AD8224-EVALZ
Rev. 0 | Page 2 of 4
EVALUATION BOARD HARDWARE
JUMPER SETTINGS
Table 1.
Jumper Purpose Default
J1A, J1B, J11 Connect inputs together Unconnected
J2A, J2B, J12, J13
Connect reference pins
to ground
Connected
In the default factory setting, the reference pins of the AD8224
are connected to GND through J2A, J2B, J12, and J13. These
jumpers also connect to W2A:REF1, W2B:REF2, W13:REF2, and
W13:+IN2. Therefore, in the shipping configuration, W2A:REF1,
W2B:REF2, W13:REF2, and W13:+IN2 are connected to GND.
To disconnect the terminal from GND, remove the correspond-
ing jumper.
QUICK START
The quick start feature assumes that the jumpers are in their
default factory positions.
To begin:
1. Connect a ground lead to GND.
2. Connect a +15 V supply to +V
S
.
3. Connect a −15 V supply to −Vs.
4. Ground −IN1.
5. Connect a 1 V p-p, 1 kHz source signal to +IN1. A replica
of the signal should now appear at OUT1.
SETTING THE GAIN
The gain setting resistors are R1A and R1B for the dual-channel
part and R11A for the differential output part. The pads are
sized for 0603-sized resistors, although 0402 and 0805 sizes can
also be used.
Table 2.
Channel Component
Dual Channel A R1A
Dual Channel B R1B
Differential Output Channel R11A
EMI FILTERING
The board comes with 0603 component pads for an EMI filter.
These components are shown in
Table 3.
Table 3.
Channel Component
Dual Channel A R3A, R2A, C1A, C2A, C3A
Dual Channel B R3B, R2B, C1B, C2B, C3B
Differential Output Channel R13, R12, C11, C12, C13
The board, as shipped, does not contain EMI filtering. The
resistors pads are populated with 0 Ω resistors, and the
capacitors are not populated.
See the
AD8224 data sheet for more information on EMI
filtering.
