Jumper Settings; Input/Output Connectors - Texas Instruments DAC5668 Manual

DAC5668/88/89 Hardware Description
• No VCXO installed. CDCM7005 in buffer mode which requires an input single-ended clock signal to
SMA connector J20.
• The DAC outputs are set by default to drive the TRF3703.
• The converter is set to operate with internal reference. Jumper J5 EXTLO is installed between pins 1
and 2.
• Full-scale output current set to 20 mA through RBIAS resistor R91.
4.1

Jumper Settings

The DAC5668/88/89EVM has onboard jumpers that allow the user to modify the board configuration.
Table 2 explains the functionality of the jumpers.
JUMPER LABEL
SW1 BRD_RESET
JP1 REF_CLK
J1 VCXO_EN
JP2 VCXOB
JP3 VCXO
JP4 CLK1/CLKOUT
JP5 CLK1C/LOCK
JP6 VFUSE
J5 EXTLO
CDC_PD
RESET
CLKOUT_EN
SYNC
TX_ENABLE
4.2

Input/Output Connectors

Table 3 lists the input and output connectors on the DAC5668/88/89EVM.
REFERENCE
DESIGNATOR
J2
J3
J4
J6
J7
J8
J9
J10/J11
J12 USB_CONN
J13/J14
J15/J16
J17 OUTCLK2 Y3A
J18 OUTCLK2 Y4A
6
DAC5668/88/89EVM
Table 2. Jumper List
FUNCTION
Resets the DAC and CDCM7005 devices
Chooses internal 10-MHz ref or external ref
VCXO power down
Chooses internal VCXO or external source
Chooses internal VCXO or external source
Selects between CLK1 input to DAC or CLKOUT DAC
output
Selects between CLK1C input to DAC or LOCK
indicator DAC output
Factory use only. Connect to 1.8VDD for normal
operation.
Internal (GND) or external (3.3V) voltage reference
Active-low power down of CDCM7005
DAC RESET Signal
Active-low enable of CLKOUT signal buffer
DAC SYNC Signal
DAC TX_ENABLE Signal
Table 3. Input and Output Connections
LABEL CONNECTOR
TYPE
34-pin Header
IOUTB1 SMA
IOUTB2 SMA
RFOUT SMA
34-pin Header
IOUTA1 SMA
IOUTA2 SMA
+5V Banana Plug
USB
+1.8V Banana Plug
3.3V Banana Plug
SMA
SMA
Copyright © 2008–2010, Texas Instruments Incorporated
DESCRIPTION
A-bus input data to the DAC.
Optional IOUTB1 output.
DACB transformer output. Optional IOUTB2 output.
RF output from TRF3703.
B-bus input data to the DAC.
Optional IOUTA1 output.
DACA transformer output. Optional IOUTA2 output.
+5-V connection pair. Required only for RF measurements.
USB connector for software communication.
+1.8-V connection pair.
+3.3-V connection pair.
Optional CDCM7005 clock output.
Optional CDCM7005 clock output.
SLAU241A – June 2008 – Revised March 2010
www.ti.com
DEFAULT SETTING
CONDITION
Internal Ref Pin 2-3
Disabled Unpopulated
External source Pin 2-3
External source Pin 2-3
CLKOUT Pin 2-3
LOCK Pin 2-3
1.8 VDD Pin 1-2
Internal Reference Pin 1-2
Active CDCM7005 Pin 2-3
Unpopulated
Enabled Buffer Pin 1-2
GND Pin 1-2
3.3V Pin 2-3
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