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DATA SHEET
BIPOLAR ANALOG INTEGRATED CIRCUIT
PC2794GS
FREQUENCY DOWN CONVERTER FOR VHF TO UHF BAND TV/VCR TUNER
DESCRIPTION
The PC2794GS 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 distortion * Supply voltage CM: VHF (@fRF = 470 MHz) 96 dB UHF (@fRF = 890 MHz) 92 dB : 9V * Packaged in 20-pin SOP suitable for surface mounting
ORDERING INFORMATION
Part Number Package 20-pin plastic SOP (300 mil) Package Style Embossed tape 24 mm wide. 2.5 k/REEL. Pin 1 indicates pull-out direction of tape
PC2794GS-E1
For evaluation sample order, please contact your local NEC office. (Part number for sample order: PC2794GS)
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. P11888EJ3V0DS00 (3rd edition) Date Published October 1999 N CP(K) Printed in Japan
The mark
shows major revised points.
(c)
1996,1999
PC2794GS
PIN CONFIGURATION (Top View)
1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. UHF OSC Collector UHF OSC Base UHF OSC Base UHF OSC Collector UB OSC OUTPUT GND VHF OSC Base VHF OSC Base VHF OSC Collector REG IF OUTPUT VCC MIX OUTPUT MIX OUTPUT VHF RF INPUT VHF RF INPUT GND UHF RF INPUT UHF RF INPUT (Tr. 1) (Tr. 2) (Tr. 1) (Tr. 2)
1
20
(Tr. 1) (Tr. 2) (Tr. 1)
10
11
INTERNAL BLOCK DIAGRAM
20 19 18 17 16 15 14 13
IF Amp
12
11
REG. U OSC V OSC
1
2
3
4
5
6
7
8
9
10
2
Data Sheet P11888EJ3V0DS00
PC2794GS
PIN EXPLANATION
Pin Voltage TYP. above: VHF mode below: UHF mode 6.90 6.25 6.00 3.90 3 UOSC base (Tr. 1) 6.00 3.90 4 UOSC collector (Tr. 2) 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 with active feedback loop. Base pin of UHF oscillator with balance amplifier. Connected 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. Switching pin for VHF or UHF operation. VHF operation = open UHF operation = 9.0 V
3 5 1 4 2
2
UOSC base (Tr. 2)
6.25
5
UB
-- 9.0
6
OSC output
5.40
UHF and VHF oscillator output pin. In case of F/S tuner application, connected PLL symthesizer IC's input pin.
REG
5.40
6
from OSC
7
GND
0.0 0.0
GND pin of VHF and UHF oscillator. Base pin of VHF oscillator. Grounded through capacitor ~ 10 pF. Base pin of VHF oscillator. Assemble LC resonator with 10 pin to oscillate with active feedback loop. Collector pin of VHF oscillator. Connected to LC resonator through feedback capacitor ~ 3 pF.
8
VOSC base (Tr. 1)
3.50 5.90 3.50 5.90 6.20 6.90
8
10
9 REG
9
VOSC base (Tr. 2)
10
VOSC collector (Tr. 1)
Data Sheet P11888EJ3V0DS00
3
PC2794GS
Pin Voltage TYP. above: VHF mode below: UHF mode 6.90 6.90 12 IF output 2.60
Pin No.
Symbol
Function and Explanation
Equivalent Circuit
11
REG
Monitor pin of regulator output voltage. IF output pin of VHF-UHF band functions.
13
2.60
12
13
VCC
9.0 9.0
Power supply pin for VHFUHF band functions. VHF and UHF MIX output pins. These pins should be equipped with tank circuit to adjust intermediate frequency. Bypass pin for VHF MIX input. Grounded through capacitor.
14
MIX output1
7.10 7.00 7.10 7.00 2.75
13
14 15
15
MIX output2
16
VRF input (bypass)

from VHF OSC
2.80
17
16
17
VRF input
2.75
VRF signal input pin from antenna.
2.80
18
GND
0.0
GND pin of MIX, IF amplifier and regulator. 14 15 13
0.0 from UHF OSC
19
URF input (bypass)
-
Bypass pin for UHF MIX input. Grounded through capacitor. 19 20

2.65
20
URF input
-
URF signal input pin from antenna.
