Datasheet

LTC1257
4
1257fc
TYPICAL PERFORMANCE CHARACTERISTICS
Supply Current
vs Logic Input Voltage Output Swing vs Load Resistance
Pull-Down Voltage
vs Output Sink Current Capability
Minimum Supply Voltage
vs Load Current #1
Minimum Supply Voltage
vs Load Current #2 Supply Current vs Temperature
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= T
MIN
to T
MAX
. V
CC
= 4.75V to 15.75V, internal or external reference
(2.475V ≤ V
REF
≤ V
CC
– 2.7V), unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
t
5
LOAD Pulse Width
l
150 ns
t
6
LSB CLK to LOAD
l
0 ns
t
7
LOAD High to CLK
l
0 ns
t
8
D
OUT
Output Delay C
LOAD
= 15pF
l
35 150 ns
f
CLK
Maximum Clock Frequency 1.4 MHz
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
Guaranteed by design; not subject to test.
Note 3: DAC switched from all 1s to all 0s, and all 0s to all 1s code.
Note 4: Guaranteed with internal V
REF
or with external V
REF
range of
2.475V to 12V. Tested at 10V.
OUTPUT LOAD CURRENT (mA)
0.01
MINIMUM SUPPLY VOLTAGE (V)
0.1 1 10
1257 G01
5.0
4.8
4.6
4.4
4.2
4.0
3.8
3.6
3.4
3.2
3.0
V
REF
= INTERNAL
V
OUT
= FULL SCALE
T
A
= 25°C
OUTPUT LOAD CURRENT (mA)
0.01
MINIMUM SUPPLY VOLTAGE (V)
0.1 1 10
1257 G02
15.0
14.5
14.0
13.5
13.0
12.5
12.0
11.5
11.0
V
REF
= 10V
V
OUT
= FULL SCALE
T
A
= 25°C
TEMPERATURE (°C)
–50
0.38
0.37
0.36
0.35
0.34
0.33
0.32
0.31
25 75
1257 G03
–25 0
50 100 125
SUPPLY CURRENT (mA)
V
CC
= 5.25V
V
CC
= 5V
V
CC
= 4.75V
LOGIC VOLTAGE (V)
0
SUPPLY CURRENT (mA)
0.59
0.54
0.49
0.44
0.39
0.34
4
1257 G04
1
2
3
5
V
CC
= 5V
T
A
= 25°C
LOAD RESISTANCE (Ω)
10
OUTPUT VOLTAGE SWING (V)
100 1k 10k
1257 G05
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
FULL SCALE
R
L
TIED TO GND
ZERO SCALE
R
L
TIED TO V
CC
V
CC
= 5V
OUTPUT SINK CURRENT (µA)
1
OUTPUT PULL-DOWN VOLTAGE (mV)
1000
100
10
1
0.1
10 100 1000
1257 G06
HOT
COLD
ROOM