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LTC2452IDDB-TRMPBF Datasheet(PDF) 8 Page - Linear Technology |
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LTC2452IDDB-TRMPBF Datasheet(HTML) 8 Page - Linear Technology |
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8 / 20 page  LTC2452 8 2452fb APPLICATIONS INFORMATION Ease of Use The LTC2452 data output has no latency, filter settling delay or redundant results associated with the conversion cycle. There is a one-to-one correspondence between the conver- sion and the output data. Therefore, multiplexing multiple analog input voltages requires no special actions. The LTC2452 performs offset calibrations every conver- sion. This calibration is transparent to the user and has no effect upon the cyclic operation described previously. The advantage of continuous calibration is stability of the ADC performance with respect to time and temperature. The LTC2452 includes a proprietary input sampling scheme that reduces the average input current by several orders of magnitude when compared to traditional delta-sigma architectures. This allows external filter networks to in- terface directly to the LTC2452. Since the average input sampling current is 50nA, an external RC lowpass filter using 1kΩ and 0.1μF results in <1LSB additional error. Additionally, there is negligible leakage current between IN+ and IN–. Reference Voltage Range The LTC2453 reference input range is 2.5V to VCC. For the simplest operation, REF can be shorted to VCC. Input Voltage Range As mentioned in the Output Data Format section, the output code is given as 32768•VIN/VREF + 32768. For VIN ≥ VREF, the output code is clamped at 65535 (all ones). For VIN ≤ –VREF, the output code is clamped at 0 (all zeroes). Figure 3. Output Code vs VIN+ with VIN– = 0 The LTC2452 includes a proprietary system that can, typically, digitize each input 8LSB above VREF and below GND, if the differential input is within ±VREF. As an ex- ample (Figure 3), if the user desires to measure a signal slightly below ground, the user could set VIN– = GND, and VREF = 5V. If VIN+ = GND, the output code would be approximately 32768. If VIN+ = GND – 8LSB = –1.22 mV, the output code would be approximately 32760. Output Data Format The LTC2452 generates a 16-bit direct binary encoded result. It is provided as a 16-bit serial stream through the SDO output pin under the control of the SCK input pin (see Figure 4). Letting VIN = (VIN+ – VIN–), the output code is given as 32768•VIN/VREF + 32768. The first bit output by the LTC2452, D15, is the MSB, which is 1 for VIN+ ≥ VIN– and 0 for VIN+ < VIN–. This bit is followed by successively less significant bits (D14, D13...) until the LSB is output by the LTC2452. Table 1 shows some example output codes. Table 1. LTC2452 Output Data Format DIFFERENTIAL INPUT VOLTAGE VIN+ – VIN– D15 (MSB) D14 D13 D12...D2 D1 D0 (LSB) CORRESPONDING DECIMAL VALUE ≥VREF 1 1 1 1 1 1 65535 VREF – 1LSB 1 1 1 1 1 0 65534 0.5•VREF 1 1 0 0 0 0 49152 0.5•VREF – 1LSB 1 0 1 1 1 1 49151 0 1 0 0 0 0 0 32768 –1LSB 0 1 1 1 1 1 32767 –0.5•VREF 0 1 0 0 0 0 16384 –0.5•VREF – 1LSB 0 0 1 1 1 1 16383 ≤ –VREF 00 0 0 0 0 0 VIN +/VREF+ –0.001 4 12 20 0.001 2452 F03 –4 –12 0 8 16 –8 –16 –20 –0.005 0 0.005 0.0015 SIGNALS BELOW GND |
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