Datasheet LTC2415, LTC2415-1 (Analog Devices) - 10

LTC2415/LTC2415-1
PIN FUNCTIONS GND (Pins 1, 7, 8, 9, 10, 15, 16):
Ground. Multiple ground
SDO (Pin 12):
Three-State Digital Output. During the Data pins internally connected for optimum ground current Output period, this pin is used as serial data output. When flow and VCC decoupling. Connect each one of these pins the chip select CS is HIGH (CS = VCC) the SDO pin is in a to a ground plane through a low impedance connection. high impedance state. During the Conversion and Sleep All seven pins must be connected to ground for proper periods, this pin is used as the conversion status output. operation. The conversion status can be observed by pulling CS LOW.
VCC (Pin 2):
Positive Supply Voltage. Bypass to GND
SCK (Pin 13):
Bidirectional Digital Clock Pin. In Internal (Pin 1) with a 10µF tantalum capacitor in parallel with Serial Clock Operation mode, SCK is used as digital output 0.1µF ceramic capacitor as close to the part as possible. for the internal serial interface clock during the Data Output
REF+ (Pin 3), REF– (Pin 4):
Differential Reference Input. period. In External Serial Clock Operation mode, SCK is The voltage on these pins can have any value between used as digital input for the external serial interface clock GND and V during the Data Output period. A weak internal pull-up is CC as long as the reference positive input, REF+, is maintained more positive than the reference negative automatically activated in Internal Serial Clock Operation input, REF –, by at least 0.1V. mode. The Serial Clock Operation mode is determined by the logic level applied to the SCK pin at power up or during
IN+ (Pin 5), IN– (Pin 6):
Differential Analog Input. The the most recent falling edge of CS. voltage on these pins can have any value between GND – 0.3V and V
FO (Pin 14):
Frequency Control Pin. Digital input that CC + 0.3V. Within these limits the con- verter bipolar input range (V controls the ADC’s notch frequencies and conversion time. IN = IN+ – IN–) extends from –0.5 • (V When the FO pin is connected to VCC (LTC2415 only), the REF) to 0.5 • (VREF). Outside this input range the converter produces unique overrange and underrange converter uses its internal oscillator and the digital filter output codes. first null is located at 50Hz. When the FO pin is connected to GND (FO = OV), the converter uses its internal oscillator
CS (Pin 11):
Active LOW Digital Input. A LOW on this pin and the digital filter first null is located at 60Hz (LTC2415) enables the SDO digital output and wakes up the ADC. or simultaneous 50Hz/60Hz (LTC2415-1). When FO is Following each conversion, the ADC automatically enters driven by an external clock signal with a frequency fEOSC, the Sleep mode and remains in this low power state as the converter uses this signal as its system clock and the long as CS is HIGH. A LOW-to-HIGH transition on CS digital filter first null is located at a frequency fEOSC/2560. during the Data Output transfer aborts the data transfer and starts a new conversion. 2415fa 10 For more information www.linear.com/LTC2415 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Electrical Characteristics Pin Configuration Converter Characteristics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. (Notes 3,4) Analog Input and Reference The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. (Notes 3,4) Electrical Characteristics Digital Inputs and Digital Outputs The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. (Notes 3) Power Requirements The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. (Note 3) Analog Input and Reference The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. (Notes 3,4) Timing Characteristics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. (Notes 3,4) Typical Performance Characteristics Pin Functions Functional Block Diagram Test Circuits Applications Information Typical Applications PCB Layout and Film Package Description Revision History Typical Application Related Parts