AK4205EN datasheet, PDF - EEWORLD Datasheet

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AK4205EN: DescriptionIC AMP AUDIO HIFI SWTCH; CategoryAnalog mixed-signal IC Consumption circuit; File Size894KB，25 Pages; ManufacturerAKM [Asahi Kasei Microsystems]

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AK4205EN Overview

IC AMP AUDIO HIFI SWTCH

AK4205EN Parametric

Parameter Name	Attribute value
Maker	AKM [Asahi Kasei Microsystems]
package instruction	,
Reach Compliance Code	unknown
Is Samacsys	N
Commercial integrated circuit types	AUDIO AMPLIFIER
Base Number Matches	1

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[AK4205]

AK4205

Ultra Low Noise and Distortion Headphone Amp with Analog Switch

1. General Description

The AK4205 is a stereo headphone amplifier corresponding to high resolution with built-in analog switch

for Hi-Fi mobile. The AK4205 achieves industry’s leading level ultra-low noise and ultra-low distortion

characteristics (THD+N = -118dB).

The AK4205 is available in a small 36-pin QFN package. It can save the mounting area of the board by

including resistors for gain adjustment and low-pass filter.

Application:



Smartphone



Portable AMP



Digital Media Player



USB DAC

Features

1. Headphone Amplifier



Full-differential Input



Built-in Resistors for Gain Adjustment: Fixed to +0.5 dB @1 kHz



2nd order Low-pass Filter



Ultra-Low Noise: S/N 124dB



Ultra-Low Distortion: THD+N -118 dB @32 Ω, 34 mW

THD+N -120 dB @600 Ω, 6.7 mW

2. Analog Switch



Selector Switch for Hi-Fi Audio path and Auxiliary path



Ultra-Low Distortion: THD -124dB@32 Ω, 34 mW



2 Vrms Output



Pop & Click Noise Free Switching Control



Built-in Negative Voltage Generator



Mute Function

3. Ta =

40 

85C

4. Power Supply:



Positive Power Supply (PVDDA, PVDDB): 6.0 V (typ)



Negative Power Supply (PVEEA, PVEEB): -5.0 V (typ)



Reference Power Supply (RVDD): 6.0 V (typ)



Analog Switch Power Supply (SWVDD): 3.3 V (typ)

5. Package:



36-pin QFN (5 x 5 mm, 0.4 mm pitch)

016012367-E-00

-1-

2016/12

[AK4205]

Table of Contents

General Description ............................................................................................................................. 1

Features............................................................................................................................................... 1

Table of Contents................................................................................................................................. 2

Block Diagram ..................................................................................................................................... 3

Pin Configurations and Functions ....................................................................................................... 4

■

Pin Configurations ............................................................................................................................. 4

■

Pin Functions..................................................................................................................................... 5

6. Absolute Maximum Ratings................................................................................................................. 6

7. Recommended Operating Conditions ................................................................................................. 7

8. Electrical Characteristics ..................................................................................................................... 8

■

Analog Characteristics ...................................................................................................................... 8

■

DC Characteristics ...........................................................................................................................11

■

Switching Characteristics .................................................................................................................11

■

Headphone-amp Power-up/down Timing ........................................................................................11

■

Timing Diagram ............................................................................................................................... 12

9. Functional Descriptions ..................................................................................................................... 13

9.1 System Reset ................................................................................................................................. 13

9.2 Charge Pump Circuit ...................................................................................................................... 13

9.3 Analog Switch & Mute Circuits ....................................................................................................... 14

9.4 Headphone Amplifier ...................................................................................................................... 15

9.5 Control Sequence ........................................................................................................................... 16

■

Analog Switch Power-up/down Sequence ...................................................................................... 16

■

Hi-Fi Mode

⇔

AUX Mode Pop Noiseless Change Sequence ...................................................... 18

10. Recommended External Circuits ................................................................................................... 19

10.1. General Example of External Circuit ........................................................................................... 19

10.2 Example of the connection with AK4492 ...................................................................................... 21

11.

Example of Layout ......................................................................................................................... 22

12. Package ......................................................................................................................................... 23

■

Outline Dimensions ......................................................................................................................... 23

■

Material & Lead finish ...................................................................................................................... 23

■

Marking ............................................................................................................................................ 23

13. Ordering Guide............................................................................................................................... 24

■

Ordering Guide ................................................................................................................................ 24

14. Revision History ............................................................................................................................. 24

IMPORTANT NOTICE

.............................................................................................................................. 25

016012367-E-00

-2-

2016/12

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