Datasheet
Figure 5. Simplified Analog Input Circuit
MAX1303
R2
R1
V
SJ
*R
SOURCE
ANALOG
SIGNAL
SOURCE
R2
R1
V
SJ
*R
SOURCE
ANALOG
SIGNAL
SOURCE
IN_+
IN_+
MAX1303
4-Channel, ±V
REF
Multirange Inputs,
Serial 16-Bit ADC
16 ______________________________________________________________________________________
CS
SCLK
1
2
3
4
5
6
7
8
17
18
19
20
21
22
23
24
DIN
SC2C1C00 0 0 0
ANALOG INPUT
TRACK AND HOLD*
TRACK
DOUT
B15 B14 B13 B12 B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0
BYTE 1 BYTE 2 BYTE 3
SSTRB
INTCLK**
1
2
3
25
26
27
28
9
10
11
12
13
14
15
16
10
11
12
13
14
HOLD HOLD
HIGH IMPEDANCE
t
ACQ
100ns to 400ns
f
INTCLK
≈ 4.5MHz
f
SAMPLE
≈ f
SCLK
/24 + f
INTCLK
/28
*TRACK AND HOLD TIMING IS CONTROLLED BY INTCLK, AND IS NOT ACCESSIBLE TO THE USER.
**INTCLK IS AN INTERNAL SIGNAL AND IS NOT ACCESSIBLE TO THE USER.
SAMPLING INSTANT
Figure 3. Internal Clock-Mode Conversion (Mode 2)
-1.5
-0.5
-1.0
0.5
0
1.0
1.5
ANALOG INPUT VOLTAGE (V)
ANALOG INPUT CURRENT (mA)
-6 -2 0-4 2 4 6
Figure 4. Analog Input Current vs. Input Voltage