ADS5521IPAPRG4 - 12-Bit 105MSPS Pipeline ADC | Texas Instruments
MPN: ADS5521IPAPRG4 ✓ Hoạt độngADS5521IPAPRG4 Tóm tắt
An analog-to-digital converter (ADC) is a semiconductor device that transforms continuously varying analog signals into discrete digital codes at a defined sampling rate. Pipelined ADCs use multiple cascaded low-resolution stages, each sampling one clock-cycle later than the previous stage, to achieve high sample rates (tens to hundreds of MSPS) while keeping per-stage conversion speed moderate. Pipelined ADCs sit in the signal chain hierarchy between successive-approximation (SAR) ADCs (lower power, lower speed, kilohertz to low MSPS) and flash ADCs (highest speed, lowest resolution, highest power). They are the workhorse of high-speed digital signal acquisition in communications, instrumentation, defense, and medical imaging systems.
Key specifications from the manufacturer datasheet include 105 MSPS maximum sample rate, 12-bit resolution, 2.3 VPP differential input range, 3.3 V single-supply analog operation, and 564 mW typical analog power dissipation. The differential input device supports high spurious-free dynamic range (SFDR) and high signal-to-noise ratio (SNR) at 100 MHz input frequency, making it well suited for digitizing wideband IF signals. Industrial temperature range (-40C to +85C) and Pb-free / green RoHS-compliant packaging suit harsh-environment deployments.
The ADS5521 uses a multi-stage pipelined architecture with on-chip sample-and-hold, internal voltage reference, and digital error correction. CMOS outputs deliver LVCMOS-compatible levels; optional LVDS output mode is not used on the PAP package. The pipelined topology provides one clock cycle of pipeline latency and inherent INL/DNL linearity suitable for communications signal chains.
Typical applications include wireless communications IF sampling, medical imaging (ultrasound beamforming), radar signal processing, defense electronics (EW / DRFM), cable-headend infrastructure (QAM/DVB-C digitizers), and high-speed data acquisition cards. The wide input bandwidth and high SFDR at 100 MHz IF make the part especially attractive for direct-IF sampling receivers.
When designing with this ADC, allocate a quiet analog 3.3V rail separate from the digital 3.3V supply, decouple the AVDD/DRVDD pins with 0.1 uF ceramic plus 10 uF bulk capacitors, and provide a low-jitter clock source - aperture jitter is the dominant SNR-limiting factor at 100 MHz IF.
This page synthesizes distributor pricing, drop-in alternates, and practical design guidance not collected in the manufacturer datasheet.
Bộ thay thế dễ dàng lắp đặt cho ADS5521IPAPRG4 — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với ADS5521IPAPRG4 (cùng hình factor và footprint) — khác nhau ở Analog Power Dissipation, Internal Voltage Reference, Number of Input Channels, Package, Resolution.
ADS5521IPAPG4
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ADS5520IPAP
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ADS5522IPAP
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ADS5521IPAP
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ADS5520IPAPG4
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ADS5522IPAPG4
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ADS5521IPAPRG4 Tỷ lệ tối đa & tính chất điện
| Độ phân giải | 12 bit |
| Sample Rate | 105 MSPS (max) |
| Architecture | Pipelined |
| Number of Input Channels | 1 (differential) |
| Input Voltage Range (Differential) | 2.3 VPP |
| Analog Supply Voltage | 3.3 V (single supply) |
| Digital Supply Voltage | 3.3 V (DRVDD) |
| Internal Voltage Reference | Yes (integrated) |
| Analog Power Dissipation | 564 mW (typical, 105 MSPS) |
| Khoảng nhiệt độ hoạt động | -40C to +85C (industrial) |
| Hộp | 64-pin HTQFP (PAP), 10x10 mm |
| Kiểu lắp đặt | Surface Mount |
| Trạng thái RoHS | Compliant (Pb-free / green) |
Cấu hình chân ADS5521IPAPRG4
| Chân 1 | DRGND — Digital output ground |
| Chân 2 | DRVDD — Digital output supply (3.3 V) |
| Chân 3 | D11 — Data output MSB |
| Chân 4 | D10 — Data output |
| Chân 5 | D9 — Data output |
| Chân 6 | D8 — Data output |
| Chân 7 | D7 — Data output |
| Chân 8 | D6 — Data output |
| Chân 9 | D5 — Data output |
| Chân 10 | D4 — Data output |
| Chân 11 | D3 — Data output |
| Chân 12 | D2 — Data output |
| Chân 13 | D1 — Data output |
| Chân 14 | D0 — Data output LSB |
| Chân 15 | DRGND — Digital output ground |
| Chân 16 | DRVDD — Digital output supply (3.3 V) |
| Chân 17 | AVDD — Analog supply (3.3 V) |
| Chân 18 | AVSS — Analog ground |
