LTC1402
ELECTRICAL CHARACTERISTICS
+
–
Note 12: The absolute voltage at A and A must be within this range.
Note 16: The time period for acquiring the input signal is started by the
IN
IN
14th rising clock and it is ended by the rising edge of convert.
Note 17: The internal reference settles in 2ms after it wakes up from Sleep
mode with one or more cycles at SCK and a 10µF capacitive load. The
Note 13: If less than 7.3ns is allowed, the output data will appear one
clock cycle later. It is best for CONV to rise half a clock before SCK, when
running the clock at rated speed.
Sleep mode resets the REFREADY bit in the D
REFREADY bit goes high again 10ms after the V has stopped slewing in
wake up. This ensures valid REFREADY bit operation even with higher load
sequence. The
REF
Note 14: Not the same as aperture delay. Aperture delay is smaller (2.6ns)
because the 0.8ns delay through the sample-and-hold is subtracted from
the CONV to Hold mode delay.
Note 15: The rising edge of SCK is guaranteed to catch the data coming
out into a storage latch.
OUT
capacitances at V
.
REF
Note 18: The full power bandwidth is the frequency where the output code
swing drops to 2828LSBs with a 4V input sine wave.
P-P
U W
(Bipolar Mode Plots Run with Dual ±5V Supplies.
TYPICAL PERFOR A CE CHARACTERISTICS
Unipolar Mode Plots Run with a Single 5V Supply. VDD = 5V, VSS = –5V for Bipolar, VDD = 5V, VSS = 0V for Unipolar), TA = 25°C.
5 Harmonic THD, 2nd, 3rd and
SFDR vs Input Frequency
(Bipolar)
ENOBs and SINAD
vs Input Frequency (Bipolar)
SNR vs Input Frequency (Bipolar)
12
11
10
9
74
68
62
56
50
44
38
32
26
20
14
8
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
–2
–8
THD
SFDR
2ND
3RD
f
= 2.22MHz
SAMPLE
–14
–20
–26
–32
–38
–44
–50
–56
–62
–68
–74
f
= 2.22MHz
SAMPLE
8
7
6
5
4
3
2
1
f
= 2.22MHz
SAMPLE
0
10
2
4
5
6
7
4
5
6
7
4
5
6
7
10
10
10
10
10
10
10
10
10
10
10
INPUT FREQUENCY (Hz)
INPUT FREQUENCY (Hz)
INPUT FREQUENCY (Hz)
1401 G01
1401 G02
1401 G03
5 Harmonic THD, 2nd, 3rd and
SFDR vs Input Frequency
(Unipolar)
ENOBs and SINAD
vs Input Frequency (Unipolar)
SNR vs Input Frequency (Unipolar)
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
–2
–8
12
11
10
9
74
68
62
56
50
44
38
32
26
20
14
8
THD
SFDR
2ND
3RD
f
= 2.22MHz
SAMPLE
–14
–20
–26
–32
–38
–44
–50
–56
–62
–68
–74
f
= 2.22MHz
SAMPLE
8
7
6
5
4
3
2
1
f
= 2.22MHz
SAMPLE
0
2
4
5
6
7
4
5
6
7
4
5
6
7
10
10
10
10
10
10
10
10
10
10
10
10
INPUT FREQUENCY (Hz)
INPUT FREQUENCY (Hz)
INPUT FREQUENCY (Hz)
1401 G05
1401 G06
1401 G04
5
Linear [ Linear ]
