LTC2242CUP-10 - 10-Bit 250Msps ADC, 64-QFN | Analog Devices
MPN: LTC2242CUP-10 ✓ Hoạt độngLTC2242CUP-10 Tóm tắt
What is a high-speed pipelined ADC? A pipelined analog-to-digital converter is a converter architecture that uses multiple low-resolution flash stages in cascade, with each stage converting a portion of the input while the next stage samples the residue. This architecture achieves high sample rates (tens to hundreds of Msps) at moderate resolution (8-14 bits) with low latency and small die area. Pipelined ADCs sit in the hierarchy: ADC -> data converter -> signal chain IC -> semiconductor. They are the workhorse of communications infrastructure, radar, and test instrumentation where digitizing IF/RF signals at high dynamic range is required.
Key differentiating specifications include 95 fsRMS aperture jitter (enabling excellent IF undersampling noise performance), 1.2 GHz full-power input bandwidth, and 740 mW typical power dissipation. The pipelined core is preceded by a wideband track-and-hold, supporting AC-coupled or DC-coupled single-ended differential inputs through an external driver. A separate output supply (1.5 V to 3.3 V) decouples the noisy digital supply from the analog domain.
Typical applications include cellular basestation receivers, cable modem head-ends, radar and lidar digitizers, medical imaging front-ends, and high-speed data acquisition cards. The 78 dB SFDR makes the LTC2242-10 particularly suitable for multi-carrier communications where intermodulation distortion directly limits channel capacity.
When designing with this device, allocate a quiet analog ground plane and decouple AVDD with 10 uF tantalum in parallel with 0.1 uF ceramic placed within 5 mm of the supply pins. The exposed thermal pad must be soldered to a ground copper pour of at least 1 square inch to keep junction temperature rise within safe limits at full 250 Msps operation.
Bộ thay thế dễ dàng lắp đặt cho LTC2242CUP-10 — 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 LTC2242CUP-10 (cùng hình factor và footprint) — khác nhau ở Package, Sample Rate, Architecture, Resolution, SNR.
LTC2242IUP-10
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →LTC2242CUP-10#PBF
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
LTC2241CUP-10
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →LTC2240CUP-10
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
LTC2241IUP-12
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →LTC2242CUP-10 Tỷ lệ tối đa & tính chất điện
| Độ phân giải | 10 bit |
| Sample Rate | 250 Msps |
| Number of Input Channels | 1 |
| Architecture | Pipelined |
| Input Type | Single-ended / Differential (with external driver) |
| SNR | 60.5 dB |
| SFDR | 78 dB |
| Aperture Jitter | 95 fsRMS |
| Full-Power Input Bandwidth | 1.2 GHz |
| Analog Supply Voltage | 2.5 V |
| Output Supply Voltage | 1.5 V to 3.3 V |
| Power Dissipation | 740 mW |
| Output Interface | LVDS / CMOS / Demultiplexed CMOS |
| Nhiệt độ hoạt động | 0 C to +70 C (Commercial, C grade) |
| Hộp | 64-QFN (9x9 mm) with exposed pad |
| Kiểu lắp đặt | Surface Mount |
| Trạng thái RoHS | Compliant (PBF suffix) |
