AD6459 データシートの表示（PDF） - Analog Devices
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AD6459 Datasheet PDF : 12 Pages
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AD6459
70
VGAIN = 0.2V
60
50
40
VGAIN = 1.0V
30
VGAIN = 1.5V
20
10
VGAIN = 2.25V
0
5
10
15
20
25
30
35
40 45
INTERMEDIATE FREQUENCY – dB
Figure 9. IF Amplifier and Demodulator Gain vs.
Frequency, TA = +25°C, VPOS = 2.7 V, VREF = 1.2 V
12000
3.5
C SHUNT, VGAIN = 0.2V
10000 R SHUNT, VGAIN = 2.2V
3.0
8000
C SHUNT, VGAIN= 1.0V
2.5
6000
4000
C SHUNT, VGAIN = 2.2V 2.0
R SHUNT, VGAIN= 1.0V
1.5
2000
R SHUNT, VGAINS= 0.2V
1.0
0
0.5
0 10 20 30 40 50 60 70 80 90 100
IF FREQUENCY – MHz
Figure 10. IF Amplifier Input Impedance vs.
Frequency, TA = +25°C, VPOS = 2.7 V, VREF = 1.2 V
–5
–10
–15
–20
–25
–30
–35
–40
–45
–50
–55
0
0.5
1
1.5
2
2.5
GAIN VOLTAGE – Volts
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
1
0.8
0.6
0.4
0.2
MIXER
0
–0.2
–0.4
IF AMP/DEMOD
–0.6
–0.8
–1.0
0
0.5
1
1.5
2
2.5
GAIN VOLTAGE – Volts
Figure 12. AD6459 Gain Error vs. Gain Control
Voltage, Representative Part
3.0
2.5
2.0
1.5
1.0
0.5
0
5
10
15
20
25
30
35
40 45
FREF FREQUENCY – MHz
Figure 13. Demodulator Quadrature Error vs.
FREF Frequency, TA = +25°C, VPOS = 2.7 V
–90
–95
–100
–105
–110
–115
–120
0.1
1
10
100
1k
10k
CARRIER FREQUENCY – kHz
Figure 14. PLL Phase Noise vs. Frequency,
VPOS = 3 V, C10 = 1 nF, FREF = 13 MHz
–6–
REV. 0
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