ltc1659cs8-trpbf Linear Technology Corporation, ltc1659cs8-trpbf Datasheet - Page 6

• Manufacturer Part Number: ltc1659cs8-trpbf
• Description: Ltc1659 - 12-bit Rail-to-rail Micropower Dac In Msop Package
• Manufacturer: Linear Technology Corporation

PIN FUNCTIONS
CLK (Pin 1): Serial Interface Clock. Internal Schmitt trigger
on this input allows direct optocoupler interface.
D
latched into the shift register on the rising edge of the
serial clock.
⎯ C ⎯ S /LD (Pin 3): Serial Interface Enable and Load Control.
When ⎯ C ⎯ S /LD is low the CLK signal is enabled, so the data
can be clocked in. When ⎯ C ⎯ S /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.
LTC1659
BLOCK DIAGRAM
6
IN
(Pin 2): Serial Interface Data. Data on the D
CS/LD
D
CLK 1
OUT
D
IN
2
3
4
REGISTER
12-BIT
SHIFT
POWER-ON
RESET
REGISTER
IN
DAC
LD
pin is
D
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
The output will swing from 0V to REF. The typical input
resistance is 28k.
V
V
Requires a bypass capacitor to ground.
OUT
CC
OUT
12-BIT
(Pin 8): Positive Supply Input. 2.7V ≤ V
DAC
(Pin 4): Output of the Shift Register which Becomes
(Pin 7): Buffered DAC Output.
–
+
1659 BD
6
5
8
7
V
V
REF
GND
CC
OUT
CC
≤ 5.5V.
1659fa
CC
.