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Analog Devices Inc. LTC2185CUP#PBF
- Part No.:
- LTC2185CUP#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 64-WFQFN Exposed Pad
- Datasheet:
-
LTC2185CUP#PBF.pdf
- Description:
- IC ADC 16BIT PIPELINED 64QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,678
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Product details
Overview
LTC2185CUP#PBF from Analog Devices (formerly Linear Technology) is a 16-bit, dual-channel, simultaneous-sampling analog-to-digital converter with 125Msps sampling rate, 76.8dB SNR, and 90dB SFDR. It operates from a single 1.8V supply, supports CMOS/DDR-CMOS/DDR-LVDS outputs, and targets high-performance communications systems including cellular base stations and software-defined radios.
For engineers reviewing the LTC2185CUP#PBF datasheet, LTC2185CUP#PBF pinout, LTC2185CUP#PBF application, or LTC2185CUP#PBF equivalent, key selection criteria include its 550MHz full-power bandwidth, ultralow 0.07psRMS jitter, ±2LSB INL, 1.8V single-supply operation, and configurable output interface modes for system-level timing and signal integrity optimization.
Technical Context
The LTC2185CUP#PBF integrates two independent 16-bit ADC cores sharing a common sample-and-hold with 550MHz full-power bandwidth and 0.07psRMS acquisition jitter-enabling undersampling of IF signals up to 140MHz while maintaining 76.8dB SNR at 125Msps. Its dual-channel architecture supports true simultaneous sampling with ±0.3% gain matching and ±1.5mV offset matching.
Digital interface flexibility includes full-rate CMOS, DDR-CMOS, or DDR-LVDS outputs, each with separate OVDD supply (1.2V–1.8V for CMOS; 1.7V–1.9V for LVDS). Configuration is handled via a serial SPI port supporting shutdown, nap, clock duty cycle stabilization, and data randomization-critical for spectral purity in SDR and medical imaging applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit with no missing codes over temperature-ensures monotonicity and precision in wide-dynamic-range signal capture. |
| Sampling Rate | 125Msps-supports Nyquist sampling of signals up to 62.5MHz or undersampling of IF bands up to 140MHz. |
| SNR / SFDR | 76.8dB SNR and 90dB SFDR at 70MHz input-meets stringent spectral purity requirements for cellular and radar receivers. |
| Input Bandwidth | 550MHz full-power bandwidth-enables direct RF sampling of L-band and lower S-band signals without external amplification. |
| Power Consumption | 370mW total at 125Msps with CMOS outputs-balances performance and thermal management in dense PCB layouts. |
| Jitter Performance | 0.07psRMS aperture jitter-minimizes noise floor degradation when undersampling high-frequency carriers. |
| INL / DNL | ±2LSB INL and ±0.5LSB DNL (typ)-guarantees accurate amplitude fidelity for measurement and imaging applications. |
Pinout & Package
Package: 64-lead (9mm × 9mm) plastic QFN with exposed thermal pad (Pin 65 = GND), rated for 0°C to 70°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (1,16,17,64) | Analog power supply | 1.7V–1.9V supply for ADC core; requires local 0.1µF ceramic bypassing per group. |
| AIN1+/AIN1– (4,5) | Differential analog input, Channel 1 | Accepts 1VP-P to 2VP-P differential signal; biased by VCM1 (Pin 2). |
| ENC+/ENC– (18,19) | Differential encode clock input | Triggers conversion on both edges; supports single-ended mode when ENC– tied to GND. |
| D1_0–D1_15 / D2_0–D2_15 (23–32, 43–58, 38–39, etc.) | Parallel digital data outputs | Configurable as full-rate CMOS, DDR-CMOS, or DDR-LVDS; output swing set by OVDD (Pin 42). |
| PAR/SER (11) | Programming mode select | Ground = SPI configuration; VDD = parallel control of basic functions (e.g., shutdown, randomizer). |
| CS/SCK/SDI/SDO (20–22,61) | SPI interface | Enables real-time reconfiguration of output format, clock stabilizer, nap/shutdown, and data randomization. |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous dual-channel sampling | Eliminates inter-channel skew for coherent I/Q demodulation and beamforming in phased-array systems. |
| Configurable output interface | Supports CMOS, DDR-CMOS, or DDR-LVDS-enables optimal signal integrity and power trade-offs across FPGA or ASIC interfaces. |
| Optional clock duty cycle stabilizer | Compensates for asymmetric clock sources, preserving AC performance even with 30%–70% duty cycles at 125MHz. |
| Data output randomizer | Reduces deterministic spectral spurs caused by periodic patterns in repetitive input waveforms-critical for MRI and ultrasound digitization. |
| Low-power nap/shutdown modes | 16mW nap and 1mW sleep power states enable dynamic power scaling in battery-powered portable medical or test equipment. |
Applications
| Cellular Base Stations | Software Defined Radios |
|---|---|
Use Scenario: Digitizing dual-path receive signals in LTE/5G macrocell and small-cell transceivers. IC Role / Device Role / Timing Role: Simultaneous-sampling dual ADC capturing I/Q baseband or IF signals with <1ps inter-channel skew. Use Value: Enables precise channel calibration and MIMO processing using 76.8dB SNR and ±0.3% gain matching across channels. | Use Scenario: High-fidelity IF sampling in field-programmable SDR platforms supporting multi-standard waveform agility. IC Role / Device Role / Timing Role: Wideband ADC front-end with 550MHz input bandwidth and 0.07psRMS jitter for clean undersampling of 70MHz+ IFs. Use Value: Delivers 90dB SFDR and configurable DDR-LVDS outputs to maintain signal integrity into high-speed FPGA fabric. |
| Portable Medical Imaging | Multi-Channel Data Acquisition |
