LTC2242IUP-12 - 12-Bit, 250Msps ADC | Analog Devices
MPN: LTC2242IUP-12 ✓ AktifLTC2242IUP-12 Ringkasan
An ADC (analog-to-digital converter) is a semiconductor device that converts continuous analog signals into discrete digital codes, serving as the critical interface between the analog front-end (amplifiers, mixers, sensors) and the digital back-end (FPGA, DSP, processor). High-speed pipeline ADCs at the 100-500 Msps tier are widely used in communications, test and measurement, and defense systems where signal fidelity at IF and baseband frequencies is paramount.
Key features of the LTC2242IUP-12 include a 1.2 GHz full-power input bandwidth sample-and-hold, single 2.5 V supply operation, low 740 mW power consumption, plus selectable LVDS, CMOS, or demultiplexed CMOS output formats for flexible FPGA/DSP/ASIC interfacing. The exposed-pad QFN-64 package enables efficient thermal dissipation for the 740 mW dissipation, allowing sustained operation at the 250 Msps full sample rate in compact layouts.
The device utilizes a multi-stage pipelined architecture with proprietary calibration, achieving an excellent linearity/spec tradeoff versus lower-speed successive-approximation register (SAR) ADCs. The ultralow jitter enables undersampling of IF frequencies well above the Nyquist limit, relaxing the analog anti-alias filter design and reducing analog front-end cost. Internal references and a flexible clock input simplify board-level integration.
Typical applications include cellular basestation receivers, software-defined radios, set-top box and cable infrastructure, test and measurement instrumentation, and radar/sonar intermediate-frequency digitizers. The wide input bandwidth makes the LTC2242IUP-12 particularly attractive for undersampling leading signals where the analog front-end cost dominates.
When designing with this ADC, provide a low-noise, low-jitter clock encode to minimize aperture-jitter degradation of SNR, and follow Analog Devices recommended PCB layout for the exposed pad to maintain the 740 mW thermal budget. Output format selection (LVDS vs CMOS) should be chosen to match the downstream FPGA/ASIC capability.
This page synthesizes distributor pricing, drop-in same-package alternatives, and design considerations not found in the manufacturer datasheet to accelerate component selection.
Pilihan pengganti yang segera untuk LTC2242IUP-12 — sama paket, pin-pin kompatibel. Bahagian paket yang berbeza memerlukan kerja ulang PCB diasingkan.
Varietas dalam siri ini
Model serupa yang kompatibel dengan pengganti yang segera LTC2242IUP-12 (sama faktor bentuk dan kaki) — berbeza dalam Package, SNR, Sample Rate, RoHS Status, SFDR.
LTC2242CUP-12
✅ Masuk Drop-In📋 Alternatif rujukan (tidak dalam katalog)
LTC2241IUP-12
✅ Masuk Drop-InHubungi untuk harga
Lihat Datasheet →LTC2240IUP-10
✅ Masuk Drop-InHubungi untuk harga
Lihat Datasheet →LTC2242IUP-12#PBF
✅ Masuk Drop-In📋 Alternatif rujukan (tidak dalam katalog)
LTC2221CUP
✅ Masuk Drop-InHubungi untuk harga
Lihat Datasheet →LTC2242IUP-12 Penilaian maksimum & Ciri-ciri Elektrik
| Pemecahkatan | 12 bits |
| Sample Rate | 250 Msps (250,000 kSamples/sec) |
| Architecture | Pipelined |
| Number of Inputs | 1 |
| Input Bandwidth (Full Power) | 1.2 GHz |
| SNR | 65.4 dB (typ) / 60.5 dB (QFN datasheet char.) |
| SFDR | 78 dB |
| Aperture Jitter | 95 fs RMS |
| Tegangan Pemberi Arus | 2.5 V (single) |
| Power Dissipation | 740 mW |
| Output Format | LVDS / CMOS / Demultiplexed CMOS |
| Kemasan | 64-QFN (9x9 mm) with exposed pad |
| Operating Temperature Range (Industrial) | -40C to +85C |
| Screening Level | Industrial (-I suffix) |
| Status RoHS | Compliant (PBF suffix denotes Pb-free) |
Panduan Konfigurasi Pin LTC2242IUP-12 64-qfn (9x9 mm) with exposed pad
Konfigurasi pin untuk LTC2242IUP-12 (64-qfn (9x9 mm) with exposed pad pakai). Komponen analog ini mempunyai pin masukan, keluaran, dan kuasa. Rujuk dokumen pengeluar untuk konfigurasi pengecualian, pemulihan, dan pin aktifkan. Ideal untuk pengawasan isyarat dan litar pengukur.
Tiada data garisan pin yang diperoleh untuk LTC2242IUP-12.
Rujuk kepada lembaran data untuk konfigurasi pin penuh.
Aplikasi Biasa
LTC2242IUP-12 patut untuk 6 aplikasis: Cellular Basestation Receivers, Software Defined Radio (SDR), Test and Measurement Instrumentation, Radar and Sonar IF Digitizers, Cable and Set-Top Box Infrastructure, Medical Imaging Digitizers.
Cellular Basestation Receivers
The LTC2242IUP-12's 250 Msps sample rate and 65.4 dB SNR at Nyquist are well matched to digitize multi-carrier GSM, W-CDMA, and LTE intermediate-frequency signals at 70-184 MHz IF. Its 1.2 GHz full-power input bandwidth allows direct IF sampling without an analog downconversion mixer, reducing the receiver BOM cost. The single 2.5 V supply and 740 mW dissipation fit standard basestation card thermal budgets.
