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LTC2488 Datasheet(PDF) 8 Page - Linear Technology |
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LTC2488 Datasheet(HTML) 8 Page - Linear Technology |
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8 / 30 page  LTC2488 8 2488fb For more information www.linear.com/LTC2488 PIN FUNCTIONS FO(Pin1):FrequencyControlPin.Digitalinputthatcontrols theinternalconversionclockrate.WhenFOisconnectedto ground, the converter uses its internal oscillator running at 307.2kHz. The conversion clock may also be overridden by driving the FO pin with an external clock in order to change the output rate and the digital filter rejection null. SDI (Pin 2): Serial Data Input. This pin is used to select the input channel. The serial data input is applied under control of the serial clock (SCK) during the data output/ input operation. The first conversion following a new input is valid. SCK(Pin3):Bidirectional,DigitalI/O,ClockPin.InInternal Serial Clock Operation mode, SCK is generated internally and is seen as an output on the SCK pin. In External Serial Clock Operation mode, the digital I/O clock is externally applied to the SCK pin. The Serial Clock operation mode is determined by the logic level applied to the SCK pin at power up and during the most recent falling edge of CS. CS(Pin4):ActiveLOWChipSelect.ALOWonthispinenables the digital input/output and wakes up the ADC. Following each conversion, the ADC automatically enters the Sleep mode and remains in this low power state as long as CS is HIGH. A LOW-to-HIGH transition on CS during the data output aborts the data transfer and starts a new conversion. SDO (Pin 5): Three-State Digital Output. During the data output period, this pin is used as the serial data output. When the chip select pin is HIGH, the SDO pin is in a high impedancestate.Duringtheconversionandsleepperiods, this pin is used as the conversion status output. When the conversion is in progress this pin is HIGH; once the conversion is complete SDO goes low. The conversion status is monitored by pulling CS LOW. GND(Pin6):Ground.Connectthispintoacommonground plane through a low impedance connection. COM (Pin 7): The common negative input (IN–) for all single ended multiplexer configurations. The voltage on CH0 to CH3 and COM pins can have any value between GND – 0.3V to VCC + 0.3V. Within these limits, the two selected inputs (IN+ and IN–) provide a bipolar input range (VIN = IN+ – IN–) from –0.5 • VREF to 0.5 • VREF. Outside thisinputrange,theconverterproducesuniqueover-range and under-range output codes. CH0 to CH3 (Pins 8-11): Analog Inputs. May be pro- grammed for single-ended or differential mode. VCC(Pin12):PositiveSupplyVoltage.BypasstoGNDwith a 10µF tantalum capacitor in parallel with a 0.1µF ceramic capacitor as close to the part as possible. REF+(Pin13),REF–(Pin14):DifferentialReferenceInput. The voltage on these pins can have any value between GND and VCC as long as the reference positive input, REF+, remains more positive than the negative reference input, REF–, by at least 0.1V. The differential voltage (VREF = REF+ – REF–) sets the fullscale range for all input channels. Exposed Pad (Pin 15): Ground. This pin is ground and mustbesolderedtothePCBgroundplane.Forprototyping purposes, this pin may remain floating. |
Similar Part No. - LTC2488_15 |
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Similar Description - LTC2488_15 |
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