LT1226CS8#TRPBF [Linear]
LT1226 - Low Noise Very High Speed Operational Amplifier; Package: SO; Pins: 8; Temperature Range: 0°C to 70°C;
| 型号： | LT1226CS8#TRPBF |
| 厂家： | 
Linear |
| 描述： | LT1226 - Low Noise Very High Speed Operational Amplifier; Package: SO; Pins: 8; Temperature Range: 0°C to 70°C 放大器 光电二极管 |
| 文件： | 总8页 (文件大小：211K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LT1226
Low Noise Very High Speed
Operational Amplifier
U
DESCRIPTIO
EATURE
S
F
■
■
■
■
■
■
■
■
■
■
■
Gain of 25 Stable
The LT1226 is a low noise, very high speed operational
amplifier with excellent DC performance. The LT1226
features low input offset voltage and high DC gain. The
circuit is a single gain stage with outstanding settling
characteristics. The fast settling time makes the circuit an
ideal choice for data acquisition systems. The output is
capableofdrivinga500Ωloadto±12Vwith ±15Vsupplies
anda150Ωloadto±3Von±5Vsupplies.Thecircuitisalso
capable of driving large capacitive loads which makes it
useful in buffer or cable driver applications.
1GHz Gain Bandwidth
400V/µs Slew Rate
2.6nV/√Hz Input Noise Voltage
50V/mV Minimum DC Gain, RL = 500Ω
1mV Maximum Input Offset Voltage
±12V Minimum Output Swing into 500Ω
Wide Supply Range ±2.5V to ±15V
7mA Supply Current
100ns Settling Time to 0.1%, 10V Step
Drives All Capacitive Loads
The LT1226 is a member of a family of fast, high per-
formance amplifiers that employ Linear Technology
Corporation’s advanced bipolar complementary
processing.
O U
PPLICATI
S
A
■
■
■
■
■
■
Wideband Amplifiers
Buffers
Active Filters
Video and RF Amplification
Cable Drivers
Data Acquisition Systems
U
O
TYPICAL APPLICATI
Photodiode Preamplifier, AV = 5.1kΩ, BW = 15MHz
Gain of +25 Pulse Response
+
V
+
LT1226
51Ω
–
5.1k
51Ω
LT1226 TA01
LT1226 TA02
1
LT1226
W W W
U
/O
ABSOLUTE AXI U RATI GS
PACKAGE RDER I FOR ATIO
Total Supply Voltage (V+ to V–) ............................... 36V
Differential Input Voltage ......................................... ±6V
Input Voltage ............................................................±VS
Output Short Circuit Duration (Note 1) ............ Indefinite
Operating Temperature Range
LT1226C................................................ 0°C to 70°C
Maximum Junction Temperature
Plastic Package .............................................. 150°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec.)................. 300°C
ORDER PART
NUMBER
TOP VIEW
1
2
3
4
NULL
–IN
8
7
6
5
NULL
LT1226CN8
LT1226CS8
+
V
OUT
NC
+IN
–
V
S8 PART MARKING
1226
N8 PACKAGE
S8 PACKAGE
8-LEAD PLASTIC DIP 8-LEAD PLASTIC SOIC
LT1226 PO01
ELECTRICAL CHARACTERISTICS VS = ±15V, TA = 25°C, VCM = 0V unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
0.3
100
4
MAX
1.0
400
8
UNITS
mV
V
Input Offset Voltage
Input Offset Current
Input Bias Current
Input Noise Voltage
Input Noise Current
Input Resistance
(Note 2)
OS
I
I
nA
OS
µA
B
e
f = 10kHz
f = 10kHz
2.6
1.5
nV/√Hz
pA/√Hz
n
i
n
R
V
= ±12V
CM
24
12
40
15
MΩ
kΩ
IN
Differential
C
Input Capacitance
Input Voltage Range +
Input Voltage Range –
Common-Mode Rejection Ratio
Power Supply Rejection Ratio
Large Signal Voltage Gain
Output Swing
2
pF
V
IN
14
–13
–12
V
CMRR
PSRR
V
= ±12V
94
103
110
150
13.3
40
dB
CM
V = ±5V to ±15V
S
94
dB
A
V
V
= ±10V, R = 500Ω
50
V/mV
±V
VOL
OUT
OUT
OUT
L
R = 500Ω
L
12.0
24
I
Output Current
V
= ±12V
mA
V/µs
MHz
GHz
ns
OUT
SR
Slew Rate
(Note 3)
250
400
6.4
1
Full Power Bandwidth
Gain Bandwidth
10V Peak, (Note 4)
f = 1MHz
GBW
t , t
Rise Time, Fall Time
Overshoot
A
A
= +25,10% to 90%, 0.1V
= +25, 0.1V
5.5
35
r
f
VCL
VCL
%
Propagation Delay
Settling Time
50% V to 50% V
5.5
100
0.7
0.6
3.1
7
ns
IN
OUT
t
10V Step, 0.1%, A = –25
ns
s
V
Differential Gain
f = 3.58MHz, A = +25, R = 150Ω
%
V
L
Differential Phase
Output Resistance
Supply Current
f = 3.58MHz, A = +25, R = 150Ω
Deg
Ω
V
L
R
A
= +25, f = 1MHz
VCL
O
I
9
mA
S
2
LT1226
ELECTRICAL CHARACTERISTICS V = ±5V, T = 25°C, V
CM = 0V unless otherwise noted.
