LTC1402
ELECTRICAL CHARACTERISTICS
Note 12:
The absolute voltage at A
IN+
and A
IN–
must be within this range.
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.
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.
Note 16:
The time period for acquiring the input signal is started by the
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
Sleep mode resets the REFREADY bit in the D
OUT
sequence. The
REFREADY bit goes high again 10ms after the V
REF
has stopped slewing in
wake up. This ensures valid REFREADY bit operation even with higher load
capacitances at V
REF
.
Note 18:
The full power bandwidth is the frequency where the output code
swing drops to 2828LSBs with a 4V
P-P
input sine wave.
(Bipolar Mode Plots Run with Dual
±5V
Supplies.
Unipolar Mode Plots Run with a Single 5V Supply. V
DD
= 5V, V
SS
= – 5V for Bipolar, V
DD
= 5V, V
SS
= 0V for Unipolar), T
A
= 25°C.
5 Harmonic THD, 2nd, 3rd and
SFDR vs Input Frequency
(Bipolar)
74
68
62
56
50
44
38
32
26
20
14
f
SAMPLE
= 2.22MHz
10
5
10
6
INPUT FREQUENCY (Hz)
8
2
10
7
1401 G01
TYPICAL PERFOR A CE CHARACTERISTICS
ENOBs and SINAD
vs Input Frequency (Bipolar)
12
11
10
9
8
7
6
5
4
3
2
1
0
10
4
0
–10
–20
EFFECTIVE NUMBER OF BITS
THD, SFDR, 2ND 3RD (dB)
–60
–70
–80
–90
–100
–110
–120
10
4
10
5
10
6
INPUT FREQUENCY (Hz)
10
7
1401 G02
SNR (dB)
ENOBs and SINAD
vs Input Frequency (Unipolar)
12
11
10
9
8
7
6
5
4
3
2
1
0
10
4
f
SAMPLE
= 2.22MHz
10
5
10
6
INPUT FREQUENCY (Hz)
74
68
62
56
50
44
38
32
26
20
14
8
2
10
7
1401 G04
EFFECTIVE NUMBER OF BITS
THD, SFDR, 2ND 3RD (dB)
SNR (dB)
U W
SNR vs Input Frequency (Bipolar)
–2
–8
–14
–20
–26
–32
–38
–44
–50
–56
–62
–68
–74
10
4
10
5
10
6
INPUT FREQUENCY (Hz)
10
7
1401 G03
–30
–40
–50
THD
SFDR
2ND
3RD
f
SAMPLE
= 2.22MHz
f
SAMPLE
= 2.22MHz
SIGNAL-TO-NOISE + DISTORTION (dB)
SIGNAL-TO-NOISE + DISTORTION (dB)
5 Harmonic THD, 2nd, 3rd and
SFDR vs Input Frequency
(Unipolar)
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
10
4
10
5
10
6
INPUT FREQUENCY (Hz)
10
7
1401 G05
SNR vs Input Frequency (Unipolar)
–2
–8
–14
–20
–26
–32
–38
–44
–50
–56
–62
–68
–74
10
4
10
5
10
6
INPUT FREQUENCY (Hz)
10
7
1401 G06
THD
SFDR
2ND
3RD
f
SAMPLE
= 2.22MHz
f
SAMPLE
= 2.22MHz
5
LINER [ LINEAR TECHNOLOGY ]
