SSM2356CBZ-RL Analog Devices Inc, SSM2356CBZ-RL Datasheet

2x2W Filterless Class D Stereo Audio Amp

SSM2356CBZ-RL

Manufacturer Part Number

SSM2356CBZ-RL

Description

2x2W Filterless Class D Stereo Audio Amp

Manufacturer

Analog Devices Inc

Type

Class Dr

Datasheet

1.SSM2356CBZ-RL.pdf (16 pages)

Specifications of SSM2356CBZ-RL

Output Type

2-Channel (Stereo)

Max Output Power X Channels @ Load

2.5W x 2 @ 4 Ohm

Voltage - Supply

2.5 V ~ 5.5 V

Features

Depop, Differential Inputs, Short-Circuit and Thermal Protection, Shutdown

Mounting Type

Surface Mount

Package / Case

16-WLCSP

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

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FEATURES

Filterless stereo Class-D amplifier with Σ-Δ modulation

No sync necessary when using multiple Class-D amplifiers

2 × 2W into 4 Ω load and 2x1.4 W into 8 Ω load at 5.0 V

92% efficiency at 5.0 V, 1.4 W into 8 Ω speaker

>103 dB signal-to-noise ratio (SNR)

Single-supply operation from 2.5 V to 5.5 V

20 nA shutdown current; left/right channel control

Short-circuit and thermal protection

Available in a 16-ball, 1.66 mm × 1.66 mm WLCSP

Pop-and-click suppression

Built-in resistors that reduce board component count

User-selectable 6 dB or 18 dB gain setting

User-selectable ultralow EMI emission mode

APPLICATIONS

Mobile phones

MP3 players

Portable gaming

Portable electronics

GENERAL DESCRIPTION

The SSM2356 is a fully integrated, high efficiency, stereo 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 2 × 2W of contin-

uous output power with <1% THD + N driving a 4 Ω load from a

5.0 V supply.

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 registered trademarks are the property of their respective owners.

from Analog Devices, Inc.

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

SHUTDOWN–R

SHUTDOWN–L

RIGHT IN+

RIGHT IN–

INPUT CAPS ARE OPTIONAL IF INPUT DC COMMON-MODE

VOLTAGE IS APPROXIMATELY V

LEFT IN+

LEFT IN–

22nF

GAIN

INR+

INR–

SDNR

SDNL

INL+

INL–

SSM2356

FUNCTIONAL BLOCK DIAGRAM

80kΩ

GAIN

/2.

CONTROL

GAIN

GAIN = 6dB OR 18dB

10µF

Figure 1.

BIAS

MODULATOR

0.1µF

OSCILLATOR

(Σ-Δ)

INTERNAL

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

Tel: 781.329.4700

Fax: 781.461.3113

The SSM2356 features a high efficiency, low noise modulation

scheme that requires no external LC output filters. The modulation

continues to provide high efficiency even at low output power.

It operates with 92% efficiency at 1.4 W into 8 Ω or 85% efficiency

at 2.0 W into 4 Ω from a 5.0 V supply and has an SNR of >103 dB.

Spread-spectrum pulse density modulation is used to provide

lower EMI-radiated emissions compared with other Class-D

architectures. The SSM2356 includes an optional modulation

select pin (ultralow EMI emission mode) that significantly

reduces the radiated emissions at the Class-D outputs, particularly

above 100 MHz.

The SSM2356 has a micropower shutdown mode with a typical

shutdown current of 20 nA. Shutdown is enabled by applying

a logic low to the SDNR and SDNL pins. The device also

includes pop-and-click suppression circuitry that minimizes

voltage glitches at the output during turn-on and turn-off,

reducing audible noise on activation and deactivation.

The fully differential input of the SSM2356 provides excellent

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

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

is approximately V

selected between 6 dB and 18 dB with no external components

and no change to the input impedance. Gain can be further

reduced to a user-defined setting by inserting series external

resistors at the inputs.

The SSM2356 is specified over the commercial temperature range

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

short-circuit protection. It is available in a 16-ball, 1.66 mm ×

1.66 mm wafer level chip scale package (WLCSP).

VDD

GND

VDD

2 × 2W Filterless Class-D

DRIVER

CONTROL

FET

VBATT

2.5V TO 5.5V

GND

EDGE

Stereo Audio Amplifier

OUTR+

OUTR–

/2. The preset gain of SSM2356 can be

OUTL+

OUTL–

EDGE

EMISSION

CTRL

SSM2356

www.analog.com

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SSM2356CBZ-RL Summary of contents

Page 1

FEATURES Filterless stereo Class-D amplifier with Σ-Δ modulation No sync necessary when using multiple Class-D amplifiers from Analog Devices, Inc. 2 × 2W into 4 Ω load and 2x1.4 W into 8 Ω load at 5.0 V supply with <1% ...

