status indicator.

Can THS1408MPHPEP operate with a single 3.3-V supply for both analog and digital sections?

Yes, THS1408MPHPEP is specified to operate with AVDD = DVDD = 3.3 V (range 3.0 V to 3.6 V), but separate analog and digital ground planes (AGND and DGND) are mandatory to preserve AC performance. While supplies may share a common 3.3-V rail, TI's layout guidelines require physical separation of AGND/DGND pours with connection at a single point near the device. THS1408MPHPEP draws 90 mA analog current and 10 mA digital current at 3.6 V, totaling ~360 mW at 8 MSPS - power-down mode reduces total current to 20 μA.