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AD6458

–8–

REV. 0

FREF FREQUENCY – MHz

4.0

3.5

2.0

1.5

1.0

0.5

3.0

2.5

Figure 17. Demodulator Quadrature Error vs. FREF

Frequency, TA = +25°C, VPOS = 3.0 V

ERROR – Degrees

1.5

2.9

1.6 1.7 1.8 1.9 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8

3.0

= 2.1d

= 0.3d

Figure 18. Demodulator Quadrature Error Histogram

TA = +25°C, VPOS = 3.0 V. FIF = 13 MHz

CARRIER FREQUENCY – kHz

–90

–95

–120

0.1

10k

100

–100

–105

–110

–115

Figure 19. PLL Phase Noise vs. Frequency, VPOS = 3 V,

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

PLL FREQUENCY – MHz

–0.1

–1.5

555

–0.3

–0.5

–0.7

–0.9

–1.1

–1.3

Figure 20. PLL Loop Voltage at FLTR Pin (kVCO) vs. Frequency

VGAIN – Volts

–10

–15

–65

2.5

0.5

1.0

1.5

2.0

–30

–45

–50

–60

–20

–25

–40

–35

–55

Figure 21. System [(Mixer + IF Ceramic Filter + IF Ampli-

fier + Demodulator)] Input 1 dB Compression Point vs.

VGAIN, TA = +25°C, VPOS = 3.0 V, FIF = 13 MHz, FRF = 83 MHz,

VREF = 1.2 V

VGAIN – Volts

–20

2.5

0.5

1.0

1.5

2.0

–10

Figure 22. System (Mixer + IF Ceramic Filter + IF Amplifier

+ Demodulator) Conversion Gain vs. VGAIN, TA = +25°C,

VPOS = 3.0 V, FIF = 13 MHz, FRF = 83 MHz, VREF = 1.2 V

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