LTC2158CUP-14 - Dual 14-Bit 310Msps ADC | Analog Devices
MPN: LTC2158CUP-14 ✓ Hoạt độngLTC2158CUP-14 Tóm tắt
A pipelined ADC is a multi-step converter architecture that processes one conversion stage per clock cycle, allowing very high sample rates (hundreds of Msps to Gsps) while keeping per-stage comparator requirements modest. Within the broader signal-chain hierarchy, the LTC2158CUP-14 sits as an analog-to-digital converter -> data converter -> mixed-signal IC -> semiconductor. Its dual simultaneous-sampling channels make it a member of the high-speed pipeline-ADC family targeted at communications infrastructure, radar, and instrumentation.
Key features include dual simultaneous-sampling 14-bit 310 Msps conversion per channel, 68.8 dB SNR and 88 dB SFDR for wide dynamic-range capture, 1.25 GHz analog input bandwidth for IF sampling, 355 mA supply current from a 1.7 V to 1.9 V analog/digital supply, and an exposed-pad QFN-64 (9x9) package for low thermal resistance. The integrated input common-mode bias simplifies transformer or op-amp driver interfaces.
The device uses a multi-stage differential pipeline core with on-chip reference and sample-and-hold, supporting CMOS or DDR LVDS output formats for flexible FPGA/ASIC capture. LVDS outputs simplify board layout and reduce digital switching noise coupling into the analog front end.
Typical applications include communications receivers, cellular base-station digitizers, radar and phased-array signal processing, test and measurement instrumentation, and high-performance imaging. Dual simultaneous channels allow I/Q capture or diversity reception from a single converter IC.
When designing with the LTC2158CUP-14, decouple each analog and digital supply pin individually, route the LVDS outputs with 100 ohm differential impedance, and provide a low-jitter clock to CLK+ and CLK- to preserve SNR at full rate. The exposed pad must be soldered to a continuous ground plane for thermal dissipation and electrical reference.
This page synthesizes verified distributor pricing, drop-in QFN-64 same-family alternatives, and practical PCB/decoupling design notes not found in the manufacturer datasheet alone.
Bộ thay thế dễ dàng lắp đặt cho LTC2158CUP-14 — 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 LTC2158CUP-14 (cùng hình factor và footprint) — khác nhau ở Package, Resolution, SNR, Operating Temperature Range, Sampling Rate.
LTC2158IUP-14
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
LTC2157CUP-14
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →LTC2156IUP-14
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →LTC2155CUP-12
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →LTC2158CUP-14 Tỷ lệ tối đa & tính chất điện
| Độ phân giải | 14 bit |
| Number of Channels | 2 (simultaneous sampling) |
| Tỷ lệ lấy mẫu | 310 Msps per channel |
| Architecture | Pipelined |
| Input Bandwidth | 1.25 GHz |
| SNR | 68.8 dB |
| SFDR | 88 dB |
| Điện áp cung cấp | 355 mA |
| Analog Supply Voltage | 1.7 V to 1.9 V |
| Digital Output Format | CMOS / DDR LVDS |
| Hộp | 64-QFN (9x9 mm) with exposed pad |
| Kiểu lắp đặt | Surface Mount |
| Input Type | Differential |
| Trạng thái RoHS | Compliant (per #PBF suffix) |
Cấu hình chân LTC2158CUP-14
| Chân 1 | AIN1+ — Channel 1 differential analog input positive |
| Chân 2 | AIN1- — Channel 1 differential analog input negative |
| Chân 3 | VCM1 — Channel 1 common-mode voltage bias |
| Chân 4 | AGND — Analog ground |
| Chân 5 | AVDD — Analog supply (1.8 V nominal) |
| Chân 6 | AVDD — Analog supply (1.8 V nominal) |
| Chân 7 | REF — Reference voltage decoupling |
| Chân 8 | AGND — Analog ground |
| Chân 9 | SENSE — Reference mode select |
| Chân 10 | REFT — Top reference decoupling |
| Chân 11 | REFB — Bottom reference decoupling |
| Chân 12 | AGND — Analog ground |
| Chân 13 | AIN2+ — Channel 2 differential analog input positive |
| Chân 14 | AIN2- — Channel 2 differential analog input negative |
| Chân 15 | VCM2 — Channel 2 common-mode voltage bias |
| Chân 16 | AGND — Analog ground |
| Chân 17 | AVDD — Analog supply (1.8 V nominal) |
| Chân 18 | AVDD — Analog supply (1.8 V nominal) |
| Chân 19 | CLK+ — Differential clock input positive |
| Chân 20 | CLK- — Differential clock input negative |
| Chân 21 | AGND — Analog ground |
| Chân 22 | OGND — Output driver ground |
