Texas Instruments ADS1605EVM

Overview

ADS1605EVM from Texas Instruments is an evaluation module for the ADS1605 16-bit, 5MSPS delta-sigma analog-to-digital converter. It enables rapid prototyping of high-precision data acquisition systems requiring ≥2.45MHz bandwidth, ±0.0025dB passband ripple, and ≤−99dB THD in scientific instrumentation and medical imaging applications.

For engineers reviewing the ADS1605EVM datasheet, ADS1605EVM pinout, ADS1605EVM application, or ADS1605EVM equivalent, this module provides verified signal integrity validation, TMS320C6000 DSP interface compatibility, on-board clock conditioning, and configurable reference selection-critical for validating SNR (88dB), SFDR (101dB), and linear-phase filter performance before production design.

Technical Context

The ADS1605EVM implements a fixed-oversampling-ratio (OSR=8) delta-sigma modulator sampling at 40MSPS, paired with a low-ripple linear-phase digital decimation filter delivering 5MSPS output with 2.45MHz −3dB bandwidth. Its architecture supports 2X mode (10MSPS) via external control and integrates an out-of-range monitor (OTR) and power-down (PD) functionality.

It interfaces directly to TI C6000 DSPs using a 16-bit parallel bus (DOUT[15:0]), accepts dual-supply operation (AVDD=+5V, DVDD/IOVDD=+2.7V to +5.25V), and supports both internal and external voltage references (2.5V–3.2V). The board includes RBIAS resistor adjustment for analog power scaling (315–570mW).

Key Specifications

Availability

ADS1605EVM is available at Aetrix Electronics and suitable for scientific instruments, automated test equipment, and medical imaging systems requiring stable component supply, traceable evaluation hardware, and validated ADC interface performance.

Supply support for ADS1605EVM 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 over 90 years of innovation in precision data conversion and signal chain solutions.

The ADS1605EVM belongs to TI's high-speed precision ADC evaluation platform family, designed specifically to accelerate development of metrology-grade data acquisition systems demanding >85dB SNR and <−95dB THD at multi-MSPS rates.

FAQ

What is the primary function of the ADS1605EVM?

The ADS1605EVM is an evaluation module for the ADS1605 16-bit, 5MSPS delta-sigma ADC. It provides a fully assembled, tested platform-including clock circuitry, reference options, and DSP-compatible interface-to validate dynamic performance (SNR, THD, SFDR), timing behavior, and system integration prior to custom PCB design. ADS1605EVM does not contain the ADC IC itself but hosts it as the core device under test.

Does the ADS1605EVM support both ADS1605 and ADS1606 devices?

No. The ADS1605EVM is specifically configured for the ADS1605, which lacks the FIFO buffer present in the ADS1606. Pin assignments and firmware are optimized for the ADS1605's non-FIFO interface timing (e.g., DRDY-driven read cycles without FIFO level signaling). Using an ADS1606 on this board would leave FIFO_LEV[2:0] pins unconnected and may cause undefined behavior during high-speed reads.

What reference options does the ADS1605EVM provide for the ADS1605?

The ADS1605EVM supports both internal and external reference configurations. It includes jumpers to enable the ADS1605's on-chip reference (REFEN = low) or connect an external 2.5V–3.2V source to VREFP/VREFN. The board also routes VMID and VCAP for bias stability, ensuring ≤50ppm/°C drift when using the internal reference-critical for temperature-sensitive calibration tasks.

How does the ADS1605EVM facilitate connection to TMS320C6000 DSPs?

The ADS1605EVM implements a direct 16-bit parallel interface matching the C6000's external memory interface timing: DOUT[15:0] maps to EMIF data lines, DRDY serves as ready signal, RD and CS align with strobe controls, and OTR connects to GPIO for overflow detection. All digital I/O operates at 3V logic levels (IOVDD = 3V), eliminating level-shifters required for C6000 interfacing.

Can the ADS1605EVM operate in 2X mode to achieve 10MSPS?

Yes. The ADS1605EVM exposes the 2XMODE digital input pin and includes a jumper to assert it high, reducing the oversampling ratio from 8 to 4 and doubling the output data rate to 10MSPS. This mode maintains the same 2.45MHz bandwidth but trades SNR (−1.5dB typical) and SFDR (−2dB typical) for throughput-verified in TI's SBAS274H characterization data.