4
LTC1415
(Note 5)
TI I G CHARACTERISTICS
W
U
The ● denotes specifications which apply over the full operating
temperature range; all other limits and typicals T
A
= 25°C.
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: All voltage values are with respect to ground with DGND and
AGND wired together unless otherwise noted.
Note 3: When these pin voltages are taken below ground or above V
DD
,
they will be clamped by internal diodes. This product can handle input
currents greater than 100mA below ground or above V
DD
without latchup.
Note 4: When these pin voltages are taken below ground, they will be
clamped by internal diodes. This product can handle input currents greater
than 100mA below ground without latchup. These pins are not clamped
to V
DD
.
Note 5: V
DD
= 5V, f
SAMPLE
= 1.25MHz, t
r
= t
f
= 5ns unless otherwise
specified.
Note 6: Linearity, offset and full-scale specifications apply for a single-
ended +A
IN
input with –A
IN
grounded.
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: Guaranteed by design, not subject to test.
Note 10: Recommended operating conditions.
Note 11: The falling edge of CONVST starts a conversion. If CONVST
returns high at a critical point during the conversion it can create small
errors. For best performance ensure that CONVST returns high either
within 425ns after the start of the conversion or after BUSY rises.
Note 12: CS = RD = CONVST = 0V.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
f
SAMPLE(MAX)
Maximum Sampling Frequency ● 1.25 MHz
Conversion and Acquisition Time
● 800 ns
t
CONV
Conversion Time ● 700 ns
t
ACQ
Acquisition Time ● 150 ns
t
1
CS to RD Setup Time (Notes 9, 10) ● 0ns
t
2
CS↓ to CONVST↓ Setup Time (Notes 9, 10) ● 10 ns
t
3
NAP/SLP↑ to SHDN↓ Setup Time (Notes 9, 10) 200 ns
t
4
SHDN↑ to CONVST↓ Wake-Up Time Nap Mode (Note 10) 200 ns
Sleep Mode, C
REFCOMP
= 10µF (Note 10) 10 ms
t
5
CONVST Low Time (Notes 10, 11) ● 50 ns
t
6
CONVST to BUSY Delay C
L
= 25pF 10 ns
● 60 ns
t
7
Data Ready Before BUSY↑ 20 35 ns
● 15 ns
t
8
Delay Between Conversions (Note 10) ● 50 ns
t
9
Wait Time RD↓ After BUSY↑ (Note 10) ● –5 ns
t
10
Data Access Time After RD↓ C
L
= 25pF 20 35 ns
● 45 ns
C
L
= 100pF 25 45 ns
● 60 ns
t
11
Bus Relinquish Time 10 30 ns
0°C = T
A
= 70°C ● 35 ns
–40°C = T
A
= 85°C ● 40 ns
t
12
RD Low Time ● t
10
ns
t
13
CONVST High Time ● 50 ns
t
14
Aperture Delay of Sample-and-Hold –1.5 ns
