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參數(shù)資料
| 型號： | LX1800ILD |
| 廠商： | MICROSEMI CORP-ANALOG MIXED SIGNAL GROUP |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, DSO8 |
| 封裝： | ROHS COMPLIANT, PLASTIC, MLP-8 |
| 文件頁數(shù)： | 9/10頁 |
| 文件大小： | 167K |
| 代理商： | LX1800ILD |
LX1800
PRODUCTION DATA SHEET
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 8
Copyright
2004
Rev. 1.0, 2006-01-05
WWW
.Microse
m
i
.CO
M
SMBus to Analog Interface
TM
APPLICATION CIRCUITS
SCL
SCD
GND
ADR
VDD
REF
AIN
AOUT
LX1800
To P
Audio In
5V
0.1F
100K
2V
1V
0.1F
100K
Audio Out
Figure 4 – Digital Volume Control with Audio Absent Detection.
TH EORY OF O PERAT ION
BASIC FUNCTIONALITY
The LX1800 contains an 8 bit DAC, an 8 bit ADC and a
SMBus interface which connects the input of the DAC and
the output of the ADC to the SMBus host. The LX1800
contains an internal 2V reference and can also be
configured to use an external reference. Since the 8 bit
DAC is a multiplying type, the external reference can be
used for an analog input for volume control applications.
The ADC contains a sample and hold input that stores the
analog voltage level while the conversion is being
processed.
SMBUS INTERFACE
The LX1800 communicates over the SMBus in the slow
speed Low Power Level and operates in a “slave” mode
receiving commands and sending and receiving data from
the host or bus “master”. The LX1800 can be configured
for one of two addresses, 0101100b when the ADR line is
grounded and 0101101b when the ADR line is connected to
Vcc.
The LX1800 has three internal registers, the Command
register, the DAC register and the ADC register.
The
CMD register is read/write, the DAC register is write only
and the ADC register is read only. Control of the LX1800
are performed through the CMD register.
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