AD6458ARS datasheet(7/12 Pages) AD

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AD6458

–7–

REV. 0

VGAIN – Volts

–8

–9

–15

2.5

0.5

1.0

1.5

2.0

–11

–12

–13

–14

–10

VPOS = 3.6V

TA = +85°C

VPOS = 3.0V

TA = +85°C

VPOS = 3.6V

TA = +25°C

VPOS = 3.0V

TA = +25°C

VPOS = 3.0V

TA = –25°C

VPOS = 3.0V

TA = –40°C

Figure 11. Mixer Input 1 dB Compression Point vs. VGAIN,

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

INTERMEDIATE FREQUENCY – dB

545

VGAIN = 0.2V

VGAIN = 1.0V

VGAIN = 1.5V

VGAIN = 2.25V

Figure 12. IF Amplifier and Demodulator Gain vs.

Frequency, TA = +25°C, VPOS = 3.0 V, VREF =1.2 V

VGAIN – Volts

–10

2.5

0.5

1.0

1.5

2.0

TA = –40°C TO +85°C

Figure 13. IF Amplifier and Demodulator Gain vs.

VGAIN, TA = +25°C, VPOS = 3.0 V, FIF = 13 MHz, VREF = 1.2 V

VGAIN – Volts

–5

–10

–60

2.5

0.5

1.0

1.5

2.0

–25

–40

–45

–50

–15

–20

–35

–30

–55

TA = –40°C

TA = –25°C

TA = +25°C

TA = +85°C

Figure 14. IF Amplifier/Demodulator Input 1 dB Compres-

sion Point vs. VGAIN, FIF =13 MHz, VREF = 1.2 V, TA = +25°C,

VPOS = 3.0 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, VGAIN = 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 15. IF Amplifier Input Impedance vs. Frequency,

TA = +25°C, VPOS = 3.0 V, VREF = 1.2 V

GAIN VOLTAGE – Volts

0.8

2.5

0.5

1.5

0.2

–0.6

–0.8

–1

0.6

0.4

–0.4

–0.2

MIXER

IF AMP/DEMOD

Figure 16. AD6458 Gain Error vs. Gain Control Voltage,

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