Datasheet
24bit Audio CODEC series
3W+3W Class AB/D Speaker AMP
Stereo Audio CODEC
BU26156RFS
General Description
BU26156RFS is Low Power Stereo Audio CODECs with
built-in various acoustic effects. BU26156RFS has stereo
line and monaural mic inputs that can input to 2Vrms,
stereo speaker amplifier that can change Class AB / D
and stereo Headphone Outputs.BU26156 also has
built-in voltage regulator for the stability of CODEC
characteristic that is sensitive to the outside noise.
Important Characteristic
Supply Voltage
SPLVDD,SPRVDD:
HVDD1:
HPVDD:
IOVDD:
Mic-ADC SNR:
Line-ADC SNR:
DAC-SP SNR:
DAC-LOUT SNR:
Operating Temperature:
Package
HTSSOP-A44R
2.7V to 5.5V
2.7V to 3.6V
2.7V to 3.6V
1.65V to 5.5V
87[dB](Typ.)
93[dB](Typ.)
86[dB](Typ.)
95[dB](Typ.)
-20℃ to +85℃
Features
24bit Stereo ADC, DAC
2Vrms Input available, Stereo Line Input with ALC
Monoraul MIC Input with ALC
Switch Class AB/D 3W Stereo Speaker Amplifier
AM Avoidance Function
Stereo Headphone Output Amplifier
Digital signal processing
High Power Supply Rejection Ratio characteristic
Applications
Radio cassette recorder
PC Speaker
W(Typ.) x D(Typ.) x H(Max.)
18.50mm x 9.50mm x 1.00mm
Figure 1. HTSSOP-A44R
Basic Block Diagram
Figure 2.
○Product
structure：Silicon monolithic integrated circuit
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BU26156RFS
Pin Layout HTSSOP-A44R
Top View
1
HPOUTL
2
HPOUTR
3
HPGND
4
HPOUTCAP
5
NC
6
SPLVDD
7
SPLM
8
SPLP
9
SPLGND
10
SPRGND
11
SPRP
12
SPRM
13
SPRVDD
14
SPMUTE
15
BEEPIN
16
MICBIASREF
17
MICBIAS
18
HVDD 1
19
AGND
20
REGOUT
21
DGND
22
SCLK/SAD
SDATA/SDA
CSB/SCL
23
RESETB
24
IRQB
25
IOVDD
26
SDOUT
27
SDIN
28
LRCLK
29
BCLK
30
MCLKI
31
PLLC
32
MINM
33
MINP
34
AGND
35
VMID
36
LIN 1L
37
LIN 1R
38
LIN 2L
39
LIN2R
40
LIN 3L
41
LIN 3R
42
HPVDD
43
44
Datasheet
Figure 3.
Pin Description
No
25
Name
RESETB
I/O
I
Power
IOVDD
Function
Reset pin
“L” level : Reset enable.
“H” level : Reset disable.
3 wire interface: data input output pin
It is indicated as SDATA on the description
of AC characteristics.
2 wire interface : data input output pin
(Note1)
It is indicated as SDA on the description
of AC characteristics.
3 wire interface : Serial clock input pin
It is indicated as SCLK on the description
of AC characteristics.
2 wire interface: Slave address pin
Future explanation indicates SAD.
Choose from the following two kinds.
SAD Pin=HGND : ”0011010”
Reset
(input)
No use
-
23
SDATA
/SDA
IO
IOVDD
(input)
-
22
SCLK
/SAD
I
IOVDD
(input)
DGND
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BU26156RFS
SAD Pin=IOVDD : ”0011011”
3 wire interface : chip select input pin
It is indicated as CSB on the description of
AC characteristics.
(Note1)
2 wire interface : Serial clock input pin
It is indicated as SCL on the description of
AC characteristics.
SAI LR clock input/output pin
SAI bit clock input/output pin
SAI serial data input pin
SAI serial data output pin
Master Clock pin
Interrupt output Pin
Line analog input Lch pin 1
Line analog input Rch pin 1
Line analog input Lch pin 2
Line analog input Rch pin 2
Line analog input Lch pin 3
Line analog input Rch pin 3
Analog microphone + input
Analog microphone - input
Line input pin.
The input signal for this pin can output
Headphone output pins or Speaker output
pins.
External filter pin for microphone bias.
A capacitor is connected between
MICBIASREF and AGND.
Microphone bias voltage output pin
A capacitor is connected between
MICBIASCAP and AGND.
Analog reference voltage pin
A capacitor is connected between VMID
and AGND.
Regulator output pin
A capacitor is connected between
REGOUT and HGND1.
Please put in the chip close as much as
possible.
speaker Lch output + pin
speaker Lch output - pin
speaker Rch output + pin
speaker Rch output - pin
Test control pin “L” level : Release MUTE
“H” level : MUTE
Headphone Lch output pin
Headphone Rch output pin
Headphone Output capacitance pin
PLL filter pin
The width of the clock frequency to input
can be expanded.
Interface Power Supply pin
A capacitor is connected between IOVDD
and HGND1.
Speaker Lch Power Supply pin
It is used on the same voltage as SPRVDD.
A capacitor is connected between SPLVDD
and SPLGND.
