參數(shù)資料
型號(hào)： DC745A
廠商： Linear Technology
文件頁(yè)數(shù)： 3/28頁(yè)
文件大?。?/td> 0K
描述： BOARD DELTA SIGMA ADC LTC2433-1
軟件下載： QuikEval System
設(shè)計(jì)資源： DC745A Design File
DC745A Schematic
標(biāo)準(zhǔn)包裝： 1
系列： QuikEval™
ADC 的數(shù)量： 2
位數(shù)： 16
采樣率（每秒）： 6.8
數(shù)據(jù)接口： MICROWIRE?，串行，SPI?
工作溫度： 0°C ~ 70°C
已用 IC / 零件： LTC2433-1
已供物品： 板
相關(guān)產(chǎn)品： LTC2433-1IMS#PBF-ND - IC ADC DIFF 16BIT 3WIRE 10-MSOP
LTC2433-1CMS#TRPBF-ND - IC ADC DIFF 16BIT 3WIRE 10-MSOP
LTC2433-1IMS#TRPBF-ND - IC ADC DIFF 16BIT 3WIRE 10-MSOP
LTC2433-1CMS#PBF-ND - IC ADC DIFF 16BIT 3WIRE 10-MSOP
LTC2433-1IMS#TR-ND - IC CONV A/D 16BIT DIFF 10-MSOP
LTC2433-1CMS#TR-ND - IC CONV A/D 16BIT DIFF 10-MSOP
LTC2433-1IMS-ND - IC CONV A/D 16BIT DIFF 10-MSOP
LTC2433-1CMS-ND - IC ADC DIFF 16BIT 3WIRE 10-MSOP
LTC2433-1
11
24331fa
Simultaneous Frequency Rejection
The LTC2433-1 internal oscillator provides better than
87dB normal mode rejection over the range of 49Hz to
61.2Hz as shown in Figure 4. For this simultaneous 50Hz/
60Hz rejection, FO should be connected to GND.
When a fundamental rejection frequency different from
the range 49Hz to 61.2Hz is required or when the converter
must be sychronized with an outside source, the LTC2433-1
can operate with an external conversion clock. The conveter
automatically detects the presence of an external clock
signal at the FO pin and turns off the internal oscillator. The
frequency fEOSC of the external signal must be at least
Table 2. LTC2433-1 Output Data Format
Differential Input Voltage
Bit 18
Bit 17
Bit 16
Bit 15
Bit 14
Bit 13
Bit 12
…
Bit 0
VIN*
EOC
DMY
SIG
MSB
VIN* ≥ 0.5 VREF**
0
0110
0
…
0
0.5 VREF** – 1LSB
0
0101
1
…
1
0.25 VREF**
0
0101
0
…
0
0.25 VREF** – 1LSB
0
0100
1
…
1
0
0100
0
…
0
–1LSB
0
0011
1
…
1
– 0.25 VREF**
0
0011
0
…
0
– 0.25 VREF** – 1LSB
0
0010
1
…
1
– 0.5 VREF**
0
0010
0
…
0
VIN* < –0.5 VREF**
0
0001
1
…
1
*The differential input voltage VIN = IN+ – IN–.
**The differential reference voltage VREF = REF+ – REF–.
Figure 4. LTC2433-1 Normal Mode
Rejection When Using an Internal Oscillator
48
50
52
54
56
58
60
62
DIFFERENTIAL INPUT SIGNAL FREQUENCY (Hz)
NORMAL
MODE
REECTION
RATIO
(dB)
24361 F04
–80
–90
–100
–120
–130
–140
2560Hz to be detected. The external clock signal duty cycle
is not significant as long as the minimum and maximum
specifications for the high and low periods, tHEO and tLEO,
are observed.
While operating with an external conversion clock of a
frequency fEOSC,theLTC2433-1providesbetterthan110dB
normal mode rejection in a frequency range fEOSC/2560
±4%. The normal mode rejection as a function of the input
frequency deviation from fEOSC/2560 is shown in Figure 5.
Whenever an external clock is not present at the FO pin the
converter automatically activates its internal oscillator and
enters the Internal Conversion Clock mode. The LTC2433-1
Figure 5. LTC2433-1 Normal Mode Rejection When
Using an External Oscillator of Frequency fEOSC
DIFFERENTIAL INPUT SIGNAL FREQUENCY
DEVIATION FROM NOTCH FREQUENCY fEOSC/2560(%)
–12
–8
–4
048
12
NORMAL
MODE
REJECTION
(dB)
24361 F05
–80
–85
–90
–95
–100
–105
–110
–115
–120
–125
–130
–135
–140
APPLICATIO S I FOR ATIO
WU
UU
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