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參數(shù)資料
| 型號： | LTC2495CUHF#TR |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | ADC |
| 英文描述： | 16-CH 16-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PQCC38 |
| 封裝： | 5 X 7 MM, PLASTIC, MO-220WKHD, QFN-38 |
| 文件頁數(shù)： | 10/32頁 |
| 文件大?。?/td> | 619K |
| 代理商： | LTC2495CUHF#TR |
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LTC2495
2495fa
The first bit of the second word is the enable bit for the
conversion configuration (EN2). If this bit is set to 0, then
the next conversion is performed using the previously
selected converter configuration.
If the EN2 bit is set to a 1, a new configuration can be
loaded into the device (see Table 4). The first bit (IM) is
used to select the internal temperature sensor. If IM = 1,
the following conversion will be performed on the internal
temperaturesensorratherthantheselectedinputchannel.
The next two bits (FA and FB) are used to set the rejection
frequency. The next bit (SPD) is used to select either the
1x output rate if SPD = 0 (auto-calibration is enabled and
the offset is continuously calibrated and removed from
the final conversion result) or the 2x output rate if SPD =
1 (offset calibration disabled, multiplexing output rates up
to 15Hz with no latency). The final three bits (GS2, GS1,
GS0) are used to set the gain. When IM = 1 (temperature
measurement) SPD, GS2, GS1 and GS0 will be ignored
and the device will operate in 1x mode.
The configuration remains valid until a new input word
with EN = 1 (the first three bits are 101 for the first word)
and EN2 = 1 (for the second write byte) is shifted into
the device.
Rejection Mode (FA, FB)
The LTC2495 includes a high accuracy on-chip oscillator
with no required external components. Coupled with an
integrated fourth order digital low pass filter, the LTC2495
rejects line frequency noise. In the default mode, the
LTC2495 simultaneously rejects 50Hz and 60Hz by at least
87dB. If more rejection is required, the LTC2495 can be
configured to reject 50Hz or 60Hz to better than 110dB.
applicaTions inFormaTion
Table 4. Converter Configuration
1
EN SGL ODD A2 A1 A0 EN2 IM
FA
FB
SPD GS2 GS1 GS0
CONVERTER CONFIGURATION
1
0
Any
Input
Channel
X
keep Previous
1
0
1
0
X
keep Previous
1
0
1
0
Any
Rejection
Mode
0
External Input, Gain = 1, Autocalibration
1
0
1
0
1
External Input, Gain = 4, Autocalibration
1
0
1
0
1
0
External Input, Gain = 8, Autocalibration
1
0
1
0
1
External Input, Gain = 16, Autocalibration
1
0
1
0
1
0
External Input, Gain = 32, Autocalibration
1
0
1
0
1
0
1
External Input, Gain = 64, Autocalibration
1
0
1
0
1
0
External Input, Gain = 128, Autocalibration
1
0
1
0
1
External Input, Gain = 264, Autocalibration
1
0
1
0
1
0
External Input, Gain = 1, 2x Speed
1
0
1
0
1
0
1
External Input, Gain = 2, 2x Speed
1
0
1
0
1
0
1
0
External Input, Gain = 4, 2x Speed
1
0
1
0
1
0
1
External Input, Gain = 8, 2x Speed
1
0
1
0
1
0
External Input, Gain = 16, 2x Speed
1
0
1
0
1
0
1
External Input, Gain = 32, 2x Speed
1
0
1
0
1
0
External Input, Gain = 64, 2x Speed
1
0
1
0
1
External Input, Gain = 128, 2x Speed
1
0
1
0
Any
Speed
Any
Gain
External Input, Simultaneous 50Hz/60Hz Rejection
1
0
1
0
1
External Input, 50Hz Rejection
1
0
1
0
1
0
External Input, 60Hz Rejection
1
0
1
0
1
Reserved, Do Not Use
1
0
1
0
X
Temperature Input, Simultaneous 50Hz/60Hz Rejection
1
0
1
0
1
X
Temperature Input, 50Hz Rejection
1
0
1
0
X
Temperature Input, 60Hz Rejection
1
0
1
X
Reserved, Do Not Use
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