Ordering number : EN5681 CMOS LSI LC75392, 75392M Single-Chip Electronic Volume Control System Overview Package Dimensions The LC75392 (DIP-30SD) and the LC75392M (MFP30S) are electronic volume control ICs that provide input and output switching, volume, and tone control functions controlled by data transferred over a serial interface. unit: mm 3196-DIP30SD [LC75392] Functions • Input and output switching: Four inputs and outputs can be switched independently. • Volume control: A balance function can be implemented by controlling the left and right levels independently. Each channel can be set to 0 to –20 dB in 2 dB steps, –20 to –32 dB in 3 dB steps, –32 to –52 dB in 4 dB steps, –52 dB to –70 dB in 4.5 dB steps, and –∞. •Tone controls: Internal switches are provided to select between four sets of frequency characteristics. A buffer function can be implemented using external components. SANYO: DIP30SD unit: mm 3216-MFP30S Features [LC75392M] Serial data interface: Support for control and communication in the CCB format. SANYO: MFP30S Specifications Absolute Maximum Ratings at Ta = 25°C, VSS = 0 V Parameter Symbol Conditions Maximum supply voltage VDD max VDD Maximum input voltage VIN max CL, DI, CE, L1, L2, L3, L4, R1, R2, R3, R4 Allowable power dissipation Pd max Ta ≤ 85°C Ratings Unit 12 VSS – 0.3 to VDD + 0.3 160 V V mW Operating temperature Topr –40 to +85 °C Storage temperature Tstg –50 to +125 °C • CCB is a trademark of SANYO ELECTRIC CO., LTD. • CCB is SANYO’s original bus format and all the bus addresses are controlled by SANYO. SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN 73097HA(OT) No. 5681-1/12 LC75392, 75392M Allowable Operating Ranges at Ta = 25°C, VSS = 0 V Parameter Symbol Conditions Ratings min typ max Unit Supply voltage VDD VDD 5.5 11.0 V Input high-level voltage VIH CL, DI, CE 4.0 VDD V Input low-level voltage VIL CL, DI, CE VSS 1.0 V Input voltage amplitude VIN L1, L2, L3, L4, R1, R2, R3, R4 VSS VDD Vp-p tøW Input pulse width CL 1.0 µs Setup time tsetup CL, DI, CE 1.0 µs Hold time thold CL, DI, CE 1.0 Operating frequency fopg CL µs 500 kHz Electrical Characteristics at Ta = 25°C, VDD = 10 V, VSS = 0 V Parameter Symbol Conditions Ratings min typ max Unit [Input Block] Input resistance Rin L1, L2, L3, L4, R1, R2, R3, R4 500 kΩ [Overall] THD1 VIN = 100 mV rms, f = 1 kHz, overall, buffer mode off, flat state 0.013 % THD2 VIN = 100 mV rms, f = 20 kHz, overall, buffer mode off, flat state 0.013 % Total harmonic distortion Crosstalk Output at maximum attenuation CT VIN = 1 V rms, f = 1 kHz, overall, Rg = 1 kΩ, buffer mode off, flat state 81 dB VO min VIN = 1 V rms, f = 1 kHz, main volume set to –∞, buffer mode on –80 dB VN1 Flat overall (IHF-A), Rg = 1 kΩ, buffer mode off, flat state 15 µV VN2 Flat overall (DIN-AUDIO), Rg = 1 kΩ, buffer mode off, flat state 22 µV Output noise voltage Current drain IDD VDD – VSS = 11 V Input high-level current IIH CL, DI, CE, VIN = 10 V Input low-level current IIL CL, DI, CE, VIN = 0 V 7 10 10 –10 mA µA µA Equivalent Circuit Block Diagram Latch Decoder Control Shift register No. 5681-2/12 LC75392, 75392M Test Circuit Total Harmonic Distortion Use circuit constants identical to those of the right channel. THD in SG out Distortion analyzer No. 5681-3/12 LC75392, 75392M Output Noise Voltage Noise meter Use circuit constants identical to those of the right channel. No. 5681-4/12 LC75392, 75392M Crosstalk Volt meter Use circuit constants identical to those of the right channel. No. 5681-5/12 LC75392, 75392M Pin Assignment Top view Pin Functions Pin Pin No. Function LVROUT RVROUT 1 30 Volume control outputs LVRIN RVRIN 2 29 Volume control inputs LTOUT RTOUT 3 28 Tone control circuit outputs LTCOM RTCOM 4 27 Tone control circuit operational amplifier inverting inputs LT1 LT2 