參數(shù)資料
型號(hào): DC845A
廠商: Linear Technology
文件頁(yè)數(shù): 15/28頁(yè)
文件大?。?/td> 0K
描述: BOARD DELTA SIGMA ADC LTC2448
軟件下載: QuikEval System
設(shè)計(jì)資源: DC845A Design File
DC845A 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: LTC2448
已供物品:
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LTC2444/LTC2445/
LTC2448/LTC2449
22
2444589fb
DIFFERENTIAL INPUT SIGNAL FREQUENCY (Hz)
47
–140
NORMAL
MODE
REJECTION
(dB)
–130
–120
–110
–100
51
55
59
63
2440 F12
–90
–80
49
53
57
61
Figure 11. LTC2444/LTC2445/LTC2448/LTC2449
Normal Mode Rejection (Internal Oscillator)
DIFFERENTIAL INPUT SIGNAL FREQUENCY (Hz)
0
–60
–40
0
180
2440 F11
–80
–100
60
120
240
–120
–140
–20
NORMAL
MODE
REJECTION
(dB)
SINC4 ENVELOPE
Figure 10. LTC2444/LTC2445/LTC2448/LTC2449
Normal Mode Rejection (Internal Oscillator)
APPLICATIO S I FOR ATIO
WU
U
Table 7. OSR vs Notch Frequency (fN) (with Internal Oscillator
Running at 9MHz)
OSR
NOTCH (fN)
64
28.16kHz
128
14.08kHz
256
7.04kHz
512
3.52kHz
1024
1.76kHz
2048
880Hz
4096
440Hz
8192
220Hz
16384
110Hz
32768*
55Hz
*Simultaneous 50/60Hz rejection
Normal Mode Rejection and Antialiasing
One of the advantages delta-sigma ADCs offer over con-
ventional ADCs is on-chip digital filtering. Combined with
a large oversampling ratio, the LTC2444/LTC2445/
LTC2448/LTC2449 significantly simplify antialiasing filter
requirements.
The LTC2444/LTC2445/LTC2448/LTC2449’s speed/reso-
lution is determined by the over sample ratio (OSR) of the
on-chip digital filter. The OSR ranges from 64 for 3.5kHz
output rate to 32,768 for 6.9Hz (in No Latency mode)
output rate. The value of OSR and the sample rate fS
determine the filter characteristics of the device. The first
NULL of the digital filter is at fN and multiples of fN where
fN = fS/OSR, see Figure 10 and Table 7. The rejection at the
frequency fN ±14% is better than 80dB, see Figure 11.
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