Page 2

SSM2356 TABLE OF CONTENTS Features .............................................................................................. 1 Applications ....................................................................................... 1 General Description ......................................................................... 1 Functional Block Diagram .............................................................. 1 Revision History ............................................................................... 2 Specifications ..................................................................................... 3 Absolute Maximum Ratings ............................................................ 4 Thermal Resistance ...................................................................... 4 ESD Caution .................................................................................. 4 Pin ...

Page 3

SPECIFICATIONS 5 Ω +33 μH, EDGE = GND, Gain = 6 dB, unless otherwise noted Table 1. Parameter DEVICE CHARACTERISTICS Output Power/Channel Efficiency Total Harmonic Distortion ...

Page 4

SSM2356 ABSOLUTE MAXIMUM RATINGS Absolute maximum ratings apply at 25°C, unless otherwise noted. Table 2. Parameter Supply Voltage Input Voltage Common-Mode Input Voltage ESD Susceptibility Storage Temperature Range Operating Temperature Range Junction Temperature Range Lead Temperature Range (Soldering, 60 sec) ...

Page 5

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS Table 4. Pin Function Descriptions Bump Mnemonic Description A1 OUTL+ Noninverting Output for Left Channel. B1 OUTL− Inverting Output for Left Channel. C1 SDNL Shutdown, Left Channel. Active low digital input. D1 INL+ Noninverting Input ...

Page 6

SSM2356 TYPICAL PERFORMANCE CHARACTERISTICS 100 R = 8Ω + 33µH L GAIN = 6dB 0.1 0.01 0.001 0.0001 0.001 0.01 0.1 OUTPUT POWER (W) Figure 3. THD + N vs. Output Power into 8 ...

Page 7

GAIN = 6dB R = 4Ω + 15µ 0.1 0.01 1W 0.001 10 100 1k FREQUENCY (Hz) Figure 9. THD + N vs. Frequency ...

Page 8

SSM2356 100 V = 2.5V DD GAIN = 6dB R = 8Ω + 33µ 0.25W 0.1 0.0625W 0.01 0.125W 0.001 10 100 1k FREQUENCY (Hz) Figure 15. THD + N vs. Frequency 2 ...

Page 9

GAIN = 6dB 1 8Ω + 33µH L 1.6 1.4 1.2 10% 1.0 0.8 1% 0.6 0.4 0.2 0 2.5 3.0 3.5 4.0 SUPPLY VOLTAGE (V) Figure 21. Maximum Output Power vs. Supply Voltage, ...

Page 10

SSM2356 0.8 GAIN = 6dB R = 8Ω + 33µ FOR BOTH CHANNELS SY OUT 0 3.6V 0 2.5V DD 0.3 0.2 0 0.5 1.0 1.5 2.0 ...

Page 11

OUTPUT –1 SD INPUT –2 –110 –90 –70 –50 –30 – TIME (µs) Figure 33. Turn-Off Response 50 70 Rev Page SSM2356 ...

Page 12

SSM2356 TYPICAL APPLICATION CIRCUITS 22nF RIGHT AUDIO IN+ RIGHT AUDIO IN– 22nF SHUTDOWN–R SHUTDOWN–L 22nF LEFT AUDIO IN+ LEFT AUDIO IN– 22nF 22nF RIGHT AUDIO IN+ 22nF SHUTDOWN–R SHUTDOWN–L 22nF LEFT AUDIO IN+ 22nF 10µF 0.1µF VDD SSM2356 R 80kΩ ...

Page 13

APPLICATIONS INFORMATION OVERVIEW The SSM2356 stereo Class-D audio amplifier features a filterless modulation scheme that greatly reduces the external component count, conserving board space and, thus, reducing systems cost. The SSM2356 does not require an output filter but, instead, relies ...

Page 14

SSM2356 The measurements for Figure 36 and Figure 37 were taken in an FCC-certified EMI laboratory with a 1 kHz input signal, producing 0.5 W output power into an 8 Ω load from supply. Cable length was ...

Page 15

... OUTLINE DIMENSIONS 1.700 1.660 SQ 1.620 BALL A1 IDENTIFIER TOP VIEW (BALL SIDE DOWN) ORDERING GUIDE Model Temperature Range 1 SSM2356CBZ-REEL −40°C to +85°C 1 SSM2356CBZ-REEL7 −40°C to +85°C 1 EVAL-SSM2356Z RoHS Compliant Part. 0.660 0.600 0.540 SEATING PLANE 0.290 BSC 0.260 0.230 0.07 ...

Page 16

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