LTC2180IUP - 16-Bit 25Msps Dual ADC | Analog Devices
MPN: LTC2180IUP ✓ Hoạt độngLTC2180IUP Tóm tắt
Background Knowledge: An ADC (Analog-to-Digital Converter) is a semiconductor device that converts continuous analog signals into discrete digital codes. Dual ADCs contain two independent converter channels that sample simultaneously, which is essential when the relative phase between two signals carries information (for example, I/Q baseband signals in a radio receiver, or paired sensor channels in sonar and vibration analysis). The LTC2180 family sits within the broader hierarchy: ADC -> data converter -> signal chain IC -> mixed-signal semiconductor.
Key features include 25 Msps sampling per channel, simultaneous sampling of both inputs, ultralow jitter of 0.07 ps RMS that enables IF undersampling, an internal common-mode reference buffer, and a flexible CMOS/LVDS digital output bus. The pipelined architecture delivers low latency while maintaining 16-bit resolution at full throughput. Total power dissipation is approximately 250 mW per channel at full rate.
Typical applications include diversity receivers and I/Q digitizers in software-defined radio, multi-channel ultrasound front ends, precision data acquisition, wideband spectrum analyzers, and medical imaging subsystems. The wide input bandwidth and excellent SFDR make it suitable for direct-IF sampling.
Design consideration: because both channels share a common clock and reference, layout must keep analog and digital grounds separated under the exposed pad. Aggressive LC filtering on the analog AVDD supply is critical to maintain SNR at high input frequencies.
This page synthesizes distributor pricing, drop-in same-package alternatives from the same LTC family, and practical design notes not consolidated in the manufacturer datasheet, providing decision-ready information for engineers selecting a 16-bit dual ADC for a multi-channel signal chain.
Bộ thay thế dễ dàng lắp đặt cho LTC2180IUP — 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 LTC2180IUP (cùng hình factor và footprint) — khác nhau ở Package, Operating Temperature Range, Input Type, SNR, Resolution.
LTC2180CUP
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →LTC2181IUP
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →LTC2182IUP
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →LTC2175IUKG-12
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →LTC2145CUP-12
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →LTC2156IUP-14
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →LTC2180IUP Tỷ lệ tối đa & tính chất điện
| Độ phân giải | 16 bits |
| Number of Channels | 2 (dual, simultaneous sampling) |
| Sampling Rate (per channel) | 25 Msps |
| Architecture | Pipelined |
| Input Type | Differential |
| SNR | 77 dB |
| SFDR | 90 dB |
| Aperture Jitter | 0.07 ps RMS |
| Supply Voltage (AVDD/DVDD) | 1.8 V typ |
| Digital Output | CMOS or LVDS selectable |
| Hộp | 64-QFN (9x9 mm) with exposed pad |
| Kiểu lắp đặt | Surface Mount |
| Khoảng nhiệt độ hoạt động | -40C to +85C (industrial, "I" suffix) |
| Trạng thái RoHS | Compliant |
Cấu hình chân LTC2180IUP
| Chân 1 | AIN1+ — Channel 1 analog input positive (differential) |
| Chân 2 | AIN1- — Channel 1 analog input negative (differential) |
| Chân 3 | GND — Analog ground reference |
| Chân 4 | AIN2+ — Channel 2 analog input positive (differential) |
| Chân 5 | AIN2- — Channel 2 analog input negative (differential) |
| Chân 6 | REFT — Reference top (output) |
| Chân 7 | REFM — Reference mid (output) |
| Chân 8 | REFB — Reference bottom (output) |
| Chân 9 | REFP — Reference positive (drive with external reference) |
| Chân 10 | REFN — Reference negative (drive with external reference) |
| Chân 11 | VCM — Common-mode voltage buffer output |
| Chân 12 | AVDD — Analog 1.8V supply |
| Chân 13 | AVDD — Analog 1.8V supply |
| Chân 14 | GND — Analog ground |
| Chân 15 | AVDD — Analog 1.8V supply |
| Chân 16 | GND — Analog ground |
| Chân 17 | ENC+ — Encode clock input positive |
| Chân 18 | ENC- — Encode clock input negative |
| Chân 19 | GND — Clock ground |
| Chân 20 | AVDD — Analog 1.8V supply |
| Chân 21 | GND — Analog ground |
| Chân 22 | NC — Not connected |
| Chân 23 | NC — Not connected |
| Chân 24 | DVDD — Digital 1.8V supply |
| Chân 25 | DVDD — Digital 1.8V supply |
| Chân 26 | GND — Digital ground |
| Chân 27 | OGND — Output driver ground (LVDS/CMOS) |
| Chân 28 | OVDD — Output driver supply |
| Chân 29 | MODE — Output mode / data format select |
| Chân 30 | CS — Chip select (SPI configuration) |
| Chân 31 | SCK — Serial clock (SPI configuration) |
