lc75421m

Manufacturer Part Numberlc75421m
DescriptionElectronic Volume Controller For Cars
ManufacturerSanyo Semiconductor Corporation
lc75421m datasheet
 


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Ordering number : ENN6866A
Overview
The LC75421M is an electronic volume controller that
enables control of volume, balance, fader, bass/treble +
super bass, input switching, and input and output level
control functions using only a small number of external
components.
Functions
• Volume: 0 dB to –79 dB in 1-dB steps, and –∞ (81 positions)
Balance function with separate L/R control
• Fader: rear output or front output can be attenuated
across 16 positions (in 2-dB steps from 0 dB to -
20 dB, 5-dB steps from –20 dB to –25 dB, 10-dB
steps from –25 dB to –45 dB, and –60 dB, –∞)
• Bass/treble: A tone control circuit can be configured
using an external RC, with 15-position
control from 0 dB to ±11.9 dB in 1.7-dB
steps possible for both bass and treble
• Input gain: 0 dB to +18.75 dB (1.25-dB steps)
amplification is possible for the input signal.
• Output gain: Fader output can be selected among 0 dB,
+6.5 dB, and +8.5 dB.
• Input switching: Five input signals can be selected for
Left and for Right
• Super bass: Step control with 11 positions is possible,
with peaking characteristics (type T)
• 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.
Any and all SANYO products described or contained herein do not have specifications that can handle
applications that require extremely high levels of reliability, such as life-support systems, aircraft’s
control systems, or other applications whose failure can be reasonably expected to result in serious
physical and/or material damage. Consult with your SANYO representative nearest you before using
any SANYO products described or contained herein in such applications.
SANYO assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other
parameters) listed in products specifications of any and all SANYO products described or contained
herein.
SANYO Electric Co.,Ltd. Semiconductor Company
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
Electronic Volume Controller for Cars
Features
• On-chip buffer amplifier cuts down number of external
components
• Low switching noise generated by on-chip switch due to
use of silicon gate CMOS process
• On-chip reference voltage circuit for analog ground
• Controls performed with serial input (CCB)
Package Dimensions
unit: mm
3263-MFP36SDJ (375 mil)
[LC75421M]
15.2
36
1
0.8
0.3
(0.8)
90503TN (OT) / 20901RM (OT) No. 6866-1/24
CMOS IC
LC75421M
19
18
0.25
SANYO: MFP36SDJ (375 mil)

lc75421m Summary of contents

  • Page 1

    ... Ordering number : ENN6866A Overview The LC75421M is an electronic volume controller that enables control of volume, balance, fader, bass/treble + super bass, input switching, and input and output level control functions using only a small number of external components. Functions • Volume – 1-dB steps, and –∞ (81 positions) Balance function with separate L/R control • ...

  • Page 2

    ... Pin Assignment VSS 3 LROUT 4 LFOUT 5 LFIN 6 LOUT 7 LSB 8 LBASS2 9 LBASS1 10 LTRE 11 LIN 12 LSELO LC75421M LC75421M VDD 34 RROUT 33 RFOUT 32 RFIN 31 ROUT 30 RSB 29 RBASS2 28 RBASS1 27 RTRE 26 RIN 25 RSELO Vref Top view ...

  • Page 3

    ... Equivalent Circuit Block Diagram 4 LROUT 5 LFOUT LFIN LOUT 7 0.15 F 0. LSB LBASS2 9 0.082 F 0.082 F 7. LBASS1 1500 pF 11 LTRE 12 LIN LSELO 14 LC75421M RROUT 33 RFOUT RFIN ROUT 31 0.15 F 0. RSB RBASS2 29 0.082 F 0.082 F 28 RBASS1 ...

  • Page 4

    ... Symbol Input resistance Rin Fader Volume Block Parameter Symbol Step resolution ATstep Step error ATerr Output load resistance RL Output impedance R O LC75421M = Symbol Conditions V max CE, DI max IN Input pins other than CE, DI ≤ 85°C, when mounted on board ...

  • Page 5

    ... Total harmonic distortion THD Crosstalk CT Maximum attenuated output Vomin VN-1 Output noise voltage VN-2 Input high-level current I IH Input low-level current I IL LC75421M Pin Name Conditions MAX. Boost/Cut Pin Name Conditions MAX. Boost/Cut Pin Name Conditions MAX. Boost Conditions Vrms kHz, flat overall Vrms kHz, flat overall kΩ ...

  • Page 6

    ... Control Timing and Data Format To control the LC75421M, input specified serial data to the CE, CL, and DI pins. The data configuration consists of a total of 52 bits broken down into 8 address bits and 44 data bits ...

  • Page 7

    ... LC75421M D20 D21 D22 D23 Operation ...

  • Page 8

    ... Input Switch Control (L1, L2, L3, L4, L5, R1, R2, R3, R4, R5) D28 D29 D32 Operation (R1 (R2 (R3 (R4 (R5) ON LC75421M D20 D21 D22 D23 Operation ...

  • Page 9

    ... ROUT 5 LFOUT • Fader output pins. The front side and rear side can be 4 LROUT attenuated separately. The attenuation is the same for both 33 RFOUT Left and Right. 34 RROUT LC75421M Function Ln Rn BASS1 Equivalent circuit VDD VDD SELO Vref VDD VDD VDD ...

  • Page 10

    ... Data is written to the internal latch and the analog switches 2 CE are operated when the level changes from High to Low. Data transfer is enabled when the level is High • Serial data pin and clock input pin for control 36 CL LC75421M Function ) as a analog ground 0.5 V voltage SS DD Equivalent circuit VDD TRE ...

