LT1800CS5#TR [Linear]
LT1800 - 80MHz, 25V/µs Low Power Rail-to-Rail Input and Output Precision Op Amp; Package: SOT; Pins: 5; Temperature Range: 0°C to 70°C;型号: | LT1800CS5#TR |
厂家: | Linear |
描述: | LT1800 - 80MHz, 25V/µs Low Power Rail-to-Rail Input and Output Precision Op Amp; Package: SOT; Pins: 5; Temperature Range: 0°C to 70°C 放大器 光电二极管 |
文件: | 总18页 (文件大小:278K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
LT1800
80MHz, 25V/µs Low Power
Rail-to-Rail Input and Output
Precision Op Amp
FEATURES
DESCRIPTION
TheLT®1800isalowpower,highspeedrail-to-railinputand
outputoperationalamplifierwithexcellentDCperformance.
The LT1800 features reduced supply current, lower input
offset voltage, lower input bias current and higher DC gain
than other devices with comparable bandwidth.
n
Gain Bandwidth Product: 80MHz
n
Input Common Mode Range Includes Both Rails
n
Output Swings Rail-to-Rail
n
Low Quiescent Current: 2mA Max
n
Input Offset Voltage: 350μV Max
n
Input Bias Current: 250nA Max
The LT1800 has an input range that includes both supply
rails and an output that swings within 20mV of either
supply rail to maximize the signal dynamic range in low
supply applications.
n
Low Voltage Noise: 8.5nV/√Hz
n
Slew Rate: 25V/μs
n
Common Mode Rejection: 105dB
n
Power Supply Rejection: 97dB
The LT1800 maintains its performance for supplies from
2.3V to 12.6V and is specified at 3V, 5V and 5V supplies.
The inputs can be driven beyond the supplies without
damage or phase reversal of the output.
n
Open-Loop Gain: 85V/mV
n
Operating Temperature Range: –40°C to 85°C
n
Available in the 8-Pin SO and 5-Pin Low Profile
(1mm) ThinSOT™ Packages
The LT1800 is available in the 8-pin SO package with
the standard op amp pinout and in the 5-pin TSOT-23
package. For dual and quad versions of the LT1800, see
the LT1801/LT1802 data sheet. The LT1800 can be used
as a plug-in replacement for many op amps to improve
input/output range and performance.
APPLICATIONS
n
Low Voltage, High Frequency Signal Processing
n
Driving A/D Converters
n
Rail-to-Rail Buffer Amplifiers
n
Active Filters
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. ThinSOT is a trademark of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
n
Video Line Driver
TYPICAL APPLICATION
Single Supply 1A Laser Driver Amplifier
Laser Driver Amplifier 500mA Pulse Response
5V
+
V
IN
R3
DO NOT FLOAT
Q1
ZETEX
FMMT619
10Ω
LT1800
100mA/DIV
–
C1
39pF
IR LASER
INFINEON
SFH495
R2
330Ω
R1
1Ω
1800 TA01a
1800 TA01b
50ns/DIV
1800fa
1
LT1800
ABSOLUTE MAXIMUM RATINGS (Note 1)
–
+
Specified Temperature Range (Note 5) ....–40°C to 85°C
Junction Temperature ........................................... 150°C
Storage Temperature Range...................–65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
Total Supply Voltage (V to V ) ..........................12.6V
S
S
Input Current (Note 2).......................................... 10mA
Output Short-Circuit Duration (Note 3) ............ Indefinite
Operating Temperature Range (Note 4)....–40°C to 85°C
PIN CONFIGURATION
TOP VIEW
TOP VIEW
+
NC
1
2
3
4
8
7
6
5
NC
–
+
V
1
2
5 V
S
OUT
–
+
–IN
V
V
S
V
S
+
–
+IN
–
OUT
+IN 3
4 –IN
V
S
NC
S5 PACKAGE
5-LEAD PLASTIC TSOT-23
S8 PACKAGE
8-LEAD PLASTIC SO
T
JMAX
= 150°C, θ = 250°C/W
JA
T
= 150°C, θ = 190°C/W
JA
JMAX
ORDER INFORMATION
LEAD FREE FINISH
LT1800CS8#PBF
LT1800IS8#PBF
LT1800CS5#PBF
LT1800IS5#PBF
TAPE AND REEL
PART MARKING
1800
PACKAGE DESCRIPTION
8-Lead Plastic SO
SPECIFIED TEMPERATURE RANGE
LT1800CS8#TRPBF
LT1800IS8#TRPBF
LT1800CS5#TRPBF
LT1800IS5#TRPBF
0°C to 70°C
1800I
8-Lead Plastic SO
–40°C to 85°C
0°C to 70°C
LTRN
5-Lead Plastic TSOT-23
5-Lead Plastic TSOT-23
LTRP
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
ELECTRICAL CHARACTERISTICS
TA = 25°C. VS = 5V, 0V; VS = 3V, 0V; VCM = VOUT = half supply, unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
Input Offset Voltage
V
CM
V
CM
V
CM
