Datasheet LTC2451 (Analog Devices) - 3

LTC2451
ANALOG INPUT AND REFERENCES The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. (Note 2) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V – + IN Input Voltage Range l VREF VREF V V + + – REF Positive Reference Voltage Range VREF – VREF ≥ 2.5V l VCC – 2.5 VCC V V – + – REF Negative Reference Voltage Range VREF – VREF ≥ 2.5V l 0 VCC – 2.5 V CIN IN Sampling Capacitance 0.35 pF IDC_LEAK(VIN) IN DC Leakage Current VIN = GND (Note 8) l –10 1 10 nA VIN = VCC (Note 8) l –10 1 10 nA IDC_LEAK(REF+, REF–) REF+, REF– DC Leakage Current VREF = 5V (Note 8) l –10 1 10 nA ICONV Input Sampling Current (Note 5) 50 nA
POWER REQUIREMENTS The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. (Note 2) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VCC Supply Voltage l 2.7 5.5 V ICC Supply Current Conversion l 400 700 µA Sleep l 0.2 0.5 µA
I2C INPUTS AND OUTPUTS The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VCC = 2.7V to 5.5V. (Note 2) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VIH High Level Input Voltage l 0.7VCC V VIL Low Level Input Voltage l 0.3VCC V VHYS Hysteresis of Schmidt Trigger Inputs (Note 3) l 0.05VCC V VOL Low Level Output Voltage (SDA) I = 3mA l 0.4 V IIN Input Leakage 0.1VCC ≤ VIN ≤ 0.9VCC l –1 1 µA CI Capacitance for Each I/O Pin l 10 pF CB Capacitance Load for Each Bus Line l 400 pF
I2C TIMING CHARACTERISTICS The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VCC = 2.7V to 5.5V. (Notes 2, 7) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
tCONV Conversion Time 30Hz Mode l 26 33.2 46 ms tCONV Conversion Time 60Hz Mode l 13 16.6 23 ms fSCL SCL Clock Frequency l 0 400 kHz tHD(SDA) Hold Time (Repeated) START Condition l 0.6 µs tLOW LOW Period of the SCL Pin l 1.3 µs tHIGH HIGH Period of the SCL Pin l 0.6 µs tSU(STA) Set-Up Time for a Repeated START Condition l 0.6 µs tHD(DAT) Data Hold Time l 0 0.9 µs tSU(DAT) Data Set-Up Time l 100 ns tr Rise Time for SDA/SCL Signals (Note 6) l 20 + 0.1CB 300 ns tf Fall Time for SDA/SCL Signals (Note 6) l 20 + 0.1CB 300 ns tSU(STO) Set-Up Time for STOP Condition l 0.6 µs tBUF Bus Free Time Between a STOP and START l 1.3 µs Condition 2451fg 3 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Analog Input And References Power Requirements I2C Inputs And Outputs I2C Timing Characteristics Typical Performance Characteristics Pin Functions Block Diagram Applications Information Typical Applications Package Description Revision History Typical Application Related Parts