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LMP7312MA Datasheet(PDF) 16 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # LMP7312MA
Description  Precision SPI-Programmable AFE with Differential/Single-Ended Input/Output
PDF  22 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LMP7312MA Datasheet(HTML) 16 Page - National Semiconductor (TI)

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Gain_0, Gain_1 bit: Gain Values
Different gains are available in Attenuation Mode or Amplifi-
cation Mode according to the following Gain Table.
Gain_1
Gain_0
EN_CL
Gain Value (V/V)
0
0
0
0.096
0
1
0
0.192
1
0
0
0.384
1
1
0
0.768
1
0
1
1
1
1
1
2
EN_CL bit: Enable Amplification Mode
This register selects which input pair is processed.
EN_CL
Mode
Description
0
Attenuation
Mode
±V
IN
inputs are processed
through the 104.16k input
resistors
1
Amplification
Mode
±IN inputs are processed
through
the
40k
input
resistors
NULL_SW bit: Input Offset Nulling Switch Mode
This register selects a mode in which the amplifier is not pro-
cessing any input but it is configured in unity gain to allow
system level amplifier offset calibration. The Nulling Switch
mode is available in both single ended and fully differential
output mode. The LMP7312 in Nulling Switch and fully differ-
ential mode has he following configuration.
NULL_SW
Mode
Description
0
Normal
Operation
Mode
±V
IN
and ±IN inputs are
processed
depending
on
EN_CL register setting.
1
Nulling Switch
Mode
Enables to evaluate the offset
of the internal amplifier for
system level calibration
30075507
FIGURE 4. LMP7312 in Nulling Switch Mode
In this condition at the Output pins is possible to measure the
input voltage offset of the op-amp:
Output Mode
+V
OUT
−V
OUT/VR
Differential
V
CM_out+VOS/2
V
CM_out -VOS/2
Single-Ended
V
R+VOS
V
R
Hi_Z bit: High Impedance
In this mode both outputs +V
OUT
and -V
OUT/VR of
the
LMP7312 are in tri-state Figure 5.
HI_Z
Mode
Description
0
Normal
Operation Mode
The LMP7312 is configured
according to value of the
other 4 bits of the register.
1
High Impedance
Mode
The LMP7312 output is in
high impedance
30075560
FIGURE 5. LMP7312 in High Impedance Mode
www.national.com
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