Datasheet

LTC1661
6
1661fa
PIN FUNCTIONS
CS/LD (Pin 1): 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 the operation(s) specified in the control code,
A3-A0, is (are) performed. CMOS and TTL compatible.
SCK (Pin 2): Serial Interface Clock Input. CMOS and TTL
compatible.
D
IN
(Pin 3): Serial Interface Data Input. Input word data on
the D
IN
pin is shifted into the 16-bit register on the rising
edge of SCK. CMOS and TTL compatible.
REF (Pin 4): Reference Voltage Input. 0V ≤ V
REF
≤ V
CC
.
V
OUT A
, V
OUT B
(Pin 8, Pin 5): DAC Analog Voltage Outputs.
The output range is
0 V
OUTA,
V
OUTB
V
REF
1023
1024
V
CC
(Pin 6): Supply Voltage Input. 2.7V ≤ V
CC
≤ 5.5V.
GND (Pin 7): System Ground.
TYPICAL PERFORMANCE CHARACTERISTICS
Supply Current
vs Logic Input Voltage Supply Current vs Temperature
LOGIC INPUT VOLTAGE (V)
0 1 2 3 4 5
SUPPLY CURRENT (mA)
1661 G10
1.0
0.8
0.6
0.4
0.2
0
ALL DIGITAL INPUTS
SHORTED TOGETHER
TEMPERATURE (°C)
–55 –35 –15 5 25 45 65 85 105 125
SUPPLY CURRENT (µA)
1661 G11
150
140
130
120
110
100
90
80
70
60
50
V
CC
= 5.5V
V
REF
= V
CC
CODE = 1023
V
CC
= 4.5V
V
CC
= 3.6V
V
CC
= 2.7V