Rainbow Electronics MAX1301 - Manual (Page 18)

MAX1300/MAX1301
Differential Common-Mode Range
The MAX1300/MAX1301 differential common-mode
range (V
CMDR
) must remain within -14V to +10V to obtain
valid conversion results. The differential common-mode
range is defined as:
In addition to the common-mode input voltage limitations,
each individual analog input must be limited to ±16.5V
with respect to AGND1.
The range-select bits R[2:0] in the analog input config-
uration bytes determine the full-scale range for the cor-
responding channel (Tables 2 and 6). Figures 9, 10,
and 11 show the valid analog input voltage ranges for
the MAX1300/MAX1301 when operating with FSR =
12V, FSR = 24V, and FSR = 48V, respectively. The
shaded area contains the valid common-mode voltage
ranges that support the entire FSR.
V
CH CH
CMDR
_ _
=
+
( )
+
( )
−
2
8-/4-Channel, ±12V Multirange Inputs,
Serial 16-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)
1 C2 C1 C0 0 0 0 0
Analog-Input Configuration Byte
(Table 2)
1 C2 C1 C0 DIF/SGL R2 R1 R0
Mode-Control Byte
(Table 7)
1 M2 M1 M0 1 0 0 0
Table 4. Channel Selection in Single-Ended Mode (DIF/ S SG GL L = 0)
CHANNEL-SELECT BIT CHANNEL
C2 C1 C0 CH0 CH1 CH2 CH3 CH4 CH5 CH6 CH7 AGND1
0 0 0 + -
0 0 1 + -
0 1 0 + -
0 1 1 + -
1 0 0 + -
1 0 1 + -
1 1 0 + -
1 1 1 + -
Table 5. Channel Selection in True-Differential Mode (DIF/ S SG GL L = 1)
CHANNEL-SELECT BIT CHANNEL
C2 C1 C0 CH0 CH1 CH2 CH3 CH4 CH5 CH6 CH7 AGND1
0 0 0 + -
0 0 1 RESERVED
0 1 0 + -
0 1 1 RESERVED
1 0 0 + -
1 0 1 RESERVED
1 1 0 + -
1 1 1 RESERVED