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| Ordering number : ENN8268 LA7795T Overview www..com Monolithic Linear IC AGC Amplifier with Step Gain Control The LA7795T bipolar monolithic IC is an AGC amplifier with driver amplifier for analog-to-digital converters. It is ideally suited for use with receiver systems that receive QPSK and/or QAM data transmissions. Functions * IF AGC control * IF AGC amplifier * IF step gain controlled amplifier * Driver amplifier Applications * Digital CATV * Cable modem receivers * IP Telephony receivers Specitications Absolute Maximum Ratings at Ta = 25 C Parameter Maximum Supply Voltage Circuit Voltages Circuit Current Allowable Power Dissipation Operating Temperature Storage Temperature Symbol VCC max V max I6 I7 Pd max Topr Tstg Pin 1 Pin 4, Pin 5 Pin 6 sink current Pin 7 sink current Ta 85C Conditions Ratings 7.0 VCC op 2 2 190* -20 to +85 -55 to +150 Unit V V mA mW C C *Mounted on PCB (paper phenol 20.0 x 10.0 x 0.8 t mm) Recommended Operating Conditions at Ta = 25 C Parameter Recommended Supply Voltage Operating Supply Voltage Range Symbol VCC VCC op Pin 1 Pin 1 Conditions Ratings 5.0 4.5 to 5. 5 Unit V V 33005 TN PC No.8268-1/8 LA7795T Electrical Characteristics AC Characteristics at Ta = 25 C, VCC = 5.0 V Parameter Circuit Current IF Input Frequency Range Noise Figure Symbol Itotal f(in) NF Pin No. 1 2, 3 6, 7 No Signal fc : -3 dB V4 = 3.0 V, f = 45 MHz V4 = 3.0 V, f = 45 MHz V4 = 3.0 V, f = 45 MHz Intermodulation Total Amplifier Gain IM3 G(AGC1) G(AGC2) 6/2, 3 7/2, 3 6/2, 3 7/2, 3 f1 = 44 MHz, f2 = 45 MHz Input = 90 dB/Tone, Output = 104 dB/Tone V4 = 3.0 V, f = 45 MHz V4 = 3.0 V, f = 45 MHz V4 = 3.0 V, f = 45 MHz 6/2, 3 7/2, 3 IF Output Level AGC Control Max. Voltage AGC Control Min. Voltage Input impedance VO(IF) V4H V4L Zin 6, 7 4 4 2, 3 Output Level, f = 45 MHz Gain Max. Gain Min. V4 = 0 V, f = 45 MHz *1 *1 *1 *3 2.5 0 1.0 1 // 4.9 3.3 0.5 Vp-p V V k // pF Pin 5 : VCC Pin 5 : GND Pin 5 : OPEN *1 *1 *1 *1 57.5 47.5 33.5 40 60 50 36 62.5 52.5 38.5 dB dB dB dB Pin 5 : VCC Pin 5 : GND Pin 5 : OPEN Conditions min *1 *1 *2 *2 *2 *1 18 30 50 Ratings typ 24 5 5 8 max 30 100 mA MHz dB dB dB dBc Unit www..com AGC Range 1 G(AGC3) GR1 IF Output Level < 1 dB, f = 45 MHz Note) *1 : Measurement circuit 1, *2 : Measurement circuit 2, *3 : Measurement circuit 3 Package Dimensions unit : mm 3245A [LA7795T] Block Diagram VCC 1 8 Gnd IF Input1 2 7 Driver Output1 IF Input2 3 AGC 6 Driver Output2 AGC Control 4 5 Gain Control Switch No.8268-2/8 LA7795T Pin Functions Pin Number 1 2 3 Pin Name VCC IF Input Descriptions Bias 1k 2 3 1k www..com 4 AGC Control VCC 1k 4 5 Gain Control Switch VCC 80k 10k 5 6 7 Driver Output VCC 20 6 20 7 5.0mA 5.0mA 8 GND No.8268-3/8 LA7795T LA7795T Gain Measurement Circuit 1 VCC 1000pF TOKO 617DB-1010 B4F 1 8 200 SG SG 2 1000pF 7 1000pF 200 51 Spectrum Analyzer 3 1000pF 6 1000pF AGC 4 AGC Voltage 1000pF 5 1000pF VCC SW www..com LA7795T Noise Figure Measurement Circuit 2 VCC 1000pF TOKO 617DB-1010 B4F 1000pF 1 8 200 Noise Figure Analyzer (Source) 2 7 1000pF 200 Noise Figure Analyzer (Sense) 51 3 1000pF 6 1000pF AGC 4 AGC Voltage 1000pF 5 1000pF VCC SW LA7795T Input Impedance Measurement Circuit 3 VCC 1000pF 1 8 200 51 Network Analyzer 1000pF 51 2 7 1000pF 200 51 3 1000pF 6 1000pF AGC 4 AGC Voltage 1000pF 5 1000pF VCC SW LA7795T Intermodulation Measurement Circuit 4 VCC 1000pF TOKO Input 617DB-1010 B4F 1000pF 1 8 200 SG SG 2 7 1000pF 200 Output Spectrum