ADS5421Y/R - 14-Bit 40MSPS Pipelined ADC | Texas Instruments
MPN: ADS5421Y/R ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $38.5 | $38.50 |
| 10 | $34.2 | $342.00 |
| 100 | $30.05 | $3,005.00 |
| 500 | $26.8 | $13,400.00 |
| 1,000 | $23.5 | $23,500.00 |
ADS5421Y/R Overview
A pipelined ADC such as the ADS5421Y/R is a multi-stage converter that processes the analog input through successive low-resolution flash stages, with each stage resolving a portion of the bits while a high-bandwidth track-and-hold holds the residue for the next stage. In the broader system hierarchy, pipelined ADCs sit between successive-approximation register (SAR) converters (used for low-speed, high-precision measurements) and flash ADCs (used for ultra-high-speed but low-resolution capture). The pipelined architecture enables tens-of-MSPS sampling with 10-14 bit resolution at moderate power, occupying a middle ground in the data-converter taxonomy of precision, speed, and power dissipation. As a member of the data-converter subcategory under signal chain and power management ICs, the ADS5421Y/R bridges the analog front end and the digital signal processor (DSP) or field-programmable gate array (FPGA) downstream.
Key features include 14-bit resolution, 40 MSPS maximum sampling rate, 850 mW typical power dissipation, a flexible differential or single-ended clock input accepting down to 0.5 VPP levels, internal or external reference modes, selectable full-scale input range, and CMOS-compatible digital outputs. The LQFP-64 package provides 64 gull-wing leads on a 0.5 mm pitch, simplifying PCB layout and rework compared with fine-pitch ball-grid packages. The industrial operating temperature range of -40C to +85C and the absence of an automotive grade suffix in the /R designation confirm its positioning for general-purpose industrial, communications, and instrumentation designs.
Typical applications include high-IF undersampling in communications receivers, medical imaging front ends such as ultrasound beamformers, high-speed instrumentation and test equipment, CCD imaging digitizers, and radar intermediate-frequency (IF) digitizers. The pipelined latency of several clock cycles must be accounted for in closed-loop servo applications but is invisible in data acquisition and receive-only signal chains. When designing with this ADC, allocate adequate PCB area for the analog and digital ground planes, place decoupling capacitors within 2-3 mm of each supply pin, and route the clock and analog inputs as controlled-impedance differential pairs to preserve the datasheet SFDR/SNR figures in production hardware.
Drop-in alternatives for ADS5421Y/R — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with ADS5421Y/R (same form factor and footprint) — differing in Input Type, Resolution, Package, RoHS Status, Analog Supply Voltage.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ADS5421Y/T
✅ Drop-In📋 Reference alternative (not in catalog)
ADS5421Y/TG4
✅ Drop-In📋 Reference alternative (not in catalog)
ADS5421
✅ Drop-In📋 Reference alternative (not in catalog)
ADS5103IPFBRG4
✅ Drop-In✓ In Stock
$4.4 / Unit
View Datasheet →ADS5220PFBRG4
✅ Drop-In✓ In Stock
$11.05 / Unit
View Datasheet →ADS5421Y/R Maximum Ratings & Electrical Characteristics
| Resolution | 14 bit |
| Number of Channels | 1 |
| Sampling Rate | 40 MSPS |
| Architecture | Pipelined |
| Input Type | Differential (single-ended selectable) |
| Analog Supply Voltage | 5 V |
| Digital Supply Voltage | 3 V to 5 V |
| Power Dissipation | 850 mW (typical) |
| Clock Input | Differential or single-ended, 0.5 VPP minimum |
| Full-Scale Input Range | Selectable (internal reference mode) |
| Package | 64-pin LQFP (PM) 10x10 mm |
| Package Code | LFQFP, Gull Wing |
| Operating Temperature | -40C to +85C (industrial) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
ADS5421Y/R Pin Configuration
| Pin 1 | AVDD — Analog 5V supply |
| Pin 10 | IN- — Negative analog input |
| Pin 16 | CLK+ — Positive differential clock input |
| Pin 17 | CLK- — Negative differential clock input |
| Pin 20 | REFT — Top reference decoupling |
| Pin 21 | REFB — Bottom reference decoupling |
| Pin 24 | DRVDD — Digital output driver supply |
| Pin 30 | D0 — Data output bit 0 (LSB) |
| Pin 43 | D13 — Data output bit 13 (MSB) |
| Pin 64 | AGND — Analog ground |
Typical Applications
ADS5421Y/R is suitable for 6 applications: Communications Receiver IF Digitization, Medical Ultrasound Imaging, Test and Measurement Instrumentation, Radar IF Digitization, CCD and CMOS Image Sensor Digitization, Industrial Process Control Data Acquisition.
Communications Receiver IF Digitization
The ADS5421Y/R suits high-IF undersampling in communications receivers where 14-bit resolution and 40 MSPS capture bandwidth cleanly digitize 10-20 MHz IF stages. The differential clock input accepting down to 0.5 VPP sine waves minimizes jitter, preserving SNR when sampling intermediate-frequency signals at or above the Nyquist rate. Placed after the analog front-end mixer and SAW filter chain, the ADC feeds a downstream DSP or FPGA demodulator.
