1996 Aug 16

2

Philips Semiconductors

Product specification

9 V VHF and UHF mixers/oscillators for

TV and VCR cable tuners

TDA5632; TDA5633

FEATURES

• Balanced mixer with a common emitter input for band A

• 2-pin oscillator for band A

• Balanced mixer with a common base input for band C

• 4-pin oscillator for band C

• Local oscillator buffer output for external prescaler

• SAW filter preamplifier with a low output impedance to

drive a 75

Ω load

• Band gap voltage stabilizer for oscillator stability

• Electronic band switch

• External IF filter connected between the mixer output

and the IF amplifier input.

APPLICATIONS

• Cable tuners for TV and VTR; switched concept for VHF

• Recommended RF bands for Europe:

48.25 to 105.25 MHz, 112.25 to 294.25 MHz and

471.25 to 855.25 MHz

• Recommended RF bands for the USA:

55.25 to 133.25 MHz, 139.25 to 361.25 MHz and

367.25 to 801.25 MHz.

DESCRIPTION

The TDA5632 and TDA5633 are monolithic integrated

circuits that perform VHF and UHF mixer/oscillator

functions in TV and VCR cable tuners. With correct

oscillator application and by using a switchable inductor to

split the VHF band into two sub-bands, the full VHF/UHF

TV bands can be covered. These low-power

mixers/oscillators require a power supply of 9 V and are

available in a very small package.

The devices provide the designer with the capability to

design an economical and physically small cable tuner.

The tuner development time can be drastically reduced by

using this device.

Frequency bands are determined by the external tank

circuit. They can be adapted to various standards.

QUICK REFERENCE DATA

Note

1. The limits are related to the tank circuits used in Fig.10 and the intermediate frequency. Frequency bands may be

adjusted by the choice of external components. Another UHF frequency range is available by modifying the tank

circuit. The modification enables the following frequency range:

a) RF frequencies from 361.25 to 801.25 MHz (picture carrier).

b) Oscillator frequencies from 407 to 847 MHz. For this UHF range, L4 = 3 turns (diameter = 3.5 mm).

SYMBOL

PARAMETER

CONDITIONS

MIN.

TYP.

MAX.

UNIT

supply voltage

−

9.0

−

V

supply current

−

40

−

mA

frequency range (picture carrier)

RF input; band A; note 1

57.5

−

357.5

MHz

RF input; band C; note 1

469.5

−

887.5

MHz

voltage gain

band A (75

Ω load)

−

19

−

dB

band C (75

Ω load)

−

30

−

dB

NF

noise figure

band A (75

Ω load)

−

10

−

dB

band C (75

Ω load)

−

9.5

−

dB

output voltage to obtain 1% cross

modulation in channel

band A (75

Ω load)

−

110

−

dB

µV

band C (75

Ω load)

−

110

−

dB

µV