PDF LH0033 Data sheet ( Hoja de datos )

Número de pieza	LH0033
Descripción	Fast Buffer
Fabricantes	Calogic LLC
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CORPORATION Fast Buffer LH0033 / LH0033C FEATURES • Slew rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1500V/µs Wide range single or dual supply operation • Bandwidth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100MHz •• High output drive . . . . . . . . . . . . . . . ±10V with 50Ω load Low phase non-linearity . . . . . . . . . . . . . . . . 2 degrees • Rise times . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3ns •• High input resistance:. . . . . . . . . . . . . . . . . . . . . . . 1010Ω • High output current (peak) . . . . . . . . . . . . . . . . . 250mA APPLICATIONS Coaxial Cable Driver • Fast Op Amp Booster • Flash Converter Driver • Video Line Driver • High Speed Sample and Hold • ATE Pin Driver • Video Amplifier • Radar • Sonar • Boost OP Amp Output •• Isolate Capacitance Load GENERAL DESCRIPTION The LH0033 is a high speed, FET input, voltage follower/buffer designed to provide high current drive (up to 100mA) at frequencies from DC to over 100MHz. The LH0033 slews at 1500V/µs and exhibits excellent phase linearity up to 20MHz. LH0033 is intended to fulfill a wide range of buffer applications such as high speed line drivers, video impedance transformation, nuclear instrumentation amplifiers, op amp isolation buffers for driving reactive loads and high impedance input buffers for high speed A to Ds and comparators. In addition, the LH0033 can continuously drive 50Ω coaxial cables or be used as a yoke driver for high resolution CRT displays. This device is constructed using specially selected junction FETs and active laser trimming to achieve guaranteed performance specifications. The LH0033 is specified for operation from -55oC to +125oC and the LH0033C is specified from -25oC to 85oC. The LH0033 is available in a 2.2W metal TO-8 package. ORDERING INFORMATION Part Package LH0033G H12A (TO8 12 Lead) LH0033CG H12A (TO8 12 Lead) Temperature Range -55oC to 125oC -25oC to 85oC CONNECTION DIAGRAM LH0033 Metal Can Package NC NC VC+ NC 3 2 1 V + 4 12 INPUT 5 11 OUTPUT OFFSET PRESET 6 10 789 OFFSET VC ADJUST NC Top View V- Case is electrically Isolated Package H12A CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-1076 1 page CORPORATION LH0033 / LH0033C APPLICATION INFORMATION: Recommended Layout Precautions RF/video printed circuit board layout rules should be followed when using the LH0033 since it will provide power gain to frequencies over 100MHz. Ground planes are recommended and power supplies should be decoupled at each device with low inductance capacitors. In addition, ground plane shielding may be extended to the metal case of the device since it is electrically isolated from internal circuitry. Alternatively the case should be connected to the output to minimize input capacitance. Offset Voltage Adjustment The LH0033’s offset voltages have been actively trimmed by laser to meet guaranteed specifications when the offset preset pin is shorted to the offset adjust pin. If offset null is desirable, it is simply obtained by leaving the offset preset pin open and connecting a trim pot of 200Ω for the LH0033 between the offset adjust pin and V–, as illustrated in Figure 1. Operation From Single Or Asymmetrical Power Supplies LH0033 may be used in applications where symmetrical supplies are unavailable or not desirable. A typical application might be an interface to a MOS shift register where V+ = +5V and V– = -12V. In this case, an apparent output offset occurs due to the device’s voltage gain of less than unity. This additional output error may be predicted by: ∆VO ≅ (1−AV) (V+−V−) 2 = 0.005 (V+ −V−) where: AV = No load voltage gain, typically 0.99 V+ = Positive supply voltage V– = Negative supply voltage For the above example, ∆VO would be -35mV. This may be adjusted to zero as described in Figure 1. For AC coupled applications, no additional offset occurs if the DC input is properly biased as illustrated in the Typical Applications section. Short Circuit Protection In order to optimize transient response and output swing, output current limit has been omitted from the LH0033. Short circuit protection may be added by inserting appropriate V– and VC– value resistors between V+ pins as illustrated in Figure and VC+ pins and 2. Resistor values may be predicted by: RLIM ≅ V+ ISC = V− ISC where: ISC ≤ 100mA for LH0033 The inclusion of limiting resistors in the collectors of the output transistors reduces output voltage swing. Decoupling VC+ and VC– pins with capacitors to ground will retain full output swing for transient pulses. Alternate active current limit techniques that retain full DC output swing are shown in FIGURE 1. Offset Zero Adjust FIGURE 2. Resistor Current Limiting Using Resistor V+ INPUT OFFSET PRESET (OPEN) OFFSET ADJUST 200Ω 51 6 LH0033 7 9 +15V 12 11 OUTPUT 10 -15V R LIM 100 INPUT 12 C ≅ 0.1µF 5 LH0033 1 11 9 10 7 6 R LIM 100 OUTPUT C ≅ 0.1µF V- CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-1076 5 Page

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