LTC2155CUP-12 - Dual 12-Bit 170Msps ADC | Analog Devices
MPN: LTC2155CUP-12 ✓ Hoạt độngLTC2155CUP-12 Tóm tắt
What is a pipelined ADC? A pipelined analog-to-digital converter is a high-speed ADC architecture that breaks the conversion into multiple low-resolution stages, each handling one sample per clock cycle. This pipeline approach enables high sampling rates (hundreds of Msps) while maintaining moderate resolution (10-16 bits), making pipelined ADCs the standard for communications, radar, and instrumentation applications. The LTC2155 belongs to the dual-pipelined ADC category, integrating two matched ADC channels on a single die for I/Q baseband or diversity reception.
Key features of the LTC2155CUP-12 include a 1.25 GHz full-power bandwidth sample-and-hold, an optional clock duty cycle stabilizer, low-power sleep and nap modes, and a serial SPI port for configuration. The pin-compatible 14-bit versions (LTC2157-14/LTC2156-14/LTC2155-14) allow easy migration when higher dynamic range is needed. The differential inputs are easy to drive, simplifying front-end design for direct-IF sampling receivers.
The architecture uses a high-speed pipelined core with on-chip reference and sample-and-hold, achieving excellent linearity and low jitter. DDR LVDS outputs simplify data capture by providing one data pair per channel per clock edge, reducing the number of data lines routed on the PCB. The internal duty cycle stabilizer compensates for clock source imperfections, preserving SNR at high input frequencies.
Typical applications include communications receivers, cellular base stations, radar and LiDAR signal chains, portable instrumentation, medical imaging front-ends, and software-defined radio (SDR) platforms. The combination of dual channels, low power, and small QFN-64 footprint makes the LTC2155CUP-12 particularly suited to multi-channel compact systems.
When designing with this ADC, pay close attention to the analog input network: a differential transformer or driver amplifier must present 1.5 V peak-to-peak to maximize SNR. Use low-jitter clock sources and matched-length differential output pairs to preserve LVDS timing margins at 170 Msps.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
Bộ thay thế dễ dàng lắp đặt cho LTC2155CUP-12 — 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 LTC2155CUP-12 (cùng hình factor và footprint) — khác nhau ở Package, SNR, RoHS Status, Sampling Rate, Operating Temperature Range.
LTC2155IUP-12#PBF
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
LTC2156CUP-12#PBF
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
LTC2157CUP-12#PBF
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
LTC2155CUP-12#TRPBF
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
LTC2145CUP-12
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →LTC2155CUP-12 Tỷ lệ tối đa & tính chất điện
| Độ phân giải | 12 bits |
| Number of Channels | 2 (dual) |
| Tỷ lệ lấy mẫu | 170 Msps |
| Architecture | Pipelined |
| SNR | 68.5 dB |
| SFDR | 90 dB |
| Điện áp cung cấp | 1.8 V (single) |
| Power Consumption | 545 mW |
| Input Type | Differential |
| Input Range | 1.5 V peak-to-peak |
| Full-Power Bandwidth | 1.25 GHz |
| Output Interface | DDR LVDS |
| Hộp | QFN-64 (UP) 9 mm × 9 mm |
| Configuration Interface | Serial SPI |
| Khoảng nhiệt độ hoạt động | Commercial (0C to +70C) |
Cấu hình chân LTC2155CUP-12
| Chân 1 | AIN1+ — Channel 1 positive differential analog input |
| Chân 2 | AIN1- — Channel 1 negative differential analog input |
| Chân 3 | VCM1 — Channel 1 common-mode voltage output |
| Chân 4 | GND — Ground |
| Chân 5 | AIN2+ — Channel 2 positive differential analog input |
| Chân 6 | AIN2- — Channel 2 negative differential analog input |
| Chân 7 | VCM2 — Channel 2 common-mode voltage output |
| Chân 8 | GND — Ground |
| Chân 9 | AVDD1.8 — 1.8V analog supply |
| Chân 10 | AVDD1.8 — 1.8V analog supply |
| Chân 11 | GND — Ground |
| Chân 12 | REF — Internal reference decoupling |
| Chân 13 | REFT — Differential reference top |
| Chân 14 | REFB — Differential reference bottom |
| Chân 15 | GND — Ground |
| Chân 16 | AVDD1.8 — 1.8V analog supply |