Cấu hình chân LTC2242CUP-10
| Chân 1 | INA+ — Differential analog input positive |
| Chân 2 | INA- — Differential analog input negative |
| Chân 3 | CLK+ — Sample clock input positive |
| Chân 4 | CLK- — Sample clock input negative |
| Chân 5 | GND — Analog ground |
| Chân 6 | AVDD — Analog 2.5V supply |
| Chân 7 | AVDD — Analog 2.5V supply |
| Chân 8 | VREF — Voltage reference decoupling |
| Chân 9 | SENSE — Reference mode select (AVDD/ground) |
| Chân 10 | GND — Analog ground |
| Chân 11 | OF- — Output format select (active low) |
| Chân 12 | MODE — LVDS/CMOS mode select |
| Chân 13 | OVDD — Output driver supply (1.5V-3.3V) |
| Chân 14 | GND — Digital ground |
| Chân 15 | OE — Output enable |
| Chân 16 | D0-/D0 — LVDS data output bit 0 (or CMOS) |
| Chân 17 | D1-/D1 — LVDS data output bit 1 |
| Chân 18 | D2-/D2 — LVDS data output bit 2 |
| Chân 19 | D3-/D3 — LVDS data output bit 3 |
| Chân 20 | D4-/D4 — LVDS data output bit 4 |
| Chân 21 | D5-/D5 — LVDS data output bit 5 |
| Chân 22 | D6-/D6 — LVDS data output bit 6 |
| Chân 23 | D7-/D7 — LVDS data output bit 7 |
| Chân 24 | D8-/D8 — LVDS data output bit 8 |
| Chân 25 | D9-/D9 — LVDS data output bit 9 (LSB) |
| Chân 26 | NC — Not connected (per datasheet) |
| Chân 27 | OVDD — Output driver supply |
| Chân 28 | GND — Digital ground |
| Chân 29 | NC — Not connected (per datasheet) |
| Chân 30 | NC — Not connected (per datasheet) |
| Chân 31 | NC — Not connected (per datasheet) |
| Chân 32 | GND — Digital ground |
| Chân 33 | NC — Not connected (per datasheet) |
| Chân 34 | NC — Not connected (per datasheet) |
| Chân 35 | OVDD — Output driver supply |
| Chân 36 | NC — Not connected (per datasheet) |
| Chân 37 | GND — Digital ground |
| Chân 38 | OVDD — Output driver supply |
| Chân 39 | NC — Not connected (per datasheet) |
| Chân 40 | DOR- — LVDS data out-of-range / overflow |
| Chân 41 | DOR+ — LVDS data out-of-range complement |
| Chân 42 | NC — Not connected (per datasheet) |
| Chân 43 | GND — Digital ground |
| Chân 44 | NC — Not connected (per datasheet) |
| Chân 45 | OVDD — Output driver supply |
| Chân 46 | NC — Not connected (per datasheet) |
| Chân 47 | NC — Not connected (per datasheet) |
| Chân 48 | GND — Digital ground |
| Chân 49 | NC — Not connected (per datasheet) |
| Chân 50 | NC — Not connected (per datasheet) |
| Chân 51 | OVDD — Output driver supply |
| Chân 52 | NC — Not connected (per datasheet) |
| Chân 53 | GND — Digital ground |
| Chân 54 | NC — Not connected (per datasheet) |
| Chân 55 | NC — Not connected (per datasheet) |
| Chân 56 | OVDD — Output driver supply |
| Chân 57 | AVDD — Analog 2.5V supply |
| Chân 58 | AVDD — Analog 2.5V supply |
| Chân 59 | GND — Analog ground |
| Chân 60 | GND — Analog ground |
| Chân 61 | VCM — Common-mode voltage output |
| Chân 62 | VREF — Voltage reference decoupling |
| Chân 63 | AVDD — Analog 2.5V supply |
| Chân 64 | AVDD — Analog 2.5V supply |
Ứng dụng tiêu biểu
LTC2242CUP-10 phù hợp cho 6 Áp dụngs: Cellular Basestation Receiver, Cable Modem Head-End / CMTS, Radar / Lidar Digitizer Front-End, Test & Measurement Instrumentation, Medical Ultrasound Imaging, Software Defined Radio (SDR) Platforms.