Speaker Lch ground pin
Speaker Rch Power Supply pin
It is used on the same voltage as SPLVDD.
A capacitor is connected between SPRVDD
and SPRGND.
Speaker Rch ground pin
High voltage power supply 1 pin
A capacitor is connected between HVDD1
and HGND1.
Analog ground pin
Digital ground pin
Datasheet
24
CSB
/SCL
I
IOVDD
(input)
-
30
31
29
28
32
26
38
39
40
41
42
43
35
34
15
LRCLK
BCLK
SDIN
SDOUT
MCLKI
IRQB
LIN1L
LIN1R
LIN2L
LIN2R
LIN3L
LIN3R
MINP
MINM
BEEPIN
IO
IO
I
O
I
O
I
I
I
I
I
I
I
I
I
IOVDD
IOVDD
IOVDD
IOVDD
IOVDD
IOVDD
REGOUT
REGOUT
REGOUT
REGOUT
REGOUT
REGOUT
REGOUT
REGOUT
REGOUT
(input)
(input)
(input)
DGND
(input)
IOVDD
(input)
(input)
(input)
(input)
(input)
(input)
(input)
(input)
(input)
DGND
DGND
DGND
Open
DGND
Open
Open,
or coupling
capacitor
connected to
AGND near by
BU26156
16
MICBIASREF
O
HVDD1
ANGD
Open
1
MICBIAS
O
HVDD1
AGND
Open
37
VMID
O
REGOUT
AGND
-
20
REGOUT
O
HVDD1
AGND
-
8
7
11
12
14
1
2
32
33
SPLP
SPLM
SPRP
SPRM
SPMUTE
HPOUTL
HPOUTR
LOUTCAP
PLLC
O
O
O
O
I
O
O
O
O
SPLVDD
SPLVDD
SPRVDD
SPRVDD
IOVDD
HPVDD
HPVDD
HVDD1
REGOUT
SPLGND
SPLGND
SPRGND
SPRGND
DGND
HPGND
HPGND
AGND
AGND
Open
Open
Open
Open
Open
Open
Open
Open
Open
27
IOVDD
P
-
-
-
6
9
13
10
18
19, 36
21
SPLVDD
SPLGND
SPRVDD
SPRGND
HVDD1
AGND
DGND
P
P
P
P
P
P
P
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
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BU26156RFS
44
3
5
HPVDD
HPGND
NC
P
P
-
Headphone Power Supply pin.
A capacitor is connected between HPVDD
and HPGND.
Headphone ground pin.
No Connection pin. Set open this pin.
Datasheet
Open
(Note1)In case of 2 wire serial, if this pin is used with external pull-up resistor, it possibly gets noise from power. Therefore tamper noise design is required in
the noisy environment.
Application Examples
Figure 4. Application Examples1(Use internal speaker amplifier)
Figure 5.
Application Examples2
(Use external speaker amplifier)
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BU26156RFS
Absolute Maximum Ratings
Parameter
SPLVDD,
Voltage
SPRVDD
Supply
Symbol
SPLVDD
SPRVDD
HPVDD
Condition
-
Rating
-0.3 to 7.0
Datasheet
Unit
V
HPVDD Supply Voltage
-
-0.3 to 4.5
V
HVDD1 Supply Voltage
HVDD1
-
-0.3 to 4.5
V
IOVDD Supply Voltage
IOVDD
-
MCLKI, LRCLK, BCLK, SDIN,
SDATA/SDA, SCLK/SAD,
CSB/SCL, SPMUTE
LIN1L, LIN1R, LIN2L, LIN2R,
MINL, MINR, BEEPIN
-0.3 to 7.0
V
-0.3 to IOVDD+0.3
-0.3 to REGOUT+0.3
-55 to +150
2
(Tjmax=+125℃)
-1.0 to +1.0
V
V
°C
℃/W
Input Voltage
V
IN
Storage Temperature
Tstg
Θjc
-
Package power dissipation
HTSSOP-A44R
SPLM, SPLP,
SPRM, SPRP
HPOUTL, HPOUTR
Output Current 1
IOSP
A
Output Current 2
IOLO
-100 to +100
mA
Output Current 3
IOREGO
REGOUT
-30 to 0
mA
Output Current 4
IOO
All digital pins
-8 to +8
mA
Do not short the output pin to another output pin, power supply pin or GND pin.
(Output pin includes an IO pin which is in output mode)
Caution:
Operating the IC over the absolute maximum ratings may damage the IC. The damage can either be a short circuit between pins or an open circuit
between pins and the internal circuitry. Therefore, it is important to consider circuit protection measures, such as adding a fuse, in case the IC is operated over
the absolute maximum ratings.
Recommended Operating Condition
Parameter
SPLVDD,
Voltage
SPRVDD
Supply
Symbol
SPLVDD
SPRVDD
HPVDD
HVDD1
IOVDD
Top
Condition
SPLVDD=SPRVDD
-
-
-
-
Rating
2.7 to 5.5
2.7 to 3.6
2.7 to 3.6
1.65 to 5.5
-20 to +85
Unit
V
V
V
V
°C
HPVDD Supply Voltage
HVDD1 Supply Voltage
IOVDD Supply Voltage
Operating Temperature
*The radiation-proof design is not carried out.
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