NEC UPC1857ACT Datasheet
DATA SHEET
BIPOLAR ANALOG INTEGRATED CI RCUIT
µµµµ
PC1857A
SOUND CONTROL IC WITH SURROUND AND I2C BUS
DESCRIPTION
The µPC1857A is a sound control IC with I2C bus.
It has functions to control volume, balance, and tone, and a phase shift matrix surround function.
The surround function achieves wide sound expansion using only two front speakers. Three modes can be
selected: movie mode that increases the presence of sound with stereo sound input, music mode emphasizing vocal
music, and simulated mode that gives expansion and left and right sound depth with monaural sound input.
The µPC1857A can perform all control (mode switching, volume control and so on) using I2C.
FEATURES
• Volume control function : Attenuation adjustable from 0 to −80 dB in 64 steps
• Balance control function : The difference in attenuation adjustable from 0 to −80 dB in 64 steps
• Tone (bass, treble) control function : Adjustable in 32 steps from +10 to −10 dB
• Surround function (gain adjustable) : Three modes (movie, music, and simulated)
• Mute function
• Mixing function
• Output selection function (for two mono channels input)
• All parameters can be controlled via I2C bus.
APPLICATIONS
• TV, PC monitor
ORDERING INFORMATION
Part Number Package
PC1857ACT 30-pin plastic shrink DIP (400 mil)
µ
The information in this document is subject to change without notice.
Document No. S12453EJ1V1DS00 (1st edition)
Date Published March 1998 N CP(K)
Printed in Japan
1997©
SYSTEM BLOCK DIAGRAM
TV
••••
µµµµ
PC1857A
PD17052
µ
µ
PD17053
PC2800A
µ
Tuner PIF & SIF
DTS interface
µ
PC1854
(US-MTS)
Tuning
microcontroller
Remote control
reception amplifier
PIN photo diode
MTS
decoder
Color, intensity, and
deflecting signal
processor
PC1857A
µ
L
Surround
R
I2C bus interface
Volume
Balance
Tone
RGB
output
Vertical
output
Horizontal
output
Power
amplifier
µ
PC1316C
CRT
Speaker
L
R
Remark
DTS: Digital Tuning System
MTS: Multichannel Television Sound
2
• PC monitor
Sound input
L
R
Signal input
R
G
B
RGB
input
processor
PC18757A
µ
Surround
2
C bus interface
I
Video
amplifier
Volume
Balance
Tone
RGB
drive
Power
amplifier
PC1316C
µ
µµµµ
PC1857A
Speaker
L
R
CRT
V.sync
H.sync
C.sync
Panel
switch
EEPROM
TM
Sync. signal
separator
HD VD
Microcontroller
µ
PD78014Y
Control
H-F/V
OSD
Sync. signal
processor
D/A converter
µ
PC6221
µ
PC1885
µ
PC1883
PLL
Gometry
compensation
Deflection
compensation drive
Vertical
drive
Horizontal
drive
Yoke
High-voltage
unit
3
BLOCK DIAGRAM
820 k
µµ
0.082
MFO
29 30 28 24 23 22 21 20 15 19 18 10
F
680 pF
MFI LF1
+
µµµµ
PC1857A
22
F
1
+
V
CC
DGND
2
ADS SDA SCL
12 V
VCC
2.2+F
µ
OFL1 OFL2
µ
0.047 F
LBC LTC VOL-C
3300 pF
9 17
3.3 F
µ
Lin
+
26
+
µ
2.2 F
+
Rin
+
27
2.2 F
µ
MIX
+
25
µ
2.2 F
-
LPF
-
+
FC1 FC2 FC3 FC4 OFR1 OFR2
µ
0.1 F 0.022 1000 pFF 0.047 3300 pFF 3.3 F
1
V
2
Phase shifter
0.0222200 pF F
CC
Effect
control
µ
µ
I2C bus
interface
L
L + R
+
L +
+
LPFPS1PS2 PS3 PS4
-
+
65432 81211
LF2 AGND RBC RTC BAL-C
Output
select
R
-
R
1
Offset
+
absorption
+
+
+
Offset
absorption
+
2.2 F
µ
Tone
control
Volume,
balance
control/
mute
Tone
control
7 16
+
µ
µ
Lout
14
Rout
13
4
PIN CONFIGURATION (Top View)
30-pin plastic shrink DIP (400 mil)
µµµµ
PC1857A
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
MFI
MFO
LF1
Rin
Lin
MIX
1
CC
V
2
DGND
ADS
SDA
SCL
OFL1
OFL2
VOL-C
BAL-C
1
V
2
CC
AGND
FC1
FC2
FC3
FC4
LF2
RTC
RBC
LTC
LBC
OFR1
OFR2
Rout
Lout
V
CC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
: Reference Voltage Filter MFO : Monaural Filter Output
ADS : Slave Address Select MIX : Mixer Input
AGND : Analog Ground OFL1, OFL2 : L-channel Offset Absorption
BAL-C : Balance Control Offset Absorption OFR1, OFR2 : R-channel Offset Absorption
DGND : Ground for I2C Bus RBC : R-channel Bass Capacitor
FC1-FC4 : Phase Shift Filter Rin : R-channel Signal Input
LBC : L-channel Bass Capacitor Rout : R-channel Signal Output
LF1, LF2 : Low-pass Filter RTC : R-channel Treble Capacitor
Lin : L-channel Signal Input SCL : Serial Clock for I2C Bus
Lout : L-channel Signal Output SDA : Serial Data for I2C Bus
LTC : L-channel Treble Capacitor V
CC
: Power Supply
MFI : Monaural Filter Input VOL-C : Volume Control Offset Absorption
5
µµµµ
PC1857A
CONTENTS
1. PIN FUNCTIONS.............................................................................................................................. 7
2. ATTENTIONS.................................................................................................................................... 14
2
3. I
C BUS INTERFACE...................................................................................................................... 15
3.1 Data Transfer.......................................................................................................................................... 15
3.1.1 Start condition............................................................................................................................ 15
3.1.2 Stop condition............................................................................................................................ 16
3.1.3 Data transfer.............................................................................................................................. 16
