參數(shù)資料
型號: LTC2444CUHF
廠商: LINEAR TECHNOLOGY CORP
元件分類: ADC
英文描述: 24-Bit High Speed 8-/16-Channel ADCs with Selectable Speed/Resolution
中文描述: 8-CH 24-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PQCC38
封裝: 7 X 5 MM, PLASTIC, MO-220-WHKD, QFN-38
文件頁數(shù): 25/28頁
文件大?。?/td> 270K
代理商: LTC2444CUHF
LTC2444/LTC2445/
LTC2448/LTC2449
25
sn2444589 2444589fs
First Notch Frequency
This is the first notch in the SINC
4
portion of the digital
filter and depends on the f
o
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-
sample
Ratio LTC2444/ LTC2445/ LTC2444/ LTC2445/
(OSR) LTC2448 LTC2449 LTC2449 LTC2449
64
23
μ
V
23
μ
V
128
4.5
μ
V
3.5
μ
V
256
2.8
μ
V
2
μ
V
512
2
μ
V
1.4
μ
V
1024
1.4
μ
V
1
μ
V
2048
1.1
μ
V
750nV
4096
720nV
510nV
8192
530nV
375nV
16384
350nV
250nV
32768
280nV
200nV
*RMS
Noise
*RMS
Noise
ENOB
(V
REF
= 5V)
Maximum
Conversion Rate
Internal
9MHz clock
3515.6
1757.8
878.9
439.5
219.7
109.9
54.9
27.5
13.7
6.9
First Notch
Frequency
Internal
9MHz clock
28125
14062.5
7031.3
3515.6
1757.8
878.9
439.5
219.7
109.9
54.9
Effective
Noise BW
Internal
9MHz clock
3148
1574
787
394
197
98.4
49.2
24.6
12.4
6.2
–3dB
point (Hz)
Internal
9MHz clock
1696
848
424
212
106
53
26.5
13.2
6.6
3.3
External
f
o
f
o
/2560
f
o
/5120
f
o
/10240
f
o
/20480
f
o
/40960
f
o
/81920
f
o
/163840
f
o
/327680
f
o
/655360
f
o
/1310720
External
f
o
f
o
/320
f
o
/640
f
o
/1280
f
o
/2560
f
o
/5120
f
o
/1020
f
o
/2050
f
o
/4100
f
o
/8190
f
o
/16380
External
f
o
f
o
/5710
f
o
/2860
f
o
/1140
f
o
/2280
f
o
/4570
f
o
/9140
f
o
/18300
f
o
/36600
f
o
/73100
f
o
/146300
External
f
o
f
o
/5310
f
o
/10600
f
o
/21200
f
o
/42500
f
o
/84900
f
o
/170000
f
o
/340000
f
o
/679000
f
o
/1358000
f
o
/2717000
17
20.1
20.8
21.3
21.8
22.1
22.7
23.2
23.8
24.1
17
20
21.3
21.8
22.4
22.9
23.4
24
24.4
24.6
Input Bandwidth and Frequency Rejection
The combined effect of the internal SINC
4
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 f
o
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.
APPLICATIU
W
U
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.
相關(guān)PDF資料
PDF描述
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LTC2444IUHF 24-Bit High Speed 8-/16-Channel ADCs with Selectable Speed/Resolution
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LTC2445CUHF 24-Bit High Speed 8-/16-Channel ADCs with Selectable Speed/Resolution
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