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LT1228C Datasheet(PDF) 1 Page - Linear Technology

Part # LT1228C
Description  100MHz Current Feedback Amplifier with DC Gain Control
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT1228C Datasheet(HTML) 1 Page - Linear Technology

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1
LT1228
100MHz Current Feedback
Amplifier with DC Gain Control
S
APPLICATI
s
Very Fast Transconductance Amplifier
Bandwidth: 75MHz
gm = 10 × ISET
Low THD: 0.2% at 30mVRMS Input
Wide ISET Range: 1µA to 1mA
s
Very Fast Current Feedback Amplifier
Bandwidth: 100MHz
Slew Rate: 1000V/
µs
Output Drive Current: 30mA
Differential Gain: 0.04%
Differential Phase: 0.1
°
High Input Impedance: 25M
Ω, 6pF
s
Wide Supply Range:
±2V to ±15V
s
Inputs Common Mode to Within 1.5V of Supplies
s
Outputs Swing Within 0.8V of Supplies
s
Supply Current: 7mA
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 (
±2V) to 30V (±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, gm, is
set by the current that flows into pin 5, ISET. The small signal
gmisequaltotentimesthevalueofISETandthisrelationship
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.
S
FEATURE
DESCRIPTIO
s
Video DC Restore (Clamp) Circuits
s
Video Differential Input Amplifiers
s
Video Keyer/Fader Amplifiers
s
AGC Amplifiers
s
Tunable Filters
s
Oscillators
Frequency Response
APPLICATI
TYPICAL
FREQUENCY (Hz)
100k
–24
–15
–3
3
6
1M
10M
100M
LT1228 • TA02
0
–6
–9
–12
–18
–21
ISET = 100µA
VS = ±15V
RL = 100Ω
ISET = 1mA
ISET = 300µA
LT1228 • TA01
+
+
+
R3A
10k
R2A
10k
R3
100
R2
100
4.7
µF
R4
1.24k
R6
6.19
R5
10k
ISET
R1
270
RG
10
RF
470
4.7
µF
15V
gm
CFA
VOUT
1
8
6
3
2
7
5
4
–15V
+
VIN
HIGH INPUT RESISTANCE
EVEN WHEN POWER IS OFF
–18dB
< GAIN < 2dB
VIN ≤ 3VRMS
Differential Input Variable Gain Amp


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