Texas Instruments LMP8480 and LMP8481 Evaluation Tool LMP8481MMEVM-S LMP8481MMEVM-S 데이터 시트
제품 코드
LMP8481MMEVM-S
Setup
6
LMP8480/81 User’s Guide
March 2013
3.5.
Reference Inputs (Bi-Directional Devices Only)
For Bi-Directional devices, the “zero” output level can be set by a voltage applied to the reference pins. The
reference voltages may be applied externally through the VREF pin, or sourced from the VCC line. These
jumpers will have no effect on devices without reference pins!!!
C6 and C7 are available if reference line bypassing or filtering is desired.
Figure 6: Reference Jumper Pins
Table 1 below shows the jumper positions and the input configuration.
Jumper Position
Reference
JP1
JP2
1-2
1-2
VREF
1-2
2-3
VREF / 2
2-3
1-2
(VS + VREF) / 2
2-3
2-3
VS / 2
Table 1: Reference Jumper Settings
3.6. Output - VOUT
Similar to the Rt resistors, Riso is available for output isolation when driving capacitive loads or for output
short circuit protection. If the output must drive large capacitive loads (like a coax cable), Riso may be
needed to prevent oscillations. The jumper trace between the pads must be cut to use Riso.
short circuit protection. If the output must drive large capacitive loads (like a coax cable), Riso may be
needed to prevent oscillations. The jumper trace between the pads must be cut to use Riso.
Figure 7: Optional Riso and Shorting Pad