Texas Instruments DAC8555EVM manual Reference

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EVM Operation

Table 7. Jumper Settings and Functions (continued)

Reference Jumper Setting (1)

JMP4

JMP5

JMP6

1 3

JMP7

1 3

1 3

JMP8

1 3

1 3

JMP9

1 3

1 3

JMP10

1 3

1 3

JMP11

1 3

Function

RST pin is set high through pull-up resistor R4. RST can be driven by GPIO5, J2-19.

RST pin is set low.

Disconnects VREFH to the inverting input of the op amp U2.

Connects VREFH to the inverting input of the op amp U2.

Disconnects the inverting input of the op amp U2 from the gain resistor, R9.

Connects the inverting input of the op amp U2 from the gain resistor, R9 for output gain of 2.

+5V analog supply is selected for AVDD.

+3.3V analog supply is selected for AVDD.

Routes the adjustable, buffered, onboard +5V reference to the VREFH input of the DAC8555.

Routes the user-supplied reference from TP2 or J4-20 to the VREFH input of the DAC8555.

VREFL is tied to AGND.

Routes the user-supplied negative reference from TP3 or J4-18 to the VREFL input of the DAC8555. This voltage should be within the range of 0V to VREFH.

Negative supply rail of the op amp U2 is powered by VSS for bipolar operation.

Negative supply rail of the op amp U2 is tied to AGND for unipolar operation.

Routes VOUTA to J4-2.

Routes VOUTA to J4-10.

20	DAC8555EVM User's Guide	SLAU204 –December 2006
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