ROHM BD3823FV Technical data

Video / Audio Interfaces for TV and DVD Recorders

NTSC-PAL Audio I/O

TECHNICAL NOTE

Interface for Recording

BD3823FV

ƔDescription

BD3823FV is a low-noise (3.2ҏμVrms), low distortion (0.0015%), 5ch selector, incorporating a resistor-ladder type
volume.
Because of a wide power supply voltage range (7V to 14.5V), BD3823FV can meet a wide input voltage (to 4.5 Vms), and high S/N
can be achieved. In addition, the built-in volume does not add any distortion ratio characteristics, even when the attenution is varied,
and is applicable for high-quality audio systems.

ƔFeatures

1) A resistor-ladder type volume circuit is with a low distortion ratio (0.0015% with volume set to –6dB) and low noise (3.2 ȝVrms with
volume set to -6dB).

2) By grouping sound input terminals with output terminals, the PCB layout is reduced.

3) Small package SSOP - B20 achieves good crosstalk characteristicss (-110 dB).

4) The use of Bi-CMOS process enables low current consumption and energy saving design.

Because of low current consumption, BD3823FV has the advantage in quality over the scaling down of the internal regulators and
heat controls.

ƔApplications

DVD recorders

ƔAbsolute maximum rating (T

Parameter Symbol Limits Unit

Applied Voltage

Input voltage VIN
Power Dissipation Pd 810
Operating Temperature Topr
Storage Temperature Tastg

*1 Reduced by 6.5 mW/qC at 25qC or higher.

Thermal resistance Tja = 154 (°C/W), when Rohm standard board is mounted.
Rohm standard board: Size: 70701.6 (mm

*2 As long as voltage stays within operating voltage range, certain circuit operation is guaranteed in

the operating temperature range.
Allowable power loss conditions are related to temperature, to which care must be taken.
In addition though the standard value of its electrical characteristics cannot be guaranteed under
the conditions other than those specified, basic functions are maintained.

ƔOperating range (Basic operation at Ta=25)

Parameter Symbol Min. Typ. Max. Unit

Power supply voltage

*3 As long as temperature and operating voltage meet specifications

In addition, though the standard value of its electrical characteristics cannot be guaranteed under
the conditions other than those specified, basic functions are maintained.

a=25°C)

VCC 15.0

SCL, SDA 7.0

VCC+0.3GND-0.3

3

)

Material: FR4 glass-epoxy substrate (copper foil area: not more than 3%).

*

3

VCC 7.0 12.0 14.5 V

*

1

mW

-40䌾+85

-55+150

*

2

V

V

°C
°C

Ver.B Oct.2005

!

ƔElectrical characteristics

Unless otherwise specified, Ta=25, VCC=12V, f=1kHz, Vin=1Vrms, Rg=600Ԉ, R
Input terminal = Front 1, Output terminal = Out 1

Limits

Parameter Symbol

Min. Typ. Max.

Circuit Current upon no signal IQ - 2.5 10 mA VIN=0Vrms

L=10kԈ, Gain selector = 0dB, Volume = 0dB,

Unit Conditions

Voltage gain GV -1.5 0 1.5 КB GV=20log(V

Maximum output voltage VOM 3.0 3.6 - Vrms

Channel balance CB -1.5 0 1.5 dB

Total harmonic distortion THD - 0.0015 0.05 %

Output noise voltage * VNO - 3.2 16 ȝVrms

GENERAL

Residual output noise voltage * V

- 2 10 ȝVrms

NOR

Cross-talk between channels * CTC - -110 -80 dB

VOM at THD(V
BW=400Hz-30KHz

CB = G
GV1:ch1Gain, GV2:ch2 Gain

VIN=2Vrms,Volume=-6dB
BW=400Hz-30KHz

Volume=-6dB

g = 0ȍ, BW=IHF-A

R

Volume = -dB
Rg = 0ȍ, BW=IHF-A

Rg = 0ȍ
BW = IHF-A

OUT/VIN

OUT

V1-GV2

Input impedance RIN 77 110 143 kȍ 1pin-10pin terminal

Maximum input voltage VIM 3.1 3.6

1)