V
CM
= 0V
75
300
0.5
0.7
350
750
3
μV
μV
mV
mV
OS
= 0V (SOT-23)
= V
S
= V (SOT-23)
3.5
S
Input Offset Shift
Input Bias Current
V
= 0V to V – 1.5V
20
180
μV
ΔV
CM
S
OS
I
B
V
CM
V
CM
= 1V
25
500
250
1500
nA
nA
= V
S
I
Input Offset Current
Input Noise Voltage
V
V
= 1V
25
25
200
200
nA
nA
OS
CM
CM
= V
S
0.1Hz to 10Hz
1.4
μV
P-P
1800fa
2
LT1800
ELECTRICAL CHARACTERISTICS
TA = 25°C. VS = 5V, 0V; VS = 3V, 0V; VCM = VOUT = half supply, unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
f = 10kHz
MIN
TYP
8.5
1
MAX
UNITS
nV/√Hz
pA/√Hz
pF
e
n
Input Noise Voltage Density
Input Noise Current Density
Input Capacitance
i
f = 10kHz
n
C
f = 100kHz
2
IN
A
VOL
Large-Signal Voltage Gain
V = 5V, V = 0.5V to 4.5V, R = 1k at V /2
35
3.5
30
85
8
85
V/mV
V/mV
V/mV
S
O
L
S
V = 5V, V = 1V to 4V, R = 100Ω at V /2
S
O
L
S
V = 3V, V = 0.5V to 2.5V, R = 1k at V /2
S
O
L
S
CMRR
Common Mode Rejection Ratio
V = 5V, V = 0V to 3.5V
85
78
105
97
dB
dB
S
CM
V = 3V, V = 0V to 1.5V
S
CM
Input Common Mode Range
Power Supply Rejection Ratio
Minimum Supply Voltage (Note 6)
0
V
V
dB
V
S
PSRR
V = 2.5V to 10V, V = 0V
80
97
S
CM
2.3
2.5
V
Output Voltage Swing Low (Note 7) No Load
12
80
50
mV
mV
mV
OL
OH
I
I
= 5mA
160
450
SINK
SINK
= 20mA
225
V
Output Voltage Swing High (Note 7) No Load
16
120
450
60
250
850
mV
mV
mV
I
I
= 5mA
SOURCE
SOURCE
= 20mA
I
I
Short-Circuit Current
V = 5V
S
20
20
45
40
mA
mA
SC
S
V = 3V
Supply Current per Amplifier
Gain Bandwidth Product
Slew Rate
1.6
80
2
mA
MHz
V/μs
MHz
dBc
ns
S
GBW
SR
Frequency = 2MHz
40
13
V = 5V, A = –1, R = 1k, V = 4V
S
25
V
L
O
FPBW
HD
Full Power Bandwidth
Harmonic Distortion
Settling Time
V = 5V, V
S
= 4V
2
OUT
P-P
V = 5V, A = 1, R = 1k, V = 2V , f = 500kHz
S
–75
250
0.35
0.4
V
L
O
P-P C
t
0.01%, V = 5V, V
= 2V, A = 1, R = 1k
STEP V L
S
S
Differential Gain (NTSC)
Differential Phase (NTSC)
V = 5V, A = +2, R = 150Ω
S
%
ΔG
V
L
V = 5V, A = +2, R = 150Ω
S
Deg
Δθ
V
L
The l denotes the specifications which apply over the temperature range of 0°C ≤ TA ≤ 70°C. VS = 5V, 0V; VS = 3V, 0V;
CM = VOUT = half supply, unless otherwise noted.
V
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
l
l
l
l
V
Input Offset Voltage
V
CM
V
CM
V
CM
V
CM
= 0V
125
300
0.6
0.7
500
1250
3.5
μV
μV
mV
mV
OS
= 0V (SOT-23)
= V
S
= V (SOT-23)
3.75
S
l
l
Input Offset Shift
V
= 0V to V – 1.5V
30
275
5
μV
ΔV
CM
S
OS
V
TC
Input Offset Voltage Drift (Note 8)
Input Bias Current
1.5
μV/°C
OS
l
l
I
B
V
CM
V
CM
= 1V
50
550
300
1750
nA
nA
= V – 0.2V
S
l
l
I
OS
Input Offset Current
V
CM
V
CM
= 1V
25
25
250
250
nA
nA
= V – 0.2V
S
l
l
l
A
Large-Signal Voltage Gain
V = 5V, V = 0.5V to 4.5V, R = 1k at V /2
30
3
25
75
6
75
V/mV
V/mV
V/mV
VOL
S
O
L
S
V = 5V, V = 1V to 4V, R = 100Ω at V /2
S
O
L
S
V = 3V, V = 0.5V to 2.5V, R = 1k at V /2
S
O
L
S
l
l
CMRR
Common Mode Rejection Ratio
V = 5V, V = 0V to 3.5V
82
74
101
93
dB
dB
S
CM
V = 3V, V = 0V to 1.5V
S
CM
1800fa
3
LT1800
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the temperature range of
0°C ≤ TA ≤ 70°C. C. VS = 5V, 0V; VS = 3V, 0V; VCM = VOUT = half supply, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
0
TYP
MAX
UNITS
l
l
l
Input Common Mode Range
Power Supply Rejection Ratio
Minimum Supply Voltage (Note 6)
Output Voltage Swing Low (Note 7)
V
S
V
dB
V
PSRR
V = 2.5V to 10V, V = 0V
S
74
91
CM
2.3
2.5
l
l
l
V
No Load
14
100
300
60
200
550
mV
mV
mV
OL
OH
I
I
= 5mA
= 20mA
SINK
SINK
l
l
l
V
Output Voltage Swing High (Note 7)
Short-Circuit Current
No Load
25
150
600
80
mV
mV
mV
I
I
= 5mA
300
SOURCE
SOURCE
= 20mA
1000
l
l
I
I
V = 5V
20
20
40
30
mA
mA
SC
S
V = 3V
S
l
l
l
Supply Current per Amplifier
Gain Bandwidth Product
Slew Rate
2
2.75
mA
MHz
V/μs
S
GBW
SR
Frequency = 2MHz
V = 5V, A = – 1, R = 1k, V = 4V
P-P
35
11
75
22
S
V
L
O
The l denotes the specifications which apply over the temperature range of –40°C ≤ TA ≤ 85°C. VS = 5V, 0V; VS = 3V, 0V; VCM = VOUT
half supply, unless otherwise noted.
