AK4201 Datasheet PDF - Asahi Kasei Microsystems

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AK4201
Asahi Kasei Microsystems

Part Number AK4201
Description Stereo Cap-less HP-Amp
Page 13 Pages


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CONFIDENTIAL
[AK4201]
= Preliminary =
AK4201
Stereo Cap-less HP-Amp
GENERAL DESCRIPTION
The AK4201 is an audio stereo cap-less headphone amplifier. The AK4201 eliminates the need for large
DC-blocking capacitors with a built-in Charge-pump circuit. The PSRR (Power supply Rejection Ratio)
can achieve to 100dB with a built-in regulator, and it can output 2Vrms with excellent linearity when used
as lineout amplifier. The AK4201 is available in tiny 12-pin USON (2.2 X 2.9mm), saving board space,
cost, and component height.
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FEATURE
† Stereo Cap-less Amplifier (No DC-blocking capacitors required)
† High PSRR (100dB at 217Hz)
† Output Power:
65 mW x 2ch @ 16Ω, AVDD=PVDD=5.0V, THD+N=-40dB
30 mW x 2ch @ 16Ω, AVDD=PVDD=3.3V, THD+N=-40dB
† Output Noise Level: 11µVrms (Ri=20kΩ, Rf=30kΩ)
† Line-Out level:
2.0Vrms @ 5kΩ, AVDD=PVDD=5.0V
2.0Vrms @ 5kΩ, AVDD=PVDD=3.3V
† Regulator built-in
† THD+N:
-60 dB @ 16Ω, 50mW, AVDD=PVDD=5.0V
-60 dB @ 16Ω, 20mW, AVDD=PVDD=3.3V
-90 dB @ 5kΩ, 2Vrms, AVDD=PVDD=5.0V
-90 dB @ 5kΩ, 2Vrms, AVDD=PVDD=3.3V
† Low Power Shutdown Mode
0.1µA (typ)
† Adjustable Gain Range:
-16 dB ~ 16dB
† Pop noise free at power-ON/OFF
† Power Supply: 2.6V ~ 3.6V or 4.5V ~ 5.5V
† Ta: 40 85°C
† Package: 12pin USON (2.2 x 2.9mm, 0.5mm pitch)
Rev 0.2
2008/07
-1-



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Block Diagram
AVDD
Ci Ri
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Ci
Ri
LIN
VSS2
RIN
PVDD
CONFIDENTIAL
Rf
Regulator
AK4201
Regulator
Amp
Amp
Charge
Pump
PDN
VSS1 CP CN
Rf
PVEE
Figure 1. AK4201 Block Diagram
[AK4201]
LOUT
ROUT
Rev 0.2
2008/07
-2-



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Ordering Guide
AK4201EU
AKD4201
Pin Layout
CONFIDENTIAL
[AK4201]
40 +85°C
12pin USON (2.2mm x 2.9mm, 0.5mm pitch)
Evaluation board for AK4201
www.DataSheet4U.com
LIN 1
LOUT 2
AVDD 3
VSS1 4
PVDD 5
CN 6
Top
View
12 RIN
11 ROUT
10 PVEE
9 VSS2
8 PDN
7 CP
Rev 0.2
2008/07
-3-



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CONFIDENTIAL
[AK4201]
No. Pin Name
1 LIN
2 LOUT
3 AVDD
4 VSS1
5 PVDD
6 CN
7 CP
I/O
I
O
-
-
-
O
O
8 PDN
I
9 VSS2
-
10 PVEE
O
11 ROUT
O
www.DataSheet4U.com 12
RIN
I
Note. PDN pin should not be floated.
PIN/FUNCTION
Function
L-channel analog input
L-channel analog output
Headphone positive power supply pin, 2.6V ~ 5.5V
Power ground
Charge-pump positive power supply pin, 2.6V ~ 5.5V
Negative charge-pump capacitor terminal pin
Positive charge-pump capacitor terminal pin
Power-down mode pin
“H”: Power-up, “L”: Power-down
Signal ground; connect to VSS1
Charge-pump circuit negative voltage output pin
R-channel analog output
R-channel analog input
Handling of Unused Pin
The unused I/O pins should be processed appropriately as below.
Classification Pin Name
Analog
LIN, RIN, LOUT, ROUT
Setting
Connect Output pin to Input pin when one channel
is used and the other is not used.
(Example) Connect the LOUT pin to the LIN pin if
Lch is not used.
Rev 0.2
2008/07
-4-



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