Texas Instruments ADS4145EVM

Overview

ADS4145EVM from Texas Instruments is an evaluation module designed to characterize the ADS4145 14-bit, 125-MSPS analog-to-digital converter under controlled signal, clock, reference, and power supply conditions. It supports transformer-coupled single-ended analog input (J6), external or onboard CDCE72010-derived clocking (up to 245.76 MHz), dual 1.8-V analog/digital supplies, and LVDS digital output capture via J10.

For engineers reviewing the ADS4145EVM datasheet, ADS4145EVM pinout, ADS4145EVM application, or ADS4145EVM equivalent, this page details jumper-configurable power options (LDO vs. switching regulator), clock routing paths (direct SMA, crystal-filtered LVCMOS, or differential LVPECL), analog input modes (transformer-coupled vs. THS4509-amplified), and TSW1400/HSDC Pro integration for FFT-based performance validation.

Technical Context

The ADS4145EVM implements a modular, jumper-driven architecture enabling hardware-level configuration of ADC operating conditions without firmware reprogramming. Power delivery supports three distinct topologies: TPS62562 switching regulator (high efficiency), TPS79618 LDO (low noise), or externally supplied isolated 1.8-V rails - each selected via JP13/JP14/JP17/JP19.

Clock routing includes three validated paths: direct 1.5-Vpp single-ended sine-wave injection at J19 (transformer-coupled to ADC), 245.76-MHz crystal-filtered LVCMOS output from CDCE72010's Y0 pin (fed by 20-MHz VCXO reference), or differential LVPECL output from Y1P/Y1N (bypassing filtering). Analog input supports either passive transformer coupling (J6 → T1/T2) or active amplification via THS4509 (powered at ±5 V across J9/J11).

Key Specifications

Availability

ADS4145EVM is available at Aetrix Electronics and suitable for high-speed data acquisition systems, communications test equipment, radar receiver front-ends, and instrumentation requiring stable component supply and rapid ADC characterization.

Supply support for ADS4145EVM 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 company headquartered in Dallas, Texas, specializing in analog, embedded processing, and high-performance data conversion technologies.

The ADS4145EVM belongs to TI's high-speed ADC evaluation platform family, engineered specifically to accelerate time-to-test for RF-sampling and wideband digitizer applications in defense, test & measurement, and communications infrastructure.

FAQ

What is the primary function of the ADS4145EVM?

The ADS4145EVM is a dedicated evaluation module for the ADS4145 14-bit, 125-MSPS analog-to-digital converter. It provides configurable analog input (transformer or THS4509-amplified), clock routing (direct, crystal-filtered LVCMOS, or differential LVPECL), power delivery (LDO or switching), and LVDS output capture - all via physical jumpers and surface-mount zero-ohm resistors. The ADS4145EVM enables repeatable, hardware-controlled validation of ADS4145 performance without custom PCB design.

Does the ADS4145EVM support both LDO and switching regulator power topologies?

Yes, the ADS4145EVM supports both topologies via jumper configuration. JP17 selects between TPS62562 (switching regulator, default) and TPS79618 (LDO); JP19 selects the corresponding 1.8-V output source. JP13 and JP14 route that 1.8-V rail to the ADC's analog (AVDD) and digital (DVDD) supplies. This allows direct comparison of SNR, SFDR, and power consumption trade-offs between low-noise and high-efficiency power delivery for the ADS4145EVM.

How is clocking configured on the ADS4145EVM?

Clocking on the ADS4145EVM is configured through jumpers and zero-ohm resistors. Default mode uses J19 for direct 1.5-Vpp single-ended clock injection (transformer-coupled to ADS4145). Alternative modes enable the onboard CDCE72010 clock buffer: R107 + R114 routes its crystal-filtered 245.76-MHz LVCMOS output (Y0) to the ADC, while R107 + R108 + R113 routes its differential LVPECL output (Y1P/Y1N). JP4 enables the VCXO, and JP1 controls CDCE72010 power-down - all documented in Table 2-4 of the ADS4145EVM user's guide.

Can the ADS4145EVM be used with the TSW1400 data capture board?

Yes, the ADS4145EVM is fully compatible with the TSW1400 high-speed data capture board via the J10 LVDS header. When connected, the TSW1400 automatically terminates each LVDS data pair, eliminating need for external 100-Ω resistors. HSDC Pro software supports device selection (ADS4145), FFT-based single-tone testing, and real-time capture parameter alignment (output data rate, input frequency). This integration is explicitly validated in Section 4 and Figure 5-1 of the ADS4145EVM user's guide.

What analog input configurations does the ADS4145EVM support?

The ADS4145EVM supports two analog input configurations: (1) transformer-coupled single-ended input via J6 using Mini-Circuits ADT4-1WT transformers (default, optimized for >100-MHz IF signals), and (2) active differential input via THS4509 operational amplifier (requires +5 V at J9 and GND at J11). Selection is made via R94/R98 (transformer path) or R95/R96/R99/R106 (amplifier path), as defined in Table 2-6. JP7 controls THS4509 power-down state.