2.65
4
Data Sheet P11888EJ3V0DS00
PC2794GS
ABSOLUTE MAXIMUM RATINGS (TA = 25 C unless otherwise specified)
Parameter Supply Voltage 1 Supply Voltage 2 Power dissipation Operating ambient temperature Storage temperature Symbol VCC UB PD TA Tstg TA = 80 C*1 Condition Rating 11.0 11.0 700 -40 to +80 -60 to +150 Unit V V mW C C
*1 Mounted on 50 x 50 x 1.6 mm double copper epoxy glass board. RECOMMENDED OPERATING RANGE
Parameter Supply voltage 1 Supply voltage 2 Operating ambient temperature Symbol VCC UB TA MIN. 8.0 8.0 -20 TYP. 9.0 9.0 +25 MAX. 10.0 10.0 +80 Unit V V C
ELECTRICAL CHARACTERISTICS (TA = 25 C, VCC = 9 V, fIF = 45 MHz, Posc = -10 dBm)
Parameter Circuit Current 1 Circuit Current 2 Conversion Gain 1 Conversion Gain 2 Conversion Gain 3 Conversion Gain 4 Conversion Gain 5 Noise Figure 1 Noise Figure 2 Noise Figure 3 Noise Figure 4 Noise Figure 5 Maximum Output Power 1 Maximum Output Power 2 Maximum Output Power 3 Maximum Output Power 4 Maximum Output Power 5 Symbol ICC1 ICC2 CG1 CG2 CG3 CG4 CG5 NF1 NF2 NF3 NF4 NF5 PO (sat)1 PO (sat)2 PO (sat)3 PO (sat)4 PO (sat)5 Test Conditions @VHF, no input signal @UHF, no input signal fRF = 55 MHz, PRF = -30 dBm fRF = 200 MHz, PRF = -30 dBm fRF = 470 MHz, PRF = -30 dBm fRF = 470 MHz, PRF = -30 dBm fRF = 890 MHz, PRF = -30 dBm fRF = 55 MHz fRF = 200 MHz fRF = 470 MHz fRF = 470 MHz fRF = 890 MHz fRF = 55 MHz, PRF = 0 dBm fRF = 200 MHz, PRF = 0 dBm fRF = 470 MHz, PRF = 0 dBm fRF = 470 MHz, PRF = 0 dBm fRF = 890 MHz, PRF = 0 dBm *1 *1 *2 *2 *2 *2 *2 *3 *3 *3 *3 *3 *2 *2 *2 *2 *2 MIN. 36.0 37.0 19.5 19.5 20.5 28.5 28.5 -- -- -- -- -- 10.0 10.0 10.0 10.0 10.0 TYP. 48.0 50.0 23.0 23.0 24.0 32.0 32.0 11.0 11.0 11.0 9.0 10.0 13.0 13.0 13.0 13.0 13.0 MAX. 56.0 60.0 26.5 26.5 27.5 35.5 35.5 14.0 14.0 14.0 12.0 13.0 -- -- -- -- -- Unit mA mA dB dB dB dB dB dB dB dB dB dB dBm dBm dBm dBm dBm
*1 By measurement circuit 1 *2 By measurement circuit 2 *3 By measurement circuit 3
Data Sheet P11888EJ3V0DS00
5
PC2794GS
STANDARD CHARACTERISTICS (Reference Values) (TA = 25 C, VCC = 9 V)
Parameter 1 % cross-modulation distortion 1 Symbol CM1 Test Conditions fdes = 55 MHz, fundes = fdes + 6 MHz, Pdes = -30 dBm, fIF = 45 MHz, Posc = -10 dBm, AM 100 kHz, 30 % modulation, DES/CM = 46 dBc fdes = 200 MHz, fundes = fdes + 6 MHz, Pdes = -30 dBm, fIF = 45 MHz, Posc = -10 dBm, AM 100 kHz, 30 % modulation, DES/CM = 46 dBc fdes = 470 MHz, fundes = fdes + 6 MHz, Pdes = -30 dBm, fIF = 45 MHz, Posc = -10 dBm, AM 100 kHz, 30 % modulation, DES/CM = 46 dBc fdes = 470 MHz, fundes = fdes + 6 MHz, Pdes = -30 dBm, fIF = 45 MHz, Posc = -10 dBm, AM 100 kHz, 30 % modulation, DES/CM = 46 dBc fdes = 890 MHz, fundes = fdes + 6 MHz, Pdes = -30 dBm, fIF = 45 MHz, Posc = -10 dBm, AM 100 kHz, 30 % modulation, DES/CM = 46 dBc Value for Reference 100 Unit dB
*1 100 dB
1 % cross-modulation distortion 2
CM2
*1 96 dB
1 % cross-modulation distortion 3
