DS3105DK Maxim Integrated Products, DS3105DK Datasheet - Page 5

• Manufacturer Part Number: DS3105DK
• Description: Power Management Modules & Development Tools Demo Kit for DS3105 Demo Kit for DS3105
• Manufacturer: Maxim Integrated Products

Specifications of DS3105DK

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

1.1
There are six SMB connectors at the left of the board labeled IC3, IC4, IC9, and SYNC1–SYNC3 that provide a
single-ended
DS3105 with a 50Ω characteristic impedance trace and terminated with 50Ω at the device (SYNC1–SYNC3 require
a jumper in the TERM position to terminate due to dual functionality). Four additional SMB connectors labeled
IC5P, IC5N, IC6P, and IC6N provide differential clock inputs to the DS3105. These differential inputs have 50Ω
trace impedance, test points, and 50Ω termination at the device (i.e., 100Ω differential).
On the other side of the PCB are three SMB clock output connectors labeled OC3, FSYNC, and MFSYNC. All
single-ended clock outputs are buffered at the DS3105 and connected to the SMB connector via a 50Ω
characteristic impedance trace. Cables attached to the single-ended output connectors must have 50Ω termination
for proper operation. Two additional SMB connectors labeled OC6P and OC6N provide connections to the
differential outputs from the DS3105.
1.2
Jumpers JMP9–JMP12 and JMP16 (lower right of board) provide the means to pull up or pull down the SRFAIL,
SRCSW, SONSDH, and TEST pins of the DS3105. (Note that some of these jumpers only make sense for other
DS310x products where the pin has a different function.) Labels specify which position is used to pull each pin to a
1 or a 0 (if jumper is not installed, pin is left to float to accommodate a pin’s output function). Jumpers JMP1–JMP4
(middle right of board) provide access to the SYNC1–SYNC3 and IC9 pins of the DS3105. Labels specify the
position to install the jumper to pull the pin up (signified by “1”) or pull it down through a 50Ω resistor (signified by
“TERM\0”). The 50Ω resistor is used as a termination resistor when the pin is used as a input clock signal. Jumper
JMP6 (labeled VDDIOB) is not used when the board is configured as a DS3105DK. Jumpers JMP62 and JMP63
select the computer interface to be USB or RS232. Jumper JMP5 (upper left) selects whether the board should be
powered from the USB connector or from the power-supply jacks (J3 or J13/J19). LEDs DS1–DS4 (upper left)
indicate the labeled power supply is operational. LED DS16 (upper right) indicates that the microprocessor is
operational. LEDs DS5, DS6, and DS10 (lower middle) indicate the status of the SRFAIL, LOCK, and INTREQ
pins, respectively. Switch SW1 is used to select a squaring circuit to accommodate a sinusoidal input on IC3.
Header J51 provides access to the JTAG port of the DS3105. Test points are provided for differential inputs and
outputs, the watchdog timer pin, SPI port pins, and ground plane connection.
1.3
The DS87C520 microcontroller has factory-installed firmware in on-chip nonvolatile memory. This firmware
translates memory access requests from the RS232 serial port or USB port into register accesses on the DS3105.
When the microcontroller starts up it turns on DS16 to indicate that the controller is working correctly. A pushbutton
switch labeled RESET near the RS232 connector resets the microcontroller as well as the DS3105.
1.4
A 5V lab power supply can be connected across the red (J13) and black (J19) banana jacks. Optionally, the board
can be powered from the USB connector by placing jumper JMP5 in the USB position. The 5V input from either of
these sources is then regulated to 3.3V, 2.5V, and 1.8V, and distributed to board components.
Note that the board cannot be USB powered through some USB hubs. Before trying to power the board through a
USB hub, check the voltage at JMP5 to ensure the board is getting 5V from the hub.
Rev: 012808
_________________________________________________________________________________________DS3105DK
Input and Output Clocks
Jumpers, Headers, and Switch Settings
Microcontroller
Power-Supply Connectors
clock
input
to
the
DS3105.
All
single-ended
clock
inputs
are
connected
to
5 of 34
the