Board-dat/DVA/DVA1014-dat/DVA1014-dat.md
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- [[LGT8F328-DAT]] - [[LGT8F328-SSOP20-dat]] - [[LGT-dat]] - [[arduino-dat]] - [[LGT8F328-SDK-DAT]]
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+- [[LDO-dat]]
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+
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+
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![](2026-02-07-17-55-41.png)
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## Applications, category, tags, etc.
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## Demo Code and Video
Chip-dat/Analog-device-dat/AD-signal-dat/AD-signal-dat.md
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# AD-signal-dat
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+- [[DDS-dat]]
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+
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- [[RS232-dat]] - [[RS422-dat]] - [[RS485-dat]]
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Tech-dat/signal-dat/DDS-dat/DDS-dat.md
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+# DDS-dat
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+
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+- [[filter-dat]] - [[DAC-dat]]
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+
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+DDS, or Direct Digital Synthesis, is a specific method used by modern signal generators to create these waveforms digitally.
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+
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+
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+## How DDS Works
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+Unlike old-school analog generators that use physical capacitors and inductors to oscillate, DDS builds a wave "by the numbers."
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+1. **Phase Accumulator:** Think of this as a digital wheel spinning at a set speed. The faster it spins, the higher the frequency.
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+2. **Lookup Table (ROM):** This stores the digital "coordinates" of a perfect wave (e.g., a Sine wave). The accumulator tells the table which coordinate to look at next.
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+3. **DAC (Digital-to-Analog Converter):** Converts those digital coordinates into an actual voltage level.
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+4. **Low-Pass Filter:** Smooths out the "staircase" steps from the digital conversion into a clean, smooth wave.
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+
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+
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+
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+
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+## Chips
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+
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+### AD9833 — Programmable Waveform Generator
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+- Module: AD9833 Programmable Waveform Generator Module (Sine, Triangle, Square)
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+- Link: [[AD-signal-dat]]
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+
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+Short description: The AD9833 from Analog Devices is a low-power (≈12.65 mW) programmable DDS waveform generator that produces sine, triangle and square waves. It operates from 2.3 V to 5.5 V and is controlled over a simple 3-wire SPI-compatible interface for easy microcontroller integration.
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+Key specifications
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+| Parameter | Value |
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+|---|---:|
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+| Supply voltage | 2.3 V – 5.5 V |
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+| Typical power | ≈12.65 mW |
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+| Waveforms | Sine, Triangle, Square (square via MSB toggling) |
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+| Maximum output frequency | Up to 12.5 MHz (depending on clock) |
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+| Interface | 3-wire SPI (compatible with Arduino, DSP) |
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+| Frequency resolution | 28-bit frequency register (≈0.1 Hz resolution with 25 MHz clock) |
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+| Output | Unbuffered; typical up to ~0.65 Vpp (sine/triangle) depending on supply and load |
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+| Special modes | Power-down (SLEEP) mode |
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+
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+Notes
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+
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+- The AD9833 provides a frequency tuning word (28-bit) that gives very fine frequency resolution when driven by a stable reference clock (example: ~0.1 Hz resolution with a 25 MHz clock).
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+- The raw output is unbuffered; add a buffer/amplifier or filtering stage (LPF) if you need larger amplitude or lower harmonic content.
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+
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+Common uses
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+- Low-cost frequency and waveform generation for test rigs
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+- Excitation signals for flow meters and sensors
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+- Sensing, actuation, and time-domain reflectometry (TDR)
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+- Impedance spectroscopy and other lab instrumentation
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+
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+
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+## ref
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+
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+- [[signal-dat]] - [[DDS-dat]]
Tech-dat/signal-dat/signal-dat.md
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- [[comparator-dat]] - [[circuits-dat]]
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-
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+- [[signal-dat]] - [[DDS-dat]]
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## unsort