AD8340(2004) 查看數據表（PDF） - Analog Devices

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AD8340
(Rev.:2004)

700 MHz to 1000 MHz RF Vector Modulator

Analog Devices 

AD8340

EVALUATION BOARD

The evaluation board circuit schematic for the AD8340 is

shown in Figure 39.

The evaluation board is configured to be driven from a

single-ended 50 Ω source. Although the input of the AD8340 is

differential, it may be driven single-ended, with no loss of

performance.

The low-pass corner frequency of the baseband I and Q chan-

nels can be reduced by installing capacitors in the C11 and C12

positions. The low-pass corner frequency for either channel is

approximated by

45 kHz × 10 nF

f3dB ≈ Cexternal + 0.5 pF

On this evaluation board, the I and Q baseband circuits are

identical to each other, so the following description applies

equally to each. The connections and circuit configuration for

the Q baseband inputs are described in Table 4.

The baseband input of the AD8340 requires a differential volt-

age drive. The evaluation board is set up to allow such a drive by

connecting the differential voltage source to QBBP and QBBM.

The common-mode voltage should be maintained at approxi-

mately 0.5 V. For this configuration, Jumpers W1 to W4 should

be removed.

The baseband input of the evaluation board may also be driven

with a single-ended voltage. In this case, a bias level is provided

to the unused input from Potentiometer R10 by installing either

W1 or W2.

Setting SW1 in Position B disables the AD8340 output amplifier.

With SW1 set to Position A, the output amplifier is enabled.

With SW1 set to Position A, an external voltage signal, such as a

pulse, can be applied to the DSOP SMA connector to exercise

the output amplifier enable/disable function.

Rev. 0 | Page 16 of 20

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