Disebarkan
Software Defined Radio (SDR)
The ultralow 95 fs RMS aperture jitter enables clean undersampling of IF frequencies well above the 125 MHz Nyquist, allowing the LTC2242IUP-12 to digitize wide-bandwidth SDR signals directly. The selectable LVDS, CMOS, and demultiplexed CMOS outputs interface directly to FPGAs used in SDR platforms (Xilinx Spartan-6, Altera Cyclone). The exposed-pad QFN-64 package supports field-deployed radio thermal requirements.
Disebarkan
Test and Measurement Instrumentation
The 78 dB SFDR and 65.4 dB SNR suit the LTC2242IUP-12 for digitizing signals in spectrum analyzers, oscilloscopes, and arbitrary waveform generator feedback loops. The 1.2 GHz input bandwidth captures overshoot and ringing on high-speed pulse waveforms accurately, while the 12-bit resolution provides sufficient dynamic range for production-test ATE. LVDS outputs minimize digital switching noise coupling into the analog input signal path.
Disebarkan
Radar and Sonar IF Digitizers
Defense and commercial radar systems require digitizing pulsed IF signals centered at 50-100 MHz with excellent spurious-free dynamic range. The LTC2242IUP-12's 78 dB SFDR ensures small returns are not masked by large clutter signals, while the 250 Msps rate captures pulse rise times without aliasing. The exposed-pad QFN-64 enables conduction-cooled chassis mounting common in radar systems.
Disebarkan
Cable and Set-Top Box Infrastructure
Digitizing upstream and downstream cable channels at IF frequencies benefits from the LTC2242IUP-12's 1.2 GHz input bandwidth and 65.4 dB SNR. Single 2.5 V supply operation simplifies the cable modem's power tree, while the selectable demultiplexed CMOS outputs reduce FPGA pin count. The 740 mW dissipation is acceptable in thermally-managed headend equipment.
Disebarkan
Medical Imaging Digitizers
Ultrasound and other medical imaging systems digitize IF signals from beamformer outputs, requiring both wide bandwidth and excellent linearity. The LTC2242IUP-12's 250 Msps sample rate and 78 dB SFDR support multi-channel beamformer digitization, while the industrial temperature grade (-40C to +85C) suits clinical equipment thermal specs. The compact QFN-64 (9x9) package supports high channel density in portable ultrasound carts.
Disebarkan
Ringkasan Produk Disebarkan
Data referensi kejuruteraan untuk LTC2242IUP-12 — perbandingan, panduan rancangan, dan maklumat kesediaan
Panduan Pilihan
Perbandingan dengan Gantian
| Parametr | Produk Ini | LTC2242CUP-12 | LTC2241IUP-12 | LTC2240IUP-10 | LTC2242IUP-12#PBF | LTC2221CUP |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 64-QFN (9x9) | 64-QFN (9x9) - same | 64-QFN (9x9) - same | 64-QFN (9x9) - same | 64-QFN (9x9) - same | 64-QFN (9x9) - same |
| Resolution | 12 bits | 12 bits | 12 bits | 10 bits | 12 bits | 12 bits |
| Sample Rate | 250 Msps | 250 Msps | 200 Msps | 105 Msps | 250 Msps | 10 Msps |
| Operating Temperature | -40C to +85C (Industrial) | 0C to +70C (Commercial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | 0C to +70C (Commercial) |
Penyeberangsung Jelas
- Highest sample rate in the LTC2242 64-QFN family (vsLTC2241IUP-12 (200 Msps))
- Industrial temperature grade versus commercial temp variant (vsLTC2242CUP-12)
- Higher resolution than 10-bit comparator ADC alternative (vsLTC2240IUP-10)
Catatan Desain
Estimated: The LTC2242IUP-12's exposed thermal pad must be soldered to a continuous ground plane with thermal vias to dissipate the 740 mW at 250 Msps full sample rate. Recommended via pattern is 5x5 array of 0.3 mm vias on 1.2 mm pitch connecting to inner ground planes. Per Analog Devices evaluation board layout, the analog input trace should be a 50-ohm controlled-impedance microstrip and the clock input trace should be length-matched to minimize aperture-jitter-induced SNR degradation.
Use a low-noise LDO (e.g. LT3042 or LT3045) for the 2.5 V analog supply and a separate filter for the digital supply to avoid digital switching noise coupling into the analog front-end. Estimated: with 740 mW dissipation and 2.5 V supply, the input current is approximately 296 mA; ensure the supply trace is sized for this current with adequate decoupling (10 uF bulk + 0.1 uF + 1 nF ceramic capacitors at each supply pin).
Clock jitter is the dominant SNR limit for the LTC2242IUP-12 at high input frequencies. The 95 fs RMS internal aperture jitter requires a clock source with sub-200 fs RMS jitter to preserve datasheet performance. Use a dedicated low-jitter clock buffer (e.g. LTC6957 or equivalent) and route the clock trace as a 50-ohm controlled-impedance line away from noisy digital outputs to minimize crosstalk.
Do not operate the LTC2242IUP-12 above 250 Msps even though the analog input bandwidth extends to 1.2 GHz; the device is specified only at 250 Msps sample rate. Mixing LVDS and CMOS output modes simultaneously is not supported per Analog Devices datasheet (224212fc). When using demultiplexed CMOS mode, ensure the FPGA can accept the higher pin-count interface and verify timing margins at the full 250 Msps data rate.
Maklumat Kesediaan
Pb-free version available as LTC2242IUP-12#PBF per DigiKey listing. RoHS compliance applies to PBF/TRPBF suffix versions. Halogen free status not explicitly stated in provided data.
