Sony CXA1744AR Datasheet

CXA1744AR

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IF Amplifier for Digital Cordless Telephone

Description

The CXA1744AR is an IF amplifier IC designed for

digital cordless telephone of Europe, CT-2.

Features

• Mixer, RSSI, detector, and various other functions

required of a digital cordless phone IF amplifier.

• Local oscillator and multiplier for the mixer.

• Low power consumption (8.4mA at 3.0V)

• Small package (48-pin LQFP).

Absolute Maximum Ratings (Ta=25°C)

• Supply voltage VCC 14 V

• Operating temperature Topr –20 to +75 °C

• Storage temperature Tstg –65 to +150 °C

• Allowable power dissipation PD 500 mW

Structure

Bipolar silicon monolithic IC

Applications

Digital cordless telephone of Europe (CT-2)

48 pin LQFP (Plastic)

Recommended Operating Condition

• Supply voltage VCC 2.7 to 5.5 V

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.

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E93Z33-TE

Block Diagram and Pin Configuration

CC

CXA1744AR

MIXOUT

MIXIN2

MIXIN1

BUFPAS

LOIN

REF

NC

MULTIOUT

NC

OSCC

OSCB

37

38

39

40

41

42

43

44

45

46

47

48

MIXV

MIX

MULTI

OSC

IFP1

IFIN

IFP2

IF

SAMPLE

IFOUT

OPAMPCOMP1

RSSIVcc

RSSIOST

RSSI

REG

IFCNT

LIMP1

LIM

DET

LIMIN

SAMPLE

LIMP2

252627282930313233343536

COMP2

RSSIGND

COMP3

LIMOUT

24

QDIN

23

RSSIOST

22

RSSIOUT

21

REGOUT1

20

CC

V

19

FCOMPIN

18

FCOMPINX

17

FCOMPOUT

16

VREF

15

CURREF

14

GND

13

1 2 3 4 5 6 7 8 9

PSX

MIXGND

DCOMPINX

DCOMPOUT

OPOUT

DCOMPIN

OPINX

OPIN

10 11 12

DETOUT

ICOMPIN

ICOMPINX

ICOMPOUT

—2—

Pin Description

CXA1744AR

Pin Typical pin No. voltage

Symbol Equivalent circuit Description

1 MIXGND 0V

2 PSX 0V

3 DCOMPOUT —

4 DCOMPINX —

5 DCOMPIN

GND for the MIX, OSC, and MULTI circuits.

VCC

Power save control. Power save mode for Low; power

32k

2

32k

GND

VCC

3

GND

VCC

4 5

129

save function executes on all circuits except the OSC circuit and a part of the REG circuit.

Data slicer comparator output.

Data slicer comparator input. DCOMPINX is for out-of-phase input. DCOMPIN is for in-phase input.

6 OPOUT —

7 OPINX —

8 OPIN

9 DETOUT 1.25V

GND

VCC

6

GND

VCC

Operational amplifier output.

Operational amplifier input. OPINX is for out-of-phase input.

7

129

8

GND

VCC

9

OPIN is for in-phase input.

Detector output.

—3—

GND

CXA1744AR

Pin Typical pin No. voltage

Symbol Equivalent circuit Description

10 ICOMPIN —

11 ICOMPINX

12 ICOMPOUT —

13 GND 0V

14 CURREF 1.25V

15 VREF 1.9V

VCC

Sample-and-hold circuit input. ICOMPIN is for in-phase input.

10

11

12

129

CC

V

GND

ICOMPINX is for out-of-phase input.

Sample-and-hold circuit output.

GND for circuits other than the MIX, OSC, MULTI, and RSSI circuits.

V

CC

Adjustment for RSSI output current. Connects a resistor between this pin

129

14

1.25V GND

VCC

and GND.

Reference voltage. Leave this pin open normally.

15

16 FCOMPOUT —

17 FCOMPINX —

18 FCOMPIN

16

1.25V

GND

VCC

Comparator output for free-channel detection.

GND

VCC

129

17

129

18

GND

Comparator input for free-channel detection. FCOMPINX is for out-of-phase input. FCOMPIN is for in-phase input.

—4—

CXA1744AR

Pin Typical pin

No. voltage

Symbol Equivalent circuit Description

19 VCC 3.0V

20 REGOUT1 1.25V

21 RSSIOUT —

22 RSSIOST 1.25V

20

22

21

129

VCC

1.25V

GND

RSSIVCC

GND

RSSIVCC

1.9V

Power supply for circuits other than the MIX, OSC, MULTI, and RSSI circuits. Internal bias regulator output. A stabilized bias voltage can be obtained.

RSSI current output. A voltage output is obtained when a resistor is connected between this pin and GND.

RSSI offset adjustment. The offset amount of RSSI output current can be adjusted by connecting a resistor between this pin and GND.

23 QDIN 2.45V

24 LIMOUT 1.55V

25 RSSIGND 0V

RSSIVCC

32k

23

129

GND

RSSIVCC

24

GND

Detector input. Connect a detection discriminator.

Limiter output.

GND for the IF amplifier, limiter and RSSI circuits.

—5—

CXA1744AR

Pin Typical pin

No. voltage

Symbol Equivalent circuit Description

26 LIMP2 1.5V

27 LIMIN

28 LIMP1

29 IFCNT 0.6V

30 RSSIVCC 2.45V

31 IFOUT 1.55V

28

27

26

29

30

129

460

1.9V

+

RSSIV

50k

GND

RSSIVCC

GND

V

1.25V

GND

RSSIVCC

CC

Limiter input. Input the signal from IF amplifier to LIMIN. Connect a decoupling capacitor to LIMP1 and LIMP2.

IF amplifier gain adjustment. Connect a resistor between this pin and GND to compensate for the interstage filter insertion loss between the IF amplifier and limiter.

Power supply for the IF amplifier, limiter and RSSI circuits. Connected to the regulator output internally. Connect a decoupling capacitor.

IF amplifier output.

32 SAMPLE 3.0V

33 IFP2 1.55V

34 IFIN

35 IFP1

36 MIXVCC 3.0V

35

34

33

31

420

GND

VCC

50k

Sample-and-hold circuit control input. Sample mode for open or High; hold mode for Low.

10k

32

GND

RSSIV

50k

CC

IF amplifier input. Input the signal from MIX to IFIN. Connect a decoupling capacitor to IFP1 and

330

50k

GND

IFP2.

Power supply for the MIX, OSC, and MULTI circuits.

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