MAX5152 Maxim, MAX5152 Datasheet - Page 16

• Manufacturer Part Number: MAX5152
• Description: Low-Power / Dual / 13-Bit Voltage-Output DACs with Configurable Outputs
• Manufacturer: Maxim

Figure 15 depicts a digitally programmable, unidirec-
tional current source that can be used in industrial con-
trol applications. The output current is:
where NB is the DAC code and R is the sense resistor.
On power-up, the input and DAC registers clear (reset
to zero code). For rated performance, V
at least 1.4V below V
a 4.7µF capacitor in parallel with a 0.1µF capacitor to
GND. Minimize lead lengths to reduce lead inductance.
Digital and AC transient signals on AGND can create
noise at the output. Connect AGND to the highest quali-
ty ground available. Use proper grounding techniques,
such as a multilayer board with an unbroken, low-
inductance ground plane. Carefully lay out the traces
between channels to reduce AC cross-coupling and
crosstalk. Wire-wrapped boards and sockets are not
recommended. If noise becomes an issue, shielding
may be required.
Low-Power, Dual, 13-Bit Voltage-Output DACs
with Configurable Outputs
16
______________________________________________________________________________________
Grounding and Layout Considerations
Digital Programmable Current Source
I
OUT
= (V
Power-Supply Considerations
DD
REF
. Bypass the power supply with
/ R) (NB / 8192)
REF_
should be
Figure 15. Digitally Programmable Current Source
DGND
REF_
MAX5152
MAX5153
DAC_
AGND
+5V/+3V
V
DD
OUT_
FB_
V
L
2N3904
R
I
OUT