SSM2335

更新时间： 2024-11-03 06:14:07

品牌	Logo	应用领域
亚德诺 - ADI		音频放大器
页数	文件大小	规格书
16页	584K
描述
Filterless, High Efficiency, Mono 3 W Class-D Audio Amplifier

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SSM2335 数据手册

Filterless, High Efficiency,

Mono 3 W Class-D Audio Amplifier

SSM2335

The SSM2335 features a high efficiency, low noise modulation

scheme that requires no external LC output filters. The modu-

lation continues to provide high efficiency even at low output

power. It operates with 93% efficiency at 1.4 W into 8 Ω or 85%

efficiency at 3 W into 3 Ω from a 5.0 V supply and has an SNR

of >96 dB. Spread-spectrum pulse density modulation is used

to provide lower EMI-radiated emissions compared with other

Class-D architectures.

FEATURES

Filterless Class-D amplifier with Σ-Δ modulation

No sync necessary when using multiple Class-D amplifiers

from Analog Devices, Inc.

3 W into 3 Ω load and 1.4 W into 8 Ω load at 5.0 V supply

with <1% total harmonic distortion (THD + N)

93% efficiency at 5.0 V, 1.4 W into 8 Ω speaker

>96 dB signal-to-noise ratio (SNR)

Single-supply operation from 2.5 V to 5.5 V

20 nA ultralow shutdown current

Short-circuit and thermal protection

Available in 9-ball, 1.5 mm × 1.5 mm WLCSP

Pop-and-click suppression

Built-in resistors reduce board component count

Default fixed 18 dB or user-adjustable gain setting

The SSM2335 has a micropower shutdown mode with a typical

shutdown current of 20 nA. Shutdown is enabled by applying

a logic low to the

pin.

The device also includes pop-and-click suppression circuitry.

This suppression circuitry minimizes voltage glitches at the

output during turn-on and turn-off, reducing audible noise

on activation and deactivation.

APPLICATIONS

Mobile phones

MP3 players

Portable gaming

Portable electronics

Educational toys

The fully differential input of the SSM2335 provides excellent

rejection of common-mode noise on the input. Input coupling

capacitors can be omitted if the input dc common-mode voltage

is approximately V_DD/2.

The default gain of the SSM2335 is 18 dB, but users can reduce the

gain by using a pair of external resistors (see the Gain section).

GENERAL DESCRIPTION

The SSM2335 is specified over the industrial temperature range

of −40°C to +85°C. It has built-in thermal shutdown and output

short-circuit protection. It is available in a 9-ball, 1.5 mm ×

1.5 mm wafer level chip scale package (WLCSP).

The SSM2335 is a fully integrated, high efficiency, Class-D audio

amplifier. It is designed to maximize performance for mobile

phone applications. The application circuit requires a minimum

of external components and operates from a single 2.5 V to 5.5 V

supply. It is capable of delivering 3 W of continuous output power

with <1% THD + N driving a 3 Ω load from a 5.0 V supply.

FUNCTIONAL BLOCK DIAGRAM

0.1µF

10µF

VBATT

2.5V TO 5.5V

VDD

SSM2335

160kΩ

47nF*

20kΩ

IN+

IN–

OUT–

OUT+

AUDIO IN+

AUDIO IN–

MODULATOR

FET

DRIVER

(Σ-Δ)

47nF*

160kΩ

INTERNAL

OSCILLATOR

POP-AND-CLICK

SUPPRESSION

BIAS

SHUTDOWN

GND

*INPUT CAPACITORS ARE OPTIONAL IF INPUT DC COMMON-MODE

VOLTAGE IS APPROXIMATELY V /2.

Figure 1.

Rev. 0

Information furnished by Analog Devices is believed to be accurate and reliable. However, no

responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other

rights of third parties that may result from its use. Specifications subject to change without notice. No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Trademarks and registeredtrademarks arethe property of their respective owners.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

Fax: 781.461.3113

www.analog.com

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