  • Page 11

    ... Equivalent Circuit Input Block Diagram LC75421M 0 dB +1.25 dB +2. +3. +5.00 dB +6.25 dB +7.50 dB +8.75 dB +10.00 dB +11.25 dB +12.50 dB +13.75 dB +15.00 dB +16.25 dB +17.50 dB +18.75 dB Same for right channel Unit: (Resistance: ) LSEL0 6.702 k 5.804 k TOTAL = 50 k 5.026 k 4.352 k 3.769 k 3.264 k 2.826 k 2.447 k 2.119 k 1.835 k 1.589 k 1 ...

  • Page 12

    ... R22 = 485 –22 dB R23 = 432 –23 dB R24 = 385 –24 dB R25 = 343 –25 dB R26 = 306 –26 dB R27 = 273 –27 dB 794 R81 LC75421M R28 = 243 –28 dB R29 = 216 –29 dB R30 = 193 –30 dB R31 = 172 –31 dB R32 = 153 –32 dB R33 = 137 –33 dB R34 = 122 – ...

  • Page 13

    ... SW1 Same for right channel Unit: (Resistance: ) LTRE Total = 56.084 k Total = 66.6 k LSB During boost, SW1 and SW3 are ON, during cut, SW2 and SW4 are ON, when 0 dB and SW2 and SW3 are ON. LC75421M SW3 SW2 SW4 LBASS1 LOUT SW3 SW2 SW1 SW4 Total = 45 ...

  • Page 14

    ... LVref When – data is sent to the main volume, S1 and S2 become open, and S3 and S4 simultaneously become ON. LC75421M LFOUT +6.5 dB +8.5 dB When FADER = “1”, S2 and S3 are ON When FADER = “0”, S1 and S4 are ON LROUT 26 ...

  • Page 15

    ... Let us use 66.6 kΩ, and obtain R3 from dB LOG 1 + 2R3 R2 66600 R3 2 (10 – 1) G+20dB/ –1 We obtain C from mean frequency Hz R3R2C1C2 R3R2 2 68 66600 3700 We obtain Q. R3R2 1 Q 2.1 2R3 R3R2 LC75421M 3.7 K 0.15 F No. 6866-15/24 ...

  • Page 16

    ... G 20 LOG – R1 G/20 10 – 45054 2 10000 ( ) 2 – 11030 5.01–1 Simulation Results Setting kHz kHz 14 dB 13.95 7. 11. 1.64 LC75421M 6800(pF) 2 No. 6866-16/24 ...

  • Page 17

    ... The above constants are inserted in the following formula LOG – R1 11.9/20 10 – 45054 2 2 10000 ( ) – 11030 3.94–1 Simulation Results Setting kHz kHz 11.9 dB 11.92 0.00 10.2 dB 10.64 0.00 8.5 dB 9.17 0.00 6.8 dB 7.52 0.00 5.1 dB 5.74 0.00 3.4 dB 3.88 0.00 1.7 dB 1.96 0.00 LC75421M = 11 11 1500(pF) 2 No. 6866-17/24 ...

  • Page 18

    ... We obtain C2 from mean frequency Hz R3R2C1C2 f0) R2R3 C1 (2 40) Simulation Results Setting f = 100 kHz 14 dB 13.55 3. 11.73 3. 9 5.94 2. 3.97 1. 1.99 1.07 LC75421M –6 45054 11000 (2 0.015 F No. 6866-18/24 ...

  • Page 19

    ... G 20 LOG + 45054 G/20 3.98 – –1 We obtain C2 from mean frequency Hz R3R2C1C2 f0) R2R3 C1 (2 40) Simulation Results Setting f = 100 kHz 14 dB 11.73 4. 10.29 4. 8.74 3. 7.11 3. 5.41 2. 3.65 2. 1.85 1.15 LC75421M 1 0. –6 45054 15000 (2 No. 6866-19/24 ...

  • Page 20

    ... We obtain C from mean frequency f0 = 100 Hz R3R2C1C2 R3R2 2 100 45084 7680 We obtain Q. R3R2 1 Q 1.66 • 2R3 R3R2 Simulation Results Setting f = 100 kHz 11.9 dB 11.88 0.00 10.2 dB 10.38 0.00 8.5 dB 8.79 0.00 6.8 dB 7.14 0.00 5.1 dB 5.42 0.00 3.4 dB 3.66 0.00 1.7 dB 1.85 0.00 LC75421M 7.68 K 0.082 F No. 6866-20/24 ...

  • Page 21

    ... When performing initial data setting after applying power, send the initial data once, and then send the initial setting data. (3) To ensure that the digital frequency signal sent to the CL, DI, and CE pins do not spill over to the analog signal block, either guard these signal lines with a ground pattern, or perform transmission using shielded wires. LC75421M No. 6866-21/24 ...

  • Page 22

    ... Main Volume Control Step Characteristics Step setting — dB Fader Step Characteristics Step setting — dB LC75421M Input Gain Step Characteristics Step setting — dB THD — Frequency Characteristics Frequency, f — Hz THD METER No. 6866-22/24 ...

  • Page 23

    ... THD — Input Level Characteristics Input level, V — dBV IN Bass Control Characteristics Frequency, f — Hz Super Bass Characteristics Frequency, f — Hz LC75421M THD — Supply Voltage Characteristics THD METER Treble Control Characteristics Supply voltage — V THD METER Frequency, f — Hz No. 6866-23/24 ...

  • Page 24

    ... 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 September, 2003. Specifications and information herein are subject to change without notice. LC75421M PS No. 6866-24/24 ...