AD8342ACPZ-R2 datasheet(21/25 Pages) AD

21 / 25 page

Data Sheet

AD8342

Rev. C | Page 21 of 25

COMM

1nF

LO IN

0.1µF

+5V

IF OUT

100pF

1.82kΩ

0.1µF

100pF

0.1µF

100pF

1nF

1pF

RF IN

100Ω

22Ω

RFCM

AD8342

RFIN

TC2-1T

VPMX

COMM

IFOP

IFOM

COMM

Figure 56. Circuit for 3.5 GHz to 3.8 GHz RF Input

FREQUENCY (GHz)

3.45

3.5

3.55

3.6

3.65

3.7

3.75

3.8

3.85

NF dB

IIP3 dBm

Gc dB

Figure 57. NF, IIP3, and Gain for 3.5 GHz to 3.8 GHz

FREQUENCY (Hz)

–30

–25

–20

–15

–10

–5

+10

500k

1.0M

1.5M

2.0M

2.5M

3.0M

3.5M

4.0M

4.5M

RF S11

LO S11

100Ω TERMINATION BETWEEN RFIN AND RFCM

RFIN w/1pF TO GND

RFCM w/22Ω + 1nF TO GND

Figure 58. RF and LO Return Loss with Matching

LOW FREQUENCY APPLICATIONS

The AD8342 can be used in extremely low frequency appli-

cations. Figure 59 depicts the configuration with necessary

modifications at IF ports. Two 10 Ω resistors bias the open-

collector outputs and the output coupling capacitors must be

large enough to allow intended low frequency operation. Figure 60

illustrates the gain performance at fixed IF of 10 kHz and 1 MHz

for broadband downconversion using a low-side LO.

COMM

1nF

LO IN

0.1µF

1N4148

+5V

100pF

1.82kΩ

0.1µF

100pF

0.1µF

100pF

1nF

RF IN

100Ω

10Ω

10µF

RFCM

AD8342

RFIN

VPMX

COMM

IFOP

IFOM

BALANCED

OUTPUT

COMM

Figure 59. Modified Evaluation Board Schematic for Downconverting

Broadband RF to Low IF Frequencies

0.7

0.9

1.1

1.3

1.5

1.7

1.9

2.1

2.3

2.5

2.7

RF FREQUENCY (GHz)

IF = 1MHz

IF = 10kHz

Figure 60. Gain Performance for 1 MHz and 10 kHz IF of Broadband

Downconversion

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