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Richtek

RT9114B Audio Evaluation Board

EVB_RT9114BGQV

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The RT9114B is an I2S device receiving all clocks from external sources. It can support both master and slave mode with wide input sampling rate from 8kHz to 96kHz. The RT9114B operates with a PWM switching frequency of 352kHz or 384kHz, depending on the input sampling rate. A fully programmable data path routes these channels to the internal speaker drivers.

Purpose

The RT9114B is a high efficiency, I2S-input, stereo channel audio power amplifier which delivering 2x18W into 8 ohm BTL speaker loads. It can deliver over 90% power efficiency and eliminate the need for heat-sink. This document explains the function and usage of the RT9114BGQV evaluation board (EVB), and provides information for power-up operation, and the modification of the evaluation board and the circuit, to be suitable for individual requirements.


Introduction

General Product Information

The RT9114B is an I2S device receiving all clocks from external sources. It can support both master and slave mode with wide input sampling rate from 8kHz to 96kHz. The RT9114B operates with a PWM switching frequency of 352kHz or 384kHz, depending on the input sampling rate. A fully programmable data path routes these channels to the internal speaker drivers.

The RT9114B features three band DRC and flexible multi-band biquads for anti-clipping, power limiting, and speaker equalization.



Product Feature

  • 8V to 2.4V Input Voltage Range
  • 2x18W at 10% THD+N into 8Ω BTL at 18V
  • 2x9W at 10% THD+N into 8Ω BTL at 12V
  • Support Stereo Channels Output
  • Sampling Frequency from 8kHz to 96kHz
  • Built-in Anti-Pop Function for BTL BD Modulations
  • > 24 Programmable Biquads for Speaker Equalization
  • Programmable Coefficients for DRC Filters
  • Supporting Multi-Compression Ratios
  • Built-in DC Blocking Filters
  • Protection Features : UVLO, OVP, OCP, DCP and OTP
  • VQFN-28L Thermally-Enhanced Package

Key Performance Summary Table

Key Features

Evaluation Board Number : RT9114B_Q4X5_28L_V0

Default Input Voltage

12V

RMS Output Power, THD + N = 10%, 8Ω Load, (BTL)

9W

RMS Output Power, THD + N = 1%, 8Ω Load, (BTL)

6.5W

Total Harmonic Distortion+Noise, PO = 1W, 8ΩLoad, (BTL)

0.03%

OCP Threshold

6.3A



Bench Test Setup Conditions

Headers Description and Placement

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Carefully inspect all the components used in the EVB according to the following Bill of Materials table, and then make sure all the components are undamaged and correctly installed. If there is any missing or damaged component, which may have occurred during transportation, please contact our distributors or e-mail us at evb_service@richtek.com.



Test Points

The EVB is provided with the test points and pin names listed in the table below.

Test point /

Pin name

Signal

Comment (expected waveforms or voltage levels on test points)

PVDD

Input Voltage

Power input. Support 8V to 26.4V input voltage.

3.3V

Enable Test Point

Power input. Support 3V to 3.6V input voltage.

PVSS

Ground

Ground.

OUT_PL, OUT_NL

Speaker Differential Output Left Channel

Connect speaker or dumy load.

OUT_NR, OUT_PR

Speaker Differential Output Right Channel

Connect speaker or dumy load.

SCL, SDA

I2C Signal

Connect I2C signal.

BCK, LRCK, DOUT

I2S Signal

Connect I2S signal.

FAULT

FAULT Behaviour

It will pull low when protection behavior is happened.



Power-up & Measurement Procedure

1. The 1X3 Header (JP4) is the RESETB. (JP4 setting : Short PIN1;2 = Disable, Short PIN2;3 = Enable).

2. The 1X3 Header (JP7) is the PWDNB. (JP7 setting : Short PIN1;2 = Disable, Short PIN2;3 = Enable).

3. The 1X3 Header (JP8) is the FAULTB.

4. The 1X3 Header (JP9) is the A_SEL. (JP9 setting : Short PIN1;2 = 1A, Short PIN2;3 = 1B) and see A_SEL setting as Table 1.

A_SEL

Addr

0

1A

1

1B

Table 1. A_SEL Setting


5. Apply 8Ω speakers to the speaker connection (GP5 (OUT_PL), GP6 (OUT_NL), GP7 (OUT_NR), and GP8 (OUT_PR).

6. Apply I2S digital audio signals to JP2 (PIN2 = MCLK (Option), PIN4 = LRCK, PIN6 = SCLK, PIN8 = SDI, PIN10 = SDO).

7. Connect the GND, SCL, SDA wires from Wrenboard to J2 (PIN1 = PVSS, PIN3 = SCL, PIN5 = SDA). Then connect the Richtek Wrenboard to the PC. Apply Wrenboard with 3.3V configuration and please refer to Wrenboard User Manual for the installation and operation. Please note you’ll need the RICHTEK Wrenboard I2C interface for controlling the RT9114B EVB.

8. Apply an input power supply (8V < PVCC < 26.4V) to the PVDD and PVSS (GND) pins respectively.

9. Apply an input power supply (3.3V) to the DVDD and PVSS (GND) pins respectively.

10. Turn on the power.

11. Apply the initial sequence. Please refer to RT9114B GUI User Manual to operate the GUI tool.


Technical Document Image Preview

Figure 1. The connection of RT9114B, Wrenboard, and PC



Schematic, Bill of Materials & Board Layout

EVB Schematic Diagram

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Bill of Materials

Reference

Qty

Part Number

Description

Package

Manufacturer

U1

1

RT9114BGQV

15W Stereo Audio Amplifier

VQFN-28L 4x5

Richtek

C1, C3, C7, C11, C13, C16, C21, C22

8

C1608X7R1H474K080AC

470nF/50V

0603

TDK

C4, C12, C20, C25

4

0603B391K500CT

390pF/50V

0603

WALSIN

C8, C14, CB3, CB6, CT2

5

C1608X7R1H104K080AA

100nF/50V

0603

TDK

C9, C15, C23

3

C1608X5R1E105K080AC

1µF/25V

0603

TDK

CB1, CB5, CT3, CT4, CT10, CT11

6

10µF/50V

1210

muRata

CB4, CB7, CT1, CT8

4

0603B102K500CT

1nF/50V

0603

WALSIN

CT9

1

0603N101J500CT

100pF/50V

0603

WALSIN

CT15

1

C3216X5R1H106K160AB

10µF/50V

1206

TDK

L2, L4, L6, L8

4

NR8040T100M

10µH

TAIYO YUDEN



PCB Layout

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Top View

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Bottom View

Title Last Update Share Download
Evaluation Board User Guide 2019/07/03
Bill of Materials 2019/07/03
RT911X_GUITools_RT9114B 2019/07/03
RT9114B GUI User Manual 2019/07/03
RT9114B

具有EQ和DRC控制的双通道数字音频系统

RT9114B

RT9114B是一款高效率的I2S输入、立体声音讯功率放大器,可带动2x20W的8Ω BTL扬声器,具有高达 90%以上的电能利用效率,无需使用散热片。
它内建能在各种条件下消除扬声器爆裂音的防爆功能,具有过热保护、过流保护、欠压保护和错误状态报告功能。
它是一款完全使用外来时钟信号的I2S设备,可工作于主机模式和从机模式,可接受8kHz至96kHz的信号采样率,具有完全可程控的数据路由功能可将外来信息路由至内部扬声器驱动电路。
RT9114B含有三段式DRC和灵活的多段式双二阶滤波器,可实现防削顶、功率限制和扬声器均衡处理。

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