Analyzer 51 3 1000pF 6 1000pF AGC 4 AGC Voltage 1000pF 5 1000pF VCC SW No.8268-4/8 LA7795T Gain - Vagc Characteristic 70 60 50 40 Noise Figure - Gain Characteristic 40 35 30 VCC = 5.0 V Frequency = 45 MHz Circuit1 PIN5:VCC PIN5:GND PIN5:OPEN Noise Figure - dB VCC = 5.0 V Frequency = 45 MHz Circuit2 Voltage Gain - dB 30 20 10 0 -10 -20 -30 -40 -0.5 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 25 20 P IN 15 10 5 0 10 C 5:V C PIN PIN 5:O PE N N 5:G D 15 20 25 30 35 40 45 50 55 60 65 70 www..com 70 Vagc - V Voltage Gain - dB Gain - Frequency Characteristic VCC = 5.0 V, Vagc = 2.5 V Circuit2 60 PIN5:VCC PIN5:GND 50 Voltage Gain - dB 40 PIN5:OPEN 30 20 10 0 10 20 30 40 50 60 70 80 90 100 Frequency - MHz Intermodulation Characteristic 0 -10 -20 Intermodulation Characteristic 3.0 0 -10 -20 2.7 2.4 2.1 1.8 1.5 1.2 Output / Tone - dBm -30 -40 -50 -60 -70 -80 -90 Vagc - V Output / Tone - dBm VCC = 5.0 V, PIN5 : OPEN Frequency = 44 MHz, 45 MHz, Circuit4 Vagc t tpu Ou Va gc Output -30 -40 -50 -60 -70 -80 -90 VCC = 5.0 V, PIN5 : GND Frequency = 44 MHz, 45 MHz, Circuit4 Vagc t tpu Ou 3.0 Output 2.7 2.4 2.1 Vag c 1.5 1.2 IM3 0.9 0.6 0.3 IM3 0.9 0.6 0.3 -100 -70 -65 -60 -55 -50 -45 -40 -35 -30 -25 -20 0 -15 -100 -70 -65 -60 -55 -50 -45 -40 -35 -30 -25 -20 0 -15 Input / Tone - dBm Input / Tone - dBm 3.0 2.7 2.4 2.1 Intermodulation Characteristic 0 -10 -20 VCC = 5.0 V, PIN5 : VCC Frequency = 44 MHz, 45 MHz, Circuit4 Output Output / Tone - dBm -30 -40 -50 -60 -70 -80 -90 -100 -70 -65 -60 -55 -50 -45 -40 -35 -30 -25 -20 Vag c 1.5 1.2 0.9 0.6 0.3 0 -15 Vagc - V 1.8 The vertical axis (Output/Tone) on this graph shows the values displayed by the spectrum analyzer for circuit 4. The actual output power for the corresponding pins is given by the following formula. {output power [dBm]}= {displayed value [dBm]}+10 log (250 /50 ) IM3 Input / Tone - dBm No.8268-5/8 Vagc - V 1.8 LA7795T Gain - Vagc Characteristic 70 60 50 40 Gain - Vagc Characteristic 70 60 50 40 VCC = 5.0 V PIN5 : OPEN, Frequency = 45 MHz Circuit1 Voltage Gain - dB VCC = 5.0 V PIN5 : GND, Frequency = 45 MHz Circuit1 Voltage Gain - dB 30 20 10 30 20 10 0 -10 -20 25 0 -10 -20 -30 -40 -0.5 0 85 -30 -40 -0.5 0 -20 -2 0 0.5 1.0 85 25 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 1.5 2.0 2.5 3.0 3.5 4.0 www..com 70 60 50 40 Vagc - V Vagc - V Gain - Vagc Characteristic VCC = 5.0 V PIN5 : VCC, Frequency = 45 MHz Circuit1 Voltage Gain - dB 30 20 10 0 -10 -20 -30 -40 -0.5 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 85 -2 0 25 Vagc - V Noise Figure - Gain Characteristic 40 35 30 Noise Figure - Gain Characteristic 40 35 30 PIN5 : OPEN, Circuit2 PIN5 : GND, Circuit2 85 Noise Figure - dB 25 20 15 10 5 0 10 -2 0 Noise Figure - dB 25 25 20 15 10 5 0 10 85 -20 25 15 20 25 30 35 40 45 50 55 60 65 70 15 20 25 30 35 40 45 50 55 60 65 70 Voltage Gain - dB Voltage Gain - dB Noise Figure - Gain Characteristic 40 35 30 PIN5 : VCC, Circuit2 Noise Figure - dB 25 20 15 10 5 0 10 85 - 20 25 15 20 25 30 35 40 45 50 55 60 65 70 Voltage Gain - dB No.8268-6/8 LA7795T Gain - Frequency Characteristic 70 65 60 Gain - Frequency Characteristic 70 65 60 VCC = 5.0 V PIN5 : OPEN Vagc = 2.5 V Circuit1 Voltage Gain - dB VCC = 5.0 V PIN5 : GND Vagc = 2.5 V Circuit1 -20 85 25 Voltage Gain - dB 55 50 45 40 35 30 25 20 10 20 30 40 50 60 70 80 90 100 55 50 45 40 35 30 25 20 10 20 30 40 50 60 70 80 90 100 -20 85 25 www..com 70 65 60 Frequency - MHz Frequency - MHz Gain - Frequency Characteristic 