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LT1228IS8#TRPBF

Description
IC OPAMP CFA 100MHZ 8SO
CategoryAnalog mixed-signal IC    Amplifier circuit   
File Size655KB,22 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Environmental Compliance
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LT1228IS8#TRPBF Overview

IC OPAMP CFA 100MHZ 8SO

LT1228IS8#TRPBF Parametric

Parameter NameAttribute value
Brand NameLinear Technology
Is it Rohs certified?conform to
MakerLinear ( ADI )
Parts packaging codeSOIC
package instructionSOP,
Contacts8
Manufacturer packaging codeS8
Reach Compliance Codecompliant
ECCN codeEAR99
Amplifier typeOPERATIONAL AMPLIFIER
Nominal Common Mode Rejection Ratio69 dB
Maximum input offset voltage15000 µV
JESD-30 codeR-PDSO-G8
JESD-609 codee3
length4.9025 mm
Humidity sensitivity level1
Negative supply voltage upper limit-18 V
Nominal Negative Supply Voltage (Vsup)-5 V
Number of functions1
Number of terminals8
Maximum operating temperature85 °C
Minimum operating temperature-40 °C
Package body materialPLASTIC/EPOXY
encapsulated codeSOP
Package shapeRECTANGULAR
Package formSMALL OUTLINE
Peak Reflow Temperature (Celsius)260
Certification statusNot Qualified
Maximum seat height1.752 mm
Nominal slew rate3500 V/us
Supply voltage upper limit18 V
Nominal supply voltage (Vsup)5 V
surface mountYES
technologyBIPOLAR
Temperature levelINDUSTRIAL
Terminal surfaceMatte Tin (Sn)
Terminal formGULL WING
Terminal pitch1.27 mm
Terminal locationDUAL
Maximum time at peak reflow temperature30
width3.899 mm
LT1228
100MHz Current Feedback
Amplifier with DC Gain Control
FEATURES
n
DESCRIPTION
The LT
®
1228 makes it easy to electronically control the
gain of signals from DC to video frequencies. The LT1228
implements gain control with a transconductance ampli-
fier (voltage to current) whose gain is proportional to an
externally 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, 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 out-
put of the transconductance amplifier. The current feedback
amplifier maintains its wide bandwidth over a wide range of
voltage gains making it easy to interface the transconduc-
tance amplifier output to other circuitry. The current feed-
back amplifier is designed to drive low impedance loads,
such as cables, with excellent linearity at high frequencies.
n
n
n
n
n
n
Very Fast Transconductance Amplifier
Bandwidth: 75MHz
g
m
= 10
×
I
SET
Low THD: 0.2% at 30mV
RMS
Input
Wide I
SET
Range: 1µA to 1mA
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: 25MΩ, 6pF
Wide Supply Range: ±2V to ±15V
Inputs Common Mode to Within 1.5V of Supplies
Outputs Swing Within 0.8V of Supplies
Supply Current: 7mA
Available in 8-Lead PDIP and SO Packages
APPLICATIONS
n
n
n
n
n
n
Video DC Restore (Clamp) Circuits
Video Differential Input Amplifiers
Video Keyer/Fader Amplifiers
AGC Amplifiers
Tunable Filters
Oscillators
L,
LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
Differential Input Variable Gain Amp
15V
R3A
10k
R2A
10k
7
g
m
1
4
5
I
SET
4.7µF
R4
1.24k
R6
6.19k
R5
10k
8
6
3
0
–3
Frequency Response
I
SET
= 1mA
V
S
= ±15V
R
L
= 100
+
3
2
4.7µF
V
IN
+
CFA
GAIN (dB)
+
+
–6
–9
–12
–15
–18
–21
–24
100k
I
SET
= 100µA
1M
10M
100M
LT1228 • TA02
6
R
F
470Ω
V
OUT
I
SET
= 300µA
–15V
+
R3
100Ω
R2
100Ω
R1
270Ω
RG
10Ω
HIGH INPUT RESISTANCE
EVEN WHEN POWER IS OFF
–18dB < GAIN < 2dB
V
IN
≤ 3V
RMS
LT1228 • TA01
FREQUENCY (Hz)
1228fd
1