- Vrms

VIM at THD(V
BW=400Hz-30KHz

OUT

)=1%

1pin-10pin terminal

Rg = 0ȍ

Cross-talk between selectors * CTS - -110 -80 dB

Volume control range VV -32.5 -30.5 -28.5 dB

BW = IHF-A
CTS=20log(V

GV=20log(V
BW = IHF-A

OUT/VIN

OUT/VIN

Volume = -dB

Maximum attenuation * G

VOLUME

Step resolution G

- -106 -85 dB

V MIN

V STEP

- 0.5 - dB Volume=0-30.5dB

GV=20log(V
BW = IHF-A

OUT/VIN

)

)=1%

)

)

)

Attenuation set error G

-1.5 0 1.5 dB Volume=0-30.5dB

V ERR

Gain Selector=6dB

Maximum gain G

Step resolution G

GAIN SELECTOR

Gain set error G

4.5 6 7.5 dB

MAX

=500mVrms

V

IN

G=20log(V

- 2 - dB From 2dB to 4dB

STEP

-1.5 0 1.5 dB

ERR

OUT/VIN

)

ͰVP-9690A (average value detection, effective value display) filter by Matsushita Communication is used for * measurement.
ͰPhase between input/output is the same.
ͰThis IC is not designed to be radiation-resistant.

1)V

V

=2.5Vrms(TYP) at VCC=9VTHD(V

IM

=4.2Vrms(TYP) at VCC=14VTHD(V

IN

OUT

)=1%

OUT

)=1%

2/8

ƔTiming chart

Electrical specifications and timing of bus lines and I/O stages

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Fig.1 Timing Definition on I

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2

C BUS

2

Table 1 . Characteristics of the SDA and SCL BUS lines for I

C BUS devices

Parameter Symbol

SCL clock frequency

1

Bus free time between a STOP and START condition

2

Hold time (repeated) START condition. After this period, the first clock

3

pulse is generated

LOW period of the SCL clock

4

HIGH period of the SCL clock

5

Set-up time for a repeated START condition

6

Data hold time

7

Data set-up time

8

Rise time of both SDA and SCL signals

9

Fall time of both SDA and SCL signals

10

Set-up time for STOP condition

11

Capacitive load for each bus line

12

The above numerical values all correspond to VIH min and VIL max levels (see Table 2).
*The input signals must internally provide at least 300 ns hold-time for SDA signals (at V
undefined region at the fall-end of SCL.

2

Table 2 . Characteristics of the SDA and SCL I/O stages for I

C BUS devices

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㪧

High speed mode

I2C BUS

Min. Max.

fSCL 0 400 kHz

tBUF 1.3 - ȝs

tHD;STA 0.6 - ȝs

tLOW 1.3 - ȝs

tHIGH 0.6 - ȝs

tSU;STA 0.6 - ȝs

tHD;DAT 0* - ȝs

tSU; DAT 100 - ns

tR 20+Cb 300 ns

tF 20+Cb 300 ns

tSU;STO 0.6 - ȝs

Cb - 400 pF

IH min of SCL signals) in order to cross over

Unit

High speed mode

Parameter

Symbol

I2C BUS

Min. Max.

Low-level input voltage : fixed input levels

13

Low-level input voltage : fixed input levels

14

Hysteresis of Schmitt trigger inputs: fixed input levels

15

VIL -0.5 1.0 V

VIH 2.3 - ȝs

Vhys n/a n/a V

16 Pulse width of spikes which must be suppressed by the input filter. tSP 0 50 ns

17 Low-level output voltage (open drain): at 3mA sink current VOL1 0 0.4 V

Output fall time from VIHmin. to VIHmax. with a bus capacitance from 10

18

pF to 400pF: with up to 3mA sink current at VOL1

Input current each I/O pin with an input voltage between 0.4V and 0.9

19

VCCmax.

tOF 20+0.1Cb 250 ns

Ii -10 10 ȝA

20 Capacitance for each I/O pin Ci - 10 pF

n/a = not applicable

3/8

Unit