參數(shù)資料
型號(hào)： LTC2410IGN#TR
廠商： Linear Technology
文件頁(yè)數(shù)： 26/48頁(yè)
文件大小： 0K
描述： IC ADC 24BIT DIFF INP/REF 16SSOP
標(biāo)準(zhǔn)包裝： 2,500
位數(shù)： 24
采樣率（每秒）： 7.5
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： 16-SSOP（0.154"，3.90mm 寬）
供應(yīng)商設(shè)備封裝： 16-SSOP
包裝： 帶卷 (TR)
輸入數(shù)目和類型： 1 個(gè)差分，雙極
配用： DC575A-ND - BOARD DELTA SIGMA ADC LTC2410
LTC2410
32
APPLICATIO S I FOR ATIO
WU
U
When external amplifiers are driving the LTC2410, the
ADC input referred system noise calculation can be simpli-
fied by Figure 36. The noise of an amplifier driving the
LTC2410 input pin can be modeled as a band limited white
noise source. Its bandwidth 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 36, using fi as the x-axis selector, we can find
on the y-axis the noise equivalent bandwidth freqi of the
input driving amplifier. This bandwidth includes the band
limiting effects of the ADC internal calibration and filtering.
The noise of the driving amplifier referred to the converter
input and including all these effects can be calculated as
N = ni √freqi. The total system noise (referred to the
LTC2410 input) can now be obtained by summing as
square root of sum of squares the three ADC input referred
noise sources: the LTC2410 internal noise (800nV), the
noise of the IN+ driving amplifier and the noise of the IN–
driving amplifier.
If the FO pin is driven by an external oscillator of frequency
fEOSC, Figure 36 can still be used for noise calculation if the
x-axis is scaled by fEOSC/153600. For large values of the
ratio fEOSC/153600, the Figure 36 plot accuracy begins to
decrease, but in the same time the LTC2410 noise floor
rises and the noise contribution of the driving amplifiers
lose significance.
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 LTC2410 significantly
simplifies antialiasing filter requirements.
The Sinc4 digital filter provides greater than 120dB normal
mode rejection at all frequencies except DC and integer
multiples of the modulator sampling frequency (fS). The
LTC2410’s autocalibration circuits further simplify the
antialiasing requirements by additional normal mode sig-
nal filtering both in the analog and digital domain. Inde-
pendent of the operating mode, fS = 256 fN = 2048
fOUTMAX where fN in the notch frequency and fOUTMAX is
the maximum output data rate. In the internal oscillator
mode with a 50Hz notch setting, fS = 12800Hz and with a
60Hz notch setting fS = 15360Hz. In the external oscillator
mode, fS = fEOSC/10.
Figure 37. Input Normal Mode Rejection,
Internal Oscillator and 50Hz Notch
Figure 38. Input Normal Mode Rejection, Internal
Oscillator and 60Hz Notch or External Oscillator
DIFFERENTIAL INPUT SIGNAL FREQUENCY (Hz)
0fS 2fS 3fS 4fS 5fS 6fS 7fS 8fS 9fS10fS11fS12fS
INPUT
NORMAL
MODE
REJECTION
(dB)
2410 F37
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
FO = HIGH
FO = LOW OR
FO = EXTERNAL OSCILLATOR,
fEOSC = 10 fS
DIFFERENTIAL INPUT SIGNAL FREQUENCY (Hz)
0fS
INPUT
NORMAL
MODE
REJECTION
(dB)
2410 F38
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
2fS 3fS 4fS 5fS 6fS 7fS 8fS 9fS 10fS
Figure 36. Input Referred Noise Equivalent Bandwidth
of an Input Connected White Noise Source
INPUT NOISE SOURCE SINGLE POLE
EQUIVALENT BANDWIDTH (Hz)
1
INPUT
REFERRED
NOISE
EQUIVALENT
BANDWIDTH
(Hz)
10
0.1
1
10
100
1k
10k
100k
1M
2410 F36
0.1
100
FO = HIGH
FO = LOW
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LTC2411-1CMSPBF 制造商:Linear Technology 功能描述:ADC 24-Bit Differential and Ref. MSOP10
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