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LTC2645 Datasheet(PDF) 11 Page - Linear Technology |
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LTC2645 Datasheet(HTML) 11 Page - Linear Technology |
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11 / 20 page  LTC2645 11 2645f For more information www.linear.com/LTC2645 pin FuncTions VCC (Pin 1): Supply Voltage Input. 2.7V ≤ VCC ≤ 5.5V. Bypass to GND with a 0.1µF capacitor. INA, INB, INC, IND (Pins 6, 5, 11, 10): PWM Inputs. Apply a pulse-width modulated input frequency between 30Hz and 6.25kHz (12-bit), 25kHz (10-bit) or 100kHz (8-bit). After each INX rising edge, the part calculates the duty cycle based upon the pulse width and period and updates DAC channel VOUTX. Logic levels are referenced to IOVCC. IOVCC (Pin 7): I/O Supply Voltage Input. 1.71V ≤ IOVCC ≤ 5.5V. Bypass to GND with a 0.1µF capacitor. IDLSEL (Pin 4): Idle Mode Select Input. Connect IDLSEL to GND or VCC to select the behavior of the DAC output when there has been no rising edge on the PWM input for more than the idle mode timeout delay t3 (nominal delay is 60ms). Available idle mode states are power-down with high impedance output, hold previous state, zero-scale or full-scale. This pin also selects the initial state of the DAC outputs following a power-on reset. PD (Pin 9): Active-Low Power-Down Input. Connect PD to GND to place the part in power-down with a typical supply currentof<1µA.ConnectPDtoIOVCCfornormaloperation. REFSEL(Pin13):ReferenceSelectInput.ConnectREFSEL toGNDtoselectinternalreferencemode.ConnectREFSEL to VCC to select external reference mode. REF (Pin 12): Reference Voltage Input or Output. When REFSEL is connected to VCC, REF is an input (1V ≤ VREF ≤ VCC) where the voltage supplied sets the full-scale DAC output voltage. When REFSEL is connected to GND, the 10ppm/°C, 1.25V internal reference (half full-scale) is available at the pin. This output may be bypassed to GND with up to 10µF and must be buffered when driving external DC load current. VOUTA, VOUTB, VOUTC, VOUTD (Pins 2, 3, 14, 15): DAC Analog Voltage Outputs. The DAC output voltage can be calculated by the following equation: VOUTX = VREF • tPWHX/tPERX where VREF is 2.5V in internal reference mode or the REF pin voltage in external reference mode, tPWHX is the pulse width of the preceding INX period and tPERX is the time between the two most recent INX rising edges. GND (Pins 8, 16): Ground. |
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