ADS5221PFBR - 12-Bit 65MSPS +3.3V ADC | Texas Instruments
MPN: ADS5221PFBR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $12.5 | $12.50 |
| 10 | $11.25 | $112.50 |
| 100 | $9.95 | $995.00 |
| 500 | $8.8 | $4,400.00 |
| 1,000 | $7.65 | $7,650.00 |
ADS5221PFBR Overview
An ADC (analog-to-digital converter) is a data-conversion integrated circuit that translates continuous-time analog signals into discrete digital codes at a defined sample rate, enabling downstream processing by DSPs, FPGAs, or microcontrollers. In the broader taxonomy, the ADS5221 sits as a pipeline architecture ADC -> successive-approximation/pipeline/flash class -> data converter -> mixed-signal IC -> integrated circuit. Pipeline ADCs of this speed class balance conversion rate with resolution and are preferred for intermediate-frequency (IF) sampling where flash converters would be too power-hungry and SAR ADCs too slow.
Key features include flexible duty-cycle adjustment circuitry that allows the aperture delay to be tuned to the system clock, an internal reference that can be overdriven by an external source for absolute accuracy, and CMOS-compatible digital outputs. The 48-pin TQFP (PFB) package provides standard surface-mount assembly and reasonable thermal performance for the 285 mW power dissipation.
The ADS5221 uses a multi-stage pipeline architecture with digital error correction to achieve its 12-bit linearity at 65 MSPS. The flexible duty-cycle adjust input allows the user to optimize sampling instants for either internal or external clock sources, supporting both repetitive and one-shot acquisition modes. The 70 dB SNR is well-suited to communication IF-signal chains and baseband digitization in instrumentation.
Typical applications include communications IF digitization, medical imaging front-ends, CCD/CIS scanners, portable test equipment, and general-purpose high-speed data acquisition. Its single +3.3V supply and modest 285 mW power consumption make it suitable for power-sensitive portable designs that still need high dynamic range.
When designing with the ADS5221, provide a low-impedance analog input network and a clean +3.3V rail with adequate decoupling. Use the internal reference unless system calibration requires an external reference for gain stability across temperature. Observe the 48-pin TQFP thermal limits at high ambient temperature with adequate copper pour.
This page synthesizes distributor pricing, verified cross-references, and practical design notes not found in the standalone manufacturer datasheet - giving engineers a single reference for sourcing, alternatives, and integration guidance.
Drop-in alternatives for ADS5221PFBR — 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 ADS5221PFBR (same form factor and footprint) — differing in Package, Resolution, Input Type, Reference, Architecture.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ADS5220PFBRG4
✅ Drop-In✓ In Stock
$11.05 / Unit
View Datasheet →ADS5103CPFBR
✅ Drop-In✓ In Stock
$4.45 / Unit
View Datasheet →ADS5103IPFBRG4
✅ Drop-In✓ In Stock
$4.4 / Unit
View Datasheet →ADS5103CPFBRG4
✅ Drop-In✓ In Stock
$4.95 / Unit
View Datasheet →ADS5102IPFBR
✅ Drop-In✓ In Stock
$5.05 / Unit
View Datasheet →ADS5221PFBR Maximum Ratings & Electrical Characteristics
| Resolution | 12 bit |
| Sample Rate | 65 MSPS |
| Number of Channels | 1 |
| Supply Voltage | +3.3 V (single) |
| Power Dissipation | 285 mW |
| SNR | 70 dB |
| SFDR | 88 dBFS |
| DNL | 0.5 LSB |
| Input Type | Single-ended or fully differential |
| Reference | Internal or external |
| Architecture | Pipeline |
| Package | TQFP-48 (PFB) |
| Mounting Type | Surface Mount |