=
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
l
l
l
l
V
Input Offset Voltage
V
CM
V
CM
V
CM
V
CM
= 0V
175
400
0.75
0.9
700
2000
4
μV
μV
mV
mV
OS
= 0V (SOT-23)
= V
S
= V (SOT-23)
4
S
l
l
Input Offset Shift
V
= 0V to V – 1.5V
30
300
5
μV
ΔV
CM
S
OS
V
OS
TC
Input Offset Voltage Drift (Note 8)
Input Bias Current
1.5
μV/°C
l
l
I
B
V
CM
V
CM
= 1V
50
600
400
2000
nA
nA
= V – 0.2V
S
l
l
I
OS
Input Offset Current
V
CM
V
CM
= 1V
25
25
300
300
nA
nA
= V – 0.2V
S
l
l
l
A
VOL
Large-Signal Voltage Gain
V = 5V, V = 0.5V to 4.5V, R = 1k at V /2
25
2.5
20
65
6
65
V/mV
V/mV
V/mV
S
O
L
S
V = 5V, V = 1.5V to 3.5V, R = 100Ω at V /2
S
O
L
S
V = 3V, V = 0.5V to 2.5V, R = 1k at V /2
S
O
L
S
l
l
CMRR
PSRR
Common Mode Rejection Ratio
V = 5V, V = 0V to 3.5V
81
73
101
93
dB
dB
S
CM
V = 3V, V = 0V to 1.5V
S
CM
l
l
l
Input Common Mode Range
0
V
V
dB
V
S
Power Supply Rejection Ratio
Minimum Supply Voltage (Note 6)
Output Voltage Swing Low (Note 7)
V = 2.5V to 10V, V = 0V
73
90
S
CM
2.3
2.5
l
l
l
V
No Load
15
105
170
70
210
400
mV
mV
mV
OL
OH
I
I
= 5mA
= 10mA
SINK
SINK
l
l
l
V
Output Voltage Swing High (Note 7)
Short-Circuit Current
No Load
25
150
300
90
350
700
mV
mV
mV
I
I
= 5mA
SOURCE
SOURCE
= 10mA
l
l
I
I
V = 5V
12.5
12.5
30
30
mA
mA
SC
S
V = 3V
S
l
l
l
Supply Current per Amplifier
Gain Bandwidth Product
Slew Rate
2.1
70
18
3
mA
S
GBW
SR
Frequency = 2MHz
V = 5V, A = – 1, R = 1k, V = 4V
30
10
MHz
V/μs
S
V
L
O
1800fa
4
LT1800
ELECTRICAL CHARACTERISTICS
TA = 25°C, VS = 5V, VCM = 0V, VOUT = 0V, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
–
–
V
Input Offset Voltage
V
CM
V
CM
V
CM
V
CM
= V
S
150
400
0.7
1
500
1000
3.5
μV
μV
mV
mV
OS
= V (SOT-23)
S
S
+
+
= V
= V (SOT-23)
4.5
S
–
+
Input Offset Shift
Input Bias Current
V
= V to V – 1.5V
30
475
μV
ΔV
CM
S
S
OS
–
I
V
CM
V
CM
= V + 1V
25
400
350
1500
nA
nA
B
S
+
= V
S
–
+
I
OS
Input Offset Current
V
CM
V
CM
= V + 1V
20
20
250
250
nA
nA
S
= V
S
Input Noise Voltage
0.1Hz to 10Hz
f = 10kHz
1.4
8.5
1
μV
P-P
e
n
Input Noise Voltage Density
Input Noise Current Density
Input Capacitance
nV/√Hz
pA/√Hz
pF
i
f = 10kHz
n
C
f = 100kHz
2
IN
A
VOL
Large-Signal Voltage Gain
V = –4V to 4V, R = 1k
25
2.5
70
7
V/mV
V/mV
O
L
V = –2V to 2V, R = 100ꢀ
O
L
–
CMRR
Common Mode Rejection Ratio
Input Common Mode Range
V
V
= V to 3.5V
85
109
dB
V
CM
S
–
+
V
S
V
S
+
–
PSRR
Power Supply Rejection Ratio
Output Voltage Swing Low (Note 7)
= 2.5V to 10V, V = 0V
80
97
dB
S
S
V
OL
No Load
15
85
225
60
170
450
mV
mV
mV
I
I
= 5mA
= 20mA
SINK
SINK
V
Output Voltage Swing High (Note 7)
No Load
17
130
450
70
260
900
mV
mV
mV
OH
I
I
= 5mA
SOURCE
SOURCE
= 20mA
I
I
Short-Circuit Current
Supply Current per Amplifier
Gain Bandwidth Product
Slew Rate
30
50
1.8
70
mA
mA
SC
2.75
S
GBW
SR
Frequency = 2MHz
A = – 1, R = 1k, V = 4V, Measured at V = 2V
MHz
V/μs
MHz
dBc
ns
23
V
L
O
O
FPBW
HD
Full Power Bandwidth
Harmonic Distortion
Settling Time
V = 8V
0.9
–75
300
0.35
0.2
O
P-P
A = 1, R = 1k, V = 2V , f = 500kHz
V
L
O
P-P C
t
0.01%, V = 5V, A = 1V, R = 1k
STEP V L
S
Differential Gain (NTSC)
Differential Phase (NTSC)
A = + 2, R = 150Ω
%
ΔG
V
L
A = + 2, R = 150Ω
Deg
Δθ
V
L
The l denotes the specifications which apply over the temperature range of 0°C ≤ TA ≤ 70°C. VS = 5V, VCM = 0V, VOUT = 0V, unless
otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
–
–
l
l
l
l
V
Input Offset Voltage
V
CM
V
CM
V
CM
V
CM
= V
S
200
450
0.75
1
800
1500
4
μV
μV
mV
mV
OS
= V (SOT-23)
S
S
+
+
= V
= V (SOT-23)
5
S
–
+
l
l
Input Offset Shift
V
= V to V – 1.5V
45
675
5
μV
ΔV
CM
S
S
OS
V
TC
Input Offset Voltage Drift (Note 8)
Input Bias Current
1.5
μV/°C
OS
–
I
V
CM
V
CM
= V + 1V
l
l
30
450
400
1750
nA
nA
B
S
S
+
= V – 0.2V
1800fa
5
LT1800
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the temperature range of
0°C ≤ TA ≤ 70°C. VS = 5V, VCM = 0V, VOUT = 0V, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
–
+
l
l
I
Input Offset Current
V
CM
V
CM
= V + 1V
25
25
300
300
nA
nA
OS
S
= V – 0.2V
S
l
l
A
VOL
Large-Signal Voltage Gain
V = –4V to 4V, R = 1k
20
2
55
5
V/mV
V/mV
O
L
V = –2V to 2V, R = 100Ω
O
L
–
l
l
l
CMRR
Common Mode Rejection Ratio
Input Common Mode Range
V
V
= V to 3.5V
82
105
dB
V
CM
S
–
+
V
V
S
S
+
–
PSRR
Power Supply Rejection Ratio
Output Voltage Swing Low (Note 7)
= 2.5V to 10V, V = 0V
74
91
dB
S
S
l
l
l
V
V
No Load
17
105
250
70
210
575
mV
mV
