Ordering number : EN5588 CMOS LSI LC75373E Electronic Volume Control for Car Stereo Systems Overview Package Dimensions The LC75373E is an electronic volume control that can implement volume, balance, fader, bass/treble + super bass, loudness, input switching, and input/output level control functions with a minimal number of external components. unit: mm 3148-QFP44MA [LC75373E] Functions • Volume: Provides 81 positions, from 0 dB to –79 dB (in 1-dB steps) and –∞. A balance function can be implemented by controlling the left and right channels independently. • Fader: This function can attenuate either the rear or the front outputs over 16 positions. (From 0 to –20 dB in 2-dB steps, from –20 to –25 dB in one 5-dB step, from –25 to –45 dB in 10-dB steps, –60 dB, and –∞.) • Bass/treble: Forms an NF-type tone control circuit with the addition of external capacitors. The base and treble controls each have 15 positions. • Input gain: The input signal can be amplified from 0 dB to +18.75 dB in 1.25 dB steps. • Output gain: One of two output of 0 dB and + 6.5 dB can be selected for fader output. • Input switch: The signal can be selected from one of four inputs for each of the left and right channels. • Super bass: The position of super bass can be controlled in 11 steps. Features SANYO: QIP44MA • 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. • On-chip buffer amplifiers for a minimum of external components. • Built-in reference voltage generation circuit • Serial data input: Supports CCB format communication with the system controller. 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 Operating temperature Storage temperature Ratings Unit 11 V VSS – 0.3 to VDD + 0.3 V Topr –40 to +85 °C Tstg –50 to +125 °C SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN 22798HA (OT) No. 5588-1/21 LC75373E Allowable Operating Ranges at Ta = 25°C, VSS = 0 V max Unit Supply voltage Parameter VDD VDD 6.0 10.5 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 CL, DI, CE, LVRIN, RVRIN, L1 to L4, R1 to R4 LFIN, RFIN, LSIN, RSIN VSS VDD Vp-p Input pulse width Symbol tøW Conditions min typ CL 1 µs CL, DI, CE 1 µs thold CL, DI, CE 1 fopg CL Setup time tsetup Hold time Operating frequency µs 500 kHz max Unit Electrical Characteristics at Ta = 25°C, VDD = 8 V, VSS = 0 V Parameter Symbol Conditions min typ [Input Block] Maximum input gain Step resolution Gin max +18.75 dB Gstep +1.25 dB Gout max +6.5 dB [Output Block] Maximum output gain [Volume Control Block] Step resolution Step error ATstep ATerr 1 step = 0 to –20 dB step = –20 to –50 dB –1 –3 0 0 dB +1 +3 dB dB [Fader Volume Block] Step resolution Step error Output load resistance ATstep ATerr step =0 to –20 dB step = –20 to –25 dB 2 5 step = –25 to –45 dB 10 step = 0 to –45 dB step = –45 to –60 dB RL –2 –3 0 0 dB +2 +3 10 dB dB kΩ [Bass/Treble Control Block] Bass control range Treble control range Gbass Max. boost/cut ±9 ±10.5 ±12 dB Gtre Max. boost/cut ±8 ±10.5 ±13 dB [Super Bass Block 1 (Type GEQ)] Control range Crange Step resolution ATstep Max. boost +17 dB +1.7 dB +20 dB +2.0 dB [Super Bass Block 2 (Type T)] Control range Crange Step resolution ATstep Max. boost [Overall Characteristics] Total harmonic distortion Crosstalk Output at maximum attenuation Output noise voltage THD CT VO min VIN = 1 Vrms, f = 1 kHz, all settings flat overall 0.003 VIN = 1 Vrms, f = 1 kHz, all settings flat overall, Rg = 1 kΩ VIN = 1 Vrms, f = 1 kHz, main volume at –∞ V N1 All settings flat overall (IHF-A), Rg = 1 kΩ VN2 All settings flat overall (DIN-AUDIO), Rg = 1 kΩ Input high-level current IIH CL, DI, CE: VIN = 8 V Input low-level current IIL CL, DI, CE: VIN = 0 V 0.01 80.5 dB –80 dB 8 µV 10 µV 10 –10 % µA µA Note: Values in parenthesis are targets and will be fixed after evaluation. No. 5588-2/21 LC75373E Equivalent Circuit Block Diagram No. 5588-3/21 LC75373E Sample Application Circuit 1. When super bass circuit 1 (Type GEQ) is used Unit (capacitance: F) No. 5588-4/21 LC75373E 2. When super bass circuit 2 (Type T) is used Unit (capacitance: F) Unit (resistance: Ω) No. 5588-5/21 LC75373E Pin Assignment Top view No. 5588-6/21 LC75373E Pin Functions Pin No. Symbol 19 Vref 20 LROUT 21 LFOUT 14 RROUT 13 RFOUT Function • 1/2 VDD voltage generation block. A capacitor must be connected between Vref and VSS to suppress power supply ripple. • Fader outputs. The front and rear systems can be attenuated independently. 22 LFIN • Fader inputs 12 RFIN • Must be driven from low-impedance circuits. 