| Chân 17 | GND — Ground |
| Chân 18 | AVDD1.8 — 1.8V analog supply |
| Chân 19 | GND — Ground |
| Chân 20 | CLK+ — Clock input positive |
| Chân 21 | CLK- — Clock input negative |
| Chân 22 | GND — Ground |
| Chân 23 | CS — SPI chip select |
| Chân 24 | SCK — SPI serial clock |
| Chân 25 | SDI — SPI serial data input |
| Chân 26 | SDO — SPI serial data output |
| Chân 27 | OVDD — LVDS output supply |
| Chân 28 | OGND — LVDS output ground |
| Chân 29 | NC — Not connected |
| Chân 30 | OUT1A+ — Channel 1 LVDS output A positive |
| Chân 31 | OUT1A- — Channel 1 LVDS output A negative |
| Chân 32 | OUT1B+ — Channel 1 LVDS output B positive |
| Chân 33 | OUT1B- — Channel 1 LVDS output B negative |
| Chân 34 | OVDD — LVDS output supply |
| Chân 35 | OGND — LVDS output ground |
| Chân 36 | OUTCLK+ — LVDS output clock positive |
| Chân 37 | OUTCLK- — LVDS output clock negative |
| Chân 38 | OUTFR+ — LVDS frame output positive |
| Chân 39 | OUTFR- — LVDS frame output negative |
| Chân 40 | OGND — LVDS output ground |
| Chân 41 | OVDD — LVDS output supply |
| Chân 42 | OUT2A+ — Channel 2 LVDS output A positive |
| Chân 43 | OUT2A- — Channel 2 LVDS output A negative |
| Chân 44 | OUT2B+ — Channel 2 LVDS output B positive |
| Chân 45 | OUT2B- — Channel 2 LVDS output B negative |
| Chân 46 | OVDD — LVDS output supply |
| Chân 47 | OGND — LVDS output ground |
| Chân 48 | MODE — Mode select pin |
| Chân 49 | NAP — Nap mode pin |
| Chân 50 | SLEEP — Sleep mode pin |
| Chân 51 | RST — Reset pin |
| Chân 52 | GND — Ground |
| Chân 53 | AVDD1.8 — 1.8V analog supply |
| Chân 54 | GND — Ground |
| Chân 55 | AVDD1.8 — 1.8V analog supply |
| Chân 56 | GND — Ground |
| Chân 57 | AVDD1.8 — 1.8V analog supply |
| Chân 58 | GND — Ground |
| Chân 59 | AVDD1.8 — 1.8V analog supply |
| Chân 60 | AVDD1.8 — 1.8V analog supply |
| Chân 61 | GND — Ground |
| Chân 62 | DCS — Duty cycle stabilizer enable |
| Chân 63 | OVDD — LVDS output supply |
| Chân 64 | OGND — LVDS output ground |
Ứng dụng tiêu biểu
LTC2155CUP-12 phù hợp cho 6 Áp dụngs: Cellular Base Station Receiver, Radar and LiDAR Signal Chains, Portable Test and Measurement Instrumentation, Software Defined Radio (SDR) Platforms, Medical Imaging Front-Ends, Industrial Process Control and Data Acquisition.
Cellular Base Station Receiver
The LTC2155CUP-12's dual 12-bit 170 Msps channels and 68.5 dB SNR suit multi-carrier cellular base-station digitizers where two diversity antennas feed a single ADC. The 1.5 V peak-to-peak differential input range simplifies coupling from a passive IF transformer without a front-end amplifier, while DDR LVDS outputs ease timing closure into a baseband FPGA or ASIC. At 545 mW total, the part enables compact, multi-channel receivers in macro and small-cell BTS designs.
Được đề xuất
Radar and LiDAR Signal Chains
Wide dynamic range demands in radar and LiDAR front-ends map directly to the LTC2155CUP-12's 90 dB SFDR and 1.25 GHz full-power bandwidth. The dual channels digitize I/Q baseband returns simultaneously with matched latency, preserving phase coherence for Doppler and FMCW processing. Low power (545 mW) and a 9×9 mm QFN footprint allow dense multi-channel arrays in phased-array radar modules.
Được đề xuất
Portable Test and Measurement Instrumentation
Portable oscilloscopes and spectrum analyzers benefit from the LTC2155CUP-12's 170 Msps dual channels, low 545 mW power, and small QFN-64 footprint. Battery-powered instruments can digitize two channels simultaneously while preserving SNR at high input frequencies via the 1.25 GHz analog bandwidth. The integrated SPI port simplifies per-channel gain and offset calibration in production test fixtures.
Được đề xuất
Software Defined Radio (SDR) Platforms
SDR platforms demand flexible, dual-channel ADCs with low noise and moderate sample rates - exactly the LTC2155CUP-12's 68.5 dB SNR / 90 dB SFDR / 170 Msps profile. The single 1.8 V supply simplifies power design on USB-powered dongles and embedded SDR boards, while DDR LVDS outputs stream data into FPGAs (e.g., Xilinx Artix, Lattice ECP5) used for DSP. The dual channels capture I/Q baseband directly from quadrature demodulators.
