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Middle Power Class-D Speaker Amplifiers

Class-D Speaker Amplifier

for Digital Input with Built-in DSP

BM5446EFV

No.10075EBT13

●Description

BM5446EFV is a Class D Speaker Amplifier with built-in DSP (Digital Sound Processor) designed for Flat-panel TVs in

particular for space-saving and low-power consumption, delivers an output power of 20W+20W. This IC employs

state-of-the-art Bipolar, CMOS, and DMOS (BCD) process technology that eliminates turn-on resistance in the output power

stage and internal loss due to line resistances up to an ultimate level. With this technology, the IC can achieve high

efficiency of 86% (10W+10W output with 8Ω load). In addition, the IC is packaged in a compact reverse heat radiation type

power package to achieve low power consumption and low heat generation and eliminates necessity of external heat-sink

up to a total output power of 40W. This product satisfies both needs for drastic downsizing, low-profile structures and many

function, high quality playback of sound system.

●Features

1) This IC includes the DSP (digital sound processor) for Audio signal processing for Flat TVs.

2) This IC has two input systems of digital audio interface.

2

(I S/LJ/RJ format, LRCLK: 32 kHz/ 44.1kHz / 48kHz, SYS_CLK: 256fs / 512fs,

BCLK: 48fs / 64fs, SDATA: 16 / 20 / 24bit)

3) With wide range of power supply voltage, it is possible to operate with single power supply. (Vcc = 10~26V)

4) With high efficiency and low heat dissipation contributing to miniaturization, slim design, and also power saving of the

system.

5) S/N of the system can be optimized by adjusting the gain selection in 16 steps. (20~35dB,1dB/step)

6) With built-in feedback circuitry at the output, prevents the decrease in sound quality due to change in power supply

voltage. In addition, low noise and low distortion are achieved.

7) With a built-in DAC provides best stereo-output for headphone function. As a result, the selection of output of the

digital input in two systems is possible.

8) It has additional S/PDIF output for the LINE output usage.

9) Eliminates pop-noise generated during the power supply on/off. High quality muting performance is realized by using

the soft-muting technology.

10) This IC is built-in with various protection functions for highly reliability design.

(High temperature protection, Under voltage protection, Output short protection, Output DC-Voltage protection and

Clock stop protection).

●Applications

Flat Panel TVs (LCD, Plasma), Home Audio, Desktop PC, Amusement equipments, Electronic Music equipments, etc.

www.rohm.com

1/32

2010.05 - Rev.B

BM5446EFV

●Absolute

maximum ratings

(Ta=25℃)

Parameter

Supply voltage

Symbol

V

CC

Ratings

30

2.0

Power dissipation

Pd

4.5

6.2

Input voltage

Open-drain terminal voltage

Operating temperature range

Storage temperature range

Maximum junction temperature

V

IN

V

ERR

Topr

Tstg

Tjmax

-0.3 ~ 4.5

-0.3 ~ 30

-25 ~ +85

-55 ~ +150

+150

Unit

V

W

V

℃

Technical Note

Conditions

Pin 27, 30, 31, 51, 52

*3

*4

*5

Pin 5 ~ 14, 22

Pin 26

*1

*1*2

*1 The voltage that can be applied reference to GND (Pin 4, 36, 37, 45, 46) and VSS (Pin 15, 20).

*2 Do not, however exceed Pd and Tjmax=150℃.

*3 70mm×70mm×1.6mm, FR4, 1-layer glass epoxy board (Copper on bottom layer 0%)

Derating in done at 16mW/℃ for operating above Ta=25℃.

*4 70mm×70mm×1.6mm, FR4, 2-layer glass epoxy board (Copper on bottom layer 100%)

Derating in done at 36mW/℃ for operating above Ta=25℃. There are thermal via on the board.

*5 70mm×70mm×1.6mm, FR4, 4-layer glass epoxy board (Copper on bottom layer 100%)

Derating in done at 49.6mW/℃ for operating above Ta=25℃. There are thermal via on the board.

