National Semiconductor LM49250 Скачать руководство пользователя страница 9 | Manualshive

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National Semiconductor LM49250 Скачать руководство пользователя страница 9

Revision History

Rev

Date

Description

1.0

03/09/10

Initial WEB released.

9

www.national.com

AN-1680

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Содержание LM49250

Страница 1: ...lows the user to easily evaluate the performance and characteris tics of the LM49250 device It provides connectors for audio inputs audio outputs I2C control power supply and shut down control Quick Start 1 Connect a shunt across the center pin I2C VDD and VDD pin of J9 I2CVDD VDD 2 Connect a shunt across the center RESET pin and the terminal of J4 I2C reset pin 3 Connect a 4Ω or 8Ω speaker across...

Страница 2: ...30029105 FIGURE 1 Evaluation Board Schematic www national com 2 AN 1680 ...

Страница 3: ...on J9 labeled GND If a separate I2C power supply is not used Connect the center I2CVDD to the pin on J9 labeled VDD J10 I2C signal terminals Pin 1 is for the SCL signal pin 2 is for the ADR signal pin 3 is for the SDA signal pin 4 is for I2C VDD and pin 5 is ground as labeled on the evaluation board J11 HP_R Right ground referenced headphone output terminal J12 HP_L Left ground referenced headphon...

Страница 4: ...e is cycled the interface must be reset to its default state Chip Power The Chip Power button enables or disables the entire device Even if an individual amplifier channel is enabled the device will not output any audio if the Chip Power button is set to OFF LDOH The LDOH button enables and disables the internal LDO The LDO is used to drive the ground referenced headphone am plifiers This allows t...

Страница 5: ...nnected to L1 and R2 Select L1 mix L2 and R1 mix R2 SINGLE ENDED STEREO PAIR to configure the device to accept two single ended stereo sources connected to both input pairs Volume Control and Gain Setting Each channel of the LM49250 has two separate gain stages Each input stage mono left and right features a 32 step vol ume control that can be configured through the INPUT VOL UME CONTROL section o...

Страница 6: ...Demonstration Board Layout 30029110 Top Silkscreen 30029109 Top Layer www national com 6 AN 1680 ...

Страница 7: ...30029107 Layer 2 30029108 Layer 3 7 www national com AN 1680 ...

Страница 8: ...30029106 Bottom Layer www national com 8 AN 1680 ...

Страница 9: ...Revision History Rev Date Description 1 0 03 09 10 Initial WEB released 9 www national com AN 1680 ...

Страница 10: ... EACH PRODUCT IS NOT NECESSARILY PERFORMED NATIONAL ASSUMES NO LIABILITY FOR APPLICATIONS ASSISTANCE OR BUYER PRODUCT DESIGN BUYERS ARE RESPONSIBLE FOR THEIR PRODUCTS AND APPLICATIONS USING NATIONAL COMPONENTS PRIOR TO USING OR DISTRIBUTING ANY PRODUCTS THAT INCLUDE NATIONAL COMPONENTS BUYERS SHOULD PROVIDE ADEQUATE DESIGN TESTING AND OPERATING SAFEGUARDS EXCEPT AS PROVIDED IN NATIONAL S TERMS AND...

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