Texas Instruments ADS6125IRHBTG4

Overview

ADS6125IRHBTG4 from Texas Instruments is a 12-bit, 125 MSPS analog-to-digital converter with DDR LVDS or parallel CMOS outputs, 3.5 dB coarse gain and programmable fine gain up to +6 dB, internal reference, and 32-pin QFN (5 mm × 5 mm) package. It delivers 71.1 dBFS SINAD at 170 MHz input with 3.5 dB gain and consumes 417 mW total power, targeting high-speed data acquisition in wireless infrastructure and radar systems.

For engineers reviewing the ADS6125IRHBTG4 datasheet, ADS6125IRHBTG4 pinout, ADS6125IRHBTG4 application, or ADS6125IRHBTG4 equivalent, key selection considerations include its 125 MSPS sampling rate, dual-output interface flexibility (LVDS/CMOS), clock amplitude support down to 400 mV_PP, duty cycle stabilizer, and industrial temperature range (–40°C to 85°C).

Technical Context

The ADS6125IRHBTG4 employs a high-bandwidth sample-and-hold circuit and low-jitter clock buffer to maintain 78 dBc SFDR at 170 MHz input with 3.5 dB coarse gain. Its digital interface supports both DDR LVDS (3.3 V DRVDD, 3.5 mA current, 100 Ω load) and parallel CMOS (1.8–3.3 V DRVDD), with programmable output clock position and drive strength for timing margin optimization.

Configuration is achieved via 3-wire serial interface (SEN/SCLK/SDATA) or dedicated parallel pins for power-up state control. Internal reference eliminates external decoupling requirements, while external reference mode supports 1.45–1.55 V common-mode voltage on VCM pin - both modes validated across –40°C to 85°C.

Key Specifications

Pinout & Package

ADS6125IRHBTG4 is housed in a 32-pin QFN package (5 mm × 5 mm) with exposed thermal pad, θ_JA = 34 °C/W (0 LFM), and JEDEC-standard 4-layer PCB mounting requirements.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS6124IRHBT and ADS5272IPFP, ADS6125IRHBTG4 delivers highest sampling throughput and SFDR at 170 MHz among pin-compatible ADS612X family members, making it optimal for next-generation wireless infrastructure where spectral purity and bandwidth are critical.

Availability

ADS6125IRHBTG4 is available at Aetrix Electronics and suitable for wireless infrastructure, radar systems, and software-defined radio applications requiring stable component supply, long-term production continuity, and guaranteed industrial temperature grade performance.

Supply support for ADS6125IRHBTG4 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 with emphasis on reliability, precision, and energy efficiency.

The ADS612X product line was designed specifically for high-speed, high-dynamic-range data acquisition in communications and instrumentation systems, balancing 12-bit resolution, 65–125 MSPS sampling, and low-power QFN packaging.

FAQ

What is the maximum sampling rate supported by ADS6125IRHBTG4?

The ADS6125IRHBTG4 supports a maximum sampling rate of 125 MSPS, as confirmed in the device's datasheet absolute maximum ratings and electrical characteristics tables. This rate is achievable across the full industrial temperature range (–40°C to 85°C) with AVDD = DRVDD = 3.3 V and proper clock conditioning. At this rate, the ADC maintains 71.1 dBFS SINAD and 78 dBc SFDR at 170 MHz input with 3.5 dB coarse gain. The ADS6125IRHBTG4 is the top-speed member of the pin-compatible ADS612X family.

Does ADS6125IRHBTG4 require external decoupling capacitors for its internal reference?

No, ADS6125IRHBTG4 does not require external decoupling capacitors for its internal reference. The datasheet explicitly states "No External Decoupling Required for References" under Features and confirms this in the Electrical Characteristics section, where VREFB and VREFT are specified with ±5 mV error over temperature. This eliminates two 10 µF ceramic capacitors typically needed for reference stability, reducing BOM count and PCB area - a verified design advantage for compact RF modules.

What output interface options does ADS6125IRHBTG4 support?

ADS6125IRHBTG4 supports two mutually exclusive digital output interfaces: DDR LVDS and parallel CMOS. LVDS mode requires DRVDD = 3.3 V and delivers data on six differential pairs (D0_D1_P/M through D10_D11_P/M) with source-synchronous CLKOUTP/M. CMOS mode supports DRVDD = 1.8–3.3 V and outputs 12 single-ended signals (D0–D11). Interface selection is controlled either via parallel pins (SEN/SCLK) at power-up or through serial register 0x04 - both methods are fully documented and validated for ADS6125IRHBTG4.

Can ADS6125IRHBTG4 operate with a 400 mV_PP differential clock input?

Yes, ADS6125IRHBTG4 supports differential clock input amplitudes as low as 400 mV_PP, as specified in the Recommended Operating Conditions table. This applies to all supported clock types - sine, LVPECL, LVDS, and LVCMOS - and is verified across the full temperature range. The integrated clock buffer and duty cycle stabilizer ensure robust sampling jitter performance (<150 fs rms) even at this minimum amplitude, enabling direct connection to low-power clock sources without intermediate amplification.

What is the analog input bandwidth of ADS6125IRHBTG4?

The analog input bandwidth of ADS6125IRHBTG4 is 450 MHz, as measured from the –3 dB point of the small-signal frequency response. This specification is confirmed in the Electrical Characteristics table and enables undersampling applications such as direct IF digitization in radar and broadband communications. The 450 MHz bandwidth is maintained across the full industrial temperature range and supports differential input signals up to 2 V_PP with 71.1 dBFS SINAD at 170 MHz input frequency.