S
A
SYMBOL
PARAMETER
CONDITIONS
(Note 2)
MIN
TYP
1.0
100
4
MAX
1.4
400
8
UNITS
mV
nA
V
Input Offset Voltage
Input Offset Current
Input Bias Current
OS
I
I
OS
µA
V
B
Input Voltage Range +
Input Voltage Range –
Common-Mode Rejection Ratio
Large Signal Voltage Gain
2.5
4
–3
–2.5
V
CMRR
V
= ±2.5V
94
50
103
dB
CM
A
V
OUT
V
OUT
= ±2.5V, R = 500Ω
= ±2.5V, R = 150Ω
100
75
V/mV
V/mV
VOL
OUT
OUT
L
L
V
Output Voltage
R = 500Ω
R = 150Ω
3.0
3.0
3.7
3.3
±V
±V
L
L
I
Output Current
Slew Rate
V
OUT
= ±3V
20
40
250
13.3
700
8
mA
V/µs
MHz
MHz
ns
SR
(Note 3)
Full Power Bandwidth
Gain Bandwidth
Rise Time, Fall Time
Overshoot
3V Peak, (Note 4)
f = 1MHz
GBW
t , t
A
VCL
A
VCL
= +25, 10% to 90%, 0.1V
= +25, 0.1V
r
f
25
8
%
Propagation Delay
Settling Time
50% V to 50% V
ns
IN
OUT
t
I
– 2.5V to 2.5V, 0.1%, A = –24
60
7
ns
s
V
Supply Current
9
mA
S
0°C ≤ TA ≤ 70°C, VCM = 0V unless otherwise noted.
ELECTRICAL CHARACTERISTICS
SYMBOL
PARAMETER
CONDITIONS
V = ±15V, (Note 2)
MIN
TYP
MAX
UNITS
V
OS
Input Offset Voltage
0.3
1.0
1.3
1.8
mV
mV
S
V = ± 5V, (Note 2)
S
Input V Drift
6
µV/°C
nA
OS
I
I
Input Offset Current
V = ±15V and V = ±5V
100
4
600
9
OS
S
S
Input Bias Current
V = ±15V and V = ±5V
µA
B
S
S
CMRR
PSRR
Common-Mode Rejection Ratio
Power Supply Rejection Ratio
Large Signal Voltage Gain
V = ±15V, V = ±12V and V = ±5V, V = ±2.5V
92
92
103
110
dB
S
CM
S
CM
V = ±5V to ±15V
S
dB
A
V = ±15V, V
= ±10V, R = 500Ω
35
35
150
100
V/mV
V/mV
VOL
OUT
OUT
S
OUT
L
V = ±5V, V
= ±2.5V, R = 500Ω
S
OUT
L
V
Output Swing
Output Current
V = ±15V, R = 500Ω
12.0
3.0
13.3
3.3
±V
±V
S
L
V = ±5V, R = 500Ω or 150Ω
S
L
I
V = ±15V, V
= ±12V
OUT
24
20
40
40
mA
mA
S
V = ±5V, V
= ±3V
S
OUT
SR
Slew Rate
V = ±15V, (Note 3)
250
400
7
V/µs
S
I
Supply Current
V = ±15V and V = ±5V
10.5
mA
S
S
S
Note 1: A heat sink may be required to keep the junction temperature
below absolute maximum when the output is shorted indefinitely.
