Texas Instruments DAC7741EVM manual 5. Jumper Setting Function, Reference, EVM Operation

Jumper Setting

3.3 Jumper Setting

The figures in Table 3-5 will show the function of each jumper on the EVM.

Table 3-5. Jumper Setting Function

Reference	Jumper			Function
		Setting
	1		3	ROFFSET is strapped to VREF to set VSJ (summing junction) to VREF/2. Refer to the data
				sheet for offset adjustment.
W1	1		3	ROFFSET is not connected to set VSJ (summing junction) to VREF/3. Refer to the data
				sheet for offset adjustment.
	1		3	ROFFSET is strapped to AGND to set VSJ (summing junction) to VREF/6. Refer to the
				data sheet for osset adjustment.
	1		3	Disables the internal reference voltage.
W2
	1		3	Enables the internal reference voltage of +10V.
	1		3	REFIN is strapped to REFOUT to allow the internal 10 V to supply the DAC reference
W3				voltage.
	1		3	REFIN is strapped to exREFin to allow either the onboard adjustable reference or user
				supplied reference to supply the DAC reference voltage.
	1		3	Routes the onboard 10 V reference through the adjustable pot to W3 and W14.
W4
	1		3	Routes the user supplied reference from TP1 or J4-20 through the adjustable pot to
				W3 and W14.
	1		3	Negative supply rail of op-amp is powered by -15 V.
W5
	1		3	Negative supply rail of op-amp is tied to AGND.
W6				REFADJ pin is not connected.
				REFADJ pin is connected to R1 pot for gain adjustment input when internal reference
				is used.
				RFB2 pin is not connected to the VOUT pin.

W7

W8

RFB2 pin is strapped to the VOUT pin for feedback.

TEST pin not connected to DGND.

TEST pin connected to DGND (default mode).

SJ (summing junction) pin of the DAC output amplifier is not connected.

W9	SJ (summing junction) pin of the DAC output amplifier is connected to R2 pot to allow
	small amount of current for offset adjustment.
W10	RFB1 pin is not connected.

RFB1 pin is strapped to RFB2 pin for DAC VOUT feedback.

EVM Operation 3-5