3.2 Data Transfer Format............................................................................................................................. 17
3.2.1 1-byte data transfer.................................................................................................................... 18
3.2.2 Successive data transfer............................................................................................................ 18
3.2.3 Acknowledge.............................................................................................................................. 18
4. EXPLANATION OF EACH COMMAND ........................................................................................ 19
4.1 Subaddress List..................................................................................................................................... 19
4.2 Initialization............................................................................................................................................ 20
4.3 Surround Function................................................................................................................................. 20
4.4 Explanation of Each Command............................................................................................................ 21
4.4.1 Mute........................................................................................................................................... 21
4.4.2 Output selection......................................................................................................................... 21
4.4.3 Surround mode .......................................................................................................................... 22
4.4.4 Surround effect .......................................................................................................................... 23
4.4.5 Mix ............................................................................................................................................. 23
4.4.6 Automatic increment.................................................................................................................. 24
4.4.7 Volume level .............................................................................................................................. 25
4.4.8 Balance...................................................................................................................................... 25
4.4.9 Bass level................................................................................................................................... 26
4.4.10 Treble level ................................................................................................................................ 26
5. ELECTRICAL CHARACTERISTICS ............................................................................................... 27
6. CHARACTERISTIC CURVES.......................................................................................................... 33
6.1 Frequency Characteristic in Each Mode.............................................................................................. 33
6.2 Control Characteristic........................................................................................................................... 36
6.3 I/O Characteristic................................................................................................................................... 38
7. PACKAGE DRAWING..................................................................................................................... 39
8. RECOMMENDED SOLDERING CONDITIONS ............................................................................. 40
6
µµµµ
1. PIN FUNCTIONS
Table 1-1. Pin Function List (1/7)
Pin Number Pin Name Equiv al ent Circuit Description
1AGND
2FC1
15
1
23
V
CC
36 k
18 k
3 k 3 k
36 k
V
CC
Ground for analog signal.
Pin voltage: approx. 0. 0 V
Connection pin for capacitor whi ch
determines time constant of phase
shifter.
Pin voltage: approx. 6. 0 V
PC1857A
3FC2
4FC3
V
CC
36 kΩ
18 kΩ
V
CC
36 k
18 k
2
3 kΩ 3 kΩ
36 kΩ
V
CC
3
3 k 3 k
36 k
V
CC
4
0.1 F
µ
2200 pF
Remark
Pin voltage is the reference value when V
CC
= 12 V.
0.022 F
µ
7
Table 1-1. Pin Function List (2/7)
Pin Number Pin Name Equiv al ent Circuit Description
V
5FC4
CC
3 k 3 k
36 k
36 k
18 k
V
CC
5
µ
0.022 F
Connection pin for capacitor whi ch
determines time constant of phase
shifter.
Pin voltage: approx. 6. 0 V
µµµµ
PC1857A
6LF2
7RTC
8RBC
V
CC
17.7 k
17.7 k
VCC
12 k
V
CC
13.8 k
5 k 5 k
V
CC
6
VCC
3 k 3 k
V
CC
1000 pF
3 k 3 k
7
3300 pF
Low-pass filter.
Pin voltage: approx. 6. 0 V
Connection pin for capacitor for
treble boost/cut frequenc y
characteristic of R-channel signal.
Pin voltage: approx. 6. 0 V
Connection pin for capacitor for
bass boost/cut f requenc y
characteristic of R-channel signal.
Pin voltage: approx. 6. 0 V
Remark
8
Pin voltage is the reference value when V
8
0.047 F
CC
= 12 V.
µ
µµµµ
PC1857A
Table 1-1. Pin Function List (3/7)
Pin Number Pin Name Equiv al ent Circuit Description
V
9LTC
CC
Connection pin for capacitor for
treble boost/cut frequenc y
12 k
3 k 3 k
V
CC
9
3300 pF
characteristic of L-channel signal.
