Audio forum - Recent Threads

TAS2563: Minimum Supported Audio Format and SBCLK Frequency for TAS2563 Mono Recording

Sakshi Koundal — Fri, 13 Mar 2026 09:34:01 GMT

Part Number: TAS2563
Other Parts Discussed in Thread: AM623

Hi Team,

we are using the TAS2563 audio codec for playback and recording with AM623 processor (mono channel configuration) and want to minimize file size while maintaining good quality. According to datasheet, only certain SBCLK frequencies are supported for 48 kHz-based sample rates.

We want to record and play back at 16 kHz, 16-bit, mono, but the calculated BCLK for this configuration (16 kHz × 16 bits × 1 channel = 0.256 MHz) is not listed in the supported SBCLK frequencies. If we use any other parameters and get lower SBCLK then mentioned in the table, the speaker out/in waveform looks distorted, we are able to achieve 1.5Mhz with 48Khz and 32 bit the comparative file size(1.9Mb) for 10s recording is almost 8 times then 16Khz-16bit(320Kb).

Is it possible to use 16 kHz, 16-bit, mono with the TAS2563, or are we limited to the minimum supported SBCLK (e.g., 1.024 MHz)?
If not, what is the recommended configuration for minimum file size and good quality in mono mode?

Please help us with this.

LM5122: I would like you to review the circuit and PCB layout that use the LM5122.

Nomura Kousaku — Fri, 13 Mar 2026 04:43:54 GMT

Part Number: LM5122

DCDC circuit diagram.pdf PCB layout_0313_2.pdf Power management forum _ LM5122_ The LM5122 is not operating as expected_.msg

Hello. I am currently designing a circuit using the LM5122.

Four months ago, I sent you various questions via email with attachments, and I am now proceeding with the design for a new PCB. I would appreciate it if you could review the PCB layout and let me know if you have any concerns or if you find any potential issues.

PCM6260-Q1: PCM6260 inquiry

Will Wang47 — Fri, 13 Mar 2026 01:12:24 GMT

Part Number: PCM6260-Q1

Hi team,

Customer implemented AC coupling for Line-in with the PCM6260. For DC diagnostics under AC coupling conditions, are there alternatives to the method shown below that doesn't require sacrificing channels?

Regards,

Will

TAS5802: Example of TAS5802 initialization configuration code

Vayne Li — Thu, 12 Mar 2026 13:10:53 GMT

Part Number: TAS5802

Hi Teams,

Can TI provide an example of TAS5802 initialization configuration code? Or other reference codes can be provided for customers' reference, which can be initialized first to produce sound before adjusting parameters. The platform they use is STM32F chip.

TPA3138D2: Regarding Thermal Characteristics

Ryu Yamashita — Thu, 12 Mar 2026 06:08:55 GMT

Part Number: TPA3138D2

Hi team,

The datasheet lists the recommended operating range for this device as -10°C to 85°C, but the product page and the application note below state it as -40°C to 85°C.
Is the information in the datasheet correct?

TPA3138 Transition Guide – from TPA3110, TPA3113

Best Regards,
Ryu.

RC4580: RC4580IDR Application support

lei ping — Thu, 12 Mar 2026 03:57:24 GMT

Part Number: RC4580

Dear

Our company is using product RC4580IDR, batch number 2527. It immediately burned out upon being attached to the board after welding. Could you please check if this is related to the application design? Thanks a lot.

TLV320AIC3104-Q1: Request for TLV320AIC3104-Q1 schematic review

SHOTA SAITO — Thu, 12 Mar 2026 00:42:47 GMT

Part Number: TLV320AIC3104-Q1

Questions about the TLV320AIC3104-Q1

1.Can we consider 6PAIC3104IRHBRQ1 and TLV320AIC3104-Q1 to be the same device?

2.Please review our schematic.
A cable goes to an external microphone; the audio signal comes in from this cable.
We plan to communicate with the MCU through I²S.
If you think we should connect anything else, please let us know.

3.How should we handle the pins we will not use?
At the moment we expect the following pin numbers to be unused:
12, 13, 14, 16, 19, 20, 22, 23, 27, 28, 29, 30.

You can download the file from the following URL:
https://download.transfer.hennge.com/LNPk0A4RLneDvN
The URL is valid until: 2026-03-17 23:59 (Japan Standard Time)
File download password:
GpGw03_kglwl

PCM1809: PCM1809 No Data Output

Maurice Shelton — Wed, 11 Mar 2026 19:37:13 GMT

Part Number: PCM1809
Other Parts Discussed in Thread: PCM1808

I have designed a circuit with PCM1809. I am using it as the controller and I am supplying the 6MHz master clock on the MD1 pin. I have a 500mvpp 4KHz signal on the IN1P and IN2P pins (signal ended).

