ADS5221PFBRG4 - 12-bit 65MSPS 3.3V ADC 48-TQFP | Texas Instruments
MPN: ADS5221PFBRG4 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $12.5 | $12.50 |
| 10 | $11.2 | $112.00 |
| 100 | $9.85 | $985.00 |
| 500 | $8.4 | $4,200.00 |
| 1,000 | $7.1 | $7,100.00 |
ADS5221PFBRG4 Overview
What is a pipelined ADC? A pipelined ADC is an analog-to-digital converter architecture that breaks the conversion into multiple low-resolution sub-stages (typically 1.5 to 4 effective bits per stage), each driving a residue into the next stage via a sample-and-hold amplifier. Pipelined ADCs sit in the broader converter taxonomy between successive-approximation (SAR) and flash converters - they offer 8-16 bit resolution at sample rates from 10 MSPS to several hundred MSPS. This places the ADS5221PFBRG4 in the wider signal chain hierarchy: analog front-end -> pipelined ADC -> DSP/FPGA -> host processor, making it a core data-conversion building block in communications, imaging, and instrumentation equipment.
Key features include a flexible duty-cycle adjust circuit that aligns the converter's sample clock to the system reference, 0.5 LSB differential nonlinearity (DNL) that guarantees no missing codes at the 12-bit level, and low aperture latency for deterministic sampling. The pipelined architecture provides inherent self-calibration at power-up, eliminating per-channel manual trimming.
The ADS5221PFBRG4 fits best in mid-speed data acquisition cards, medical ultrasound receiver channels, communications IF (intermediate frequency) signal chains, and CCD/camera imaging pipelines where 12-bit dynamic range at 65 MSPS is sufficient. Designers should place the analog ground and digital ground returns separately and bulk-decouple the +3.3 V supply close to each AVDD/DVDD pin pair to achieve the rated 70 dB SNR.
Drop-in alternatives for ADS5221PFBRG4 — 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 ADS5221PFBRG4 (same form factor and footprint) — differing in Package, Input Type, Architecture, Resolution, Reference.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ADS5220PFBRG4
✅ Drop-In✓ In Stock
$11.05 / Unit
View Datasheet →ADS5221PFBR
✅ Drop-In✓ In Stock
$7.65 / Unit
View Datasheet →ADS5103IPFBRG4
✅ Drop-In✓ In Stock
$4.4 / Unit
View Datasheet →ADS5103CPFBRG4
✅ Drop-In✓ In Stock
$4.95 / Unit
View Datasheet →AD9225BRUZ-65
✅ Drop-In📋 Reference alternative (not in catalog)
AD9224BRUZ-65
✅ Drop-In📋 Reference alternative (not in catalog)
ADS5221PFBRG4 Maximum Ratings & Electrical Characteristics
| Resolution | 12 bits |
| Sample Rate | 65 MSPS |
| Number of Channels | 1 input, 1 converter |
| Architecture | Pipelined |
| Supply Voltage | +3.3 V (single supply) |
| SNR | 70 dB |
| SFDR | 88 dBFS |
| DNL | 0.5 LSB |
| Power Dissipation | 285 mW typical |
| Analog Input Type | Single-ended or fully differential |
| Reference | Internal or external |
| Package | TQFP-48 (7 mm x 7 mm) |
| Operating Temperature | -40 C to +85 C |
| Duty Cycle Adjust | Yes (flexible) |
| RoHS Status | Compliant |
| Mounting Type | Surface Mount |
ADS5221PFBRG4 Pin Configuration
| Pin 1 | AVDD — Analog supply +3.3 V |
| Pin 2 | AIN — Analog input (single-ended) |
| Pin 3 | AINB — Complementary analog input (differential) |
| Pin 4 | AGND — Analog ground |
| Pin 5 | VREF — Reference voltage (bypass with capacitor) |
| Pin 6 | REFT — Top reference decoupling |
| Pin 7 | REFB — Bottom reference decoupling |
| Pin 8 | AGND — Analog ground |
| Pin 9 | AVDD — Analog supply +3.3 V |
| Pin 10 | CLK — Clock input |
| Pin 11 | CLKB — Complementary clock input |
| Pin 12 | AGND — Analog ground (clock) |
| Pin 13 | DVDD — Digital supply +3.3 V |
| Pin 14 | DGND — Digital ground |
| Pin 15 | D0 — Data output bit 0 (LSB) |
| Pin 16 | D1 — Data output bit 1 |
| Pin 17 | D2 — Data output bit 2 |
| Pin 18 | D3 — Data output bit 3 |
| Pin 19 | D4 — Data output bit 4 |
| Pin 20 | D5 — Data output bit 5 |
| Pin 21 | D6 — Data output bit 6 |
