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AD7151BRMZ-REEL Arkusz danych(PDF) 4 Page - Analog Devices |
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AD7151BRMZ-REEL Arkusz danych(HTML) 4 Page - Analog Devices |
4 / 28 page AD7151 Rev. 0 | Page 4 of 28 Parameter Min Typ Max Unit1 Test Conditions/Comments POWER REQUIREMENTS VDD-to-GND Voltage 2.7 3.6 V VDD = 3.3 V, nominal IDD Current4 70 80 μA IDD Current Power-Down Mode4 1 5 μA Temperature ≤ 25°C 3 10 μA Temperature = 85°C 1 Capacitance units: one picofarad (1 pF) = 1 × 10−12 farad (F); one femtofarad (1 fF) = 10−15 farad (F). 2 The CAPDAC can be used to shift (offset) the input range. The total capacitance of the sensor can, therefore, be up to the sum of the CAPDAC value and the conversion input range. With the autoCAPDAC feature, the CAPDAC is adjusted automatically when the CDC input value is lower than 25% or higher than 75% of the CDC nominal input range. 3 Specification is not production tested but is supported by characterization data at initial product release. 4 Digital inputs equal to VDD or GND. TIMING SPECIFICATIONS VDD = 2.7 V to 3.6 V; GND = 0 V; Input Logic 0 = 0 V; Input Logic 1 = VDD; –40°C to +85°C, unless otherwise noted. Table 2. Parameter Min Typ Max Unit Test Conditions/Comments CONVERTER Conversion Time 10 ms Wake-Up Time from Power-Down Mode1, 2 0.3 ms Power-Up Time1, 3 2 ms Reset Time1, 4 2 ms SERIAL INTERFACE5, 6 See Figure 2. SCL Frequency 0 400 kHz SCL High Pulse Width, tHIGH 0.6 μs SCL Low Pulse Width, tLOW 1.3 μs SCL, SDA Rise Time, tR 0.3 μs SCL, SDA Fall Time, tF 0.3 μs Hold Time (Start Condition), tHD;STA 0.6 μs After this period, the first clock is generated. Setup Time (Start Condition), tSU;STA 0.6 μs Relevant for repeated start condition. Data Setup Time, tSU;DAT 0.1 μs Setup Time (Stop Condition), tSU;STO 0.6 μs Data Hold Time (Master), tHD;DAT 10 ns Bus-Free Time (Between Stop and Start Condition), tBUF 1.3 μs 1 Specification is not production tested but is supported by characterization data at initial product release. 2 Wake-up time is the maximum delay between the last SCL edge writing the configuration register and the start of conversion. 3 Power-up time is the maximum delay between the VDD crossing the minimum level (2.7 V) and either the start of conversion or when ready to receive a serial interface command. 4 Reset time is the maximum delay between the last SCL edge writing the reset command and either the start of conversion or when ready to receive a serial interface command. 5 Sample tested during initial release to ensure compliance. 6 All input signals are specified with input rise/fall times = 3 ns, measured between the 10% and 90% points. Timing reference points at 50% for inputs and outputs. Output load = 10 pF. P S tLOW tR tF tHD;STA tHD;DAT tSU;DAT tSU;STA tHD;STA tSU;STO tHIGH SCL PS SDA tBUF Figure 2. Serial Interface Timing Diagram |
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