Sanyo LA7770 Specifications

Any and all SANYO products described or contained herein do not have specifications that can handle
applications that require extremely high levels of reliability, such as life-support systems, aircraft’s
control systems, or other applications whose failure can be reasonably expected to result in serious
physical and/or material damage. Consult with your SANYO representative nearest you before using
any SANYO products described or contained herein in such applications.

SANYO assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges,or other
parameters) listed in products specifications of any and all SANYO products described or contained
herein.

Monolithic Linear IC

FSK Receiver for CATV Use

Ordering number:ENN2208A

LA7770

SANYO Electric Co.,Ltd. Semiconductor Company

TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN

Overview

The LA7770 is a CATV-oriented wide-band FSK (fre­quency shift keying) receiv er IC encapsulated in a DIP20S
package that incorporates the functions required to demodu­late scramble decoding data (i. e., the oscillator, mixer, lim-

iting IF amplifier, squelcher, and data shaper functions).

Features

• High limiting sensitivity.

• Incorporating a common-collector oscillator enables LC,
crystal, or SAW-R (surface acoustic wave resonator) op­erated oscillations, as required by application.

Functions

• Mixer.

• Limiting IF amplifier.

• Squelch meter drive.

• Oscillator.

• Quadrature detector.

• Data shaper.

Specifications

Maximum Ratings at Ta = 25˚C

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egatlovylppusmumixaM

tnerructuo-wolfmumixaMI

noitapissidrewopelbawollAxamdP 077Wm

erutarepmetgnitarepOrpoT 58+ot02–

erutarepmetegarotSgtsT 521+ot55–

V
V

xam4 51V

CC

xam6 51V

CC

xam 3Am

81

Ta≤65˚C

Package Dimensions

unit:mm

3021C-DIP20

[LA7770]

24.0

20

1

1.0

(0.57)

2.54

0.5

1.2

11

7.62

10

(3.25)

3.9max

3.3

0.51min

SANYO : DIP20

6.4

0.25

˚C
˚C

Operating Conditions at Ta = 25˚C

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egnaregatlovgnitarepO

egnaregatlovtupnirotarapmoC91V,61V V(otV2

VCC4 21ot9V
VCC6 21ot9V

13101TN (KT)/O0695TH (KOTO)/D088MO/O127TA, TS No.2208–1/7

)V2–V

CC

LA7770

Operating Characteristics at Ta = 25˚C

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tnerructiucriCI

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ecnatsisertupnirexiMirzHM001086

niagegatlovrexiMmgVRL003= Ω M5.601, → M7.0192151Bd

ytivitisnesgnitimilBd3–iV

N/SN/S

noitrotsidcinomrahlatoTDHT

tuptuonoitaludomeDoV

noitcejerMARMAzHk1ta%03:MA7455Bd

evirdreteMI

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tnerructupnirepahsataDI

egatlovnoitarutastuptuOV

ytuD|DT|zHk41=f5.20.5%

CC

D

HT41

61

no-QS0.325.030.93Am

∆

F

∆

F

∆

F

∆

F

Aµ003 → Aµ00652102Bd/Aµ
CD8.05.12.2V
CD7.00.3Aµ

I

)tas(81

Am2=1.07.0V

81

zHk1ta,vedzHk57±=
zHk1ta,vedzHk57±=
zHk1ta,vedzHk57±=
zHk1ta,vedzHk57±=

nimpytxam

Equivalent Circuit Block Diagram

sgnitaR

5213Vµ/Bd

7455Bd

6.02%

003044006smrVm

tinU

Ω

No.2208–2/7

LA7770

LA7770 Dynamic Behavior and Cautions on Designing

(1) Mixer

A double differential type mixer is employd with its input circuit configured as shown in Fig. 1, where the input
signal is mixed with the oscillator output by its double differential circuit.
The mixed signal will be output from its open collector pin 5.

Fig. 1

Caution
a. Since an internal bias is applied to the input pin (pin 20), be

sure to provide a DC blocking capacitor as shown in Fig. 2.

b. Connect the decoupling capacitor across pins 4 and 1 with the

shortest possible wiring.

Fig. 2

(2) Oscillator

A common-collector oscillator is employed as shown in Fig. 3, and enables the LC, crystal, or SAW-R operated
oscillations.

Fig. 3

No.2208–3/7