Document
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. 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)
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Rev 0.2 -1-
2008/07
CONFIDENTIAL
[AK4201]
■ Block Diagram
Rf
AVDD
Regulator
Ci
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Ri
LIN
Amp
LOUT
VSS2
AK4201
Regulator
ROUT
Ci
Ri
RIN
Amp
PVDD
Charge Pump
PDN
VSS1 CP
CN
PVEE
Rf
Figure 1. AK4201 Block Diagram
Rev 0.2 -2-
2008/07
CONFIDENTIAL
[AK4201]
■ Ordering Guide
AK4201EU AKD4201 −40 ∼ +85°C 12pin USON (2.2mm x 2.9mm, 0.5mm pitch) Evaluation board for AK4201
■ Pin Layout
LIN
1
12
RIN
LOUT
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2
11
ROUT
AVDD
3
Top View
10
PVEE
VSS1
4
9
VSS2
PVDD
5
8
PDN
CN
6
7
CP
Rev 0.2 -3-
2008/07
CONFIDENTIAL
[AK4201]
PIN/FUNCTION
No. 1 2 3 4 5 6 7 8 Pin Name LIN LOUT AVDD VSS1 PVDD CN CP PDN I/O I O O O I 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
9 VSS2 10 PVEE O 11 ROUT O RIN I www.DataSheet4U.com 12 Note. PDN pin should not be floated.
■ Handling of Unused Pin
The unused I/O pins should be processed appropriately as below. Classification Analog Pin Name 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 -4-
2008/07
CONFIDENTIAL
[AK4201]
ABSOLUTE MAXIMUM RATING (VSS1=VSS2 =0V (Note 1)) Parameter Symbol min Power Supplies: Analog AVDD −0.3 (Note 2) Charge Pump PVDD −0.3 Input Curren.