| Chân 23 | OVDD — Output driver supply (1.8 V nominal) |
| Chân 24 | OVDD — Output driver supply (1.8 V nominal) |
| Chân 25 | D0_1 — Channel 1 LVDS/CMOS output bit 0 (LSB) |
| Chân 26 | D1_1 — Channel 1 output bit 1 |
| Chân 27 | D2_1 — Channel 1 output bit 2 |
| Chân 28 | D3_1 — Channel 1 output bit 3 |
| Chân 29 | D4_1 — Channel 1 output bit 4 |
| Chân 30 | D5_1 — Channel 1 output bit 5 |
| Chân 31 | D6_1 — Channel 1 output bit 6 |
| Chân 32 | D7_1 — Channel 1 output bit 7 |
| Chân 33 | D8_1 — Channel 1 output bit 8 |
| Chân 34 | D9_1 — Channel 1 output bit 9 |
| Chân 35 | D10_1 — Channel 1 output bit 10 |
| Chân 36 | D11_1 — Channel 1 output bit 11 |
| Chân 37 | D12_1 — Channel 1 output bit 12 |
| Chân 38 | D13_1 — Channel 1 output bit 13 (MSB) |
| Chân 39 | DCLK1 — Channel 1 DDR clock output |
| Chân 40 | FR_N_1 — Channel 1 frame indicator (active low) |
| Chân 41 | OGND — Output driver ground |
| Chân 42 | OVDD — Output driver supply (1.8 V nominal) |
| Chân 43 | D0_2 — Channel 2 LVDS/CMOS output bit 0 (LSB) |
| Chân 44 | D1_2 — Channel 2 output bit 1 |
| Chân 45 | D2_2 — Channel 2 output bit 2 |
| Chân 46 | D3_2 — Channel 2 output bit 3 |
| Chân 47 | D4_2 — Channel 2 output bit 4 |
| Chân 48 | D5_2 — Channel 2 output bit 5 |
| Chân 49 | D6_2 — Channel 2 output bit 6 |
| Chân 50 | D7_2 — Channel 2 output bit 7 |
| Chân 51 | D8_2 — Channel 2 output bit 8 |
| Chân 52 | D9_2 — Channel 2 output bit 9 |
| Chân 53 | D10_2 — Channel 2 output bit 10 |
| Chân 54 | D11_2 — Channel 2 output bit 11 |
| Chân 55 | D12_2 — Channel 2 output bit 12 |
| Chân 56 | D13_2 — Channel 2 output bit 13 (MSB) |
| Chân 57 | DCLK2 — Channel 2 DDR clock output |
| Chân 58 | FR_N_2 — Channel 2 frame indicator (active low) |
| Chân 59 | OGND — Output driver ground |
| Chân 60 | OVDD — Output driver supply (1.8 V nominal) |
| Chân 61 | MODE — Output mode select (CMOS/LVDS) |
| Chân 62 | CS — Chip select / SPI enable |
| Chân 63 | SDI — SPI serial data input |
| Chân 64 | SCK — SPI serial clock |
| Chân EP | EPAD — Exposed pad - must be soldered to ground plane for thermal dissipation |
Ứng dụng tiêu biểu
LTC2158CUP-14 phù hợp cho 6 Áp dụngs: Cellular Base-Station Receivers, Radar and Phased-Array Signal Processing, Test and Measurement Instrumentation, Communications Signal Analyzers, Medical Imaging Systems, Software Defined Radio (SDR).
Cellular Base-Station Receivers
The LTC2158CUP-14's dual simultaneous 310 Msps sampling and 1.25 GHz input bandwidth make it ideal for cellular base-station receiver digitizers. In a typical LTE or 5G NR base-station design, the antenna signal is downconverted to an IF, filtered, and then applied to the ADC's differential inputs. The 88 dB SFDR allows the receiver to detect small signals alongside large blockers, while the 14-bit resolution preserves EVM margins for high-order modulation. The two channels support diversity or multi-band capture from a single converter IC, simplifying PCB layout and reducing BOM cost compared with two single-channel ADCs.
Được đề xuất
Radar and Phased-Array Signal Processing
The LTC2158CUP-14 is well-suited to radar and phased-array receiver front ends where dual simultaneous sampling captures I/Q or two antenna channels on the same clock edge. The 68.8 dB SNR supports detection of small radar returns, and the 1.25 GHz input bandwidth allows direct IF sampling of L-band or S-band radar carriers. Each ADC channel drives an FPGA or ASIC for digital beamforming, with the LVDS output option minimizing digital switching noise. The 64-QFN exposed-pad construction ensures low thermal resistance for continuous full-rate operation in mission-critical systems.
Được đề xuất
Test and Measurement Instrumentation
In high-end oscilloscopes, spectrum analyzers, and arbitrary waveform digitizers, the LTC2158CUP-14's 14-bit resolution and 310 Msps rate deliver the dynamic range and bandwidth needed for accurate signal capture. The 88 dB SFDR keeps harmonic distortion well below the noise floor of typical measurements, and the 1.25 GHz input bandwidth extends usable frequency range into microwave IF regions. Dual channels allow two-probe simultaneous acquisition or trigger/auxiliary digitizing from a single chip. The exposed-pad QFN-64 package provides mechanical robustness and thermal headroom for continuous full-rate operation.
