ROHM BD3822FS, BD3824FS Technical data

Video/Audio Interfaces for TV and DVD Recorders

NTSC-PAL Audio I/O
Interface for Recording/Playing

BD3822FS, BD3824FS

ƔDescription

BD3822FS and BD3824FS are the audio selectors with internal input selector, gain amp, ALC and power save ON/OFF functions.
BD3822FS contains the 1/2 power compression amp for level meter and 2ch volume. BD3824FS contains the line amp.
BD3822FS and BD3824FS unify the board pattern by pin compatible, and can be used individually as a high-end and low-end
model.

ƔFeatures

1) Low distortion (0.0015%) and low noise (3.2μVrms) by using a resistance ladder type circuit for volume. Shock sound in
switching is also reduced (BD3822FS)

2) Low distortion (0.0015%) and low noises (2.3μVrms)(BD3824FS)

3) Contains an ALC circuit, and can also be used as an RF output

4) Best suited to energy-saving design by low current consumption by using the Bi-CMOS process; compact regulator in the

set, being advantageous to heating in terms of quality

5) SSOP-A32 is used for package. The PCB layout can be easy and the area of PCB is reduced by putting sound input

terminals together, and output terminals, too.

6) BD3822FS and BD3824FS can be used with the same PCB board.

2

C BUS data format of BD3822FS is upward compatible with BD3824FS, and can be used without changing the software.

7) I

8) A system is employed, in which the waveform connected to the input (tuner, Front, Ext) is not distorted even in standby

m o d e .

ƔApplications

DVD recorder

ƔProduct lineup

TECHNICAL NOTE

Function BD3822FS BD3824FS

Volume function Available -

1/2 power compression amp Available -

Line amp - Available

Circuit current (mA) 7 6.4

Output noise (μVrms) 3.2 2.3

BD3822FS is an upstream compatible IC with BD3824FS.

Ver.B Oct.2005

ƔAbsolute maximum ratings (Ta=25qC)

Parameter Symbol Limits Unit

Applied voltage VCC 10.0 V

Input voltage VIN VCC+0.3GND-0.3 V

Power Dissipation Pd 950

*1

mW

Operating temperature Topr -40+85 *2 qC

Storage temperature Tastg -55+150 qC

*1 Reduced by 7.6 mW/qC at 25qC or higher.

Thermal resistance Tja = 131.6 (°C/W), when Rohm standard board is mounted.

3

Rohm standard board : Size: 70701.6 (mm

)

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

*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25qC)

Parameter Symbol Min. Typ. Max. Unit

Power Supply voltage *3 VCC 7.0 - 9.5 V

*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.

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Ɣ Electric characteristics BD3822FS

(Unless specified: Ta=25, VCC=9V, f=1kHz, V

=1Vrms, Rg=600Ԉ, RL=10kԈ,Gain Amp=0dB,Volume=0dB,

IN

Input terminal=Front1,Output Terminal=OUT1)

Parameter Symbol

Min. Typ. Max.

Circuit current upon no signal IQ - 7 30 mA VIN=0Vrms

Standby current IOFF - 540 1000 μA £Power OFF¤ MODE

Voltage gain GV -1.5 0 1.5 dB GV=20log(VOUT/VIN)

Maximum output voltage VOM 2.0 2.5 - Vrms

Channel balance CB -1.5 0 1.5 dB

GENERAL

Total harmonic distortion THD - 0.0015 0.05 %

Output noise voltage * VNO - 3.2 16 μVrms

Residual noise voltage * VNOR - 2 10 μVrms Volume = -dB,Rg = 0Ԉ, BW=IHF-A

Cross-talk between channels * CTC - -110 -80 dB Rg = 0ԈBW = IHF-A

Input impedance RIN 77 110 143 kԈ *1)

Maximum input voltage VIM 2.1 2.5 - Vrms

Cross-talk between selector CTS - -110 -80 dB

INPUT

Tuner gain GTU 10 12 14 dB

Output offset voltage VDC -20 0 20 mV Tuner SAPΦFront1

Volume control range VV1 -81 -78 -75 dB GV=20log(VOUT/VIN),BW = IHF-A

Maximum attenuation GV MIN1 - -106 -85 dB

Step resolution 1 GV STEP1 - 1 - dB Volume=0-46dB

Step resolution 2 GV STEP2 - 2 - dB Volume=-46-78dB

VOLUME

Attenuation set error 1 GV ERR1 -2 0 2 dB Volume=0-58dB

Attenuation set error 2 GV ERR2 -3 0 3 dB Volume=-60-78dB

Minimum gain GMIN -1.5 0 1.5 dB Gain Amp=0dB,G=20log(VOUT/VIN)

Maximum gain G MAX 4.5 6 7.5 dB

Step resolution G STEP - 0.2 - dB 4.6dB to 5.6dB

GAIN AMP

Gain set error G ERR -1.5 0 1.5 dB

Mute attenuation GMUTE - -110 -85 dB

MUTE

ALC I/O level 1 ALC1 - -3 0 dBV Suppression level is set to -3dBV.

ALC I/O level 2 ALC2 - -5 -2 dBV Suppression level is set to -5dBV.

ALC

ALC I/O level 3 ALC3 - -7 -4 dBV Suppression level is set to -7dBV.

Output offset voltage VDC OFF - 30 100 mV VIN =0dBV

DC maximum output voltage VDC MAX 2.9 3.7 - V VIN =+6dBV

DC standard output voltage VDC ST 1.1 1.5 1.9 V VIN =-10dBV

DC voltage difference between
channels

Square-Law

Compression Amp

DC output voltage linearity

ͼVDC -250 0 250 mV VIN =-10dBV

ͼVDC/

ͼV

0.9 1.4 1.9 V V

IN

*1: 1) Refers to 1,2,3,9,10,11,12,13,14,25,26,31,32 pin terminals.

Limits

Unit Conditions

VOM at THD(VOUT)=1%
BW=400-30KHz

CB = GV1-GV2
GV1:ch1Gain GV2:ch2 Gain

VIN=2Vrms,Volume=-12dB
Gain Amp=5.6dB,BW=400-30KHz

Volume=-12dB,Gain Amp=5.6dB
Rg = 0Ԉ, BW=IHF-A

VIM at THD(VOUT)=1%
BW=400-30KHz *1)
Rg = 0ԈBW = IHF-A
CTS=20log(VOUT/VIN)

Tuner gain=12dB, VIN=0.25Vrms
G=20log(VOUT/VIN)

Volume = -dB, BW = IHF-A

V=20log(VOUT/VIN)

G

Gain Amp=6dB,VIN=500mVrms
G=20log(VOUT/VIN)

Mute ON
GMUTE=20log(VOUT/VIN)
BW = IHF-A
Volume=-dB, or -78dB

IN =-30-6dBV

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