Được đề xuất
Medical Imaging Front-Ends
Ultrasound and other medical imaging systems use multi-channel ADC arrays for beamforming. The LTC2155CUP-12's dual matched channels fit dense channel layouts, while 68.5 dB SNR preserves dynamic range required for tissue contrast. Low power (545 mW) keeps per-channel thermal load manageable in handheld or cart-based systems where patient safety and battery life are priorities.
Được đề xuất
Industrial Process Control and Data Acquisition
Multi-axis industrial controllers and high-speed data acquisition cards use the LTC2155CUP-12 to digitize vibration, position, and control-loop feedback. The dual channels allow simultaneous sampling of paired sensors (e.g., current and voltage, or X-Y axis position) with matched latency. Industrial LVDS runs reliably in electrically noisy factory environments, while the SPI port allows per-channel configuration during operation.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho LTC2155CUP-12 — 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 | LTC2155IUP-12#PBF | LTC2156CUP-12#PBF | LTC2157CUP-12#PBF | LTC2145CUP-12 |
|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | QFN-64 (UP) 9x9 mm | QFN-64 (UP) 9x9 mm - same | QFN-64 (UP) 9x9 mm - same | QFN-64 (UP) 9x9 mm - same | QFN-64 (UP) 9x9 mm - same |
| Resolution | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits |
| Sampling Rate | 170 Msps | 170 Msps | 210 Msps | 250 Msps | 125 Msps |
| Number of Channels | 2 (dual) | 2 (dual) | 2 (dual) | 2 (dual) | 2 (dual) |
| Power Consumption | 545 mW | 545 mW | 592 mW | 628 mW | 420 mW |
| SNR | 68.5 dB | 68.5 dB | 67.5 dB | 65.5 dB | 70 dB |
| Operating Temperature | 0C to +70C (commercial) | -40C to +85C (industrial) | 0C to +70C (commercial) | 0C to +70C (commercial) | 0C to +70C (commercial) |
Bảo phân biệt quan trọng
- Lowest power in the LTC2157/LTC2156/LTC2155 12-bit family (vsLTC2157CUP-12#PBF)
- Industrial temperature grade alternative available in same package (vsLTC2155IUP-12#PBF)
- Higher SNR than faster family members due to lower speed grade (vsLTC2157CUP-12#PBF)
- Higher sampling than slower LTC2145 family for wideband use (vsLTC2145CUP-12)
Ghi chú thiết kế
Use a solid ground plane on layer 2 with the QFN-64 exposed pad soldered to a continuous copper pour that connects to the analog ground. Keep analog input traces impedance-controlled at 100 ohm differential, route them as short as possible, and avoid crossing any digital LVDS lines. Place 0.1uF ceramic bypass capacitors within 2 mm of every AVDD1.8 pin and a 10uF bulk capacitor near the reference pin.
Drive the LTC2155CUP-12 CLK+/CLK- input with a low-jitter, differential clock source (typical 50% duty cycle, <300fs RMS jitter) to preserve SNR at high input frequencies. Enable the on-chip duty cycle stabilizer (DCS pin high) when the external clock duty cycle deviates from 50%, which compensates for duty-cycle distortion and prevents SNR degradation at high input frequencies approaching Nyquist.
Use a linear LDO (such as LT3042 or LT3080) to derive the 1.8V AVDD supply from a 3.3V rail to avoid switching noise coupling into the analog input. Add a ferrite bead and additional 10uF + 0.1uF decoupling between the LDO and the AVDD pin. Separate the OVDD (LVDS supply) plane from the AVDD plane and stitch with a single-point bridge to prevent digital switching noise from corrupting the analog reference.
Route the four LVDS data pairs (OUT1A, OUT1B, OUT2A, OUT2B), the LVDS output clock (OUTCLK), and the LVDS frame (OUTFR) as 100 ohm differential traces with matched lengths (within 1 ps skew, or approximately 150 um). Maintain continuous ground beneath each LVDS pair, avoid 90 degree bends, and use controlled impedance stack-up. Series-terminate each LVDS output near the ADC with 100 ohm differential impedance to prevent reflections.
Thông tin tuân thủ
RoHS compliant per ADI product page ordering suffix #PBF. AEC-Q100 not qualified - choose automotive-grade LTC2155AUP or industrial LTC2155IUP-12 variants for harsher environments. Halogen-free status not stated in the verified datasheet snippet - confirm with ADI customer support for halogen-free specific orders.
