NEC UPC2797GR Datasheet

DATA SHEET

BIPOLAR ANALOG INTEGRATED CIRCUIT

µ

PC2797GR

FREQUENCY DOWN CONVERTER FOR

VHF TO UHF BAND TV/VCR TUNER

DESCRIPTION

The µPC2797GR 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 SSOP (Shrink Small Outline Package) suitable for surface mounting.

FEATURES

• VHF to UHF bands operation.

• Low distortion CM: VHF (@fRF = 470 MHz) 96 dB

UHF (@fRF = 890 MHz) 92 dB

• Supply voltage : 9 V

• Packaged in 20-pin SSOP suitable for surface mounting

µ
µ

ORDERING INFORMATION

Part Number Package Package Style

µ

PC2797GR-E1 20-pin plastic SSOP (225 mil) Embossed tape 12 mm wide. 2.5 k/REEL.

Pin 1 indicates pull-out direction of tape

For evaluation sample order, please contact your local NEC office. (Part number for sample order: µPC2797GR)

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. P11889EJ3V0DS00 (3rd edition)
Date Published October 1999 N CP(K)
Printed in Japan

Caution electro-static sensitive device

The mark shows major revised points.

©

1996,1999

PIN CONFIGURATION (Top View)

µ

PC2797GR

1

10

INTERNAL BLOCK DIAGRAM

20 19 18 17 16 15 14 13 12 11

20

11

UHF OSC Collector

1.
UHF OSC Base

2.
UHF OSC Base

3.
UHF OSC Collector

4.
UB

5.
OSC OUTPUT

6.
GND

7.
VHF OSC Base

8.
VHF OSC Base

9.
VHF OSC Collector

10.
REG

11.
IF OUTPUT

12.
V

13.

CC

14.

MIX OUTPUT

15.

MIX OUTPUT

16.

VHF RF INPUT

17.

VHF RF INPUT

18.

GND

19.

UHF RF INPUT

20.

UHF RF INPUT

IF
Amp

(Tr. 1)
(Tr. 2)
(Tr. 1)
(Tr. 2)

(Tr. 1)
(Tr. 2)
(Tr. 1)

REG.

V OSCU OSC

12345678910

2

Data Sheet P11889EJ3V0DS00

PIN EXPLANATION

Pin Voltage TYP.

Pin No. Symbol

1 UOSC 6.90

collector Assemble LC resonator with 2
(Tr. 1)

2 UOSC 6.00

base (Tr.2) with balance amplifier. Connected

3

UOSC
base (Tr. 1)

4 UOSC 6.90

collector
(Tr. 2)

5 UB — Switching pin for VHF or UHF

6 OSC 5.85 UHF and VHF oscillator output

output pin. In case of F/S tuner

above: VHF mode
below: UHF mode

6.25

3.90

6.00

3.90

6.25

9.0

5.85

Function and Explanation Equivalent Circuit

Collector pin of UHF oscillator.

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

application, connected PLL
symthesizer IC’s input pin.
Grounded through 1.5 kΩ
resistor.

.

µ

PC2797GR

4 213

5

REG

6

1.5 k





from
OSC

7 GND 0.0 GND pin of VHF and UHF

0.0

8 VOSC 3.50 Base pin of VHF oscillator.

base Grounded through capacitor
(Tr. 1)

9 VOSC 3.50 Base pin of VHF oscillator.

base Assemble LC resonator with
(Tr. 2)

10 VOSC 6.20

collector
(Tr. 1)

5.90

5.90

6.90

oscillator.

10 pF.

10 pin to oscillate with active
feedback loop.

Collector pin of VHF oscillator.
Connected to LC resonator
through feedback capacitor ~ 3 pF.

* External element

8

~

10

9

REG

3Data Sheet P11889EJ3V0DS00

Pin Voltage TYP.

Pin No. Symbol

above: VHF mode

Function and Explanation Equivalent Circuit

below: UHF mode

11 REG 6.90 Monitor pin of regulator output

6.90

voltage.

12 IF output 2.80 IF output pin of VHF-UHF

band functions.

µ

PC2797GR

13

2.80

13 VCC 9.0 Power supply pin for VHF-

9.0

14 MIX 7.10

output1

7.05

15 MIX 7.10

output2

7.05

UHF band functions.
VHF and UHF MIX output pins

These pins should be
equipped with tank circuit to
adjust intermediate frequency.

