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PDF UPC1857ACT Data sheet ( Hoja de datos )
| Número de pieza | UPC1857ACT | |
| Descripción | SOUND CONTROL IC WITH SURROUND AND I2C BUS | |
| Fabricantes | NEC | |
| Logotipo |  |
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DATA SHEET
BIPOLAR ANALOG INTEGRATED CIRCUIT
µPC1857A
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
µPC1857ACT 30-pin plastic shrink DIP (400 mil)
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
1 page  
PIN CONFIGURATION (Top View)
30-pin plastic shrink DIP (400 mil)
AGND
FC1
FC2
FC3
FC4
LF2
RTC
RBC
LTC
LBC
OFR1
OFR2
Rout
Lout
VCC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
1
2
VCC
ADS
AGND
BAL-C
DGND
FC1-FC4
LBC
LF1, LF2
Lin
Lout
LTC
MFI
: Reference Voltage Filter
: Slave Address Select
: Analog Ground
: Balance Control Offset Absorption
: Ground for I2C Bus
: Phase Shift Filter
: L-channel Bass Capacitor
: Low-pass Filter
: L-channel Signal Input
: L-channel Signal Output
: L-channel Treble Capacitor
: Monaural Filter Input
µPC1857A
30 MFI
29 MFO
28 LF1
27 Rin
26 Lin
25 MIX
24
1
2
VCC
23 DGND
22 ADS
21 SDA
20 SCL
19 OFL1
18 OFL2
17 VOL-C
16 BAL-C
MFO
MIX
OFL1, OFL2
OFR1, OFR2
RBC
Rin
Rout
RTC
SCL
SDA
VCC
VOL-C
: Monaural Filter Output
: Mixer Input
: L-channel Offset Absorption
: R-channel Offset Absorption
: R-channel Bass Capacitor
: R-channel Signal Input
: R-channel Signal Output
: R-channel Treble Capacitor
: Serial Clock for I2C Bus
: Serial Data for I2C Bus
: Power Supply
: Volume Control Offset Absorption
5
5 Page 
Pin Number
17
Pin Name
VOL-C
Table 1-1. Pin Function List (5/7)
Equivalent Circuit
VCC
VCC
+ 17
3.3 µF
50 k
µPC1857A
Description
Pin for D/A converter capacitor for
volume control.
Pin voltage: approx. 6.0 V
18 OFL2
VCC
18
1/2VCC
60 k
3k
3k
Pin that absorbs offset voltage of L
channel.
Pin voltage: approx. 6.0 V
VCC
5k
+ 2.2 µF VCC
19 OFL1
6k 6k
19
5k
5k
20 SCL
21 SDA
5 kΩ
20
5 kΩ
21
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
22 ADS
23 DGND
5 kΩ
22
15
1
Slave address select pin.
Pin voltage: approx. 0.0 V
GND for I2C bus signal.
Pin voltage: approx. 0.0 V
23
Remark Pin voltage is the reference value when VCC = 12 V.
11
11 Page | ||
| Páginas | Total 44 Páginas | |
| PDF Descargar | [ Datasheet UPC1857ACT.PDF ] | |
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