User guide

MAX544/MAX545
+5V, Serial-Input, Voltage-Output, 14-Bit DACs
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Pin Descriptions (continued)
t
CSHO
t
CH
t
CSSO
t
CL
t
DH
t
DS
t
CSH1
t
CSS1
t
LDACS
t
LDAC
CS
SCLK
DIN
LDAC*
*MAX545 ONLY
D13 D12
S0
Figure 1. Timing Diagram
+5V Supply Voltage
V
DD
Digital GroundDGND12
LDAC Input. A falling edge updates the internal DAC latch.LDAC
11
Serial-Data InputDIN10
No Connection. Not internally connected.N.C.9
Serial-Clock Input. Duty cycle must be between 40% and 60%.SCLK8
Chip-Select Input
CS
7
Voltage Reference Input (force). Connect REFF to external +2.5V reference.REFF6
Voltage Reference Input (sense). Connect REFS to external +2.5V reference.REFS5
Analog Ground (sense)AGNDS4
Analog Ground (force)AGNDF3
DAC Output VoltageOUT2
Feedback Resistor. Connect to external op amp’s output in bipolar mode.RFB1
FUNCTIONNAMEPIN
Junction of internal scaling resistors. Connect to external op amp’s inverting input in
bipolar mode.
INV13
14
MAX545