Chip-cn-dat/everest-semi-dat/ES7201-dat/2026-05-03-09-33-14.png
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Chip-cn-dat/everest-semi-dat/ES7201-dat/ES7201-dat.md
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# ES7201-dat
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+- [[adc-dat]] - [[pdm-dat]] - [[pga-dat]] - [[audio-dat]]
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+
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+High Performance PDM Stereo Audio ADC
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+
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+FEATURES
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+- • High performance advanced deltasigma audio ADC
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+- • 90 dB dynamic range at 26 dB PGA
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+- • -85 dB THD+N
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+- • Low noise PGA
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+- • 8 to 96 kHz sampling frequency
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+- • Low power
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+
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+APPLICATIONS
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+- • Mic Array
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+- • Soundbar
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+- • Audio Interface
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+- • Digital TV
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+- • A/V Receiver
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+- • DVR
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+- • NVR
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+
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+
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+## std app
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+
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+![](2026-05-03-09-33-14.png)
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+
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## app 1.
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-![](2026-04-14-19-56-20.png)
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+![](2026-04-14-19-56-20.png)
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+
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+
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+
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+## ref
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+
Chip-cn-dat/everest-semi-dat/ES8311-dat/ES8311-dat.md
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# ES8311-dat
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+- [[adc-dat]] - [[dac-dat]] - [[record-dat]] - [[playback-dat]] - [[everest-semi-dat]]
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+
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## ES8311
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refer use guide in [[I2S-SDK-dat]]
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The ES8311 is a low-power mono audio codec with fully differential output and headphone amplifier, as well as analog inputs that are programmable in fully differential configurations.
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-The record path of the ES8311 contains one fully differential input, analog digitally controlled mono microphone preamplifier,and automatic gain control (ALC). Programmable filters are available during record which can remove audible noise.
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+The record path of the ES8311 contains `one fully differential input`, analog digitally controlled mono microphone `preamplifier`,and automatic gain control (`ALC`). Programmable filters are available during record which can remove audible noise.
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-The playback path includes a mono DAC, through programmable volume controls, to the fully differential output. The fully differential output of ES8311 has a capability to drive 16Ω or 32Ω headphone load.
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+The `playback` path includes a mono DAC, through programmable volume controls, to the fully differential output. The fully differential output of ES8311 has a capability to drive 16Ω or 32Ω headphone load.
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ES8311 is optimized for voice playback/record, so that it is very suitable for surveillance and voice application, such as car DV, IPCAMERNA, DVR, NVR, Baby monitor, intelligent toy, intelligent Robert, etc.
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-ADC RECORD FUNCTIONS
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+ADC `RECORD` FUNCTIONS
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3. 100dB SNR, -88dB THD+N
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4. Differential analog input
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8. Supports analog and digital microphone interface
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-DAC PLAYBACK FUNCTIONS
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+DAC `PLAYBACK` FUNCTIONS
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9. 110dB SNR, -85dB THD+N
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10. Dynamic Range Compression for analog output
Tech-dat/Interface-dat/interface-dat.md
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@@ -59,6 +59,8 @@ long range secure by cable - [[RS485-dat]] - [[fiber-optic-dat]] - [[POF-dat]] -
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- [[HUB75-dat]] - [[HUB08-dat]] - [[HUB30-dat]] - mono-color == [[HUB12-dat]] - [[led-rgb-panel-dat]]
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+- [[parallel-pin-dat]]
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+
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## special interface
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- [[powerbus-dat]]
Tech-dat/audio-dat/PGA-dat/PGA-dat.md
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+
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+# PGA-dat
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+
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+
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+### Audio Programmable Gain Amplifier (PGA) Overview
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+
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+An **Audio PGA** is a specialized circuit used to bridge the gap between digital control and analog audio signals. It allows a microcontroller to precisely adjust the volume or signal strength of an audio path without the mechanical wear or signal degradation associated with traditional potentiometers.
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+
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+---
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+
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+### 1. Functional Block Diagram
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+A typical Audio PGA consists of three main stages:
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+* **Digital Interface:** Receives gain commands via `I2C`, `SPI`, or `parallel pins`. - [[interface-dat]]
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+* **Control Logic:** Translates digital bits into specific switch configurations.
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+* **Resistor Ladder / Op-Amp:** A network of high-precision resistors that physically changes the gain of the analog signal.
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+
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+
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+
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+---
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+
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+### 2. Key Technical Specifications
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+
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+| Parameter | Importance in Audio |
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+| :--- | :--- |
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+| **Gain Range** | Typically ranges from attenuation (e.g., -95 dB) to boost (e.g., +31 dB). |
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+| **Step Size** | The resolution of control, often 0.5 dB or 1.0 dB per step for smooth transitions. |
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+| **THD+N** | Total Harmonic Distortion + Noise; essential for maintaining "Hi-Fi" transparency. |
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+| **Crosstalk** | The isolation between left and right channels in stereo PGA chips. |
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+
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+---
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+
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+### 3. Advanced Features
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+
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+#### Zero-Crossing Detection (ZCD)
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+One of the most critical features in audio PGAs. If gain changes exactly when a sound wave is at its peak, it creates an instant voltage jump, heard as a "click" or "pop." ZCD waits until the audio signal crosses **0V** before applying the new gain setting, ensuring a silent transition.
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+
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+
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+
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+#### Mute Functionality
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+Most PGAs include a hardware or software "Mute" bit that quickly pulls the output to ground or high-impedance, useful for power-on sequences to protect speakers.
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+
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+---
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+
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+### 4. Hardware Implementation Example
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+When connecting an Audio PGA to a system, the wiring generally follows this pattern:
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+
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+1. **Analog Section:**
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+ * **$V_{in}$:** The low-level audio signal (e.g., from a DAC or microphone).
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+ * **$V_{out}$:** The amplified signal heading to a power amp or ADC.
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+ * **Analog Ground ($AGND$):** Kept separate from digital ground to prevent noise.
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+2. **Digital Section:**
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+ * **$SCLK / SDATA$:** Communication lines from the controller.
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+ * **$CS$ (Chip Select):** Used to address the specific PGA in a multi-chip array.
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Tech-dat/audio-dat/audio-dat.md
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# audio-dat
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-
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+- [[adc-dat]] - [[pdm-dat]] - [[pga-dat]] - [[audio-dat]]
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- [[audio-dat]] - [[codec-audio-dat]] - [[amplifier-audio-dat]] - [[speaker-dat]] - [[speaker-I2S-dat]] - [[DAC-dat]]
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