mV
OL
OH
I
I
= 5mA
= 20mA
SINK
SINK
l
l
l
Output Voltage Swing High (Note 7)
No Load
25
150
600
90
mV
mV
mV
I
I
= 5mA
= 20mA
310
SOURCE
SOURCE
1100
l
l
l
l
I
I
Short-Circuit Current
Supply Current per Amplifier
Gain Bandwidth Product
Slew Rate
25
45
2.4
70
20
mA
mA
SC
3.5
S
GBW
SR
Frequency = 2MHz
A = –1, R = 1k, V = 4V, Measured at V = 2V
MHz
V/μs
V
L
O
O
The l denotes the specifications which apply over the temperature range of –40°C ≤ TA ≤ 85°C. VS = 5V, VCM = 0V, VOUT = 0V, unless
otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
–
–
l
l
l
l
V
Input Offset Voltage
V
CM
V
CM
V
CM
V
CM
= V
S
350
500
0.75
1
900
2250
4.5
μV
μV
mV
mV
OS
= V (SOT-23)
S
S
S
= V +
= V + (SOT-23)
5.5
–
+
l
l
Input Offset Shift
V
= V to V – 1.5V
50
750
5
μV
ΔV
CM
S
S
OS
V
TC
Input Offset Voltage Drift (Note 8)
Input Bias Current
1.5
μV/°C
OS
–
l
l
I
B
V
V
= V + 1V
50
450
450
2000
nA
nA
CM
CM
S
S
= V + – 0.2V
–
l
l
I
Input Offset Current
V
CM
V
CM
= V + 1V
25
25
350
350
nA
nA
OS
S
= V + – 0.2V
S
l
l
A
VOL
Large-Signal Voltage Gain
V = –4V to 4V, R = 1k
16
2
55
5
V/mV
V/mV
O
L
V = –1V to 1V, R = 100ꢀ
O
L
–
l
l
l
CMRR
Common Mode Rejection Ratio
Input Common Mode Range
Power Supply Rejection Ratio
V
V
= V to 3.5V
81
104
dB
V
CM
S
–
+
V
V
S
S
+
–
PSRR
= 2.5V to 10V, V = 0V
73
90
dB
S
S
l
l
l
V
V
Output Voltage Swing Low (Note 7) No Load
15
80
mV
mV
mV
OL
OH
I
I
= 5mA
105
170
220
400
SINK
SINK
= 10mA
l
l
l
Output Voltage Swing High (Note 7) No Load
25
150
300
100
350
700
mV
mV
mV
I
I
= 5mA
SOURCE
SOURCE
= 10mA
l
l
l
l
I
I
Short-Circuit Current
Supply Current per Amplifier
Gain Bandwidth Product
Slew Rate
12.5
30
2.6
65
15
mA
mA
SC
4
S
GBW
SR
Frequency = 2MHz
A = –1, R = 1k, V = 4V, Measured at V = 2V
MHz
V/μs
V
L
O
O
1800fa
6
LT1800
ELECTRICAL CHARACTERISTICS
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The inputs are protected by back-to-back diodes and by ESD
diodes to the supply rails. If the differential input voltage exceeds 1.4V or
either input goes outside the rails, the input current should be limited to
less than 10mA.
Note 4: The LT1800C/LT1800I are guaranteed functional over the
temperature range of –40°C to 85°C.
Note 5: The LT1800C is guaranteed to meet specified performance from
0°C to 70°C. The LT1800C is designed, characterized and expected to
meet specified performance from –40°C to 85°C but is not tested or
QA sampled at these temperatures. The LT1800I is guaranteed to meet
specified performance from –40°C to 85°C.
Note 6: Minimum supply voltage is guaranteed by power supply rejection
Note 3: A heat sink may be required to keep the junction temperature
below the absolute maximum rating when the output is shorted
indefinitely.
ratio test.
Note 7: Output voltage swings are measured between the output and
power supply rails.
Note 8: This parameter is not 100% tested.
TYPICAL PERFORMANCE CHARACTERISTICS
VOS Distribution, VCM = 0V
(SO-8, PNP Stage)
VOS Distribution, VCM = 5V
(SO-8, NPN Stage)
VOS Distribution, VCM = 0V
(SOT-23, PNP Stage)
40
35
30
25
20
15
10
5
45
40
35
30
25
20
15
10
5
45
40
35
30
25
20
15
10
5
V
V
= 5V, 0V
= 0V
V
V
= 5V, 0V
= 5V
V
V
= 5V, 0V
= 0V
S
CM
S
CM
S
CM
0
0
–250
0
–1250
–750
–250
250
750
1250
–150
–50
250
50
150
–2000 –1200
–400
2000
400
1200
INPUT OFFSET VOLTAGE (μV)
INPUT OFFSET VOLTAGE (μV)
INPUT OFFSET VOLTAGE (μV)
1800 G03
1800 G01
1800 G02
VOS Distribution, VCM = 5V
(SOT-23, NPN Stage)
Offset Voltage
vs Input Common Mode Voltage
Supply Current vs Supply Voltage
35
30
500
400
4
3
2
1
0
V
= 5V, 0V
V
V
= 5V, 0V
CM
S
S
T
= –55°C
A
TYPICAL PART
= 5V
300
T
T
= 125°C
A
T
A
25
200
T
= 25°C
A
100
20
15
10
5
= 25°C
A
0
–100
–200
–300
–400
–500
= –55°C
T
= 125°C
2
A
0
–2500 –1500 –500
500
1500
2500
0
1
2
3
4
5
6
7
8
9
10 11 12
0
1
3
4
5
INPUT OFFSET VOLTAGE (μV)
TOTAL SUPPLY VOLTAGE (V)
INPUT COMMON MODE VOLTAGE (V)
1800 G04
1800 G05
1800 G06
1800fa
7
LT1800
TYPICAL PERFORMANCE CHARACTERISTICS
Input Bias Current
vs Common Mode Voltage
Input Bias Current
vs Temperature
Output Saturation Voltage
vs Load Current (Output Low)
10
1
1.0
0.8
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
V
= 5V, 0V
V
= 5V, 0V
S
S
T
T
T
= 25°C
A
A
A
= 125°C
= –55°C
NPN ACTIVE
0.6
V
V
= 5V, 0V
S
CM
0.4
= 5V
0.2
0.1
0
–0.2
–0.4
–0.6
–0.8
–1.0
T
A
= 125°C
A
PNP ACTIVE
0.01
0.001
V
V
= 5V, 0V
CM
S
T
= –55°C
T
= 25°C
1
A
