Datasheet

3
LMP7312 Evaluation Board User Guide
(551600360-001 REV A)
Table 1 Register Values
LSB MSB
HI_Z NULL_SW EN_CL Gain_0 Gain_1 Gain Value (V/V)
Mode of
Operation
0 0 0 0 0 0.096 Attenuation
0 0 0 1 0 0.192 Attenuation
0 0 0 0 1 0.384 Attenuation
0 0 0 1 1 0.768 Attenuation
0 0 1 0 1 1 Amplification
0 0 1 1 1 2 Amplification
1 x x x x -
High
Impedance
output
0 1 x x x 1
Null Switch
mode
Table 2 S2 Dip switch description
PINS NAME
1-2 Hiz
3-4 Null_SW
5-6 EN_CL
7-8 Gain_0
9-10 Gain_1
WRITING TO THE REGISTER USING A
MICROCONTROLLER
A microcontroller can be used to program the
LMP7312. If the microcontroller is provided with a
TTL logic signal connect pin1 and pin2 of J6
together, otherwise, apply a voltage compliant
with the microcontroller logic value to the VIO
banana plug, and short pin2 and pin3 of J6. The
microcontroller signals are connected to the
LMP7312 through J7. More information on the
SPI configuration is provided in the SPI section of
the LMP7312 datasheet.
Table 3 J7 connector description
PIN NAME PIN NAME
1 CSB 8 NC
2 GND 9 NC
3 SCK 10 NC
4 NC 11 NC
5 SDI 12 NC
6 NC 13 NC
7 SDO 14 NC
Interfacing ADC Eval Board
The LMP7312 Eval Board can be interfaced with
the ADC141S626 and ADC161S626 Eval Boards
through the P1 connector only when the
LMP7312 is configured in the differential output
mode (see Output Configuration section).
Table 4 P1 connector description
PIN
1 2 3 4 5
NAME
Vs GND OUT- GND OUT+