LTC2258-14 LTC2257-14/LTC2256-14 DigiTal inpuTs anD ouTpuTs The l denotes the specifications which apply over the full operatingtemperature range, otherwise specifications are at TA = 25°C. (Note 5)SYMBOL PARAMETERCONDITIONSMINTYPMAXUNITSENCODE INPUTS (ENC+, ENC– ) Differential Encode Mode (ENC– Not Tied to GND) VID Differential Input Voltage (Note 8) l 0.2 V VICM Common Mode Input Voltage Internally Set 1.2 V Externally Set (Note 8) l 1.1 1.6 V VIN Input Voltage Range ENC+, ENC– to GND l 0.2 3.6 V RIN Input Resistance (See Figure 10) 10 kΩ CIN Input Capacitance (Note 8) 3.5 pF Single-Ended Encode Mode (ENC– Tied to GND) VIH High Level Input Voltage VDD = 1.8V l 1.2 V VIL Low Level Input Voltage VDD = 1.8V l 0.6 V VIN Input Voltage Range ENC+ to GND l 0 3.6 V RIN Input Resistance (See Figure 11) 30 kΩ CIN Input Capacitance (Note 8) 3.5 pF DIGITAL INPUTS (CS, SDI, SCK) VIH High Level Input Voltage VDD = 1.8V l 1.3 V VIL Low Level Input Voltage VDD = 1.8V l 0.6 V IIN Input Current VIN = 0V to 3.6V l –10 10 µA CIN Input Capacitance (Note 8) 3 pF SDO OUTPUT (Open-Drain Output. Requires 2k Pull-Up Resistor if SDO is Used) ROL Logic Low Output Resistance to GND VDD = 1.8V, SDO = 0V 200 Ω IOH Logic High Output Leakage Current SDO = 0V to 3.6V l –10 10 µA COUT Output Capacitance (Note 8) 4 pF DIGITAL DATA OUTPUTS (CMOS MODES: FULL DATA RATE AND DOUBLE DATA RATE) OVDD = 1.8V VOH High Level Output Voltage IO = –500µA l 1.750 1.790 V VOL Low Level Output Voltage IO = 500µA l 0.010 0.050 V OVDD = 1.5V VOH High Level Output Voltage IO = –500µA 1.488 V VOL Low Level Output Voltage IO = 500µA 0.010 V OVDD = 1.2V VOH High Level Output Voltage IO = –500µA 1.185 V VOL Low Level Output Voltage IO = 500µA 0.010 V DIGITAL DATA OUTPUTS (LVDS MODE) VOD Differential Output Voltage 100Ω Differential Load, 3.5mA Mode l 247 350 454 mV 100Ω Differential Load, 1.75mA Mode 175 mV VOS Common Mode Output Voltage 100Ω Differential Load, 3.5mA Mode l 1.125 1.250 1.375 V 100Ω Differential Load, 1.75mA Mode 1.250 V RTERM On-Chip Termination Resistance Termination Enabled, OVDD = 1.8V 100 Ω 225814fc Fo F r o rmo m r o e r e inf n o f r o m r a m t a iton o n ww w w w . w line n a e r a .co c m o / m L / T L C T 2 C 2 2 5 2 8 5 - 8 1 - 4 1 5 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configurations Order Information Converter Characteristics Analog Input Dynamic Accuracy Internal Reference Characteristics Digital Inputs and Outputs Power Requirements Timing Characteristics Timing Diagrams Typical Performance Characteristics Pin Functions Functional Block Diagram Applications Information Typical Applications Package Description Revision History Related Parts
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