CM3
*1 94 dB
1 % cross-modulation distortion 4
CM4
*1 92 dB
1 % cross-modulation distortion 5
CM5
*1
*1 By measurement circuit 4
6
Data Sheet P11888EJ3V0DS00
PC2794GS
TYPICAL CHARACTERISTICS
ICC vs. VCC 80 VHF no input signal 70 measurement circuit 1 60 50 40 30 20 10 0 0 2 4 6 8 TA = 80 C TA = 25 C TA = -20 C 10 12 50 UHF no input signal 70 measurement circuit 1 60 50 40 30 20 10 0 0 2 4 6 8 TA = 80 C TA = 25 C TA = -20 C 10 12 ICC vs. VCC
ICC - Circuit Current - mA
VCC - Supply Voltage - V
ICC - Circuit Current - mA
VCC - Supply Voltage - V
Pout vs. Pin 20 VCC = 9 V fRF = 470 MHz fIF = 45 MHz POSC = -10 dBm 10 measurement circuit 2 20 VCC = 9 V fRF = 890 MHz fIF = 45 MHz POSC = -10 dBm 10 measurement circuit 2
Pout vs. Pin
Pout - Output Power - dBm
0
Pout - Output Power - dBm
0
-10 TA = 80 C TA = 25 C TA = -20 C -20 -40 -30 -20 -10 0 10
-10 TA = 80 C TA = 25 C TA = -20 C -20 -40 -30 -20 -10 0 10 Pin - Input Power - dBm
Pin - Input Power - dBm
CG, NF vs. fRF 40
CM - 1 % Cross-modulation Distortion - dB
CM vs. fRF 120 VCC = 9 V fundes = fRF + 6 MHz PRF = -30 dBm fIF = 45 MHz 110 POSC = -10 dBm measurement circuit 4 100
NF - Noise Figure - dB CG - Conversion Gain - dB
VCC = 9 V fIF = 45 MHz PRF = -30 dBm POSC = -10 dBm 30 measurement circuit 2, 3
20
10 TA = 80 C TA = 25 C TA = -20 C 0 0 200 400 600 800 1 000
90 TA = 80 C TA = 25 C TA = -20 C 80 0 200 400 600 800 1 000
fRF - Input Frequency - MHz
fRF - Input Frequency - MHz
Data Sheet P11888EJ3V0DS00
7
PC2794GS
STANDARD CHARACTERISTICS (by application circuit example)
CG, NF vs. fRF 40 VCC = 9 V fIF = 45 MHz PRF = -30 dBm 30 20 VCC = 9 V fIF = 45 MHz 10 fRF = 802 MHz Pout vs. Pin
CG - Conversion Gain - dB NF - Noise Figure - dB
Pout - Output Power - dBm
20
0
fRF = 362 MHz
10
-10 VCC = 9 V fIF = 45 MHz
0 0
200
400
600
800
1 000
-20 -40
-30
-20
-10
0
10
fRF - Input Frequency - MHz
Pin - Input Power - dBm
CM vs. fRF 110 20 10
CM - 1 % Cross Modulation Distortion - dB Pout - Output Power - dBm
6 Channel Beat
0 -10 -20 -30 -40 -50 -60 VCC = 9 V fP = 83.25 MHz fS = 87.75 MHz fOSC = 129 MHz -30 -20 -10 0 Pin - Input Power - dBm
100
90 VCC = 9 V fundes = fRF + 6 MHz fIF = 45 MHz PRF = -30 dBm 80 0 200 400 600 800 1 000
-70 -40
fRF - Input Frequency - MHz
Vtu vs. fOSC 30 25
Vtu - Tuning Voltage - V
20 15 10 5 0 0
VL
VH
U
200
400
600
800
1 000
fOSC - OSC Frequency - MHz
8
Data Sheet P11888EJ3V0DS00
PC2794GS
INPUT IMPEDANCE (by measurement circuit 5)

1 45 MHz 931.31 -247.16 2 200 MHz 358.08 -395.55 3 470 MHz 95.062 -184.34
3
1 2
START STOP
0.045000000 GHz 0.500000000 GHz

1 400 MHz 71.531 -178.98 2 600 MHz 31.352 -96.094 3 890 MHz 10.85 -42.965
1 3 2
START STOP
0.400000000 GHz 1.000000000 GHz
Data Sheet P11888EJ3V0DS00
9
PC2794GS
OUTPUT IMPEDANCE (by measurement circuit 5)

1 45 MHz 28.862 13.361
1
START STOP
0.045000000 GHz 0.065000000 GHz
10
Data Sheet P11888EJ3V0DS00
PC2794GS
