Sony CXA3107N Datasheet

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E96303A8Z

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.

Absolute Maximum Ratings (Ta=25 °C)

• Supply voltage VCC 7.0 V

• Operating temperature Topr –20 to +75 °C

• Storage temperature Tstg –65 to +150 °C

Operating Condition

Supply voltage VCC 1.1 to 4.0 V

Description

The CXA3107N is a low current consumption FM IF amplifier which employs the newest bipolar process. It is suitable for M-ary FSK pagers.

Features

• Low current consumption: 570 µA

(typ. at VCC=1.4 V)

• Low voltage operation: VCC=1.1 to 4.0 V

• Small package 20-pin SSOP

• Needless of IF decoupling capacitor

• Reference power supply for operational amplifier

and comparator

• Bit rate filter with variable cut-off

• Misoperation prevention function for continuous

data

• RSSI function

• IF input, Vcc standard

Applications

• M-ary FSK pagers

Function

Plastic

Structure

Bipolar silicon monolithic IC

IF Amplifier for M-ary FSK Pagers

20 pin SSOP (Plastic)

CXA3107N

For the availability of this product, please contact the sales office.

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CXA3107N

VCC

REG

OUT

REG

CONT

CHARGE RSSI

DISKGNDIF IN

REGULATOR

LIM FILTER

QUAD

DET

QUICK

CHARGE

ALARM

LEVEL

COMP

111213141516171820 19

NRZ

COMP

LVA

NRZ

OUT

FIL

LEVEL

CONT

FSK

REF

CHG

CONT

C1 C2 C3 AUDIO

1 2 3 4 5 6 7 8 9 10

Block Diagram

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CXA3107N

Pin Description

Symbol Pin voltage Equivalent circuit Description

No.

IF IN

GND

TH CONT

FSK REF

DISK

CHG OFF

1.4 V

—

0.2 V

1.4 V

—

IF limiter amplifier input.

Ground. Determines the level

comparator threshold value. The threshold value can be adjusted by inserting the resistor between Pin 3 and VCC. Normally, short to VCC.

Connects the capacitor that determines the low cut-off frequency for the entire system.

Connects the phase shifter of FM detector circuit.

Sets off the quick charge circuit current. The charge current is off by setting Pin 15 low and Pin 6 high.

VCC

1.5k

GND

1.5k

20k 20k

VCC

GND

25k

VCC

GND

VCC

22k

GND

20p

20k

GND

72k

100k

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CXA3107N

Symbol Pin voltage Equivalent circuit Description

No.

7 8 9

11 16 17

C1 C2 C3

AUDIO

LEVEL NRZ OUT LVA OUT

RSSI

FIL SW

0.2 V

— — —

0.1 V

—

Connects the capacitor that determines the LPF cut-off.

Level comparator and NRZ comparator inputs. The operational amplifier output is connected.

Level comparator, NRZ comparator and LVA comparator outputs. They are open collectors. (Applied voltage range:

–0.5 V to +7.0 V)

RSSI circuit output.

Switches the LPF cut-off. Cut-off is decreased by setting this pin high. (Applied voltage range:

–0.5 V to +7.0 V)

VCC

GND

35k

50k

8 9

VCC

GND

VCC

GND

7k 7k

70k

20k

GND

140k

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CXA3107N

Symbol Pin voltage Equivalent circuit Description

No.

B.S.

CHARGE

REG CONT

REG OUT

VCC

—

1.0 V

Controls the battery saving. Setting this pin low suspends the operation of IC. (Applied voltage range:

–0.5 V to +7.0 V)

Controls the charge speed of the quick charge circuit. Set this pin high to execute the quick charge. (Applied voltage range:

–0.5 V to +7.0 V)

Output for internal constantvoltage source amplifier. Connects the base of PNP transistor. (Current capacity: 100 µA)

Constant-voltage source output. Controlled to maintain 1.0 V.

Power supply.

20k

GND

140k

20k

100k

GND

VCC

GND

VCC

GND

78k

22k

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CXA3107N

Electrical Characteristics (VCC=1.4 V, Ta=25 °C, FS=455 kHz, FMOD=1.6 kHz, FDEV=4.8 kHz, AMMOD=30 %)

Item

Current consumption

AM rejection ratio

NRZ output saturation voltage

NRZ output leak current

NRZ hysteresis width

VB output current

VB output saturation current

REG OUT voltage

LVA operating voltage

LVA output leak current

LVA output saturation voltage

Detector output voltage

Logic input voltage high level

Logic input voltage low level

Limiting sensitivity Detector output level ratio deviation

to level comparator window width Level comparator output saturation voltage

Level comparator output leak current

RSSI output offset

IF limiter input resistance

Symbol

ICC

ICCS

AMRR

VSATNRZ

ILNRZ

VTWNRZ

IOUT

VSATVB

VREG

VLVA

ILLVA

VSATLVA

VODET

VTHBSV

VTLBSV

VIN (LIM)

VLCWR

VSATLC

ILLC

VORSSI

RINLIM

Conditions Measurement circuit 1 V2=1.0 V Measurement circuit 1 V2=0 V Measurement circuit 2 30 k LPF Measurement circuit 4 Vin=0.3 V Measurement circuit 3 Vin=0.1 V Measurement circuit 3 Vin=0.1 to 0.3 V

Measurement circuit 5

Output current 0 µA Measurement circuit 6

V1=1.4 to 1.0 V Measurement circuit 6 1=1.0 V

Measurement circuit 7

Measurement circuit 2

—

Measurement circuit 2, data filter fc=2.4 kHz

—

Measurement circuit 9

Measurement circuit 8

Measurement circuit 10

—

Min. Typ. Max. Unit

390 570 780 µA

— 6 20 µA

25 — — dB

— — 0.4 V

— — 5.0 µA

5 10 20 mV

100 — — µA

— — 0.4 V

0.92 0.96 1.02 V

1.00 1.05 1.10 V

— — 5.0 µA

— — 0.4 V

50 63 80 mVrms

0.9 — — V

— — 0.35 V

— –83 — dBm

–15 0 +15 %

— — 0.4 V

— — 5.0 µA

— 100 250 mV

1.2 1.5 1.8 kΩ

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