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Description IC OPAMP CFA 100MHZ 8SO IC opamp cfa 100mhz 8so IC opamp cfa 100mhz 8so IC OPAMP CFA 100MHZ 8SO IC OPAMP CFA 100MHZ 8SO IC OPAMP CFA 100MHZ 8DIP IC OPAMP CFA 100MHZ 8DIP
Brand Name Linear Technology Linear Technology Linear Technology Linear Technology Linear Technology Linear Technology Linear Technology
Is it Rohs certified? conform to incompatible conform to conform to conform to conform to conform to
Maker Linear ( ADI ) Linear ( ADI ) Linear ( ADI ) Linear ( ADI ) Linear ( ADI ) Linear ( ADI ) Linear ( ADI )
Parts packaging code SOIC SOIC SOIC SOIC SOIC DIP DIP
package instruction SOP, SOP, SOP, SOP, SOP, DIP, DIP,
Contacts 8 8 8 8 8 8 8
Manufacturer packaging code S8 S8 S8 S8 S8 N N
Reach Compliance Code compliant _compli compliant compliant compliant compliant compliant
ECCN code EAR99 EAR99 EAR99 EAR99 EAR99 EAR99 EAR99
Amplifier type OPERATIONAL AMPLIFIER OPERATIONAL AMPLIFIER OPERATIONAL AMPLIFIER OPERATIONAL AMPLIFIER OPERATIONAL AMPLIFIER OPERATIONAL AMPLIFIER OPERATIONAL AMPLIFIER
Nominal Common Mode Rejection Ratio 69 dB 69 dB 69 dB 69 dB 69 dB 69 dB 69 dB
Maximum input offset voltage 15000 µV 15000 µV 15000 µV 15000 µV 15000 µV 15000 µV 15000 µV
JESD-30 code R-PDSO-G8 R-PDSO-G8 R-PDSO-G8 R-PDSO-G8 R-PDSO-G8 R-PDIP-T8 R-PDIP-T8
JESD-609 code e3 e0 e3 e3 e3 e3 e3
length 4.9025 mm 4.9025 mm 4.9025 mm 4.9025 mm 4.9025 mm 10.16 mm 10.16 mm
Humidity sensitivity level 1 1 1 1 1 1 1
Negative supply voltage upper limit -18 V -18 V -18 V -18 V -18 V -18 V -18 V
Nominal Negative Supply Voltage (Vsup) -5 V -5 V -5 V -5 V -5 V -5 V -5 V
Number of functions 1 1 1 1 1 1 1
Number of terminals 8 8 8 8 8 8 8
Maximum operating temperature 85 °C 70 °C 70 °C 70 °C 85 °C 70 °C 85 °C
Package body material PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY
encapsulated code SOP SOP SOP SOP SOP DIP DIP
Package shape RECTANGULAR RECTANGULAR RECTANGULAR RECTANGULAR RECTANGULAR RECTANGULAR RECTANGULAR
Package form SMALL OUTLINE SMALL OUTLINE SMALL OUTLINE SMALL OUTLINE SMALL OUTLINE IN-LINE IN-LINE
Peak Reflow Temperature (Celsius) 260 235 260 260 260 NOT SPECIFIED NOT SPECIFIED
Certification status Not Qualified Not Qualified Not Qualified Not Qualified Not Qualified Not Qualified Not Qualified
Maximum seat height 1.752 mm 1.752 mm 1.752 mm 1.752 mm 1.752 mm 3.937 mm 3.937 mm
Nominal slew rate 3500 V/us 3500 V/us 3500 V/us 3500 V/us 3500 V/us 3500 V/us 3500 V/us
Supply voltage upper limit 18 V 18 V 18 V 18 V 18 V 18 V 18 V
Nominal supply voltage (Vsup) 5 V 5 V 5 V 5 V 5 V 5 V 5 V
surface mount YES YES YES YES YES NO NO
technology BIPOLAR BIPOLAR BIPOLAR BIPOLAR BIPOLAR BIPOLAR BIPOLAR
Temperature level INDUSTRIAL COMMERCIAL COMMERCIAL COMMERCIAL INDUSTRIAL COMMERCIAL INDUSTRIAL
Terminal surface Matte Tin (Sn) Tin/Lead (Sn/Pb) Matte Tin (Sn) Matte Tin (Sn) Matte Tin (Sn) Matte Tin (Sn) Matte Tin (Sn)
Terminal form GULL WING GULL WING GULL WING GULL WING GULL WING THROUGH-HOLE THROUGH-HOLE
Terminal pitch 1.27 mm 1.27 mm 1.27 mm 1.27 mm 1.27 mm 2.54 mm 2.54 mm
Terminal location DUAL DUAL DUAL DUAL DUAL DUAL DUAL
Maximum time at peak reflow temperature 30 20 30 30 30 NOT SPECIFIED NOT SPECIFIED
width 3.899 mm 3.899 mm 3.899 mm 3.899 mm 3.899 mm 7.62 mm 7.62 mm
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