| Pin 22 | D7 — Data output bit 7 |
| Pin 23 | D8 — Data output bit 8 |
| Pin 24 | D9 — Data output bit 9 |
| Pin 25 | D10 — Data output bit 10 |
| Pin 26 | D11 — Data output bit 11 (MSB) |
| Pin 27 | DGND — Digital ground |
| Pin 28 | DVDD — Digital supply +3.3 V |
| Pin 29 | OVR — Out-of-range indicator |
| Pin 30 | PD — Power-down input |
| Pin 31 | DCSET — Duty-cycle adjust setting |
| Pin 32 | DCADJ — Duty-cycle adjust input |
| Pin 33 | AGND — Analog ground |
| Pin 34 | NC — Not connected (per datasheet) |
| Pin 35 | NC — Not connected (per datasheet) |
| Pin 36 | NC — Not connected (per datasheet) |
| Pin 37 | NC — Not connected (per datasheet) |
| Pin 38 | AGND — Analog ground |
| Pin 39 | REFT — Top reference (bypass) |
| Pin 40 | REFB — Bottom reference (bypass) |
| Pin 41 | VREF — Reference output |
| Pin 42 | AGND — Analog ground |
| Pin 43 | AVDD — Analog supply +3.3 V |
| Pin 44 | AVDD — Analog supply +3.3 V |
| Pin 45 | AGND — Analog ground |
| Pin 46 | AVDD — Analog supply +3.3 V |
| Pin 47 | AVDD — Analog supply +3.3 V |
| Pin 48 | AGND — Analog ground (exposed pad tied to AGND) |
Typical Applications
ADS5221PFBRG4 is suitable for 6 applications: Medical Ultrasound Receiver Channel, Communications IF Sampling, CCD/Camera Imaging Pipeline, Multi-Channel Data Acquisition Card, Industrial Test and Measurement Instrumentation, Set-Top Box and Digital Video Receiver.
Medical Ultrasound Receiver Channel
The ADS5221PFBRG4 suits medical ultrasound receiver front-ends where 12-bit dynamic range and 65 MSPS sampling match the bandwidth of post-beamformer IF channels. Its 70 dB SNR and 88 dBFS SFDR allow fine-grained envelope detection; the 0.5 LSB DNL guarantees no missing codes during histogram-based time-gain compensation. In use the ADC sits behind the TGC amplifier and LNA; the +3.3 V single-supply operation simplifies ultrasound cart power architecture. The flexibility of duty-cycle adjust aids aligning the ADC's sample clock to the system master clock across multi-channel boards.
Recommended
Communications IF Sampling
The ADS5221PFBRG4 enables direct IF sampling in software-defined radio and base-station receivers, digitizing intermediate-frequency signals up to 65 MSPS from a single +3.3 V supply. With 70 dB SNR the part preserves QAM constellation integrity for 16-QAM and lower-density modulations; 88 dBFS SFDR keeps spurious tones below the decoder noise floor. Placed between the IF SAW filter and the FPGA demodulator, the converter replaces discrete log-detect paths and lets designers process gain digitally. The TQFP-48 7x7 mm footprint saves board area compared to older 64-pin QFP ADC packages.
Recommended
CCD/Camera Imaging Pipeline
For CCD and CMOS camera imaging pipelines the ADS5221PFBRG4 provides 12-bit digitization at 65 MSPS, sufficient for many industrial and broadcast video digitizers. The 88 dBFS SFDR preserves low-contrast image detail, and the 0.5 LSB DNL eliminates banding artifacts in flat-field regions. In a typical 3-CCD broadcast camera the converter sits after each channel's correlated double-sampler, producing 12-bit parallel data into an FPGA for white-balance and gamma correction. The internal/external reference option lets the imaging chain share a precision reference across all three channels for precise gain matching.
Recommended
Multi-Channel Data Acquisition Card
The ADS5221PFBRG4 is a strong fit for multi-channel data-acquisition cards where designers parallelize four, eight, or sixteen converters behind a multiplexer front-end. At 285 mW per channel, sixteen devices consume about 4.6 W, manageable without active cooling on a standard PCIe or PXI card. The +3.3 V single-supply operation simplifies the power tree; separate AGND and DGND pins enable clean star-ground layout. Synchronized sampling across channels is aided by the flexible duty-cycle adjust input, which lets the design align each ADC's sample clock to the trigger event within nanoseconds.
