SANYO LC75383E

Ordering number : EN5002A
CMOS LSI
LC75383E
Electronic Volume Control
for Car Audio Systems
Overview
Package Dimensions
The LC75383E is an electronic volume control that
provides volume, balance, fader, bass/treble, input
switching and input level controls. The LC75383E
supports all these functions while requiring a minimum
number of external components.
unit: mm
3159-QFP64E
[LC75383E]
Features
• Volume: 0 dB to –79 dB (in 1 dB steps) and –∞;
81 positions.
A balance function can be implemented using the
LC75383E independent left and right volume control
functions.
• Fader: The rear channels or the front channels can be
attenuated over 16 positions: from 0 dB to –20 dB in
2 dB steps, from –20 dB to –25 dB in one 5 dB step,
from –25 dB to –45 dB in 10 dB steps, –60 dB, and –∞
for a total of 16 positions.
• Bass/treble: The LC75383E supports 21 position bass
and treble controls using external capacitors.
• Input selector: The LC75383E can select one of four
L/R inputs. The selected input signal can be amplified
from 0 dB to +18 dB in 6 dB steps.
• Built-in operational amplifiers mean that few external
components are required.
• Silicon gate process for minimal switching noise.
• All controls can be set from serial input data (CCB).
SANYO: QIP64E
• 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.
Specifications
Absolute Maximum Ratings at Ta = 25°C, VSS = 0 V
Parameter
Maximum supply voltage
Symbol
Conditions
Ratings
VDD max
VDD
Maximum input voltage
VIN max
CL, DI, CE, LTIN, RTIN, L10dBIN, R10dBIN, L1dBIN,
R1dBIN, LFIN, RFIN, L1 to L4, R1 to R4
Allowable power dissipation
Pd max
Ta ≤ 85°C
Unit
12
V
VSS – 0.3 to VDD + 0.3
V
310
mW
Operating temperature
Topr
–40 to +85
°C
Storage temperature
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
N2095HA (OT)/62895HA (OT) No. 5002-1/17
LC75383E
Allowable Operating Ranges at Ta = 25°C, VSS = 0 V
Parameter
Symbol
Conditions
min
typ
max
Unit
Supply voltage
VDD
VDD
6.0
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
LTIN, RTIN, L10dBIN, R10dBIN, L1dBIN, R1dBIN,
LFIN, RFIN, L1 to L4, R1 to R4
VSS
VDD
Vp-p
tøW
Input pulse width
CL
1
µs
Setup time
tSETUP
CL, DI, CE
1
µs
Hold time
tHOLD
CL, DI, CE
1
Operating frequency
fopg
µs
CL
500
kHz
max
Unit
Electrical Characteristics at Ta = 25°C, VDD = 9 V, VSS = 0 V
Parameter
Symbol
Conditions
min
typ
[Input Block]
Input resistance
Rin
L1, L2, L3, L4, R1, R2, R3, R4
1
Clipping level
Vcl
LSELO, RSELO: THD = 1.0%
2.35
RL
LSELO, RSELO
Output load resistance
MΩ
Vrms
10
kΩ
Minimum input gain
Gin min
–2
0
+2
dB
Maximum input gain
Gin max
+16.0
+18.0
+20.0
dB
Step resolution
Gstep
+6.0
dB
[Volume Block]
Input resistance
Step resolution
Step error
Rv10
L10dBIN, R10dBIN: 10 dB steps
Rv1
L1dBIN, R1dBIN: 1 dB steps
21
35
49
kΩ
6
10
14
kΩ
ATstep
ATerr
1
dB
Step = 0 to –40 dB, –40 to –60 dB
–1
0
+1
dB
LFIN, RFIN
12
20
28
kΩ
[Fader Volume Block]
Input resistance
Step resolution
Rfed
ATstep
Step = 0 to –20 dB
2
dB
Step = –20 to –25 dB
5
dB
Step = –25 to –45 dB
Step error
Output load resistance
10
ATerr
Step = 0 to –40 dB, –40 to –60 dB
–2
RL
LFOUT, LROUT, RFOUT, RROUT
10
0
dB
+2
dB
kΩ
[Bass/Treble Control Block]
Control range
Gbass
Gtre
Max. boost/cut
±15
±17
±19
dB
Step resolution
Bstep
0.7
1.7
2.7
dB
Internal feedback resistance
Rfeed
46
76
107
kΩ
%
[Overall]
Total harmonic distortion
Crosstalk
Maximum attenuation
Output noise voltage
THD (1)
VIN = 300 mVrms, f = 1 kHz, all controls flat overall
0.005
0.01
THD (2)
VIN = 300 mVrms, f = 20 kHz, all controls flat overall
0.008
0.02
CT
VIN = 1 Vrms, f = 1 kHz, all controls flat overall, Rg = 1 kΩ
60
84.5
–65
–80
%
dB
Vo min
VIN = 1 Vrms, f = 1 kHz, main volume at –∞
VN (1)
All controls flat overall (IHF-A), Rg = 1 kΩ
5.2
12
µV
VN (2)
All controls flat overall (DIN-AUDIO), Rg = 1 kΩ
7.2
16
µV
VN (3)
All controls flat overall (NO-FILTER), Rg = 1 kΩ
9.2
20
µV
VN (4)
Gv = +18 dB (IHF-A), Rg = 1 kΩ
23
50
µV
VN (5)
Bass = max. boost, treble = max. boost (IHF-A), Rg = 1 kΩ
48
120
µV
28
33
mA
10
µA
Current drain
IDD
VDD – VSS = 11 V
Input high level current
IIH
CL, DI, CE, VIN = 9 V
Input low level current
IIL
CL, DI, CE, VIN = 0 V
–10
dB
µA
No. 5002-2/17
LC75383E
Equivalent Circuit Block Diagram
No. 5002-3/17
LC75383E
Electrical Characteristics Test Circuits
1. Total Harmonic Distortion
No. 5002-4/17
LC75383E
2. Output Noise Voltage
No. 5002-5/17
LC75383E
3. Crosstalk
No. 5002-6/17
LC75383E
Pin Assignment
Pin Functions
Pin No.
