Texas Instruments DAC7716EVM manual Default Jumper Settings and Switch Positions

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6.3Default Jumper Settings and Switch Positions

Figure 2 shows the jumpers found on the EVM and the respective factory default conditions for each.

Figure 2. DAC7716EVM Default Jumper Locations

Jumper JP1 controls whether the LDAC signal is controlled by J2.15 or J2.17. By default, the LDAC signal is controlled by J2.17 but can be changed using JP1.

Jumpers JP2, JP3, JP4, and JP5 are used to control the gain of the individual DAC channels. By default, the jumpers are removed, resulting in each DAC channel having a gain of 4. The gain of the output channel is 2 when the corresponding jumper is in place.

JP6 and JP7 control the signals applied to REFGND-A and REFGND-B on the DAC7716. By default, a jumper is placed across JP6.2 and JP6.3 as well as JP7.2 and JP7.3. This jumper connects REFGND-A and REFGND-B to the ground of the board when an onboard reference is used. When an external reference source is used, it is recommended that this jumper stay in place and configure the external reference source to share a common ground with the EVM. See the Reference Voltage section for more information.

Jumper JP8 is used to control the digital voltage for IOVDD. By default, a jumper is in place to short-circuit pins JP8.1 and JP8.2 to use a 3.3V digital supply. If pins JP8.3 and JP8.4 are connected, a 1.8V digital supply will be used. If pins JP8.5 and JP8.6 are connected, a 5V digital supply will be used for IOVDD.

Jumper JP9 is not installed. If the user desires to disconnect RFB1 from VOUT1, the trace between JP9 must be cut. JP9 can then be installed.

SBAU159 –October 2009	DAC7716EVM 7
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