MAX1304 Maxim, MAX1304 Datasheet - Page 28
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MAX1304
Manufacturer Part Number
MAX1304
Description
8-/4-/2-Channel / 12-Bit / Simultaneous-Sampling ADCs with 10V / 5V / and 0 to +5V Analog Input Ranges
Manufacturer
Maxim
Datasheet
1.MAX1304.pdf
(36 pages)
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Table 6. ±5V Bipolar Code Table
8-/4-/2-Channel, 12-Bit, Simultaneous-Sampling ADCs
with ±10V, ±5V, and 0 to +5V Analog Input Ranges
Table 6 and Figure 13 show the two’s complement trans-
fer function for the ±5V input range MAX1308/MAX1309/
MAX1310. The FSR is four times the voltage at REF. The
internal +2.5V reference gives a +10V FSR, while an
external +2V to +3V reference allows an FSR of +8V to
+12V respectively. Calculate the LSB size using:
which equals 2.44mV when using a 2.5V reference.
28
DIGITAL OUTPUT
0111 1111 1111 =
0111 1111 1110 =
0000 0000 0001 =
0000 0000 0000 =
1111 1111 1111 =
1000 0000 0001 =
1000 0000 0000 =
COMPLEMENT
______________________________________________________________________________________
TWO’s
CODE
0x7FF
0x7FE
0x001
0x000
0xFFF
0x801
0x800
1
LSB
DIGITAL OUTPUT
EQUIVALENT
DECIMAL
(CODE
=
CODE
+2047
+2046
-2047
-2048
+1
4
-1
0
x V
2
10
12
)
REF
Bipolar ±5V Devices
+4.9988 ± 0.5 LSB
+4.9963 ± 0.5 LSB
+0.0037 ± 0.5 LSB
+0.0012 ± 0.5 LSB
(
INPUT VOLTAGE
-0.0012 ± 0.5 LSB
-4.9963 ± 0.5 LSB
-4.9988 ± 0.5 LSB
V
REF
V
MSV
(V)
= +2.5V
= 0
)
The input range is centered about V
MSV = AGND, and the input is symmetrical about zero.
For a custom midscale voltage, drive MSV with an
external voltage source. Noise present on MSV directly
couples into the ADC result. Use a precision, low-drift
voltage reference with adequate bypassing to prevent
MSV from degrading ADC performance. For maximum
FSR, do not violate the absolute maximum voltage rat-
ings of the analog inputs when choosing MSV.
Determine the input voltage as a function of V
V
Figure 13. ±5V Bipolar Transfer Function
MSV
, and the output code in decimal using:
0x7FD
0x7FC
0x7FF
0x7FE
0x001
0x000
0xFFF
0x803
0x802
0x801
0x800
-2048 -2046
V
CH_
= LSB x CODE
INPUT VOLTAGE (V
-1 0 +1
4 x V
(MSV)
CH_
REF
10
- V
+ V
MSV
1 LSB =
IN LSBs)
MSV
MSV
+2045
. Normally,
4 x V
2
12
+2047
REF
REF
,