LTC2654
8
2654f
ELECTRICAL CHARACTERISTICS
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
CC
= 4.5V to 5.5V, V
OUT
unloaded unless otherwise specifi ed.
TIMING CHARACTERISTICS
The l denotes the specifi cations which apply over the full operating temperature
range, otherwise specifi cations are at T
A
= 25°C.
LTC2654B-L16/LTC2654-L12/LTC2654B-H16/LTC2654-H12
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
CC
= 2.7V to 5.5V
t
1
SDI Valid to SCK Setup
l
4ns
t
2
SDI Valid to SCK Hold
l
4ns
t
3
SCK High Time
l
9ns
t
4
SCK Low Time
l
9ns
t
5
CS/LD Pulse Width
l
10 ns
t
6
LSB SCK High to CS/LD High
l
7ns
t
7
CS/LD Low to SCK High
l
7ns
t
8
SDO Propagation Delay from SCK Falling Edge C
LOAD
= 10pF
V
CC
= 4.5V to 5.5V
V
CC
= 2.7V to 4.5V
l
l
20
45
ns
ns
t
9
CLR Pulse Width
l
20 ns
t
10
CS/LD High to SCK Positive Edge
l
7ns
t
12
LDAC Pulse Width
l
15 ns
t
13
CS/LD High to LDAC High or Low Transition
l
200 ns
SCK Frequency 50% Duty Cycle
l
50 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: All voltages with respect to GND.
Note 3: Linearity and monotonicity are defi ned from code k
L
to code 2
N
–1,
where N is the resolution and k
L
is the lower end code for which no output
limiting occurs. For V
REF
= 2.5V and N = 16, k
L
= 128 and linearity is
defi ned from code 128 to code 65535. For V
REF
= 2.5V and N = 12, k
L
= 8
and linearity is defi ned from code 8 to code 4,095.
Note 4: Inferred from measurement at code 128 (LTC2654-16), or code 8
(LTC2654-12).
Note 5: DC Crosstalk is measured with V
CC
= 5V and using internal
reference, with the measured DAC at mid-scale.
Note 6: This IC includes current limiting that is intended to protect the
device during momentary overload conditions. Junction temperature can
exceed the rated maximum during current limiting. Continuous operation
above the specifi ed maximum operating junction temperature may impair
device reliability.
Note 7: Temperature coeffi cient is calculated by dividing the maximum
change in output voltage by the specifi ed temperature range. Maximum
temperature coeffi cient is guaranteed for C-grade only.
Note 8: Digital inputs at 0V or V
CC
.
Note 9: Guaranteed by design and not production tested.
Note 10: Internal Reference mode. DAC is stepped ¼ scale to ¾ scale and
¾ scale to ¼ scale. Load is 2k in parallel with 200pF to GND.
Note 11: V
CC
= 5V, Internal Reference mode. DAC is stepped ±1 LSB
between half-scale and half-scale - 1. Load is 2k in parallel with 200pF
to GND.
Note 12: DAC to DAC Crosstalk is the glitch that appears at the output
of one DAC due to a full-scale change at the output of another DAC. It is
measured with V
CC
= 5V and using internal reference, with the measured
DAC at mid-scale. C
REFIN/OUT
= No Load.
Note 13: Gain error specifi cation may be degraded for reference input
voltages less than 1V. See Gain Error vs Reference Input Voltage curve in
the Typical Performance Characteristics section.
LTC2654B-H16/ LTC2654-H12 (Internal Reference = 2.048V)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
e
n
Output Voltage Noise Density At f = 1kHz
At f = 10kHz
85
80
nV/√Hz
nV/√Hz
Output Voltage Noise 0.1Hz to 10Hz, Internal Reference
0.1Hz to 200kHz, Internal Reference
12
450
µV
P-P
µV
P-P
