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MX7705 Datasheet(PDF) 19 Page - Maxim Integrated Products

Part # MX7705
Description  16-Bit, Low-Power, 2-Channel, Sigma-Delta ADC
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MX7705 Datasheet(HTML) 19 Page - Maxim Integrated Products

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Increasing the gain increases the resolution of the ADC
(LSB size decreases), but reduces the differential input
voltage range. Calculate 1 LSB in unipolar mode using
the following equation:
where VREF = VREF+ - VREF-.
For a gain of one and VREF = 2.5V, the full-scale volt-
age in unipolar mode is 2.5V and 1 LSB
≈ 38.1µV. For a
gain of four, the full-scale voltage in unipolar mode is
0.625V (VREF / GAIN) and 1 LSB
≈ 9.5µV. The differen-
tial input voltage range in this example reduces from
2.5V to 0.625V, and the resolution increases, since the
LSB size decreased from 38.1µV to 9.5µV.
Calculate 1 LSB in bipolar mode using the following
equation:
where VREF = VREF+ - VREF-.
Unipolar and Bipolar Modes
The B/U bit in the setup register (Table 9) configures
the MX7705 for unipolar or bipolar transfer functions.
Figures 4 and 5 illustrate the unipolar and bipolar trans-
fer functions, respectively.
In unipolar mode, the digital output code is straight
binary. When AIN+ = AIN-, the outputs are at zero
scale, which is the lower endpoint of the transfer func-
tion. The full-scale endpoint is given by AIN+ - AIN- =
VREF / GAIN, where VREF = VREF+ - VREF-.
In bipolar mode, the digital output code is in offset
binary. Positive full scale is given by AIN+ - AIN- =
+VREF / GAIN and negative full scale is given by AIN+ -
AIN- = -VREF / GAIN. When AIN+ = AIN-, the outputs
are at zero scale, which is the midpoint of the bipolar
transfer function.
When the MX7705 is in buffered mode, the absolute and
common-mode analog input voltage ranges reduce to
between (GND + 50mV) and (VDD - 1.5V). The differential
input voltage range is not affected in buffered mode.
1
65 536
2
(,
)
LSB
V
GAIN
REF
1
65 536
(,
)
LSB
V
GAIN
REF
=
16-Bit, Low-Power, 2-Channel,
Sigma-Delta ADC
______________________________________________________________________________________
19
Table 5. Input Sampling Capacitor vs. Gain
GAIN
INPUT SAMPLING CAPACITOR (CSAMP) (pF)
1
3.75
2
7.5
415
8–128
30
01
2
3
0000 0000 0000 0000
0000 0000 0000 0001
0000 0000 0000 0010
0000 0000 0000 0011
FULL-SCALE TRANSITION
1 LSB =
VREF
(GAIN) (65,536)
65,535
65,533
DIFFERENTIAL INPUT VOLTAGE (LSB)
1111 1111 1111 1101
1111 1111 1111 1110
1111 1111 1111 1111
1111 1111 1111 1100
VREF / GAIN
Figure 4. MX7705 Unipolar Transfer Function
1 LSB =
VREF
(GAIN) (65,536)
0+1
-1
0000 0000 0000 0000
0000 0000 0000 0001
0000 0000 0000 0010
+32,767
+32,765
1111 1111 1111 1101
1111 1111 1111 1110
1111 1111 1111 1111
1000 0000 0000 0000
1000 0000 0000 0001
0111 1111 1111 1111
x 2
-32,768
-32,766
DIFFERENTIAL INPUT VOLTAGE (LSB)
VREF / GAIN
VREF / GAIN
Figure 5. MX7705 Bipolar Transfer Function


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