AD6432AST datasheet(8/20 Pages) AD

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AD6432

–8–

REV. 0

INTERMEDIATE FREQUENCY – MHz

–10

VGAIN = 0.2V

VGAIN = 0.5V

VGAIN = 1.5V

VGAIN = 2.4V

Figure 9. IF Amplifier and Demodulator Gain vs. IF

Frequency, TA = +25°C, VPOS = 3 V, VGREF = 1.2 V

IF INPUT FREQUENCY – MHz

13000

12000

11000

10000

9000

8000

7000

6000

5000

4000

3000

VGAIN = 2.4V

VGAIN = 1.2V

VGAIN = 0.2V

VGAIN = 1.2V

VGAIN = 2.4V

2.0

2.2

2.4

2.6

2.8

3.0

3.2

3.4

3.6

3.8

4.0

Figure 10. IF Amplifier Input Impedance vs. Frequency,

TA = +25°C, VPOS = 3 V, VGREF = 1.2 V

VGAIN – Volts

0.5

1.0

1.5

2.0

2.5

–60

–50

–40

–30

–20

–10

Figure 11. IF Amplifier/Demodulator Input 1 dB

Compression Point vs. VGAIN , FIF = 26 MHz,

VGREF = 1.2 V, TA = +25°C, VPOS = 3 V

VGAIN – Volts

0.5

1.0

1.5

2.0

2.5

–0.2

–0.1

0.1

0.2

0.3

0.4

MIXER

IF AMP/DEMOD

Figure 12. Gain Error vs. Gain Control Voltage, TA = +25°C,

VPOS = 3 V, VGREF = 1.2 V, FRF = 250 MHz, FIF = 26 MHz

DEMODULATOR VCO FREQUENCY – MHz

–1.4

–1.2

–1.0

–0.8

–0.6

–0.4

–0.2

0.2

0.4

0.6

Figure 13. Demodulator Quadrature Error vs. FREF

Frequency, TA = +25°C, VPOS = 3 V

FREQUENCY OFFSET – kHz

0.1

1.0

100

1000

–110

–105

–80

–85

–90

–95

–100

IF = 26MHz

IF = 13MHz

Figure 14. PLL Phase Noise vs. Frequency, VPOS = 3 V,

CFLTR =1 nF, RFLTR =1 kΩ, FREF = 13 MHz

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