Key facts
- Brand
- Analog Devices
- Model
- CN-0205
- Category
- Other Electronics
- Industry
- Electronics
- Documents
- 2
- Languages
- ZH · EN
- Last added
- 2026-10-21
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Analog Devices CN-0205 Circuit Note
This document details a laboratory circuit design for interfacing the dual-channel, 1.2 GSPS, 16-bit TxDAC AD9122 with the broadband I/Q modulator ADL5375-05. The design supports both zero-IF and complex-IF architectures and includes a complete evaluation board design (AD9122-M5375-EBZ).
The note provides specific guidance on signal biasing, gain matching, and filtering. It describes the use of 50 Ω grounding resistors for biasing and recommends specific filter topologies, such as a 300 MHz fifth-order Butterworth filter, to suppress Nyquist images and spurs. Additionally, it covers level shifting techniques for driving the ADL5375-15 variant and offers layout recommendations to ensure signal integrity. This manual is written in Chinese.
Analog Devices CN-0205 specifications
| DAC Sampling Rate | 1.2 GSPS |
|---|---|
| Modulator Type | Broadband I/Q Modulator |
| Recommended Filter Bandwidth | 300 MHz |
| Filter Order | Fifth-order Butterworth |
| Bias Voltage (ADL5375-05) | 500 mV |
| Bias Voltage (ADL5375-15) | 1500 mV |
All Analog Devices CN-0205 documents by type
How to use the product for one specific task, with worked examples.
Questions answered in these manuals
Is an active level conversion circuit required for the ADL5375-05?
No, because the DAC output and the ADL5375-05 I/Q modulator input share the same 0.5 V bias level, so no active or passive level conversion circuit is needed.
What is the recommended value for the load resistor RL?
For most applications, a value of 100 Ω is recommended, which results in a full-scale signal level of 1 V p-p.
Does this interface require level shifting circuitry?
No, because the DAC outputs and ADL5375 I/Q inputs share the same 0.5V bias level.
From: Analog Devices CN-0205 DAC Modulator Interface Circuit Note
Which architectures are supported by this interface?
Both zero-IF (ZIF) and complex-IF (CIF) architectures are supported.
From: Analog Devices CN-0205 DAC Modulator Interface Circuit Note