4
LTC1404
1404fa
DIGITAL I PUTS AND OUTPUTS
UU
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
OZ
Hi-Z Output Leakage D
OUT
V
OUT
= 0V to V
CC
● ±10 µA
C
OZ
Hi-Z Output Capacitance D
OUT
15 pF
I
SOURCE
Output Source Current V
OUT
= 0V – 10 mA
I
SINK
Output Sink Current V
OUT
= V
CC
10 mA
TI I G CHARACTERISTICS
W
U
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 voltage values are with respect to GND.
Note 3: When these pin voltages are taken below V
SS
(ground for unipolar
mode) or above V
CC
, they will be clamped by internal diodes. This product
can handle input currents greater than 60mA without latch-up if the pin is
driven below V
SS
(ground for unipolar mode) or above V
CC
.
Note 4: When these pin voltages are taken below V
SS
(ground for unipolar
mode), they will be clamped by internal diodes. This product can handle
input currents greater than 60mA without latch-up if the pin is driven
below V
SS
(ground for unipolar mode). These pins are not clamped to V
CC
.
Note 5: Guaranteed by design, not subject to test.
Note 6: Linearity, offset and full-scale specifications apply for unipolar and
bipolar modes.
Note 7: Integral nonlinearity is defined as the deviation of a code from a
straight line passing through the actual endpoints of the transfer curve.
The deviation is measured from the center of the quantization band.
Note 8: Bipolar offset is the offset voltage measured from –0.5LSB when
the output code flickers between 0000 0000 0000 and 1111 1111 1111.
Note 9: The rising edge of CONV starts a conversion. If CONV returns low
at a bit decision point during the conversion, it can create small errors. For
best performance, ensure that CONV returns low either within 100ns after
the conversion starts (i.e., before the first bit decision) or after the 14
clock cycles. (Figure 13 Timing Diagram).
Note 10: If this timing specification is not met, the device may not respond
to a request for a conversion. To recover from this condition a NAP
request is required.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
f
SAMPLE(MAX)
Maximum Sampling Frequency ● 600 kHz
t
CONV
Conversion Time f
CLK
= 9.6MHz 1.36 µs
t
ACQ
Acquisition Time (Unipolar Mode) 200 ns
(Bipolar Mode V
SS
= – 5V) 160 ns
f
CLK
CLK Frequency ● 0.1 9.6 MHz
t
CLK
CLK Pulse Width (Notes 5 and 10) ● 40 ns
t
WK(NAP)
Time to Wake Up from Nap Mode 350 ns
t
1
CLK Pulse Width to Return to Active Mode ● 40 ns
t
2
CONV↑ to CLK↑ Setup Time ● 70 ns
t
3
CONV↑ After Leading CLK↑ ● 0ns
t
4
CONV Pulse Width (Note 9) ● 40 ns
t
5
Time from CLK↑ to Sample Mode 60 ns
t
6
Aperture Delay of Sample-and-Hold Jitter < 50ps 40 ns
t
7
Minimum Delay Between Conversion (Unipolar Mode) (Note 5) ● 220 310 ns
(Bipolar Mode V
SS
= – 5V) ● 180 300 ns
t
8
Delay Time, CLK↑ to D
OUT
Valid C
LOAD
= 20pF ● 40 70 ns
t
9
Delay Time, CLK↑ to D
OUT
Hi-Z C
LOAD
= 20pF ● 40 70 ns
t
10
Time from Previous Data Remains Valid After CLK↑ C
LOAD
= 20pF ● 10 30 ns
t
11
Minimum Time Between Nap/Sleep Request to Wake Up Request (Notes 5 and 10) ● 50 ns
The ● denotes specifications which apply over the full operating temperature
range, unless otherwise noted specifications are at T
A
= 25°C. V
CC
= 5V, f
SAMPLE
= 600kHz, t
r
= t
f
= 5ns, unless otherwise specified.
The
● denotes specifications which apply over the full operating temperature range,
unless otherwise noted specifications are at T
A
= 25°C. V
CC
= 5V, f
SAMPLE
= 600kHz, t
r
= t
f
= 5ns, unless otherwise specified. See Figures
12, 13, 14.