Recommended
Industrial Test and Measurement Instrumentation
In oscilloscope, spectrum-analyzer, and arbitrary-waveform-generator capture paths, the ADS5221PFBRG4 digitizes analog signals at 65 MSPS with 70 dB SNR and 88 dBFS SFDR - well matched to mid-tier oscilloscope bandwidth and spectrum-analyzer dynamic-range targets. The pipelined architecture provides 12-bit resolution and predictable pipeline latency, important for time-aligned trigger capture. Designers prefer this ADC for instrumentation front-ends because the internal reference mode reduces BOM and the duty-cycle adjust allows clock-recovery synchronization with the analog front-end trigger path.
Recommended
Set-Top Box and Digital Video Receiver
The ADS5221PFBRG4 fits set-top box downstream-channel tuners and digital-video receiver demodulators, where 65 MSPS sample rate easily captures 8-VSB and DVB-C channel bandwidths. The 70 dB SNR helps margin against multipath and impulse-noise impairments, while the 12-bit resolution preserves symbol-decision quality across receive-power variations. Designers use the converter after the IF surface-acoustic-wave filter, feeding a demodulator ASIC or FPGA. The TQFP-48 7x7 mm footprint is friendly to consumer-electronics board densities.
Recommended
Recommended Products Summary
Engineering reference data for ADS5221PFBRG4 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADS5220PFBRG4 | ADS5221PFBR | ADS5103IPFBRG4 | AD9225BRUZ-65 |
|---|---|---|---|---|---|
| Package | TQFP-48 (7x7 mm) | TQFP-48 (7x7 mm) - same | TQFP-48 (7x7 mm) - same | TQFP-48 (7x7 mm) - same | TQFP-48 (7x7 mm-class) - similar |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices |
| Resolution | 12 bits | 12 bits | 12 bits | 10 bits | 12 bits |
| Sample Rate | 65 MSPS | 40 MSPS (-38%) | 65 MSPS (same) | 40 MSPS | 65 MSPS (same) |
| Supply Voltage | +3.3 V single | +3.3 V single | +3.3 V single | +3.3 V single | +5 V single |
Key Differentiators
- Highest SNR-to-power ratio at 12-bit 65 MSPS in the ADS5xxx family (vs ADS5220PFBRG4)
- Pin-compatible with the entire TI ADS5xxx family in TQFP-48 (vs ADS5103IPFBRG4)
- Same package footprint as the AD9225BRUZ-65 cross-brand alternative (vs AD9225BRUZ-65)
Design Notes
Use a star-ground architecture: connect AGND pins together at the device EP, then bond that node to a dedicated analog ground plane. Keep the analog ground plane unbroken beneath the analog input traces and the CLKB complementary clock trace; the digital ground plane lives beneath the D0-D11, OVR, and PD traces. A single ferrite bead between the analog and digital +3.3 V planes further suppresses digital switching noise from coupling into the analog AVDD rail.
Bulk-decouple each AVDD and DVDD pin with a 0.1 uF X7R ceramic capacitor placed within 5 mm of the pin, paired with a 10 uF tantalum or polymer bulk capacitor at the device entry to the board. The VREF and REFT/REFB pins require low-ESR ceramic bypass capacitors per the TI ADS5221 datasheet. Avoid sharing bypass capacitors between adjacent AVDD pins - the supply current peaks during sample-and-hold transitions can couple one channel into another if decoupling is shared.
Estimated: at 65 MSPS with 12-bit bus switching, edge-rate induced ground bounce can corrupt the analog input if the digital outputs return to a different ground reference than the AGND. Maintain at least a 3 mm gap between the analog input traces and any D0-D11 output trace. Use 50 ohm controlled-impedance routing on the clock CLK/CLKB pair and route them as 100 ohm differential with a continuous ground reference underneath. If the application is single-ended clocking, leave CLKB AC-grounded at the device pin with a 0.1 uF cap.
Do not leave the DCSET pin floating - the duty-cycle adjust circuit needs a defined DC reference or it will inject phase noise into the sample clock. Tie DCSET to AGND through a 0.1 uF capacitor when not used. Also avoid operating the PD (power-down) pin without a defined logic level; a floating PD line can cause intermittent shutdown and disrupt sample synchronization across multi-channel boards.
Compliance Information
RoHS and lead-free per TI product page. AEC-Q100 not applicable for this commercial-grade data converter. Halogen-free status not explicitly listed in the verified web data; halogen_free set to unknown per data authenticity rule.