Pin voltage: approx. 6. 0 V
10 LBC
VCC
Connection pin for capacitor for
bass boost/cut f requenc y
13.8 k
3 k 3 k
VCC
10
0.047 F
µ
characteristic of L-channel signal.
Pin voltage: approx. 6. 0 V
11 OFR1 Pin that absorbs offset voltage of R
channel.
V
12 OFR2
+
11
µ
2.2 F
12
CC
V
V
5 k
CC
CC
5 k
6 k
1/2V
CC
60 k
5 k
6 k
3 k
3 k
Pin voltage: approx. 6. 0 V
Remark
Pin voltage is the reference value when V
CC
= 12 V.
9
Table 1-1. Pin Function List (4/7)
Pin Number Pin Name Equiv al ent Circuit Description
V
13 Rout
V
CC
2 kΩ
V
CC
CC
3 kΩ
R-channel signal output pin.
Pin voltage: approx. 6. 0 V
µµµµ
PC1857A
14 Lout
15 V
CC
13
14
10 kΩ
2 kΩ
V
CC
V
CC
3 kΩ
L-channel signal output pin.
Pin voltage: approx. 6. 0 V
2 kΩ
V
CC
10 kΩ
2 kΩ
15
Supply voltage.
Pin voltage: approx. 12. 0 V
1
16 BAL-C
Remark
10
23
16
3.3 F
+
µ
Pin voltage is the reference value when V
V
CC
CC
= 12 V.
50 k
V
CC
Pin for D/A convert er capacitor for
balance control.
Pin voltage: approx. 4. 8 V
µµµµ
PC1857A
Table 1-1. Pin Function List (5/7)
Pin Number Pin Name Equiv al ent Circuit Description
V
50 k
3 k
6 k
CC
Pin for D/A convert er capacitor for
volume control.
Pin voltage: approx. 6. 0 V
3 k
channel.
Pin voltage: approx. 6. 0 V
17 VOL-C
V
CC
17
+
µ
3.3 F
18 OFL2 Pin that absorbs offset voltage of L
1/2V
CC
60 k
6 k
19 OFL1
+
2.2 F
18
µ
V
CC
V
CC
V
5 k
CC
20 SCL
21 SDA
22 ADS
19
20
22
21
5 k
5 kΩ
5 kΩ
5 k
Serial clock line (I2C bus clock Input)
pin.
Pin voltage: approx. 0. 0 V
Serial data line (I2C bus data I/O)
pin
Pin voltage: approx. 0. 2 V
5 kΩ
Slave address select pi n.
Pin voltage: approx. 0. 0 V
23 DGND
Remark
Pin voltage is the reference value when V
15
23
GND for I2C bus signal.
Pin voltage: approx. 0. 0 V
1
CC
= 12 V.
11
Table 1-1. Pin Function List (6/7)
Pin Number Pin Name Equiv al ent Circuit Description
24 V
1
2
CC
22+F
µ
24
V
CC
5 k
V
CC
Filter pin for middle point of s uppl y
voltage.
Pin voltage: approx. 6. 0 V
V
CC
20 k
90 k
20 k
µµµµ
PC1857A
25 MIX
26 Lin
27 Rin
2.2 F
µ
µ
2.2 F
25
MIX
26
Lin
1/2V
CC
V
CC
3 k 3 k
60 k
Mixing signal input pin.
Input impedance: 60 kΩ
Pin voltage: approx. 6. 0 V
5 k
+
1/2V
CC
V
CC
3 k 3 k
60 k
L-channel signal input pin.
Input impedance: 60 kΩ
Pin voltage: approx. 6. 0 V
5 k
+
1/2V
CC
V
CC
3 k 3 k
60 k
R-channel signal input pin.
Input impedance: 60 kΩ
Pin voltage: approx. 6. 0 V
Remark
12
27
2.2 F
+
µ
Rin
Pin voltage is the reference value when V
CC
= 12 V.
5 k
µµµµ
PC1857A
Table 1-1. Pin Function List (7/7)
Pin Number Pin Name Equiv al ent Circuit Description
28
18 kΩ
V
29
CC
V
CC
5 kΩ 5 kΩ
1 k
18 k
Low-pass filter.
Pin voltage: approx. 6. 0 V
function (simulated m ode) (see 4.3
Surround Function).
Pin voltage: approx. 6. 0 V
28 LF1
680 pF
29 MFO Filter output pin for surround
30
µ
V
CC
CC
= 12 V.
15 k
47 k
(simulated mode) (see 4.3
Surround Function).
Pin voltage: approx. 6. 0 V
30 MFI Filter input pin for surround function
Remark
Pin voltage is the reference value when V
820 k 0.082 F
13
2. ATTENTIONS
(1) Attention on Pop Noise Reduction
When changing the surround mode, use the mute function (approx. 200 ms) for pop noise reduction (see
).
Mute
When turning ON/OFF power to the
(2) Attention on Supply Voltage
Drive data on the I2C bus after supply voltage of total application system becomes stable.
PC1857A, use the external mute function for pop noise reduction.
µ
µµµµ
PC1857A
4.4.1
14
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