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PDF HFA1135 Data sheet ( Hoja de datos )
| Número de pieza | HFA1135 | |
| Descripción | 360MHz/ Low Power/ Video Operational Amplifier with Output Limiting | |
| Fabricantes | Intersil Corporation | |
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TM
Data Sheet
HFA1135
June 2000 File Number 3653.5
360MHz, Low Power, Video Operational
Amplifier with Output Limiting
The HFA1135 is a high speed, low power current feedback
amplifier build with Intersil’s proprietary complementary
bipolar UHF-1 process. This amplifier features user
programmable output limiting, via the VH and VL pins.
The HFA1135 is the ideal choice for high speed, low power
applications requiring output limiting (e.g. flash A/D drivers),
especially those requiring fast overdrive recovery times. The
limiting function allows the designer to set the maximum and
minimum output levels to protect downstream stages from
damage or input saturation. The sub-nanosecond overdrive
recovery time ensures a quick return to linear operation
following an overdrive condition.
Component and composite video systems also benefit from
this operational amplifier’s performance, as indicated by the
gain flatness, and differential gain and phase specifications.
The HFA1135 is a low power, high performance upgrade for
the CLC501 and CLC502.
Ordering Information
PART NUMBER
(BRAND)
HFA1135IB
(H1135I)
TEMP.
RANGE (oC)
PACKAGE
-40 to 85 8 Ld SOIC
PKG.
NO.
M8.15
HFA1135IB96
(H1135I)
HFA11XXEVAL
-40 to 85 8 Ld SOIC
Tape and Reel
M8.15
DIP Evaluation Board for High Speed
Op Amps
Features
• User Programmable Output Voltage Limiting
• Fast Overdrive Recovery . . . . . . . . . . . . . . . . . . . . . . <1ns
• Low Supply Current . . . . . . . . . . . . . . . . . . . . . . . . 6.8mA
• High Input Impedance . . . . . . . . . . . . . . . . . . . . . . . 2MΩ
• Wide -3dB Bandwidth. . . . . . . . . . . . . . . . . . . . . . 360MHz
• Very Fast Slew Rate . . . . . . . . . . . . . . . . . . . . . . 1200V/µs
• Gain Flatness (to 50MHz) . . . . . . . . . . . . . . . . . . ±0.07dB
• Differential Gain . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.02%
• Differential Phase . . . . . . . . . . . . . . . . . . . . 0.04 Degrees
• Pin Compatible Upgrade to CLC501 and CLC502
Applications
• Flash A/D Drivers
• High Resolution Monitors
• Professional Video Processing
• Video Digitizing Boards/Systems
• Multimedia Systems
• RGB Preamps
• Medical Imaging
• Hand Held and Miniaturized RF Equipment
• Battery Powered Communications
Pinout
HFA1135
(SOIC)
TOP VIEW
NC 1
-IN 2
+IN 3
V- 4
-
+
8 VH
7 V+
6 OUT
5 VL
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143 | Intersil and Design is a trademark of Intersil Corporation. | Copyright © Intersil Corporation 2000
1 page  
HFA1135
problems due to the feedback impedance decrease at higher
frequencies). At higher gains the amplifier is more stable, so
RF can be decreased in a trade-off of stability for bandwidth.
The table below lists recommended RF values, and the
expected bandwidth, for various closed loop gains.
TABLE 1. OPTIMUM FEEDBACK RESISTOR
GAIN
(AV)
-1
+1
+2
+5
+10
RF (Ω)
330
1.5k
250
330
180
250
BANDWIDTH
(MHz)
290
660
360
315
200
90
Non-inverting Input Source Impedance
For best operation, the DC source impedance seen by the
non-inverting input should be ≥50Ω. This is especially
important in inverting gain configurations where the non-
inverting input would normally be connected directly to GND.
Pulse Undershoot and Asymmetrical Slew Rates
The HFA1135 utilizes a quasi-complementary output stage
to achieve high output current while minimizing quiescent
supply current. In this approach, a composite device
replaces the traditional PNP pulldown transistor. The
composite device switches modes after crossing 0V,
resulting in added distortion for signals swinging below
ground, and an increased undershoot on the negative
portion of the output waveform (see Figures 9, 13, and 17).
