The µPC2794GS is a Silicon monolithic IC designed for TV/VCR tuner applications. This IC consists of a double
balanced mixer (DBM), local oscillator, preamplifier for precscaler operation, IF amplifier, regulator, UHF/VHF
switching circuit, and so on. This one-chip IC covers a wide frequency band from VHF to UHF bands. This IC is
packaged in 20-pin SOP (Small Outline Package) suitable for surface mounting.
FEATURES
• VHF to UHF bands operation.
• Low distortionCM: VHF (@fRF = 470 MHz) 96 dB
UHF (@fRF = 890 MHz) 92 dB
• Supply voltage: 9 V
• Packaged in 20-pin SOP suitable for surface mounting
For evaluation sample order, please contact your local NEC office. (Part number for sample order: µPC2794GS)
The information in this document is subject to change without notice. Before using this document, please
confirm that this is the latest version.
Not all devices/types available in every country. Please check with local NEC representative for availability
and additional information.
Document No. P11888EJ3V0DS00 (3rd edition)
Date Published October 1999 N CP(K)
Printed in Japan
pin through capacitor ~ 1 pF to
oscillate with active feedback loop.
Base pin of UHF oscillator
to LC resonator through feedback
capacitor ~ 300 pF.
Base pin of UHF oscillator
with balance amplifier.
Connected to LC resonator
through feedback capacitor ~ 300 pF.
Collector pin of UHF oscillator
with balance amplifier. Assemble
LC resonator with 3 pin through
capacitor ~ 1 pF to oscillate with
active feedback loop.
Double balanced oscillator with
transistor 1 and transistor 2.
operation.
VHF operation = open
UHF operation = 9.0 V
These pins should be
equipped with tank circuit to
adjust intermediate frequency.
16VRF input2.75Bypass pin for VHF MIX input.
(bypass)Grounded through capacitor.
2.80
17VRF input2.75VRF signal input pin from
antenna.
2.80
12
.
14 15
13
from
VHF
17
OSC
16
18GND0.0GND pin of MIX, IF amplifier
and regulator.
0.0
19URF input –Bypass pin for UHF MIX input.
(bypass)Grounded through capacitor.
2.65
20URF input–URF signal input pin from
antenna.
2.65
4
Data Sheet P11888EJ3V0DS00
19
1415
20
13
from
UHF
OSC
µ
PC2794GS
ABSOLUTE MAXIMUM RATINGS (TA = 25 °C unless otherwise specified)
ParameterSymbolConditionRatingUnit
Supply Voltage 1VCC11.0V
Supply Voltage 2UB11.0V
Power dissipationPDTA = 80 °C*
Operating ambient temperatureTA–40 to +80°C
Storage temperatureTstg–60 to +150°C
1
700mW
*1 Mounted on 50 × 50 × 1.6 mm double copper epoxy glass board.
RECOMMENDED OPERATING RANGE
ParameterSymbolMIN.TYP.MAX.Unit
Supply voltage 1VCC8.09.010.0V
Supply voltage 2UB8.09.010.0V
Operating ambient temperatureTA–20+25+80°C