LMH6723MA National Semiconductor, LMH6723MA Datasheet - Page 11

• Manufacturer Part Number: LMH6723MA
• Description: Operational Amplifier (Op-Amp) IC
• Manufacturer: National Semiconductor

Specifications of LMH6723MA

• No. Of Amplifiers: 1
• Slew Rate: 600V/µs
• No. Of Pins: 8
• Peak Reflow Compatible (260 C): No
• Input Bias Current: 5000µA
• Supply Voltage Max: 12V
• Leaded Process Compatible: No
• No. Of Channels: 1
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Typical Performance Characteristics
specified. (Continued)
Application Section
GENERAL INFORMATION
The LMH6723/LMH6724/LMH6725 is a high speed current
feedback amplifier manufactured on National Semiconduc-
tor’s VIP10 (Vertically Integrated PNP) complimentary bipo-
lar process. LMH6723/LMH6724/LMH6725 offers a unique
combination of high speed and low quiescent supply current
making it suitable for a wide range of battery powered and
portable applications that require high performance. This
amplifier can operate from 4.5V to 12V nominal supply volt-
ages and draws only 1 mA of quiescent supply current at
10V supplies (
LMH6725 has no internal ground reference so single or split
supply configurations are both equally useful.
EVALUATION BOARDS
National Semiconductor provides the following evaluation
boards as a guide for high frequency layout and as an aid in
device testing and characterization. Many of the datasheet
plots were measured with these boards.
These evaluation boards can be shipped when a device
sample request is placed with National Semiconductor.
FEEDBACK RESISTOR SELECTION
One of the key benefits of a current feedback operational
amplifier is the ability to maintain optimum frequency re-
sponse independent of gain by using appropriate values for
the feedback resistor (R
Typical Performance plots were generated with an R
1200Ω, a gain of +2V/V and
(unless otherwise specified). Generally, lowering R
recommended value will peak the frequency response and
extend the bandwidth; however, increasing the value of R
Device
LMH6723MA
LMH6723MF
LMH6724MA
LMH6725MA
±
5V typically). The LMH6723/LMH6724/
Package
SOIC-8
SOT-23
SOIC-8
SOIC-14
F
). The Electrical Characteristics and
±
5V or
±
Board Part #
CLC730227
CLC730216
CLC730036
CLC730231
2.5V power supplies
F
from it’s
Crosstalk (LMH6725)
F
of
F
A
11
V
= 2, R
will cause the frequency response to roll off faster. Reducing
the value of R
cause overshoot, ringing and, eventually, oscillation.
Figure 1 shows the LMH6723/LMH6724/LMH6725’s fre-
quency response as R
plot shows that an R
1200Ω gives near maximal bandwidth and gain flatness with
good stability. Since each application is slightly different it is
worth some experimentation to find the optimal R
given circuit. In general a value of R
of peaking is the best compromise between stability and
maximal bandwidth. Note that it is not possible to use a
current feedback amplifier with the output shorted directly to
the inverting input. The buffer configuration of the LMH6723/
LMH6724/LMH6725 requires a 2000Ω feedback resistor for
stable operation. For other gains see the charts "R
F
= 1200Ω, R
FIGURE 1. Frequency Response vs. R
20078945
F
too far below it’s recommended value will
L
= 100Ω, unless otherwise
F
F
of 800Ω results in peaking. An R
is varied (R
L
F
= 100Ω, A
that produces ~ 0.1 dB
20078922
V
www.national.com
= +2). This
F
F
vs. Non
F
for a
F
of