ADS5221PFBR - 12-Bit 65MSPS +3.3V ADC | Texas Instruments
料号： ADS5221PFBR ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 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 概述
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.
直接替换替代料： ADS5221PFBR ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： ADS5221PFBR （相同外形与封装尺寸） ——差异在于 Package, Resolution, Input Type, Reference, Architecture.
快速对比工具——选择替代料号进行并排对比：
ADS5220PFBRG4
✅ 直接替换✓ 有现货
$11.05 / 个
查看数据手册 →ADS5103CPFBR
✅ 直接替换✓ 有现货
$4.45 / 个
查看数据手册 →ADS5103IPFBRG4
✅ 直接替换✓ 有现货
$4.4 / 个
查看数据手册 →ADS5103CPFBRG4
✅ 直接替换✓ 有现货
$4.95 / 个
查看数据手册 →ADS5102IPFBR
✅ 直接替换✓ 有现货
$5.05 / 个
查看数据手册 →ADS5221PFBR 最大额定值与电气特性
| 分辨率 | 12 bit |
| Sample Rate | 65 MSPS |
| Number of Channels | 1 |
| 电源电压 | +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 |
| 封装 | TQFP-48 (PFB) |
| 安装类型 | Surface Mount |
ADS5221PFBR 引脚配置
| 引脚 1 | NC — Not connected |
| 引脚 2 | AVDD — Analog supply voltage (+3.3V) |
| 引脚 3 | IN — Analog input (single-ended or positive differential) |
| 引脚 4 | AIN_N — Negative analog input (differential mode) |
| 引脚 5 | REFT — Top reference decoupling |
| 引脚 6 | REFB — Bottom reference decoupling |
| 引脚 7 | REF — Reference voltage I/O |
| 引脚 8 | REFRES — Reference resistor |
| 引脚 9 | REFCOMP — Reference compensation |
| 引脚 10 | AVSS — Analog ground |
| 引脚 11 | BIASJ — Bias junction |
| 引脚 12 | CLK — Clock input |
| 引脚 13 | CLKB — Complementary clock input |
| 引脚 14 | DRVDD — Digital driver supply (+3.3V) |
| 引脚 15 | DRVSS — Digital driver ground |
| 引脚 16 | DVDD — Digital core supply (+3.3V) |
| 引脚 17 | DVSS — Digital ground |
| 引脚 18 | DUTY — Duty cycle adjust input |
| 引脚 19 | OE — Output enable (active low) |
| 引脚 20 | D0 — Digital output bit 0 (LSB) |
| 引脚 21 | D1 — Digital output bit 1 |
| 引脚 22 | D2 — Digital output bit 2 |
| 引脚 23 | D3 — Digital output bit 3 |
| 引脚 24 | D4 — Digital output bit 4 |
| 引脚 25 | D5 — Digital output bit 5 |
| 引脚 26 | D6 — Digital output bit 6 |
| 引脚 27 | D7 — Digital output bit 7 |
| 引脚 28 | D8 — Digital output bit 8 |
| 引脚 29 | D9 — Digital output bit 9 |
| 引脚 30 | D10 — Digital output bit 10 |
| 引脚 31 | D11 — Digital output bit 11 (MSB) |
| 引脚 32 | DRVSS — Digital driver ground |
| 引脚 33 | DRVDD — Digital driver supply |
| 引脚 34 | PD — Power down (active high) |
| 引脚 35 | AVDD — Analog supply (+3.3V) |
| 引脚 36 | AVSS — Analog ground |
| 引脚 37 | NC — Not connected |
| 引脚 38 | VREF — Voltage reference bypass |
| 引脚 39 | AVSS — Analog ground |
| 引脚 40 | AVDD — Analog supply (+3.3V) |
| 引脚 41 | AVSS — Analog ground |
| 引脚 42 | NC — Not connected |
| 引脚 43 | NC — Not connected |
| 引脚 44 | AVSS — Analog ground |
| 引脚 45 | AVDD — Analog supply (+3.3V) |
| 引脚 46 | NC — Not connected |
| 引脚 47 | NC — Not connected |
| 引脚 48 | NC — Not connected |
典型应用
ADS5221PFBR 适用于 6 应用s: 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.
推荐
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.
推荐
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.
推荐
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.
推荐
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.
推荐
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.
推荐
推荐产品汇总
工程参考数据： ADS5221PFBR ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | 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 |
关键差异点
- Highest sample rate in TQFP-48 (PFB) 12-bit TI ADC family （对比 ADS5220PFBRG4)
- 12-bit resolution in same TQFP-48 (PFB) footprint as 10-bit family （对比 ADS5103CPFBR)
- Pipeline architecture optimized for sustained 65 MSPS throughput （对比 ADS5102IPFBR)
设计说明
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.
合规信息
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.
