參數(shù)資料
型號： DC846A
廠商： Linear Technology
文件頁數(shù)： 14/28頁
文件大小： 0K
描述： BOARD DELTA SIGMA ADC LTC2447
軟件下載： QuikEval System
設計資源： DC846A Design File
DC846A Schematic
標準包裝： 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： LTC2447
已供物品： 板
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LTC2446/LTC2447
21
24467fa
Figure 11. LTC2446/LTC2447
Normal Mode Rejection (Internal Oscillator)
Figure 10. LTC2446/LTC2447
Normal Mode Rejection (Internal Oscillator)
APPLICATIO S I FOR ATIO
WU
U
Table 6. 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 LTC2446/LTC2447 signifi-
cantly simplify antialiasing filter requirements.
The LTC2446/LTC2447’s speed/resolution 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 1x 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
6. The rejection at the frequency fN ±14% is better than
80dB, see Figure 11.
DIFFERENTIAL INPUT SIGNAL FREQUENCY (Hz)
0
–60
–40
0
180
24467 F10
–80
–100
60
120
240
–120
–140
–20
NORMAL
MODE
REJECTION
(dB)
SINC4 ENVELOPE
DIFFERENTIAL INPUT SIGNAL FREQUENCY (Hz)
47
–140
NORMAL
MODE
REJECTION
(dB)
–130
–120
–110
–100
51
55
59
63
24467 F11
–90
–80
49
53
57
61
If FO is grounded, fS is set by the on-chip oscillator at
1.8MHz
±5% (over supply and temperature variations). At
an OSR of 32,768, the first NULL is at fN = 55Hz and the no
latency output rate is fN/8 = 6.9Hz. At the maximum OSR,
the noise performance of the device is 280nVRMS
(LTC2446) and 200nVRMS (LTC2447) with better than
80dB rejection of 50Hz
±2%and60Hz±2%.SincetheOSR
is large (32,768) the wide band rejection is extremely large
and the antialiasing requirements are simple. The first
multiple of fS occurs at 55Hz 32,768 = 1.8MHz, see
Figure 12.
The first NULL becomes fN = 7.04kHz with an OSR of 256
(an output rate of 880Hz) and FO grounded. While the
NULL has shifted, the sample rate remains constant. As a
result of constant modulator sampling rate, the linearity,
Figure 12. LTC2446/LTC2447
Normal Mode Rejection (Internal Oscillator)
DIFFERENTIAL INPUT SIGNAL FREQUENCY (Hz)
0
–60
–40
0
24467 F12
–80
–100
1000000
2000000
–120
1.8MHz
–140
–20
NORMAL
MODE
REJECTION
(dB)
REJECTION > 120dB
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