LTC1664
PIN FUNCTIONS
GND (Pin 1):
System Ground.
V
OUT A
to V
OUT D
(Pins 2–5):
DAC Analog Voltage Outputs.
The output range is
1023
0 to
V
1024
REF
REF (Pin 6):
Reference Voltage Input. 0V
≤
V
REF
≤
V
CC
.
CS/LD (Pin 7):
Serial Interface Chip Select/Load Input.
When CS/LD is low, SCK is enabled for shifting data on D
IN
into the register. When CS/LD is pulled high, SCK is
disabled and data is loaded from the shift register into the
specified DAC register(s), updating the analog output(s).
CMOS and TTL compatible.
SCK (Pin 8):
Serial Interface Clock Input. CMOS and TTL
compatible.
D
IN
(Pin 9):
Serial Interface Data Input. Data on the D
IN
pin
is shifted into the 16-bit register on the rising edge of SCK.
CMOS and TTL compatible.
D
OUT
(Pin 10):
Serial Interface Data Output. Data appears
on D
OUT
16 positive SCK edges after being applied to D
IN
.
May be tied to D
IN
of another serial device for daisy-chain
operaton. CMOS and TTL compatible.
CLR (Pin 11):
Asynchronous Clear Input. All internal shift
and DAC registers are cleared to zero at the falling edge of
the CLR signal, forcing the analog outputs to zero scale.
CMOS and TTL compatible.
NC (Pins 12–15):
Make no electrical connection to these
pins.
V
CC
(Pin 16):
Supply Voltage Input. 2.7V
≤
V
CC
≤
5.5V.
6
U
U
U
LINER [ LINEAR TECHNOLOGY ]