= 1V
–0.1
–1
0
1
2
3
4
5
6
0.01
0.1
10
100
–60 –40 –20
0
20
40
60
80
LOAD CURRENT (mA)
INPUT COMMON MODE VOLTAGE (V)
TEMPERATURE (°C)
1800 G09
1800 G07
1800 G08
Output Saturation Voltage
Output Short-Circuit Current
vs Power Supply Voltage
vs Load Current (Output High)
Minimum Supply Voltage
10
1
70
60
50
40
30
20
10
0
–10
–20
–30
–40
–50
–60
–70
0.6
V
= 5V, 0V
T
= 25°C
S
A
T
= –55°C
A
0.4
0.2
T
= 125°C
A
T
= –55°C
SINKING
= 5V, 0V
A
A
T
= 25°C
A
V
S
0.1
0
T
= 125°C
= –55°C
A
T
= –55°C
= 125°C
SOURCING
–0.2
T
= 125°C
A
0.01
0.001
T
A
T
= 25°C
1
T
A
A
–0.4
–0.6
T
= 25°C
A
0.01
0.1
10
100
0
1.5
2
2.5
3
3.5
4
4.5
5
5.5
1.5
2
2.5
3
3.5
4
4.5
5
LOAD CURRENT (mA)
TOTAL SUPPLY VOLTAGE (V)
POWER SUPPLY VOLTAGE ( V)
1800 G10
1800 G11
1800 G12
Open-Loop Gain
Open-Loop Gain
Open-Loop Gain
2000
1600
1200
800
2000
1600
1200
800
2000
1600
1200
800
V
= 3V, 0V
TO GND
V
= 5V, 0V
TO GND
V
=
5V
R TO GND
L
S
L
S
L
S
R
R
400
400
400
R
= 1k
L
R
= 1k
R
= 1k
L
L
0
0
0
–400
–800
–1200
–1600
–2000
–400
–800
–1200
–1600
–2000
–400
–800
–1200
–1600
–2000
R
= 100ꢀ
L
R
L
= 100ꢀ
R
= 100Ω
L
0
0.5
1.5
2
2.5
3
1
0.5
1
3
3.5
4.5
–4 –3
1
2
4
0
1.5
2
2.5
4
5
–5
–2 –1
0
3
5
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
1800 G13
1800 G14
1800 G15
1800fa
8
LT1800
TYPICAL PERFORMANCE CHARACTERISTICS
Warm-Up Drift
Offset Voltage vs Output Current
vs Time (LT1800S8)
Input Noise Voltage vs Frequency
60
120
110
100
90
2.0
1.5
V
= 5V, 0V
V
= 5V
S
S
V
=
5V
S
50
40
1.0
T
= –55°C
A
0.5
V
=
2.5V
1.5V
NPN ACTIVE
= 4.25V
S
S
80
30
20
0
V
CM
70
–0.5
–1.0
–1.5
–2.0
T
= 25°C
A
T
= 125°C
A
60
V
=
10
0
50
PNP ACTIVE
= 2.5V
V
CM
TYPICAL PART
40
20
40
80 100 120 140
0
60
0.01
0.1
1
FREQUENCY (kHz)
10
100
0
15
–60 –45 –30 –15
30 45 60
TIME AFTER POWER-UP (SECONDS)
OUTPUT CURRENT (mA)
1800 G18
1800 G17
1800 G16
0.1Hz to 10Hz Output Voltage
Noise
Input Current Noise vs Frequency
3.0
2000
1000
0
V
= 5V, 0V
S
2.5
2.0
PNP ACTIVE
= 2.5V
1.5
1.0
V
CM
–1000
–2000
NPN ACTIVE
= 4.25V
0.5
0
V
CM
0
1
2
3
4
5
6
7
8
9
10
0.01
0.1
1
FREQUENCY (kHz)
10
100
TIME (SECONDS)
1800 G19
1800 G20
Gain Bandwidth and Phase
Margin vs Supply Voltage
Gain Bandwidth and Phase
Margin vs Temperature
100
90
80
70
60
50
100
90
T
= 25°C
GBW PRODUCT
2.5V
A
V
=
S
GAIN BANDWIDTH
PRODUCT
80
GBW PRODUCT
5V
V
=
S
70
PHASE MARGIN
2.5V
60
50
40
30
20
10
60
60
50
40
30
20
V
=
S
PHASE MARGIN
PHASE MARGIN
5V
V
=
S
–55 –35 –15
5
25 45 65 85 105 125
0
1
2
3
4
5
6
7
8
9
10
TEMPERATURE (°C)
TOTAL SUPPLY VOLTAGE (V)
1800 G22
1800 G21
1800fa
9
LT1800
TYPICAL PERFORMANCE CHARACTERISTICS
Slew Rate vs Temperature
Gain and Phase vs Frequency
70
60
50
40
100
80
35
30
A
R
R
= –1
G
= 1k
V
F
L
= R = 1k
V
=
2.5V
5V
S
PHASE
60
40
30
20
20
0
25
V
=
S
GAIN
10
0
–20
–40
–60
–80
–100
20
15
10
–10
–20
–30
V
V
=
=
2.5V
5V
S
S
0.01
0.1
1
10
100 300
–55 –35 –15
5
25 45 65 85 105 125
TEMPERATURE (oC)
FREQUENCY (MHz)
1800 G24
1800 G23
Gain vs Frequency (AV = 1)
Gain vs Frequency (AV = 2)
Output Impedance vs Frequency
600
100
12
9
18
15
12
9
R
C
V
= 1k
= 10pF
= 2
V = 2.5V
S
R
C
V
= 1k
= 10pF
= 1
L
L
L
L
A
A
6
A
= 10
V
10
1
3
V
= 2.5V
S
A
= 1
V
0
6
V
=
2.5V
V
= 5V
S
S
A
= 2
V
–3
–6
–9
–12
3
0.1
V
= 5V
S
0
0.01
0.001
–3
–6
0.1
1
10
FREQUENCY (MHz)
100
500
0.1
1
10
100 300
0.1
1
10
100 300
FREQUENCY (MHz)
FREQUENCY (MHz)
1800 G25
1800 G26
1800 G27
Common Mode Rejection Ratio
vs Frequency
Power Supply Rejection Ratio
vs Frequency
Series Output Resistor
vs Capacitive Load
90
80
70
60
60
55
50
45
40
35
30
25
20
15
10
5
120
V
T
= 5V, 0V
= 25°C
V
A
= 5V, 0V
= 1
V
= 5V, 0V
S
A
S
V
S
100
80
NEGATIVE
SUPPLY
POSITIVE
SUPPLY
R
= 10Ω
OS
50
40
60
40
R
= 20Ω
OS
30
20
10
20
0
R
= R = 50Ω
L
OS
0
–10
0
0.001
0.01
0.1
1
10
100
10
100
1000
10000
0.01
0.1
1
10
100
FREQUENCY (MHz)
FREQUENCY (MHz)
CAPACITIVE LOAD (pF)
1800 G29
1800 G30
1800 G28
1800fa
10
LT1800
TYPICAL PERFORMANCE CHARACTERISTICS
Series Output Resistor
vs Capacitive Load
Distortion vs Frequency
Distortion vs Frequency
–40
–50
–40
–50
60
55
50
45
40
35
30
25
20
15
10
5
V
A
V
= 5V, 0V
= 1
V
A
V
= 5V, 0V
= 2
V
A
= 5V, 0V
= 2
S
V
S
V
S
V
= 2V
= 2V
OUT
P-P
OUT
P-P
R
= 1k,
L
–60
–60
2ND
R
L
= 1507, 2ND
R
L
= 150Ω, 2ND
R
= 1k, 2ND
L
R
3RD
= 150Ω,
–70
–70
L
R
= 150Ω, 3RD
L
R
= 10Ω
OS
–80
–80
R
= 20Ω
–90
–90
OS
–100
–100
R
L
= 1k, 3RD
R
= 1k, 3RD
L
R
= R = 50Ω
L
OS
–110
–110
0
0.01
0.1
1
10
0.01
0.1
1
10
10
100