MEASUREMENT CIRCUIT 1
OPEN
OPEN 1000 pF 20T 27 pF
VCC(9V)
OPEN 1000 1000 pF pF 1000 pF
1000 pF
1000 pF
1000 pF
20
19
18
17
16
15
14
13
12
11
REG
1
2
3
4 1000 pF
5
6
7
8 1000 pF
9
10
1000 pF
1000 pF 5pin Voltage OPEN VHF UHF OPEN 9V
1000 pF OPEN UB(9V)
1000 pF OPEN
MEASUREMENT CIRCUIT 2
SG1
VHF UHF 1000 pF 1000 pF 1000 pF 1000 pF 20T 27 pF 1000 pF 1000 pF 1000 pF
Spectrum Analyzer
20
19
18
17
16
15
14
13
12
11
REG
1
2
3
4 1000 pF
5
6
7
8
9
10 5pin Voltage 1000 pF VHF UHF VHF SG2 UHF OPEN 9V
1000 pF
1000 pF 1000 pF OPEN
1000 pF
Data Sheet P11888EJ3V0DS00
11
PC2794GS
MEASUREMENT CIRCUIT 3
Noise Meter VCC(9V) Noise Source VHF UHF 1000 pF 1000 pF 1000 pF 1000 pF 20T 27 pF BPF 1000 1000 pF pF 1000 pF
20
19
18
17
16
15
14
13
12
11
REG
1
2
3
4
5
6
7
8
9
10
1000 pF 1000 pF
1000 pF 1000 pF OPEN UB(9V)
1000 pF
5pin Voltage VHF UHF VHF SG1 UHF OPEN 9V
MEASUREMENT CIRCUIT 4
VHF UHF SG1 desire SG2 undesire 1000 pF 1000 pF 1000 pF 1000 pF 20T 27 pF 1000 1000 pF pF 1000 pF
MIX PAD
Spectrum Analyzer
20
19
18
17
16
15
14
13
12
11
REG
1
2
3
4
5
6
7
8
9
10 5pin Voltage 1000 pF VHF UHF VHF SG3 UHF OPEN 9V
1000 pF 1000 pF
1000 pF 1000 pF OPEN
12
Data Sheet P11888EJ3V0DS00
PC2794GS
MEASUREMENT CIRCUIT 5
Network Analyzer VCC(9V) 1000 pF 1000 pF 1000 pF 1000 pF 1000 pF 1000 pF 1000 pF
20
19
18
17
16
15
14
13
12
11
REG
1
2
3
4
5
6
7
8 1000 pF
9
10
1000 pF 1000 pF OPEN UB(9V)
1000 pF OPEN
1000 pF 5pin Voltage OPEN VHF UHF OPEN 9V
Data Sheet P11888EJ3V0DS00
13
PC2794GS
APPLICATION CIRCUIT EXAMPLE
URF IN 1 000 pF 1 000 pF
VRF IN 1 000 pF
1 000 pF
VCC 20T 27pF
IF OUT 1 000 pF
1 000 pF
1 000 pF
20
19
18
17
16
15
14
13
12
11
REG.
1
4 pF 1 pF 360 pF
2
3 pF 6 pF 8 pF
3
1 pF
4
5
6
7
8
9
10
3 pF 75 1T363 x 2 47 k 4T 82 pF 1 000 pF HB 47 k 7T 1 000 pF LB
10 pF 200 pF 1 000 pF 1 000 pF 47 k
360 pF 47 k 2T
Vtu
47 k
0.5 pF 1T363
OSC OUT Vtu UB
47 k
1 000 pF
2.7 k
The application circuits and their parameters are for reference only and are not intended for use in actual design-ins.
14
Data Sheet P11888EJ3V0DS00
PC2794GS
ILLUSTRATION OF THE EVALUATION BOARD FOR APPLICATION CIRCUIT EXAMPLE (Surface)
1000p
1
A
ULO IN
URF IN
VRF IN
PC2794GS
OSC OUT
VLO IN
IF OUT
B
Data Sheet P11888EJ3V0DS00
15
PC2794GS
ILLUSTRATION OF THE EVALUATION BOARD FOR APPLICATION CIRCUIT EXAMPLE (Back side)
Vtu A B
1000p
1000p
1000p 4p 1p 3p 1p 360p 6p,8p 47k 360p 1T363
0.5p 2T
47k
1000p
UB
20T
27p 1000p
VCC 10p 1T363x2 3p 47k 82p 1000p 47k 7T 4T
1000p
200p 75 47k
2.7k 1000p 1000p 47k 1000p 1000p

represents cutout represents short-circuit strip LB HB
16
Data Sheet P11888EJ3V0DS00
PC2794GS
PACKAGE DIMENSIONS
20 PIN PLASTIC SOP (300 mil) (UNIT: mm)
20
11 detail of lead end
3 +7 -3 1 12.70.3 7.70.3 1.550.1 5.60.2 1.1 10
1.27 0.40.1 0.10.1 1.8 MAX. 0.12
M
0.78 MAX. 0.10
0.60.2 0.20 -0.05
+0.10
NOTE Each lead centerline is located within 0.12 mm of its true position (T.P.) at maximum material condition.