All supply voltage and control pin levels look correct. The PCM1809 is outputting the correct FSYNC and BCLK signals but the SDOUT line is always low (there is never a high level on this data line).

I had 5 eval PCB assembled and all have this same problem.

I have tried to drop my circuit diagram in this box, but I keep getting a failed to load png file messsage.

Do you have any ideas what may be keeping the data line low??

I have experience with the PCM1808 and a few other A2D converters of this type, but this problem has me stumped.

Thanks

Maurice

TAS5815: What to bias PVDD to as default voltage setpoint?

Cameron Wutzke — Wed, 11 Mar 2026 18:59:19 GMT

Part Number: TAS5815

Hey Sydney,

What do you recommend for the default voltage output setpoint? I understand the rail will move up and down based on feedback from the TAS5815, but I'm not quite sure where to set the default point.

Here's my understanding after chatting with an LLM:

When Class-H is OFF (disabled):

PWM signal = LOW (ground)
Buck-boost operates at maximum boost output
Provides full voltage headroom you designed for
This is the "safe" default state with maximum available power

When Class-H is ON (enabled):

No audio signal:

PWM signal = HIGH
Buck-boost operates at minimum boost output
Conserves power when no signal present

With audio signal:

PWM modulates between HIGH and LOW
Buck-boost tracks the signal envelope
Voltage adjusts dynamically based on instantaneous needs

I get confused (we are not using PPC3) , and do not understand the actionable next step. In my mind there would be a register in TAS5815 to define the output voltage level controlling the buck-boost. I get confused where to go from here

PCM1796: PCM1796 REFERENCE VOLTAGE DECOUPLING CAPACITORS

Vicente Polo — Wed, 11 Mar 2026 15:44:18 GMT

Part Number: PCM1796

We are needing some technical help from Texas Instruments:

We have been using the PCM1796 DAC for years and recently found a batch of boards that failed testing. We investigated the cause of the problem and found that it was always caused by excessive leakage current in the decoupling capacitors connected to pins 21 and 22 (VCOML and VCOMR).

We have been using for many years Kemet 100uF tantalum decoupling capacitors for these two capacitors. The leakage current of these capacitors is always very low, less than 0.1 microamperes. However, recently, some of these capacitors have a leakage current of up to 3 microamperes, and in this case, we see a very large shift in the DAC output current.

In the PCM1796 datasheet, we have not found any explanation of how the leakage current from these capacitors can affect the operation of the DAC, nor have we found any recommendations on the type of capacitor that should be used to decouple these two pins.
We have seen that although there are two separate pins for these decouplings, in the schematic proposed by TI for using this component, they join these two pins and use a single decoupling capacitor.

In summary, our questions are:

1.- What effect does the leakage current from the decoupling capacitors used for the pins 21 VCOML and 22 VCOMR have on the DAC's operation?

2.- What capacitor does TI recommend for these decouplings and what is the maximum tolerable leakage current in that capacitor?

3.- Is it advisable to join the two pins and use a single capacitor, or is it better to use two separate capacitors? Could this affect any operating specifications, such as crosstalk between channels?

TPA3223: TPA3223 pin-to-pin compatibility with TPA3221

Fabio Coccomeri — Wed, 11 Mar 2026 14:55:17 GMT

Part Number: TPA3223
Other Parts Discussed in Thread: TPA3221,

Hello,
in several of your documents it is stated that the TPA32xx series has pin-to-pin compatibility.
On the TPA3221 page, the TPA3223 is also listed as pin-for-pin compatible.

However, from the datasheets it appears that the TPA3223 has a mirrored pinout compared to the TPA3221 and the other devices in the family.

Could you please confirm whether the datasheet is correct and the pin-to-pin compatibility indication is incorrect?

Thanks,

TAS6422-Q1: 200Hz Sin have Current noise, but 1kHz sin ok

yang yanliang — Wed, 11 Mar 2026 05:30:45 GMT

Part Number: TAS6422-Q1

200hz input:

We measured OUT+ using an oscilloscope and observed waveform distortion (waveform shown below). What could be the root cause? How should we troubleshoot this?

could it be related to software configuration or hardware design?"

