RF3320 查看數據表（PDF） - RF Micro Devices

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RF3320

CABLE REVERSE PATH PROGRAMMABLE GAIN AMPLIFIER

RF Micro Devices 

Preliminary

RF3320

Parameter

Specification

Unit

Min.

Typ.

Max.

Condition

AC Specifications, cont’d

Output Step Size

0.8

1.0

1.1

dB

Isolation in Transmit Disable

-80

-95

dBc

Maximum Gain, 20MHz

Mode

Output Noise

Maximum Gain

-37

-30

dBmV/ -96dBc for a 59dBmV carrier in a 160kHz

160kHz bandwidth.

Minimum Gain

-55

-50

dBmV/ -64dBc for an 8dBmV carrier in a 160kHz

160kHz bandwidth.

3

Transmit Disabled

-75

-70

dBmV/ TXEN =0

160 kHz

TX EN Enable Time

0.5

1.0

µS

Time for gain to reach 99% of final value.

See Note 1.

TX EN Transient Duration

2.4

3.0

µS

See Note 1.

Output Switching Transients

5

10

mVP-P Maximum Gain

3

5

mVP-P Minimum Gain

Output Impedance

255

300

345

Ω

Chip output impedance is nominally 300Ω.

Differential to single-ended output conver-

sion to 75Ω is performed in a balun with a

2:1 turns ratio, corresponding to a 4:1 imped-

ance ratio.

Input Impedance

75

Ω

Differential

Thermal

ThetaJC

28

°C/W

Note 1: The enable time is determined by the value of the capacitor on pin 8 (RAMP). A higher capacitor value will

increase the enable time, but will reduce the transient voltage.

Rev A10 010514

3-29

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