Cellular Basestation Receiver
The LTC2242CUP-10 is purpose-built for cellular basestation IF digitization, where it directly samples wideband intermediate-frequency signals without an analog downconversion stage. Its 1.2 GHz full-power input bandwidth and 95 fsRMS aperture jitter preserve signal-to-noise ratio for multi-carrier 4G/5G waveforms, while the 78 dB SFDR ensures spurious intermodulation products stay below the noise floor of adjacent channels. The 250 Msps sample rate accommodates 100 MHz+ of instantaneous bandwidth, and the LVDS output interface streams 10-bit data directly into an FPGA digital front-end (DFE) for channelization, decimation, and crest-factor reduction. Power dissipation of 740 mW at full rate is manageable in a forced-air cooled basestation chassis.
Được đề xuất
Cable Modem Head-End / CMTS
In cable modem termination systems (CMTS), the LTC2242CUP-10 digitizes the upstream 5-85 MHz band at high oversampling ratios, allowing digital channel bonding and DOCSIS 3.1 upstream OFDMA demodulation. The pipelined 250 Msps architecture with 10-bit resolution oversamples the upstream band by a factor of 3-5x, giving the FPGA receiver significant processing gain against ingress noise and impulse disturbances common in HFC plants. The CMOS output mode is preferred here to reduce FPGA pin count and BOM cost versus LVDS. The exposed-pad QFN-64 package is footprint-compatible with the broader LTC22xx family, enabling a common PCB for downstream (lower-rate) and upstream (higher-rate) paths.
Được đề xuất
Radar / Lidar Digitizer Front-End
The LTC2242CUP-10 is well suited to IF-digitization of radar and lidar receivers, where its 1.2 GHz analog input bandwidth and 78 dB SFDR enable direct sampling of pulsed-Doppler intermediate frequencies in the 100-500 MHz range. The 95 fsRMS aperture jitter preserves the time-domain accuracy of short-pulse returns critical for range resolution, while the wide bandwidth avoids aliasing of chirp-FM or spread-spectrum waveforms. For automotive and industrial lidar, the commercial temperature grade (0-70 C) is acceptable for in-cabin or controlled-enclosure installations; outdoor or under-hood automotive applications should use the LTC2242IUP-10 industrial variant. The exposed pad provides adequate thermal dissipation for continuous full-rate operation.
Được đề xuất
Test & Measurement Instrumentation
In wideband digital oscilloscopes, spectrum analyzers, and arbitrary waveform generator capture paths, the LTC2242CUP-10 provides a cost-effective 250 Msps digitizer for 100 MHz-class analog front-ends. The 10-bit dynamic range suits general-purpose bench instruments where 8-bit ENOB is acceptable, and the LVDS output mode simplifies routing to high-pin-count FPGAs implementing trigger logic and on-screen measurement DSP. The 1.2 GHz input bandwidth supports undersampling of microwave carriers for frequency-extension measurements, and the exposed-pad QFN package enables compact multi-channel card stacks. Commercial temperature grade is sufficient for lab/bench environments.
Được đề xuất
Medical Ultrasound Imaging
The LTC2242CUP-10 fits the front-end of portable and mid-range diagnostic ultrasound systems, where 64-256 channel beamformer arrays demand a compact, low-power per-channel ADC. The 250 Msps rate supports 50-100 MHz RF signal capture after the TGC amplifier, and 78 dB SFDR preserves harmonic image fidelity critical for B-mode and Doppler color flow imaging. The 740 mW per channel dissipation is manageable with forced-air chassis cooling. For premium cart-based systems requiring 12-14 bit dynamic range, upgrade to LTC2155CUP-12 or LTC2145CUP-12 in the same QFN-64 family footprint. Commercial temperature grade suits in-hospital deployment; industrial grade is recommended for ambulance/mobile use.
