Operational Amplifier. HS-1245RH Datasheet

HS-1245RH Amplifier. Datasheet pdf. Equivalent

Part HS-1245RH
Description Low Power Video Operational Amplifier
Feature DATASHEET HS-1245RH Radiation Hardened, Dual, High Speed, Low Power Video Operational Amplifier wit.
Manufacture Intersil Corporation
Datasheet
Download HS-1245RH Datasheet




HS-1245RH
DATASHEET
HS-1245RH
Radiation Hardened, Dual, High Speed, Low Power Video Operational Amplifier
with Output Disable
FN4229
Rev.1.00
August 1999
The HS-1245RH is a radiation hardened dual high speed,
low power current feedback amplifier built with Intersil’s
proprietary complementary bipolar UHF-1 (DI bonded wafer)
process. These devices are QML approved and are
processed and screened in full compliance with
MIL-PRF-38535.
This amplifier features individual TTL/CMOS compatible
disable controls, which when pulled low, reduce the supply
current and force the output into a high impedance state.
This allows easy implementation of simple, low power video
switching and routing systems. Component and composite
video systems also benefit from this op amp’s excellent gain
flatness, and good differential gain and phase specifications.
Multiplexed A/D applications will also find the HS-1245RH
useful as the A/D driver/multiplexer.
Specifications for Rad Hard QML devices are controlled
by the Defense Supply Center in Columbus (DSCC). The
SMD numbers listed here must be used when ordering.
Detailed Electrical Specifications for these devices are
contained in SMD 5962-96832. A “hot-link” is provided
on our homepage for downloading.
www.intersil.com/spacedefense/space.asp
Ordering Information
ORDERING NUMBER
INTERNAL
MKT. NUMBER
5962F9683201VCA
HS1-1245RH-Q
5962F9683201VCC
HS1B-1245RH-Q
TEMP. RANGE
(oC)
-55 to 125
-55 to 125
Features
• Electrically Screened to SMD # 5962-96832
• QML Qualified per MIL-PRF-38535 Requirements
• MIL-PRF-38535 Class V Compliant
• Low Supply Current . . . . . . . . . . . . . . . . . . . 5.9mA (Typ)
• Wide -3dB Bandwidth. . . . . . . . . . . . . . . . . 530MHz (Typ)
• High Slew Rate . . . . . . . . . . . . . . . . . . . . .1050V/s (Typ)
• Excellent Gain Flatness (to 50MHz). . . . . . 0.11dB (Typ)
• Excellent Differential Gain . . . . . . . . . . . . . . . 0.02% (Typ)
• Excellent Differential Phase . . . . . . . . . 0.03 Degree (Typ)
• High Output Current . . . . . . . . . . . . . . . . . . . 60mA (Typ)
• Individual Output Enable/Disable
• Output Enable / Disable Time . . . . . . . . 160ns/20ns (Typ)
• Total Gamma Dose . . . . . . . . . . . . . . . . . . . 300kRAD(Si)
• Latch Up. . . . . . . . . . . . . . . . . . . . . None (DI Technology)
Applications
• Multiplexed Flash A/D Driver
• RGB Multiplexers and Preamps
• Video Switching and Routing
• Pulse and Video Amplifiers
• Wideband Amplifiers
• Hand Held and Miniaturized RF Equipment
• Battery Powered Communications
Pinout
HS-1245RH (CERDIP) GDIP1-T14
OR
HS-1245RH (SBDIP) CDIP2-T14
TOP VIEW
-IN1 1
+IN1 2
DISABLE 1 3
V- 4
DISABLE 2 5
+IN2 6
-IN2 7
-
+
+
-
14 OUT1
13 NC
12 GND
11 V+
10 NC
9 NC
8 OUT2
FN4229 Rev.1.00
August 1999
Page 1 of 5



HS-1245RH
HS-1245RH
Application Information
Optimum Feedback Resistor
Although a current feedback amplifier’s bandwidth dependency
on closed loop gain isn’t as severe as that of a voltage
feedback amplifier, there can be an appreciable decrease in
bandwidth at higher gains. This decrease may be minimized by
taking advantage of the current feedback amplifier’s unique
relationship between bandwidth and RF . All current feedback
amplifiers require a feedback resistor, even for unity gain
applications, and RF, in conjunction with the internal
compensation capacitor, sets the dominant pole of the
frequency response. Thus, the amplifier’s bandwidth is
inversely proportional to RF. The HS-1245RH design is
optimized for a 560RF at a gain of +2. Decreasing RF
decreases stability, resulting in excessive peaking and
overshoot (Note: Capacitive feedback will cause the same
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 for various gains,
and the expected bandwidth. For good channel-to- channel gain
matching, it is recommended that all resistors (termination as well
as gain setting) be 1% tolerance or better. Note that a series
input resistor, on +IN, is required for a gain of +1, to reduce gain
peaking and increase stability.
GAIN
(ACL)
-1
+1
+2
RF ()
510
560 (+RS = 560)
560
BANDWIDTH
(MHz)
230
290
530
Non-Inverting Input Source Impedance
For best operation, the D.C. source impedance looking out of
the non-inverting input should be 50This is especially
important in inverting gain configurations where the non-
inverting input would normally be connected directly to GND.
Optional GND Pin for TTL Compatibility
The HS-1245RH derives an internal GND reference for the
digital circuitry as long as the power supplies are symmetrical
about GND. The GND reference is used to ensure the TTL
compatibility of the DISABLE inputs. With symmetrical supplies
the GND pin (Pin 12) may be floated, or connected directly to
GND. If asymmetrical supplies (e.g. +10V, 0V) are utilized, and
TTL compatibility is desired, the GND pin must be connected
to GND.
PC Board Layout
The frequency response of this amplifier depends greatly on
the amount of 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!
FN4229 Rev.1.00
August 1999
Attention should be given to decoupling the power supplies. A
large value (10F) tantalum in parallel with a small value
(0.1F) 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
seen by the amplifier’s inverting input (-IN). The larger this
capacitance, the worse the gain peaking, resulting in pulse
overshoot and possible instability. To this end, it is
recommended that the ground plane be removed under traces
connected to -IN, and connections to -IN should be kept as
short as possible.
Driving Capacitive Loads
Capacitive loads, such as an A/D input, or an improperly
terminated transmission line will 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 290MHz (for AV = +1). By decreasing RS as CLincreases
(as illustrated in the curves), the maximum bandwidth is
obtained without sacrificing stability. Even so, bandwidth
does decrease as you move to the right along the curve. For
example, at AV = +1, RS = 62, CL = 40pF, the overall
bandwidth is limited to 180MHz, and bandwidth drops to
70MHz at AV = +1, RS = 8, CL = 400pF.
50
40
30
20 AV = +1
AV = +2
10
0
0 50 100 150 200 250 300 350 400
LOAD CAPACITANCE (pF)
FIGURE 1. RECOMMENDED SERIES OUTPUT RESISTOR vs
LOAD CAPACITANCE
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