Monolithic Linear LA7790M QPSK Transmitter Cable Overvi

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Monolithic Linear LA7790M QPSK Transmitter Cable Overvi

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Ordering number EN5689A
Monolithic Linear
LA7790M
QPSK Transmitter Cable
Overview
LA7790M QPSK data transmitter digital cable applications. integrating quadrature modulator, amplifier, electronic volume control, mute control, other functions onto single chip, parts count reduced size miniaturized.
Varactor diode-based Muting Electronic volume control Power-saving modes Switchable output frequency range Power supply voltage (4.5
Features
Maximum amplifier output level terminator), suitable directly driving cable. output frequency range MHz. Frequency range selection function permits broadband designs. Electronic volume control direct-current control output level. Muting ensures ample attenuation during periods with transmission. Support both internal external bias modulation inputs. Support modulation frequencies MHz. (typ: mVp-p)
Package Dimensions
unit: 3108-MFP24D
[LA7790M]
Functions
quadrature modulator input bias power supply amplifier
SANYO: MFP24D
Allowable power dissipation, Pdmax (mW)
Ambient temperature, (°C)
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, Chome, Ueno, Taito-ku, TOKYO, JAPAN
5061998RM (OT) 5689-1/14
LA7790M
Specifications
Maximum Ratings 25°C
Parameter Maximum power supply voltage Circuit voltage Circuit current Allowable power dissipation Operating ambient temperature Storage temperature Symbol Vmax Topr Tstg Pins Pins Output lead-in current 54°C Conditions Ratings +150 Unit
Recommended Conditions 25°C
Parameter Operating power supply voltage Symbol Pins Conditions Ratings Unit
Operating Characteristics 25°C,
Parameter Current drain Circuit current Circuit current Modulator f(V19) Output frequency range Output signal level Output harmonic distortion f(V19) V19(DSB) V19(HD2) V19(HD3) Output secondary harmonic distortion Output tertiary harmonic distortion Carrier suppression ratio Sideband suppression ratio input level input level input voltage input voltage Reference voltage Variable attenuator Minimum gain control voltage Gain range Modulator output impedance Oscillator frequency range output level output impedance Band switch Band switch level f(V19) Band switch level f(V19) 12.5 V17H V17L Note VCC, GND, Note VCC, GND, f(osc) V11(fo) VCC, GND, VCC, GND, VCC, GND, mVp-p V19(GR) VCC, GND, Note GND, VCC, VCC, GND, V19(2fo) V19(3fo) V19(fo) V19(SSB) V4.5 V8.9 Note GND, VCC, Note GND, VCC, Note GND, VCC, Note GND, VCC, Note GND, VCC, Note GND, VCC, V4.5 V8.9 External bias voltage External bias voltage Internal bias voltage mVp-p mVp-p With signal, With signal, pins Symbol Conditions Ratings Unit
Continued next page.
5689-2/14
LA7790M
Continued from preceding page.
Parameter Band switch level f(V11) Band switch level f(V11) 12.5 output amplifier Maximum output level V1(HD2) V1(HD3) Muting Muting voltage Muting voltage Muting attenuation Power save function Power save voltage Power save voltage Power save current V20H V20L Note V23H V23L V1(mute) VCC, GND, VCC, GND, Note VCC, GND, Note VCC, GND, dBm, Note VCC, GND, dBm, Symbol V12H V12L Conditions Note VCC, GND, Note VCC, GND, Ratings Unit
Maximum output distortion
Assignment
5689-3/14
LA7790M Note Input: mVp-p, Signal mVp-p, Signal Output: Note Input: Same Note Output:
Note Input: Same Note Output:
Note Input: mVp-p Output:
Note Input: mVp-p, 0deg mVp-p, 90deg Output:
Note Input: mVp-p Output:
5689-4/14
LA7790M Note Input: mVp-p Output:
Note Input: Output:
Note Input: mVp-p Output:
Note current when (power save on).
5689-5/14
Gain control
Measurement Circuit
Mute Power save Band switch
Divider
LA7790M
Divider
Voltage reference
Band switch2
5689-6/14
Gain control Mute
Sample Application Circuit
Power save Band switch
LA7790M
Divider
Divider
Voltage reference
Band switch2
5689-7/14