Note 3: Slew rate is measured between ±10V on an output swing of ±12V
on ±15V supplies, and ±2V on an output swing of ±3.5V on ±5V supplies.
Note 2: Input offset voltage is tested with automated test equipment
in <1 second.
Note 4: Full power bandwidth is calculated from the slew rate
measurement: FPBW = SR/2πVp.
3
LT1226
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Input Common Mode Range vs
Supply Voltage
Output Voltage Swing vs
Supply Voltage
Supply Current vs Supply Voltage
8.0
7.5
7.0
6.5
6.0
20
15
10
5
20
15
10
5
T
= 25°C
A
L
T
= 25°C
T
= 25°C
OS
A
A
R
= 500Ω
∆V < 1mV
∆V = 30mV
OS
+V
SW
+V
–V
CM
–V
SW
CM
0
0
0
5
10
15
20
0
5
10
15
20
0
5
10
15
20
SUPPLY VOLTAGE (±V)
SUPPLY VOLTAGE (±V)
SUPPLY VOLTAGE (±V)
LT1226 TPC02
LT1226 TPC01
LT1226 TPC03
Output Voltage Swing vs
Resistive Load
Input Bias Current vs Input
Common Mode Voltage
Open Loop Gain vs
Resistive Load
30
25
20
15
10
5
120
110
100
90
5.0
4.5
4.0
3.5
3.0
T
= 25°C
OS
T
= 25°C
A
A
V
= ±15V
= 25°C
S
A
∆V = 30mV
T
I
+ I
B+ B–
I
=
V
V
= ±15V
= ±5V
B
2
S
S
V
= ±15V
S
V
= ±5V
S
80
0
70
10
100
1k
10k
10
100
1k
10k
–15
–10
–5
0
5
10
15
LOAD RESISTANCE (Ω)
LOAD RESISTANCE (Ω)
INPUT COMMON MODE VOLTAGE (V)
LT1226 TPC04
LT1226 TPC06
LT1226 TPC05
Output Short Circuit Current vs
Temperature
Supply Current vs Temperature
Input Bias Current vs Temperature
10
9
55
50
45
40
35
30
25
5.0
4.75
4.5
V
= ±15V
V
= ±5V
S
V
= ±15V
S
S
I
+ I
B+ B–
I
=
B
2
8
7
4.25
4.0
SINK
SOURCE
6
5
3.75
3.5
4
–50 –25
0
25
50
75 100 125
–50 –25
0
25
50
75 100 125
–50 –25
0
25
50
75 100 125
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
LT1226 TPC07
LT1226 TPC09
LT1226 TPC08
4
LT1226
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Power Supply Rejection Ratio vs
Common Mode Rejection Ratio vs
Frequency
Input Noise Spectral Density
Frequency
120
100
80
1000
100
10
10
120
100
V
T
= ±15V
= 25°C
V
T
= ±15V
V
T
= ±15V
= 25°C
S
A
S
A
V
S
S
A
= 25°C
= +101
= 100kΩ
A
i
R
n
1.0
0.1
0.01
80
60
–PSRR
+PSRR
60
40
20
0
40
0
e
n
1
100
10k
100k 1M
10M 100M
1k
1k
10k
100k
1M
10M
100M
10
100
1k
FREQUENCY (Hz)
10k
100k
FREQUENCY (Hz)
FREQUENCY (Hz)
LT1226 TPC11
LT1226 TPC12
LT1226 TPC10
Voltage Gain and Phase vs
Frequency
Frequency Response vs
Capacitive Load
Output Swing vs Settling Time
38
36
34
110
90
100
80
10
8
V
= ±15
S
A
V
= ±15V
= 25°C
= –25
S
A
V
V
= ±15V
T
= 25°C
S
T
C = 100pF
C = 50pF
10mV SETTLING
A
6
A
= +25
V
S
= ±5V
V
C = 0pF
4
32
30
28
26
24
22
20
18
A
V
= –25
2
0
70
60
V
S
= ±15V
V
= ±5V
S
–2
–4
–6
–8
–10
50
40
A
V
= –25
C = 1000pF
C = 500pF
30
10
20
0
A
V
= +25
60
T
= 25°C
1k
A
1M
10M
FREQUENCY (HZ)
100M
100
10k
100k 1M
10M 100M
0
20
40
80
100
120
FREQUENCY (Hz)
SETTLING TIME (ns)
LT1226 TPC15
LT1226 TPC13
LTC1226 TPC14
Closed Loop Output Impedance vs
Frequency
Gain Bandwidth vs Temperature
Slew Rate vs Temperature
100
10
1.15
1.10
1.05
1.0
500
450
400
350
V
S
A
V
= ±15V
= –25
V
= ±15V
= 25°C
= +25
V
S
= ±15V
S
A
V
T
A
–SR
+SR
1
0.95
0.90
0.85
300
250
200
0.1
0.01
1M
10M
10k
100M
100k
50
TEMPERATURE (˚C)
100 125
50
TEMPERATURE (˚C)
100 125
–50 –25
0
25
75
–50 –25
0
25
75
FREQUENCY (Hz)
LT1226 TPC16
LT1226 TPC17
LT1226 TPC18
5
LT1226
PPLICATI
O U
W
U
A
S I FOR ATIO
Small Signal, AV = +25
Small Signal, AV = –25
TheLT1226maybeinserteddirectlyintoHA2541,HA2544,
AD847, EL2020 and LM6361 applications, provided that
the amplifier configuration is a noise gain of 25 or greater,
andthenullingcircuitryisremoved.Thesuggestednulling
circuit for the LT1226 is shown below.