TLV320AIC3254: AIC3254 PurePath miniDSP pass-through silent, while non-miniDSP works

Marten Kidd — Tue, 10 Mar 2026 13:42:16 GMT

Part Number: TLV320AIC3254

Hi,

I am debugging an AIC3254 with an FSC-BT1058 BT module as I2S master.
This is on my own custom board, I don't have access to any dev kit.

My goal is a local sidetone path:

IN1_L -> ADC -> miniDSP_A -> miniDSP_D -> DAC -> LOL/LOR

Current setup:

BT1058 I2S: master, 48 kHz, 24-bit
BT1058 provides MCLK, BCLK, WCLK
Codec currently uses BCLK = 2.304 MHz as PLL reference
Only one mic connected on IN1_L

What works:

Non-miniDSP version works on the same hardware
A2DP playback and HFP downlink work in miniDSP mode
ADC→DAC digital loopback works when I do not load the miniDSP image

What fails:

When I load/select the custom PurePath miniDSP image, I get no mic audio on LOL/LOR
I reduced the graph to a minimal pass-through, but it is still silent

What I already checked:

MICBIAS and analog input routing match the working non-miniDSP version
LOL/LOR are routed, powered, and unmuted
Custom miniDSP blocks are selected
miniDSP image appears to load correctly. I verified several high-page values by readback
My handwritten init now matches the exported SystemSettingsCode

My current conclusion:

Basic hardware and codec path seem OK
The issue appears tied to the custom miniDSP image and/or the miniDSP_A -> miniDSP_D handoff

Questions:

Is there any required AIC3254 configuration for a minimal IN1_L -> miniDSP_A -> miniDSP_D -> DAC -> LOL/LOR path that is easy to miss?
Are there any known requirements or limitations for miniDSP_A -> miniDSP_D pass-through in I²S slave mode with external BCLK/WCLK/MCLK?
Is there a known-good minimal AIC3254App8x4x example for single mic on IN1_L to LOL/LOR?
Anything else I'm missing?

Attached:

graph screenshot
codec_init() - codec_init.c
register/write transcript - transcript.txt

I also tried to upload the pfw and cfg files, but got an error.

Best regards,
Marten

CD4016B: CD4016B analog switch SPICE model request

Matias Bergerman — Tue, 10 Mar 2026 05:43:38 GMT

Part Number: CD4016B

Hello,

I would like to request a SPICE model for the CD4016B analog switch.

Thank you for your help!

TAS67524-Q1: about New EVM

kenji gemma — Tue, 10 Mar 2026 02:12:25 GMT

Part Number: TAS67524-Q1
Other Parts Discussed in Thread: TAS6754-Q1

Hello everyone on the team,

We have obtained a new evaluation board.

www.ti.com/.../TAS67524Q1EVM

www.ti.com/.../slvudm1.pdf

Is there any information required for this evaluation board besides the user manual?

Also, is information about a startup script specific to this evaluation board necessary?

Thank you for your cooperation,

Kenji Gemma

TPA2011D1: Impacted performance with gain higher than 2V/V.

FINN NIELSEN — Mon, 09 Mar 2026 15:04:07 GMT

Part Number: TPA2011D1

We are looking to implement a class amplifier in a client product and has found TPA2011D1 suited.

Datasheet however states that a gain of maximum 6dB (2V/V) is desireable for the best performance. What would be affected if using 6.7V/V gain?

TAD5242: Grounding and exposed thermal pad connection for TAD5242, TAD5142 and PCM1890

Ryu Yamashita — Mon, 09 Mar 2026 11:08:22 GMT

Part Number: TAD5242
Other Parts Discussed in Thread: TAD5142,

Hi team,

Questions:

TAD5242 / TAD5142
1-1. For TAD5242 and TAD5142, is the pin named “VSSA” intended to be connected to the analog ground (AGND)?
1-2. Is the pin named “VSS” intended to be connected to the digital ground (DGND)?
1-3. For the exposed thermal pad (if present on these devices), should it be tied to AGND, DGND, or board ground in general?
1-4. Are there any specific PCB layout recommendations regarding AGND/DGND partitioning and a single-point ground connection for these DACs?
PCM1890
2-1. For PCM1890, how should the exposed thermal pad be connected electrically?
- To analog ground (AGND)?
- To digital ground (DGND)?
- To board ground (common GND plane)?
- Any restrictions about connecting the pad to noisy digital ground

Best Regards,
Ryu.

