INPUT SIGNAL FREQUENCY (fN) INPUT NOR" />
參數(shù)資料
型號(hào)： DC939A
廠商： Linear Technology
文件頁數(shù)： 31/42頁
文件大?。?/td> 0K
描述： BOARD DELTA SIGMA ADC LTC2484
軟件下載： QuikEval System
設(shè)計(jì)資源： DC939A Design File
DC939A Schematic
標(biāo)準(zhǔn)包裝： 1
系列： Easy Drive™, QuikEval™
ADC 的數(shù)量： 1
位數(shù)： 24
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： LTC2484
已供物品： 板
相關(guān)產(chǎn)品： LTC2484CDD#TRPBF-ND - IC ADC 24BIT 10-DFN
LTC2484IDD#TRPBF-ND - IC ADC 24BIT 10-DFN
LTC2484IDD#PBF-ND - IC ADC 24BIT 10-DFN
LTC2484CDD#PBF-ND - IC ADC 24BIT 10-DFN
LTC2484
37
2484fd
APPLICATIONS INFORMATION
INPUT SIGNAL FREQUENCY (fN)
INPUT
NORMAL
REJECTION
(dB)
2484 F39
0
–20
–40
–60
–80
–100
–120
0
fN
2fN 3fN 4fN 5fN 6fN 7fN 8fN
INPUT SIGNAL FREQUENCY (fN)
INPUT
NORMAL
REJECTION
(dB)
2484 F40
0
–20
–40
–60
–80
–100
–120
250
248
252 254 256 258 260 262 264
Figure 39. Input Normal Mode Rejection 2x Speed Mode
Figure 40. Input Normal Mode Rejection 2x Speed Mode
INPUT FREQUENCY (Hz)
0
NORMAL
MODE
REJECTION
(dB)
50
100 125
225
25
75
150 175 200
0
–20
–40
–60
–80
–100
–120
VCC = 5V
VREF = 5V
VINCM = 2.5V
VIN(P-P) = 5V
fO = GND
TA = 25°C
MEASURED DATA
CALCULATED DATA
Figure 41. Input Normal Mode Rejection vs Input Frequency,
2x Speed Mode and 50Hz/60Hz Mode
DIFFERENTIAL INPUT SIGNAL FREQUENCY (Hz)
48
–70
–80
–90
–100
–110
–120
–130
–140
54
58
50
52
56
60
62
NORMAL
MODE
REJECTION
(dB)
NO AVERAGE
WITH
RUNNING
AVERAGE
Figure 42. Input Normal Mode Rejection 2x Speed Mode
Using the 2x speed mode of the LTC2484, the device
bypasses the digital offset calibration operation to double
the output data rate. The superior normal mode rejection
is maintained as shown in Figures 30 and 31. However,
the magnied details near DC and fS = 256fN are different,
see Figures 39 and 40. In 2x speed mode, the bandwidth
is 11.4Hz for the 50Hz rejection mode, 13.6Hz for the 60Hz
rejection mode and 12.4Hz for the 50Hz/60Hz rejection
mode. Typical measured values of the normal mode rejec-
tion of the LTC2484 operating with the internal oscillator
and 2x speed mode is shown in Figure 41.
When the LTC2484 is congured in 2x speed mode, by
performing a running average, a SINC1 notch is combined
with the SINC4 digital lter, yielding the normal mode
rejection identical as that for the 1x speed mode. The
averaging operation still keeps the output rate with the
following algorithm:
Result 1 = average (sample 0, sample 1)
Result 2 = average (sample 1, sample 2)
……
Result n = average (sample n – 1, sample n)
The main advantage of the running average is that it
achieves simultaneous 50Hz/60Hz rejection at twice the
effective output rate, as shown in Figure 42. The raw
output data provides a better than 70dB rejection over
48Hz to 62.4Hz, which covers both 50Hz ±2% and 60Hz
±2%. With running average on, the rejection is better than
87dB for both 50Hz ±2% and 60Hz ±2%.
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