Datasheet

2 Circuit Description
2.1 Schematic Diagram
2.2 Circuit Function
LVDS LVDS
GND
5V
VSS-
VSS+
ADC
JP14JP13
JP15
JP10
JP11
JP12
JP9
J1
J2 J3
1
1
1
1
1
1
CLKIN
IN+
J7
J11
J9
J12
JP18
1
JP8
1
J15
J14
J18
1
JP16
1
JP19
1
JP7
1
IN-
J10
J19
J20
J21
J6
J8
CDC
OUT
VCXO
OUT
SW1
SW3
SW2
J5
JP17
J17
USB
www.ti.com Circuit Description
The schematic diagram for this EVM is attached at the end of this document. See the schematic or
relevant section of this user's guide before changing any jumpers.
Selection of various modes of operation of the ADS61x9/55xx is most often controlled by jumpers on the
EVM, either by placing shunts on 0.025-inch square jumper posts or by installation of surface mount 0- Ω
resistors. In general, the use of 0- Ω resistors as jumpers are used in the clock or signal path where signal
integrity is critical and jumper posts are used for static or low-speed control paths. Figure 1 shows the
relative location of the jumpers, connectors, and switches used on the ADS61x9/55xx. Figure 2 shows the
relative locations of most of the resistors and surface-mount 0- Ω jumper locations used on the EVM. In the
description of the circuit options in the following sections, each operational mode is accompanied by a
table entry that details the jumper or resistor changes that enable that option. Figure 1 and Figure 2 can
assist the user to quickly identify where these jumpers are located on the EVM.
Figure 1. ADS61x9/55xx Jumpers
SLWU061A – December 2008 – Revised June 2009 ADS61x9/55xxEVM 7
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