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LTC2752BCLX-PBF Datasheet(PDF) 10 Page - Linear Technology |
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LTC2752BCLX-PBF Datasheet(HTML) 10 Page - Linear Technology |
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10 / 24 page  LTC2752 0 2752f pin FuncTions S2 (Pin 25): Span Bit 2 Input. In Manual Span mode (M- SPAN tied to VDD), pins S0, S1 and S2 are pin-strapped to select a single fixed output range for all DACs. These pins should be tied to either GND or VDD even if they are unused. LDAC (Pin 26): Asynchronous DAC Load Input. When LDAC is a logic low, all DACs are updated (CS/LD must be high). IOUT2BF, IOUT2BS (Pins 28, 29): DAC B Current Output Complement Force and Sense Pins. Tie to ground via a clean, low impedance path. These pins may be used with a precision ground buffer amp as a Kelvin sensing pair (see the Typical Applications section). RINB(Pins31,32):InputResistorfortheExternalReference Inverting Amplifier. The 20k input resistor is connected internally from RINB to RCOMB. For normal operation tie RINB to the external positive reference voltage (see Typical Applications). Either or both of these precision matched resistor sets (each set comprising RINX, RCOMX and REFX) may be used to invert positive references to provide the negative voltages needed by the DACs. Typically 5V; ac- cepts up to ±15V. Pins 31 and 32 are internally shorted together. GEADJB (Pin 33): Gain Adjust Pin for DAC B. This control pin can be used to null gain error or to compensate for reference errors. The gain change expressed in LSB is the same for any output range. See System Offset and Gain Adjustments in the Operation section. Tie to ground if not used. RCOMB (Pin 34): Virtual Ground Point for the DAC B Ref- erence Amplifier Inverting Resistors. The 20k reference inverting resistors are connected internally from RINB to RCOMB and from RCOMB to REFB, respectively (see Block Diagram). For normal operation tie RCOMB to the negative input of the external reference inverting amplifier (see Typical Applications). REFB (Pins 35, 36): Feedback Resistor for the DAC B Reference Inverting Amplifier, and Reference Input for DAC B. The 20k feedback resistor is connected internally from REFB to RCOMB. For normal operation tie this pin to the output of the DAC B reference inverting amplifier (see Typical Applications). Typically –5V; accepts up to ±15V. Pins 35 and 36 are internally shorted together. ROFSB (Pins 37, 38): Bipolar Offset Resistor for DAC B. These pins provide the translation of the output voltage range for bipolar spans. Accepts up to ±15V; for normal operation tie to the positive reference voltage at RINB (Pins 31, 32). Pins 37 and 38 are internally shorted together. RFBB (Pins 39, 40): DAC B Feedback Resistor. For normal operation tie to the output of the I/V converter amplifier for DAC B (see Typical Applications). The DAC output current fromIOUT1BflowsthroughthefeedbackresistortotheRFBB pins. Pins 39 and 40 are internally shorted together. IOUT1B (Pin 41): DAC B 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 B (see Typical Applications). VOSADJB (Pin 42): DAC B Offset Adjust Pin. This voltage controlpincanbeusedtonullunipolaroffsetorbipolarzero error. The offset change expressed in LSB is the same for anyoutputrange.SeeSystemOffsetandGainAdjustments in the Operation section. Tie to ground if not used. VOSADJA (Pin 43): DAC A Offset Adjust Pin. This voltage controlpincanbeusedtonullunipolaroffsetorbipolarzero error. The offset change expressed in LSB is the same for anyoutputrange.SeeSystemOffsetandGainAdjustments in the Operation section. Tie to ground if not used. IOUT1A (Pin 44): DAC A 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 A (see Typical Applications). RFBA (Pins 45, 46): DAC A Feedback Resistor. For normal operation tie to the output of the I/V converter amplifier for DAC A (see Typical Applications). The DAC output current fromIOUT1AflowsthroughthefeedbackresistortotheRFBA pins. Pins 45 and 46 are internally shorted together. ROFSA (Pins 47, 48): Bipolar Offset Resistor for DAC A. 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 RINA (Pins 5, 6). Pins 47 and 48 are internally shorted together. |
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