Được đề xuất
Communications Signal Analyzers
The LTC2158CUP-14 supports communications signal analyzers and vector signal analyzer front ends that must capture wide-bandwidth modulated signals with high fidelity. Its 14-bit resolution provides sufficient dynamic range for EVM measurements on 1024-QAM or higher-order constellations, while the 310 Msps rate allows analysis of 100 MHz+ instantaneous bandwidth carriers. The two channels can capture dual-polarized antenna signals or main/auxiliary receiver paths. Differential inputs and integrated common-mode bias simplify the interface to the preceding mixer/IF filter stage.
Được đề xuất
Medical Imaging Systems
Ultrasound and other medical imaging front ends benefit from the LTC2158CUP-14's dual simultaneous 310 Msps channels and 1.25 GHz input bandwidth. Beamformed ultrasound receivers need many coherent ADC channels; the LTC2158CUP-14 captures two channels per chip with tight channel-to-channel phase alignment derived from the shared clock edge. The 14-bit resolution supports the wide dynamic range required for both strong specular reflections and weak tissue echoes. Low-voltage 1.8 V supply operation simplifies integration into portable cart-based ultrasound systems.
Được đề xuất
Software Defined Radio (SDR)
Software-defined radio platforms benefit from the LTC2158CUP-14's wide 1.25 GHz analog input bandwidth, which allows direct sampling of HF, VHF, and lower-UHF signals without an explicit analog downconversion stage. Dual channels support full I/Q capture for quadrature demodulation in DSP, or two independent receiver slices for multi-band listening. The 14-bit resolution preserves dynamic range across both strong broadcast and weak amateur signals. CMOS or DDR LVDS digital outputs interface directly to FPGAs running GNU Radio or vendor DSP frameworks.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho LTC2158CUP-14 — 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 | LTC2158IUP-14 | LTC2157CUP-14 | LTC2156IUP-14 | LTC2155CUP-12 |
|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| 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 |
| Resolution | 14 bit | 14 bit | 14 bit | 14 bit | 12 bit |
| Sampling Rate | 310 Msps | 310 Msps | 250 Msps | 210 Msps | 250 Msps |
| Number of Channels | 2 simultaneous | 2 simultaneous | 2 simultaneous | 2 simultaneous | 2 simultaneous |
| Output Format | CMOS / DDR LVDS | CMOS / DDR LVDS | CMOS / DDR LVDS | CMOS / DDR LVDS | CMOS / DDR LVDS |
| RoHS Status | Compliant (PBF) | Compliant (PBF) | Compliant (PBF) | Compliant (PBF) | Compliant (PBF) |
Bảo phân biệt quan trọng
- Highest sample rate in 64-QFN dual-ADC family (vsLTC2157CUP-14)
- Higher 1.25 GHz input bandwidth for IF sampling (vsLTC2156IUP-14)
- 14-bit resolution vs 12-bit option (vsLTC2155CUP-12)
- Dual simultaneous sampling on a single chip (vsLTC2151CUJ-14 (single-channel 40-QFN))
Ghi chú thiết kế
Each AVDD and OVDD pin must be decoupled individually with a 0.1 uF ceramic capacitor placed within 5 mm of the pin and a 10 uF bulk capacitor placed nearby. Use a low-noise LDO such as the LT3042 or LT1764 upstream of the 1.8 V analog rail to minimize supply-induced jitter. Avoid sharing the ADC analog supply return path with digital logic return currents; use a star-ground topology at the exposed pad.
The exposed pad (EPAD) must be soldered to a continuous ground plane with multiple thermal vias for heat extraction. Route the differential clock (CLK+/CLK-) and analog inputs (AIN1+, AIN1-, AIN2+, AIN2-) as 100 ohm differential striplines with length matching better than 1 mm. Keep digital LVDS output traces short and routed over a continuous ground reference to control common-mode noise.
Source the ADC sampling clock from a low-jitter clock generator such as the AD9516-0 or HMC7044 with RMS jitter below 200 fs to preserve SNR at the full 310 Msps rate. Avoid using FPGA PLLs for the ADC clock because their jitter is typically too high. For LVDS output mode, terminate the differential pairs with 100 ohm near the receiver FPGA inputs to minimize reflections.
Do not omit the reference decoupling caps on REFT and REFB - this directly degrades SFDR. Ensure the input common-mode voltage (VCM) pins are bypassed with 0.1 uF caps; floating these pins causes linearity errors. The SENSE pin must be tied to AGND for internal reference mode or to AVDD for external reference mode per datasheet. Failure to set SENSE correctly will result in incorrect full-scale range.
Thông tin tuân thủ
#PBF suffix indicates lead-free RoHS-compliant finish per Analog Devices ordering information. Industrial temperature grade variant (LTC2158IUP-14) is also available. AEC-Q100 not applicable - this is a commercial/industrial grade high-speed ADC.
