Figure 6. simplified analog input circuit, Figure 4. internal clock-mode conversion (mode 2), Figure 5. analog input current vs. input voltage – Rainbow Electronics MAX1301 User Manual
Page 17
Figure 6. Simplified Analog Input Circuit
MAX1300
MAX1301
R2
R1
V
SJ
*R
SOURCE
ANALOG
SIGNAL
SOURCE
R2
R1
V
SJ
*R
SOURCE
ANALOG
SIGNAL
SOURCE
IN_+
IN_+
*MINIMIZE R
SOURCE
TO AVOID GAIN ERROR AND DISTORTION.
MAX1300/MAX1301
8-/4-Channel, ±12V Multirange Inputs,
Serial 16-Bit ADCs
______________________________________________________________________________________
17
CS
SCLK
1
2
3
4
5
6
7
8
17
18
19
20
21
22
23
24
DIN
S
C2
C1
C0
0
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
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
HIGH IMPEDANCE
Figure 4. Internal Clock-Mode Conversion (Mode 2)
ANALOG INPUT VOLTAGE (V)
ANALOG INPUT CURRENT (mA)
9
6
3
0
-3
-6
-9
-0.6
-0.2
0.2
0.6
1.0
-1.0
-12
12
ALL MODES
Figure 5. Analog Input Current vs. Input Voltage