Offset Nulling
+
V
5k
LT1226 AI02
0.1µF
Thelargesignalresponse inbothinvertingandnoninvert-
ing gain shows symmetrical slewing characteristics. Nor-
mally the noninverting response has a much faster rising
edge due to the rapid change in input common mode
voltage which affects the tail current of the input differen-
tial pair. Slew enhancement circuitry has been added to
the LT1226 so that the falling edge slew rate is enhanced
which balances the noninverting slew rate response.
1
8
3
2
+
–
7
4
6
LT1226
0.1µF
–
V
LT1226 AI01
Layout and Passive Components
Large Signal, AV = +25
Large Signal, AV = – 25
As with any high speed operational amplifier, care must be
taken in board layout in order to obtain maximum perfor-
mance. Key layout issues include: use of a ground plane,
minimization of stray capacitance at the input pins, short
lead lengths, RF-quality bypass capacitors located close
to the device (typically 0.01µF to 0.1µF), and use of low
ESR bypass capacitors for high drive current applications
(typically 1µF to 10µF tantalum). Sockets should be
avoided when maximum frequency performance is
required, although low profile sockets can provide
reasonable performance up to 50MHz. For more details
see Design Note 50. Feedback resistors greater than 5kΩ
are not recommended because a pole is formed with the
input capacitance which can cause peaking. If feedback
resistors greater than 5kΩ are used, a parallel
capacitorof5pFto10pFshouldbeusedtocanceltheinput
pole and optimize dynamic performance.
LT1226 AI03
Input Considerations
Resistors in series with the inputs are recommended for
the LT1226 in applications where the differential input
voltage exceeds ±6V continuously or on a transient basis.
An example would be in noninverting configurations with
high input slew rates or when driving heavy capacitive
loads. The use of balanced source resistance at each input
is recommended for applications where DC accuracy
must be maximized.
Transient Response
Capacitive Loading
The LT1226 gain bandwidth is 1GHz when measured at
1MHz. The actual frequency response in a gain of +25 is
considerablyhigherthan40MHzduetopeakingcausedby
a second pole beyond the gain of 25 crossover point. This
is reflected in the small signal transient response. Higher
noisegainconfigurationsexhibitlessovershootasseenin
the inverting gain of 25 response.
The LT1226 is stable with all capacitive loads. This is
accomplished by sensing the load induced output pole
and adding compensation at the amplifier gain node. As
the capacitive load increases, both the bandwidth and
phase margin decrease so there will be peaking in the
6
LT1226
O U
W
U
PPLICATI
A
S I FOR ATIO
configurations (i.e., in a gain of 1000 it will have a
bandwidth of about 1MHz). The amplifier is stable in a
noise gain of 25 so the ratio of the output signal to the
inverting input must be 1/25 or less. Straightforward gain
configurationsof+25or–24arestable, butthereareafew
configurations that allow the amplifier to be stable for
lowersignalgains(thenoisegain, however, remains25or
more). Oneexampleistheinvertingamplifiershowninthe
typical applications sections below. The input signal has a
gain of –RF/RIN to the output, but it is easily seen that this
configuration is equivalent to a gain of –24 as far as the
amplifier is concerned. Lag compensation can also be
used to give a low frequency gain less than 25 with a high
frequency gain of 25 or greater. The example below has a
DC gain of 6, but an AC gain of +31. The break frequency
of the RC combination across the amplifier inputs should
beatleastafactorof10lessthanthegainbandwidthofthe
amplifier divided by the high frequency gain (in this case
1/10 of 1GHz/31 or 3MHz).
frequency domain and in the transient response. The
photo of the small signal response with 1000pF load
shows 55% peaking. The large signal response with a
10,000pF load shows the output slew rate being limited by
the short circuit current.
