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LT1719CS8 Datasheet(PDF) 11 Page - Linear Technology |
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LT1719CS8 Datasheet(HTML) 11 Page - Linear Technology |
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11 / 16 page  11 LT1719 APPLICATIONS INFORMATION 5V 5V 180 Ω DO NOT USE FOR LT1719 LEVEL TRANSLATION. SEE TEXT 270 Ω 820 Ω 10KH/E R2 +VS R3 R1 10KH/E 100K/E +VS 5V OR 5.2V 4.5V R1 510 Ω 620 Ω R2 180 Ω 180 Ω R3 750 Ω 510 Ω (a) STANDARD TTL TO PECL TRANSLATOR (b) LT1719 OUTPUT TO PECL TRANSLATOR LSTTL LT1719 VEE VCC VEE VCC R2 VECL 3V R3 R4 R1 10KH/E 100K/E VECL 5V OR 5.2V 4.5V R1 300 Ω 330 Ω R2 180 Ω 180 Ω R3 OMIT 1500 Ω (c) 3V LT1719 OUTPUT TO PECL TRANSLATOR LT1719 R4 560 Ω 1000 Ω R4 VECL +VS VCC VEE R3 1719 F06 R2 R1 ECL FAMILY 10KH/E VECL – 5.2V R1 560 Ω 270 Ω +VS 5V 3V R2 270 Ω 510 Ω R3 330 Ω 300 Ω (d) LT1719 OUTPUT TO STANDARD ECL TRANSLATOR LT1719 R4 1200 Ω 330 Ω 100K/E – 4.5V 680 Ω 330 Ω 5V 3V 270 Ω 390 Ω 300 Ω 270 Ω 1500 Ω 430 Ω Figure 6 evaluated carefully. Note that there is some degradation of noise margin due to the ±5% resistor selections shown. With 10KH/E, there is no temperature compensation of the logic levels, whereas the LT1719 and the circuits shown give levels that are stable with temperature. This will lower the noise margin over temperature. In some configura- tions it is possible to add compensation with diode or transistor junctions in series with the resistors of these networks. For more information on ECL design, refer to the ECLiPS data book (DL140), the 10KH system design handbook (HB205) and PECL design (AN1406), all from Motorola. Circuit Description The block diagram of the LT1719 is shown in Figure 7. The circuit topology consists of a differential input stage, a gain stage with hysteresis and a complementary com- mon-emitter output stage. All of the internal signal paths utilize low voltage swings for high speed at low power. The input stage topology maximizes the input dynamic range available without requiring the power, complexity and die area of two complete input stages such as are found in rail-to-rail input comparators. With a single 2.7V supply, the LT1719 still has a respectable 1.6V of input |
Similar Part No. - LT1719CS8 |
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Similar Description - LT1719CS8 |
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