| Chân 32 | SDI — Serial data input (SPI configuration) |
| Chân 33 | SDO — Serial data output (SPI configuration) |
| Chân 34 | DFMT — Data format select: 2's complement / offset binary |
| Chân 35 | LVDSCMOS — LVDS / CMOS output driver select |
| Chân 36 | CLKDIV — Clock divider select |
| Chân 37 | RAND — Data output randomizer enable |
| Chân 38 | OUT1A_P — Channel 1 LVDS data positive (or CMOS bit A) |
| Chân 39 | OUT1A_N — Channel 1 LVDS data negative (or CMOS bit /A) |
| Chân 40 | OUT1B_P — Channel 1 LVDS data positive (or CMOS bit B) |
| Chân 41 | OUT1B_N — Channel 1 LVDS data negative (or CMOS bit /B) |
| Chân 42 | DCO_P — Data clock output positive (LVDS) |
| Chân 43 | DCO_N — Data clock output negative (LVDS) |
| Chân 44 | FR_P — Frame output positive (LVDS) |
| Chân 45 | FR_N — Frame output negative (LVDS) |
| Chân 46 | OUT2A_P — Channel 2 LVDS data positive (or CMOS bit A) |
| Chân 47 | OUT2A_N — Channel 2 LVDS data negative (or CMOS bit /A) |
| Chân 48 | OUT2B_P — Channel 2 LVDS data positive (or CMOS bit B) |
| Chân 49 | OUT2B_N — Channel 2 LVDS data negative (or CMOS bit /B) |
| Chân 50 | GND — Digital ground |
| Chân 51 | DVDD — Digital 1.8V supply |
| Chân 52 | GND — Digital ground |
| Chân 53 | NC — Not connected |
| Chân 54 | NC — Not connected |
| Chân 55 | NC — Not connected |
| Chân 56 | NC — Not connected |
| Chân 57 | NC — Not connected |
| Chân 58 | NC — Not connected |
| Chân 59 | NC — Not connected |
| Chân 60 | NC — Not connected |
| Chân 61 | SENSE — Voltage sense pin (analog supply monitor) |
| Chân 62 | VAUX — Auxiliary voltage (decoupling pin) |
| Chân 63 | GND — Analog ground |
| Chân 64 | GND — Analog ground (tied to EPAD) |
Ứng dụng tiêu biểu
LTC2180IUP phù hợp cho 6 Áp dụngs: Software-Defined Radio (SDR) Diversity Receivers, Multi-Channel Ultrasound Imaging, Wideband Spectrum Analyzers, Industrial Data Acquisition (DAQ) Modules, Doppler Radar and Lidar Receivers, Multi-Channel Vibration & Acoustic Monitoring.
Software-Defined Radio (SDR) Diversity Receivers
The LTC2180IUP is a strong fit for diversity SDR front ends because both ADC channels sample simultaneously, preserving the relative phase information needed for I/Q demodulation. Its 90 dB SFDR and 77 dB SNR at 25 Msps clean up the crowded RF spectrum, while 0.07 ps RMS ultralow aperture jitter allows direct undersampling of IF stages without SFDR degradation. Power consumption is well below 1 W for a dual-channel receiver, easing thermal design in portable SDR platforms. The 64-QFN (9x9) exposed-pad package supports dense multi-channel tuner arrays, and the CMOS/LVDS selectable output simplifies FPGA interface design for software-defined baseband processing.
Được đề xuất
Multi-Channel Ultrasound Imaging
In multi-channel medical ultrasound, the LTC2180IUP's simultaneous sampling preserves the precise inter-channel delay required for beamforming. Its 16-bit resolution captures the wide dynamic range from weak echoes to strong specular reflections, while 77 dB SNR preserves grayscale depth. The 25 Msps rate is well-matched to 5-15 MHz transducer-bandwidth inputs after the LNA and TGC stage. The 64-QFN (9x9) package and pipelined architecture keep per-channel power low so 64- and 128-channel probe designs remain thermally manageable in compact carts and portable scanners.
Được đề xuất
Wideband Spectrum Analyzers
The LTC2180IUP suits real-time and swept spectrum analyzers that need low-noise digitizing at 25 Msps in a 9x9 mm QFN. The 90 dB SFDR preserves weak spurs near large signals during harmonic and IMD testing, and the wide input bandwidth supports direct sampling of low-IF stages in modern FFT analyzers. The simultaneous dual channels let engineers digitize both input and trigger/alignment paths without skew, simplifying calibration routines. With LVDS output to an FPGA-based FFT engine, designers can build analyzers that meet lab-grade dynamic-range specs in a compact bench footprint.
Được đề xuất
Industrial Data Acquisition (DAQ) Modules
Industrial DAQ modules benefit from the LTC2180IUP because its -40C to +85C industrial temp range covers factory-floor conditions and its 16-bit resolution handles transducer-level dynamic range. The simultaneous dual-channel capture is ideal for paired sensor measurements (strain gauges, accelerometers, and vibration probes). At 25 Msps the device digitizes not only steady-state process signals but also transient surge events down to microseconds, enabling predictive-maintenance algorithms. The 64-QFN (9x9) exposed-pad package ensures good thermal coupling in sealed module housings.
