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TS4621B Datasheet(PDF) 2 Page - STMicroelectronics

Part # TS4621B
Description  High-performance class-G stereo headphone amplifier with I2C volume control
PDF  48 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TS4621B Datasheet(HTML) 2 Page - STMicroelectronics

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Contents
TS4621B
2/48
Doc ID 022194 Rev 2
Contents
1
Absolute maximum ratings and operating conditions . . . . . . . . . . . . . 6
2
Typical application schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4
Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
4.1
I2C bus interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
4.1.1
I²C bus operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
4.1.2
Control register CR1 - address 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
4.1.3
Control register CR2 - address 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
4.1.4
Control register CR3 - address 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
4.1.5
Summary of output impedance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
4.2
Wake-up and standby time definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
4.3
Overview of the class-G, 2-level headphone amplifier . . . . . . . . . . . . . . . 31
4.4
External component selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
4.4.1
Step-down inductor selection (L1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
4.4.2
Step-down output capacitor selection (Ct) . . . . . . . . . . . . . . . . . . . . . . . 33
4.4.3
Full capacitive inverter capacitors selection (C12 and Css) . . . . . . . . . 34
4.4.4
Power supply decoupling capacitor selection (Cs) . . . . . . . . . . . . . . . . . 34
4.4.5
Input coupling capacitor selection (Cin) . . . . . . . . . . . . . . . . . . . . . . . . . 34
4.4.6
Low-pass output filter (Rout and Cout) and
IEC 61000-4-2 ESD protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
4.4.7
Integrated input low-pass filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
4.5
Single-ended input configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
4.5.1
Layout recommendations for single-ended operation . . . . . . . . . . . . . . 38
4.6
Startup phase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
4.6.1
Auto zero technology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
4.6.2
Input impedance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
4.7
Layout recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
4.7.1
Common mode sense layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
4.8
Demonstration board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
5
Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44



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