1402I Просмотр технического описания (PDF) - Linear Technology
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1402I Datasheet PDF : 24 Pages
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LTC1402
ELECTRICAL CHARACTERISTICS
Note 12: The absolute voltage at AIN+ and AIN– 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 DOUT sequence. The
REFREADY bit goes high again 10ms after the VREF has stopped slewing in
wake up. This ensures valid REFREADY bit operation even with higher load
capacitances at VREF.
Note 18: The full power bandwidth is the frequency where the output code
swing drops to 2828LSBs with a 4VP-P input sine wave.
TYPICAL PERFOR A CE CHARACTERISTICS (Bipolar Mode Plots Run with Dual ±5V Supplies.
Unipolar Mode Plots Run with a Single 5V Supply. VDD = 5V, VSS = – 5V for Bipolar, VDD = 5V, VSS = 0V for Unipolar), TA = 25°C.
ENOBs and SINAD
vs Input Frequency (Bipolar)
12
74
11
68
10
62
9
56
8
50
7
44
6
38
5
32
4
26
3
20
2
14
1 fSAMPLE = 2.22MHz
8
0
2
104
105
106
107
INPUT FREQUENCY (Hz)
1401 G01
ENOBs and SINAD
vs Input Frequency (Unipolar)
12
74
11
68
10
62
9
56
8
50
7
44
6
38
5
32
4
26
3
20
2
14
1 fSAMPLE = 2.22MHz
8
0
2
104
105
106
107
INPUT FREQUENCY (Hz)
1401 G04
5 Harmonic THD, 2nd, 3rd and
SFDR vs Input Frequency
(Bipolar)
0
THD
–10
SFDR
–20
2ND
–30
3RD
–40 fSAMPLE = 2.22MHz
–50
–60
–70
–80
–90
–100
–110
–120
104
105
106
107
INPUT FREQUENCY (Hz)
1401 G02
SNR vs Input Frequency (Bipolar)
–2
–8 fSAMPLE = 2.22MHz
–14
–20
–26
–32
–38
–44
–50
–56
–62
–68
–74
104
105
106
107
INPUT FREQUENCY (Hz)
1401 G03
5 Harmonic THD, 2nd, 3rd and
SFDR vs Input Frequency
(Unipolar)
0
THD
–10
SFDR
–20
2ND
–30
3RD
–40 fSAMPLE = 2.22MHz
–50
–60
–70
–80
–90
–100
–110
–120
104
105
106
107
INPUT FREQUENCY (Hz)
1401 G05
SNR vs Input Frequency (Unipolar)
–2
–8 fSAMPLE = 2.22MHz
–14
–20
–26
–32
–38
–44
–50
–56
–62
–68
–74
104
105
106
107
INPUT FREQUENCY (Hz)
1401 G06
5
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