28 LTOUT 6 RTOUT 31 LT1 30 LT2 29 LT3 3 RT1 4 RT2 5 RT3 26 LS1 25 LS2 24 LS3 8 RS1 9 RS2 10 RS3 Note • Tone control outputs • Connections for the bass and treble compensation capacitors for the tone control circuit Connect high-band compensation capacitors between T1 and T2. Connect low-band compensation capacitors between T2 and T3. • Super bass compensation capacitors 33 LVRIN • 4-dB volume control inputs 1 RVRIN • These inputs must be driven from low-impedance circuits. Continued on next page. No. 5588-7/21 LC75373E Continued from preceding page. Pin No. Symbol 34 LSELO 44 RSELO 38 L1 37 L2 36 L3 Function • Outputs from the input selector 35 L4 40 R1 41 R2 42 R3 43 R4 39 VDD Power supply connection 15 VSS Ground 18 CE Chip enable. Data is latched internally at the point this pin goes from high to low. The analog switches operate at that point. Data transfer is enabled when this pin is high. 16 CL 17 DI 32 LCOM 2 RCOM Note • Signal inputs Inputs for the serial data and clock used for LSI control. 1-dB block common outputs 27 LSIN • Super bass inputs 7 RSIN • These inputs must be driven by low-impedance circuits. 11 RSOUT 23 LSOUT • Super bass outputs No. 5588-8/21 LC75373E Input Block Equivalent Circuit No. 5588-9/21 LC75373E Main Volume Control Equivalent Circuit No. 5588-10/21 LC75373E Tone Control Block Equivalent Circuit No. 5588-11/21 LC75373E Super Bass Block Equivalent Circuit Note: Concerning super bass switching control • If the Q for super bass 1 (Type GEQ) is to be set to a relatively large value SW1.............on (Note that this switch should be set to the off position only if STEP 0 data was sent.) SW2.............on SW3.............off SW4.............off • If the Q for super bass 2 (Type T) can be set to a relatively small value without problem SW1.............off SW2.............off SW3.............on SW4.............on No. 5588-12/21 LC75373E Super Bass Block Circuit 1 External Capacitor Calculation Example The LC75373E external capacitors function as the structural elements for simulated inductances. This section presents the equivalent circuits and the formulas used to calculate the desired center frequencies. Simulated Inductance Equivalent Circuit Sample Calculations Specifications: Center frequency: F0 = 100 Hz Q at maximum boost: Qmax = 1.05 ① Determine the sharpness Q0 of the simulated inductance itself. Q0 = (RT2 + Rfeed) RT2 * Qmax ≈ 2.6481 ➁Determine C1. C1 = 1 2* π * F0 * RT2 * Q0 ≈ 0.60 (µF) ➂ Determine C2 C2 = Q0 2* π * F0 * RT3 ≈ 0.014 (µF) *: See the super bass block equivalent circuit diagram for the values of the internal resistors. No. 5588-13/21 LC75373E Fader Volume Control Block Equivalent Circuit No. 5588-14/21 LC75373E Control System Timing and Data Format The LC75373E is controlled by applying serial data in the stipulated format to the CE, CL, and DI pins. The data consists of 52 bits, of which 8 bits are the chip address and 44 bits are the data. Note: 1. The bits D36 to D43 are LSI test bits and must be set to 0. 2. Concerning super bass switching If the Q for super bass 1 is to be set to a relatively large value If the Q for super bass 2 can be set to a relatively small value without problem No. 5588-15/21 LC75373E No. 5588-16/21 LC75373E No. 5588-17/21 LC75373E No. 5588-18/21 LC75373E Super bass 1 Type GEQ, control characteristics Super bass 2 Type T, control characteristics No. 5588-19/21 Total harmonic distortion, THD—% LC75373E THD-Output THD—Outputlevel level characteristics characteristics THD-Output characteristics THD—Input level level characteristics 1 0.1 0.01 -40 -30 -20 -10 0 10 20 30 VDD=8V, VSS=0V 80-kHz low-pass weighting overall 0.1 f=2 0kH z f=1kHz Total Totalharmonic harmonicdistortion, distortion, THD—% THD-% VDD=8V, VSS=0V 80-kHz low-pass weighting overall f=2 0kH z f=1kHz Total Totalharmonic harmonicdistortion, distortion,THD—% THD-% 1 0.01 -40 -30 Output —dBV Outut level, leve, VVOO–dBV Gain block VR 10dB block VR 1dB block TONE block Super bass block -20 -10 0 10 20 30 Input —dBV Oututlevel, leve, V VIN–dBV Fader block THD meter Gain block VR 10dB block VR 1dB block TONE block Super bass block Fader block THD meter No. 5588-20/21 LC75373E Usage Notes 1. The states of the internal analog switches are undefined when power is first applied. Use an external muting circuit or other technique to mute the outputs until correct control data has been set up in the LC75373E. 2. Either cover the lines connected to the CL, DI, and CE pins with the ground pattern or use shielded cable for those lines to prevent the high-frequency digital signals on those lines from entering the analog system. ■ 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 February, 1998. Specifications and information herein are subject to change without notice. PS No. 5588-21/21