4
LTC1414
TI I G CHARACTERISTICS
W
U
(Note 5)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
f
SAMPLE(MAX)
Maximum Sampling Frequency ● 2.2 MHz
t
CONV
Conversion Time ● 220 330 400 ns
t
ACQ
Acquisition Time ● 40 100 ns
t
THROUGHPUT
Throughput Time (Acquisition + Conversion) ● 370 454 ns
t
1
CONVST to BUSY Delay C
L
= 25pF 10 ns
t
2
Data Ready Before BUSY↑ ±20 ns
t
3
Delay Between Conversions (Note 9) ● 100 ns
t
4
CONVST Low Time (Note 10) ● 40 ns
t
5
CONVST High Time (Note 10) ● 40 ns
t
6
Aperture Delay of Sample-and-Hold –1 ns
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 V
SS
or above V
DD
, they
will be clamped by internal diodes. This product can handle input currents
greater than 100mA below V
SS
or above V
DD
without latchup.
Note 4: When these pin voltages are taken below V
SS
, they will be clamped
by internal diodes. This product can handle input currents greater than
100mA below V
SS
without latchup. These pins are not clamped to V
DD
.
Note 5: V
DD
= 5V, V
SS
= –5V, f
SAMPLE
= 2.2MHz and 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 00 and
1111 1111 1111 11.
Note 9: Recommended operating conditions.
Note 10: The falling CONVST edge starts a conversion. If CONVST returns
high at a critical point during the conversion it can create small errors. For
best results ensure that CONVST returns high either within 225ns after the
start of the conversion or after BUSY rises.
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Signal-to-Noise Ratio vs Input
Frequency
INPUT FREQUENCY (Hz)
10k
SIGNAL-TO-NOISE RATIO (dB)
90
80
70
60
50
40
30
20
10
0
100k 1M 10M
1414 G02
INPUT FREQUENCY (Hz)
10k
DISTORTION (dB)
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
100k 1M 10M
1414 G03
2nd
THD
3rd
INPUT FREQUENCY (Hz)
EFFECTIVE BITS
S/(N + D) (dB)
10k 100k 1M 10M
1414 TA02
1k
14
13
12
11
10
9
8
7
6
5
4
3
2
86
80
74
68
f
SAMPLE
= 2.2MHz
S/(N + D) vs Input Frequency Distortion vs Input Frequency
