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LH0033C Schematic ( PDF Datasheet ) - Calogic LLC

Teilenummer LH0033C
Beschreibung Fast Buffer
Hersteller Calogic LLC
Logo Calogic  LLC Logo 




Gesamt 9 Seiten
LH0033C Datasheet, Funktion
CORPORATION
Fast Buffer
LH0033 / LH0033C
FEATURES
Slew rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1500V/µs
Wide range single or dual supply operation
Bandwidth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100MHz
•• High output drive . . . . . . . . . . . . . . . ±10V with 50load
Low phase non-linearity . . . . . . . . . . . . . . . . 2 degrees
Rise times . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3ns
•• High input resistance:. . . . . . . . . . . . . . . . . . . . . . . 1010
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 50coaxial
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






LH0033C Datasheet, Funktion
LH0033 / LH0033C
CORPORATION
Figure 3. In Figure 3, the current sources are saturated
during normal operation, thus apply full supply voltage to the
VC pins. Under fault conditions, the voltage decreases as
required by the overload.
For Figure 5:
RLIM
=
VBE
ISC
=
0.6V
60mA
=
10
Capacitive Loading
The LH0033 is designed to drive capacitive loads such as
coaxial cables in excess of several thousand picofarads
without susceptibility to oscillation. However, peak current
resulting from (C × dV/dt) should be limited below absolute
maximum peak current ratings for the devices.
Thus for the LH0033:
(
VIN
t
)
×
CL
IOUT
±250mA
In addition, power dissipation resulting from driving capacitive
loads plus standby power should be kept below total package
power rating:
PDpkg. PDC + PAC
PDpkg. (V+–V) × IS + PAC
PAC (Vp-p)2 × f × CL
where:
Vp-p = Peak-to-peak output voltage swing
f = Frequency
CL = Load Capacitance
Operation Within An Op Amp Loop
LH0033 may be used as a current booster or isolator buffer
within a closed loop with op amps such as LH0032, or
CLM4124. An isolation resistor of 47should be used between
the op amp output and the input of LH0033. The wide bandwidth
and high slew rate of the LH0033 assure that the loop has the
characteristics of the op amp and that additional rolloff is not
required.
Hardware
In order to utilize the full drive capabilities of LH0033, it should
be mounted with a heat sink particulary for extended
temperature operation. The case is isolated from the circuit
and may be connected to the system chassis.
Design Precaution
Power supply bypassing is necessary to prevent oscillation.
Low inductance ceramic disc capacitors with the shortest
practical lead lengths must be connected from each supply
lead (within <14" to 12" of the device package) to a ground
plane. Capacitors should be one or two 0.1µF in parallel;
adding a 4.7µF solid tantalum capacitor will help troublsome
instances.
FIGURE 3. Current Limiting Using Current Sources
+15V
INPUT
R LIM
10
Q2
12
Q1
5
LH0033
1
11
9
10
7
6
30k
OUTPUT
0.01µF
Q1 = Q2 = 2N2905
Q3 = Q4 = 2N2219
Q3
R LIM
10
Q4
-15V
CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-1076

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