AD8367
Table 7 details the various configuration options of the evaluation board.
Table 7. Evaluation Board Configuration Options
Component
TP1, TP2
TP3, TP4
SW1
Function
Default Condition
Not Applicable
Not Applicable
SW1 = A
Supply and Ground Vector Pins.
Mode and Gain Vector Pins.
VGA/AGC Select: Used to select VGA (Position A) or AGC (Position B) mode of
operation. SW2 must be set for Position A for AGC mode of operation.
SW2
LK1
MODE Select. Used to select positive or negative VGA slope. Set to Position B for an
increasing gain with VGAIN, Position A for decreasing gain law.
SW2 = B
Device Enable. When LK1 is installed, the ENBL pin is connected to the positive supply LK1 = Installed
and the AD8367 is in operating mode.
R1, R2
Input Interface. R1 and R2 are used to provide an L-pad impedance-transforming
network. The broadband matching network transforms a 50 Ω source to match a
200 Ω load with 11.5 dB of insertion loss.
R1 = 57.6 Ω (Size 0603)
R2 = 174 Ω (Size 0603)
R3, R4, C4
Output Interface. R3 and R4 are used to transform a 50 Ω load termination to look like
a 200 Ω load with 11.5 dB of insertion loss. The ac coupling capacitor, C4, can be
increased to obtain a lower high-pass corner frequency.
R3 = 57.6 Ω (Size 0603)
R4 = 174 Ω (Size 0603)
C4 = 0.1 μF (Size 0603)
C1, C2, C3, R5, R6 Power Supply Decoupling. The nominal supply decoupling consists of a 1 μF capacitor C1 = 1 μF (Size 0603)
to ground, a 4.7 Ω series resistor, and a 0.1 μF capacitor to ground. The same
decoupling network should be used on both the VPSI and VPSO supply lines.
R5 = R6 = 4.7 Ω (Size 0805)
C2 = C3 = 0.1 μF (Size 0603)
C5
CHP
Internal Supply Decoupling. Capacitor C5 provides midsupply decoupling.
Filter Capacitor. HPFL capacitor, sets the high-pass corner frequency.
C5 = 10 nF (Size 0603)
CHP = 0.01 μF (Size 0805)
R
HP = 0 Ω (Size 0603)
CAGC
R7
RHP
AGC Filter Capacitor. Capacitor, CAGC, sets closed-loop AGC response time.
Mode Pull-Up Resistor.
High-Pass Filter Resistor.
CAGC = 0.1 μF (Size 0805)
R7 = 10 kΩ (Size 0805)
RHP = 100 Ω (Size)
CHARACTERIZATION SETUP AND METHODS
Minimum-loss, L-pad matching networks were used to
interface standard 50 Ω. A test equipment to the 200 Ω input
impedance during the characterization process. Using a 57.6 Ω
shunt resistor followed by a 174 Ω series resistor provides a
broadband match between the 50 Ω test equipment and the
200 Ω device impedance, as illustrated in Figure 45. The
insertion loss of this network is 11.5 dB.
AD8367
174Ω
174Ω
57.6Ω
57.6Ω
Figure 45. Characterization Test Setup
Rev. A | Page 20 of 24
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