Texas Instruments ADS5484IRGCT

Overview

ADS5484IRGCT from Texas Instruments is a 16-bit, 170-MSPS analog-to-digital converter with on-chip high-impedance analog buffer, 78 dBFS noise floor, and 95 dBc spurious-free dynamic range (SFDR) at 30 MHz input. It operates from dual supplies (5 V and 3.3 V), delivers DDR LVDS-compatible outputs, and targets high-fidelity signal acquisition in wireless infrastructure baseband receivers.

For engineers reviewing the ADS5484IRGCT datasheet, ADS5484IRGCT pinout, ADS5484IRGCT application, or ADS5484IRGCT equivalent, this page provides verified electrical specs, thermal resistance (RθJA = 20°C/W), power-down modes (70 mW deep sleep), latency (5 clock cycles), and QFN-64 PowerPAD package details essential for RF sampling system design and layout validation.

Technical Context

The ADS5484IRGCT implements a pipelined ADC architecture with integrated track-and-hold and internal reference generator, enabling direct connection to high-impedance sources without external buffering. Its differential analog inputs (INP/INM) accept ±1.5 VPP full-scale signals referenced to VCM = 3.1 V, while the dual-supply analog core (AVDD5/AVDD3) isolates noise-sensitive circuitry.

It features configurable dithering to improve SFDR, three power-down states (normal, light sleep, deep sleep), and DDR LVDS output pairs delivering even/odd bit interleaving with DRY strobe synchronization. Timing is governed by differential CLKP/CLKM inputs with aperture jitter of 80 fs rms and fixed 5-cycle latency.

Key Specifications

Pinout & Package

ADS5484IRGCT is housed in a thermally enhanced QFN-64 PowerPAD™ package (9 mm × 9 mm footprint) with exposed thermal pad (Pin 65 = AGND) soldered to PCB ground plane for RθJP = 0.2°C/W junction-to-pad thermal resistance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS5485IRGCT and AD9643BCPZ-170, the ADS5484IRGCT uniquely balances 16-bit resolution, LVDS simplicity, and integrated buffering-making it optimal for cost-sensitive, high-SFDR IF sampling where board space permits parallel interface routing and external drivers are undesirable.

Availability

ADS5484IRGCT is available at Aetrix Electronics and suitable for wireless infrastructure baseband receivers, test & measurement digitizers, and software-defined radio platforms requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for ADS5484IRGCT 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, automotive, and communications markets.

The ADS548x family was designed specifically for high-SFDR, high-resolution digitization in wireless infrastructure and instrumentation-emphasizing low-noise analog front-ends, robust LVDS interfacing, and seamless scalability across sample rates.

FAQ

What is the maximum input frequency supported by the ADS5484IRGCT before aliasing becomes problematic?

The ADS5484IRGCT has an analog input bandwidth of 730 MHz (–3 dB), but its Nyquist limit at 170 MSPS is 85 MHz. For undersampling applications, it reliably captures signals up to ~230 MHz (as validated in Figure 5 of SLAS610C), provided anti-alias filtering and clock jitter (<80 fs rms) are tightly controlled. The ADS5484IRGCT's high SFDR at 230 MHz (73 dBc) confirms usable performance beyond first Nyquist.

Does the ADS5484IRGCT require external analog input termination resistors?

No. The ADS5484IRGCT integrates a high-impedance analog input buffer with 1000 Ω input resistance per pin (to VCM) and 3.5 pF input capacitance. External termination is not needed-differential input signals are applied directly to INP/INM. However, a 0.1-μF capacitor is recommended on VCM and REF pins for stability, as specified in the ADS5484IRGCT datasheet.

How does the power-down functionality of the ADS5484IRGCT operate, and what are the wake-up times?

The ADS5484IRGCT offers two power-down modes: PDWNF = H enables light sleep (600 μs wake-up, 680 mW); PDWNS = H enables deep sleep (6 ms wake-up, 70–100 mW). Both are controlled independently via logic-level inputs referenced to DVDD3. The ADS5484IRGCT retains register settings during sleep, and no reconfiguration is needed after wake-up-critical for burst-mode wireless receivers.

Can the ADS5484IRGCT be used with an external reference instead of the internal one?

Yes. To disable the internal reference and use an external 1.2 V reference, both PDWNF and PDWNS must be driven high (DVDD3 level), and the external reference is applied to the REF pin. The ADS5484IRGCT's REF pin is designed for this mode, and the internal bandgap is fully disabled-ensuring no conflict between internal and external references during operation.

What is the significance of the "RGC" package designation in ADS5484IRGCT?

The "RGC" in ADS5484IRGCT denotes Texas Instruments' QFN-64 PowerPAD™ package with 9 mm × 9 mm footprint and exposed thermal pad (Pin 65). This package provides low thermal resistance (RθJA = 20°C/W with soldered pad and no airflow) and is optimized for high-power ADCs like the ADS5484IRGCT that dissipate up to 2.35 W. The RGC variant is RoHS-compliant and qualified for industrial temperature range (–40°C to +85°C).