LA7790M Modulator modulator consists identical multiplier circuits, creating channels. Pins pins channel inputs, respectively. These pins must biased internal bias. This internal bias used data inputs coupled, external bias must used case coupled data inputs. Carrier suppression improved offset voltages between pins pins small. coupled application
input
input
coupled application
input
input
5689-8/14
LA7790M Equivalent circuit modulator block
from Divider
bias
from Divider
I-INPUT
Q-INPUT
Unit (resistance
5689-9/14
LA7790M Attenuator attenuator input signal comes from modulator output high pass filter MHz). modulator output connected emitter emitter follower through resistor. emitter sink current about increased addition external resistor between ground. minimum value external resistor output level adjusted using connected base emitter follower through resistor. When base current about Equivalent circuit attenuator block
Gain control Control Circuit
output
From Modulator
Unit (resistance
Amplifier amplifier input signal comes from attenuator output after harmonics removed LPF. amplifier composed two-stage amplifier includes mute power save functions. gain amplifier adjusted using external input resistor connected external load resistor connected input must coupled. output must connected choke coil. (mute control) (power save control) both high impedance inputs (base current less than µA). normal operation, voltage pins must less than Mute Power Save operation, voltage pins must between VCC-1 VCC.
5689-10/14
LA7790M Equivalent circuit amplifier block
Choke Coil Vout Mute output Load resistor
from stage
input
Mute
stage
stage
Power save
Power save Amplifier Gain Input Resistor
gain amplifier adjusted changing value
Unit (resistance
5689-11/14
LA7790M Oscillator oscillator signal divided either supplied modulator switching signals. division mode selected using Band Switch (pin 17). High Modulation frequency oscillator frequency Modulation frequency oscillator frequency oscillator requires external coil capacitors. Pins should coupled using coil. coil with greater required impedance between pins value coupling capacitors between pins pins must large enough that signal phase rotation small. Equivalent circuit oscillator block
Unit (resistance
5689-12/14
LA7790M Oscillator Output output frequency oscillator equal half output frequency modulator. mode using Band Switch (pin 12). High Oscillator output frequency modulator frequency Oscillator output frequency modulator frequency Band Swtich input circuitry Band Switch (pin Band Switch (pin same. setting requires voltage less than pin. high setting requires voltage between VCC-1 pin. Settings high generate currents pins High Sink current Source current Equivalent circuit output band switch blocks
from Divider from Divider
Band switch2
OUTPUT
input circuitry band switch same.
Unit (resistance
5689-13/14
LA7790M Digital Circuit correct 0°/90° phase switching signal modulator, divide-by-four dual flip-flop employed shown following figure. Band Switch usded expand range modulation frequency. Band Switch used select frequency output external PLL.
Mudulator 90deg 0deg
Band switch
Band switch2
output
products described contained herein intended surgical implants, life-support systems, aerospace equipment, nuclear power control systems, vehicles, disaster/crime-prevention equipment like, failure which directly indirectly cause injury, death property loss. Anyone purchasing products described contained herein above-mentioned shall: Accept full responsibility indemnify defend SANYO ELECTRIC CO., LTD., affiliates, subsidiaries distributors their officers employees, jointly severally, against claims litigation damages, cost expenses associated with such use: impose responsibility fault negligence which cited such claim litigation SANYO ELECTRIC CO., LTD., affiliates, subsidiaries distributors their officers employees jointly severally. 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 May, 1998. Specifications information herein subject change without notice. 5689-14/14

Monolithic Linear LA7790M QPSK Transmitter Cable Overvi

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