Data Sheet P11888EJ3V0DS00
17
PC2794GS
NOTE ON CORRECT USE
(1) Observe precautions for handling because of electro-static sensitive devices. (2) Form a ground pattern as widely as possible to minimize ground impedance (to prevent undesires oscillation). (3) Keep the track length of the ground pins as short as possible. (4) A low pass filter must be attached to VCC line. (5) A matching circuit must be externally attached to output port.
RECOMMENDED SOLDERING CONDITIONS
The following conditions (see table below) must be met when soldering this product. Please consult with our sales officers in case other soldering process is used or in case soldering is done under different conditions. For details of recommended soldering conditions for surface mounting, refer to information document SEMICONDUCTOR DEVICE MOUNTING TECHNOLOGY MANUAL (C10535E).
PC2794GS
Soldering Process Infrared ray reflow Soldering Conditions Peak package's surface temperature: 235 C or below, Reflow time: 30 seconds or below (210 C or higher), Number of reflow process: 3, Exposure limit*1: None Peak package's surface temperature: 215 C or below, Reflow time: 40 seconds or below (200 C or higher), Number of reflow process: 3, Exposure limit*1: None Partial heating method Terminal temperature: 300 C or below, Flow time: 3 seconds or below, Exposure limit*1: None Symbol IR35-00-3
VPS
VP15-00-3
*1
Exposure limit before soldering after dry-pack package is opened. Storage conditions: 25 C and relative humidity at 65 % or less.
Caution Do not apply more than single process at once, except for "Partial heating method".
18
Data Sheet P11888EJ3V0DS00
PC2794GS
[MEMO]
Data Sheet P11888EJ3V0DS00
19
PC2794GS
NESAT (NEC Silicon Advanced Technology) is a trademark of NEC Corporation. * The information in this document is subject to change without notice. Before using this document, please confirm that this is the latest version. * No part of this document may be copied or reproduced in any form or by any means without the prior written consent of NEC Corporation. NEC Corporation assumes no responsibility for any errors which may appear in this document. * NEC Corporation does not assume any liability for infringement of patents, copyrights or other intellectual property rights of third parties by or arising from use of a device described herein or any other liability arising from use of such device. No license, either express, implied or otherwise, is granted under any patents, copyrights or other intellectual property rights of NEC Corporation or others. * Descriptions of circuits, software, and other related information in this document are provided for illustrative purposes in semiconductor product operation and application examples. The incorporation of these circuits, software, and information in the design of the customer's equipment shall be done under the full responsibility of the customer. NEC Corporation assumes no responsibility for any losses incurred by the customer or third parties arising from the use of these circuits, software, and information. * While NEC Corporation has been making continuous effort to enhance the reliability of its semiconductor devices, the possibility of defects cannot be eliminated entirely. To minimize risks of damage or injury to persons or property arising from a defect in an NEC semiconductor device, customers must incorporate sufficient safety measures in its design, such as redundancy, fire-containment, and anti-failure features. * NEC devices are classified into the following three quality grades: "Standard", "Special", and "Specific". The Specific quality grade applies only to devices developed based on a customer designated "quality assurance program" for a specific application. The recommended applications of a device depend on its quality grade, as indicated below. Customers must check the quality grade of each device before using it in a particular application. Standard: Computers, office equipment, communications equipment, test and measurement equipment, audio and visual equipment, home electronic appliances, machine tools, personal electronic equipment and industrial robots Special: Transportation equipment (automobiles, trains, ships, etc.), traffic control systems, anti-disaster systems, anti-crime systems, safety equipment and medical equipment (not specifically designed for life support) Specific: Aircraft, aerospace equipment, submersible repeaters, nuclear reactor control systems, life support systems or medical equipment for life support, etc. The quality grade of NEC devices is "Standard" unless otherwise specified in NEC's Data Sheets or Data Books. If customers intend to use NEC devices for applications other than those specified for Standard quality grade, they should contact an NEC sales representative in advance.
M7 98.8

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