Avago Technologies ACPL-7900-000E User Manual
ACPL-790B, ACPL-790A, ACPL-7900
Isolation Ampli er Evaluation Board User Manual
User Guide
Quick-Start Guide
Once visual inspection is done to ensure that the Evaluation Board is received in good condition, the Evaluation Board
can be powered up in just 3 simple steps according to Figure 1 as shown:
1. Select either one of the provided sensing resistors (10mΩ or 15mΩ), or user’s own sensing resistor and mount it
(through soldering) on pads provided for R1 on the Evaluation Board;
2. Connect the necessary power supplies and current source as shown:
a. Connect 1st isolated 5V DC supply (DC Supply 1) to connector CON1 as shown;
b. Connect a 3.3V DC supply (DC Supply 2, can be non-isolated) to connector CON2 as shown;
c. Connect, through soldering, the required input current source (for sensing) cables as shown;
3. Supply the input current (subject to a maximum signal level of 250mVpp, or ±125mVdc across resistor R1) through
the cables (as shown in 2c) and monitor the output through an oscilloscope.
2c. Connect
current source
cables
2a. Connect
DC supply 1.
+5V Gnd1
2b. Connect
DC supply 2.
+3.3V Gnd1
3. Output to
oscilloscope
or MCU
Figure 1. Default Test Setup of Evaluation Board
Schematics
Schematics of the Evaluation Board are as shown in Figure 2.
+Vdd2
GND1
GND1
ACPL-790X
1
C5
100nF
2
3
U1
VDD1
VDD2
Vin +
Vout +
Vin -
Gnd14Gnd2
Vout -
8
7
6
5
CON1
Vdd1
Rsense+
Rsense-
CON1X3
1
9V Bat t+
2
3
Batt-/Gnd1
GND1
LM78L05ACM
GND1
236
U2
R2
10R, 1%
R3
10R, 1%
1
7
GND1
22nF
8
C1
100nF
GND1
R1
TP4
TP5
GND1
J1
C2
100nF
C3
Figure 2. Schematics of ACPL-790X Evaluation Board
GND2
GND2
J2
JUMPER
C7
100nF
R6
10K, 1%
C9
68pF
U3
L78L33ACD13TR
8
236
GND2
C14 NM
C10 68pF
R7
2
3
R9
10K, 1%
Vre f
7
10K, 1%
+-U4
4 7
1
100nF
GND2
0.1uF
C11
6
OPA237 UA
C12
0.1uF
C8
-Vdd3
TP1
C6
100nF
GND2
TP2
10K, 1%
R8
TP3
C15
NM
GND2
+Vdd3
R4
1K, 1%
R5
1K, 1%
GND2 GND2 GND2
J3
GND2GND2
C13
10uF
-Vdd3
Vre f
J4
+Vdd2
CON2
+Vdd3
1
2
3
4
5
6
6PIN HEA DER
GND2
Board Description
The ACPL-790X evaluation boards (shown in Figure 3),
can accommodate either a ACPL-790B(0.5% tolerance),
ACPL-790A(1% tolerance), or ACPL-7900(3% tolerance)
device on U1, to demonstrate the high linearity and lowo set capability of Avago’s Isolation Ampli er over a wide
range of input current conditions. It allows a designer to
easily test the performance of the high-precision isolation ampli er in an actual application under real-life operating conditions. Many of the circuit recommendations
discussed in Application Note 1078 are implemented on
the board. Operation requires merely the addition of a
5V Supply and a low-resistance shunt resistor on the input side of the isolation ampli er. The board has holes for
mounting a through-hole shunt, and pads for mounting
a surface-mount shunt. The board may also be used for
general voltage isolation without any shunt resistor.
As can be seen on the board, the isolation circuitry is easily
contained within a small area while maintaining adequate
spacing for good voltage isolation and easy assembly. The
overall size of the evaluation board has been enlarged to
allow mounting of feet for stand-alone use (using the 4
drilled holes at the corners of the board).
Using the Board
The evaluation board is easily prepared for use. Only minor preparations (just by soldering of shunt resistor, wires
for power / sense current path and output signal) are required. The evaluation board is having a default setup 1 as
shown in the tables when shipped to customer. Customer
is free to choose any one of the 6 setup con gurations as
shown in the tables by setting J1, J2, J3 and J4 as shown.
Figure 3. Top View of ACPL-790X Evaluation Board
2
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