Datasheet LM6104M, LM6104MX Datasheet (NSC)

TL/H/11979

LM6104 Quad Gray Scale Current Feedback Amplifier

June 1994

LM6104
Quad Gray Scale Current Feedback Amplifier

General Description

The LM6104 quad amplifier meets the requirements of bat­tery operated liquid crystal displays by providing high speed
while maintaining low power consumption.

Combining this high speed with high integration, the
LM6104 conserves valuable board space in portable sys­tems with a cost effective, surface mount quad package.

Built on National’s advanced high speed VIP

TM

(Vertically
Integrated PNP) process, the LM6104 current feedback ar­chitecture is easily compensated for speed and loading con­ditions. These features make the LM6104 ideal for buffering
grey levels in liquid crystal displays.

Features (Typical unless otherwise noted)

Y

Low power I

S

e

875 mA/amplifier

Y

Slew rate 100V/ms

Y

b

3dB bandwidth (R

F

e

1kX) 30 MHz

Y

High output drive

g

5V into 100X

Y

Wide operating range V

S

e

5V tog12V

Y

High integration Quad surface mount

Applications

Y

Grey level buffer for liquid crystal displays

Y

Column buffer for portable LCDs

Y

Video distribution amplifiers, video line drivers

Y

Hand-held, high speed signal conditioning

Typical Application

LCD Buffer Application for Grey Levels

TL/H/11979– 1

Connection Diagram

TL/H/11979– 2

Order Number LM6104M

See NS Package Number M14A

VIPTMis a trademark of National Semiconductor Corporation.

C

1995 National Semiconductor Corporation RRD-B30M115/Printed in U. S. A.

Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales
Office/Distributors for availability and specifications.

Supply Voltage 24V

Differential Input Voltage

g

6V

Input Voltage

g

Supply Voltage

Inverting Input Current 15 mA

Soldering Information

Vapor Phase (60s) 215

§

C

Infrared (15s) 220

§

C

Storage Temperature Range

b

65§CsT

J

s

a

150§C

Maximum Junction Temperature 150§C

ESD Rating (Note 2) 2000V

Operating Ratings

Supply Voltage Range 4.75V to 24V

Junction Temperature Range (Note 3)

LM6104M

b

20

§

s

T

J

s

a

80§C

Electrical Characteristics

The following specifications apply for Vae8V, V

beb

5V, R

L

e

R

F

e

2kXand 0

§

s

T

J

s

60§C unless otherwise noted.

Symbol Parameter Conditions

LM6104M

Units

Typical Limits

(Note 4) (Note 5)

V

OS

Input Offset Voltage 10 30 mV max

I

B

Inverting Input Bias Current 5.0 20 mA max

Non-Inverting Input Bias Current 0.5 2 mA max

I

S

Supply Current V

O

e

0V 3.5 4.0 mA max

I

SC

Output Source Current V

O

e

0V

60 45

mA

I

IN(b)

eb

100 mA min

Output Sink Current V

O

e

0V

60 45

mA

I

IN(b)

e

100 mA min

V

O

Positive Output Swing I

IN(b)

eb

100 mA 6.5 6.1 V min

Negative Output Swing I

IN(b)

e

100 mA

b

3.5

b

3.1 V max

PSRR Power Supply Rejection Ratio V

S

e

g

4tog10V 70 60 dB min

100 mV pp@100 kHz 40 30 dB min

R

T

Transresistance 10 5 MX min

SR Slew Rate (Note 6) 100 55 V/ms min

BW Bandwidth A

V

eb

1

7.5 5.0 MHz

R

IN

e

R

F

e

2kX

Amp-to-Amp Isolation R

L

e

2kX

60 dB

F

e

1 MHz

CMVR Common Mode Voltage Range V

a

b

1.4V
V

V

b

a

1.4V

CMRR Common Mode Rejection Ratio 60 dB

t

S

Settling Time 0.05%, 5V Step, A

V

eb

1

240 ns

R

F

e

R

S

e

2kX,V

S

e

g

5V

Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. DC and AC electrical specifications do not apply when operating
the device beyond its rated operating conditions. Operating ratings indicate conditions the device is intended to be functional, but device parameter specifications
may not be guaranteed under the conditions.

Note 2: Human body model 1.5 kX and 100 pF. This is a class 2 device rating.

Note 3: Thermal resistance of the SO package is 98

§

C/W. When operating at T

A

e

80§C, maximum power dissipation is 700 mW.

Note 4: Typical values represent the most likely parametric norm.

Note 5: All limits guaranteed at operating temperature extremes.

Note 6: A

V

eb

1 with R

IN

e

R

F

e

2kX. Slew rate is calculated from the 25% to the 75% point on both rising and falling edges. Output swing isb0.6V toa5.6V

and 5.6V to 0.6V.

2

Typical Performance Characteristics

Closed Loop Gain

Frequency Response vs

Amplifier Isolation

Amplifier to

Supply Voltage

Supply Current vs

A

V

eb

1

Large Signal Pulse Response

A

V

eb

1, R

F

e

R

G

Frequency Response vs R

F

I

IN

e

g

100 mA

V

S

e

g

5V

V

OUT

Referred to Supplies

vs Source Current

LM6104 Output Voltage

vs Sink Current

LM6104 Output Voltage

TL/H/11979– 3

3

Applications Information

CURRENT FEEDBACK TOPOLOGY

The small-signal bandwidth of conventional voltage feed­back amplifiers is inversely proportional to the closed-loop
gain based on the gain-bandwidth concept. In contrast, the
current feedback amplifier topology, such as the LM6104,
enables a signal bandwidth that is relatively independent of
the amplifier’s gain (see typical curve Frequency Response
vs Closed Loop Gain).

FEEDBACK RESISTOR SELECTION: R

F

Current feedback amplifier bandwidth and slew rate are
controlled by R

F.RF

and the amplifier’s internal compensa­tion capacitor set the dominant pole in the frequency re­sponse. The amplifier, therefore, always requires a feed­back resistor, even in unity gain.

Bandwidth and slew rate are inversely proportional to the
value of R

F

(see typical curve Frequency Response vs RF).
This makes the amplifier especially easy to compensate for
a desired pulse response (see typical curve Large Signal
Pulse Response). Increased capacitive load driving capabili­ty is also achieved by increasing the value of R

F

.

The LM6104 has guaranteed performance with a feedback
resistor of 2 kX.

CAPACITIVE FEEDBACK

It is common to place a small lead capacitor in parallel with
feedback resistance to compensate voltage feedback am­plifiers. Do not place a capacitor across R

F

to limit the band­width of current feedback amplifiers. The dynamic imped­ance of capacitors in the feedback path of the LM6104, as
with any current feedback amplifier, will cause instability.

4

5

LM6104 Quad Gray Scale Current Feedback Amplifier

Physical Dimensions inches (millimeters)

14-Pin SO Package

Order Number LM6104M

NS Package Number M14A

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SEMICONDUCTOR CORPORATION. As used herein:

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systems which, (a) are intended for surgical implant support device or system whose failure to perform can
into the body, or (b) support or sustain life, and whose be reasonably expected to cause the failure of the life
failure to perform, when properly used in accordance support device or system, or to affect its safety or
with instructions for use provided in the labeling, can effectiveness.
be reasonably expected to result in a significant injury
to the user.

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