AD8350AR20 Analog Devices Inc, AD8350AR20 Datasheet - Page 12

• Manufacturer Part Number: AD8350AR20
• Description: Buffer Amplifier IC
• Manufacturer: Analog Devices Inc

Specifications of AD8350AR20

• Bandwidth: 900MHz
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC
• Rohs Status: RoHS non-compliant
• Current - Supply: 28mA
• Frequency: 0Hz ~ 1GHz
• Gain: 20dB
• Noise Figure: 5.9dB
• Rf Type: CATV
• Test Frequency: 250MHz
• Voltage - Supply: 5 V ~ 10 V
• P1db: -

AD8350
EVALUATION BOARD
Figure 13 shows the schematic of the AD8350 evaluation board,
for SOIC, as it is shipped from the factory. The board is config-
ured to allow easy evaluation using single-ended 50 Ω test
equipment. The input and output transformers have a 4-to-1
impedance ratio and transform the AD8350’s 200 Ω input and
output impedances to 50 Ω. In this mode, 0 Ω resistors (R1 and
R4) are required.
To allow compensation for the insertion loss of the transform-
ers, a calibration path is provided at Test In and Test Out. This
consists of two transformers connected back to back.
IN–
IN+
R1
0
(MINI CIRCUITS)
T1: TC4-1W
6
1
TEST IN
R2
0
0.001 F
0.001 F
C2
C1
+V
(OPEN)
S
(MINI CIRCUITS)
L1
T3: TC4-1W
6
A
B
3
2
1
8
1
SW1
1
AD8350
–
7
2
+V
6
3
S
(MINI CIRCUITS)
To drive and load the board differentially, transformers T1 and
T2 should be removed and replaced with four 0 Ω resistors
(0805 size); Resistors R1 and R4 (0 Ω) should also be removed.
This yields a circuit with a broadband input and output impedance
of 200 Ω. To match to impedances other than this, matching
components (0805 size) can be placed on pads C1, C2, C3, C4,
L1, and L2.
T4: TC4-1W
5
4
C5
0.1 F
1
6
0.001 F
0.001 F
L2
(OPEN)
C3
C4
R3
0
TEST OUT
(MINI CIRCUITS)
T2: TC4-1W
1
6
R4
0
OUT–
OUT+