25 -20 85 Voltage Gain - dB 55 50 45 40 35 30 25 20 10 VCC = 5.0 V PIN5 : VCC Vagc = 2.5 V Circuit1 20 30 40 50 60 70 80 90 100 Frequency - MHz Intermodulation Characteristic 0 -10 -20 Intermodulation Characteristic 0 VCC = 5.0 V, PIN5 : OPEN Frequency = 44 MHz, 45 MHz, Circuit4 25 Output -10 -20 VCC = 5.0 V, PIN5 : GND Frequency = 44 MHz, 45 MHz, Circuit4 -20 85 25 Output Output / Tone - dBm -30 -40 -50 -60 -70 -80 -90 -100 -70 -65 Output / Tone - dBm -20 85 -20 -30 -40 -50 -60 -70 -80 -90 25 IM3 85 -20 25 85 IM3 -60 -55 -50 -45 -40 -35 -30 -25 -20 -15 -100 -70 -65 -60 -55 -50 -45 -40 -35 -30 -25 -20 -15 Input / Tone - dBm Input / Tone - dBm Intermodulation Characteristic 0 -10 -20 VCC = 5.0 V, PIN5 : VCC Frequency = 44 MHz, 45 MHz, Circuit4 -20 25 85 Output Output / Tone - dBm -30 -40 -50 -60 -70 -80 -90 -100 -70 -20 25 The vertical axis (Output/Tone) on this graph shows the values displayed by the spectrum analyzer for circuit 4. The actual output power for the corresponding pins is given by the following formula. {output power [dBm]}= {displayed value [dBm]}+10 log (250 /50 ) 85 IM3 -65 -60 -55 -50 -45 -40 -35 -30 -25 -20 -15 Input / Tone - dBm No.8268-7/8 LA7795T www..com n Specifications of any and all SANYO products described or contained herein stipulate the performance, characteristics, and functions of the described products in the independent state, and are not guarantees of the performance, characteristics, and functions of the described products as mounted in the customer's products or equipment. To verify symptoms and states that cannot be evaluated in an independent device, the customer should always evaluate and test devices mounted in the customer's products or equipment. n SANYO Electric Co., Ltd. strives to supply high-quality high-reliability products. However, any and all semiconductor products fail with some probability. It is possible that these probabilistic failures could give rise to accidents or events that could endanger human lives, that could give rise to smoke or fire, or that could cause damage to other property. When designing equipment, adopt safety measures so that these kinds of accidents or events cannot occur. Such measures include but are not limited to protective circuits and error prevention circuits for safe design, redundant design, and structural design. n In the event that any or all SANYO products (including technical data, services) described or contained herein are controlled under any of applicable local export control laws and regulations, such products must not be exported without obtaining the export license from the authorities concerned in accordance with the above law. n No part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying and recording, or any information storage or retrieval system, of otherwise, without the prior written permission of SANYO Electric Co., Ltd. n Any and all information described or contained herein are subject to change without notice due to product/technology improvement, etc. When designing equipment, refer to the "Delivery Specification" for the SANYO product that you intend to use. n Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use or any infringements of intellectual property rights or other rights of third parties. This catalog provides information as of March, 2005. Specifications and information herein are subject to change without notice. PS No.8268-8/8 |
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