Được đề xuất
Software Defined Radio (SDR) Platforms
Wideband SDR platforms leverage the LTC2242CUP-10's 1.2 GHz input bandwidth and 95 fsRMS jitter to directly digitize HF/VHF/UHF signals without analog mixers, simplifying receiver architecture. The 78 dB SFDR enables simultaneous capture of multiple narrowband signals with minimal intermodulation distortion - critical for spectrum sensing and cognitive radio. The LVDS output mode streams 10-bit samples into an FPGA implementing digital downconversion, channelization, and demodulation. The exposed-pad QFN-64 package fits compact embedded SDR modules, and the commercial temperature grade suits indoor and laboratory SDR deployments. Power dissipation of 740 mW is competitive in battery-powered portable SDRs.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho LTC2242CUP-10 — 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 | LTC2242IUP-10 | LTC2241CUP-10 | LTC2240CUP-10 | LTC2241IUP-12 |
|---|---|---|---|---|---|
| Package | 64-QFN (9x9 mm) | 64-QFN (9x9 mm) - same | 64-QFN (9x9 mm) - same | 64-QFN (9x9 mm) - same | 64-QFN (9x9 mm) - same |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 10 bit | 10 bit | 10 bit | 10 bit | 12 bit |
| Sample Rate (max) | 250 Msps | 250 Msps | 200 Msps | 150 Msps | 200 Msps |
| SNR | 60.5 dB | 60.5 dB | 61 dB (typical) | 61.5 dB (typical) | 65.5 dB (12-bit) |
| SFDR | 78 dB | 78 dB | 78 dB | 78 dB | 78 dB |
| Operating Temperature | 0 C to +70 C (Commercial) | -40 C to +85 C (Industrial) | 0 C to +70 C (Commercial) | 0 C to +70 C (Commercial) | -40 C to +85 C (Industrial) |
Bảo phân biệt quan trọng
- Higher sample rate than the LTC2241CUP-10 (vsLTC2241CUP-10)
- Same QFN-64 footprint as the LTC2241IUP-12 for vertical resolution upgrade (vsLTC2241IUP-12)
- Industrial temperature variant available for harsh environments (vsLTC2242IUP-10)
Ghi chú thiết kế
Decouple AVDD (2.5V analog supply) with a 10 uF tantalum in parallel with 0.1 uF ceramic placed within 5 mm of each AVDD pin. OVDD (1.5-3.3V output supply) should be decoupled with 4.7 uF + 0.1 uF ceramic. Keep the AVDD and OVDD planes physically separated to prevent digital switching noise from coupling into the analog domain; use a ferrite bead between AVDD and OVDD if they share an upstream regulator. Estimated: a 4-layer FR-4 board with 1 oz copper dissipates 740 mW with approximately 25 C junction rise above ambient when the exposed pad is soldered to a 1 square inch copper pour.
Route the differential analog inputs (INA+, INA-) as a 100-ohm differential pair from the output of the front-end driver (e.g., a transformer or differential op-amp). Match lengths within 0.5 mm to preserve common-mode rejection. The CLK+ and CLK- lines are also differential; route them as a 100-ohm pair with length matching within 1 mm of each other and isolated from the analog inputs by at least 3x the dielectric thickness to minimize clock feedthrough. The exposed thermal pad must be soldered to a continuous ground copper pour with thermal vias (9 vias in a 3x3 array recommended) for heat extraction.
Do not leave unused LVDS/CMOS output pins floating - per the LTC2242-10 datasheet (document 224210f), all unused outputs should be tied to OVDD through 10 kohm resistors to prevent spurious switching. The SENSE pin selects internal vs external reference mode; tie SENSE to AVDD for internal reference (recommended for most applications) or to ground for external reference drive. Avoid driving CLK with a single-ended signal - the LTC2242CUP-10 requires a true differential clock (transformer-coupled PECL/LVDS) for rated jitter performance. Single-ended clocking will degrade SNR by 3-5 dB at high IF input frequencies.
Thông tin tuân thủ
RoHS compliance is denoted by the #PBF suffix on the orderable part number. Per Analog Devices product page, the LTC2242-10 family is RoHS compliant. AEC-Q100 is not applicable - this is a commercial-grade ADC intended for industrial, communications, and test equipment. For automotive-qualified ADCs, see the AD925x family.
