Headphone Amp. AK4205 Datasheet

AK4205 Amp. Datasheet pdf. Equivalent

AK4205 Datasheet
Recommendation AK4205 Datasheet
Part AK4205
Description Ultra Low Noise and Distortion Headphone Amp
Feature AK4205; [AK4205] AK4205 Ultra Low Noise and Distortion Headphone Amp with Analog Switch 1. General Descripti.
Manufacture AKM
Datasheet
Download AK4205 Datasheet




AKM AK4205
[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 industrys 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
2. 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 85C
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)
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AKM AK4205
[AK4205]
3. Table of Contents
1. General Description............................................................................................................................. 1
2. Features............................................................................................................................................... 1
3. Table of Contents................................................................................................................................. 2
4. Block Diagram ..................................................................................................................................... 3
5. 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
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AKM AK4205
4. Block Diagram
[AK4205]
PVDDA PVEEA
DAC
Ach
NINA
PINA
AVSSA
RVDD
RVSS
DAC
Bch
NINB
PINB
AVSSB
700Ω
(typ)
74
(typ) LDO
700Ω
(typ)
74
(typ)
LDO
BG, VREF, IREF
700Ω
(typ)
74
(typ)
LDO
700Ω
(typ)
74
(typ)
LDO
SWVSS
SWVSS
Analog
Switch
HiFi
-3.3V Charge
Pump
+6.6V Charge
Pump
AUX
-3.3V Charge
Pump
BG
SWOUTA
Headphone
Ach
SWVDD
SWVSS
SWOUTB
Headphone
Bch
MUTEN
SEL
RSTN
PVEEB PVDDB
CAPSS
Figure 1. Block Diagram
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