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SC9260
2-CH ELECTRONIC VOLUME CONTROLLER CONTROLLED BY SERIAL INTERFACE WITH LOUDNESS CONTROL
DESCRIPTION
The SC9260 and SC9260S are an optimum CMOS with I2C interface on Chip, which has been designed for electrification of volume control of audio equipment, etc.
FEATURES
* Attenuation can be controlled from 0dB to -78dB by 2dB/step. * This ICs feature a built-180in loudness circuit.(20dB tap) * The volume, balance and loudness circuits can be controlled by I2C series data. * CS (Chip Select) input allows control of up to 2 of this chip on the same bus. * Use Polysilicon resistors enable low-distortion, high-performance volume system. * Package is DIP-16 and SOP-16
DIP-16-300-2.54
SOP-16-300-1.27
ORDERING INFORMATION
Device SC9260 SC9260S Package DIP-16-300-2.54 SOP-16-300-1.27
APPLICATIONS
* Digital volume control Radio * CD, VCD and DVD system volume control * DTS system volume control * Audio system volume control
BLOCK DIAGRAM
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SC9260
ABSOLUTE MAXIMUM RATINGS (Tamb=25C)
Characteristics Supply Voltage Input Voltage Power Dissipation Operating Temperature Storage Temperature Symbol VDD VIN PD Topr Tstg Value -0.3~15 -0.3~VDD+0.3 300 -40~85 -55~150 Unit V V mW C C
ELECTRICAL CHARACTERISTICS (Unless otherwise specified, Tamb=25C, VDD=9 V)
Characteristics Operating Supply Voltage Operating Supply Current Input Voltage " Level H" " Level L" " Level H" Input Voltage " Level L" " Level H" " Level L" VIL(2) IIH IIL RVR RON ATT RVR THD ATTM CT VN fop TCK TSTB Volume error between left and right fIN=1kHz VIN=1Vrms RL=100K Rg=600 CK, DATA, STB CK input STB input 0dB dB 0dB VIH=VDD VIL=0V Symbol VDD IDD VIH(1) VIL(1) VIH(2) CS input pin Test condition Tamb=-40~85C No load CK, DATA, STB input pin VDD=4.5~12V Min. 4.5 4.0 0 VDDx0. 7 0 -1 -1 20 Typ. 9.0 0.3 Max. 12 1.0 VDD 1.0 VDD VDDx0. 3 1 1 37 600 2 3 500 1.0 2.0 A k dB % % dB dB Vrms kHz s V Unit V mA V
28 250 0 0 0.01 100 100 2.0 0.5 1.0
Input Current
All input pin
Volume Resistance Value Analog Switch ON Resistance Attenuation Error Volume Balance Between Left And Right Total Harmonic Distortion Maximum Attenuation Cross Talk Output Noise Voltage Operation Frequency Minimum Pulse Width
Loudness " OFF" -
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SC9260
PIN CONFIGURATION
PIN DESCRIPTIONS
Pin no. 1 2 3 4 5 6 Pin name VSS L-OUT L-IN L-LD1 L-LD2 L-GND Digital ground pin Left channel volume output pin Left channel volume input pin Left channel tap output pins for loudness (1) Left channel tap output pins for loudness (2) Analog ground pins Chip select input pin. Input pin for designating chip select code. This pin correspond to bit 7 CS " which is chip select bit in serial data. C1" When CS=" and C1=" , data is valid. 1" 1" When CS=" and C1=" , data is valid. 0" 0" 8 CK Clock input pin. Clock input for data transfer. Data input pin. 9 DATA Attenuation channel selection data input terminal. Data consists of 13 bits and input by CK signal. Strobe input pin. 10 11 12 13 14 15 STB R-GND R-LD2 R-LD1 R-IN R-OUT Attenuation setting signal take from DATA and CK terminals are latched when this terminal is placed at " level. H" Analog ground pins Right channel tap output pins for loudness (2) Right channel tap output pins for loudness (1) Right channel volume input pin Right channel volume output pin Description
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16 VDD Power supply pin.
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SC9260
FUNCTION DESCRIPTION
1. Volume circuit Volume circuit consist of ladder resistor and analog switch. Tap for loudness is connected to step 10 (20dB). Loudness operation is controlled by LS1/LS2 switches. Equivalence circuit
Volume step and attenuation Step K0 K1 K2 K3 K4 K5 K6 K7 K8 K9 K10 K11 K12 K13 K14 K15 K16 K17 K18 K19 K20 attenuation 0(dB) 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 step K21 K22 K23 K24 K25 K26 K27 K28 K29 K30 K31 K32 K33 K34 K35 K36 K37 K38 K39 K40 attenuation 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 74 76 78
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SC9260
Loudness ON: LS1=ON, LS2=OFF Loudness OFF: LS1=OFF, LS2=ON.
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2. Setting volume values Optional attenuation data is input through the DATA, CK and STB terminals. Data consists of 18 bits as follows (1) Serial data format
(2)Chip select code (C1~C4) Chip select code is set to use serial bus line in common with other ICs. Data C2, C3, C4 is fixed 0, 1, 1 in SC9260. When level of CS input pin (7 pin) correspond to C1 bit, data is valid.
(3)L is left-channel select data; R is right-channel select data (L/R) When L=1, left-channel volume is set; when R=1, right-channel volume is set. (When R=L=1, both channel volume are set simultaneously). (4)LD is loudness setting data When LD=" , loudness is OFF (LS1=OFF, LS2=ON) 0" When LD=" , loudness is ON (LS1=ON, LS2=OFF) 1" (5)Volume setting data (D1~D6) List of volume data and step Enabled Switch K0 K1 K2 K3 K4 K5 K6 K7 K8 K9 K10 K11 K12 K13 K14 K15 K16 K17 K18 K19 D1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 D2 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 D3 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 D4 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 D5 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 D6 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Enabled Switch K20 K21 K22 K23 K24 K25 K26 K27 K28 K29 K30 K31 K32 K33 K34 K35 K36 K37 K38 K39 K40 D1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 D2 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 D3 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 D4 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 D5 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 D6 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1
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SC9260
(Note) if data other than those listed above are input, volume values are undefined. (6)Serial data timing Input CK, DATA and STB according to the following timing.
TEST CIRCUIT
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SC9260
TYPICAL APPLICATION CIRCUIT
Note: L-ch circuit is loudness operation; R-ch circuit is without loudness. R1=8.2k, C1=1500pF C2=0.1F For preventing noise when loudness is turned on or off, R=22k~470k High- frequency digital signals are input to pins CK, DATA and STB. Since these signals may cause noise in analog circuits, either use shield wire for CK, DATA, and STB signal lines, or design the pattern so that these signal lines are protected by the ground line.
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SC9260
PACKAGE OUTLINE
DIP-16-300-2.54 UNIT: mm
SOP-16-300-1.27
UNIT: mm
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SC9260
HANDLING MOS DEVICES:
Electrostatic charges can exist in many things. All of our MOS devices are internally protected against electrostatic discharge but they can be damaged if the following precautions are not taken: * Persons at a work bench should be earthed via a wrist strap. * Equipment cases should be earthed. * All tools used during assembly, including soldering tools and solder baths, must be earthed. * MOS devices should be packed for dispatch in antistatic/conductive containers.
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