LTC2641/LTC2642
PIN FUNCTIONS
LTC2641
REF (Pin 1):
Reference Voltage Input. Apply an external
reference at REF between 2V and V
DD
.
⎯
CS (Pin 2):
Serial Interface Chip Select/Load Input. When
⎯
⎯
C
⎯
S is low, SCLK is enabled for shifting in data on DIN.
When
⎯
C
⎯
S is taken high, SCLK is disabled, the 16-bit input
word is latched and the DAC is updated.
SCLK (Pin 3):
Serial Interface Clock Input. CMOS and
TTL compatible.
DIN (Pin 4):
Serial Interface Data Input. Data is applied
to DIN for transfer to the device at the rising edge of
SCLK.
⎯
CL
⎯
R (Pin 5):
Asynchronous Clear Input. A logic low clears
⎯
the DAC to code 0.
V
OUT
(Pin 6):
DAC Output Voltage. The output range is
0V to V
REF
.
V
DD
(Pin 7):
Supply Voltage. Set between 2.7V and
5.5V.
GND (Pin 8):
Circuit Ground.
Exposed Pad (DFN Pin 9):
Circuit Ground. Must be sol-
dered to PCB ground.
LTC2642
REF (Pin 1):
Reference Voltage Input. Apply an external
reference at REF between 2V and V
DD
.
⎯
CS (Pin 2):
Serial Interface Chip Select/Load Input. When
⎯
⎯
C
⎯
S is low, SCLK is enabled for shifting in data on DIN.
When
⎯
C
⎯
S is taken high, SCLK is disabled, the 16-bit input
word is latched and the DAC is updated
SCLK (Pin 3):
Serial Interface Clock Input. CMOS and
TTL compatible.
DIN (Pin 4):
Serial Interface Data Input. Data is applied
to DIN for transfer to the device at the rising edge of
SCLK.
⎯
CL
⎯
R (Pin 5):
Asynchronous Clear Input. A logic low clears
⎯
the DAC to midscale.
V
OUT
(Pin 6):
DAC Output Voltage. The output range is
0V to V
REF
.
INV (Pin 7):
Center Tap of Internal Scaling Resistors.
Connect to an external amplifier’s inverting input in bipolar
mode.
R
FB
(Pin 8):
Feedback Resistor. Connect to an external
amplifier’s output in bipolar mode. The bipolar output
range is –V
REF
to V
REF
.
V
DD
(Pin 9):
Supply Voltage. Set between 2.7V and
5.5V.
GND (Pin 10):
Circuit Ground.
Exposed Pad (DFN Pin 11):
Circuit Ground. Must be
soldered to PCB ground.
26412f
9
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