/4-channel, ±v, Multirange inputs, serial 14-bit adcs – Rainbow Electronics MAX1035 User Manual
Page 16
MAX1034/MAX1035
Figure 8 illustrates the software-selectable differential
analog input voltage range that produces a valid digital
output. Each analog input differential pair can be inde-
pendently programmed to one of three differential input
ranges by setting the R[2:0] control bits with DIF/SGL = 1.
Regardless of the specified input voltage range and
whether the channel is selected, each analog input is
±6V fault tolerant. The analog input fault protection is
active whether the device is unpowered or powered.
Any voltage beyond FSR, but within the ±6V fault-
tolerant range, applied to an analog input results in a
full-scale output voltage for that channel.
Clamping diodes with breakdown thresholds in excess
of 6V protect the MAX1034/MAX1035 analog inputs
during ESD and other transient events (Figure 6). The
clamping diodes do not conduct during normal device
operation, nor do they limit the current during such
transients. When operating in an environment with the
potential for high-energy voltage and/or current tran-
sients, protect the MAX1034/MAX1035 externally.
8-/4-Channel, ±V
REF
Multirange Inputs,
Serial 14-Bit ADCs
16
______________________________________________________________________________________
CS
SCLK
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
DIN
S
C2
C1
C0
0
0
0
0
ANALOG INPUT
TRACK AND HOLD*
HOLD
DOUT
B13
B12
B11
B10
B9
B8
B7
B6
B5
B4
B3
B2
B1
B0
X
X
BYTE 1
BYTE 2
BYTE 3
BYTE 4
SSTRB
INTCLK**
1
2
3
14
15
16
17
TRACK
HOLD
t
ACQ
100ns to 400ns
f
INTCLK
≈ 4.5MHz
f
SAMPLE
≈ f
SCLK
/ 32 + f
INTCLK
/ 17
*TRACK AND HOLD TIMING IS CONTROLLED BY SCLK.
**INTCLK IS AN INTERNAL SIGNAL AND IS NOT ACCESSIBLE TO THE USER.
SAMPLING INSTANT
HIGH
IMPEDANCE
Figure 3. External Acquisition-Mode Conversion (Mode 1)