AD6459 datasheet(6/12 Pages) AD

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AD6459

–6–

REV. 0

INTERMEDIATE FREQUENCY – dB

545

VGAIN = 0.2V

VGAIN = 1.0V

VGAIN = 1.5V

VGAIN = 2.25V

Figure 9. IF Amplifier and Demodulator Gain vs.

Frequency, TA = +25°C, VPOS = 2.7 V, VREF = 1.2 V

IF FREQUENCY – MHz

12000

6000

100

10000

8000

4000

2000

R SHUNT, VGAIN = 2.2V

C SHUNT, VGAIN= 1.0V

R SHUNT, VGAIN= 1.0V

R SHUNT, VGAINS= 0.2V

C SHUNT, VGAIN = 2.2V

C SHUNT, VGAIN = 0.2V

3.5

3.0

2.5

2.0

1.5

1.0

0.5

Figure 10. IF Amplifier Input Impedance vs.

Frequency, TA = +25

°C, V

POS = 2.7 V, VREF = 1.2 V

GAIN VOLTAGE – Volts

–5

–10

–55

2.5

0.5

1.5

–25

–40

–45

–50

–15

–20

–35

–30

Figure 11. IF Amplifier/Demodulator Input 1 dB

Compression Point vs. VGAIN , FIF = 19.5 MHz,

VREF = 1.2 V, TA = +25°C, VPOS = 2.7 V

GAIN VOLTAGE – Volts

0.8

2.5

0.5

1.5

0.2

–0.6

–0.8

–1.0

0.6

0.4

–0.4

–0.2

MIXER

IF AMP/DEMOD

Figure 12. AD6459 Gain Error vs. Gain Control

Voltage, Representative Part

FREF FREQUENCY – MHz

3.0

545

2.5

2.0

1.5

1.0

0.5

Figure 13. Demodulator Quadrature Error vs.

FREF Frequency, TA = +25

°C, V

POS = 2.7 V

CARRIER FREQUENCY – kHz

–90

–95

–120

0.1

10k

100

–100

–105

–110

–115

Figure 14. PLL Phase Noise vs. Frequency,

VPOS = 3 V, C10 = 1 nF, FREF = 13 MHz

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