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| 型號： | DC1009A-B |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 18/30頁 |
| 文件大小： | 0K |
| 描述： | BOARD DELTA SIGMA ADC LTC2488 |
| 軟件下載： | QuikEval System |
| 設(shè)計(jì)資源： | DC1009A Design File DC1009A Schematic |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | Easy Drive™, QuikEval™ |
| ADC 的數(shù)量： | 1 |
| 位數(shù)： | 16 |
| 采樣率（每秒）： | 6.9 |
| 數(shù)據(jù)接口： | MICROWIRE?，串行，SPI? |
| 已用 IC / 零件： | LTC2488 |
| 已供物品： | 板 |
| 相關(guān)產(chǎn)品： | LTC2488CDE#TRPBF-ND - IC ADC 16BIT DELTA SIG 14-DFN LTC2488IDE#TRPBF-ND - IC ADC 16BIT DELTA SIG 14-DFN LTC2488CDE#PBF-ND - IC ADC 16BIT DELTA SIG 14-DFN LTC2488IDE#PBF-ND - IC ADC 16BIT DELTA SIG 14-DFN |
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LTC2488
25
2488fa
APPLICATIONS INFORMATION
proprietary architecture used for the LTC2488 third order
modulator resolves this problem and guarantees stability
with input signals 150% of full-scale. In many industrial
applications, it is not uncommon to have microvolt level
signals superimposed over unwanted error sources with
several volts of peak-to-peak noise. Figure 19 shows mea-
surement results for the rejection of a 7.5V peak-to-peak
noise source (150% of full scale) applied to the LTC2488.
From this curve, it is shown that the rejection performance
is maintained even in extremely noisy environments.
Output Data Rate
When using its internal oscillator, the LTC2488 produces up
to 6.9 samples per second (sps) with a notch frequency of
55Hz. The actual output data rate depends upon the length
of the sleep and data output cycles which are controlled
by the user and can be made insignicantly short. When
operating with an external conversion clock (FO connected
to an external oscillator), the LTC2488 output data rate
can be increased. The duration of the conversion cycle is
41036/fEOSC. If fEOSC = 307.2kHz, the converter behaves
as if the internal oscillator is used.
An increase in fEOSC over the nominal 307.2kHz will trans-
late into a proportional increase in the maximum output
data rate (up to a maximum of 100sps). The increase in
output rate leads to degradation in offset, full-scale error,
and effective resolution as well as a shift in frequency
rejection.
A change in fEOSC results in a proportional change in the
internal notch position. This leads to reduced differential
mode rejection of line frequencies. The common mode
rejection of line frequencies remains unchanged, thus fully
differential input signals with a high degree of symmetry
on both the IN+ and IN– pins will continue to reject line
frequency noise.
An increase in fEOSC also increases the effective dynamic
input and reference current. External RC networks will
continue to have zero differential input current, but the
time required for complete settling (580ns for fEOSC =
307.2kHz) is reduced, proportionally.
Once the external oscillator frequency is increased above
1MHz (a more than 3x increase in output rate) the effective-
INPUT SIGNAL FREQUENCY (Hz)
250fN 252fN 254fN 256fN 258fN 260fN 262fN
INPUT
NORMAL
MODE
REJECTION
(dB)
2488 F17
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
Figure 17. Input Normal Mode Rejection at fS = 256 fN
INPUT FREQUENCY (Hz)
0
NORMAL
MODE
REJECTION
(dB)
2488 F18
0
–20
–40
–60
–80
–100
–120
VCC = 5V
VREF = 5V
VIN(CM) = 2.5V
TA = 25°C
VIN(P-P) = 5V
VIN(P-P) = 7.5V
(150% OF FULL SCALE)
12.5 25 37.5 50 62.5 75 87.5 100 112.5 125 137.5 150 162.5 175 187.5 200
Figure 18. Input Normal Mode Rejection vs Input Frequency with
Input Perturbation of 100% (50Hz/60Hz Notch)
INPUT FREQUENCY (Hz)
0
12.5 25 37.5 50 62.5 75 87.5 100 112.5 125 137.5 150 162.5 175 187.5 200
NORMAL
MODE
REJECTION
(dB)
2488 F19
0
–20
–40
–60
–80
–100
–120
VCC = 5V
VREF = 5V
VIN(CM) = 2.5V
VIN(P-P) = 5V
TA = 25°C
MEASURED DATA
CALCULATED DATA
Figure 19. Measure Input Normal Mode Rejection vs Input
Frequency with Input Perturbation of 150% (60Hz Notch)
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| DC1009A-C | 功能描述:BOARD DELTA SIGMA ADC LTC2486 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - 模數(shù)轉(zhuǎn)換器 (ADC) 系列:Easy Drive™, QuikEval™ 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- ADC 的數(shù)量:1 位數(shù):12 采樣率（每秒）:94.4k 數(shù)據(jù)接口:USB 輸入范圍:±VREF/2 在以下條件下的電源（標(biāo)準(zhǔn)）:- 工作溫度:-40°C ~ 85°C 已用 IC / 零件:MAX11645 已供物品:板，軟件 |
| DC100A10 | 功能描述:固態(tài)繼電器-工業(yè)安裝 SSR DC OUTPUT 10A 90-140VAC RoHS:否 制造商:Crydom 控制電壓范圍:4 VDC to 32 VDC 負(fù)載電壓額定值:7 VDC to 72 VDC 負(fù)載電流額定值:160 A 觸點(diǎn)形式: 輸出設(shè)備:SSR 安裝風(fēng)格:Panel |
| DC100A10C | 功能描述:固態(tài)繼電器-工業(yè)安裝 SSR DC OUTPUT 10A 90-140VAC RoHS:否 制造商:Crydom 控制電壓范圍:4 VDC to 32 VDC 負(fù)載電壓額定值:7 VDC to 72 VDC 負(fù)載電流額定值:160 A 觸點(diǎn)形式: 輸出設(shè)備:SSR 安裝風(fēng)格:Panel |
| DC100A20 | 功能描述:固態(tài)繼電器-工業(yè)安裝 SSR DC OUTPUT 20A 90-140VAC RoHS:否 制造商:Crydom 控制電壓范圍:4 VDC to 32 VDC 負(fù)載電壓額定值:7 VDC to 72 VDC 負(fù)載電流額定值:160 A 觸點(diǎn)形式: 輸出設(shè)備:SSR 安裝風(fēng)格:Panel |
| DC100A20C | 功能描述:固態(tài)繼電器-工業(yè)安裝 SSR DC OUTPUT 20A 90-140VAC RoHS:否 制造商:Crydom 控制電壓范圍:4 VDC to 32 VDC 負(fù)載電壓額定值:7 VDC to 72 VDC 負(fù)載電流額定值:160 A 觸點(diǎn)形式: 輸出設(shè)備:SSR 安裝風(fēng)格:Panel |
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