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PDF LT1223 Data sheet ( Hoja de datos )
| Número de pieza | LT1223 | |
| Descripción | 100MHz Current Feedback Amplifier | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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FEATURES
■ 100MHz Bandwidth at AV = 1
■ 1000V/µs Slew Rate
■ Wide Supply Range: ±5V to ±15V
■ 1mV Input Offset Voltage
■ 1µA Input Bias Current
■ 5MΩ Input Resistance
■ 75ns Settling Time to 0.1%
■ 50mA Output Current
■ 6mA Quiescent Current
■ Available in 8-Lead Plastic DIP and SO Packages
U
APPLICATIO S
■ Video Amplifiers
■ Buffers
■ IF and RF Amplification
■ Cable Drivers
■ 8-, 10-, 12-Bit Data Acquisition Systems
TYPICAL APPLICATIO
Video Cable Driver
VIN +
LT1223
–
RF
1k
RG
1k
75Ω
75Ω
CABLE
VOUT
75Ω
A
V
=
1
+
RF
RG
AT AMPLIFIER OUTPUT
6dB LESS AT VOUT
LT1223 • TA02
LT1223
100MHz Current
Feedback Amplifier
DESCRIPTIO
The LT®1223 is a 100MHz current feedback amplifier with
very good DC characteristics. The LT1223’s high slew
rate, 1000V/µs, wide supply range, ±15V, and large output
drive, ±50mA, make it ideal for driving analog signals over
double-terminated cables. The current feedback amplifier
has high gain bandwidth at high gains, unlike conventional
op amps.
The LT1223 comes in the industry standard pinout and
can upgrade the performance of many older products.
The LT1223 is manufactured on Linear Technology’s
proprietary complementary bipolar process.
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Voltage Gain vs Frequency
60
100MHz GAIN
50 BANDWIDTH
RG = 10
40
RG = 33
30
RG = 110
20
RG = 470
10
RG = ∞
0
+
–
1k
RG
–10
–20
100k
1M
10M 100M
1G
FREQUENCY (Hz)
LT1223 • TPC01
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1 page  
LT1223
TYPICAL PERFOR A CE CHARACTERISTICS
Supply Current vs Supply Voltage,
VIN = 0 (Operating)
10
125°C
8
25°C
6
–55°C
4
2
0
0 2 4 6 8 10 12 14 16 18 20
SUPPLY VOLTAGE (±V)
LT1223 • TPC02
Input Common Mode Limit vs
Temperature
V+
–1
–2 VS = 15V
–3
VS = 5V
–4
4
3
2 VS= ±15V
1
VS= ±5V
V–
–50 –25 0 25 50 75 100 125
TEMPERATURE (°C)
LT1223 • TPC05
VOS vs Common Mode Voltage
20
VS = ±15V
15
10
5
125°C
0
–5 25°C
–10 –55°C
–15
–20
–15 –10 –5 0 5 10 15
COMMON MODE VOLTAGE (V)
LT1223 • TPC08
Supply Current vs Supply Voltage
(Shutdown)
4
PIN 8 = 0V
3 25°C
125°C
2
–55°C
1
0
0 2 4 6 8 10 12 14 16 18 20
SUPPLY VOLTAGE (±V)
LT1223 • TPC03
Output Short Circuit-Current vs
Temperature
100
90
80
70
60
50
40
30
20
10
0
–50 –25 0 25 50 75 100 125
CASE TEMPERATURE (°C)
LT1223 • TPC04
+IB vs Common Mode Voltage
5
VS = ±15V
4
3
2 –55°C
1 25°C
0
125°C
–1
–2
–3
–4
–5
–15
–10
–5
0
5 10 15
COMMON MODE VOLTAGE (V)
LT1223 • TPC06
Output Voltage Swing vs
Load Resistor
20
VS = ±15V
15
125°C
10 25°C, –55°C
5
0
–5
–10
–15
–20
100
25°C, –55°C
125°C
1000
10000
LOAD RESISTOR (Ω)
LT1223 • TPC09
–IB vs Common Mode Voltage
10
VS = ±15V
8
6
125°C
4
2
–55°C
0
–2 25°C
–4
–6
–8
–10
–15 –10 –5 0 5 10 15
COMMON MODE VOLTAGE (V)
LT1223 ∑ TPC07
Output Voltage Swing vs
Supply Voltage
20
15
125°C
10
25°C
–55°C
5
0
–5 25°C
–10
125°C
–55°C
–15
–20
0 2 4 6 8 10 12 14 16 18 20
SUPPLY VOLTAGE (±V)
LT1223 • TPC10
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LT1223
APPLICATIO S I FOR ATIO
Summing Amplifier (DC Accurate)
The summing amplifier is easily made by adding additional
inputs to the basic inverting amplifier configuration. The
LT1223 has no IOS spec because there is no correlation
between the two input bias currents. Therefore, we will not
improve the DC accuracy of the inverting amplifier by
putting in the extra resistor in the noninverting input.
RG 1
VI1
RG 2
VI2
•
•
RG•n
VIn
+
LT1223
–
VOUT
RF
( )VOUT = –RF
VI1 + VI2 +
RG1 RG2
VIn
R Gn
LT1223 • TA07
Difference Amplifier
The LT1223 difference amplifier delivers excellent
performance if the source impedance is very low. This is
because the common mode input resistance is only equal
to RF + RG.
RG
V1
RG
V2
VOUT
=
RF
RG
(V1
–
V2)
(RF – 50)
100
+
LT1223
–
RF
OPTIONAL TRIM
FOR CMRR
VOUT
LT1223 • TA08
Video Instrumentation Amplifier
This instrumentation amplifier uses two LT1223s to in-
crease the input resistance to well over 1M. This makes an
excellent “loop through” or cable sensing amplifier if the
inverting input (A1) senses the shield and the non-invert-
ing input (A2) senses the center conductor. Since this
amplifier does not load the cable (take care to minimize
stray capacitance) and it rejects common mode hum and
noise, several amplifiers can sense the signal with only
one termination at the end of the cable. The design
equations are simple. Just select the gain you need (it
should be two or more) and the value of the feedback
resistor (typically 1k) and calculate RG1 and RG2. The gain
can be tweaked with RG2 and the CMRR with RG1 if needed.
The bandwidth of the noninverting input signal is not
reduced by the presence of the other amplifier, however,
the inverting input signal bandwidth is reduced since it
passes two amplifiers. The CMRR is good at high frequen-
cies because the bandwidth of the amplifiers are about the
same even though they do not necessarily operate at the
same gain.
RG1 RF1
1k 1k
RG2
1k
RF2
1k
–
A1
LT1223
+
–
A2
LT1223
+
VOUT
VIN –
VIN+
VOUT
RF1 =
= G (VIN+
RF2; RG1
–
=
VIN–)
(G – 1)
RF2;
RG2
=
RF2
G–1
TRIM GAIN (G) WITH RG2; TRIM CMRR WITH RG1
LT1223 • TA09
Cable Driver
The cable driver circuit is shown on the front page. When
driving a cable it is important to properly terminate both
ends if even modest high frequency performance is
required. The additional advantage of this is that it isolates
the capacitive load of the cable from the amplifier so it can
operate at maximum bandwidth.
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11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LT1223.PDF ] | |
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