LTC1665/LTC1660
4
166560fa
TIMING CHARACTERISTICS
The l denotes specifications which apply over the full operating temperature
range, otherwise specifications are at T
A
= 25°C. (See Figure 1)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
CC
= 4.5V to 5.5V
t
1
D
IN
Valid to SCK Setup
l
40 ns
t
2
D
IN
Valid to SCK Hold
l
0ns
t
3
SCK High Time (Note 6)
l
30 ns
t
4
SCK Low Time (Note 6)
l
30 ns
t
5
CS/LD Pulse Width (Note 6)
l
80 ns
t
6
LSB SCK High to CS/LD High (Note 6)
l
30 ns
t
7
CS/LD Low to SCK High (Note 6)
l
80 ns
t
8
D
OUT
Propagation Delay C
LOAD
= 15pF (Note 6)
l
580ns
t
9
SCK Low to CS/LD Low (Note 6)
l
20 ns
t
10
CLR Pulse Width (Note 6)
l
100 ns
t
11
CS/LD High to SCK Positive Edge (Note 6)
l
30 ns
SCK Frequency Continuous Square Wave (Note 6)
Continuous 23% Duty Cycle Pulse (Note 6)
Gated Square Wave (Note 6)
l
l
l
5.00
7.69
16.7
MHz
MHz
MHz
V
CC
= 2.7V to 5.5V
t
1
D
IN
Valid to SCK Setup (Note 6)
l
60 ns
t
2
D
IN
Valid to SCK Hold (Note 6)
l
0ns
t
3
SCK High Time (Note 6)
l
50 ns
t
4
SCK Low Time (Note 6)
l
50 ns
t
5
CS/LD Pulse Width (Note 6)
l
100 ns
t
6
LSB SCK High to CS/LD High (Note 6)
l
50 ns
t
7
CS/LD Low to SCK High (Note 6)
l
100 ns
t
8
D
OUT
Propagation Delay C
LOAD
= 15pF (Note 6)
l
5 150 ns
t
9
SCK Low to CS/LD Low (Note 6)
l
30 ns
t
10
CLR Pulse Width (Note 6)
l
120 ns
t
11
CS/LD High to SCK Positive Edge (Note 6)
l
30 ns
SCK Frequency Continuous Square Wave (Note 6)
Continuous 28% Duty Cycle Pulse
Gated Square Wave
l
l
l
3.85
5.55
10
MHz
MHz
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: Nonlinearity and monotonicity are defined from code 4 to code
255 for the LTC1665 and from code 20 to code 1023 for the LTC1660.
See Applications Information.
Note 3: Digital inputs at 0V or V
CC
.
Note 4: Load is 10kΩ in parallel with 100pF.
Note 5: V
CC
= V
REF
= 5V. DAC switched between 0.1V
FS
and 0.9V
FS
,
i.e., codes 26 and 230 for the LTC1665 or codes 102 and 922 for the
LTC1660.
Note 6: Guaranteed by design and not production tested.
Note 7: Measured at code 4 for the LTC1665 and code 20 for the
LTC1660.
