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LT1228MJ8 Datasheet

  • LT1228MJ8

  • 100MHz Current Feedback Amplifier with DC Gain Control

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LT1228
100MHz Current Feedback
Amplifier with DC Gain Control
DESCRIPTIO
The LT1228 makes it easy to electronically control the gain
of signals from DC to video frequencies. The LT1228
implements gain control with a transconductance amplifier
(voltage to current) whose gain is proportional to an exter-
nally controlled current. A resistor is typically used to
convert the output current to a voltage, which is then
amplified with a current feedback amplifier. The LT1228
combines both amplifiers into an 8-pin package, and oper-
ates on any supply voltage from 4V (鹵2V) to 30V (鹵15V). A
complete differential input, gain controlled amplifier can be
implemented with the LT1228 and just a few resistors.
The LT1228 transconductance amplifier has a high imped-
ance differential input and a current source output with wide
output voltage compliance. The transconductance, g
m
, is
set by the current that flows into pin 5, I
SET
. The small signal
g
m
is equal to ten times the value of I
SET
and this relationship
holds over several decades of set current. The voltage at pin
5 is two diode drops above the negative supply, pin 4.
The LT1228 current feedback amplifier has very high input
impedance and therefore it is an excellent buffer for the
output of the transconductance amplifier. The current feed-
back amplifier maintains its wide bandwidth over a wide
range of voltage gains making it easy to interface the
transconductance amplifier output to other circuitry. The
current feedback amplifier is designed to drive low imped-
ance loads, such as cables, with excellent linearity at high
frequencies.
Frequency Response
6
3
0
鈥?
1
4
5
8
I
SET
4.7碌F
R4
1.24k
R6
6.19鈩?/div>
R5
10k
FEATURES
s
s
s
s
s
s
Very Fast Transconductance Amplifier
Bandwidth: 75MHz
g
m
= 10
脳
I
SET
Low THD: 0.2% at 30mV
RMS
Input
Wide I
SET
Range: 1碌A(chǔ) to 1mA
Very Fast Current Feedback Amplifier
Bandwidth: 100MHz
Slew Rate: 1000V/碌s
Output Drive Current: 30mA
Differential Gain: 0.04%
Differential Phase: 0.1擄
High Input Impedance: 25M鈩? 6pF
Wide Supply Range:
鹵2V
to
鹵15V
Inputs Common Mode to Within 1.5V of Supplies
Outputs Swing Within 0.8V of Supplies
Supply Current: 7mA
APPLICATI
s
s
s
s
s
s
S
Video DC Restore (Clamp) Circuits
Video Differential Input Amplifiers
Video Keyer/Fader Amplifiers
AGC Amplifiers
Tunable Filters
Oscillators
TYPICAL APPLICATI
R3A
10k
R2A
10k
Differential Input Variable Gain Amp
15V
4.7碌F
+
3
g
m
2
V
IN
+
CFA
6
R
F
470鈩?/div>
HIGH INPUT RESISTANCE
EVEN WHEN POWER IS OFF
鈥?8dB
<
GAIN
<
2dB
V
IN
鈮?/div>
3V
RMS
LT1228 鈥?TA01
GAIN (dB)
+
鈥?/div>
+
鈥?/div>
7
V
OUT
鈥?5V
R3
100鈩?/div>
R2
100鈩?/div>
鈥?/div>
R1
270鈩?/div>
RG
10鈩?/div>
U
UO
+
UO
V
S
= 鹵15V
R
L
= 100鈩?/div>
I
SET
= 1mA
鈥?
鈥?
鈥?2
鈥?5
鈥?8
鈥?1
鈥?4
100k
I
SET
= 100碌A(chǔ)
I
SET
= 300碌A(chǔ)
1M
10M
100M
LT1228 鈥?TA02
FREQUENCY (Hz)
1

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