Use Scenario: Ultrasound beamformer digitization requiring low-noise, low-distortion sampling of echo return signals. IC Role / Device Role / Timing Role: Dual-channel ADC with data randomizer and nap mode for artifact suppression and power-constrained handheld devices. Use Value: 76.8dB SNR and optional randomizer reduce periodic artifacts in B-mode imaging; 370mW total power enables thermal design in compact enclosures. | Use Scenario: Precision test and measurement systems acquiring synchronized analog waveforms across multiple sensors. IC Role / Device Role / Timing Role: Simultaneous-sampling ADC with ±2LSB INL and ±0.5LSB DNL for calibrated voltage/current measurements. Use Value: Ensures traceable accuracy in automated test equipment and industrial process monitoring where linearity and repeatability are critical. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel, high-speed ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD9680BCPZ-125 | 14-bit, 125Msps, JESD204B serial output, higher power (1.5W), wider temp range (–40°C to +85°C) | Targets JESD204B-based FPGA platforms; lacks parallel CMOS/DDR-LVDS flexibility | Select when system uses JESD204B interface and requires extended temperature operation. |
| ADS52J90IRGCT | 16-bit, 100Msps, quad-channel, LVDS-only, 1.8V/3.3V supplies, no internal reference | Offers four channels in same package but lower sample rate; requires external reference and level-shifting | Select when channel count >2 is needed and external reference design is acceptable. |
Compared with AD9680BCPZ-125 and ADS52J90IRGCT, the LTC2185CUP#PBF provides superior SNR (76.8dB vs. 72.5dB/74.2dB) and lower power (370mW vs. 1500mW/850mW) at 125Msps, while offering unmatched interface flexibility (CMOS/DDR-CMOS/DDR-LVDS) and integrated reference-ideal for space- and power-constrained communications and imaging designs.
Availability
LTC2185CUP#PBF is available at Aetrix Electronics and suitable for cellular infrastructure, portable medical imaging, and software-defined radio applications requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.
Supply support for LTC2185CUP#PBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving communications, industrial, automotive, and healthcare markets.
The LTC2185CUP#PBF belongs to ADI's high-speed precision ADC product line, designed specifically for demanding wideband digitization in communications infrastructure, instrumentation, and medical imaging where SNR, SFDR, and channel matching are critical.
FAQ
What is the operating temperature range for the LTC2185CUP#PBF?
The LTC2185CUP#PBF is specified for 0°C to 70°C ambient operation (C-grade), as confirmed by the "Order Information" table in the datasheet. This distinguishes it from the I-grade variants (e.g., LTC2185IUP#PBF) rated for –40°C to +85°C. Thermal design must ensure junction temperature remains below 150°C, with θJA = 20°C/W.
Does the LTC2185CUP#PBF support differential analog inputs?
Yes, the LTC2185CUP#PBF supports fully differential analog inputs on both channels: AIN1+ (Pin 4) and AIN1– (Pin 5) for Channel 1; AIN2+ (Pin 12) and AIN2– (Pin 13) for Channel 2. Input common-mode voltage is internally set to VDD/2 via VCM1/VCM2 pins, and the device achieves 80dB CMRR-essential for rejecting noise in high-density PCB layouts.
What output interface modes does the LTC2185CUP#PBF support?
The LTC2185CUP#PBF supports three configurable digital output modes: full-rate CMOS, double-data-rate CMOS, and double-data-rate LVDS. Output voltage swing is set by OVDD (Pin 42), which can be 1.2V, 1.5V, or 1.8V for CMOS modes, and 1.7V–1.9V for LVDS. Mode selection is controlled via SPI register writes or parallel programming depending on PAR/SER (Pin 11) state.
How is the LTC2185CUP#PBF configured for low-power operation?
The LTC2185CUP#PBF offers two low-power states: Nap mode (16mW) and Sleep mode (1mW), both enabled via SPI register writes. Nap mode retains register settings and reference bias while disabling ADC cores; Sleep mode powers down all circuitry except wake-up logic. Both modes are accessible through the serial SPI port (CS/SCK/SDI/SDO) or parallel control when PAR/SER = VDD.
Can the LTC2185CUP#PBF perform simultaneous sampling on both channels?
Yes, the LTC2185CUP#PBF features true simultaneous sampling across both channels using a shared sample-and-hold amplifier. This architecture ensures sub-picosecond inter-channel skew and guarantees coherent capture for I/Q demodulation, beamforming, and phase-sensitive measurements-validated by ±0.3% gain matching and ±1.5mV offset matching specs in the datasheet.
LTC2185CUP#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 64-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 125M
- Number of Inputs:
- 2
- Input Type:
- Differential
- Data Interface:
- LVDS - Parallel, Parallel
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 2
- Architecture:
- Pipelined
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 1.7V ~ 1.9V
- Voltage - Supply, Digital:
- 1.7V ~ 1.9V
- Features:
- Simultaneous Sampling
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 64-QFN (9x9)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2185CUP#PBF FAQ
1.How can I place an order for LTC2185CUP#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2185CUP#PBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LTC2185CUP#PBF reliable?
The price and inventory of LTC2185CUP#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2185CUP#PBF is usually 5 days.
3.What payment methods are accepted for LTC2185CUP#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2185CUP#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2185CUP#PBF?
LTC2185CUP#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2185CUP#PBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LTC2185CUP#PBF?
For technical support, including LTC2185CUP#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2185CUP#PBF requirements.
6.How does Aetrix verify that LTC2185CUP#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2185CUP#PBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LTC2185CUP#PBF meets industry standards.
7.What is the process for return or replacement of LTC2185CUP#PBF?
All LTC2185CUP#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2185CUP#PBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LTC2185CUP#PBF part is unused and in its original packaging.
Return procedure for LTC2185CUP#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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