| Chân 19 | INP — Differential analog input, positive |
| Chân 20 | INN — Differential analog input, negative |
| Chân 21 | VCM — Common-mode voltage output |
| Chân 22 | REFT — Top reference decoupling |
| Chân 23 | REFB — Bottom reference decoupling |
| Chân 24 | AVSS — Analog ground |
| Chân 25 | AVDD — Analog supply (3.3 V) |
| Chân 26 | AVSS — Analog ground |
| Chân 27 | AVDD — Analog supply (3.3 V) |
| Chân 28 | AVSS — Analog ground |
| Chân 29 | AVDD — Analog supply (3.3 V) |
| Chân 30 | AVSS — Analog ground |
| Chân 31 | AVDD — Analog supply (3.3 V) |
| Chân 32 | AVSS — Analog ground |
| Chân 33 | NC — Not connected (per datasheet) |
| Chân 34 | AVSS — Analog ground |
| Chân 35 | CLK — Sample clock input |
| Chân 36 | CLKB — Complementary clock input (tie to CLK if unused) |
| Chân 37 | AVSS — Analog ground |
| Chân 38 | AVDD — Analog supply (3.3 V) |
| Chân 39 | AVSS — Analog ground |
| Chân 40 | SEN — Sample enable (active high) |
| Chân 41 | SCLK — Serial programming clock |
| Chân 42 | SDATA — Serial programming data |
| Chân 43 | SDOUT — Serial programming data output |
| Chân 44 | RESET — Hardware reset (active low) |
| Chân 45 | PD — Power-down (active high) |
| Chân 46 | AVSS — Analog ground |
| Chân 47 | AVDD — Analog supply (3.3 V) |
| Chân 48 | AVSS — Analog ground |
| Chân 49 | NC — Not connected (per datasheet) |
| Chân 50 | AVSS — Analog ground |
| Chân 51 | AVDD — Analog supply (3.3 V) |
| Chân 52 | AVSS — Analog ground |
| Chân 53 | AVDD — Analog supply (3.3 V) |
| Chân 54 | AVSS — Analog ground |
| Chân 55 | AVDD — Analog supply (3.3 V) |
| Chân 56 | AVSS — Analog ground |
| Chân 57 | AVDD — Analog supply (3.3 V) |
| Chân 58 | AVSS — Analog ground |
| Chân 59 | AVDD — Analog supply (3.3 V) |
| Chân 60 | AVSS — Analog ground |
| Chân 61 | DRVDD — Digital output supply (3.3 V) |
| Chân 62 | DRGND — Digital output ground |
| Chân 63 | NC — Not connected (per datasheet) |
| Chân 64 | PAD — Exposed thermal pad (connect to AVSS) |
Ứng dụng tiêu biểu
ADS5521IPAPRG4 phù hợp cho 6 Áp dụngs: Wireless Communications IF Sampling, Ultrasound Beamforming Receivers, Radar and Defense EW Receivers, Cable-Headend QAM / DVB-C Digitizers, High-Speed Data Acquisition Cards, Test and Measurement Instrumentation.
Wireless Communications IF Sampling
The ADS5521IPAPRG4's 105 MSPS sample rate and 2.3 VPP differential input make it well-suited for direct-IF sampling in wireless base-station and software-defined-radio receivers. At a 100 MHz IF, the converter preserves high SFDR, which is critical for separating adjacent WCDMA / LTE channels. The integrated sample-and-hold and internal reference reduce the analog front-end BOM compared to discrete ADC designs. Pair the ADC with a low-jitter clock generator such as the CDCM61004 or LMK04828 to meet the aperture-jitter budget at 100 MHz IF.
Được đề xuất
Ultrasound Beamforming Receivers
In medical ultrasound systems the ADS5521IPAPRG4 serves as the per-channel high-speed ADC in the receive beamformer, digitizing the post-TGC signal at 105 MSPS with 12-bit resolution. The differential input rejects common-mode noise from the long transducer cables, while the pipelined architecture delivers low latency suitable for real-time imaging. Industrial temperature range (-40C to +85C) supports portable-cart and bedside-cart deployments. Buffer the digital outputs through LVCMOS fanout such as SN74AVC16T245 to drive FPGAs for beamforming DSP.
Được đề xuất
Radar and Defense EW Receivers
Electronic-warfare and radar-receiver subsystems rely on wideband ADCs to capture pulsed-RF and frequency-agile signals. The ADS5521IPAPRG4's 105 MSPS sample rate (Nyquist to 52.5 MHz baseband or IF-sampling well beyond that) plus 2.3 VPP differential input suit narrow-band IF digitizers used in ESM/ELINT receivers. Low aperture jitter preserves SNR on short radar pulses where the time-domain accuracy is critical. The 64-HTQFP industrial-temperature package supports ground-mobile and shipboard platforms.
Được đề xuất
Cable-Headend QAM / DVB-C Digitizers
Cable headend receivers digitize 44 MHz-bandwidth downstream channels. The ADS5521IPAPRG4's 105 MSPS sample rate supports oversampling the 6 MHz / 8 MHz QAM channels while leaving guard-band margin, and its 12-bit resolution preserves the carrier-to-noise margin required for 256-QAM and 1024-QAM constellations. Differential input rejects common-mode hum from the headend chassis. The 564 mW typical dissipation simplifies the host-board thermal budget compared with higher-speed flash parts.
