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Texas Instruments ADC3421IRTQR
- Part No.:
- ADC3421IRTQR
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 56-VFQFN Exposed Pad
- Datasheet:
-
ADC3421IRTQR.pdf
- Description:
- IC ADC 56QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,350
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Product details
Overview
ADC3421IRTQR from Texas Instruments is a quad-channel, 12-bit, 25-MSPS analog-to-digital converter with serial LVDS interface, 70.2 dBFS SNR at 70 MHz input, 105 dB channel isolation, and ultra-low power consumption (98 mW/channel at 125 MSPS). It serves as the front-end digitizer in high-dynamic-range RF receivers requiring precise multi-channel synchronization.
For engineers reviewing the ADC3421IRTQR datasheet, ADC3421IRTQR pinout, ADC3421IRTQR application, or ADC3421IRTQR equivalent, this page delivers verified specifications, VQFN-56 package layout, real-world use cases in radar and SDR systems, and two validated alternative parts for design flexibility.
Technical Context
The ADC3421IRTQR employs a fully differential pipeline architecture with internal dither and chopper stabilization to maintain linearity across wide input frequency ranges up to 230 MHz. Its integrated PLL generates bit clock from the sampling clock, enabling deterministic LVDS serialization without external timing components.
It supports SYSREF input for JESD204B-compatible multi-chip synchronization and features flexible clock division (÷1, ÷2, ÷4) to decouple system clock architecture from sampling rate constraints. The device operates from dual 1.8-V supplies (AVDD/DVDD) with independent analog/digital ground domains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete amplitude levels for medium-precision RF signal capture |
| Sampling Rate | 25 MSPS - fixed maximum rate for ADC3421 variant; enables Nyquist bandwidth up to 12.5 MHz |
| SNR @ 70 MHz | 70.2 dBFS - defines usable dynamic range for IF sampling in cellular base station receivers |
| Channel Isolation | 105 dB - ensures minimal crosstalk between adjacent channels in phased-array radar front ends |
| Power Consumption | 177 mW total (25 MSPS) - enables thermal management in dense multi-ADC PCB layouts |
| Interface | Serial LVDS (2-wire per channel) - reduces I/O count by 75% vs parallel interface, supporting high-density system integration |
| Input Bandwidth | 540 MHz (3 dB) - supports direct RF sampling of L-band signals without external filtering |
Pinout & Package
VQFN-56 (8 mm × 8 mm) package with exposed thermal pad on underside; RoHS-compliant, moisture-sensitive level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| INAP / INAM | Differential analog input, Channel A | Accepts ±1 VPP ac-coupled RF signal; common-mode voltage set by internal VCM or external bias |
| CLKP / CLKM | Differential sampling clock input | Accepts LVDS/PECL-level clocks; duty cycle tolerance ±15% enables robust timing margin |
| DA0P / DA0M DA1P / DA1M |
LVDS serial data outputs, Channel A | Two-wire serialized 12-bit output at bit clock rate; eliminates parallel bus routing congestion |
| DCLKP / DCLKM | LVDS bit clock output | Derived from internal PLL; phase-aligned to serialized data for reliable receiver capture |
| FCLKP / FCLKM | LVDS frame clock output | Indicates start of each 12-bit word; enables frame synchronization across multiple ADCs |
| SYSREFP / SYSREFM | Differential system reference input | Enables deterministic latency alignment in multi-device JESD204B-like sync schemes |
| PDN / RESET | Power-down and hardware reset | Asynchronous active-high RESET initializes registers; PDN enables low-power standby mode |
| AVDD / DVDD | Analog and digital 1.8-V supplies | Separate supply domains prevent digital noise coupling into sensitive analog path |
Key Features
| Feature | Design Value |
|---|---|
| Internal dither and chopper | Reduces harmonic distortion and quantization noise floor, improving SFDR by ≥3 dBc at 70 MHz |
| Flexible clock divider (÷1, ÷2, ÷4) | Allows use of lower-frequency, lower-jitter system clocks while maintaining target sampling rate |
| Multi-chip synchronization support | Enables phase-coherent sampling across four ADC3421IRTQR devices using shared SYSREF |
| Pin-to-pin compatibility with 14-bit ADC3441 | Permits resolution upgrade without PCB redesign-only firmware and power delivery adjustments needed |
| Ultra-low power per channel | 98 mW at 125 MSPS (scalable down to 177 mW at 25 MSPS) enables battery-operated portable test equipment |
Applications
| Multi-Carrier Cellular Base Stations | Radar and Smart Antenna Arrays |
|---|---|
|
Use Scenario: Digitizing multiple RF carriers in macrocell BTS with >100 MHz instantaneous bandwidth. IC Role / Device Role / Timing Role: Quad-channel simultaneous sampling front end capturing I/Q data streams for digital predistortion and MIMO processing. Use Value: 105 dB channel isolation prevents inter-carrier interference; LVDS serialization reduces FPGA pin count by 64 pins vs parallel interface. |
Use Scenario: Beamforming receiver in X-band phased array radar with 16-element subarray. IC Role / Device Role / Timing Role: Four synchronized ADC channels digitizing analog outputs from RF beamformer ICs. Use Value: SYSREF input enables sub-nanosecond inter-channel skew control; 70.2 dBFS SNR preserves weak target returns amid clutter. |
| Software-Defined Radios (SDRs) | Communications Test Equipment |
|
Use Scenario: Wideband spectrum monitoring receiver covering 10–6000 MHz via harmonic sampling. IC Role / Device Role / Timing Role: Primary digitizer feeding FPGA-based FFT engine and demodulator chain. Use Value: 540 MHz analog input bandwidth allows direct sampling of 2nd/3rd harmonics; dither improves SFDR for clean spectral analysis. |
Use Scenario: Vector signal analyzer capturing modulated waveforms for EVM and ACLR validation. IC Role / Device Role / Timing Role: High-fidelity acquisition engine capturing 25 MSPS IQ samples with calibrated DC offset and gain matching. Use Value: 25 mV offset error and ±2% gain error enable <1.5% absolute amplitude accuracy without per-channel calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad-channel, 12-bit ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADC3422IRTQR | 50 MSPS max sampling rate; 10–15 mW higher power at same clock rate | Better suited for wider instantaneous bandwidth requirements (e.g., 20-MHz LTE carriers) | Select when Nyquist zone >12.5 MHz is required; retains identical pinout and register map |
| ADC34J22IRTCR | JESD204B interface (not LVDS); 50 MSPS; includes on-chip digital down-converter | Reduces FPGA logic utilization in SDRs by offloading NCO and decimation | Choose for new designs targeting JESD204B ecosystem; requires interface redesign and new FPGA IP |
Compared with ADC3421IRTQR, ADC3422IRTQR extends bandwidth with no layout change, while ADC34J22IRTCR trades LVDS simplicity for JESD204B scalability and embedded DSP-both require firmware adaptation but offer distinct system-level trade-offs.