Symbol
58
LROUT
60
LFOUT
55
RROUT
53
RFOUT
Function
Note
Fader block outputs. Only the front or rear channels are attenuated. The left
and right attenuations are identical.
Since these are operational amplifier outputs, the output is low impedance.
61
LFIN
Fader block inputs.
52
RFIN
Must be driven by low impedance circuits.
64
LVref
49
RVref
Common connections for the main volume, fader block, tone block and gain
control block.
56
Vref
Capacitors of about 100 µF must be inserted between Vref and AVSS (VSS) to
reduce power supply ripple in the VDD/2 voltage generation block.
Continued on next page.
No. 5002-7/17
LC75383E
Continued from preceding page.
Pin No.
Symbol
6
L1dBOUT
43
R1dBOUT
Function
Main volume 1 dB step attenuator outputs
8
L1dBIN
Main volume 1 dB step attenuator inputs
41
R1dBIN
Must be driven by low impedance circuits.
9
L10dBOUT
40
R10dBOUT
Note
Main volume 10 dB step attenuator outputs
11
L10dBIN
Main volume 10 dB step attenuator inputs
38
R10dBIN
Must be driven by low impedance circuits.
62
LTOUT
51
RTOUT
4
LT1
3
LT2
2
LT3
45
RT1
46
RT2
47
RT3
1
LT4
48
RT4
63
LT5
50
RT5
Unnecessary frequencies can be excluded by inserting capacitors of desired
values between the T5 and TOUT pin pairs.
5
LTIN
Tone control circuit inputs
44
RTIN
Must be driven by low impedance circuits.
Tone control outputs
Connections for the capacitors that form the low frequency (bass) tone control
filters
Low frequency compensation capacitors must be connected between T1 and
T2 and between T2 and T3.
Connections for the capacitors that form the high frequency (treble) tone control
filters
High frequency compensation capacitors must be connected between the T4
pins and Vref.
Inverting inputs for the operational amplifiers that form the tone control circuit
filters
Continued on next page.
No. 5002-8/17
LC75383E
Continued from preceding page.
Pin No.
Symbol
57
VDD
27
A. VSS
22, 26
VSS
21
L1
19
L2
17
L3
15
L4
28
R1
30
R2
32
R3
34
R4
12
LSELO
37
RSELO
25
CE
24
DI
23
CL
13
LV1
36
RV1
7, 10,
14, 16,
18, 20,
29, 31,
33, 35,
39, 42,
54, 59
NC
Function
Note
Power supply
Ground for internal operational amplifiers
Ground for the internal logic system
Audio signal inputs
Input selector outputs
Chip enable. Data is written to the internal latch when this pin goes from high to
low. The analog switches operate at that point also. Data transfer is enabled
when this pin is high.
Serial data and clock pins for IC control
Test pins. These pins must be left open.
No connection pins. These pins must be left open or tied to VSS.
No. 5002-9/17
LC75383E
Equivalent Circuit Details
Input Block Equivalent Circuit
10 dB Step Volume Control Equivalent Circuit
No. 5002-10/17
LC75383E
1 dB Step Volume Control Equivalent Circuit
Tone Block Equivalent Circuit
No. 5002-11/17
LC75383E
Sample Calculation for the Tone Block External Capacitors
The external capacitors used with the LC75383E are the structural components in semiconductor inductors, i.e.,
simulated inductors. Here we present the equivalent circuit and the formulas required to acquire the desired center
frequency.
1. Semiconductor inductor equivalent circuit
2. Sample calculation
Specifications: 1) Center frequency: Fo = 100 Hz
2) Q at maximum boost: Qmax = 1.05
• Derive the sharpness, Qo, of the semiconductor inductor itself
Qo =
(RT4 + Rfeed)
× Qmax ≈ 2.6481
RT4
• Calculate C1
C1 = 1/2πFoRT4Qo ≠ 0.60 (µF)
• Calculate C2
C2 =Qo/2πFoRT3 ≠ 0.014 (µF)
Note: See the tone block equivalent circuit for the internal resistance.
Technique for Reducing Noise in the Tone Circuit Output
The output noise can be improved by about 6 dB by providing an external impedance at resonance of Zo and adding
the capacitor C3 with a value of about 100 pF. An even larger noise reduction effect can be acquired by using a low
noise operational amplifier in the external circuit.
No. 5002-12/17
LC75383E
Fader Volume Control Equivalent Circuit
When the main volume 1dBSTEP setting is set to the data value for –∞, S1 and S2 will be open and at the same time S3
and S4 will be on.
No. 5002-13/17
LC75383E
Control System Timing and Data Format
The LC75383E is controlled by inputting the stipulated serial data to the CE, CL and DI pins. The data structure consists
of a total of 40 bits, of which 8 bits are address and 32 bits are setting data.
No. 5002-14/17
LC75383E
Sample Application Circuit
Usage Notes
1. The states of the internal analog switches are undefined when power is first applied. Muting should be applied
externally until control data has been transferred and stored.
2. The signal lines for the CL, DI and CE pins should either be covered by the pattern ground or be formed from
shielded cable to prevent the high-frequency digital signals transmitted over these lines from entering the analog
system.
No. 5002-15/17
LC75383E
No. 5002-16/17
LC75383E
■ 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, 1997. Specifications and information herein are subject to
change without notice.
No. 5002-17/17