Texas Instruments ADS6245IRGZ25

Overview

ADS6245IRGZ25 from Texas Instruments is a dual-channel, 14-bit, 125 MSPS analog-to-digital converter with serialized LVDS outputs, simultaneous sample-and-hold architecture, and internal 3.3-V supplies. It delivers 73.4 dBFS SINAD at 10 MHz input, 79 dBc SFDR at 170 MHz with 3.5 dB coarse gain, and operates across –40°C to +85°C for base-station IF receivers and medical imaging front-ends.

For engineers reviewing the ADS6245IRGZ25 datasheet, ADS6245IRGZ25 pinout, ADS6245IRGZ25 application, or ADS6245IRGZ25 equivalent, key selection criteria include 125 MSPS sampling rate, 48-pin QFN package (7 mm × 7 mm), LVDS serial interface with programmable termination, dual-channel latency of 12 clock cycles, and support for internal/external reference modes.

Technical Context

The ADS6245IRGZ25 integrates two independent 14-bit ADC cores sharing a common PLL-based clock multiplier that generates bit and frame clocks from the input sampling clock. Its 2-wire LVDS output interface serializes each 14-bit channel over two differential pairs, halving data rate versus 1-wire mode and limiting bit rate to <1 Gbps.

It supports three configuration modes-parallel-only, serial-only, or hybrid-with priority resolution between CFG pins and register bits. Coarse gain (0 dB or 3.5 dB) and fine gain (up to +6 dB in 1-dB steps) are programmable to optimize SFDR/SNR trade-offs without external components.

Key Specifications

Pinout & Package

ADS6245IRGZ25 is housed in a 48-pin QFN package (RGZ designation), 7 mm × 7 mm, with exposed thermal pad. Pin functions are validated per TI SLAS542B Rev. December 2013.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS6245IRGZ25, ADS62P45IRGZT offers measurable SFDR/SINAD uplift in same footprint, while AD9680BCPZ-125 trades analog interface simplicity for digital protocol scalability-making ADS6245IRGZ25 optimal for cost-sensitive, space-constrained IF sampling where LVDS compatibility and minimal external components are prioritized.

Availability

ADS6245IRGZ25 is available at Aetrix Electronics and suitable for base-station IF receivers, medical ultrasound front-ends, and high-speed test equipment requiring stable component supply, long-term obsolescence planning, and industrial temperature grade assurance.

Supply support for ADS6245IRGZ25 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, embedded processing, and high-performance data converters for industrial, communications, and medical markets.

ADS6245IRGZ25 belongs to TI's ADS62XX dual-channel ADC family, engineered for high-density RF signal acquisition in wireless infrastructure and instrumentation where serial LVDS interface, low-latency synchronization, and flexible gain control are essential.

FAQ

What is the maximum sampling rate supported by ADS6245IRGZ25?

The ADS6245IRGZ25 supports a maximum sampling rate of 125 MSPS, validated across the full industrial temperature range (–40°C to +85°C). This rate is specified with AVDD = LVDD = 3.3 V, internal reference enabled, and 50% clock duty cycle. At this rate, the device achieves 73.4 dBFS SINAD and 79 dBc SFDR at 170 MHz input with 3.5 dB coarse gain. The ADS6245IRGZ25 maintains full 14-bit performance without missing codes up to its rated speed.

Does ADS6245IRGZ25 require external decoupling capacitors on its reference pins?

No, ADS6245IRGZ25 does not require external decoupling capacitors on its reference pins. The device integrates internal reference regulation circuitry that eliminates the need for external bypass capacitors on REFP/REFM. This design simplifies PCB layout, reduces component count, and improves reliability in high-density RF modules. The internal reference provides stable 1.0 V and 2.0 V rails, and the ADS6245IRGZ25 also supports external reference mode via the VCM pin when higher precision or custom voltage levels are needed.

How is channel synchronization achieved in ADS6245IRGZ25?

ADS6245IRGZ25 achieves channel synchronization through simultaneous sample-and-hold architecture and matched analog signal paths. Both ADC cores share the same sampling clock and PLL-derived timing resources, resulting in <±80 ps channel-to-channel aperture delay variation across temperature. Latency is fixed at 12 clock cycles for both channels, ensuring deterministic, time-aligned digital outputs. This synchronization is maintained regardless of gain setting, interface mode (1-wire/2-wire), or data format configuration-making ADS6245IRGZ25 suitable for I/Q demodulation and beamforming where phase coherence is critical.

Can ADS6245IRGZ25 operate with an external reference source?

Yes, ADS6245IRGZ25 supports external reference operation. When the SEN pin is biased at 0 V or (3/8)LVDD, the device disables its internal 1.0 V/2.0 V reference and accepts an external differential reference applied to the VCM pin (1.45 V to 1.55 V nominal). In this mode, full-scale input range becomes proportional to the external reference voltage, enabling system-level calibration and improved DC accuracy. The ADS6245IRGZ25 retains all other features-including LVDS serialization, programmable gain, and parallel configuration-when using external reference.

What LVDS interface options does ADS6245IRGZ25 support?

ADS6245IRGZ25 supports two LVDS interface configurations: 1-wire and 2-wire, selectable via CFG1 pin. In 2-wire mode, each channel's 14-bit data is serialized across two differential pairs (DA0/DA1 for Channel A, DB0/DB1 for Channel B), reducing bit rate to <1 Gbps and easing FPGA receiver design. In 1-wire mode, all data is transmitted over a single pair per channel. Both modes support DDR bit clock, programmable internal termination, and configurable data order (MSB/LSB first) and format (2's complement/offset binary)-all controllable via parallel pins or serial registers.