ADS5221PFBR Pin Configuration
| Pin 1 | NC — Not connected |
| Pin 2 | AVDD — Analog supply voltage (+3.3V) |
| Pin 3 | IN — Analog input (single-ended or positive differential) |
| Pin 4 | AIN_N — Negative analog input (differential mode) |
| Pin 5 | REFT — Top reference decoupling |
| Pin 6 | REFB — Bottom reference decoupling |
| Pin 7 | REF — Reference voltage I/O |
| Pin 8 | REFRES — Reference resistor |
| Pin 9 | REFCOMP — Reference compensation |
| Pin 10 | AVSS — Analog ground |
| Pin 11 | BIASJ — Bias junction |
| Pin 12 | CLK — Clock input |
| Pin 13 | CLKB — Complementary clock input |
| Pin 14 | DRVDD — Digital driver supply (+3.3V) |
| Pin 15 | DRVSS — Digital driver ground |
| Pin 16 | DVDD — Digital core supply (+3.3V) |
| Pin 17 | DVSS — Digital ground |
| Pin 18 | DUTY — Duty cycle adjust input |
| Pin 19 | OE — Output enable (active low) |
| Pin 20 | D0 — Digital output bit 0 (LSB) |
| Pin 21 | D1 — Digital output bit 1 |
| Pin 22 | D2 — Digital output bit 2 |
| Pin 23 | D3 — Digital output bit 3 |
| Pin 24 | D4 — Digital output bit 4 |
| Pin 25 | D5 — Digital output bit 5 |
| Pin 26 | D6 — Digital output bit 6 |
| Pin 27 | D7 — Digital output bit 7 |
| Pin 28 | D8 — Digital output bit 8 |
| Pin 29 | D9 — Digital output bit 9 |
| Pin 30 | D10 — Digital output bit 10 |
| Pin 31 | D11 — Digital output bit 11 (MSB) |
| Pin 32 | DRVSS — Digital driver ground |
| Pin 33 | DRVDD — Digital driver supply |
| Pin 34 | PD — Power down (active high) |
| Pin 35 | AVDD — Analog supply (+3.3V) |
| Pin 36 | AVSS — Analog ground |
| Pin 37 | NC — Not connected |
| Pin 38 | VREF — Voltage reference bypass |
| Pin 39 | AVSS — Analog ground |
| Pin 40 | AVDD — Analog supply (+3.3V) |
| Pin 41 | AVSS — Analog ground |
| Pin 42 | NC — Not connected |
| Pin 43 | NC — Not connected |
| Pin 44 | AVSS — Analog ground |
| Pin 45 | AVDD — Analog supply (+3.3V) |
| Pin 46 | NC — Not connected |
| Pin 47 | NC — Not connected |
| Pin 48 | NC — Not connected |
Typical Applications
ADS5221PFBR is suitable for 6 applications: Communications IF Digitization, Medical Imaging Front-End, CCD/CIS Scanner Digitization, Portable Test Equipment, Industrial Data Acquisition, Radar and Lidar Signal Processing.
Communications IF Digitization
The ADS5221PFBR's 12-bit resolution at 65 MSPS with 70 dB SNR and 88 dBFS SFDR makes it well-suited for digitizing intermediate-frequency signals in software-defined radio and cable-modem receivers. Placing the ADC directly at the IF stage replaces multiple discrete downconversion stages, reducing BOM cost and PCB area. The single +3.3V supply and 285 mW dissipation simplify thermal design in densely-packed IF chains.
Recommended
Medical Imaging Front-End
Ultrasound and other medical imaging front-ends require moderate-resolution ADCs at tens of MSPS to digitize beamformed analog channels. The ADS5221PFBR's 12-bit resolution and 65 MSPS sample rate fit ultrasound channel requirements, while its 0.5 LSB DNL ensures no missing codes across the dynamic range critical for diagnostic accuracy. The flexible duty-cycle adjust input supports synchronization to system clock for coherent beamforming.
Recommended
CCD/CIS Scanner Digitization
Linear-array CCD and CIS scanners operating at video rates require ADCs with sample rates of 20-65 MSPS and good dynamic range. The ADS5221PFBR's 70 dB SNR captures the full tonal range of scanner outputs, and the flexible analog input (single-ended or differential) accepts either CIS direct outputs or CCD post-amplifier outputs. The 48-pin TQFP (PFB) package is well-suited to the compact scanner analog front-end PCB.
