LT1229 Linear Technology, LT1229 Datasheet

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LT1229

Manufacturer Part Number
LT1229
Description
Dual and Quad 100MHz Current Feedback Amplifiers
Manufacturer
Linear Technology
Datasheet

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FEATURE
A
TYPICAL
HIGH INPUT RESISTANCE DOES NOT LOAD CABLE EVEN
WHEN POWER IS OFF
PPLICATI
100MHz Bandwidth
1000V/ s Slew Rate
Low Cost
30mA Output Drive Current
0.04% Differential Gain
0.1 Differential Phase
High Input Impedance: 25M , 3pF
Wide Supply Range: 2V to 15V
Low Supply Current: 6mA Per Amplifier
Inputs Common Mode to Within 1.5V of Supplies
Outputs Swing Within 0.8V of Supplies
Video Instrumentation Amplifiers
Cable Drivers
RGB Amplifiers
Test Equipment Amplifiers
3.01k
3.01k
R
G1
V
IN –
12.1k
S
A
+
LT1229
O
PPLICATI
1/2
750
R
Video Loop Through Amplifier
U
F1
S
BNC INPUTS
3.01k
187
R
O
G2
U
V
IN +
12.1k
+
LT1229
1/2
750
R
1% RESISTORS
WORST CASE CMRR = 22dB
TYPICALLY = 38dB
V
R
R
R
TRIM CMRR WITH R
F2
OUT
F1
G1
G2
= R
=
= (G – 1) R
= G (V
G – 1
F2
R
F2
IN +
– V
F2
IN –
LT1229 • TA01
G1
V
)
OUT
D
The LT1229/LT1230 dual and quad 100MHz current feed-
back amplifiers are designed for maximum performance
in small packages. Using industry standard pinouts, the
dual is available in the 8-pin miniDIP and the 8-pin SO
package while the quad is in the 14-pin DIP and 14-pin SO.
The amplifiers are designed to operate on almost any
available supply voltage from 4V ( 2V) to 30V ( 15V).
These current feedback amplifiers have very high input
impedance and make excellent buffer amplifiers. They
maintain their wide bandwidth for almost all closed-loop
voltage gains. The amplifiers drive over 30mA of output
current and are optimized to drive low impedance loads,
such as cables, with excellent linearity at high frequencies.
The LT1229/LT1230 are manufactured on Linear
Technology’s proprietary complementary bipolar process.
For a single amplifier like these see the LT1227 and for
better DC accuracy see the LT1223.
Current Feedback Amplifiers
ESCRIPTIO
Dual and Quad 100MHz
–20
–30
–40
–50
–60
–10
10
0
10
Loop Through Amplifier Frequency
COMMON-MODE SIGNAL
NORMAL SIGNAL
100
U
1k
FREQUENCY (Hz)
Response
10k
100k
LT1229/LT1230
1M
LT1229 • TA02
10M
100M
1

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LT1229 Summary of contents

Page 1

... WHEN POWER IS OFF Current Feedback Amplifiers D ESCRIPTIO The LT1229/LT1230 dual and quad 100MHz current feed- back amplifiers are designed for maximum performance in small packages. Using industry standard pinouts, the dual is available in the 8-pin miniDIP and the 8-pin SO package while the quad is in the 14-pin DIP and 14-pin SO. ...

Page 2

... LT1229/LT1230 BSOLUTE Supply Voltage ...................................................... 18V Input Current ...................................................... 15mA Output Short Circuit Duration (Note 1) ......... Continuous Operating Temperature Range LT1229C, LT1230C ............................... LT1229M, LT1230M ....................... – 125 C U PACKAGE/ORDER I FOR ATIO TOP VIEW + OUT – OUT B ...

Page 3

... Note 2: The power tests done on 15V supplies are done on only one amplifier at a time to prevent excessive junction temperatures when testing at maximum operating temperature. Note 3: The supply current of the LT1229/LT1230 has a negative temperature coefficient. For more information see the application information section. ...

Page 4

... Bandwidth vs Supply Voltage, Gain = 100 500 SUPPLY VOLTAGE (±V) LT1229 • TPC08 = 1k 0.5dB 5dB LT1229 • TPC03 = 500 750 LT1229 • ...

Page 5

... TEMPERATURE (°C) Output Impedance vs Frequency 100 V = ±15V 0.1 0.01 0.001 100M 10k 100k 1M FREQUENCY (Hz) 2ND 3RD 100 LT1229 • TPC12 100 125 150 175 LT1229 • TPC15 = 750 10M 100M LT1229 • TPC18 5 ...

Page 6

... SETTLING TIME ( s) LT1229 • TPC20 One Amplifier –IN Supply Current vs Supply Voltage 125° 175° SUPPLY VOLTAGE (± OUT V – LT1229 • TA03 –55°C 25° LT1229 • TPC21 ...

Page 7

... A PPLICATI S I FOR ATIO The LT1229/LT1230 are very fast dual and quad current feedback amplifiers. Because they are current feedback amplifiers, they maintain their wide bandwidth over a wide range of voltage gains. These amplifiers are designed to drive low impedance loads such as cables with excellent linearity at high frequencies ...

Page 8

... P d MAX P d MAX Now if that is the dual LT1229, the total power in the package is twice that, or 0.602W. We now must calcu- late how much the die temperature will rise above the ambient. The total power dissipation times the thermal resistance of the package gives the amount of tempera- ture rise ...

Page 9

... This is because the input stage and the output stage both have slew rate limitations. The input stage of the LT1229/LT1230 amplifiers slew at about 100V/ s before they become nonlinear. Faster input sig- nals will turn on the normally reverse-biased emitters on the input transistors and enhance the slew rate signifi- cantly ...

Page 10

... This is due to the crosstalk back to the input of the first amplifier. 1M 10M 100M For best results when cascading amplifiers use the LT1229 and drive amplifier B and follow it with amplifier A. LT1229 • TA12 S (the sync pulses). R4, R5 and R6 set the amplifier up with a gain of two and bias the output so the bottom of the sync pulses are at 1 ...

Page 11

... BSC OUT LT1229 • TA10 5 0.220 – 0.310 (5.588 – 7.874 0392 0.250 ± 0.010 (6.350 ± 0.254) N8 0392 5 0.150 – 0.157 (3.810 – 3.988) ...

Page 12

... LT1229/LT1230 PACKAGE DESCRIPTIO 0.290 – 0.320 (7.366 – 8.128) 0.008 – 0.018 0° – 15° (0.203 – 0.460) 0.385 ± 0.025 0.038 – 0.068 (9.779 ± 0.635) (0.965 – 1.727) 0.300 – 0.325 (7.620 – 8.255) 0.015 (0.380) MIN 0.130 ± 0.005 (3.302 ± ...

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