Document
DATA SHEET
BIPOLAR ANALOG INTEGRATED CIRCUIT
µPC2775GR/GS
FREQUENCY DOWN CONVERTER FOR VHF-UHF BAND TV/VCR TUNER
DESCRIPTION
The µPC2775GR/GS are Silicon monolithic ICs designed for TV/VCR tuner applications. These ICs consist of double balanced mixers (DBM), local oscillator, preamplifiers for prescaler operation, IF amplifier, regulator, UHF/ VHF switching circuit, and so on. These one chip ICs cover a wide frequency band from VHF to UHF bands. These ICs are packaged in a 20 pins SSOP (shrink small outline package; µPC2775GR) or 20 pins SOP (small outline package; µPC2775GS) suitable for surface mounting. So, these ICs enable to produce economical and physically small or high-density VHF - UHF tuner and reduce the tuner development time.
FEATURES
• VHF to UHF band operation. • Low oscillation frequency drift against supply voltage and temperature fluctuation due to balanced type UHF oscillator. • These ICs can be used in single ended or differential IF outputs. • Supply voltage: 9 V • Packaged in 20 pins SSOP or 20 pins SOP suitable for surface mounting
ORDERING INFORMATION
PART NUMBER PACKAGE 20 pin plastic SSOP (225 mil) PACKAGE STYLE Embossed tape 12 mm wide, 2.5 k/REEL Pin 1 indicates pull-out direction of tape Embossed tape 24 mm wide, 2.5 k/REEL Pin 1 indicates pull-out direction of tape
µPC2775GR-E1 µPC2775GS-E1
20 pin plastic SOP (300 mil)
Caution electro-static sensitive device
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. P10194EJ3V0DS00 (3rd edition) Date Published October 1999 N CP(K) Printed in Japan
The mark
shows major revised points.
©
1995, 1999
µPC2775GR/GS
PIN CONFIGURATION (Top View)
1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. UOSC COLLECTOR (Tr.1) UOSC BASE (Tr.2) UOSC BASE (Tr.1) UOSC COLLECTOR (Tr.2) UB OSC OUTPUT GND VHF OSC BASE (Tr.1) VHF OSC BASE (Tr.2) VHF OSC COLLECTOR (Tr.1) IF OUTPUT IF OUTPUT VCC MIXER OUTPUT1 MIXER OUTPUT2 VHF RF INPUT1 VHF RF INPUT2 GND UHF RF INPUT1 UHF RF INPUT2
1 2 3 4 5 6 7 8 9 10
20 19 18 17 16 15 14 13 12 11
INTERNAL BLOCK DIAGRAM
20 19 18 17 16 15 14 13 12 11
U-RF Pre Amp.
V-RF Pre Amp.
IF Amp.
MIX. REG.
U-OSC
U-OSC Buff.
V-OSC Buff.
V-OSC
U-PSC Amp. 1 2 3 4 5 6
V-PSC Amp. 7 8 9 10
2
Data Sheet P10194EJ3V0DS00
µPC2775GR/GS
PIN EXPLANATION
Pin voltage TYP. above: V mode (V) below: U mode (U) 6.90
Pin No.
Symbol
Function and Explanation
Equivalent circuit
1
UOSC collector (Tr. 1)
Collector pin of UHF oscillator. Assemble LC resonator with 2 pin ------------through capacitor ~ 1 pF to oscillate 6.25 with active feedback Loop. Base pin of UHF oscillator with balance amplifier. Connected to LC ------------resonator through feedback capacitor 3.90 ~ 300 pF. 6.00 Base pin of UHF oscillator with balance amplifier. Connected to LC ------------resonator through feedback capacitor 3.90 ~ 300 pF. 6.00 Collector pin of UHF oscillator with balance amplifier. Assemble LC resonator with 3 pin through capacitor ------------~ 1 pF to oscillate with active feedback 6.25 Loop. Double balanced oscillator with transistor 1 and transistor 2. 6.90 Switching pin for VHF or UHF operation. ------------UHF operation = 9.0 V 9.0 VHF operation = GND 0.0 UHF and VHF oscillator output pin. In case of F/S tuner application, connected PLL synthesizer IC’s input pin.
3 5
1
4 2
2
UOSC base (Tr. 2)
3
UOSC base (Tr. 1)
4
UOSC collector (Tr. 2)
5
UB
6
OSC output
REG.
5.40
------------5.40
6
From OSC
7
GND
------------0.0 3.50 5.90
0.0
VHF and UHF oscillators’ GND pin.
8
VOSC base (Tr. 1)
Base pin of VHF oscillator with Grounded through capacitor ~ 10 pF.
- - - - - - - - - - - - - balance amplifier.
Base pin of VHF oscillator with balance amplifier. Assemble LC ------------resonator with 10 pin to oscillate with 5.90 active feedback Loop. 3.50 Base pin of VHF oscillator with balance amplifier. Connected to LC ------------resonator through feedback capacitor 6.90 ~ 3 pF. 6.20
8 10
9 REG.
9
VOSC base (Tr. 2)
10
VOSC collector (Tr. 1)
Data Sheet P10194EJ3V0DS00
3
µPC2775GR/GS
Pin voltage TYP. above: V mode (V) below: U mode (U)
Pin No.
Symbol
Function and Explanation
Equivalent circuit
11 12
IF output 5.80
-------------
IF output pins of VHF-UHF band functions. Higher output power can be obtained by connecting registor (ex. 470 Ω) to the ground.
13
11 12
5.65
13
VCC
------------9.0
9.0
Power supply for VHF-UHF band functions. VHF and UHF MIX output pin. These pins should be equipped with tank circuit to adjust frequency.
13 14 15
14
MIX output 1 MIX output 2 VRF input (bypass)
------------6.95
7.05
15
------------6.95 2.75 VRF signal input pin from antenna.
17 16
7.05
16
VHF OSC
From
------------2.80 2.75 2..