LT3 LT4 RT1 RT2 RT3 RT4 8 7 6 5 23 24 25 26 Connections for the tone control pattern external constants Circuit Continued on next page. No. 5681-6/12 LC75392, 75392M Continued from preceding page. Pin Pin No. Function L1 L2 L3 L4 R1 R2 R3 R4 12 11 10 9 19 20 21 22 Audio signal inputs and outputs VDD 13 Power supply Vref 18 Analog system ground VSS 17 Ground CL DI 14 15 Serial data and clock inputs for device control 16 • Chip enable • Data is read into an internal latch and the analog switches operate when this pin goes from high to low. Data transfers are enabled when this pin is high. CE Circuit No. 5681-7/12 LC75392, 75392M Volume Control Equivalent Circuit No. 5681-8/12 LC75392, 75392M Control System Timing and Data Format To control the LC75392, applications must apply data in the stipulated format to the CE, CL, and DI pins. This data consists of 32 bits, of which 8 bits are the address and 24 bits are the control data. 1 µs ≤ tDEST Don’t care Volume control data Don’t Don’t care care Tone pattern control data Don’t care Buffer mode Test mode Don’t care Function switch control data Channel selection Left and right at the same time Note: The bits D20, D21, and D22 are IC test mode control data. User applications must always set these bits to 0. No. 5681-9/12 LC75392, 75392M Sample Application Circuit (Three-input type) Use circuit constants identical to those of the right channel. Usage Notes • The states of the internal analog switches are undefined immediately after power is first applied. Applications should apply muting to the outputs of this IC using external circuits until the control data has been set up. • The CL, DI, and CE pin lines should be shielded by the ground pattern or shielded lines should be used to prevent the high-frequency digital signals that are transmitted over these lines from entering the analog system as noise. • We recommend that applications use a sequence of several smaller steps to approach the final setting when changing the value of the volume control setting significantly. For example, the sequence shown below should be used when changing from 0 dB to –∞. This can reduce switching noise. Example: 0 dB → –10 dB → –20 dB → –40 dB → –70 dB →–∞ No. 5681-10/12 LC75392, 75392M Tone Control Characteristics Main Volume Step Characteristics Output level – dB Steps Frequency, f – Hz THD vs. Frequency Characteristics THD vs. Power-Supply Voltage Characteristics 80 kHz low-pass filter Overall Frequency, f – Hz Total harmonic distortion, THD – % Total harmonic distortion, THD – % Main volume attenuation – dB Overall 80 kHz low-pass filter Overall Buffer mode off Flat Power-supply voltage, VDD – V Total harmonic distortion, THD – % THD vs. Input Level Characteristics 80 kHz low-pass filter Overall Buffer mode off Flat Input level, VIN – dBV No. 5681-11/12 LC75392, 75392M ■ No products described or contained herein are intended for use in surgical implants, life-support systems, aerospace equipment, nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of which may directly or indirectly cause injury, death or property loss. ■ Anyone purchasing any products described or contained herein for an above-mentioned use shall: ➀ Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors and all their officers and employees, jointly and severally, against any and all claims and litigation and all damages, cost and expenses associated with such use: ➁ Not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees jointly or severally. ■ Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use or any infringements of intellectual property rights or other rights of third parties. This catalog provides information as of July, 1997. Specifications and information herein are subject to change without notice. No. 5681-12/12