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Line 584: − − === Thermal Diode === − The DAC has a built in thermal diode. The diode drop from anode to cathode is 0.65V at 25°C. It changes at a rate of -2.20mV/°C. The anode of this diode is connected to the +5V power island, and the cathode is connected to a 270K resistor to ground. The voltage between the cathode and the resistor is connected to VIN1 (pin 15) on the ADC). − − === Pinout Table === − See documentation from Analog Devices. Line 598:
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Digital control board documentation (view source)
Revision as of 19:57, 15 June 2009
, 19:57, 15 June 2009→DAC: rearranged sections
=== Power Details ===
=== Power Details ===
The DAC is primarily powered by the +5V power island, regulated by an off-board power supply and extensively decoupled in the area of the DAC. The DAC also requires -5V, and a high voltage as discussed in [[#Power Requirements | Power Requirements]]. Both of these voltages are supplied by an off-board supply and decoupled near the DAC. In addition to these voltage levels, the DAC requires a precise +2.5V reference, created by the shunt-type voltage reference VR4.
The DAC is primarily powered by the +5V power island, regulated by an off-board power supply and extensively decoupled in the area of the DAC. The DAC also requires -5V, and a high voltage as discussed in [[#Power Requirements | Power Requirements]]. Both of these voltages are supplied by an off-board supply and decoupled near the DAC. In addition to these voltage levels, the DAC requires a precise +2.5V reference, created by the shunt-type voltage reference VR4.
=== Setting the Output Range ===
=== Setting the Output Range ===
If relevant, R13 is a 100K resistor.
If relevant, R13 is a 100K resistor.
=== Thermal Diode ===
The DAC has a built in thermal diode. The diode drop from anode to cathode is 0.65V at 25°C. It changes at a rate of -2.20mV/°C. The anode of this diode is connected to the +5V power island, and the cathode is connected to a 270K resistor to ground. The voltage between the cathode and the resistor is connected to VIN1 (pin 15) on the ADC).
=== Pinout Table ===
See documentation from Analog Devices.
=== Channel Mapping ===
=== Channel Mapping ===