LC7537

Ordering number : EN5588 CMOS LSI LC75373E Electronic Volume Control for Car Stereo Systems Overview 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. Package Dimensions 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. 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. Features • 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 Maximum supply voltage Maximum input voltage Operating temperature Storage temperature Symbol VDD max VIN max Topr Tstg VDD CL, DI, CE Conditions Ratings 11 VSS – 0.3 to VDD + 0.3 –40 to +85 –50 to +125 Unit V V °C °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 Parameter Supply voltage Input high-level voltage Input low-level voltage Input voltage amplitude Input pulse width Setup time Hold time Operating frequency Symbol VDD VIH VIL VIN tøW tsetup thold fopg VDD CL, DI, CE CL, DI, CE CL, DI, CE, LVRIN, RVRIN, L1 to L4, R1 to R4 LFIN, RFIN, LSIN, RSIN CL CL, DI, CE CL, DI, CE CL Conditions min 6.0 4.0 VSS VSS 1 1 1 500 typ max 10.5 VDD 1.0 VDD Unit V V V Vp-p µs µs µs kHz Electrical Characteristics at Ta = 25°C, VDD = 8 V, VSS = 0 V Parameter [Input Block] Maximum input gain Step resolution [Output Block] Maximum output gain [Volume Control Block] Step resolution Step error [Fader Volume Block] step =0 to –20 dB step = –20 to –25 dB step = –25 to –45 dB Step error Output load resistance [Bass/Treble Control Block] Bass control range Treble control range [Super Bass Block 1 (Type GEQ)] Control range Step resolution [Super Bass Block 2 (Type T)] Control range Step resolution [Overall Characteristics] Total harmonic distortion Crosstalk Output at maximum attenuation Output noise voltage Input high-level current Input low-level current THD CT VO min V N1 VN2 IIH IIL VIN = 1 Vrms, f = 1 kHz, all settings flat overall VIN = 1 Vrms, f = 1 kHz, all settings flat overall, Rg = 1 kΩ VIN = 1 Vrms, f = 1 kHz, main volume at –∞ All settings flat overall (IHF-A), Rg = 1 kΩ All settings flat overall (DIN-AUDIO), Rg = 1 kΩ CL, DI, CE: VIN = 8 V CL, DI, CE: VIN = 0 V –10 0.003 80.5 –80 8 10 10 0.01 % dB dB µV µV µA µA Crange ATstep Max. boost +20 +2.0 dB dB Crange ATstep Max. boost +17 +1.7 dB dB Gbass Gtre Max. boost/cut Max. boost/cut ±9 ±8 ±10.5 ±10.5 ±12 ±13 dB dB ATerr RL step = 0 to –45 dB step = –45 to –60 dB –2 –3 10 2 5 10 0 0 +2 +3 dB dB kΩ ATstep ATerr step = 0 to –20 dB step = –20 to –50 dB –1 –3 1 0 0 +1 +3 dB dB dB Gout max +6.5 dB Gin max Gstep +18.75 +1.25 dB dB Symbol Conditions min typ max Unit Step resolution ATstep dB 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 Function Note 19 Vref • 1/2 VDD voltage generation block. A capacitor must be connected between Vref and VSS to suppress power supply ripple. 20 21 14 13 LROUT LFOUT RROUT RFOUT • Fader outputs. The front and rear systems can be attenuated independently. 22 12 LFIN RFIN • Fader inputs • Must be driven from low-impedance circuits. 28 6 LTOUT RTOUT • Tone control outputs 31 30 29 3 4 5 LT1 LT2 LT3 RT1 RT2 RT3 • 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. 26 25 24 8 9 10 LS1 LS2 LS3 RS1 RS2 RS3 • Super bass compensation capacitors 33 1 LVRIN RVRIN • 4-dB volume control inputs • 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 Function Note 34 44 LSELO RSELO • Outputs from the input selector 38 37 36 35 40 41 42 43 39 15 L1 L2 L3 L4 R1 R2 R3 R4 VDD VSS Power supply connection Ground 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. • Signal inputs 18 CE 16 17 32 2 27 7 11 23 CL DI LCOM RCOM LSIN RSIN RSOUT LSOUT Inputs for the serial data and clock used for LSI control. 1-dB block common outputs • Super bass inputs • These inputs must be driven by low-impedance circuits. • 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 x Determine the sharpness Q0 of the simulated inductance itself. Q0 = (RT2 + Rfeed) RT2 * Qmax ≈ 2.6481 Determine C1. C1 = 1 2* π * F0 * RT2 * Q0 ≈ 0.60 (µF) Ž 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 LC75373E Total harmonic distortion, THD—% THD-Output level characteristics THD—Output level characteristics 1 1 THD-Output level characteristics THD—Input level characteristics Total harmonic distortion, THD—% Total harmonic distortion, THD-% VDD=8V, VSS=0V 80-kHz low-pass weighting overall 0.1 f=2 0kH z f=1kHz Total harmonic distortion, THD—% Total harmonic distortion, THD-% VDD=8V, VSS=0V 80-kHz low-pass weighting overall 0.1 f=2 0kH z f=1kHz 0.01 0.01 -40 -30 -20 -10 0 10 20 30 -40 -30 -20 -10 0 10 20 30 Output level,VO–dBV Outut leve, VO—dBV Gain block VR 10dB block VR 1dB block TONE block Super bass block Fader block THD meter Gain block VR 10dB block Input level, VIN–dBV Outut leve, V —dBV 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. s 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. s Anyone purchasing any products described or contained herein for an above-mentioned use shall: Œ 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:  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. s 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