Sony CXA3275Q Datasheet

PLL/OSC/MIX IC for Digital Tuner

Description

The CXA3275Q is a monolithic tuner IC for single conversion system digital broadcast tuners. This IC integrates three sets of local oscillator and mixer circuits (VHF Low Band/ VHF High Band/UHF Band), an IF amplifier and a tuning PLL onto a single chip, enabling further miniaturization of the tuner.

Features

• Balanced oscillators with low-phase noise and

excellent oscillation stability (UHF: 4 pins, VHF: 2 pins)

• High linearity mixer and IF amplifier

• IF output switchable between balanced and

unbalanced

• Low-phase noise PLL synthesizer

(3-wire bus format)

• Reference frequency programmable in 4 bits

• On-chip high voltage drive transistor for charge

pump

• On-chip 4-output band switch (PNP transistor

on/off)

• 40-pin QFP package

Applications

Digital CATV tuners

Structure

Bipolar silicon monolithic IC

Absolute Maximum Ratings (Ta = 25°C)

• Supply voltage Vcc, PLLVcc –0.3 to +6.0 V

IFVcc –0.3 to +6.0 V

• Storage temperature Tstg –55 to +150 °C

• Allowable power dissipation PD 1.58 W

(when mounted on a printed circuit board)

Operating Conditions

• Supply voltage Vcc, PLLVcc 4.5 to 5.5 V

IFVcc 4.5 to 5.5 V

• Operating temperature Topr –40 to +80 °C

– 1 –

E00461-PS

Sony reserves the right to change products and specifications without prior notice. This information does not convey any license by any implication or otherwise under any patents or other right. Application circuits shown, if any, are typical examples illustrating the operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits.

CXA3275Q

40 pin QFP (Plastic)

This IC has pins whose electrostatic discharge strength is weak as a high-frequency process is used for this IC. Take care when handling the IC.

– 2 –

CXA3275Q

Block Diagram and Pin Configuration

VLMIX VHMIX UMIX

UOSC

VHOSCVLOSC

IF Amp

Ref OSC

Band SW

Charge Pump

Ref Div.

Lock Det

Program Div.

Phase Det

Bus Interface

1

2 3 4 5 6 7 8 9 10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

32

31

33

34

35

36

37

38

39

40

UIN2

Vcc

MIXOUT1

MIXOUT2

GND

IFIN1

IFIN2

RFGND

UOSCB1

UOSCE1

NC

BS4

BS3

BS2

BS1

VLIN1

VLIN2

VHIN1

VHIN2

UIN1

IFOUT1

IFOUT2

IFVcc

IFGND

VLOSC2

VLOSC1

VHOSC2

VHOSC1

UOSCB2

UOSCE2

PLLVcc

CP

VT

XI

XO

PLLGND

LOCK

SDA

SCL

CE

– 3 –

CXA3275Q

Pin Description and Equivalent Circuit

Pin No.

Symbol

Pin voltage

[V]

1

IFOUT1

2

3

IFOUT2

IFVcc

2.5

—

5

VLOSC2

6

VLOSC1

2.5

Equivalent circuit Description

IF outputs. IFOUT1 and IFOUT2 output a balanced signal. When taking a signal as an unbalanced output, connect the pin not used for output to IFVCC. At this time the output stage current is saved.

IF amplifier power supply.

4 IFGND

—

IF amplifier GND.

13

RFGND

—

Analog GND.

External resonance circuit connection for VL oscillator.

40k

IFVcc

3

1 2

20k

3k 3k

20k20k

Vcc

5

19

6

7

VHOSC2

8

VHOSC1

2.5

External resonance circuit connection for VH oscillator.

20k

3k 3k

20k20k

Vcc

7

19

8

12

UOSCB1

UHF: 2.2 VL/VH: 2.3

11

UOSCE1

UHF: 1.5 VL/VH: –

10

UOSCE2

UHF: 1.5 VL/VH: –

9

UOSCB2

UHF: 2.2 VL/VH: 2.3

External resonance circuit connection for UHF oscillator.

3k

Vcc

91910 11 12

– 4 –

CXA3275Q

14

IFIN2

15

IFIN1

2.7

17

MIXOUT2

18 MIXOUT1

—

IF inputs.

16 GND

0

GND

19

Vcc

—

Band switch, mixer and local oscillator circuit power supply.

Mixer outputs.

IFVcc

3

14 15

5k 5k

18 17

20 20

20

UIN2

21 UIN1

VL/VH: 0 UHF: 1.9

UHF inputs.

