AD8367-EVAL Analog Devices Inc, AD8367-EVAL Datasheet - Page 20

• Manufacturer Part Number: AD8367-EVAL
• Description: BOARD EVAL FOR AD8367
• Manufacturer: Analog Devices Inc

Specifications of AD8367-EVAL

• Rohs Status: RoHS non-compliant

AD8367
Table 7 details the various configuration options of the evaluation board.
Table 7. Evaluation Board Configuration Options
Component
TP1, TP2
TP3, TP4
SW1
SW2
LK1
R1, R2
R3, R4, C4
C1, C2, C3, R5, R6
C5
C
C
R7
R
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.
HP
HP
AGC
Function
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.
MODE Select. Used to select positive or negative VGA slope. Set to Position B for an
increasing gain with V
Device Enable. When LK1 is installed, the ENBL pin is connected to the positive supply
and the AD8367 is in operating mode.
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.
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.
Power Supply Decoupling. The nominal supply decoupling consists of a 1 μF capacitor
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.
Internal Supply Decoupling. Capacitor C5 provides midsupply decoupling.
Filter Capacitor. HPFL capacitor, sets the high-pass corner frequency.
AGC Filter Capacitor. Capacitor, CAGC, sets closed-loop AGC response time.
Mode Pull-Up Resistor.
High-Pass Filter Resistor.
GAIN
, Position A for decreasing gain law.
Rev. A | Page 20 of 24
Figure 45. Characterization Test Setup
57.6Ω
174Ω
AD8367
Default Condition
Not Applicable
Not Applicable
SW1 = A
SW2 = B
LK1 = Installed
R1 = 57.6 Ω (Size 0603)
R2 = 174 Ω (Size 0603)
R3 = 57.6 Ω (Size 0603)
R4 = 174 Ω (Size 0603)
C4 = 0.1 μF (Size 0603)
C1 = 1 μF (Size 0603)
R5 = R6 = 4.7 Ω (Size 0805)
C2 = C3 = 0.1 μF (Size 0603)
C5 = 10 nF (Size 0603)
C
R
C
R7 = 10 kΩ (Size 0805)
R
HP
HP
HP
AGC
57.6Ω
174Ω
= 0 Ω (Size 0603)
= 100 Ω (Size)
= 0.01 μF (Size 0805)
= 0.1 μF (Size 0805)