Line 68: |
Line 68: |
| | AD7928 | | | AD7928 |
| | VDRIVE | | | VDRIVE |
− | | ??? CMOS logic tolerance | + | | ±0.3V |
| | 200uA | | | 200uA |
| | Logic output driver | | | Logic output driver |
Line 93: |
Line 93: |
| | Digital supply pin | | | Digital supply pin |
| | | | | |
| + | |- |
| + | | XC3S50A |
| + | | VCCAUX |
| + | | ±0.3V |
| + | | Varies |
| + | | Auxiliary power supply |
| + | | FPGA program greatly affects power requirements |
| + | |- |
| + | | XC3S50A |
| + | | VCCO |
| + | | ±0.3V |
| + | | Varies |
| + | | Auxiliary power supply |
| + | | FPGA program greatly affects power requirements |
| |- | | |- |
| |} | | |} |
| | | |
| + | === ICs requiring 2.5V === |
| + | {| cellspacing=3 border=1 | |
| + | |'''IC Name''' |
| + | |'''Pin Name''' |
| + | |'''Tolerance''' |
| + | |'''Current Requirements''' |
| + | |'''Description''' |
| + | |'''Notes''' |
| + | |- |
| + | | AD7928 |
| + | | REF_IN |
| + | | ±1% (±0.025V) |
| + | | ±1uA max |
| + | | Reference voltage |
| + | | |
| + | |- |
| + | |} |
| + | | ANODE |
| + | | large |
| + | | set by external resistor |
| + | | Temperature sensing diode |
| + | | Diode drop varies w/ temperature. Requires external current limiting resistor. |
| | | |
− | === +3.3V supply ===
| |
− |
| |
− | Use for:
| |
− | *AD5535 DAC
| |
− | **ANODE
| |
− | ***Used for temperature monitoring. Voltage drop across a temperature sensitive diode allows AD7928 to measure internal temperature of AD5535. External resistor on AD5535 CATHODE will help to limit current draw.
| |
− | **REF_IN supply
| |
− | ***Using +3.3V for REF_IN limits the SiPM amplifier bias voltages to a maximum of 165V. If greater variability is needed (up to +200V max), a separate +4V supply can be used for REF_IN, perhaps taken from the +5V rail via a voltage divider.
| |
− | *AD7314 temperature sensor
| |
− | **VDD supply
| |
− | ***indicates ±1°C accuracy
| |
− | ***should make compatible with 3.3V CMOS logic
| |
− | *AD7928 ADC
| |
− | **VDRIVE output driver supply
| |
− | *CP2201 Ethernet
| |
− | **AV+ analog supply
| |
− | **VDD1 digital supply
| |
− | **VDD2 digital supply
| |
− | *FPGA
| |
− | **VCCAUX auxiliary supply
| |
− | ***Can also operate at +2.5V
| |
− | **VCCO I/O logic supply
| |
− | ***Makes it compatible with 3.3V CMOS logic
| |
− | ***Puts it within acceptable range of voltages for communication with other ICs
| |
− | *XCF01S EEPROM
| |
− | **VCCINT internal supply
| |
− | **VCCO output driver
| |
− | ***Matches 3.3V I/O on FPGA
| |
− | **VCCJ JTAG output driver
| |
− | ***''Are we using this?''
| |
− | *AD5535 DAC
| |
− | **V+ amplifier supply pins
| |
− | **AVCC analog supply pins
| |
− | **DVCC digital supply pins
| |
− | *AD7928 ADC
| |
− | **AVDD pins
| |
− | ***indicates measuring range of 0 to 2xREF_IN voltage
| |
− |
| |
− | === +1.2V supply ===
| |
− |
| |
− | Use for:
| |
− | *FPGA
| |
− | **VCCINT internal logic supply
| |
− |
| |
− | === +2.5V supply ===
| |
− |
| |
− | Use for:
| |
− | *AD7928 ADC
| |
− | **REF_IN reference supply
| |
− | ***Must be accurate to ±1%
| |
− |
| |
− |
| |
− |
| |
− | === +5V supply ===
| |
− | Use for:[[Image:AD5535 Power Supply Diagram.gif|thumb|Suggested AD5535 power supply connections taken from AD5535 data sheet.]]
| |
− | *AD5535 DAC
| |
− | **V+ amplifier supply pins
| |
− | **AVCC analog supply pins
| |
− | **DVCC digital supply pins
| |
− | *AD7928 ADC
| |
− | **AVDD pins
| |
− | ***indicates measuring range of 0 to 2xREF_IN voltage
| |
| | | |
| === -5V supply === | | === -5V supply === |