Recommended
Medical Ultrasound Imaging
The ADS5421Y/R is well-matched to ultrasound beamformer front ends where each channel digitizes transducer return signals at MHz bandwidths. The 14-bit resolution captures the dynamic range of echo amplitudes, while the 40 MSPS rate supports typical 2-10 MHz transducer frequencies. The pipelined latency is acceptable for receive-only beamforming paths that do not require closed-loop servo response.
Recommended
Test and Measurement Instrumentation
The ADS5421Y/R serves well in digital oscilloscopes, spectrum analyzers, and arbitrary waveform digitizers where 14-bit vertical resolution and 40 MSPS sampling extend dynamic range beyond typical 8-bit oscilloscope front ends. The selectable full-scale input range and internal reference modes allow calibration across measurement scales. Differential analog inputs reject common-mode noise in bench-instrument signal paths.
Recommended
Radar IF Digitization
The ADS5421Y/R works in radar intermediate-frequency (IF) digitizers where 14-bit resolution captures the dynamic range of received echoes after down-conversion. The pipelined architecture's latency is acceptable for surveillance and tracking radar where data flows through DSP beamforming rather than real-time servo control. Industrial temperature grade supports harsh-environment military and aerospace platforms.
Recommended
CCD and CMOS Image Sensor Digitization
The ADS5421Y/R digitizes analog outputs from charge-coupled device (CCD) line-scan or area-array image sensors in industrial inspection systems. The 14-bit resolution captures grayscale depth across the sensor's dynamic range, while the 40 MSPS rate supports pixel clock rates up to 40 MHz typical of high-resolution line-scan imagers. Differential inputs reject common-mode pickup from motor and lighting noise.
Recommended
Industrial Process Control Data Acquisition
The ADS5421Y/R operates in industrial process control data acquisition cards that monitor high-speed sensor signals such as vibration, pressure transients, or current waveforms in motor drives. The 14-bit resolution captures small signal variations while the 40 MSPS rate handles fast transient events. Industrial -40C to +85C operating range supports deployment in factory-floor enclosures.
Recommended
Recommended Products Summary
Engineering reference data for ADS5421Y/R — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADS5421Y/T | ADS5421Y/TG4 | ADS5421 | ADS5103IPFBRG4 | ADS5220PFBRG4 |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | LQFP-64 (PM) 10x10 mm | LQFP-64 (PM) 10x10 mm - same | LQFP-64 (PM) 10x10 mm - same | LQFP-64 (PM) 10x10 mm - same | TQFP-48 - different | TQFP-48 - different |
| Resolution | 14 bit | 14 bit | 14 bit | 14 bit | 10 bit | 12 bit |
| Sampling Rate | 40 MSPS | 40 MSPS | 40 MSPS | 40 MSPS | 40 MSPS | 40 MSPS |
| Analog Supply | 5 V | 5 V | 5 V | 5 V | 3.3 V | 3.3 V |
| Architecture | Pipelined | Pipelined | Pipelined | Pipelined | Pipelined | Pipelined |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
Key Differentiators
- 14-bit resolution at 40 MSPS in a 64-pin LQFP package (vs ADS5103IPFBRG4 (10-bit))
- 5V analog supply for high-SFDR operation (vs ADS5220PFBRG4 (3.3V supply))
- Industrial -40C to +85C operating range (vs ADS5421Y/TG4 (same industrial grade))
Design Notes
Separate analog and digital ground planes are critical for the ADS5421Y/R to achieve datasheet SFDR/SNR figures. Connect AGND and DGND only at a single point near the ADC, and place 0.1 uF ceramic decoupling capacitors within 2-3 mm of each AVDD and DRVDD pin. A bulk 10 uF tantalum or ceramic capacitor near the analog supply pins handles transient current demand during pipeline stage transitions. Estimated: with 850 mW dissipation at 5 V, peak switching currents can reach 200-300 mA on the analog rail.
Route the analog input (IN+/IN-) and clock (CLK+/CLK-) as 100-ohm differential pairs with matched lengths to preserve timing symmetry. The datasheet specifies minimum 0.5 VPP clock drive, but in practice driving the clock with a low-jitter LVPECL or LVDS source achieves the best SNR at high input frequencies. Keep analog traces away from the parallel CMOS digital outputs (D0-D13) to avoid coupling digital switching noise into the analog front end.
The pipelined architecture of the ADS5421Y/R introduces a fixed latency of several clock cycles between the sampled analog edge and the corresponding digital output. Do not use this ADC in closed-loop servo or feedback control applications where deterministic loop latency is required. Additionally, ensure the external reference (if selected) is low-noise and well-decoupled - the internal reference mode provides the best SFDR but limits flexibility in setting the full-scale input range.
Compliance Information
RoHS compliant per TI product page. The /R suffix denotes Tape and Reel packaging. Not AEC-Q100 qualified - this is an industrial-grade part. The /TG4 variant adds green (Pb-free) finish certification.