1000
10000
FREQUENCY (MHz)
FREQUENCY (MHz)
CAPACITIVE LOAD (pF)
1800 G32
1800 G33
1800 G31
Maximum Undistorted Output
Signal vs Frequency
5V Large-Signal Response
5V Small-Signal Response
4.6
4.5
4.4
4.3
4.2
4.1
4.0
3.9
50mV/DIV
0V
A
= 2
V
1V/DIV
0V
A
= –1
V
1800 G35
1800 G36
V
= 5V, 0V
= 1k
V
A
= 5V, 0V
= 1
= 1k
100ns/DIV
V
A
= 5V, 0V
= 1
= 1k
50ns/DIV
S
L
S
V
S
V
R
R
R
L
L
1k
10k
100k
FREQUENCY (Hz)
1M
10M
1800 G34
5V Large-Signal Response
5V Small-Signal Response
Output Overdriven Recovery
V
IN
1V/DIV
50mV/DIV
0V
2V/DIV
0V
0V
V
OUT
2V/DIV
0V
1800 G38
1800 G39
1800 G37
V
A
=
5V
50ns/DIV
V
A
= 5V, 0V
= 2
= 1k
100ns/DIV
V
A
=
5V
200ns/DIV
S
V
L
S
V
L
S
V
L
= 1
= 1
R
= 1k
R
R
= 1k
1800fa
11
LT1800
APPLICATIONS INFORMATION
Circuit Description
ApairofcomplementarycommonemitterstagesQ14/Q15
that enable the output to swing from rail to rail constructs
the output stage. The capacitors C2 and C3 form the lo-
cal feedback loops that lower the output impedance at
high frequency. These devices are fabricated on Linear
Technology’s proprietary high speed complementary
bipolar process.
The LT1800 has an input and output signal range that cov-
ers from the negative power supply to the positive power
supply. Figure 1 depicts a simplified schematic of the
amplifier. The input stage is comprised of two differential
amplifiers, a PNP stage Q1/Q2 and an NPN stage Q3/Q4
that are active over the different ranges of common mode
inputvoltage.ThePNPdifferentialpairisactivebetweenthe
negative supply to approximately 1.2V below the positive
supply. Astheinputvoltagemovesclosertowardtheposi-
Power Dissipation
TheLT1800amplifierisofferedinasmallpackage,SOT-23,
whichhasathermalresistanceof250°C/W,θ .Sothereis
tive supply, the transistor Q5 will steer the tail current I to
JA
1
aneedtoensurethatthedie’sjunctiontemperatureshould
the current mirror Q6/Q7, activating the NPN differential
pair and the PNP pair becomes inactive for the rest of the
input common mode range up to the positive supply. Also
attheinputstage,devicesQ17toQ19acttocancelthebias
current of the PNP input pair. When Q1-Q2 are active, the
current in Q16 is controlled to be the same as the current
in Q1-Q2, thus the base current of Q16 is nominally equal
to the base current of the input devices. The base current
of Q16 is then mirrored by devices Q17-Q19 to cancel the
base current of the input devices Q1-Q2.
not exceed 150°C. Junction temperature T is calculated
J
from the ambient temperature T , power dissipation P
A
D
and thermal resistance θ :
JA
T = T + (P • θ )
J
A
D
JA
The power dissipation in the IC is the function of the sup-
ply voltage, output voltage and the load resistance. For
a given supply voltage, the worst-case power dissipation
P
DMAX
occurs at the maximum supply current and the
+
V
R3
R4
R5
–
+
V
V
Q12
+
+
D1
ESDD1
ESDD2
Q11
Q13
Q15
I
I
1
2
C2
+IN
–IN
+
D6
D5
D8
D7
Q5
V
BIAS
I
3
D2
OUT
C
C
–
V
Q4 Q3
Q1 Q2
D3
BUFFER
AND
ESDD4
ESDD3
OUTPUT BIAS
Q10
–
+
V
V
D4
Q9
R1
Q8
R2
Q16
C1
Q17
Q18
Q14
Q7
Q6
Q19
–
V
1800 F01
Figure 1. LT1800 Simplified Schematic Diagram
1800fa
12
LT1800
APPLICATIONS INFORMATION
output voltage is at half of either supply voltage (or the
maximum swing is less than 1/2 supply voltage). P
is given by:
amplifierhasreverse-biaseddiodesconnectedtoeachsup-
ply. If the output is forced beyond either supply, unlimited
current will flow through these diodes. If the current is
transient and limited to several hundred mA, and the total
supply voltage is less than 12.6V, the absolute maximum
rating, no damage will occur to the device.
DMAX
2
P
= (V • I
) + (V /2) /R
DMAX
S
SMAX
S
L
Example:AnLT1800inaSOT-23packageoperatingon 5V
supplies and driving a 50Ω load, the worst-case power
dissipation is given by:
Overdrive Protection
2
P
= (10 • 4mA) + (2.5) /50 = 0.04 + 0.125 = 0.165W
When the input voltage exceeds the power supplies, two
pairs of crossing diodes D1 to D4 will prevent the output
from reversing polarity. If the input voltage exceeds either
power supply by 700mV, diode D1/D2 or D3/D4 will turn
on to keep the output at the proper polarity. For the phase
reversal protection to perform properly, the input current
must be limited to less than 10mA. If the amplifier is
severely overdriven, an external resistor should be used
to limit the overdrive current.
