參數(shù)資料
型號(hào)： DC586A
廠商： Linear Technology
文件頁數(shù)： 22/40頁
文件大小： 0K
描述： BOARD DELTA SIGMA ADC LTC2431
軟件下載： QuikEval System
設(shè)計(jì)資源： DC586A Design File
DC586A Schematic
標(biāo)準(zhǔn)包裝： 1
系列： QuikEval™
ADC 的數(shù)量： 2
位數(shù)： 20
采樣率（每秒）： 7.5
數(shù)據(jù)接口： MICROWIRE?，串行，SPI?
工作溫度： 0°C ~ 70°C
已用 IC / 零件： LTC2431
已供物品： 板
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LTC2431IMS#PBF-ND - IC ADC 20BIT DIFFINPUT/REF10MSOP
LTC2431CMS#TRPBF-ND - IC ADC 20BIT DIFFINPUT/REF10MSOP
LTC2431IMS#TRPBF-ND - IC ADC 20BIT DIFFINPUT/REF10MSOP
LTC2431CMS#PBF-ND - IC ADC 20BIT DIFFINPUT/REF10MSOP
LTC2431CMS-ND - IC ADC 20BIT DIFFINPUT/REF10MSOP
LTC2431IMSTR-ND - IC ADC 20BIT DIFFINPUT/REF10MSOP
LTC2431IMS-ND - IC ADC 20BIT DIFFINPUT/REF10MSOP
LTC2431CMSTR-ND - IC ADC 20BIT DIFFINPUT/REF10MSOP
LTC2430/LTC2431
29
24301f
an infinite bandwidth source and 216nV/
√Hz for a single
0.5MHz pole source. From these numbers, it is clear that
particular attention must be given to the design of external
amplification circuits. Such circuits face the
simultaneous requirements of very low bandwidth (just a
few Hz) in order to reduce the output referred noise and
relatively high bandwidth (at least 500kHz) necessary to
drive the input switched-capacitor network. A possible
solution is a high gain, low bandwidth amplifier stage
followed by a high bandwidth unity-gain buffer.
When external amplifiers are driving the LTC2430/
LTC2431, the ADC input referred system noise calculation
can be simplified by Figure 29. The noise of an amplifier
driving the LTC2430/LTC2431 input pin can be modeled
as a band-limited white noise source. Its bandwidth can be
approximated by the bandwidth of a single pole lowpass
filter with a corner frequency fi. The amplifier noise spec-
tral density is ni. From Figure 29, using fi as the x-axis
selector, we can find on the y-axis the noise equivalent
bandwidth freqi of the input driving amplifier. This band-
width includes the band limiting effects of the ADC internal
calibration and filtering. The noise of the driving amplifier
referred to the converter input and including all these
effects can be calculated as N = ni √freqi. The total system
noise (referred to the LTC2430/LTC2431 input) can now
be obtained by summing as square root of sum of squares
the three ADC input referred noise sources: the LTC2430/
LTC2431 internal noise (2.8
V), the noise of the IN+
driving amplifier and the noise of the IN– driving amplifier.
APPLICATIO S I FOR ATIO
WU
UU
Figure 28. Input Signal Bandwidth Using the Internal Oscillator
Figure 26. Resolution (NoiseRMS ≤ 1LSB)
vs Output Data Rate and VCC
OUTPUT DATA RATE (READINGS/SEC)
0
15
RESOLUTION
(BITS)
16
18
19
20
22
10
50
70
2430 F26
17
21
40
90 100
20 30
60
80
VINCM = VREFCM
VIN = 0V
FO = EXT OSC
REF– = GND
TA = 25°C
RES = LOG2(VREF/NOISERMS)
VCC = VREF = 5V
VCC = 2.7V
VREF = 2.5V
Figure 27. Resolution (INLMAX ≤ 1LSB)
vs Output Data Rate and VCC
OUTPUT DATA RATE (READINGS/SEC)
0
15
RESOLUTION
(BITS)
16
18
19
20
22
10
50
70
2430 F27
17
21
40
90 100
20 30
60
80
VINCM = VREFCM
VIN = 0V
FO = EXT OSC
REF– = GND
TA = 25°C
RES = LOG2(VREF/INLMAX)
VCC = VREF = 5V
VCC = 2.7V
VREF = 2.5V
DIFFERENTIAL INPUT SIGNAL FREQUENCY (Hz)
0
INPUT
SIGNAL
ATTENUATION
(dB)
–3
–2
–1
0
4
2431 F28
–4
–5
–6
1
2
3
5
FO = HIGH
FO = LOW
INPUT NOISE SOURCE SINGLE POLE
EQUIVALENT BANDWIDTH (Hz)
1
INPUT
REFERRED
NOISE
EQUIVALENT
BANDWIDTH
(Hz)
10
100
1000
10
100
1k
10k 100k
1M
2431 G29
0.1
1
FO = LOW
FO = HIGH
Figure 29. Input Referred Noise Equivalent Bandwidth
of an Input Connected White Noise Source
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