Evaluates: MAX3866
MAX3866 Evaluation Kit
2
_______________________________________________________________________________________
Adjustment and Control Description
CONTROL
NAME
FUNCTION/MANIPULATION
VCCD
VCCD
Power-Supply Voltage. Both pins of this dual-pin header are the same
point.
VCCS
VCCS
Power-Supply Select Jumper.
Do not apply any external voltages at
this point.
Both pins of this 2-pin header are not connected electrically.
Depending on what the operating voltage is, either place a shunt at
VCCS or remove the shunt from VCCS. When evaluating at 3.14V to
3.47V, ensure that there is a shunt on VCCS. If the evaluation voltage is
5.0V to 5.5V, remove this shunt and place a 100nF capacitor in location
C8. (EV kit is shipped with 100nF in the C8 location; see
Figure 1.)
J1
INPUT
Single-Ended Input, 3mVp-p to 2.5Vp-p range. This translates into a
current of 3µA to 2.5mA, respectively (voltage at input) / (R3 = 1k
Ω
).
Note that the EV kit input is terminated for a 50
Ω
source.
J4, J5
OUTP, OUTM
Signal Outputs (AC-coupled). Note that the EV kit outputs are designed
for 50
Ω
termination.
R6, R9
—
Micro and Macro Current Adjustment. Simulates the average DC
current portion of a diode. The amount of current that should be set
through these potentiometers is calculated by the formula (AC current
into MAX3866) / 2 = DC bias current.
CR1
DIODE
LOP is active high. Therefore, when an LOP condition exists, the LED
will be off.
TP1
LOP
TTL Output, active high. Probe this test point only with a high-imped-
ance lead.
R1
—
Sets the LOP Threshold. For normal operation, Maxim recommends R8
+ R1 = 510
Ω
. However, if other values are desired, please refer to the
Typical Operating Characteristics section (Assert/Deassert vs. R
PD
) of
the MAX3866 data sheet.
SJ2
—
Solder Jumper. For normal operation, ensure that this solder jumper is
open.