Multirange inputs, serial 14-bit adcs, Figure 6. simplified analog input circuit, Figure 4. internal clock-mode conversion (mode 2) – Rainbow Electronics MAX1035 User Manual
Page 17: Figure 5. analog input current vs. input voltage
Figure 6. Simplified Analog Input Circuit
MAX1034
MAX1035
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.
MAX1034/MAX1035
8-/4-Channel, ±V
REF
Multirange Inputs,
Serial 14-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
B13
B12
B11
B10
B9
B8
B7
B6
B5
B4
B3
B2
B1
B0
X
X
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)
4
2
0
-2
-4
-0.5
-1.0
0
0.5
1.0
1.5
-1.5
-6
6
Figure 5. Analog Input Current vs. Input Voltage