AV = –25, CL = 1000pF
AV = +25, CL = 10,000pF
LT1226 AI04
The LT1226 can drive coaxial cable directly, but for best
pulse fidelity the cable should be doubly terminated with
a resistor in series with the output.
Compensation
The LT1226 has a typical gain bandwidth product of 1GHz
which allows it to have wide bandwidth in high gain
U
O
Cable Driving
TYPICAL APPLICATI S
R3
Ω75
+
V
75Ω CABLE
IN
Lag Compensation
LT1226
V
OUT
–
R4
R1
1.2k
75Ω
V
IN
+
LT1226
V
OUT
200Ω
–
R2
50Ω
330pF
5k
LT1226 TA04
V
OS Null Loop
LT1226 TA03
1k
A
V
= +6, f < 2MHz
300k 300k
1
V
+
–
IN
8
Compensation for Lower Closed-Loop Gains
LT1226
V
OUT
R
F
25k
R
IN
V
IN
–
+
100pF
10k
10k
25Ω
LT1226
V
OUT
R
C
–
+
LT1097
LT1226 TA05
100pF
R
R
F
; R ≥ 24 × (R || R )
A
= –
F
IN
C
V
A
= 1001
LT1226 TA06
V
IN
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of circuits as described herein will not infringe on existing patent rights.
7
LT1226
W
W
SI PLIFIED SCHE ATIC
+
V
7
NULL
1
8
BIAS 1
–IN
BIAS 2
+IN
3
2
6
OUT
–
V
4
LT1226 SS
U
PACKAGE DESCRIPTIO Dimensions in inches (millimeters) unless otherwise noted.
N8 Package
8-Lead Plastic DIP
0.300 – 0.320
(7.620 – 8.128)
0.130 ± 0.005
(3.302 ± 0.127)
0.400
(10.160)
MAX
0.045 – 0.065
(1.143 – 1.651)
0.065
(1.651)
TYP
8
1
7
6
5
4
0.009 - 0.015
(0.229 - 0.381)
0.250 ± 0.010
(6.350 ± 0.254)
0.125
(3.175)
MIN
0.020
(0.508)
MIN
+0.025
–0.015
0.045 ± 0.015
(1.143 ± 0.381)
0.325
+0.635
8.255
(
)
3
2
–0.381
0.100 ± 0.010
0.018 ± 0.003
(2.540 ± 0.254)
(0.457 ± 0.076)
N8 1291
TJ MAX
θJA
150°C
130°C/W
S8 Package
8-Lead Plastic SOIC
0.189 – 0.197
(4.801 – 5.004)
7
5
8
6
0.010 – 0.020
(0.254 – 0.508)
× 45°
0.053 – 0.069
(1.346 – 1.753)
0.004 – 0.010
(0.102 – 0.254)
0.008 – 0.010
(0.203 – 0.254)
0.228 – 0.244
0.150 – 0.157
(5.791 – 6.198)
(3.810 – 3.988)
0.016 – 0.050
0.406 – 1.270
0.050
(1.270)
BSC
0.014 – 0.019
(0.356 – 0.483)
0°– 8° TYP
TJ MAX
θJA
220°C/W
1
2
3
4
S8 1291
150°C
LT/GP 0692 10K REV 0
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7487
8
●
●
(408) 432-1900 FAX: (408) 434-0507 TELEX: 499-3977
LINEAR TECHNOLOGY CORPORATION 1992
相关型号：
LT1227CS8#PBF
LT1227 - 140MHz Video Current Feedback Amplifier; Package: SO; Pins: 8; Temperature Range: 0°C to 70°C
Linear
LT1227CS8#TRPBF
LT1227 - 140MHz Video Current Feedback Amplifier; Package: SO; Pins: 8; Temperature Range: 0°C to 70°C
Linear
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