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LTC2754IUKG-12PBF Datasheet(PDF) 8 Page - Linear Technology |
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LTC2754IUKG-12PBF Datasheet(HTML) 8 Page - Linear Technology |
8 / 28 page LTC2754 8 2754f PIN FUNCTIONS GEADJA (Pin1): Gain Adjust Pin for DAC A. This control pin can be used to null gain error or to compensate for reference errors. Nominal adjustment range is ±512 LSB (LTC2754-16) for a voltage input range of ±VRINA (i.e., ±5V for a 5V reference input). Tie to ground if not used. RINA (Pin 2): Input Resistor for Reference Inverting Amplifier. The 20k input resistor is connected internally from RINA to RCOMA. For normal operation tie RINA to the external reference voltage VREFA(seeTypicalApplications). Any or all of these precision-matched resistor sets (Each set comprising RINX, RCOMX and REFX) may be used to invert one or more positive reference voltages to the nega- tive voltages needed by the DACs. Typically 5V; accepts up to ±15V. IOUT2A (Pin 3): DAC A Current Output Complement. Tie IOUT2A to ground. GND (Pin 4): Ground; provides shielding for IOUT2A. Tie to ground. CS/LD (Pin 5): Synchronous Chip Select and Load Pin. SDI (Pin 6): Serial Data Input. Data is clocked in on the rising edge of the serial clock (SCK) when CS/LD is low. SCK (Pin 7): Serial Clock. SRO (Pin 8): Serial Readback Output. Data is clocked out on the falling edge of SCK. Readback data begins clocking out after the last address bit A0 is clocked in. SRO is an active output only when the chip is selected (i.e., when CS/LD is low). Otherwise SRO presents a high-impedance output in order to allow other parts to control the bus. SROGND (Pin 9): Ground pin for SRO. Tie to ground. VDD (Pin 10): Positive Supply Input; 2.7V ≤ VDD ≤ 5.5V. By- pass with a 0.1μF low-ESR ceramic capacitor to ground. GND (Pin 11): Ground. Tie to ground. IOUT2D (Pin 12): DAC D Current Output Complement. Tie IOUT2D to ground. RIND (Pin 13): Input Resistor for Reference Inverting Amplifier. The 20k input resistor is connected inter- nally from RIND to RCOMD. For normal operation tie RIND to the external reference voltage VREFD (see Typical Applications). Any or all of these precision-matched resis- tor sets (Each set comprising RINX, RCOMX and REFX) may be used to invert one or more positive reference voltages to the negative voltages needed by the DACs. Typically 5V; accepts up to ±15V. GEADJD (Pin 14): Gain Adjust Pin for DAC D. This control pin can be used to null gain error or to compensate for reference errors. Nominal adjustment range is ±512 LSB (LTC2754-16) for a voltage input range of ±VRIND (i.e., ±5V for a 5V reference input). Tie to ground if not used. RCOMD (Pin 15): Center Tap Point for Reference Amplifier Inverting Resistors. The 20k reference inverting resistors are connected internally from RIND to RCOMD and from RCOMD to REFD, respectively (see Block Diagram). For normal operation tie RCOMDtothenegativeinputofexternal reference inverting amplifier (see Typical Applications). REFD (Pin 16): Inverted Reference Voltage for DAC D, with internal connection to the reference inverting resistor. The 20k resistor is connected internally from REFD to RCOMD. For normal operation tie this pin to the output of reference inverting amplifier (see Typical Applications). Typically –5V; accepts up to ±15V. The impedance looking into this pin is 10k to ground (RIND and RCOMD floating). ROFSD (Pin 17): Bipolar Offset Network for DAC D. This pin provides the translation of the output voltage range for bipolar spans. Accepts up to ±15V; for normal operation tie to the positive reference voltage at RIND (Pin 13). The impedance looking into this pin is 20k to ground. RFBD (Pin 18): DAC D Feedback Resistor. For normal operation tie to the output of the I/V converter amplifier for DAC D (see Typical Applications). The DAC output current from IOUT1D flows through the feedback resistor to the RFBD pin. The impedance looking into this pin is 10k to ground. IOUT1D (Pin 19): DAC D Current Output. This pin is a virtual ground when the DAC is operating and should reside at 0V. For normal operation tie to the negative input of the I/V converter amplifier for DAC D (see Typi- cal Applications). |
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