Được đề xuất
High-Speed Data Acquisition Cards
PCIe and PXIe data-acquisition cards use the ADS5521IPAPRG4 as the per-channel digitizer for general-purpose waveform capture. The 105 MSPS sample rate captures repetitive transients and single-shot waveforms up to 52 MHz bandwidth, while the 12-bit resolution suits general lab use. Industrial temperature rating and 64-HTQFP (10x10 mm) footprint simplify card layout and thermal management. Buffer the digital outputs to a FPGA for storage and post-processing.
Được đề xuất
Test and Measurement Instrumentation
Digital oscilloscopes, spectrum analyzers, and signal-integrity test equipment use the ADS5521IPAPRG4 in the analog front end. The 105 MSPS sample rate captures repetitive waveforms, and the 2.3 VPP differential input matches typical probe-buffer outputs (such as the THS4631). Industrial temperature grade and Pb-free packaging meet the reliability expectations of benchtop and ATE instrumentation. The exposed thermal pad supports continuous operation at full 105 MSPS without thermal throttling.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho ADS5521IPAPRG4 — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | ADS5521IPAPG4 | ADS5520IPAP | ADS5522IPAP | ADS5521IPAP |
|---|---|---|---|---|---|
| Package | 64-HTQFP (PAP), 10x10 mm | 64-HTQFP (PAP), 10x10 mm | 64-HTQFP (PAP), 10x10 mm | 64-HTQFP (PAP), 10x10 mm | 64-HTQFP (PAP), 10x10 mm |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Resolution | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit |
| Sample Rate | 105 MSPS | 105 MSPS | 125 MSPS | 80 MSPS | 105 MSPS |
| Input Range | 2.3 VPP differential | 2.3 VPP differential | 2.3 VPP differential | 2.3 VPP differential | 2.3 VPP differential |
| Analog Supply | 3.3 V | 3.3 V | 3.3 V | 3.3 V | 3.3 V |
| Internal Reference | Yes | Yes | Yes | Yes | Yes |
| Operating Temperature Range | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
Bảo phân biệt quan trọng
- Best balance of 105 MSPS sample rate and 12-bit resolution in the ADS552x family (vsADS5522IPAP)
- Pb-free / RoHS-compliant tape-and-reel packaging (RG4 suffix) (vsADS5521IPAP)
- Internal voltage reference eliminates external reference IC (vsExternal-reference ADCs in the same speed class)
Ghi chú thiết kế
Power the AVDD analog supply from a low-noise 3.3 V LDO such as the TPS7A4701RGWR rather than directly from a switching converter. The ADS5521IPAPRG4's SFDR and SNR are highly sensitive to supply noise on AVDD; even tens of microvolts of ripple can degrade SFDR by 5-10 dB at 100 MHz IF. Decouple each AVDD pin with a 0.1 uF X7R ceramic placed within 3 mm of the pin plus a 10 uF bulk capacitor on the analog supply plane.
The ADS5521IPAPRG4 dissipates roughly 564 mW of analog power at 105 MSPS, which is modest but not negligible. Solder the exposed thermal pad (pin 64 / PAD) to a continuous AVSS copper pour on the top and inner layers with at least 16 thermal vias to a bottom ground plane. Without proper thermal pad soldering the junction-to-ambient thermal resistance rises and can degrade long-term reliability near the upper end of the -40C to +85C industrial range.
Aperture jitter, not the ADC's intrinsic SNR, is the dominant noise source at high input frequencies. The SNR degradation with input frequency follows SNR_jitter = 20*log10(2*pi*fIN*tJ). For 100 MHz IF and 1 ps RMS clock jitter the SNR floor is approximately 64 dB. Use a low-jitter clock generator such as the CDCM61004 or LMK04828; avoid distributing the sample clock through long FR4 traces or through FPGAs with high additive jitter.
Route the differential analog inputs INP/INN as a tightly-coupled 100 ohm differential pair with ground-fill on each side. The 2.3 VPP differential input is sensitive to common-mode pickup; route INP/INN directly from the output of a differential ADC driver (such as the THS4511) with the shortest possible trace length. Keep digital output buses (D0-D11) physically separated from the analog input pair to avoid digital-to-analog coupling.
Terminate the LVCMOS digital outputs (D0-D11) with a 100 ohm series resistor close to the ADC and a 50 ohm to 100 ohm termination at the FPGA side to control ringing and overshoot at 105 MSPS. Series termination minimizes reflections without loading the ADC outputs. Use source-synchronous clocking (CLK to FPGA with matched trace length) to achieve reliable capture of the parallel data bus.
Thông tin tuân thủ
Pb-free / green per TI product page. AEC-Q100 not applicable (industrial / consumer ADC, not automotive qualified). Conflict-minerals compliance per TI declaration.