TPA6130A2: Headphones give off very loud and distorted noises while plugging them in and out

Julius Merz — Mon, 09 Mar 2026 10:02:25 GMT

Part Number: TPA6130A2

Hello TI,

I made a minor change to an existing PCB to optimise the audio performance and lower power consumption. The main thing I did was replace a discrete amplifier made up of op-amps and transistors with the TPA6130A2RTJR.

I had a look at the "TPA6130A2EVM Schematic" while designing and noticed R11 and R13 in Figure 8 are 220R, but in the BOM they are 0R jumpers. I assumed 0R is correct , and the 220R is just a mistake.

I therefore didn't place any resistors in the output path from the amplifier to the jack, as I was keen on not limiting the maximum volume the 8 Ohm stereo headphone could deliver.
We chose this "SJ-3506-SMT-TR" headphone jack, but we didn't use the switches, as the headphone jack sits on a separate assembly and the wire connecting them doesn't allow for additional signals.

Now we are facing this issue: While music is playing, even at low volumes, when plugging in and out the headphones play back a very distorted and extremely loud noise.

I understand that the plug might get short-circuited by the jack on insertion, but I was expecting the advertised "Advanced Pop and Click Suppression Circuitry" to take care of exactly that issue.

Do you have any advice for me? Do I need to add current limiting resistors? If yes, what value resistor at the minimum? Does the "Advanced Pop and Click Suppression Circuitry" require those resistors to properly work?

Many thanks!

TAS2780: Hardware Protection Capability Support in TAS2780 AMP

Terry Hu — Mon, 09 Mar 2026 07:16:16 GMT

Part Number: TAS2780
Other Parts Discussed in Thread: TAS2781

Hi Team,

Could you please help to comment on the customer's questions below?

Do you know if TAS2780 AMP can support hardware protection capability? If yes, is there any sample code for our reference to develop?

Detail test requirement: including IV sensing, short/open circuit detection, thermal protection, and overcurrent protection — fault events are reported to the SoC via the IRQZ pin, enabling the SoC software layer to execute system-level protection actions (such as cutting speaker power), thereby forming a closed-loop protection mechanism of "hardware detection + software response".

Best regards,

Terry

TPA6120A2: THS6012 / TPA6120A2 Source Resistance

Jonah Strauss — Sun, 08 Mar 2026 20:53:00 GMT

Part Number: TPA6120A2
Other Parts Discussed in Thread: THS6012

I was looking at some of the subtleties of the TPA6120A2 by combing the THS6012 datasheet. I came across Figure 42, Source Resistance vs Noise Factor, which is delightfully confusing.

Why is ~150R the optimal Rs for THS6012, vs anything lower?

Is the optimal Rs for TPA6120A2 also ~150R?

That graph refers to the non-inverting input, correct?

Is there any advantage (in noise terms, not offset) to matching the source resistance of the inverting input to that of the non-inverting input? For instance, in a gain of 5, one might choose Rf=402R and Rg=100R for best balance of bandwidth and peaking. But with ~150R in series with the non-inverting input, one could choose Rf=806R and Rg=200R - if it did indeed provide a noise advantage.

Thanks!

LM5155-Q1: Request for Whisker Test Standard Information – BMW DCDC Gen Basis Project

Deepan Govindharaj Shanmugam — Sat, 07 Mar 2026 09:12:55 GMT

Part Number: LM5155-Q1

Dear Supplier,

Good day!

We are in the process of collecting information regarding the BMW DCDC Gen Basis Project

Kindly provide the details requested below, specifically the standard used for whisker testing and confirmation on whisker evaluation according to JESD201.

Please fill in the missing information in the table:

Manufacturer	Manufacturer Part Number	Flex Part Number	Item Description	Standard used for whisker test? [DIN EN 60068-2-82 or JESD22-A121A]	Evaluation of whiskers according to JESD201 [Yes/No]
TI	LM5155QDSSRQ1	FLX-BMW-ICS100152-01	IC Nonsynchronous Boost Flyba

TAC5112EVM-K: How to setting TAC5112EVM-K?