Được đề xuất
Doppler Radar and Lidar Receivers
For Doppler radar and lidar receiver IF stages, the LTC2180IUP delivers 16-bit / 25 Msps dual-channel conversion that supports coherent I/Q detection. The 0.07 ps RMS jitter preserves phase coherence of the I/Q baseband, directly impacting velocity resolution. Both channels sample simultaneously, enabling real-time I/Q processing in stationary or moving platforms. Low power consumption keeps battery-powered lidar units efficient, and the small 64-QFN (9x9) footprint eases integration into automotive and UAV sensor pods that demand tight PCB real estate.
Được đề xuất
Multi-Channel Vibration & Acoustic Monitoring
Predictive-maintenance and acoustic-emission systems leverage the LTC2180IUP's dual-channel simultaneity to capture correlated vibration and acoustic signatures across multiple accelerometers or microphones. The 16-bit resolution and 77 dB SNR reveal subtle fault patterns such as bearing-race spalling and gear-mesh chatter. The 25 Msps sample rate gives engineers significant anti-aliasing margin without requiring steep analog filter orders. The exposed-pad QFN package spreads self-heating across the PCB copper pour, allowing dense sensor-cluster boards to run continuously without thermal throttling.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho LTC2180IUP — 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 | LTC2180CUP | LTC2181IUP | LTC2182IUP | LTC2145CUP-12 | LTC2156IUP-14 |
|---|---|---|---|---|---|---|
| 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 | 64-QFN (9x9 mm) - same |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 16 bits | 16 bits | 16 bits | 16 bits | 14 bits | 14 bits |
| Sample Rate (per channel) | 25 Msps | 25 Msps | 40 Msps | 65 Msps | 65 Msps | 80 Msps |
| Number of Channels | 2 (dual) | 2 | 2 | 2 | 1 (single) | 2 |
| Temperature Grade | Industrial -40C to +85C | Commercial 0C to +70C | Industrial -40C to +85C | Industrial -40C to +85C | Commercial | Industrial |
| SNR | 77 dB | 77 dB | 77 dB | 76 dB | 73 dB | 68 dB |
| SFDR | 90 dB | 90 dB | 90 dB | 88 dB | 88 dB | 80 dB |
Bảo phân biệt quan trọng
- Dual-channel simultaneous sampling with ultralow 0.07 ps RMS jitter (vsLTC2145CUP-12)
- Lower sample rate at lower power and price than the LTC2182 (vsLTC2182IUP)
- Industrial temperature range over commercial grade alternative (vsLTC2180CUP)
- 16-bit resolution at 25 Msps maintains SNR vs faster lower-res alternatives (vsLTC2156IUP-14)
Ghi chú thiết kế
The LTC2180IUP requires separate analog (AVDD) and digital (DVDD/OVDD) 1.8V rails that must be decoupled aggressively near the pins. Estimated: assuming 250 mW total dissipation and a theta_JA in the 30-35 C/W range for the 64-QFN (9x9) mounted on a 4-layer PCB, junction temperature rise above ambient stays under 10C at room temperature. Place 0.1 uF MLCCs as close as possible to each AVDD/DVDD pin and at least one 10 uF tantalum or polymer bulk cap per rail.
The exposed thermal pad is the primary heat path and the substrate tie to analog ground. Solder the EPAD to a continuous copper pour that is stitched with multiple vias to the internal ground plane. Keep analog input traces, clock traces, and LVDS output traces on separate layers to avoid coupling; use 100-ohm differential impedance for LVDS outputs and 50-ohm controlled impedance for the ENC clock input. Avoid routing digital outputs directly under the package to prevent digital-to-analog feedback.
Drive the ENC/ENC-/ENCCLK pair as a differential pair with matched length and a low-jitter clock source such as the AD9516. Ultralow aperture jitter (0.07 ps RMS) is only meaningful if the input clock is low-jitter; any clock degradation above 1 ps RMS directly reduces SNR at high input frequencies. Use an isolating clock buffer or transformer if the LVDS output data clock or FPGA clock distribution cannot guarantee sub-picosecond jitter.
Drivers for the AIN+/AIN- inputs must be low-distortion at the signal frequency band, with output balance better than -40 dBFS second harmonic to avoid compression of the ADC's true SFDR. Estimated: a common-mode choke plus 50-ohm series terminations at each pin yields the cleanest results on wideband inputs. Do not run the LVDS outputs at OVDD above 1.9V when connected to lower-voltage FPGAs without level shifters. Avoid hot-plugging the analog inputs without proper sequencing, since unpowered ADC inputs can drive current into the AVDD rail.
Although the LTC2180IUP is rated for the industrial temperature range, the user must still respect maximum junction temperature (typically 125C or 150C depending on datasheet version). Estimated thermal resistance for the 64-QFN (9x9) with EPAD on a 4-layer JEDEC test board is around 30 C/W. In a sealed enclosure with limited airflow, derate sample rate or supply voltage to maintain margin; consider the LTC2180CUP commercial-grade variant for benign thermal environments.
Thông tin tuân thủ
RoHS and lead-free (PBF suffix) per Analog Devices product page. Not AEC-Q100 qualified; for automotive imaging or radar choose an automotive-graded ADC family such as the ADI ADI9204/ADI9384 line.
