BD3812F-E2 Datasheet BD3812F-E2 | P4-P6

Technical Note

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BD3812F

3) Basic configuration of control data format

Input direction

MSB LSB

Data

D16 D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0

Data Select Address

・Control data format

Input direction

Select Address

Data

①

D16 D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0

Master Volume 2ch Master Volume 1ch 1 1 0

Data

②

D16 D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0

* * * * * * * * * * * Output gain amp 1 1 1

* is 0 or 1.

By changing the setting of select address, 4 control data formats can be selected.

Do not set the select address data to other than specified above.

At power on, initialize all the data.

Input direction

MSB LSB MSB LSB

Data① LData② L

“L” shows latch.

After power on, in the second time or after, only data you want to change can be set.

(Example) When to change bus

Input direction

MSB LSB

Data① L

“L” shows latch.

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BD3812F

4) SEL terminal setting

By determining the SEL terminal voltage, select address can be fixed.

An example of the SEL terminal voltage setting method is shown below.

Setting

P1

Condition

P2

Condition

Setting of

SEL(12pin) Terminal

SEL(12pin)

Terminal Voltage(V)

Select Address

D2 D1

Setting 1 VEE

－

VEE 0 0

Setting 2 VCC VEE

VCC/3+2×VEE/3 0 1

Setting 3 VCC VEE

VCC/3 1 0

Setting 4 VCC －

VCC 1 1

SEL terminal voltage is DGND standard.

When to use several chips of BD3812F

Select address can be changed by setting SEL terminal (12pin), therefore, up to 4 chips can be used on a same bus line.

When to use one chip or two chips of this IC, use the setting 1 and the setting 4. In this case, the terminal voltage of 12pin

may be VCC or VEE, therefore external resistor of 12pin is unnecessary.

When to use BD3812F and BD3811K1 at the same time

By using BD3812F and BD3811K1 at the same time, independent control of 8ch volume can be made. And control is

available on a same bus line. In this case, be sure to set the SEL terminal setting to “setting 4”.

P2

20k

P1

10k

VEE

VCC

12

P1

VCC

12

P1

VEE

12

P2

10k

P1

20k

VEE

VCC

12

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BD3812F

-10

-8

-6

-4

-2

0

2

4

6

8

10

10 100 1000 10000 100000

FREQUENCY (Hz)

GAIN(dB)

0.001

0.01

0.1

1

10

0.001 0.01 0.1 1 10

INPUT VOLTAGE (Vrms)

OUTPUT VOLTAGE (Vrms)

-5

0

5

10

15

20

10 100 1000 10000 100000

FREQUENCY (Hz)

GAIN (dB)

0.0001

0.001

0.01

0.1

1

10

0.001 0.01 0.1 1 10

INPUT VOLTAGE (Vrms)

THD+N (%)

-2.5

-2

-1.5

-1

-0.5

0

0.5

1

1.5

2

2.5

0246810

POWER SUPPLY (V)

CIRCUIT CURRENT (mA)

●Application circuit

UNIT

RESISTOR :Ω

CAPACITOR : F

Fig.2

●Reference data

LOGIC

1

2

3

4

5

6

7

8

9

10

11

12

13

14

CL

DA

MUTE

SEL

DGND

OUT1

OUT2

10µ

10μ

VEE

AGND

VCC

IN1

IN2

47μ

47µ

AGND

Fig.3 Circuit current - Power supply

Fig.4 Voltage gain - Frequency

Fig.5 Output voltage - Input voltage

Fig.6 THD+N - Input voltage

Fig.7 Output gain - Frequency

VCC

VEE

0, 6～18dB

2dB/step

BD3812F-E2

BD3812F-E2

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