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Fast Buffer
CORPORATION
LH0033 / LH0033C
FEATURES 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/s 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 50 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 LH0033G LH0033CG CONNECTION DIAGRAM
LH0033 Metal Can Package NC NC NC 4 INPUT 5 6 OFFSET PRESET OFFSET ADJUST 7 8 9 VC 3 2 1
12
* Slew rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1500V/s * Wide range single or dual supply operation .... . . . . . 100MHz * Bandwidth .drive .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. . .10V. .with. 50 load * High output * Low phase non-linearity . . . . . . . . . . . . . . . . 2 degrees ......... . * Rise times resistance:.. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. . 103ns 10 * High input High output current (peak) . . . . . . . . . . . . . . . . . 250mA *
Driver * Coaxial CableBooster * Fast Op Amp * Flash Converter Driver Line * VideoSpeedDriver and Hold Sample * High * ATE Pin Driver * Video Amplifier * Radar * Sonar * Boost OP Amp Output * Isolate Capacitance Load
APPLICATIONS
Package H12A (TO8 12 Lead) H12A (TO8 12 Lead)
Temperature Range -55oC to 125oC -25oC to 85oC
VC+ V+
11 10
OUTPUT
V-
NC Top View
Case is electrically Isolated Package H12A
CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-1076
LH0033 / LH0033C
CORPORATION
ABSOLUTE MAXIMUM RATINGS If Military/Aerospace specified devices are required, please contact Calogic Sales Office for availability and specifications. Supply Voltage (V+ - V-). . . . . . . . . . . . . . . . . . . . . . . . . . . 40V Power Dissipation (See Curves) LH0033/LH0033C . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.2W Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . 175oC Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . VSupply Continuous Output Current LH0033/LH0033C . . . . . . . . . . . . . . . . . . . . . . . . . 100mA Peak Output Current LH0033/LH0033C . . . . . . . . . . . . . . . . . . . . . . . . . 250mA Lead Temp. (Soldering, 10 seconds). . . . . . . . . . . . . . . 300oC Operating Temperature Range LH0033. . . . . . . . . . . . . . . . . . . . . . . . . . . . -55oC to +125oC LH0033C . . . . . . . . . . . . . . . . . . . . . . . . . . . -25oC to +85oC Storage Temperature Range . . . . . . . . . . -65oC to +150oC
DC ELECTRICAL CHARACTERISTICS: The following specifications apply for supply voltage = 15V unless otherwise noted (Note 1)
SYMBOL CHARACTERISTICS MIN VOS VOS T Output Offset Voltage Average Temperature Coefficient of Offset Voltage LH0033 TYP 5.0 MAX 10 15 100 MIN LH0033C TYP 12 MAX 20 25 100 mV mV V/ oC RS = 100, TJ = 25oC, VIN = 0V (Note 2), RS = 100 RS = 100, VIN = 0V (Note 3) VIN = 0V TJ = 25 oC (Note 2) TA = 25oC (Note 4) TJ = TA = T MAX VO = 10V, RS = 100, RL = 1.0k RL = 1k VIN = 1.0V, RL = 1.0k VI = 14V, RL = 1.0k VI = 10.5V, RL = 100, TA = 25oC VIN = 0V (Note 5) VIN = 0V UNITS CONDITIONS
50
50
IB
Input Bias Current
250 2.5 10 0.97 10
10
500 5.0 20 0.96 10
10
pA nA nA V/V
AV RIN ROUT V(SWING 1) V(SWING 2) IS PD