16 VRF input 3.10 Bypass pin for VHF MIX input.

(bypass) Grounded through capacitor.

3.10

17 VRF input 3.10 VRF signal input pin from

antenna.

3.10

18 GND 0.0 GND pin of MIX, IF amplifier

and regulator.

0.0

12

.

14 15

13

from




VHF



17

OSC

16

13

14 15

19 URF input 3.10 Bypass pin for UHF MIX input.

(bypass) Grounded through capacitor.

3.10

20 URF input 3.10 URF signal input pin from

antenna.

3.10

4

Data Sheet P11889EJ3V0DS00

19

20

from




UHF



OSC

µ

PC2797GR

ABSOLUTE MAXIMUM RATINGS (TA = 25 °C unless otherwise specified)

Parameter Symbol Condition Rating Unit
Supply Voltage 1 VCC 11.0 V
Supply Voltage 2 UB 11.0 V
Power dissipation PD TA = 75 °C
Operating Ambient Temperature TA –40 to +75 °C
Storage temperature Tstg –60 to +150 °C

*1

500 mW

*1 Mounted on 50 × 50 × 1.6 mm double copper epoxy glass board.

RECOMMENDED OPERATING RANGE

Parameter Symbol MIN. TYP. MAX. Unit
Supply voltage 1 VCC 8.0 9.0 10.0 V
Supply voltage 2 UB 8.0 9.0 10.0 V
Operating Ambient Temperature TA –20 +25 +75 °C

5Data Sheet P11889EJ3V0DS00

µ

PC2797GR

ELECTRICAL CHARACTERISTICS (TA = 25 °C, VCC = 9 V, fIF = 45 MHz)

Parameter Symbol Test Conditions MIN. TYP. MAX. Unit
Circuit Current 1 ICC1 @VHF, no input signal
Circuit Current 2 ICC2 @UHF, no input signal
Conversion Gain 1 CG1 fRF = 55 MHz, PRF = –30 dBm 18.5 22.0 25.5 dB

POSC = –10 dBm

Conversion Gain 2 CG2 fRF = 200 MHz, PRF = –30 dBm 18.5 22.0 25.5 dB

POSC = –10 dBm

Conversion Gain 3 CG3 fRF = 470 MHz, PRF = –30 dBm 18.5 22.0 25.5 dB

POSC = –10 dBm

Conversion Gain 4 CG4 fRF = 470 MHz, PRF = –30 dBm 24.5 28.0 31.5 dB

POSC = –10 dBm

Conversion Gain 5 CG5 fRF = 890 MHz, PRF = –30 dBm 24.5 28.0 31.5 dB

POSC = –10 dBm
Noise Figure 1 NF1 fRF = 55 MHz, POSC = –10 dBm
Noise Figure 2 NF2 fRF = 200 MHz, POSC = –10 dBm
Noise Figure 3 NF3 fRF = 470 MHz, POSC = –10 dBm
Noise Figure 4 NF4 fRF = 470 MHz, POSC = 0 dBm
Noise Figure 5 NF5 fRF = 890 MHz, POSC = 0 dBm
Maximum Output Power 1 PO (sat)1fRF = 55 MHz, PRF = 0 dBm 7.0 10.0 — dBm

POSC = –10 dBm
Maximum Output Power 2 PO (sat)2fRF = 200 MHz, PRF = 0 dBm 7.0 10.0 — dBm

POSC = –10 dBm
Maximum Output Power 3 PO (sat)3fRF = 470 MHz, PRF = 0 dBm 7.0 10.0 — dBm

POSC = –10 dBm
Maximum Output Power 4 PO (sat)4fRF = 470 MHz, PRF = 0 dBm 7.0 10.0 — dBm

POSC = –10 dBm
Maximum Output Power 5 PO (sat)5fRF = 890 MHz, PRF = 0 dBm 7.0 10.0 — dBm

POSC = –10 dBm

*1, 2

*1, 2

31 38 45 mA
31 38 45 mA

*3

*3

*3

*3

*3

*4

— 11.0 14.0 dB

*4

— 11.0 14.0 dB

*4

— 11.0 14.0 dB

*4

— 9.5 12.5 dB

*4

— 10.0 13.0 dB

*3

*3

*3

*3

*3

*1 no resistance of OSC output
*2 By measurement circuit 1
*3 By measurement circuit 2
*4 By measurement circuit 3

6

Data Sheet P11889EJ3V0DS00