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LTC2499 Datasheet(PDF) 18 Page - Linear Technology |
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LTC2499 Datasheet(HTML) 18 Page - Linear Technology |
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18 / 32 page  LTC2499 18 2499fb 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. A new configuration can be loaded into the device by setting EN2 = 1 (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 temperature sensor rather than the selected input channel. The next two bits (FA and FB) are used to set the rejection frequency. The final 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). When IM = 1 (temperature measurement) SPD 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 LTC2499 includes a high accuracy on-chip oscillator with no required external components. Coupled with an integrated fourth order digital low pass filter, the LTC2499 rejects line frequency noise. In the default mode, the LTC2499 simultaneously rejects 50Hz and 60Hz by at least 87dB. If more rejection is required, the LTC2499 can be configured to reject 50Hz or 60Hz to better than 110dB. Table 4. Converter Configuration 1 0 EN SGL ODD A2 A1 A0 EN2 IM FA FB SPD CONVERTER CONFIGURATION 1 0 0 XXXXXXXXXX Keep Previous 1 0 1 XXXXX 0 XXXX Keep Previous 0 0 1 XXXXXXXXXX Keep Previous 1 0 1 XXXXX 10000 External Input (See Table 3) 50Hz/60Hz Rejection, 1x 1 0 1 XXXXX 10010 External Input (See Table 3) 50Hz Rejection, 1x 1 0 1 XXXXX 10100 External Input (See Table 3) 60Hz Rejection, 1x 1 0 1 XXXXX 10001 External Input (See Table 3) 50Hz/60Hz Rejection, 2x 1 0 1 XXXXX 10011 External Input (See Table 3) 50Hz Rejection, 2x 1 0 1 XXXXX 10101 External Input (See Table 3) 60Hz Rejection, 2x 1 0 1 XXXXX 1100 X Measure Temperature 50Hz/60Hz Rejection, 1x 1 0 1 XXXXX 1101 X Measure Temperature 50Hz Rejection, 1x 1 0 1 XXXXX 1110 X Measure Temperature 60Hz Rejection, 1x 1 0 1 XXXXX 1 X 1 1 X Reserved, Do Not Use APPLICATIONS INFORMATION |
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