MS6337_1 datasheet(15/20 Pages) MOSA

15 / 20 page

MOSA

MS6337

16-Bit Stereo Audio DAC & Mono 1.8W Power Amplifier

Plus Stereo Headphone Function

REV 2

15/20

www.mosanalog.com

APPLICATION INFORMATION

Basic application example

CAP

Supply

AVDD

AVSS

BCK

DATA

BTL+

LOUT/BTL-

ROUT

DAC

FORMAT

DAC SD

VDD

SD MODE

400K

RIN

LIN

HPIN

Mono / Stereo Mode

Switching Circuitry

Power Amplifier

Supply

PVDDL

PVDDR

PVSSL

MS6337

PVSSR

Click/Pop

Reduction

Bias

390K

DAC SD

Supply

DVDD

DGND

Decoder

0.1u

DVDD

AVDD

0.1u

390K

0.1u

MCU

AVDD

100u

8Ω

100u

Headphone Jack

100k

VDD

HP_sense

100k

CAPDC

Note:

VDAC out=0.015775*RF*VDD（Vpp）

RF//CF to decide –3dB point

For VDD=3V, RL=32, RF =24k, CF =390pF, VDAC out =1.134Vpp

_RL=16, RF =22k, CF =470pF, VDAC out =1.04Vpp

Fig.4 Basic application circuit.

SE mode and BTL mode operation

As shown in the block diagram (Page.1), for the SE mode, the MS6337 operates as a high drive dual operational

amplifiers.

Amplifier A1 and B1 are independent amplifiers with an externally configured gain of AV = - RF/RIN. Amplifier A2 is

shutdown to a high output impedance state. That is, the mono speaker is muted.

For the BTL mode, the audio signal from the RIN pin is connected directly to the inverting input of A1. As a result, the

L-IN and R-IN audio signals, either from DAC or Line in, are summed together at the input of A1. A2 is then activated

with a closed-loop gain of AV = -1 fixed by two internal resistors. The outputs of A1 and A2 are then used to drive the

mono bridged-tied load.

Also in the BTL mode, the amplifier B1 functions as an unit gain buffer. The output voltage of B1 will follow Vcap,

in which no current goes through the feedback resistor RF of B1. This will insure that as HPIN goes low there is no

transient of Rout for the BTL mode.

MS6337 Datasheet(PDF) 15 Page - MOSA ELECTRONICS

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