●Operating

conditions

(Ta=25℃)

Parameter

Supply voltage

Minimum load impedance

(Speaker Output)

Minimum load impedance

(DAC Output)

*6 Do not, however exceed Pd.

* No radiation-proof design.

Symbol

V

CC

R

L_SP

R

L_DA

Ratings

10 ~ 26

5.4

20

Unit

V

Ω

kΩ

Conditions

Pin 27, 30, 31, 51, 52

*6

Pin 24, 25

*1 *2

www.rohm.com

2/32

2010.05 - Rev.B

BM5446EFV

Technical Note

●Electrical

characteristics

(Unless otherwise specified Ta=25℃,Vcc=13V,f=1kHz,R

L_SP

=8Ω,R

L_DA

=20kΩ,RESETX=3.3V,MUTEX=3.3V,PDX=3.3V,

Gain=20dB, DSP: Through, fs =48kHz)

Limits

Parameter

Symbol

Unit

Conditions

Min.

Typ.

Max.

Total circuit

Circuit current

(Power down mode)

Open-drain terminal

Low level voltage

Regulator output voltage 1

Regulator output voltage 2

Regulator output voltage 3

High level input voltage

Low level input voltage

Input current

(Input pull-up terminal)

Input current

(Input pull-down terminal)

Input current

(SCL, SDA terminal)

Output current

(SCL, SDA terminal)

High level output voltage

(S/PDIF output terminal)

Low level output voltage

(S/PDIF output terminal)

Speaker Output

Maximum momentary

output power 1

Maximum momentary

output power 2

Total harmonic distortion

Crosstalk

Output noise voltage

(Sampling mode)

Residual noise voltage

(Mute mode)

P

O1

P

O2

THD

SP

CT

SP

V

NO_SP

V

NOR_SP

f

PWM1

PWM sampling frequency

f

PWM2

f

PWM3

DAC Output

Maximum output voltage

Channel Balance

Total harmonic distortion

Crosstalk

Output noise voltage

Residual noise voltage

V

OMAX

CB

THD

DA

CT

DA

V

NO_DA

V

NOR_DA

0.85

-1

-

65

-

1.0

0

0.05

80

10

3

-

1

0.5

-

20

10

Vrms

dB

%

dB

µVrms

0dBFS,THD+n=1%

0dBFS

-20dBFS,BW=20½20kHz

0dBFS,BW=IHF-A

-∞dBFS,BW=IHF-A

MUTEX=0V,PDX=0V,

-∞dBFS,BW=IHF-A

-

65

-

10

20

0.07

80

140

5

512

705.6

768

-

280

10

-

W

%

dB

µVrms

kHz

THD+n=10%,Gain=26dB

Vcc=18V,THD+n=10%,Gain=26d

B

P

O

=1W,BW=20½20kHz

P

O

=1W,BW=IHF-A

-∞dBFS,BW=IHF-A

MUTEX=0V,-∞dBFS,BW=IHF-A

fs=32kHz

fs=44.1kHz

fs=48kHz

*7

I

CC1

I

CC2

V

ERR

V

REG_G

V

REG_3

V

REG_15

V

IH

V

IL

I

IL

I

IH

I

O

V

OH

V

OL

-

5.0

3.0

1.3

2.5

0

50

30

-

-1

2.75

-

60

2.5

-

5.5

3.3

1.5

-

100

70

0

3.3

0

120

5

0.8

6.0

3.6

1.7

3.3

0.8

150

105

1

-

0.55

mA

V

µA

V

Pin 27, 30, 31, 51, 52,No load

RESETX=0V, MUTEX=0V,PDX=0V

Pin 26,I

O

=0.5mA

Pin 28, 54

Pin 3

Pin 16

Pin 5 ~ 14, 22

Pin 5 ~ 9,VIN = 0V

Pin 10 ~ 12, 22,VIN = 3.3V

Pin 13, 14,VIN = 3.3V

Pin 13, 14,VIN = 0V

Pin 23,I

O

=-0.6mA

Pin 23,I

O

= 0.6mA

*7 These items show the typical performance of device and depend on board layout, parts, and power supply.