HU CHUN HSIANG — Sat, 07 Mar 2026 08:58:08 GMT

Part Number: TAC5112EVM-K

Hi,

I purchased a TAC5112EVM-K and am currently applying for the relevant software. Until I receive the software, I'm using PPC3's I2CMaster to send commands to the development board. Here are my configuration commands:

##### Record AC-Couple Differential IN1-IN2 path ######

# Target Mode, TDM, 32-bit

# Primary ASI only, multiple of 48KHz Sampling

#
wa0 00 00 #; Set page 0

wa0 01 01 #; Software reset

wa0 02 09 #; Wake up

#; Primary ASI

wa0 10 50 #; DOUT = PASI DOUT

wa0 11 80 #; Enable PASI DIN

wa0 19 00 #; 1 DIN / 1 DOUT

wa0 1a 70 #; PASI I2S, 32-bit

#; ADC TDM slot
w a0 1e 20 #; ADC Ch1 -> slot0
w a0 1f 30 #; ADC Ch2 -> slot1

#; DAC TDM slot
w a0 28 20 #; DIN Ch1 <- slot0
w a0 29 30 #; DIN Ch2 <- slot1

#; Differential AC-coupled input
w a0 50 00 #; ADC Ch1 diff, AC-coupled
w a0 55 00 #; ADC Ch2 diff, AC-coupled

#; Differential lineout
w a0 64 20 #; OUT1 differential from DAC1
w a0 65 20
w a0 66 20
w a0 6b 20 #; OUT2 differential from DAC2
w a0 6c 20
w a0 6d 20

#; Enable ADC + DAC

wa0 76 cc

wa0 78 e0

I'm using optical and analog mode.

Both BCK and FSYNC detect signals, but DOUT doesn't. Do I need to adjust my commands?

Then I can't read the signal. Is there a correct command for reading the signal?

DIX9211: Correct set-up and un-used pins?

Graham North1 — Fri, 06 Mar 2026 13:08:06 GMT

Part Number: DIX9211
Other Parts Discussed in Thread: PCM9211

Hi,

All I need to do with the DIX9211 is covert an I2S signal into an SPDIF. It's massivly overkill, but I can't find anyting else that will do it. Am I looking at using the correct part?

Should I be using RXIN 0 or RXIN 2 for the input? I'm not totally sure of the hardware differences between RXIN 0 & 1 and RXIN 3-7?

Does it matter which output I use? MPO 0 or MPO 1?

I already have a 24.576 MCLK clock on the board, can I use that to drive XTI?

Will INT0 & INT1 diectly drive LEDs? All the examples I've seen buffers are used.

I'll interface to it via I2C, so I know what to do with those pins.

I don't need any clock outputs, what should I do with SCKC, BCK, LRCK, DOUT?

What should I do with all other un-used pins?

I've read on the forum to look at the ADC9211 as the part is the same (minus the ADC) and the datasheet has been updated more recently.
I've found an error in that:
In the layout example, the filter network capacitors are connected to 3V3, not GND.

Regards,

INA1650: INA1650 - one channel damaged after 1-2months when connected with Eversolo DMP-A8

Mateusz Gawronski — Fri, 06 Mar 2026 08:00:53 GMT

Part Number: INA1650
Other Parts Discussed in Thread: TPS7A39, LM337, LM317

Hello,

I’ve run into the same issue in two separate cases. In both of them, one channel stopped working after about 1–2 months. In both setups, an Eversolo DMP-A8 was connected via XLR to the amplifier input board. These were two different DMP-A8 units, not the same one.

a) First case: two INA1650 devices used for one input, with an additional 1MΩ resistor on COM_A. Power supply: dual ±15V.

b) Second case: one INA1650 used for both channels. Power supply: dual ±12V. Here as well, one channel stopped working. After replacing the INA1650 with a new one, the same channel failed again.

Pin 1 of the XLR is connected either directly to PE (chassis) or to the chassis through 10 Ω + 100 nF as a lifted ground.

About the power supply:

For schematic a): linear power supply based on 7815/7915 with protection diodes.
For schematic b): two-stage linear power supply based on LM317 + LM337 with protection diodes, followed by a final stage using TPS7A39.

So it does not seem to matter whether the PSU is a classic linear design or a two-stage design using one of the best LDOs, the TPS7A39.

One additional piece of information that may be helpful: on the Eversolo, the right output of the DMP-A8 is always the one that fails. The left channel is fine.

Solution: replace the INA1650 and it works again for 3 weeks or more. What is the problem? The INA1650 has a lot of built-in protection, so is there something that is damaging one channel? On the damaged channel I can still hear sound, but the level is very, very low. The working channel can be heard from 2 meters away from the speaker, but with the damaged channel you need to put your ear right next to the speaker to hear something :)

TSC2007: Linux driver

Enhui Yang — Fri, 06 Mar 2026 07:52:31 GMT

Part Number: TSC2007
Other Parts Discussed in Thread: TSC2046

Hi team,

If we can provide TSC2007 and TSC2046 Linux driver code? Thanks.