Datenblatt-Suchmaschine für elektronische Bauteile
  German  ▼
ALLDATASHEETDE.COM

X  

HS-1145RH Datenblatt(PDF) 2 Page - Intersil Corporation

Teilenummer HS-1145RH
Bauteilbeschribung  Radiation Hardened, High Speed, Low Power, Current Feedback Video Operational Amplifier with Output Disable
Download  9 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Hersteller  INTERSIL [Intersil Corporation]
Direct Link  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

HS-1145RH Datenblatt(HTML) 2 Page - Intersil Corporation

  HS-1145RH_05 Datasheet HTML 1Page - Intersil Corporation HS-1145RH_05 Datasheet HTML 2Page - Intersil Corporation HS-1145RH_05 Datasheet HTML 3Page - Intersil Corporation HS-1145RH_05 Datasheet HTML 4Page - Intersil Corporation HS-1145RH_05 Datasheet HTML 5Page - Intersil Corporation HS-1145RH_05 Datasheet HTML 6Page - Intersil Corporation HS-1145RH_05 Datasheet HTML 7Page - Intersil Corporation HS-1145RH_05 Datasheet HTML 8Page - Intersil Corporation HS-1145RH_05 Datasheet HTML 9Page - Intersil Corporation  
Zoom Inzoom in Zoom Outzoom out
 2 / 9 page
background image
2
FN4227.2
February 14, 2005
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-1145RH design is
optimized for RF = 510Ω 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, however, 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 a gain of +1, a
resistor (+RS) in series with +IN is required to reduce gain
peaking and increase stability.
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.
DISABLE Input TTL Compatibility
The HS-1145RH derives an internal GND reference for the
digital circuitry as long as the power supplies are symmetrical
about GND. With symmetrical supplies the digital switching
threshold (VTH = (VIH + VIL)/2 = (2.0 + 0.8)/2) is 1.4V, which
ensures the TTL compatibility of the DISABLE input. If
asymmetrical supplies (e.g., +10V, 0V) are utilized, the
switching threshold becomes:
and the VIH and VIL levels will be VTH ± 0.6V, respectively.
Optional GND Pad (Die Use Only) for TTL
Compatibility
The die version of the HS-1145RH provides the user with a
GND pad for setting the disable circuitry GND reference.
With symmetrical supplies the GND pad may be left
unconnected, or tied directly to GND. If asymmetrical
supplies (e.g., +10V, 0V) are utilized, and TTL compatibility
is desired, die users must connect the GND pad to GND.
With an external GND, the DISABLE input is TTL compatible
regardless of supply voltage utilized.
Pulse Undershoot and Asymmetrical Slew Rates
The HS-1145RH 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 5, 8, and 11).
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 5, 8, and 11),
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 4,
7, and 10).
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 (10
µF) tantalum in parallel with a small value
(0.1
µF) chip capacitor works well in most cases.
Terminated microstrip signal lines are recommended at the
device’s input and output connections. Capacitance,
parasitic or planned, connected to 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.
GAIN
(ACL)
RF (Ω)
BANDWIDTH
(MHz)
-1
425
300
+1
510 (+RS = 510Ω)
270
+2
510
330
+5
200
300
+10
180
130
V
TH
V+
V-
+
2
------------------- 1.4V
+
=
HS-1145RH


Ähnliche Teilenummer - HS-1145RH_05

HerstellerTeilenummerDatenblattBauteilbeschribung
logo
Intersil Corporation
HS-1145RH INTERSIL-HS-1145RH Datasheet
145Kb / 9P
   Radiation Hardened, High Speed, Low Power, Current Feedback Video Operational Amplifier with Output Disable
More results

Ähnliche Beschreibung - HS-1145RH_05

HerstellerTeilenummerDatenblattBauteilbeschribung
logo
Intersil Corporation
HS-1145RH INTERSIL-HS-1145RH Datasheet
145Kb / 9P
   Radiation Hardened, High Speed, Low Power, Current Feedback Video Operational Amplifier with Output Disable
HS-1245RH INTERSIL-HS-1245RH Datasheet
44Kb / 4P
   Radiation Hardened, Dual, High Speed, Low Power Video Operational Amplifier with Output Disable
HFA1145 INTERSIL-HFA1145 Datasheet
26Kb / 5P
   High Speed, Low Power, Current Feedback Video Operational Amplifier with Output Disable
June 1994
HS-1410RH INTERSIL-HS-1410RH Datasheet
23Kb / 2P
   Radiation Hardened, High Speed, Low Power, Current Feedback Op Amp with Output Disable
HFA1145 INTERSIL-HFA1145_06 Datasheet
418Kb / 13P
   330MHz, Low Power, Current Feedback Video Operational Amplifier with Output Disable
logo
Renesas Technology Corp
HFA1145 RENESAS-HFA1145 Datasheet
711Kb / 13P
   330MHz, Low Power, Current Feedback Video Operational Amplifier with Output Disable
logo
Intersil Corporation
HS-1254RH INTERSIL-HS-1254RH Datasheet
18Kb / 3P
   Radiation Hardened, High Speed, Low Power Dual Operational Amplifier with Disable
HS-1135RH INTERSIL-HS-1135RH_09 Datasheet
258Kb / 9P
   Radiation Hardened, High Speed, Low Power Current Feedback Amplifier
HS-1135RH INTERSIL-HS-1135RH Datasheet
63Kb / 5P
   Radiation Hardened, High Speed, Low Power Current Feedback Amplifier with Programmable Output Limiting
logo
Renesas Technology Corp
HFA1245 RENESAS-HFA1245 Datasheet
549Kb / 14P
   Dual, 420MHz, Low Power, Video, Current Feedback Operational Amplifier with Disable
July 2004
More results


Html Pages

1 2 3 4 5 6 7 8 9


Datenblatt Download

Go To PDF Page


Link URL




Privatsphäre und Datenschutz
ALLDATASHEETDE.COM
War ALLDATASHEET hilfreich?  [ DONATE ] 

Über Alldatasheet   |   Werbung   |   Kontakt   |   Privatsphäre und Datenschutz   |   Linktausch   |   Hersteller
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com