Voltage Gain Input Impedance Output Impedance Output Voltage Swing Supply Current Power Consumption
0.98 10
11
1.00
0.98 10
11
1.00
6.0 12 9.0 18 540
10 12 9.0 22 660
6.0
10
V
18 540
24 720
mA mW
AC ELECTRICAL CHARACTERISTICS: TJ = 25oC, VS = 15V, RS = 50, RL = 1.0K (Note 3)
SYMBOL SR BW CHARACTERISTICS MIN Slew Rate Bandwidth Phase Non- Linearity RT Rise Time Propagation Delay Harmonic Distortion 1000 LH0033 TYP 1500 100 2.0 2.9 1.2 <0.1
o
LH0033C MAX MIN 1000 TYP 1400 100 2.0 3.2 1.5 <0.1 MAX
UNITS V/s MHz degrees ns ns %
CONDITIONS VIN = 10V VIN = 1.0Vrms BW = 1.0Hz to 20MHz VIN = 0.5V VIN = 0.5V f>1kHz
Note 1: LH0033 is 100% production tested as specified at 25 C. Specifications at temperature extremes are verified by sample testing, correlation or periodic characterization. Note 2: Specification is at 25oC junction temperature due to requirements of high speed automatic testing. Actual values at operating temperature will exceed the value at TJ = 25oC. When supply voltages are 15V, no-load operating junction temperature may rise 40-60oC above ambient, and more under load conditions. Accordingly, VOS may change one to several mV, and IB will change significantly during warm-up. Note 3: Limits are guaranteed by sample testing, periodic characterization or correlation. Note 4: Measured in still air 7 minutes after application of power. Guaranteed through correlated automatic pulse testing. Note 5: Guaranteed through correlated automatic pulse testing at TJ = 25oC.
CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-1076
LH0033 / LH0033C
CORPORATION
TYPICAL PERFORMANCE CHARACTERISTICS
POWER DISSIPATION
21 2.0
POWER DISSIPATION (W)
SUPPLY CURRENT vs SUPPLY VOLTAGE
CASE JC = 60C/W 1.5
SUPPLY CURRENT (mA)
20
19
1.0 AMBIENT JA = 100C/W 0.5
TC = +125C TC = +25C TC = -55C
18
0 0 25 50 75 100 125 150 TEMPERATURE (C)
17 5 10 15 20 SUPPLY VOLTAGE (V)
OUTPUT VOLTAGE vs SUPPLY VOLTAGE
18 16
OUTPUT VOLTAGE (V) INPUT/OUTPUT VOLTAGE (-V)
NEGATIVE PULSE RESPONSE
VS = 15V 0 -2 -4 INPUT -6 OUTPUT -8 -10 -12 0 10 20 30 TIME (ns) 40 50 60 RS = 50 RL = 1k TC = +25C
14 12 10 8 6 4 5
RL = 1k RS = 100k TC = +25C
10
15
20
SUPPLY VOLTAGE (V)
POSITIVE PULSE RESPONSE
INPUT/OUTPUT VOLTAGE (V)
FREQUENCY RESPONSE
VS = 15V
VOLTAGE GAIN (V/V)
12 10 8 6 4
VS = 15V RL = 1k, RS = 50 TC = +25C
40 35
PHASE LAG (DEGREES)
RS = 50 RL = 1k VIN = 1.0 Vrms 1.0 0.8 0.6 0.4 0.2 Av
30 25 20 15 10 5 100
INPUT OUTPUT
2 0 0 10 20 30 TIME (ns) 40 50 60
1.0
2.0
5.0
10.0 20.0
50
FREQUENCY (MHz)
CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-1076
LH0033 / LH0033C
CORPORATION
TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
RISE AND FALL TIME vs TEMPERATURE
8.0
RISE AND FALL TIME (ns)
INPUT BIAS CURRENT vs TEMPERATURE
10
INPUT BIAS CURRENT (nA)
VS = 15V RS = 50 RL = 1k tf
VS = 10V 1 VS = 15V 0.100 VS = 5V 0.010
6.0
4.0 tr 2.0
0 -50
0.001 0 50 100 150 0 25 50 75 100 125 TEMPERATURE (C) TEMPERATURE (C)
NORMALIZED INPUT BIAS CURRENT DURING WARM-UP
100
INPUT BIAS CURRENT (nA) CURRENT - NORMALIZED TO CURRENT AT TIME = 0
INPUT BIAS CURRENT vs INPUT VOLTAGE
