PT2257-SL 데이터 시트보기 (PDF) - Princeton Technology

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PT2257-SL

Electronic Volume Controller IC

Princeton Technology 

Electronic Volume Controller IC

DATA BYTES DESCRIPTION

FUNCTION BITS

MSB 2 3 4 5 6 7 LSB

1

111 1 1 1

1

1

1 0 1 A3 A2 A1 A0

1

1 1 0 0 B2 B1 B0

1

0 1 0 A3 A2 A1 A0

1

0 1 1 0 B2 B1 B0

0

0 1 0 A3 A2 A1 A0

0

0 1 1 0 B2 B1 B0

0

111 1 0 0

M

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Fax: 886-2-29174598

URL: http://www.princeton.com.tw

PT2257

Function

Function OFF (-79dB)

2-Channel, -1dB/step

2-Channel, -10dB/step

Left Channel, -1dB/step

Left Channel, -10dB/step

Right Channel, -1dB/step

Right Channel, -10dB/step

2-Channel, MUTE

When M=1, MUTE=ON

When M=0, MUTE=OFF

ATTENUATION UNIT BIT

A3

A2/B2

A1/B1

0

0

0

0

0

0

0

0

1

0

0

1

0

1

0

0

1

0

0

1

1

0

1

1

1

0

0

1

0

0

A0/B0

0

1

0

1

0

1

0

1

0

1

Attenuation Value (dB)

0/0

-1/-10

-2/-20

-3/-30

-4/-40

-5/-50

-6/-60

-7/-70

-8/

-9/

Where: Ax=-dB/step, Bx=-10dB/step

For example, for a Left Channel Attenuation at -33dB, the data byte is as follows:

START 1 0 1 1 0 0 1 1 ACK 1 0 1 0 0 0 1 1 ACK STOP

Left Channel -30dB

Left Channel -3dB

PT2257 V1.3

-8-

December, 2006

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