updates

-| [[74xx1G14-dat]] | inverting buffer | | |

-

-# NE5532-dat

-

-

-

-- [chip DS ](https://www.ti.com/lit/ds/symlink/ne5532.pdf)

-

-NE5532x, SA5532x Dual Low-Noise Operational Amplifiers

-

-

-

-

-## boards

-

-- [[AMP1017-dat]]

-

-

-## appliction amplifier

-

-VCC+ Supply voltage: 5 ~ 15 V

-

-d

-

-

-## audio amplifier SCH

-

-- [[virtual-ground-dat]] - by [[voltage-divider-dat]]

-

-the gain is 15K / 2.2K

-

-

-

-

-## ref

-

-- [[TI-dat]] - [[resistor-dat]]

-

-# PCM5102-dat

-

-https://www.ti.com/product/PCM5102

-

-https://www.ti.com/lit/ds/symlink/pcm5102.pdf?ts=1733652266351&ref_url=https%253A%252F%252Fwww.ti.com%252Fproduct%252FPCM5102

-

-- [[AMP1006-dat]]

-

-- A_VDD

-- D_VDD

-

-## 1.8V logic tolerant consideration

-

-The I2S signals on the PCM5122 are typically not guaranteed to reliably tolerate 1.8V logic levels.

-

-You should use level shifters to safely interface a 1.8V system with the PCM5122, especially for high-speed communication like I2S.

-

-

-

-

-

-## ref

-

-- [[PCM5122-dat]]

-

-# PCM5122-RPI-dat.md

-

-1) Modify the config.txt on termianl. Open the config.txt in system.

-

- sudo nano /boot/config.txt

- sudo nano /boot/firmware/config.txt

-

-Append the following lines to the end of the file,enable the audio module.Draw attention to theformat , Otherwise it doesn't work. press "ctrl+o" and press "Enter" to save the file. Reboot thesystem.

-

- dtoverlay=allo-boss-dac-pcm512x-audio

-

-

-

-and not yet tested:

-

- dtoverlay=i2s-mmap

- dtoverlay=hifiberry-dacplus

-

-2)Check the DAC module

-

-Type in the commands that are shown below. You can see the BossDAC, the 3 is the dac devicenumber.

-

- aplay -l

- cat /proc/asound/cards

-

-

-

-

-

-## after installation

-

-command will read UU instead

-

- i2cdetect -y 1

-

- 0 1 2 3 4 5 6 7 8 9 a b c d e f

- 00: -- -- -- -- -- -- -- --

- 10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --

- 20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --

- 30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --

- 40: -- -- -- -- -- -- -- -- -- -- -- -- -- UU -- --

- 50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --

- 60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --

- 70: -- -- -- -- -- -- -- --

-

-unset dtoverlay=allo-boss-dac-pcm512x-audio will return to 0x4d:

-

- 0 1 2 3 4 5 6 7 8 9 a b c d e f

- 00: -- -- -- -- -- -- -- --

- 10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --

- 20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --

- 30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --

- 40: -- -- -- -- -- -- -- -- -- -- -- -- -- 4d -- --

- 50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --

- 60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --

- 70: -- -- -- -- -- -- -- --

-

-# PCM5122-dat

-

-https://www.ti.com/lit/ds/symlink/pcm5122.pdf?ts=1733217884746&ref_url=https%253A%252F%252Fwww.google.com%252F

-

-PCM512x 2-VRMS DirectPath™, 112-dB and 106-dB Audio Stereo DACsWith 32-Bit, 384-kHz PCM Interface

-

-

-## About PCM5122

-

-- Upgrade DAC chip, using BB (acquired by TI) More high-end PCM5122 chip,

- - Using I2S interface, not USB, control volume and audio via I2C interface.

- - Supports 16- to 32-bit audio data formats

- - Distortion and dynamic are very good,

- - Support high 384kHz sampling rate,

- - Dynamic range 112dB, Distortion -93Db.

- - Soft rising or falling ramp and analog squelch for 120dB squelch SNR with no pops.

-- PCM5122 also integrates a negative charge pump, the output without DC blocking capacitors; 2.1Vrms ground center output; Very good ability to suppress out-of-band noise. By supporting loads as low as 1kΩ, the PCM510xA can drive multiple parallel products. (That is, more than one amplifier at the same time).

-- The output ports are gold plated RCV double terminals and gold plated 3.5mm headphone holder

-- Isolated power supply design, the raspberry pie power supply and DAC part of the independent power isolation, and mutual non-interference through the beads, get rid of the current sound

-- Solderless, plug directly to the expansion board can be used, and the use of I2S interface directly decode digital to analog, non-USB DAC interface,

-- Increase for the two-color led to provide status display, red light for the DAC power indicator (power is bright), green for the DAC work status lights (work decoding, light, stop or not work off), a better understanding of the work of the DAC

-- Perfect compatible Raspberry Pi official PI HAT size, PCB board with high gold plating process, curved alignment (high-end HIFI DAC arc alignment), better signal continuity and reduce the signal reflection and refraction.

-

-

-## Function Diagram

-

-- [[PCM1863-dat]] - [[TPA3130-dat]] - [[TPA6120-dat]] - [[MSP430-dat]]

-

-- [[I2S-dat]]

-

-

-

-

-

-- normally use the [[SPI-dat]] output

-

-

-## demo video

-

-- https://x.com/electro_phoenix/status/1871071433797046460

-

-

-## Board

-

-- [[MPC1083-dat]]

-

-

-## ref

-

-

-[PCM2906C](https://www.ti.com/product/PCM2906C)

-Stereo USB CODEC with line out and S/PDIF, Bus-powered

-

-

-- [[audio-dat]]

-- [[PCM2906-dat]] -> DOUT -> TX -> [[FC300T-dat]] ->

-- [[FC300T-dat]] -> RX -> [[OPA2308-dat]] -> DIN -> [[PCM2906-dat]]

-