10 VS = 15V PULSE TESTED (TJ = 25C) 1.0
VS = 15V TA = 25C
10
0.1
1 0 2 4 6 8 10 10 8 6 4 2 0 -2 -6 -10 TIME FROM POWER TURN-ON (MINUTES) INPUT VOLTAGE (V)
CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-1076
LH0033 / LH0033C
CORPORATION
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 200 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-) = 0.005 (V+ -V-) 2 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 value resistors between V+ and VC+ pins and V - and VC- pins as illustrated in Figure 2. Resistor values may be predicted by: RLIM 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 V+
ISC
=
V- ISC
FIGURE 1. Offset Zero Adjust
FIGURE 2. Resistor Current Limiting Using Resistor
V+
R LIM
+15V INPUT OFFSET PRESET (OPEN) OFFSET ADJUST 200 -15V 5 1 12 LH0033 10 7 9
100
12
11 OUTPUT
C 0.1F 1
6
INPUT
5
LH0033 9 10 7 6
11
OUTPUT
R LIM 100
C 0.1F
V-
CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-1076
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: VBE 0.6V RLIM = = = 10 ISC 60mA 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 x dV/d t ) should be limited below absolute maximum peak current ratings for the devices. Thus for the LH0033: ( VIN ) x CL IOUT 250mA t
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 47 should 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 0.1F in parallel; adding a 4.7F solid tantalum capacitor will help troublsome instances.
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 - ) x IS + PAC PAC (Vp-p)2 x f x CL
FIGURE 3. Current Limiting Using Current Sources
+15V R LIM 10 Q2 12 Q1 5 1 LH0033 9 10 7 6 Q3 Q1 = Q2 = 2N2905 Q3 = Q4 = 2N2219 R LIM 10 -15V Q4 30k 0.01F 11
INPUT
OUTPUT
CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-1076
LH0033 / LH0033C
CORPORATION
TYPICAL APPLICATIONS High Input Impedance AC Coupled Amplifier
V+
4.7pF
12 0.001F INPUT 5 LH0033
CASE 11 9 10 7 0.1F
OUTPUT
6
0.1F
Vf H 100MHz
1M
Coaxial Cable Driver
V+
12 51 INPUT
C1* 100 1 11 9 10 6 100 50 43
5
LH0033
7
V*Select C1 for Optimum Pulse Response
CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-1076
LH0033 / LH0033C
CORPORATION
TYPICAL APPLICATIONS (Continued) High Input Impedance Comparator with Offset Adjust Instrumentation Shield/Line Driver
VU.L. V+ 3 -
V+ 10
V+
12 4 +
INPUT
5
LH0033 10 7
1 11 9 7 -
12
LM711
100 1
CASE 11 9
51 INPUT
5
LH0033 10
6 OFFSET ADJUST VVL.L.
+
5 VNO GO = LOGIC "1" GO = LOGIC "0"
7 6
100
V-
Single Supply AC Amplifier
4.5MHz Notch Filter
VCC = 12.0V
C1 150pF C1 150pF V+
12 1 0.001F INPUT 5 LH0033
CASE 11 9 10
VIN
12 R2 110 5 1 LH0033 9 10 C2 300pF 7 6 f0 = 1 2 R1C1 11
OUTPUT
1M
7 6
R1 220
R1 = 2R2 C1 = VC2 2
R1 220
CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-1076
LH0033 / LH0033C
CORPORATION
TYPICAL APPLICATIONS (Continued) High Speed Sample and Hold
V+
V+
7
100
1 11
12 100
ANALOG INPUT
5
LH0033 10
5
1 LH0033
11
OUTPUT
9
10 100 C1* 1000pF
9 6 7
6 7
VV-
*Polycarbonate or TeflonTM
LOGIC INPUT
1 2
CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-1076

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