
LTC2704
18
2704fd
Voltage Output/Feedback and Compensation
TheLTC2704providesseparatevoltageoutputandfeedback
pins for each DAC. This allows compensation for resistance
between the output and load, or a current boosting stage
such as an LT1970 may be inserted without affecting ac-
curacy. When OUTx is connected directly to RFBx and no
GND1 TRACE,
SEPARATED FROM
AGND UNDER LTC2704
EXPOSED GROUND PLANE AROUND EDGE
ALLOWS GROUNDING TO PROTOTYPE CIRCUITS
2704 F03
GND2 TRACE,
SEPARATED FROM
AGND UNDER LTC2704
CUTOUT PREVENTS DIGITAL RETURN CURRENTS
FROM COUPLING INTO ANALOG GROUND PLANE. NOTE
THAT THERE IS A PLANE IN THIS REGION ON LAYER 3
2704 F04
Figure 3. DC752 Top Layer
Figure 4. DC752 Analog Ground Layer. No Currents Are Returned
to this Plane, so it May Be Used As a Reference Point for Precise
Voltage Measurements
additional capacitance is present, the internal frequency
compensation is sufcient for stability and is optimized
for fast settling time. If a low bandwidth booster stage is
used, then a compensation capacitor from OUTx to C1x
may be required. Similarly, extra compensation may be
required to drive a heavy capacitive load.
APPLICATIONS INFORMATION