LM6172AMJ-QML National Semiconductor, LM6172AMJ-QML Datasheet - Page 2

LM6172AMJ-QML

Manufacturer Part Number
LM6172AMJ-QML
Description
Manufacturer
National Semiconductor
Type
Voltage Feedback Amplifierr
Datasheet

Specifications of LM6172AMJ-QML

Rail/rail I/o Type
No
Number Of Elements
2
Unity Gain Bandwidth Product
80MHz
Slew Rate
1700V/us
Common Mode Rejection Ratio
70dB
Input Offset Voltage
1mV
Input Bias Current
2.5uA
Single Supply Voltage (typ)
Not RequiredV
Dual Supply Voltage (typ)
±3/±5/±9/±12/±15V
Power Dissipation
1.03W
Voltage Gain In Db
70dB
Power Supply Rejection Ratio
75dB
Power Supply Requirement
Dual
Shut Down Feature
No
Single Supply Voltage (min)
Not RequiredV
Single Supply Voltage (max)
Not RequiredV
Dual Supply Voltage (min)
±2.75V
Dual Supply Voltage (max)
±18V
Technology
BiCOM
Operating Temp Range
-55C to 125C
Operating Temperature Classification
Military
Mounting
Through Hole
Pin Count
8
Package Type
CDIP
Lead Free Status / Rohs Status
Not Compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LM6172AMJ-QML
Manufacturer:
TI
Quantity:
501
MNLM6172AM-X REV 2A1
Features
(Typical)
- Easy to use Voltage Feedback Topology
- High Slew Rate
- Wide Unity-Gain Bandwidth
- Low Supply Current
- High Output Current
- Specified for +15V and +5V operation
- CONTROLLING DOCUMENT:
Applications
- Scanner I-to-V Converters
- ADSL/HDSL Drivers
- Multimedia Broadcast Systems
- Video Amplifiers
- NTSC, PAL and SECAM Systems
- ADC/DAC Buffers
- Pulse Amplifiers and Peak Detectors
APPLICATION NOTES:
PERFORMANCE DISCUSSION: The LM6172 is a dual high-speed, low power, voltage feedback
amplifier. It is unity-gain stable and offers outstanding performance with only 2.3 mA of
supply current per channel. The combination of 100 MHz unity-gain bandwidth, 3000V/us slew
rate, 50 mA per channel output current and other attractive features make it easy to
implement the LM6172 in various applications. Quiescent power of the LM6172 is 138 mW
operating at +15V supply and 46 mW at +5V supply.
CIRCUIT OPERATION: The class AB input stage in the LM6172 is fully symmetrical and has a
similar slewing characteristic to the current feedback amplifiers. In the LM6172
Simplified Schematic (AN00006), Q1 through Q4 form the equivalent of the current feedback
input buffer, RE the equivalent of the feedback resistor, and stage A buffers the
inverting input. The triple-buffered output stage isolates the gain stage from the load to
provide low output impedance.
SLEW RATE CHARACTERISTIC: The slew rate of LM6172 is determined by the current available
to charge and discharge an internal high impedance node capacitor. This current is the
differential input voltage divided by the total degeneration resistor RE. Therefore, the
slew rate is proportional to the input voltage level, and the higher slew rates are
achievable in the lower gain configurations.
When a very fast large signal pulse is applied to the input of an amplifier, some
overshoot or undershoot occurs. By placing an external series resistor such as 1k Ohm to
the input of LM6172, the slew rate is reduced to help lower the overshoot, which reduces
settling time.
REDUCING SETTLING TIME: The LM6172 has a very fast slew rate that causes overshoot and
undershoot.
series with the input signal to decrease slew rate. A feedback capacitor can also be used
to reduce overshoot and undershoot.
the stability of the amplifier circuit.
initial evaluation.
Ohm must be added in parallel to the feedback capacitor.
Another possible source of overshoot and undershoot comes from a capacitive load at the
output.
LM6172AMJ-QML
LM6172AMJ-QMLV
LM6172AMWG-QML
Please see the section "Driving Capacitive Loads" for more detail.
To reduce settling time on the LM6172, a 1 k Ohm resistor can be placed in
5962-9560401QPA
5962-9560401VPA
5962-9560401QXA
When the LM6172 is configured as a buffer, a feedback resistor of 1 k
This feedback capacitor serves as a zero to increase
2.3 mA/Amplifier
A 2 pF feedback capacitor is recommended for
50 mA/Amplifier
2
3000 V/uS
100 MHz
MICROCIRCUIT DATA SHEET

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