RC2798 datasheet(3/12 Pages) FAIRCHILD

Part #	RC2798

Description	Integrated QAM IF Downconverter

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Manufacturer	FAIRCHILD [Fairchild Semiconductor]

Direct Link	http://www.fairchildsemi.com

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PRODUCT SPECIFICATION

RC2798

3

Electrical Characteristics (TA = 25°C )

Standard Characteristics (VCC = 5V, TA = 25°C)

Parameter

Test conditions

Min.

Typ.

Max.

Unit

AGC Amplifier, Oscillator, and Mixer Blocks (Vcc = 5V)

Icc1

Supply current 1

no input signal

17.0

23.0

31.0

mA

fRF

RF input frequency range

30

250

MHz

fOSC

OSC frequency range

30

250

MHz

fIF

IF output frequency range

DC

150

MHz

CGMAX

Maximum conversion gain

VAGC = 4.0V

25

dB

CGMIN

Minimum conversion gain

VAGC = 1.0V

-7

dB

GCR

AGC dynamic range

VAGC = 1.0 to 4.0V

24

32

40

dB

NF

Noise figure

SSB, VAGC = 4.0V

At maximum gain

9dB

VAGC H

AGC voltage high level

At maximum gain

4.0

V

VAGC L

AGC voltage low level

At minimum gain

1.0

V

Video Amplifier Block (Vcc = 5V)

Icc2

Supply current 2

No input signal

7.0

12.5

17.0

mA

VOUT

Output voltage

RL = 1K

W, differential

3.0

Vp-p

G1

Differential gain 1

G1A-G1B pins: short,

VOUT = 3Vp-p

150

200

250

V/V

G2

Differential gain 2

G1A-G1B pins: open,

VOUT = 3Vp-p

22.0

26.0

30.0

V/V

Video Amplifier Block (Vcc = 9V)

Icc2

Supply current 2

no input signal

18.0

24.0

32.0

mA

VOUT

Output voltage

RL = 1K

W, differential

3.0

Vp-p

G1

Differential gain 1

G1A-G1B pins: short,

RL = 2K

W

300

385

470

V/V

G2

Differential gain 2

G1A-G1B pins: open,

RL = 2K

W

25.0

28.5

32.0

V/V

Video Amplifier Block (Vcc = 5V or 9V)

BWG1

Bandwidth 1

G1

50

MHz

BWG2

Bandwidth 2

G2

50

MHz

Rin1

Input resistance 1

G1

3.5

K

W

Rin2

Input resistance 2

G2

7.5

K

W

Cin

Input capacitance

1.6

pF

Parameter

Test conditions

Min.

Typ.

Max.

Unit

AGC Amplifier Block (Vcc = 5V)

AGC IIP3

AGC input intercept point

At minimum gain

(AGC amplifier + mixer)

-9

dBm

Video Amplifier Block (Vcc = 5V or 9V)

CMRR

Common mode rejection ratio

80

dB

PSRR

Power supply rejection ratio

70

dB

tr

Rise time

2.6

nS

tPD

Propagation delay time

4.4

nS

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