Page 1
Overview
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.
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.
Features
Serial data interface: Support for control and
communication in the CCB format.
Package Dimensions
unit: mm
3196-DIP30SD
unit: mm
3216-MFP30S
CMOS LSI
Ordering number : EN5681
73097HA(OT) No. 5681-1/12
SANYO: DIP30SD
[LC75392]
SANYO: MFP30S
[LC75392M]
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
Single-Chip Electronic Volume Control System
LC75392, 75392M
• 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.
Parameter Symbol Conditions Ratings Unit
Maximum supply voltage V
DD
max V
DD
12 V
Maximum input voltage V
IN
max CL, DI, CE, L1, L2, L3, L4, R1, R2, R3, R4 V
SS
– 0.3 to V
DD
+ 0.3 V
Allowable power dissipation Pd max Ta ≤ 85°C 160 mW
Operating temperature Topr –40 to +85 °C
Storage temperature Tstg –50 to +125 °C
Specifications
Absolute Maximum Ratings at Ta = 25°C, VSS= 0 V
Page 2
No. 5681-2/12
LC75392, 75392M
Parameter Symbol Conditions
Ratings
Unit
min typ max
Supply voltage V
DDVDD
5.5 11.0 V
Input high-level voltage V
IH
CL, DI, CE 4.0 V
DD
V
Input low-level voltage V
IL
CL, DI, CE V
SS
1.0 V
Input voltage amplitude V
IN
L1, L2, L3, L4, R1, R2, R3, R4 V
SS
V
DD
Vp-p
Input pulse width t
øW
CL 1.0 µs
Setup time t
setup
CL, DI, CE 1.0 µs
Hold time t
hold
CL, DI, CE 1.0 µs
Operating frequency fopg CL 500 kHz
Allowable Operating Ranges at Ta = 25°C, VSS= 0 V
Parameter Symbol Conditions
Ratings
Unit
min typ max
[Input Block]
Input resistance Rin L1, L2, L3, L4, R1, R2, R3, R4 500 kΩ
[Overall]
THD1
V
IN
= 100 mV rms, f = 1 kHz,
0.013 %
Total harmonic distortion
overall, buffer mode off, flat state
THD2
VIN= 100 mV rms, f = 20 kHz,
0.013 %
overall, buffer mode off, flat state
Crosstalk CT
VIN= 1 V rms, f = 1 kHz, overall, Rg = 1 kΩ,
81 dB
buffer mode off, flat state
Output at maximum attenuation V
O
min
V
IN
= 1 V rms, f = 1 kHz, main volume set to
–80 dB
–∞, buffer mode on
V
N
1
Flat overall (IHF-A), Rg = 1 kΩ,
15 µV
Output noise voltage
buffer mode off, flat state
VN2
Flat overall (DIN-AUDIO), Rg = 1 kΩ,
22 µV
buffer mode off, flat state
Current drain I
DD
V
DD
– VSS= 11 V 7 10 mA
Input high-level current I
IH
CL, DI, CE, VIN= 10 V 10 µA
Input low-level current I
IL
CL, DI, CE, VIN= 0 V –10 µA
Electrical Characteristics at Ta = 25°C, VDD= 10 V, VSS= 0 V
Equivalent Circuit Block Diagram
Latch
Decoder
Shift register
Control
Page 3
Test Circuit
Total Harmonic Distortion
No. 5681-3/12
LC75392, 75392M
Use circuit
constants identical
to those of the right
channel.
THD in
SG out
Distortion analyzer
Page 4
Output Noise Voltage
No. 5681-4/12
LC75392, 75392M
Use circuit
constants identical
to those of the right
channel.
Noise meter
Page 5
Crosstalk
No. 5681-5/12
LC75392, 75392M
Use circuit
constants identical
to those of the right
channel.
Volt meter
Page 6
Pin Pin No. Function Circuit
Pin Assignment
No. 5681-6/12
LC75392, 75392M
Pin Functions
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
Continued on next page.
Top view
Page 7
Pin Pin No. Function Circuit
No. 5681-7/12
LC75392, 75392M
Continued from preceding page.
L1
L2
L3
L4
R1
R2
R3
R4
12
11
10
9
19
20
21
22
Audio signal inputs and outputs
V
DD
Vref
V
SS
13
18
17
Power supply
Analog system ground
Ground
CL
DI
14
15
Serial data and clock inputs for device control
CE 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.
Page 8
Volume Control Equivalent Circuit
No. 5681-8/12
LC75392, 75392M
Page 9
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.
No. 5681-9/12
LC75392, 75392M
Note: The bits D20, D21, and D22 are IC test mode control data. User applications must always set these bits to 0.
Volume
control data
Tone
pattern
control data
Don’t
care
Don’t
care
Don’t
care
Don’t
care
Don’t
care
Test
mode
Channel
selection
Left and right at the
same time
Function switch
control data
Buffer
mode
1 µs ≤ t
DEST
Page 10
Sample Application Circuit (Three-input type)
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
Use circuit constants
identical to those of
the right channel.
Page 11
No. 5681-11/12
LC75392, 75392M
Main Volume Step Characteristics
THD vs. Frequency Characteristics
THD vs. Input Level Characteristics
THD vs. Power-Supply Voltage Characteristics
Tone Control Characteristics
Main volume attenuation – dB
Total harmonic distortion, THD – %Total harmonic distortion, THD – %
Output level – dB
Total harmonic distortion, THD – %
Steps
Frequency, f – Hz
Frequency, f – Hz
Input level, VIN– dBV
Power-supply voltage, VDD– V
Overall
80 kHz low-pass filter
Overall
80 kHz low-pass filter
Overall
Buffer mode off
Flat
80 kHz low-pass filter
Overall
Buffer mode off
Flat
Page 12
No. 5681-12/12
LC75392, 75392M
This catalog provides information as of July, 1997. Specifications and information herein are subject to change
without notice.
■ 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.
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