Texas Instruments ADS6145IRHBR

Overview

ADS6145IRHBR from Texas Instruments is a 14-bit, 125 MSPS analog-to-digital converter with DDR LVDS or parallel CMOS outputs, internal reference, programmable coarse/fine gain, and clock duty cycle stabilizer. It delivers 73.7 dBFS SINAD at 10 MHz input and 78 dBc SFDR at 170 MHz with 3.5 dB gain, targeting high-speed data acquisition in radar and SDR systems.

For engineers reviewing the ADS6145IRHBR datasheet, ADS6145IRHBR pinout, ADS6145IRHBR application, or ADS6145IRHBR equivalent, key selection criteria include sampling rate headroom (125 MSPS), LVDS/CMOS interface flexibility, 3.3-V analog / 1.8–3.3-V digital supply compatibility, and QFN-32 package thermal performance (θJA = 34 °C/W).

Technical Context

The ADS6145IRHBR employs a high-bandwidth sample-and-hold circuit and low-jitter clock buffer to maintain 73.7 dBFS SINAD and 90 dBc SFDR at 10 MHz input. Its dual-output architecture supports either DDR LVDS (3.3-V DRVDD, 100-Ω termination) or parallel CMOS (1.8–3.3-V DRVDD), with programmable output clock position and drive strength for timing margin optimization.

Coarse gain (0 or 3.5 dB) and fine gain (0–6 dB) are configurable via 3-wire serial interface or dedicated parallel pins (SCLK/SEN/SDATA), enabling SNR/SFDR trade-offs at reduced full-scale input ranges. Internal reference eliminates external decoupling; external reference mode supports 1.45–1.55 V common-mode voltage.

Key Specifications

Pinout & Package

ADS6145IRHBR uses a 32-pin QFN package (RHB designation) with 0.5-mm pitch and exposed thermal pad. Pin functions align with the ADS614X family pinout per TI SLWS198B datasheet Figure 9.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS6144IRHBR and ADS5500IPAP, ADS6145IRHBR uniquely combines 125 MSPS sampling, DDR LVDS output, and integrated reference in a compact 5×5 mm QFN-reducing BOM count and PCB area while maintaining SFDR performance above 78 dBc at RF frequencies.

Availability

ADS6145IRHBR is available at Aetrix Electronics and suitable for radar systems, software-defined radio infrastructure, and test equipment requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for ADS6145IRHBR 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.

The ADS6145IRHBR belongs to TI's high-speed data converter product line, engineered for demanding RF sampling applications including radar, wireless infrastructure, and instrumentation where SNR, SFDR, and interface flexibility are critical.

FAQ

What is the maximum sampling rate supported by the ADS6145IRHBR?

The ADS6145IRHBR supports a maximum sampling rate of 125 MSPS, as specified in its datasheet under recommended operating conditions. This rate is achievable with proper clock signal integrity, 50% duty cycle (stabilized internally), and compliance with input clock amplitude requirements (e.g., ≥400 mVPP differential). At this rate, the ADS6145IRHBR maintains 73.7 dBFS SINAD and 90 dBc SFDR at 10 MHz input frequency.

Does the ADS6145IRHBR require external decoupling capacitors for its internal reference?

No, the ADS6145IRHBR does not require external decoupling capacitors for its internal reference. The device integrates a precision internal reference (VREFB = 1 V, VREFT = 2 V) with ±20 mV error, and TI explicitly states "No External Decoupling Required for References" in the datasheet features. This eliminates four external capacitors and simplifies layout, though proper AVDD/AGND decoupling remains essential for analog performance.

Can the ADS6145IRHBR operate with both LVDS and CMOS digital outputs?

Yes, the ADS6145IRHBR supports both DDR LVDS and parallel CMOS digital outputs, selectable via the SEN pin or serial interface register 0x04. LVDS mode requires DRVDD = 3.3 V and 100-Ω differential termination, while CMOS mode supports DRVDD = 1.8–3.3 V with programmable drive strength. The interface choice is mutually exclusive per power-up configuration and affects pin loading, power consumption (417 mW LVDS vs. 625 mW CMOS at 3.3 V), and FPGA I/O resource usage.

What is the purpose of the coarse and fine gain settings in the ADS6145IRHBR?

The coarse (0 or 3.5 dB) and fine (0–6 dB) gain settings in the ADS6145IRHBR adjust the full-scale input range to optimize SFDR performance at lower analog input amplitudes. For example, applying 3.5 dB coarse gain reduces full-scale differential input from 2 VPP to 1.34 VPP, improving SFDR by 4 dB at 170 MHz (78 dBc → 82 dBc for ADS6144). These gains are configured via SCLK/SEN pins or serial interface register 0x00, enabling dynamic adaptation to signal chain headroom constraints.

Is the ADS6145IRHBR pin-compatible with other devices in the ADS614X family?

Yes, the ADS6145IRHBR is pin-compatible with ADS6144IRHBR, ADS6143IRHBR, and ADS6142IRHBR within the same QFN-32 (RHB) package. All share identical pinout, power domains (AVDD/DRVDD), interface signals (INP/INM, CLKP/CLKM, LVDS/CMOS data pairs), and control pins (PDN, RESET, SCLK, SEN, SDATA). This allows drop-in replacement across sampling rates (125/105/80/65 MSPS) without PCB redesign, provided system-level timing and power delivery meet the selected variant's specifications.