1.1. Introduction
Outputs
1 PPS
5V HCMOS, >2V high, < 0.8V low into 50 Ω , Rising Edge On Time, 60 μS Pos-
itive pulse
Periodic
5V HCMOS, >2V high, < 0.8V low into 50 Ω , Rising Edge On Time (selectable
on time control), <1 Hz to 250 kHz, square wave
DDS
5V HCMOS, >2V high, < 0.8V low into 50 Ω , Rising Edge On Time (selectable
on time control), 1/1e7 - 1e8 Hz, <2 nS jitter p-p, square wave
Strobe
5V HCMOS, >2V high, < 0.8V low into 50 Ω , 1 μS Positive pulse, variable delay
1, 5, 10 MHz clock
5V HCMOS, >2V high, < 0.8V low into 50 Ω (see "1.3. Functional Description"
on page 16 for signal characteristics)
Time Code DCLS 5V HCMOS, >2V high, < 0.8V low into 50 Ω
External 10 MHz
Oscillator DAC
Jumper selectable 0-5VDC or 0-10VDC into 1kΩ
bc635PCI-V2 and bc637PCI-V2 Jumpers
The following is a list of the hardware jumpers on the bc635PCI-V2 and bc637PCI-V2 boards:
n
JP1 is a 2mm jumper that is the RTC battery connect switch. The RTC battery is a non-recharge-
able lithium cell with 48 mAh capacity. When the card is not powered and the RTC battery has not
been disabled, the RTC draws about 20 uA which will provide >100 days of RTC operation. Long-
term storage of the card should be done only after issuing the Disconnect RTC Battery command
or by the manual disconnection of the jumper on JP1. The factory configuration places the 2mm
J1 jumper ON.
n
JP2 is the 1, 5, 10 MPPS or 10 MHz oscillator select switch. The factory configuration places the
2mm JP2 jumper on pins 1-2 which will allow for the software selection of 1, 5 or 10 MPPS for the
output on J1 pin 13. When the jumper is in the 2-3 position, the output on J1 pin 13 is a buffered
signal from the 10 MHz oscillator.
n
JP3 is the DAC voltage range switch. When the jumper is OFF, the DAC voltage is 0-5 VDC;
when ON the voltage is 0-10 VDC. Both oscillators that are offered for this board have 0-5 VDC
control voltage ranges, therefore the 2mm jumper is not factory installed. If an external oscillator
requires a 0-10 VDC control voltage range, a 2mm jumper should be placed on JP3.
n
JP4 is for factory use only.
bc635PCIe and bc637PCIe Jumpers
The following is a list of the hardware jumpers on the bc635PCIe and bc637PCIe boards:
n
JP1 is a 2mm jumper that is the RTC battery connect switch. The RTC battery is a non-recharge-
able lithium cell with 48 mAh capacity. When the card is not powered and the RTC battery has not
been disabled, the RTC draws about 20 uA which will provide >100 days of RTC operation. Long-
term storage of the card should be done only after issuing the Disconnect RTC Battery command
or by the manual disconnection of the jumper on JP1. The factory configuration places the 2mm
J1 jumper ON.
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