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PDF BM5446EFV Data sheet ( Hoja de datos )
| Número de pieza | BM5446EFV | |
| Descripción | Class-D Speaker Amplifier | |
| Fabricantes | ROHM Semiconductor | |
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www.DataSheet4U.com
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.
(I2S/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
© 2010 ROHM Co., Ltd. All rights reserved.
1/32
2010.05 - Rev.B
1 page  
BM5446EFV
Technical Note
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No. Function
14
7-Band
Parametric Equalizer
15 Volume
16 Balance
17 Post-scaler
18 Output Clipper
Specification
･Peaking filter is used. (Possible to set the 5 coefficients directly for b0,b1,b2,a1,a2)
･Lch / Rch Concurrent control
･Fc select : Setup of 61 divisions (20Hz ~ 20kHz) is possible.
･Gain select : ±18dB ( 0.5dB step )
･Q(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
･+24 ~ -103dB ( 0.5dB step ), -∞dB
･Soft transition and soft mute function
･Lch / Rch Concurrent control, Sub-Woofer ch Independent control
･It decreases by 1dB step from a volume setting value.
( Lch/Rch : 0dB/-∞dB, 0dB/-126dB, 0dB/-125dB, ･････, 0dB/0dB, ･････,
-125dB/0dB, -126dB/0dB, -∞dB/0dB )
･Lch / Rch Concurrent control, Sub-Woofer ch Independent control
･+24 ~ -103dB (0.5dB step), -∞dB
･A clip with an arbitrary output amplitude is possible.
･Lch / Rch Concurrent control, Sub-Woofer ch Independent control
2) Sub Signal line function
No. Function
19 Channel Mixer
20 LPF
21
3-Band
Parametric Equalizer
22 Volume
23 Balance
24 Post-scaler
25 Output Clipper
Specification
･Mixing of the sound of the left and right channel of the input digital signal to DSP is
set up.
･Lch (Lch is input, (Lch+Rch)/2 is input, Rch is input), Rch (Rch is input, (Lch+Rch)/2
is input, Lch is input)
･LPF for Sub-Woofer
･Fc= 60Hz, 80Hz, 100Hz, 120Hz, 160Hz, 200Hz, 240Hz, 280Hz
･Peaking or low shelf or high shelf filter is used.
･Lch / Rch Concurrent control
･+24 ~ -103dB ( 0.5dB step ), -∞dB
･Soft transition and soft mute function
･ Lch / Rch Concurrent control, Sub-Woofer ch Independent control
･It decreases by 1dB step from a volume setting value.
( Lch/Rch : 0dB/-∞dB, 0dB/-126dB, 0dB/-125dB, ･････, 0dB/0dB, ･････,
-125dB/0dB, -126dB/0dB, -∞dB/0dB )
･Lch / Rch Concurrent control, Sub-Woofer ch Independent control.
･+24 ~ -103dB (0.5dB step), -∞dB
･A clip with an arbitrary output amplitude is possible.
･Lch / Rch Concurrent control, Sub-Woofer ch Independent control.
SEL1
SDATA1
SDATA2
Pre
Scalar
DC Cut
HPF
Channel
Mixer
BASS
MIDDLE
TREBLE
Scalar
1
Surround
Digital Audio Processing Signal Flow
Channel
Mixer
Scalar
2
7 Band
Parametric
Equalizer
EVR
＆
Balance
Post
Scalar
&
Clipper
3 Band
EVR
Post
LPF
Parametric
Equalizer
＆
Balance
Scalar
&
Clipper
SEL2
SDATAO1
SDATAO2
SPEAKER
OUTPUT
SEL3
DSP Block diagram
DAC
S/PDIF
OUTPUT
ANALOG
OUTPUT
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
5/32
2010.05 - Rev.B
5 Page 
BM5446EFV
Pin
No.
Pin name Pin voltage
Pin explanation
Technical Note
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Internal equivalence circuit
18
23 OUT_SPDIF
－
S/PDIF output pin
23
24 OUT_DAC2
25 OUT_DAC1
26 ERROR
2.5V
3.3V
ch2 DAC output pin
ch1 DAC output pin
Please connect it with the latter part circuit
through the capacitor.
Error flag pin
Please connect pull-up resistor.
H: While Normal
L: While Error
15,20
27
24,25
4
27
500
26
27 VCCA
Vcc Power supply pin for Analog signal
30
31
VCCP2
Vcc Power supply pin for ch2 PWM signal
33
34
OUT2P
Vcc～0V
Output pin of ch2 positive PWM signal
Please connect to Output LPF.
35 BSP2P
－
Boot-strap pin of ch2 positive
Please connect the capacitor.
36
37
GNDP2
0V GND pin for ch2 PWM signal
38
39
OUT2N
Vcc～0V
Output pin of ch2 negative PWM signal
Please connect to Output LPF.
40 BSP2N
－ Boot-strap pin of ch2 negative
Please connect the capacitor.
42 BSP1N
－
Boot-strap pin of ch1 negative
Please connect the capacitor.
43
44
OUT1N
Vcc～0V
Output pin of ch1 negative PWM signal
Please connect to Output LPF.
45
46
GNDP1
0V GND pin for ch1 PWM signal
47 BSP1P
－
Boot-strap pin of ch1 positive
Please connect the capacitor.
48
49
OUT1P
Vcc～0V
Output pin of ch1 positive PWM signal
Please connect to Output LPF.
51
52
VCCP1
－ Power supply pin for ch1 PWM signal
29
32
41 N.C.
50
53
－ Non connection pin
4
－
30,31
35
40
33,34
38,39
36,37
51,52
42
47
43,44
48,49
45,46
－
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
11/32
2010.05 - Rev.B
11 Page | ||
| Páginas | Total 33 Páginas | |
| PDF Descargar | [ Datasheet BM5446EFV.PDF ] | |
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