SA5209N Просмотр технического описания (PDF) - Philips Electronics

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SA5209N

Wideband variable gain amplifier

Philips Electronics 

Philips Semiconductors

Wideband variable gain amplifier

Product specification

NE/SA5209

CRYSTAL

FILTER

+5V

50Ω

SOURCE

50Ω

OUTPUT

5209

VBG

VAGC

R1

R2

Gain = 19dB + 20log10 VAGC

50Ω

ƪ ƫ where VAGC =

R2

R1 ) R2

VBG

and is in units of Volts, for VAGC ≤ 1V

SR00247

Figure 11. User-Programmable Fixed Gain Block

RF INPUT

50Ω

SOURCE

+5V

5209

VAGC

.5V

R

9R

FULL CARRIER

AM (DSB)

50Ω

OUTPUT

50Ω

+5V

All harmonic distortion products will be

at least -50dBc over the audio spectrum.

Figure 12. AM Modulator

MODULATING

SIGNAL

SR00248

5209

5209

5209

50Ω

OUTPUT

VAGC

VAGC

50Ω

VAGC

The high input impedance to the NE5209 makes matching

to crystal filters relatively easy. The total delta gain of this

system will approach 80dB. IF frequencies well into the UHF

region can be configured with this type of architecture.

Figure 13. Receiver AGC IF Gain

RS

VS ±

RT

VCC (+5V, unless otherwise noted)

5209

RL

RT

± VAGC

RL

Figure 14. Test Set-up 1 (Used for all Graphs)

GAIN CONTROL

SIGNAL

SR00249

SR00250

1990 Aug 20

8

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