ADC3421IRTQ25

Analog To Digital Converters (ADC) Overview

The ADC3421IRTQ25 is a quad-channel, 12-bit analog-to-digital converter (ADC) from Texas Instruments. It operates at a maximum sampling rate of 25 MSPS with a single 1.8-V supply. The device features a serial low-voltage differential signaling (LVDS) interface and supports flexible input clock buffering with divide-by-1, -2, or -4 options. An internal phase-locked loop (PLL) multiplies the incoming sampling clock to derive the bit clock for serialization. Key performance metrics include an SNR of 70.2 dBFS and SFDR of 87 dBc at fIN = 70 MHz. It includes internal dither and chopper functions, channel isolation of 105 dB, and SYSREF input for system synchronization.

Analog To Digital Converters (ADC) Feature Summary

• Quad-channel, 12-bit resolution with 25 MSPS maximum sampling rate
• Serial LVDS interface reducing pin count and enabling high integration density
• Ultra-low power consumption: 98 mW per channel at 125 MSPS equivalent architecture
• Internal PLL, dither, chopper, and SYSREF input for synchronization

Analog To Digital Converters (ADC) Applications

• Multi-carrier, multi-mode cellular base stations
• Radar and smart antenna arrays
• Software-defined radios (SDRs)
• Communications test equipment
• Munitions guidance systems

Analog To Digital Converters (ADC) Procurement Notes

Verify the specific ordering suffix 'IRTQ25' against the manufacturer's current orderable addendum to confirm package type, temperature range, and tape-and-reel specifications. Ensure compatibility with existing board layouts regarding the VQFN-56 footprint and thermal pad requirements. Check for any recent product change notices (PCN) that may affect assembly materials or sourcing locations.

Analog To Digital Converters (ADC) Selection Notes

Select the ADC3421 when a 25 MSPS sampling rate is sufficient for the application bandwidth. Compare against ADC3422 (50 MSPS), ADC3423 (80 MSPS), and ADC3424 (125 MSPS) if higher throughput is required. Consider the ADC344x series for 14-bit resolution needs. Verify that the system clock architecture can accommodate the internal PLL multiplication factor and input clock divider settings.

Analog To Digital Converters (ADC) Part Context

The ADC3421 is part of the ADC342x family, which shares a common pinout and functional block diagram across four speed grades. This family is designed for high-linearity and ultra-low power applications in demanding RF environments. It is pin-to-pin compatible with the 14-bit ADC344x family, facilitating design upgrades without PCB layout changes.

Analog To Digital Converters (ADC) Replacement Considerations

Direct replacements within the same family include ADC3422, ADC3423, and ADC3424 for higher speed requirements. For 14-bit resolution, consider the ADC3441. Ensure that the replacement device's power consumption and thermal characteristics are compatible with the existing design.