This undershoot isn’t present for small bipolar signals, or
large positive signals. Another artifact of the composite
device is asymmetrical slew rates for output signals with a
negative voltage component. The slew rate degrades as the
output signal crosses through 0V (see Figures 9, 13, and
17), resulting in a slower overall negative slew rate. Positive
only signals have symmetrical slew rates as illustrated in the
large signal positive pulse response graphs (see Figures 7,
11, and 15).
PC Board Layout
This amplifier’s frequency response depends greatly on the
care taken in designing the PC board. The use of low
inductance components such as chip resistors and chip
capacitors is strongly recommended, while a solid
ground plane is a must!
Attention should be given to decoupling the power supplies.
A large value (10µF) tantalum in parallel with a small value
(0.1µF) chip capacitor works well in most cases.
Terminated microstrip signal lines are recommended at the
input and output of the device. Capacitance directly on the
output must be minimized, or isolated as discussed in the
next section.
Care must also be taken to minimize the capacitance to
ground at the amplifier’s inverting input (-IN), as this
capacitance causes gain peaking, pulse overshoot, and if
large enough, instability. To reduce this capacitance, the
designer should remove the ground plane under traces
connected to -IN, and keep connections to -IN as short as
possible.
An example of a good high frequency layout is the
Evaluation Board shown in Figure 2.
Driving Capacitive Loads
Capacitive loads, such as an A/D input, or an improperly
terminated transmission line degrade the amplifier’s phase
margin resulting in frequency response peaking and
possible oscillations. In most cases, the oscillation can be
avoided by placing a resistor (RS) in series with the output
prior to the capacitance.
Figure 1 details starting points for the selection of this
resistor. The points on the curve indicate the RS and CL
combinations for the optimum bandwidth, stability, and
settling time, but experimental fine tuning is recommended.
Picking a point above or to the right of the curve yields an
overdamped response, while points below or left of the curve
indicate areas of underdamped performance.
RS and CL form a low pass network at the output, thus
limiting system bandwidth well below the amplifier bandwidth
of 660MHz (AV = +1). By decreasing RS as CL increases (as
illustrated by the curves), the maximum bandwidth is
obtained without sacrificing stability. In spite of this,
bandwidth still decreases as the load capacitance increases.
For example, at AV = +1, RS = 50Ω, CL = 20pF, the overall
bandwidth is 170MHz, but the bandwidth drops to 45MHz at
AV = +1, RS = 10Ω, CL = 330pF.
50
45
40
35
30
25
20
15 AV = +1
10
5
0
0 40 80
AV = +1
AV = +2, RF = 250Ω
120 160 200 240 280 320 360 400
LOAD CAPACITANCE (pF)
FIGURE 1. RECOMMENDED SERIES RESISTOR vs LOAD
CAPACITANCE
5
5 Page 
HFA1135
Typical Performance Curves VSUPPLY = ±5V, TA = 25oC, RF = Value From the Optimum Feedback Resistor Table, RL = 100Ω,
Unless Otherwise Specified (Continued)
VOUT = 200mVP-P
0.2
0.1
0
-0.1
-0.2
-0.3
-0.4
-0.5
-0.6
AV = +2, RF = 250Ω
AV = +2, RF = 330Ω
AV = +1
1 10
FREQUENCY (MHz)
FIGURE 24. GAIN FLATNESS
100
630
200 GAIN
63
20
PHASE
6.3
2.0
0.63
0.2
180
135
90
45
0
0.001 0.01
0.1 1 10
FREQUENCY (MHz)
100 500
FIGURE 25. OPEN LOOP TRANSIMPEDANCE
-10
AV = +2, ±1
-20
-30
-40
-50
-60
-70
-80
-90
-100
1 10 100
FREQUENCY (MHz)
FIGURE 26. REVERSE ISOLATION
1000
AV = +2, RF = 250Ω
1K
100
10
1
0.1
0.01
0.3 1
10 100
FREQUENCY (MHz)
FIGURE 27. OUTPUT RESISTANCE
1000
0.1
0.05
0.025
0
-0.025
-0.05
-0.1
3 13 23 33 43 53 63 73 83 93 103
TIME (ns)
FIGURE 28. SETTLING TIME RESPONSE
11
100 100
INI-
10 10
ENI
INI+
11
0.1 1
10 100
FREQUENCY (kHz)
FIGURE 29. INPUT NOISE CHARACTERISTICS
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet HFA1135.PDF ] | |
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