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LT1236A-10 Datasheet(PDF) 10 Page - Linear Technology |
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LT1236A-10 Datasheet(HTML) 10 Page - Linear Technology |
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10 / 24 page  LTC2753 10 2753f PIN FUNCTIONS RCOM (Pin 1): Center Tap Point for the Reference Inverting Resistors. The 20k reference inverting resistors R1 and R2 are connected internally from RIN to RCOM and from RCOM to REFA, respectively (see Block Diagram). For normal operation tie RCOM to the negative input of the external reference inverting amplifier (see Typical Applications). RIN (Pin 2): Input Resistor R1 of the Reference Inverting Resistors. The 20k resistor R1 is connected internally from RIN to RCOM. For normal operation tie RIN to the external reference voltage VREF. Typically 5V; accepts up to ±15V. S2 (Pin 3): Span I/O Bit 2. Pins S0, S1 and S2 are used to program and to read back the output ranges of the DACs. IOUT2A (Pin 4): DAC A Current Output Complement. Tie IOUT2A to ground. GND (Pin 5): Shield Ground, provides necessary shielding for IOUT2A. Tie to ground. D3-D11 (Pins 6-14): LTC2753-12 Only. DAC Input/Output Data Bits. These I/O pins set and read back the DAC code. D11 is the MSB. D5-D13 (Pins 6-14): LTC2753-14 Only. DAC Input/Output Data Bits. These I/O pins set and read back the DAC code. D13 is the MSB. D7-D15 (Pins 6-14): LTC2753-16 Only. DAC Input/Output Data Bits. These I/O pins set and read back the DAC code. D15 is the MSB. VDD (Pin 15): Positive Supply Input 2.7V ≤ VDD ≤ 5.5V. Requires a 0.1μF bypass capacitor to GND. NC (Pin 16): No Internal Connection. A1 (Pin 17): DAC Address Bit 1. See Table 3. A0 (Pin 18): DAC Address Bit 0. See Table 3. GND (Pin 19): Ground. Tie to ground. CLR (Pin 20): Asynchronous Clear. When CLR is taken to a logic low, the data registers are reset to the zero-volt code for the present output range (VOUT = 0V). MSPAN (Pin 21): Manual Span Control Pin. MSPAN is used to configure the LTC2753 for operation in a single, fixed output range. When configured for single-span operation, the output range is set via hardware pin strapping. The input and DAC registers of the span I/O port are transparent and do not respond to write or update commands. To configure the part for single-span use, tie MSPAN directly to VDD. If MSPAN is instead connected to GND (SoftSpan configuration), the output ranges are set and verified by using write, update and read operations. See Manual Span Configuration in the Operation section. MSPAN must be connected either directly to GND (SoftSpan configuration) or VDD (single-span configuration). D0-D2 (Pins 22-24): LTC2753-12 Only. DAC Input/Output Data Bits. These I/O pins set and read back the DAC code. D0 is the LSB. D0-D4 (Pins 22-26): LTC2753-14 Only. DAC Input/Output Data Bits. These I/O pins set and read back the DAC code. D0 is the LSB. D0-D6 (Pins 22-28): LTC2753-16 Only. DAC Input/Output Data Bits. These I/O pins set and read back the DAC code. D0 is the LSB. NC (Pins 25-30): LTC2753-12 Only. No Internal Connection. NC (Pins 27-30): LTC2753-14 Only. No Internal Connection. NC (Pins 29, 30): LTC2753-16 Only. No Internal Con- nection. GND (Pin 31): Shield Ground, provides necessary shielding for IOUT2B. Tie to ground. IOUT2B (Pin 32): DAC B Current Output Complement. Tie IOUT2B to ground. S0 (Pin 33): Span I/O Bit 0. Pins S0, S1 and S2 are used to program and to read back the output range of the DACs. D/S (Pin 34): Data/Span Select. This pin is used to select the data I/O pins or the span I/O pins (D0 to D15 or S0 to S2, respectively), along with their respective dedicated registers, for write or read operations. Update operations ignore D/S, since all updates affect both data and span registers. For single-span operation, tie D/S to ground. READ (Pin 35): Read Pin. When READ is asserted high, the data I/O pins (D0-D15) or span I/O pins (S0-S2) |
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