LT1217 Linear Technology, LT1217 Datasheet

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LT1217

Manufacturer Part Number
LT1217
Description
Low Power 10MHz Current Feedback Amplifier
Manufacturer
Linear Technology
Datasheet

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FEATURE
A
TYPICAL
PPLICATI
1mA Quiescent Current
50mA Output Current (Minimum)
10MHz Bandwidth
500V/ s Slew Rate
280ns Settling Time to 0.1%
Wide Supply Range, 5V to 15V
1mV Input Offset Voltage
100nA Input Bias Current
100M Input Resistance
Video Amplifiers
Buffers
IF and RF Amplification
Cable Drivers
8, 10, 12-Bit Data Acquisition Systems
V
IN
A
AT AMPLIFIER OUTPUT.
6dB LESS AT V
V
R
3k
A
S
G
= 1 +
O
PPLICATI
+
R
R
LT1217
G
F
U
R
3k
F
S
OUT
Cable Driver
.
O
75
U
75
LT1217 • TA01
75
CABLE
V
OUT
D
The LT1217 is a 10MHz current feedback amplifier with DC
characteristics better than many voltage feedback ampli-
fiers. This versatile amplifier is fast, 280ns settling to 0.1%
for a 10V step thanks to its 500V/ s slew rate. The LT1217
is manufactured on Linear Technology’s proprietary
complementary bipolar process resulting in a low 1mA
quiescent current. To reduce power dissipation further,
the LT1217 can be turned off, eliminating the load current
and dropping the supply current to 350 A.
The LT1217 is excellent for driving cables and other low
impedance loads thanks to a minimum output drive cur-
rent of 50mA. Operating on any supplies from 5V to 15V
allows the LT1217 to be used in almost any system. Like
other current feedback amplifiers, the LT1217 has high
gain bandwidth at high gains. The bandwidth is over 1MHz
at a gain of 100.
The LT1217 comes in the industry standard pinout and
can upgrade the performance of many older products.
Current Feedback Amplifier
ESCRIPTIO
–10
–20
60
50
40
30
20
10
0
100k
Voltage Gain vs Frequency
R
R
R
R
R
G
G
G
G
G
U
= 30
= 100
= 330
= 1.3k
=
Low Power 10MHz
1M
FREQUENCY (Hz)
10M
V
R
R
S
F
L
= 15V
= 3k
= 100
LT1217 • TA02
100M
LT1217
1

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LT1217 Summary of contents

Page 1

... The LT1217 is a 10MHz current feedback amplifier with DC characteristics better than many voltage feedback ampli- fiers. This versatile amplifier is fast, 280ns settling to 0.1% for a 10V step thanks to its 500V/ s slew rate. The LT1217 is manufactured on Linear Technology’s proprietary complementary bipolar process resulting in a low 1mA quiescent current ...

Page 2

... SO packaged parts (S suffix ORDER PART NUMBER 8 SHUTDOWN + LT1217CN8 OUT LT1217CS8 5 NULL S8 PART MARKING S8 PACKAGE 8-LEAD PLASTIC SOIC 1217 LT1217 • POI01 MIN TYP MAX 1 3 100 500 100 500 = 10 6 0.7 20 100 1 ...

Page 3

... R = 5.1k F 1.0 0 SUPPLY VOLTAGE ( V) LT1217 • TPC08 LT1217 = 5. LT1217 • TPC03 = 5. LT1217 • TPC06 = 250 LT1217 • TPC09 3 ...

Page 4

... Power Supply Rejection vs Frequency POSITIVE NEGATIVE V = 15V 100 = 0.01 0.1 1 FREQUENCY (MHz) LT1217 • TPC17 2nd and 3rd Harmonic Distortion vs Frequency – 15V 100 2Vpp O – 10dB V 3RD –40 2ND –50 RMS –60 100000 ...

Page 5

... SETTLING TIME (ns Feedback Resistor Selection The small signal bandwidth of the LT1217 is set by the external feedback resistors and the internal junction ca- pacitors result, the bandwidth is a function of the supply voltage, the value of the feedback resistor, the closed loop gain and load resistor. The characteristic ...

Page 6

... F tantalum capacitors be placed within 0.5 inches of the supply pins. = 4700pF Input Range The non-inverting input of the LT1217 looks like a 100M resistor in parallel with a 3pF capacitor until the common mode range is exceeded. The input impedance drops somewhat and the input current rises to about 10 A when the input comes too close to the supplies ...

Page 7

... The easy way to force shutdown is to ground pin 8, using an open collector (drain) logic stage. An internal resistor limits current, allowing direct interfacing with no addi- tional parts. When pin 8 is open, the LT1217 operates normally. Slew Rate The slew rate of a current feedback amplifier is not independent of the amplifier gain configuration the way traditional op amp ...

Page 8

... BSC : 499-3977 LT1217 • TA08 0.130 ± 0.005 0.400 (10.160) MAX 0.250 ± 0.010 0.125 0.020 (6.350 ± 0.254) (3 ...

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