參數(shù)資料
型號： DC570A
廠商： Linear Technology
文件頁數(shù)： 18/28頁
文件大?。?/td> 0K
描述： BOARD DELTA SIGMA ADC LTC2440
軟件下載： QuikEval System
設(shè)計資源： DC570A Design File
DC570A Schematic
標準包裝： 1
系列： QuikEval™
ADC 的數(shù)量： 2
位數(shù)： 24
采樣率（每秒）： 3.5k
數(shù)據(jù)接口： MICROWIRE?，串行，SPI?
工作溫度： 0°C ~ 70°C
已用 IC / 零件： LTC2440
已供物品： 板
相關(guān)產(chǎn)品： LTC2440CGN#TRPBF-ND - IC ADC DIFFER 24-BIT HS 16-SSOP
LTC2440IGN#TRPBF-ND - IC ADC DIFFER 24-BIT HS 16-SSOP
LTC2440IGN#PBF-ND - IC ADC DIFFER 24-BIT HS 16-SSOP
LTC2440CGN#PBF-ND - IC ADC DIFFER 24-BIT HS 16-SSOP
LTC2440IGN#TR-ND - IC CONV A/D 24-BIT DIFF 16-SSOP
LTC2440CGN#TR-ND - IC CONV A/D 24-BIT DIFF 16-SSOP
LTC2440IGN-ND - IC ADC DIFFER 24-BIT HS 16-SSOP
LTC2440CGN-ND - IC ADC DIFFER 24-BIT HS 16-SSOP
LTC2440
25
2440fd
APPLICATIONS INFORMATION
Table 6 lists the properties of the LTC2440 with various
combinations of oversample ratio and clock frequency.
Understanding these properties is the key to ne tuning
the characteristics of the LTC2440 to the application.
Maximum Conversion Rate
The maximum conversion rate is the fastest possible rate
at which conversions can be performed.
First Notch Frequency
This is the rst notch in the SINC4 portion of the digital lter
and depends on the fo clock frequency and the oversample
ratio. Rejection at this frequency and its multiples (up to
the modulator sample rate of 1.8MHz) exceeds 120dB.
This is 8 times the maximum conversion rate.
Effective Noise Bandwidth
The LTC2440 has extremely good input noise rejection from
the rst notch frequency all the way out to the modulator
sample rate (typically 1.8MHz). Effective noise bandwidth
is a measure of how the ADC will reject wideband input
noise up to the modulator sample rate. The example on
the following page shows how the noise rejection of the
LTC2440 reduces the effective noise of an amplier driv-
ing its input.
Table 6
Oversample
Ratio
(OSR)
ADC
Noise*
ENOB
(VREF = 5V)*
Maximum Conversion Rate
First Notch Frequency
Effective Noise BW
–3dB Point (Hz)
Internal
9MHz clock
External
fO
Internal
9MHz cloc
k
External
fO
Internal
9MHz clock
External
fO
Internal
9MHz clock
External
fO
64
23μV
17
3515.6
fO/2560
28125
fO/320
3148
fO/2850
1696
fO/5310
128
3.5μV
20
1757.8
fO/5120
14062.5
fO/640
1574
fO/5700
848
fO/10600
256
2μV
21.3
878.9
fO/10240
7031.3
fO/1280
787
fO/11400
424
fO/21200
512
1.4μV
21.8
439.5
fO/20480
3515.6
fO/2560
394
fO/22800
212
fO/42500
1024
1μV
22.4
219.7
fO/40960
1757.8
fO/5120
197
fO/45700
106
fO/84900
2048
750nV
22.9
109.9
fO/81920
878.9
fO/1020
98.4
fO/91400
53
fO/170000
4096
510nV
23.4
54.9
fO/163840
439.5
fO/2050
49.2
fO/183000
26.5
fO/340000
8192
375nV
24
27.5
fO/327680
219.7
fO/4100
24.6
fO/366000
13.2
fO/679000
16384
250nV
24.4
13.7
fO/655360
109.9
fO/8190
12.4
fO/731000
6.6
fO/1358000
32768
200nV
24.6
6.9
fO/1310720
54.9
fO/16380
6.2
fO/1463000
3.3
fO/2717000
*ADC noise increases by approximately √2 when OSR is decreased by a factor of 2 for OSR 32768 to OSR 256. The ADC noise at OSR 128 and OSR 64
include effects from internal modulator quantization noise.
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