This is the first notch in the SINC4
參數(shù)資料
型號： DC742A
廠商： Linear Technology
文件頁數(shù)： 18/28頁
文件大?。?/td> 0K
描述： BOARD DELTA SIGMA ADC LTC2449
軟件下載： QuikEval System
設(shè)計資源： DC742A Design File
DC742A Schematic
標(biāo)準(zhǔn)包裝： 1
系列： QuikEval™
ADC 的數(shù)量： 1
位數(shù)： 24
采樣率（每秒）： 8k
數(shù)據(jù)接口： MICROWIRE?，串行，SPI?
已用 IC / 零件： LTC2449
已供物品： 板
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LTC2444/LTC2445/
LTC2448/LTC2449
25
2444589fb
First Notch Frequency
This is the first notch in the SINC4 portion of the digital
filter 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 LTC2444/LTC2445/LTC2448/LTC2449 has extremely
good input noise rejection from the first 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 modu-
lator sample rate. The example on the following page
shows how the noise rejection of the LTC2444/LTC2445/
LTC2448/LTC2449 reduces the effective noise of an am-
plifier driving its input.
Table 8
Over-
*RMS
ENOB
Maximum
First Notch
Effective
–3dB
sample
Noise
(VREF = 5V)
Conversion Rate
Frequency
Noise BW
point (Hz)
Ratio LTC2444/ LTC2445/ LTC2444/ LTC2445/
Internal
External
Internal
External
Internal
External
Internal
External
(OSR) LTC2448 LTC2449 LTC2449 LTC2449
9MHz clock
fo
9MHz clock
fo
9MHz clock
fo
9MHz clock
fo
64
23
V23V
17
3515.6
fo/2560
28125
fo/320
3148
fo/5710
1696
fo/5310
128
4.5
V
3.5
V
20.1
20
1757.8
fo/5120
14062.5
fo/640
1574
fo/2860
848
fo/10600
256
2.8
V2V
20.8
21.3
878.9
fo/10240
7031.3
fo/1280
787
fo/1140
424
fo/21200
512
2
V
1.4
V
21.3
21.8
439.5
fo/20480
3515.6
fo/2560
394
fo/2280
212
fo/42500
1024
1.4
V1V
21.8
22.4
219.7
fo/40960
1757.8
fo/5120
197
fo/4570
106
fo/84900
2048
1.1
V
750nV
22.1
22.9
109.9
fo/81920
878.9
fo/1020
98.4
fo/9140
53
fo/170000
4096
720nV
510nV
22.7
23.4
54.9
fo/163840
439.5
fo/2050
49.2
fo/18300
26.5
fo/340000
8192
530nV
375nV
23.2
24
27.5
fo/327680
219.7
fo/4100
24.6
fo/36600
13.2
fo/679000
16384
350nV
250nV
23.8
24.4
13.7
fo/655360
109.9
fo/8190
12.4
fo/73100
6.6
fo/1358000
32768
280nV
200nV
24.1
24.6
6.9
fo/1310720
54.9
fo/16380
6.2
fo/146300
3.3
fo/2717000
Input Bandwidth and Frequency Rejection
The combined effect of the internal SINC4 digital filter and
the digital and analog autocalibration circuits determines
the LTC2444/LTC2445/LTC2448/LTC2449 input band-
width and rejection characteristics. The digital filter’s
response can be adjusted by setting the oversample ratio
(OSR) through the SPI interface or by supplying an exter-
nal conversion clock to the fo pin.
Table 8 lists the properties of the LTC2444/LTC2445/
LTC2448/LTC2449 with various combinations of
oversample ratio and clock frequency. Understanding
these properties is the key to fine tuning the characteris-
tics of the LTC2444/LTC2445/LTC2448/LTC2449 to the
application.
Maximum Conversion Rate
The maximum conversion rate is the fastest possible rate
at which conversions can be performed.
APPLICATIO S I FOR ATIO
WU
U
*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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