+5V, Serial-Input, Voltage-Output, 14-Bit DACs
MAX544/MAX545
Pin Descriptions (continued)
MAX545
PIN
1
2
3
4
5
6
7
8
9
10
11
12
13
14
NAME
RFB
OUT
AGNDF
AGNDS
REFS
REFF
CS
SCLK
N.C.
DIN
LDAC
DGND
INV
V
DD
FUNCTION
Feedback Resistor. Connect to external op amp’s output in bipolar mode.
DAC Output Voltage
Analog Ground (force)
Analog Ground (sense)
Voltage Reference Input (sense). Connect REFS to external +2.5V reference.
Voltage Reference Input (force). Connect REFF to external +2.5V reference.
Chip-Select Input
Serial-Clock Input. Duty cycle must be between 40% and 60%.
No Connection. Not internally connected.
Serial-Data Input
LDAC
Input. A falling edge updates the internal DAC latch.
Digital Ground
Junction of internal scaling resistors. Connect to external op amp’s inverting input in
bipolar mode.
+5V Supply Voltage
;;;;;;;;
;;;;;;;;;
t
CSH1
t
LDACS
CS
t
CSHO
t
CSSO
t
CH
t
CL
t
CSS1
SCLK
t
DH
t
DS
DIN
D13
D12
S0
LDAC*
t
LDAC
*MAX545 ONLY
Figure 1. Timing Diagram
6
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MAXIM [ MAXIM INTEGRATED PRODUCTS ]