DMAX
The maximum ambient temperature that the part is al-
lowed to operate is:
T = T – (P • 250°C/W)
DMAX
A
J
= 150°C – (0.165W • 250°C/W) = 108°C
Input Offset Voltage
The offset voltage will change depending upon which
input stage is active. The PNP input stage is active from
the negative supply rail to 1.2V of the positive supply rail,
then the NPN input stage is activated for the remaining
input range up to the positive supply rail during which
the PNP stage remains inactive. The offset voltage is
typically less than 75μV in the range that the PNP input
stage is active.
The LT1800’s input stages are also protected against a
large differential input voltage of 1.4V or higher by a pair
of back-back diodes D5/D8 to prevent the emitter-base
breakdown of the input transistors. The current in these
diodes should be limited to less than 10mA when they are
active. The worst-case differential input voltage usually
occurs when the input is driven while the output is shorted
to ground in a unity gain configuration. In addition, the
amplifier is protected against ESD strikes up to 3kV on
all pins by a pair of protection diodes on each pin that are
connected to the power supplies as shown in Figure 1.
Input Bias Current
The LT1800 employs a patent-pending technique to trim
the input bias current to less than 250nA for the input
common mode voltage of 0.2V above negative supply
rail to 1.2V of the positive rail. The low input offset volt-
age and low input bias current of the LT1800 provide the
precision performance especially for high source imped-
ance applications.
Capacitive Load
The LT1800 is optimized for high bandwidth, low power
and precision applications. It can drive a capacitive load
of about 75pF in a unity gain configuration, and more for
highergain.Whendrivingalargercapacitiveload,aresistor
of 10Ω to 50Ω should be connected between the output
and the capacitive load to avoid ringing or oscillation. The
feedback should still be taken from the output so that the
resistor will isolate the capacitive load to ensure stability.
Graphsoncapacitiveloadsindicatethetransientresponse
of the amplifier when driving capacitive load with a speci-
fied series resistor.
Output
TheLT1800candeliveralargeoutputcurrent,sotheshort-
circuit current limit is set around 50mA to prevent damage
to the device. Attention must be paid to keep the junction
temperature of the IC below the absolute maximum rating
of150°C(refertothePowerDissipationsection)whenthe
output is continuously short-circuited. The output of the
1800fa
13
LT1800
APPLICATIONS INFORMATION
Feedback Components
a capacitance of 5pF (part plus PC board) will probably
ring in transient response. The pole is formed at 12.7MHz
that will reduce phase margin by 32 degrees when the
crossover frequency of the amplifier is around 20MHz. A
capacitor of 5pF or higher connected across the feedback
resistor will eliminate any ringing or oscillation.
Whenfeedbackresistorsareusedtosetupgain,caremust
be taken to ensure that the pole formed by the feedback
resistors and the total capacitance at the inverting input
does not degrade stability. For instance, the LT1800 in a
noninverting gain of 2, set up with two 5k resistors and
TYPICAL APPLICATIONS
Single Supply 1A Laser Driver Amplifier
time domain response of this circuit, measured at R1 and
given a 500mV 230ns input pulse, is also shown in the
graphic on the front page. While the circuit is capable
of 1A operation, the laser diode and the transistor are
thermally limited due to power dissipation, so they must
be operated at low duty cycles.
The circuit in the front page of this data sheet shows the
LT1800 used in a 1A laser driver application. One of the
reasons the LT1800 is well suited to this control task is
that its 2.3V operation ensures that it will be awake during
power-up and operated before the circuit can otherwise
cause significant current to flow in the 2.1V threshold
laser diode. Driving the noninverting input of the LT1800
Fast 1A Current Sense Amplifier
Asimple,fastcurrentsenseamplifierinFigure2issuitable
forquicklyrespondingtoout-of-rangecurrents.Thecircuit
amplifies the voltage across the 0.1Ω sense resistor by
a gain of 20, resulting in a conversion gain of 2V/A. The
–3dBbandwidthofthecircuitis4MHz, andtheuncertainty
due to V and I is less than 4mA. The minimum output
to a voltage V will control the turning on of the high
IN
current NPN transistor, FMMT619 and the laser diode.
A current equal to V /R1 flows through the laser diode.
IN
The LT1800 low offset voltage and low input bias current
allows it to control the current that flows through the laser
diode precisely. The overall circuit is a 1A per volt V-to-I
converter. Frequency compensation components R2 and
C1 are selected for fast but zero-overshoot time domain
response to avoid overcurrent conditions in the laser. The
OS
B
voltage is 60mV, corresponding to 30mA. The large-signal
response of the circuit is shown in Figure 3.
I
L
3V
0A TO 1A
52.3Ω
+
–
V
OUT
LT1800
0V TO 2V
0.1Ω
500mV/DIV
0V
1k
52.3Ω
1800 F02
V
= 2 • I
= 4MHz
OUT
L
f
–3dB
1800 F03
UNCERTAINTY DUE TO V
I
< 4mA
OS,
B
V
S
= 3V
50ns/DIV
Figure 2. Fast 1A Current Sense
Figure 3. Current Sense Amplifier Large-Signal Response
1800fa
14
LT1800
TYPICAL APPLICATIONS
Single 3V Supply, 1MHz, 4th Order Butterworth Filter
rail-to-rail for maximum dynamic range. Figure 5 displays
the frequency response of the filter. Stopband attenuation
The circuit shown in Figure 4 makes use of the low voltage
operation and the wide bandwidth of the LT1800 to create
aDCaccurate1MHz4thorderlowpassfilterpoweredfrom
a 3V supply. The amplifiers are configured in the inverting
mode for the lowest distortion and the output can swing
is greater than 100dB at 50MHz. With a 2.25V , 250kHz
P-P
input signal, the filter has harmonic distortion products
of less than –85dBc. Worst-case output offset voltage is
less than 6mV.
