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AD8340
(Rev.:2004)

700 MHz to 1000 MHz RF Vector Modulator

Analog Devices 

AD8340

Table 4. Evaluation Board Configuration Options

Components Function

R7, R9, R11,

R14, R15, R19,

R20, R21, C15,

C19, W3, W4

I Channel Baseband Interface. Resistors R7 and R9 may be installed to accommodate a

baseband source that requires a specific terminating impedance. Capacitors C15 and C19

are bypass capacitors.

For single-ended baseband drive, the Potentiometer R11 can be used to provide a bias level

to the unused input (install either W3 or W4).

R1, R3, R10,

R12, R13, R16,

R17, R18, C16,

C20, W1, W2

Q Channel Baseband Interface. See the I Channel Baseband Interface section.

C11, C12

T1, C17, C18,

L1, L2

Baseband Low-Pass Filtering. By adding Capacitor C11 between QFLP and QFLM, and C12

between IFLP and IFLM, the 3 dB low-pass corner frequency of the baseband interface can

be reduced from 230 MHz (nominal). See equation in text.

Output Interface. The 1:1 balun transformer, T1, converts the 50 Ω differential output to

50 Ω single-ended. C17 and C18 are dc blocks. L1 and L2 provide dc bias for the output.

L3, L4, C5, C6

C2, C4, C7,

C9, C14, C1,

C3, C8, C10,

R2, R4, R5, R6

Input Interface. The input impedance of the AD8340 requires 5.6 nH inductors in series

with RFIP and RFIM for optimum return loss when driven by a single-ended 50 Ω line. C5

and C6 are dc blocks.

Supply Decoupling.

R8, SW1

Output Disable Interface. The output stage of the AD8340 is disabled by applying a high

voltage to the DSOP pin by moving SW1 to Position B. The output stage is enabled moving

SW1 to Position A. The output disable function can also be exercised by applying an exter-

nal high or low voltage to the DSOP SMA connector with SW1 in Position A.

Default Conditions

R7, R9 = Not Installed

R11 = Potentiometer, 2 kΩ,

10 Turn (Bourns)

R14 = 4 kΩ (Size 0603)

R15 = 44 kΩ (Size 0603)

R19, R20, R21 = 0 Ω

(Size 0603)

C15, C19 = 0.1 µF

(Size 0603)

W3 = Jumper (Installed)

W4 = Jumper (Open)

R1, R3 = Not Installed

R10 = Potentiometer, 2 kΩ,

10 Turn (Bourns)

R12 = 4 kΩ (Size 0603)

R13 = 44 kΩ (Size 0603)

R16, R17, R18 = 0 Ω

(Size 0603)

C16, C20 = 0.1 µF

(Size 0603)

W1 = Jumper (Installed)

W2 = Jumper (Open)

C11, C12 = Not Installed

C17, C18 = 100 pF

(Size 0603)

T1 = ETC1-1-13 (M/A-COM)

L1, L2 = 120 nH

(Size 0603)

L3, L4 = 5.6 nH (Size 0402)

C5, C6 = 100 pF (Size 0603)

C2, C4, C7, C9, C14 = Open

(Size 0603)

C1, C3, C8, C10 = 0.1 µF

(Size 0603)

R2, R4, R5, R6 = 0 Ω

(Size 0603)

R8 = 10 kΩ (Size 0603)

SW1 = SPDT (Position A,

Output Enabled)

Rev. 0 | Page 17 of 20

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