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參數(shù)資料
| 型號： | LTC2411-1IMS#TRPBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 22/40頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC A/DCONV DIFF INPUT&REF 10MSOP |
| 標準包裝： | 2,500 |
| 位數(shù)： | 24 |
| 采樣率（每秒）： | 6.8 |
| 數(shù)據(jù)接口： | MICROWIRE?，串行，SPI? |
| 轉(zhuǎn)換器數(shù)目： | 2 |
| 功率耗散（最大）： | 1mW |
| 電壓電源： | 單電源 |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 10-TFSOP，10-MSOP（0.118"，3.00mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 10-MSOP |
| 包裝： | 帶卷 (TR) |
| 輸入數(shù)目和類型： | 1 個差分，雙極 |
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LTC2411/LTC2411-1
29
the internal oscillator is used, the 3dB input bandwidth of
the LTC2411 is 3.63Hz for 60Hz notch frequency (FO =
LOW) and 3.02Hz for 50Hz notch frequency (FO = HIGH).
The 3dB input bandwidth for the LTC2411-1 is 3.30Hz
(FO = LOW). If an external conversion clock generator of
frequency fEOSC is connected to the FO pin, the 3dB input
bandwidth is 0.236 10–6 fEOSC.
Due to the complex filtering and calibration algorithms
utilized, the converter input bandwidth is not modeled very
accurately by a first order filter with the pole located at the
3dB frequency. When the internal oscillator is used, the
shape of the LTC2411/LTC2411-1 input bandwidth is
shown in Figure 28. When an external oscillator of fre-
quency fEOSC isused,theshapeoftheLTC2411/LTC2411-1
input bandwidth can be derived from Figure 28, FO = LOW
curve of the LTC2411 in which the horizontal axis is scaled
by fEOSC/153600.
The conversion noise (1.45
VRMS typical for VREF = 5V)
can be modeled as a white noise source connected to a
noise free converter. The noise spectral density is 70nV/
√Hz
for an infinite bandwidth source and 126nV/
√Hz for a
single 0.5MHz pole source. From these numbers, it is clear
that particular attention must be given to the design of
external amplification circuits. Such circuits face the
simultaneous requirements of very low bandwidth (just a
few Hz) in order to reduce the output referred noise and
relatively high bandwidth (at least 500kHz) necessary to
drive the input switched-capacitor network. A possible
APPLICATIO S I FOR ATIO
WU
UU
Figure 27. Resolution (INLMAX ≤ 1LSB)
vs Output Data Rate and Reference Voltage
OUTPUT DATA RATE (READINGS/SEC)
10
RESOLUTION
(BITS)
14
18
22
12
16
20
40
60
80
2411 F27
100
10
030
50
70
90
VCC = 5V
REF– = GND
VINCM = 2.5V
VIN = 0V
FO = EXT OSC
RES = LOG2(VREF/INLMAX)
TA = 25°C
VREF = 5V
VREF = 2.5V
Figure 26. Resolution (NoiseRMS ≤ 1LSB)
vs Output Data Rate and Reference Voltage
OUTPUT DATA RATE (READINGS/SEC)
0
RESOLUTION
(BITS)
20
21
80
2411 F26
19
18
20
40 50
100
22
60
10
30
90
70
VCC = 5V
REF– = GND
VINCM = 2.5V
VIN = 0V
FO = EXT OSC
RES = LOG2(VREF/NOISERMS)
TA = 25°C
VREF = 2.5V
VREF = 5V
Figure 28. Input Signal Bandwidth
Using the Internal Oscillator
DIFFERENTIAL INPUT SIGNAL FREQUENCY (Hz)
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
INPUT
SIGNAL
ATTENUATION
(dB)
2411 F28
0.0
–0.5
–1.0
–1.5
–2.0
–2.5
–3.0
–3.5
–4.0
–4.5
–5.0
–5.5
–6.0
FO = HIGH
(LTC2411)
FO = LOW
(LTC2411)
FO = LOW
(LTC2411-1)
solution is a high gain, low bandwidth amplifier stage
followed by a high bandwidth unity-gain buffer.
When external amplifiers are driving the LTC2411/
LTC2411-1, the ADC input referred system noise calcula-
tion can be simplified by Figure 29. The noise of an
amplifier driving the LTC2411/LTC2411-1 input pin can be
modeled as a band-limited white noise source. Its band-
width can be approximated by the bandwidth of a single
pole lowpass filter with a corner frequency fi. The amplifier
noise spectral density is ni. From Figure 29, using fi as the
x-axis selector, we can find on the y-axis the noise equiva-
lent bandwidth freqi of the input driving amplifier. This
bandwidth includes the band limiting effects of the ADC
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