LTC1659 Datasheet, PDF (6/12 Pages) Linear Technology – 12-Bit Rail-to-Rail Micropower DAC in MSOP Package

LTC1659
PIN FUNCTIONS
CLK (Pin 1): Serial Interface Clock. Internal Schmitt trig-
ger on this input allows direct optocoupler interface.
D_IN (Pin 2): Serial Interface Data. Data on the D_IN pin is
latched into the shift register on the rising edge of the serial
clock.
CS/LD (Pin 3): Serial Interface Enable and Load Control.
When CS/LD is low the CLK signal is enabled, so the data
can be clocked in. When CS/LD is pulled high, data is
loaded from the shift register into the DAC register,
updating the DAC output and the CLK is disabled
internally.
D_OUT (Pin 4): Output of the Shift Register which Becomes
Valid on the Rising Edge of the Serial Clock.
GND (Pin 5): Ground.
REF (Pin 6): Reference Input. This pin can be tied to V_CC.
The output will swing from 0V to REF. The typical input
resistance is 28k.
V_OUT (Pin 7): Buffered DAC Output.
V_CC (Pin 8): Positive Supply Input. 2.7V ≤ V_CC ≤ 5.5V.
Requires a bypass capacitor to ground.
BLOCK DIAGRA
CLK 1
D_IN 2
CS/LD 3
12-BIT
SHIFT
REGISTER
LD
DAC
REGISTER
D_OUT 4
POWER-ON
RESET
12-BIT
DAC
8 V_CC
+
7 VOUT
–
6 REF
5 GND
1659 BD
6