LM4985TMX

更新时间： 2024-02-14 15:17:46

品牌	Logo	应用领域
美国国家半导体 - NSC		放大器
页数	文件大小	规格书
29页	1486K
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LM4985TMX 数据手册

May 2006

LM4985

Stereo 135mW Low Noise Headphone Amplifier with

Selectable Capacitively Coupled or Output

Capacitor-less (OCL) Output and Digitally Controlled

(I²C) Volume Control

General Description

Key Specifications (V_DD= 3.6V)

The LM4985 is a stereo audio power amplifier with internal

digitally controlled volume control. This amplifier is capable

of delivering 68mW_RMSper channel into a 16Ω load or

38mW_RMSper channel into a 32Ω load at 1% THD when

mode.

PSRR: 217Hz and 1kHz

Output Capacitor-less (OCL)

_RIPPLE= 217Hz

77dB (typ)

76dB (typ)

_RIPPLE= 1kHz

Capacitor Coupled (C-CUPL)

Boomer audio power amplifiers were designed specifically to

provide high quality output power with a minimal amount of

external components. To that end, the LM4985 features two

functions that optimize system cost and minimize PCB area:

an integrated, digitally controlled (I²C bus) volume control

and an operational mode that eliminates output signal cou-

pling capacitors (OCL mode). Since the LM4985 does not

require bootstrap capacitors, snubber networks, or output

coupling capacitors, it is optimally suited for low-power, bat-

tery powered portable systems. For added design flexibility,

the LM4985 can also be configured for single-ended capaci-

tively coupled outputs.

_RIPPLE= 217Hz

_RIPPLE= 1kHz

63dB (typ)

62dB (typ)

Output Power per channel

(f_IN= 1kHz, THD+N = 1%),

R_L= 16Ω,OCL

V_DD= 2.5V

31mW (typ)

68mW (typ)

135mW (typ)

V_DD= 3.6V

V_DD= 5.0V

THD+N (f = 1kHz)

R_LOAD= 16Ω, OCL, P_OUT= 60mW

R_LOAD= 32Ω, OCL, P_OUT= 33mW

Shutdown Current

0.60

0.031

The LM4985 features a current shutdown mode for mi-

cropower dissipation and thermal shutdown protection.

0.1µA (typ)

Features

n OCL or capacitively coupled outputs (patent pending)

n I²C Digitally Controlled Volume Control

n Available in space-saving 0.4mm lead-pitch micro SMD

package

n Volume control range: –76dB to +18dB

n Ultra low current shutdown mode

n 2.3V - 5.5V operation

n Ultra low noise

Applications

n Mobile Phones

n PDAs

n Portable electronics devices

n MP3 Players

Boomer^®is a registered trademark of National Semiconductor Corporation.

DS201697

www.national.com

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