20

19

21

Vcc

25

VLIN1

VH: 3.16 VL: 3 UHF: 3.24

24

VLIN2

VH: 3.16 VL: 3 UHF: 3.24

23

VHIN1

VH: 3 VL: 3.16 UHF: 3.24

22

VHIN2

VH: 3 VL: 3.16 UHF: 3.24

VH and VL inputs.

Vcc

19

24 25

22 23

5k 5k

Pin No.

Symbol

Pin voltage

[V]

Equivalent circuit Description

– 5 –

CXA3275Q

26

BS1

29 BS4

ON: 4.9 OFF: 0

Pin 26: Band switch 1 output. Pin 29: Band switch 4 output.

The pin corresponding to the band selected by the data goes High.

20k

Vcc

19

26 29

27

BS2

28 BS3

ON: 4.9 OFF: 0

Pin 27: Band switch 2 output. Pin 28: Band switch 3 output.

The pin corresponding to the band selected by the data goes High.

20k

70k

30k

Vcc

19

27 28

32

CP

33

VT

—

Charge pump output. Connects the loop filter.

Transistor open collector output for varicap diode drive. Connects the loop filter.

50

33

32

31

PLLVcc

30 NC

—

NC.

31 PLLVcc

—

PLL VCC.

34

XI

35

XO

3.1

3.0

External reference clock input. Connects the crystal when used as a reference oscillator.

Connects the crystal when used as a reference oscillator.

PLLVcc

31

500

34 35

36 PLLGND

— PLL GND.

Pin No.

Symbol

Pin voltage

[V]

Equivalent circuit Description

– 6 –

CXA3275Q

37

LOCK

5.0

(lock)

0.2

(unlock)

Lock detection. High when locked, Low when

unlocked.

37

31

PLLVcc

38

SDA

—

Data input.

PLLVcc

20

5k

31

38

39

SCL

—

Clock input.

PLLVcc

5k

31

39

40

CE

1.25

(when open)

Enable pin.

PLLVcc

50k

150k

31

40

No.

Symbol

Pin voltage

[V]

Equivalent circuit Description

– 7 –

CXA3275Q

Electrical Characteristics (See the Electrical Characteristics Measurement Circuit.)

(Vcc = 5V, IFVcc = 5V, PLLVcc = 5V, Ta = 25°C)

Circuit Current

OSC/MIX/IF Amplifier Block

CG1-1 CG1-2 CG1-3 CG1-4 CG1-5 CG1-6 CG2-1 CG2-2 CG2-3 CG2-4 CG2-5 CG2-6 NF1 NF2 NF3 NF4 NF5 NF6

Conversion gain 1

∗1

(Unbalanced)

Conversion gain 2

∗

1, ∗2

(Balanced)

Noise figure

∗1, ∗3

(Unbalanced)

VL operation f

RF = 50MHz, fIF = 39MHz

VL operation fRF = 150MHz, fIF = 39MHz VH operation fRF = 150MHz, fIF = 39MHz VH operation fRF = 450MHz, fIF = 39MHz UHF operation fRF = 450MHz, fIF = 39MHz UHF operation fRF = 850MHz, fIF = 39MHz VL operation fRF = 50MHz, fIF = 39MHz VL operation fRF = 150MHz, fIF = 39MHz VH operation fRF = 150MHz, fIF = 39MHz VH operation fRF = 450MHz, fIF = 39MHz UHF operation fRF = 450MHz, fIF = 39MHz UHF operation fRF = 850MHz, fIF = 39MHz VL operation fRF = 50MHz, fIF = 39MHz VL operation fRF = 150MHz, fIF = 39MHz VH operation fRF = 150MHz, fIF = 39MHz VH operation fRF = 450MHz, fIF = 39MHz UHF operation fRF = 450MHz, fIF = 39MHz UHF operation fRF = 850MHz, fIF = 39MHz

18.5 19 19 19

23.5

24.5

25.5 26 26 26

30.5

31.5

21.5 22 22 22

26.5

27.5

28.5 29 29 29

33.5

34.5

15.5 15 15 15

10.5

25

25.5

25.5 30 31 32

32.5

32.5 37 38

18.5 18 18 18

13.5

dB dB dB dB dB dB dB dB dB dB dB dB dB dB dB dB dB dB

Symbol

Item

Measurement conditions Min. Typ. Max. Unit

Symbol

Item

Measurement conditions Min. Typ. Max. Unit

Iccv1

Iccu1

Iccv2

Iccu2

Circuit current

During VHF operation Unbalanced output Band switch output open

During UHF operation Unbalanced output Band switch output open

During VHF operation Balanced output Band switch output open

During UHF operation Balanced output Band switch output open

80

85

91

100

113

120

130

137

145

151

170

177

mA