Datasheet

MAX1034/MAX1035
Differential Common-Mode Range
The MAX1034/MAX1035 differential common-mode
range (V
CMDR
) must remain within -4.75V to +5.5V to
obtain valid conversion results. The differential com-
mon-mode range is defined as:
In addition to the common-mode input voltage limita-
tions, each individual analog input must be limited to
±6V with respect to AGND1.
The range-select bits R[2:0] in the analog input configu-
ration bytes determine the full-scale range for the corre-
sponding channel (Tables 2 and 6). Figures 9, 10, and
11 show the valid analog input voltage ranges for
the MAX1034/MAX1035 when operating with FSR =
V
REF
/ 2, FSR = V
REF
, and FSR = 2 x V
REF
, respectively.
The shaded area contains the valid common-mode
voltage ranges that support the entire FSR.
V
CH CH
CMDR
_ _
=
+
()
+
()
−
2
8-/4-Channel, ±V
REF
Multirange Inputs,
Serial 14-Bit ADCs
18 ______________________________________________________________________________________
Table 3. Input Data Word Formats
DATA BIT
OPERATION
D7
(START)
D6 D5 D4 D3 D2 D1 D0
Conversion-Start Byte
(Tables 4 and 5)
1C2C1C00000
Analog-Input Configuration Byte
(Table 2)
1 C2 C1 C0 DIF/SGL R2 R1 R0
Mode-Control Byte
(Table 7)
1M2M1M01000
Table 4. Channel Selection in Single-Ended Mode (DIF/SGL = 0)
CHANNEL-SELECT BIT CHANNEL
C2 C1 C0 CH0 CH1 CH2 CH3 CH4 CH5 CH6 CH7 AGND1
000+ -
001 + -
010 + -
011 + -
100 + -
101 + -
110 +-
111 +-
Table 5. Channel Selection in True-Differential Mode (DIF/SGL = 1)
CHANNEL-SELECT BIT CHANNEL
C2 C1 C0 CH0 CH1 CH2 CH3 CH4 CH5 CH6 CH7 AGND1
000+-
0 0 1 RESERVED
010 +-
0 1 1 RESERVED
100 +-
1 0 1 RESERVED
110 +-
1 1 1 RESERVED