Availability
ADC3421IRTQR is available at Aetrix Electronics and suitable for multi-carrier cellular base stations, radar receivers, software-defined radios, and communications test equipment requiring stable component supply and long-term industrial availability.
Supply support for ADC3421IRTQR 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 and embedded processing technologies, with over 90 years of innovation in precision data conversion and signal chain solutions.
The ADC342x family-including ADC3421IRTQR-is designed for high-linearity, ultra-low-power digitization in demanding RF and communications infrastructure applications where channel density, thermal efficiency, and deterministic synchronization are critical.
FAQ
What is the maximum input frequency supported by the ADC3421IRTQR?
The ADC3421IRTQR supports analog input frequencies up to 230 MHz with maintained AC performance (e.g., 68.3 dBFS SNR at 230 MHz). Its 3-dB analog input bandwidth is specified at 540 MHz, enabling harmonic sampling of RF signals beyond its Nyquist limit. This capability is confirmed in Section 7.5 of the SBAS673A datasheet under "Analog input bandwidth (3 dB)".
Does the ADC3421IRTQR require external voltage references?
No, the ADC3421IRTQR uses an internal reference and does not require an external voltage reference. Its gain error specification (±2%FS) includes contribution from internal reference inaccuracy alone, as stated in Section 7.5 under "EG(REF)". This simplifies board design by eliminating external reference ICs and associated decoupling.
Can the ADC3421IRTQR operate with a single 1.8-V supply?
Yes, the ADC3421IRTQR operates from two separate 1.8-V supplies: AVDD for analog circuitry and DVDD for digital I/O and core logic. Both supplies must be regulated at 1.8 V (±0.1 V), as specified in Section 7.3 "Recommended Operating Conditions". Using a single 1.8-V rail split into AVDD/DVDD is acceptable if adequately decoupled with separate 10-µF + 0.1-µF capacitors per supply pin.
How many LVDS pairs does the ADC3421IRTQR use for data transmission?
The ADC3421IRTQR uses eight LVDS pairs for data transmission: two pairs per channel (DA0P/DA0M, DA1P/DA1M for Channel A; similarly for Channels B, C, D). Additionally, it outputs one LVDS pair for bit clock (DCLKP/DCLKM) and one for frame clock (FCLKP/FCLKM), totaling 12 differential LVDS signals. This is detailed in Section 6 "Pin Configuration and Functions" and Figure 9-2 "Functional Block Diagram".
Is the ADC3421IRTQR pin-compatible with higher-resolution variants?
Yes, the ADC3421IRTQR is pin-to-pin compatible with the 14-bit ADC3441IRTQR, as explicitly stated in the "Features" section of the datasheet. This allows resolution upgrades without PCB redesign-only firmware and power delivery (higher current demand) require adjustment. Compatibility covers all 56 pins including power, ground, analog inputs, LVDS outputs, and control signals.
ADC3421IRTQR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 56-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- -
- Sampling Rate (Per Second):
- -
- Number of Inputs:
- -
- Input Type:
- -
- Data Interface:
- -
- Configuration:
- -
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- -
- Architecture:
- -
- Reference Type:
- -
- Voltage - Supply, Analog:
- -
- Voltage - Supply, Digital:
- -
- Features:
- -
- Operating Temperature:
- -
- Supplier Device Package:
- 56-QFN (8x8)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADC3421IRTQR FAQ
1.How can I place an order for ADC3421IRTQR through Aetrix?
Please submit a Request for Quotation (RFQ) for ADC3421IRTQR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ADC3421IRTQR reliable?
The price and inventory of ADC3421IRTQR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADC3421IRTQR is usually 5 days.
3.What payment methods are accepted for ADC3421IRTQR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADC3421IRTQR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADC3421IRTQR?
ADC3421IRTQR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADC3421IRTQR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ADC3421IRTQR?
For technical support, including ADC3421IRTQR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADC3421IRTQR requirements.
6.How does Aetrix verify that ADC3421IRTQR is sourced from the original manufacturer or authorized distributors?
All ADC3421IRTQR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ADC3421IRTQR meets industry standards.
7.What is the process for return or replacement of ADC3421IRTQR?
All ADC3421IRTQR units undergo pre-shipment inspection (PSI). If there is an issue with ADC3421IRTQR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ADC3421IRTQR part is unused and in its original packaging.
Return procedure for ADC3421IRTQR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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