Monolithic Linear LA7780M QPSK Downconverter CATV Systems

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Monolithic Linear LA7780M QPSK Downconverter CATV Systems

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Ordering number EN5268A
Monolithic Linear
LA7780M
QPSK Downconverter CATV Systems
Overview
LA7780M downconverter QPSK data demodulation digital CATV transmission. This integrates preamplifier, amplifier, mixer, oscillator, post-amplifier, other circuits single chip, provides functions required from cable signal input through output converter.
Functions
Preamplifier amplifier Mixer Oscillator Post amplifier (internal/external) detector
Features
Since preamplifier built LA7780M adequate sensitivity handle input signal from cable directly. (Input signal level:-30 dBm) Both internal external supported amplifier drive technique. output amplitude post amplifier used drive converter Vp-p (typical). Applications designed either crystal inductor oscillator.
Package Dimensions
unit: 3108-MFP24D
[LA7780M]
0.25
Specifications
Maximum Ratings 25°C
Parameter Maximum supply voltage Circuit voltage Symbol Circuit current Allowable power dissipation Operating temperature Storage temperature Topr Tstg Pins Pins output current sink current sink current 70°C Conditions
1.27
2.25
0.67
SANYO: MFP24D
Ratings +150
0.625
15.3
2.55max
10.5
Unit
SANYO products described contained herein have specifications that handle applications that require extremely high levels reliability, such life-support systems, aircraft's control systems, other applications whose failure reasonably expected result serious physical and/or material damage. Consult with your SANYO representative nearest before using SANYO products described contained herein such applications. SANYO assumes responsibility equipment failures that result from using products values that exceed, even momentarily, rated values (such maximum ratings, operating condition ranges, other parameters) listed products specifications SANYO products described contained herein.
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
D1698RM (OT) 5268-1/9
LA7780M Operating Conditions 25°C
Parameter Recommended supply voltage Operating supply voltage range Symbol Pins Pins Conditions Ratings Unit
Characteristics 25°C, internal mode, left open.
Parameter Circuit current input frequency range output level output output frequency bandwidth Local oscillator frequency range amplifier input sensitivity range flatness Preamplifier gain Maximum preamplifier output level Oscillator output level Symbol Itotal f(in) VO(IF) VO(IM3) f(LO) Vin(RF2) VO(IF) G(RF1) VOmax VO(OSC) Conditions Pins signal Pins Pins Pins output level Compare with state when (RF2) dBmV frequency that local oscillator Ratings 1000 Unit Vp-p dBmV dBmV mVp-p
Operating Modes
Mode Internal External (Narrow control range: External (Wide control range: (AGC divider inactive) Open (AGC divider active) With capacitor between ground With capacitor between ground With capacitor between ground Connected External voltage supply high impedance External voltage supply impedance
Internal
External
Note: internal mode, output level adjusted varying voltage.
Caution: Note Input: 69.55 MHz,
Other conditions: Internal mode left open. Output: post amplifier output (pin
Transfer ratio
5268-2/9
LA7780M
Note Input: 69.55 MHz, 70.55
Other conditions: Internal mode left open. Output: post amplifier output (pin
Point
dBmV (69.55 MHz) dBmV (70.55 MHz)
Note Post amplifier output level Remove low-pass filter between pins (Short coil remove capacitors pF.) Note Input: 69.55 Other conditions: Internal mode left open. Output: signal level such that post amplifier output (pin falls
Note MHz,
Note MHz, MHz, Adjust level until output Output:RF1-OUT (pin VO(IM3)
5268-3/9
LA7780M Assignment
view
Usage Notes oscillator stop power supply rise time extremely short. prevent this problem, insert resistor between ground between ground. (This applies when crystal oscillator used.) This should used with output level between Vp-p Vp-p. low-pass filter with 6-dB attenuation between pins Since high-frequency process adopted, care must taken prevent influence static electricity. Block Diagram
5268-4/9
LA7780M Descriptions
Function voltage Note Equivalent circuit
input
gain
Impedance connected must
output
Open collector
input input
Internal/external switch
(GND) (open)
Internal external (narrow control range) open External (wide control range)
filter filter
Open collector Open base (Pin GND) (Pin open)
switched
Continued next page.
5268-5/9
LA7780M
Continued from preceding page.
Function voltage Note Equivalent circuit
Post-amp output
Post-amp input
output
Oscillator input Oscillator input Oscillator input Oscillator input
Divider output
Output level adjustment
5268-6/9
LA7780M Test Circuit
5268-7/9
Sample Application Circuit
choke coil between pins required fundamental frequency crystal (not overtone) used.
LA7780M
5268-8/9
LA7780M
Specifications SANYO products described contained herein stipulate performance, characteristics, functions described products independent state, guarantees performance, characteristics, functions described products mounted customer's products equipment. verify symptoms states that cannot evaluated independent device, customer should always evaluate test devices mounted customer's products equipment. SANYO Electric Co., Ltd. strives supply high-quality high-reliability products. However, semiconductor products fail with some probability. possible that these probabilistic failures could give rise accidents events that could endanger human lives, that could give rise smoke fire, that could cause damage other property. When designing equipment, adopt safety measures that these kinds accidents events cannot occur. Such measures include limited protective circuits error prevention circuits safe design, redundant design, structural design. event that SANYO products (including technical data, services) described contained herein controlled under applicable local export control laws regulations, such products must exported without obtaining export license from authorities concerned accordance with above law. part this publication reproduced transmitted form means, electronic mechanical, including photocopying recording, information storage retrieval system, otherwise, without prior written permission SANYO Electric Co., Ltd. information described contained herein subject change without notice product/technology improvement, etc. When designing equipment, refer "Delivery Specification" SANYO product that intend use. Information (including circuit diagrams circuit parameters) herein example only; guaranteed volume production. SANYO believes information herein accurate reliable, guarantees made implied regarding infringements intellectual property rights other rights third parties.
This catalog provides information October, 1998. Specifications information herein subject change without notice. 5268-9/9

Monolithic Linear LA7780M QPSK Downconverter CATV Systems

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