The standard value is in mounting device and parts on surface of ROHM’s board directly.

www.rohm.com

3/32

2010.05 - Rev.B

BM5446EFV

●DSP

Block Functional Overview

1) Main Signal line function

No.

Function

1

2

3

Pre-scalar

DC cut HPF

Channel Mixer

½Lch

/ Rch synchronous control

½+24

~ -103dB (0.5dB step),-∞dB

½FC

: 1Hz

Technical Note

Specification

4

P

2

Volume

(Perfect Pure Volume)

½Mixing

of the sound of the left and right channel of the input digital signal to DSP is

set up.

½There

are some scenes when sound becomes large suddenly, like the

explosion-scene

in TV commercial or in an action movie. The “P2Volume” function controls volume

automatically and adjusts the output level.

½It

makes easy to hear small whisper voice, and is adjusted.

½Attack

time : 1ms ~ 40ms (8steps)

½Recovery

time : 0.25s ~ 10s (16 steps)

½Peaking

filter is used.

½Lch

/ Rch Concurrent control

½Soft

transition function

½Fc

Select : Same as 7 Band Parametric

Equalizer

½Gain

Select : ±18dB (0.5dB step)

½Q

(Quality Factor) : Same as 7 Band

Parametric Equalizer

½Low

shelf filter is used.

½Lch

/ Rch Concurrent control

½Soft

transition function

½Fc

Select : Same as 7 Band Parametric

Equalizer

½Gain

Select : ±18dB (0.5dB step)

½Q

(Quality Factor) : Same as 7 Band

Parametric Equalizer

5

BASS

6

MIDDLE

½Peaking

filter is used.

½Lch

/ Rch Concurrent control

½Soft

transition function

½Fc

Select : Same as 7 Band Parametric Equalizer

½Gain

Select : ±18dB (0.5dB step)

½Q

(Quality Factor) : Same as 7 Band Parametric Equalizer

½Peaking

filter is used.

½Lch

/ Rch Concurrent control

½Soft

transition function

½Fc

Select : Same as 7 Band Parametric

Equalizer

½Gain

Select : ±18dB (0.5dB step)

½Q

(Quality Factor) : Same as 7 Band

Parametric Equalizer

½High

shelf filter is used.

½Lch

/ Rch Concurrent control

½Soft

transition function

½Fc

Select : Same as 7 Band Parametric

Equalizer

½Gain

Select : ±18dB (0.5dB step)

½Q

(Quality Factor) : Same as 7 Band

Parametric Equalizer

7

TREBLE

8

9

Scalar 1

Pseudo Stereo

10

Matrix Surround 3D

11

P Bass

(Perfect Pure Bass)

2

½Lch

/ Rch Concurrent control

½

+24 ~ -103dB (0.5dB step), -∞dB

½A

stereo-feel sound is reproduced for a monophonic sound by signal processing.

½3

steps : Pseudo Stereo OFF / Pseudo Stereo ON (Weak) / Pseudo Stereo ON

(Strong)

½Matrix

Surround 3D of a wider sweet spot, and it also with little prolonged viewing

and listening with a feeling of fatigue.

½The

acoustic field which does not spoil a vocal feeling of the normal position is played

back.

½Surround

: ON / OFF function

½Loop

: ON / OFF function

½Surround

gain select : 16 steps

½Clear

deep Bass with low distortion.

½Lch

/ Rch Concurrent control

½Soft

transition function

½Frequency

select : 4 steps

½Gain

select : 0 ~ 15dB (1dB step)

½Real,

pure and crystal clear sound.