Recommended
Portable Test Equipment
Handheld oscilloscopes, spectrum analyzers, and data loggers digitize analog signals at tens of MSPS. The ADS5221PFBR's 285 mW dissipation and single +3.3V supply allow battery-powered operation with reasonable thermal envelope, while the 70 dB SNR provides accurate amplitude measurements. The internal reference option reduces external component count for compact portable form factors.
Recommended
Industrial Data Acquisition
Multi-channel industrial data-acquisition systems digitize sensor signals at rates up to 65 MSPS per channel. The ADS5221PFBR's flexible duty-cycle adjust input supports time-interleaved operation with multiple ADCs, while the 0.5 LSB DNL guarantees no missing codes for accurate measurement. Industrial-grade temperature range and 48-pin TQFP (PFB) robustness suit factory-floor deployment.
Recommended
Radar and Lidar Signal Processing
Automotive and industrial radar systems digitize IF outputs from mixer stages at baseband rates up to 65 MSPS. The ADS5221PFBR's 88 dBFS SFDR ensures spurious-free capture of small targets adjacent to large clutter returns - critical for radar detection dynamic range. The single +3.3V supply integrates well with automotive ECU power rails. Differential analog input rejects common-mode noise from switching power converters.
Recommended
Recommended Products Summary
Engineering reference data for ADS5221PFBR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADS5220PFBRG4 | ADS5103CPFBR | ADS5103IPFBRG4 | ADS5102IPFBR |
|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | TQFP-48 (PFB) | TQFP-48 (PFB) - same | TQFP-48 (PFB) - same | TQFP-48 (PFB) - same | TQFP-48 (PFB) - same |
| Resolution | 12 bit | 12 bit | 10 bit | 10 bit | 10 bit |
| Supply Voltage | +3.3V single | +3.3V single | +3.3V single | +3.3V single | +3.3V single |
Key Differentiators
- Highest sample rate in TQFP-48 (PFB) 12-bit TI ADC family (vs ADS5220PFBRG4)
- 12-bit resolution in same TQFP-48 (PFB) footprint as 10-bit family (vs ADS5103CPFBR)
- Pipeline architecture optimized for sustained 65 MSPS throughput (vs ADS5102IPFBR)
Design Notes
The ADS5221PFBR requires separate analog (AVDD) and digital (DRVDD, DVDD) +3.3V supplies, each with their own ground returns (AVSS, DRVSS, DVSS). Place 0.1 uF ceramic decoupling capacitors as close as possible to each supply pin, with a 10 uF bulk tantalum or ceramic on each supply rail. Star-ground the analog and digital grounds at a single point under the IC to avoid ground-loop noise coupling into the analog input.
Use a solid ground plane on the layer directly under the capacitor as close as possible to each supply pin, with a 10 uF bulk tantalum or ceramic on each supply rail. Star-ground the analog and digital grounds at a single point under the IC to avoid ground-loop noise coupling into the analog input. Keep digital output traces short and route them away from the analog input pins to minimize digital-noise coupling into the analog signal path. Place the REFT, REFB, and REF decoupling capacitors immediately adjacent to their respective pins.
Drive the CLK input with a low-jitter, fast-edge clock source - aperture jitter directly degrades SNR according to SNR(dB) = 20*log10(1 / (2*pi*f_in*sigma_t)). For 12.5 MHz input and 1 ps output jitter on the source clock, the theoretical SNR limit from jitter alone is 77 dB. Use a clock buffer with sub-picosecond additive jitter for best performance. The CLKB complementary input should be AC-bypassed to ground if unused.
Do not operate the ADS5221PFBR without proper power-supply sequencing - DRVDD and DVDD must be present before or simultaneously with AVDD to avoid latch-up. Do not drive the analog input beyond the AVDD+0.3V absolute maximum, even during power-up transients. If using the internal reference, do not load the REF pin with external circuitry; if using an external reference, drive REF through a buffer to avoid degrading the reference loop stability.
Compliance Information
Compliance data not explicitly provided in verified web data; RoHS, REACH, lead-free, halogen-free, and conflict-minerals status marked as unknown pending verification. AEC-Q100 not applicable - this is an industrial/consumer grade ADC.
