Si57x-EVB
Rev. 0.2
3
1. Functional Description
The Si57x-EVB is the evaluation board assembly for the Si57x/598/599 any frequency I
2
C programmable XO/
VCO. This evaluation board assembly provides access to all signals for programming and operating the device.
The Si57x-EVB assembly motherboard and daughterboard schematics, bills of material, and PCB layouts are
appended as sections 5, 6 and 7, respectively. Reference designators below refer to the Si57x-EVB motherboard
unless otherwise noted. The Si57x-EVB is oriented with the daughterboard at the bottom in the directions below.
1.1. Motherboard-Daughterboard Connection
The Si57x-EVB motherboard connects to the Si57x daughterboard at connectors J13-J14. Each of these is a 2x20
pin, impedance controlled connector. The connectors are keyed so there is only one proper way to install the
board. Orient the boards on installation so that the silkscreen triangle on the daughterboard matches the silkscreen
on the motherboard.
1.2. Power Supply
The Si57x-EVB is pre-configured to accept 5 V from the USB connector at J15. To change the board's 5 V power
supply from the USB connection to the terminal block at J18, make these changes:
Remove R7.
Populate R8.
Note:
If both R7 and R8 are installed, do not simultaneously connect to both the USB connector at J15 and to a separate 5 V
supply at J18. Otherwise, power supply contention may occur.
Typical supply current draw for the Si57x-EVB assembly (mothe daughterboard) is approximately 230 mA.
See the device data sheet for device power consumption specifications.
The evaluation daughter board are designed to operate at any of the following nominal voltages: 1.8, 2.5, or 3.3 V.
The Si57x-EVB has an on-board voltage regulator which supplies any of these voltages. The Si57x-EVB voltage
regulator is controlled via jumpers. By default, a jumper is installed, selecting 3.3 V for the Si57x/598/599.
Alternatively, VREG may be set to 1.8 or 2.5 V per Table 1.
Table 1. VREG Jumpers
Voltage
Selection
J6 Jumper Installation
(Assuming S/W Control Unavailable)
3.3
Connect pin 1 “3.3 V” to center pin 2
2.5
Connect pin 3 “2.5 V” to center pin 2
1.8
No jumper
Summary of Contents for Si57-EVB Series
Page 5: ...Si57x EVB Rev 0 2 5 Figure 2 Si57x EVB Motherboard LED Locations...
Page 21: ...Si57x EVB Rev 0 2 21 Figure 13 Si57x EVB MB Primary Side...
Page 22: ...Si57x EVB 22 Rev 0 2 Figure 14 Si57x EVB MB GND Plane 1...
Page 23: ...Si57x EVB Rev 0 2 23 Figure 15 Si57x EVB MB 57x_VDD Plane...
Page 24: ...Si57x EVB 24 Rev 0 2 Figure 16 Si57x EVB MB 5 3 3 V Plane...
Page 25: ...Si57x EVB Rev 0 2 25 Figure 17 Si57x EVB MB GND Plane 2...
Page 26: ...Si57x EVB 26 Rev 0 2 Figure 18 Si57x EVB MB Secondary Side...
Page 27: ...Si57x EVB Rev 0 2 27 Figure 19 Si57x EVB MB Silkscreen Side B...
Page 28: ...Si57x EVB 28 Rev 0 2 7 2 Si57x EVB Daughterboard Figure 20 Si57x EVB DB Silkscreen Side A...
Page 29: ...Si57x EVB Rev 0 2 29 Figure 21 Si57x EVB DB Primary Side...
Page 30: ...Si57x EVB 30 Rev 0 2 Figure 22 Si57x EVB DB GND Plane...
Page 31: ...Si57x EVB Rev 0 2 31 Figure 23 Si57x EVB DB 57x_VDD Plane...
Page 32: ...Si57x EVB 32 Rev 0 2 Figure 24 Si57x EVB DB Secondary Side...
Page 33: ...Si57x EVB Rev 0 2 33 Figure 25 Si57x EVB DB Silkscreen Side B...