47pF
909Ω
2.67k
3V
909Ω
22pF
1.1k
2.21k
–
V
IN
1.1k
–
220pF
LT1800
+
470pF
V
OUT
LT1800
+
V /2
S
1800 F04
Figure 4. 3V, 1MHz, 4th Order Butterworth Filter
0
–20
–40
–60
–80
–100
–120
1k
10k
100k
1M
10M
100M
FREQUENCY (Hz)
1800 F05
Figure 5. Frequency Response of Filter
1800fa
15
LT1800
PACKAGE DESCRIPTION
S5 Package
5-Lead Plastic TSOT-23
(Reference LTC DWG # 05-08-1635)
0.62
MAX
0.95
REF
2.90 BSC
(NOTE 4)
1.22 REF
1.50 – 1.75
(NOTE 4)
2.80 BSC
1.4 MIN
3.85 MAX 2.62 REF
PIN ONE
RECOMMENDED SOLDER PAD LAYOUT
PER IPC CALCULATOR
0.30 – 0.45 TYP
5 PLCS (NOTE 3)
0.95 BSC
0.80 – 0.90
0.20 BSC
DATUM ‘A’
0.01 – 0.10
1.00 MAX
0.30 – 0.50 REF
1.90 BSC
0.09 – 0.20
(NOTE 3)
NOTE:
S5 TSOT-23 0302 REV B
1. DIMENSIONS ARE IN MILLIMETERS
2. DRAWING NOT TO SCALE
3. DIMENSIONS ARE INCLUSIVE OF PLATING
4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR
5. MOLD FLASH SHALL NOT EXCEED 0.254mm
6. JEDEC PACKAGE REFERENCE IS MO-193
1800fa
16
LT1800
PACKAGE DESCRIPTION
S8 Package
8-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610)
.189 – .197
(4.801 – 5.004)
.045 .005
NOTE 3
.050 BSC
7
5
8
6
.245
MIN
.160 .005
.150 – .157
(3.810 – 3.988)
NOTE 3
.228 – .244
(5.791 – 6.197)
.030 .005
TYP
1
3
4
2
RECOMMENDED SOLDER PAD LAYOUT
.010 – .020
(0.254 – 0.508)
× 45°
.053 – .069
(1.346 – 1.752)
.004 – .010
(0.101 – 0.254)
.008 – .010
(0.203 – 0.254)
0°– 8° TYP
.016 – .050
(0.406 – 1.270)
.050
(1.270)
BSC
.014 – .019
(0.355 – 0.483)
TYP
NOTE:
INCHES
1. DIMENSIONS IN
(MILLIMETERS)
2. DRAWING NOT TO SCALE
3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
SO8 0303
1800fa
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 representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
17
LT1800
TYPICAL APPLICATION
Low Power High Voltage Amplifier
DC output voltage. When no signal is present, the op
amp output sits at about mid-supply. Transistors Q1 and
Q3 create bias voltages for Q2 and Q4, which are forced
into a low quiescent current by degeneration resistors
Certainmaterialsusedinopticalapplicationshavecharac-
teristics that change due to the presence and strength of a
DCelectricfield.Thevoltageappliedacrossthesematerials
should be precisely controlled to maintain desired proper-
ties, sometimes as high as 100’s of volts. The materials
are not conductive and represent a capacitive load.
R4 and R5. When a transient signal arrives at V , the op
IN
amp output moves and causes the current in Q2 or Q4
to change depending on the signal polarity. The current,
limited by the clipping of the LT1800 output and the 3kꢀ
of total emitter degeneration, is mirrored to the output
devices to drive the capacitive load. The LT1800 output
then returns to near mid-supply, providing the precise DC
outputvoltagetotheload.Theattentiontolimitthecurrent
of the output devices minimizes power dissipation thus
allowing for dense layout, and inherits better reliability.
Figure 7 shows the time domain response of the amplifier
providing a 200V output swing into a 100pF load.
The circuit of Figure 6 shows the LT1800 used in an ampli-
fier capable of a 250V output swing and providing precise
130V
5V
10k
4.99k
1k
Q6
Q5
0.1MF
Q2
Q1
5V
5V
R4
2k
R6
2k
+
R2
2k
V
OUT
LT1800
–
MATERIAL UNDER
R5
2k
R7
2k
ELECTRIC FIELD
100pF
V
IN
2V/DIV
Q3
Q4
V
IN
R1
2k
A = V /V = –100
V OUT IN
C1
39pF
10k
V
OUT
50V/DIV
130V SUPPLY I = 130MA
Q
Q7
Q8
1k
OUTPUT SWING = 128.8V
OUTPUT OFFSET 20mV
OUTPUT SHORT-CIRCUIT CURRENT 3mA
10% TO 90% RISE TIME 8Ms, 200V OUTPUT STEP
SMALL-SIGNAL BANDWIDTH 150kHz
Q1, Q2, Q7, Q8: ON SEMI MPSA42
Q3, Q4, Q5, Q6: ON SEMI MPSA92
C2
R3
200k
8pF
4.99k
150V
–130V
1800 F07
10μs/DIV
1800 F06
Figure 6. Low Power, High Voltage Amplifier
Figure 7. Large-Signal Time Domain
Response of the Amplifier
RELATED PARTS
PART NUMBER DESCRIPTION
COMMENTS
0.1dB Gain Flatness to 150MHz, Shutdown
LT1498/LT1499 Dual/Quad 10MHz, 6Vμs Rail-to-Rail Input and Output C-Load™ Op Amps High DC Accuracy, 475μV V , 4mV/°C Max Drift,
LT1399
Triple 300MHz Current Feedback Amplifier
OS(MAX)
Max Supply Current 2.2mA per Amp
LT1630/LT1631 Dual/Quad 30MHz, 10V/μs Rail-to-Rail Input and Output Op Amps
High DC Accuracy, 525μV V , 70mA Output Current,
OS(MAX)
Max Supply Current 4.4mA per Amplifier
LT1801/LT1802 80MHz, 25V/μs Low Power Rail-to-Rail Input/Output Precision Op Amps
LT1806/LT1807 Single/Dual 325MHz, 140V/μs Rail-to-Rail Input and Output Op Amps
Dual/Quad Version of the LT1800
High DC Accuracy, 550μV V
, Low Noise 3.5nV/√Hz,
OS(MAX)
Low Distortion –80dB at 5MHz, Power-Down (LT1806)
LT1809/LT1810 Single/Dual 180MHz Rail-to-Rail Input/Output Op Amps
350V/μs Slew Rate, Low Distortion –t at 5MHz,
Power-Down (LT1809)
C-Load is a trademark of Linear Technology Corporation.
1800fa
LT 0709 REV A • PRINTED IN USA
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
18
●
●
© LINEAR TECHNOLOGY CORPORATION 2009
(408) 432-1900 FAX: (408) 434-0507 www.linear.com
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