½Lch

/ Rch Concurrent control

½Soft

transition function

½Gain

select : 0 ~ 15dB (1dB step)

½Lch

/ Rch Concurrent control

½+24

~ -103dB (0.5dB step), -

∞dB

12

P Treble

(Perfect Pure Treble)

2

13

Scalar 2

www.rohm.com

4/32

2010.05 - Rev.B

BM5446EFV

Technical Note

No.

Function

Specification

½Peaking

filter is used. (Possible to set the 5 coefficients directly for b0,b1,b2,a1,a2)

½Lch

/ Rch Concurrent control

½Fc

select : Setup of 61 divisions (20Hz ~ 20kHz) is possible.

½Gain

select : ±18dB ( 0.5dB step )

½Q(Quality

Factor) : 0.33, 0.43, 0.56, 0.75, 1.0, 1.2, 1.5, 1.8, 2.2, 2.7, 3.3, 3.9, 4.7,

5.6, 6.8, 8.2

½+24

~ -103dB ( 0.5dB step ), -∞dB

½Soft

transition and soft mute function

½Lch

/ Rch Concurrent control, Sub-Woofer ch Independent control

½It

decreases by 1dB step from a volume setting value.

( Lch/Rch : 0dB/-∞dB, 0dB/-126dB, 0dB/-125dB,

½½½½½,

0dB/0dB,

½½½½½,

-125dB/0dB, -126dB/0dB, -∞dB/0dB )

½Lch

/ Rch Concurrent control, Sub-Woofer ch Independent control

½+24

~ -103dB (0.5dB step), -∞dB

½A

clip with an arbitrary output amplitude is possible.

½Lch

/ Rch Concurrent control, Sub-Woofer ch Independent control

14

7-Band

Parametric Equalizer

15

Volume

16

Balance

17

18

Post-scaler

Output Clipper

2) Sub Signal line function

No.

Function

19

Channel Mixer

20

21

LPF

3-Band

Parametric Equalizer

Volume

Specification

½Mixing

of the sound of the left and right channel of the input digital signal to DSP is

set up.

½Lch

(Lch is input, (Lch+Rch)/2 is input, Rch is input), Rch (Rch is input, (Lch+Rch)/2

is input, Lch is input)

½LPF

for Sub-Woofer

½Fc=

60Hz, 80Hz, 100Hz, 120Hz, 160Hz, 200Hz, 240Hz, 280Hz

½Peaking

or low shelf or high shelf filter is used.

½Lch

/ Rch Concurrent control

½+24

~ -103dB ( 0.5dB step ), -∞dB

½Soft

transition and soft mute function

½

Lch / Rch Concurrent control, Sub-Woofer ch Independent control

½It

decreases by 1dB step from a volume setting value.

( Lch/Rch : 0dB/-∞dB, 0dB/-126dB, 0dB/-125dB,

½½½½½,

0dB/0dB,

½½½½½,

-125dB/0dB, -126dB/0dB, -∞dB/0dB )

½Lch

/ Rch Concurrent control, Sub-Woofer ch Independent control.

½+24

~ -103dB (0.5dB step), -∞dB

½A

clip with an arbitrary output amplitude is possible.

½Lch

/ Rch Concurrent control, Sub-Woofer ch Independent control.

22

23

Balance

24

25

Post-scaler

Output Clipper

SEL1

SDATA1

Pre

Scalar

DC Cut

HPF

Channel

Mixer

BASS

MIDDLE

TREBLE

Scalar

1

Surround

Scalar

2

7 Band

Parametric

Equalizer

EVR

＆

Balance

Post

Scalar

&

Clipper

Post

Scalar

&

Clipper

SEL2

SDATAO1

SPEAKER

OUTPUT

SDATA2

Channel

Mixer

LPF

3 Band

Parametric

Equalizer

EVR

＆

Balance

SDATAO2

Digital Audio Processing Signal Flow

SEL3

DAC

DSP Block diagram

S/PDIF

OUTPUT

ANALOG

OUTPUT

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5/32

2010.05 - Rev.B

BM5446EFV_10

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