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參數資料
| 型號： | LTC2435-1IGN#TR |
| 廠商： | Linear Technology |
| 文件頁數： | 29/42頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC CONV A/D 20BIT DIFF 16-SSOP |
| 標準包裝： | 2,500 |
| 位數： | 20 |
| 采樣率（每秒）： | 13.75 |
| 數據接口： | MICROWIRE?，串行，SPI? |
| 轉換器數目： | 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） |
| 供應商設備封裝： | 16-SSOP |
| 包裝： | 帶卷 (TR) |
| 輸入數目和類型： | 1 個差分，雙極 |
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LTC2435/LTC2435-1
35
24351fc
For more information www.linear.com/LTC2435
applicaTions inForMaTion
Through FO connection, the LTC2435 provides better than
110dB input differential mode rejection at 50Hz or 60Hz
±2%. While for the LTC2435-1, it has a notch frequency
of about 55Hz with better than 70db rejection over 48Hz
to 62.4Hz, which covers both 50Hz ±2% and 60Hz ±2%.
In order to achieve better rejection over the range of
48Hz to 62.4Hz, a running average can be performed. By
averaging two consecutive LTC2435-1 readings, a SINC1
notch is combined with the SINC4 digital filter, yielding
the frequency response shown in Figure 37. The averag-
ing operation still keeps the output rate with the following
algorithm:
Result 1 = average (sample 0, sample 1)
Result 2 = average (sample 1, sample 2)
Result n = average (sample n-1, sample n)
The user can expect to achieve in practice this level of
performance using the internal oscillator as it is demon-
strated by Figures 38 to 40. Typical measured values of
the normal mode rejection of the LTC2435-1 operating
with an internal oscillator and a 54.6Hz notch setting
are shown in Figure 38 and 39 superimposed over the
theoretical calculated curve. The same normal mode
rejection performance is obtained for the LTC2435 with
the frequency scaled to have the notch frequency at 60Hz
(FO = GND) or 50Hz (FO = VCC).
As a result of these remarkable normal mode specifica-
tions,minimal(ifany)anti-aliasfilteringisrequiredinfront
of the LTC2435/LTC2435-1. If passive RC components
are placed in front of the LTC2435/LTC2435-1, the input
dynamic current should be considered (see Input Current
section). In cases where large effective RC time constants
are used, an external buffer amplifier may be required to
minimize the effects of dynamic input current.
Traditional high order delta-sigma modulators, while
providing very good linearity and resolution, suffer from
potential instabilities at large input signal levels. The
proprietaryarchitectureusedfortheLTC2435/LTC2435-1
third order modulator resolves this problem and guaran-
tees a predictable stable behavior at input signal levels of
Figure 37. LTC2435-1 Input Normal Mode Rejection
DIFFERENTIAL INPUT SIGNAL FREQUENCY (Hz)
48
–70
–80
–90
–100
–110
–120
–130
–140
54
58
2435 F37
50
52
56
60
62
NORMAL
MODE
REJECTION
(dB)
NO AVERAGE
WITH
RUNNING
AVERAGE
Figure 38. Input Normal Mode Rejection
vs Input Frequency (LTC2435-1)
INPUT FREQUENCY (Hz)
0
NORMAL
MODE
REJECTION
(dB)
50
100 125
225
2435 F38
25
75
150 175 200
0
–20
–40
–60
–80
–100
–120
VCC = 5V
VREF = 5V
REF– = GND
VINCM = 2.5V
VIN(P-P) = 5V
FO = GND
TA = 25°C
MEASURED DATA
CALCULATED DATA
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