LT1812CS6#TRMPBF [Linear]
LT1812 - 3mA, 100MHz, 750V/µs Operational Amplifier with Shutdown; Package: SOT; Pins: 6; Temperature Range: 0°C to 70°C;
| 型号： | LT1812CS6#TRMPBF |
| 厂家： | 
Linear |
| 描述： | LT1812 - 3mA, 100MHz, 750V/µs Operational Amplifier with Shutdown; Package: SOT; Pins: 6; Temperature Range: 0°C to 70°C 放大器 光电二极管 |
| 文件： | 总16页 (文件大小：242K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LT1812
3mA, 100MHz, 750V/µs
Operational Amplifier
with Shutdown
FEATURES
DESCRIPTION
The LT®1812 is a low power, high speed, very high slew
rate operational amplifier with excellent DC performance.
The LT1812 features reduced supply current, lower input
offset voltage, lower input bias current and higher DC gain
than other devices with comparable bandwidth. A power
saving shutdown feature reduces supply current to 50μA.
Thecircuittopologyisavoltagefeedbackamplifierwiththe
slewing characteristics of a current feedback amplifier.
n
100MHz Gain Bandwidth
n
750V/μs Slew Rate
n
3.6mA Maximum Supply Current
50μA Supply Current in Shutdown
n
n
8nV/√Hz Input Noise Voltage
Unity-Gain Stable
n
n
1.5mV Maximum Input Offset Voltage
n
4μA Maximum Input Bias Current
n
400nA Maximum Input Offset Current
Theoutputdrivesa100Ωloadto 3.5Vwith 5Vsupplies.
On a single 5V supply, the output swings from 1.1V to
3.9V with a 100Ω load connected to 2.5V. The amplifier
is stable with a 1000pF capacitive load which makes it
useful in buffer and cable driver applications.
n
40mA Minimum Output Current, V
= 3V
OUT
n
n
n
n
n
3.5V Minimum Input CMꢀ, V = 5V
S
30ns Settling Time to 0.1%, 5V Step
Specified at 5V, Single 5V Supplies
Operating Temperature ꢀange: –40°C to 85°C
™
The LT1812 is manufactured on Linear Technology’s
advanced low voltage complementary bipolar process.
The dual version is the LT1813. For higher supply voltage
single, dual and quad operational amplifiers with up to
70MHz gain bandwidth, see the LT1351 through LT1365
data sheets.
Low Profile (1mm) SOT-23 (ThinSOT )
and S8 Packages
APPLICATIONS
n
Wideband Amplifiers
Buffers
Active Filters
Video and ꢀF Amplification
Cable Drivers
Data Acquisition Systems
n
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
n
n
n
Filter Frequency Response
TYPICAL APPLICATION
10
0
4MHz, 4th Order Butterworth Filter
232Ω
–10
–20
274Ω
–30
–40
47pF
232Ω
665Ω
220pF
–
+
V
IN
22pF
274Ω
562Ω
470pF
–
+
–50
–60
LT1812
LT1812
V
OUT
–70
V
V
=
IN
5V
S
= 600mV
P-P
–80
1812 TA01
PEAKING < 0.12dB
–90
0.1
1
10
100
FꢀEQUENCY (MHz)
1812 TA02
1812fb
1
LT1812
ABSOLUTE MAXIMUM RATINGS
(Note 1)
+
–
Total Supply Voltage (V to V ) ..............................12.6V
Differential Input Voltage (Transient Only, Note 2)...... 3V
Specified Temperature ꢀange
(Note 8).................................................... –40°C to 85°C
Maximum Junction Temperature........................... 150°C
Storage Temperature ꢀange................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec) ................... 300°C
Input Voltage, Shutdown Voltage............................... V
S
Output Short-Circuit Duration (Note 3) ............. Indefinite
Operating Temperature ꢀange (Note 8)..... –40°C to 85°C
PIN CONFIGURATION
TOP VIEW
TOP VIEW
TOP VIEW
NC
–IN
+IN
1
2
3
4
8
7
6
5
SHDN
+
+
V
1
2
6 V
V
1
2
5 V
OUT
OUT
+
V
–
+
–
–
V
5 SHDN
V
V
+
+
OUT
–
–
+IN 3
4 –IN
+IN 3
4 –IN
–
V
NC
S6 PACKAGE
6-LEAD PLASTIC TSOT-23
S5 PACKAGE
5-LEAD PLASTIC TSOT-23
S8 PACKAGE
8-LEAD PLASTIC SO
T
JMAX
= 150°C, θ = 230°C/ W
T
= 150°C, θ = 250°C/ W
JA
JMAX
JA
(NOTE 9)
T
= 150°C, θ = 150°C/ W
(NOTE 9)
JMAX
JA
(NOTE 9)
ORDER INFORMATION
LEAD FREE FINISH
LT1812CS5#PBF
LT1812IS5#PBF
LT1812CS6#PBF
LT1812IS6#PBF
LT1812CS8#PBF
LT1812IS8#PBF
TAPE AND REEL
PART MARKING
LTLH
PACKAGE DESCRIPTION
5-Lead Plastic TSOT-23
5-Lead Plastic TSOT-23
6-Lead Plastic TSOT-23
6-Lead Plastic TSOT-23
8-Lead Plastic SO
SPECIFIED TEMPERATURE RANGE
0°C to 70°C
LT1812CS5#TꢀPBF
LT1812IS5#TꢀPBF
LT1812CS6#TꢀPBF
LT1812IS6#TꢀPBF
LT1812CS8#TꢀPBF
LT1812IS8#TꢀPBF
LTLJ
–40°C to 85°C
LTLK
0°C to 70°C
LTLL
–40°C to 85°C
1812
0°C to 70°C
1812I
8-Lead Plastic SO
–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/
1812fb
2
LT1812
TA = 25°C, VS = 5V, VCM = 0V unless otherwise noted (Note 10).
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
0.4
30
MAX
1.5
400
4
UNITS
mV
V
Input Offset Voltage
Input Offset Current
Input Bias Current
(Note 4)
OS
I
I
nA
OS
–0.9
8
μA
B
e
Input Noise Voltage Density
Input Noise Current Density
Input ꢀesistance
f = 10kHz
f = 10kHz
nV/√Hz
pA/√Hz
n
i
n
1
ꢀ
V
=
3.5V
3
10
1.5
MΩ
MΩ
IN
CM
Differential
C
V
Input Capacitance
2
pF
IN
Input Voltage ꢀange (Positive)
Input Voltage ꢀange (Negative)
3.5
75
4.2
–4.2
V
V
CM
–3.5
2
CMꢀꢀ
Common Mode ꢀejection ꢀatio
Minimum Supply Voltage
V
=
3.5V
85
dB
V
CM
1.25
97
PSꢀꢀ
Power Supply ꢀejection ꢀatio
Large-Signal Voltage Gain
V = 2V to 5.5V
S
78
dB
A
VOL
V
OUT
V
OUT
=
=
3V, ꢀ = 500Ω
3V, ꢀ = 100Ω
1.5
1.0
3.0
2.5
V/mV
V/mV
L
L
V
Maximum Output Swing
ꢀ = 500Ω, 30mV Overdrive
L
3.80
3.35
4.0
3.5
V
V
OUT
L
ꢀ = 100Ω, 30mV Overdrive
I
I
Maximum Output Current
Output Short-Circuit Current
Slew ꢀate
V
V
=
3V, 30mV Overdrive
40
75
60
110
750
40
mA
mA
V/μs
MHz
MHz
ns
OUT
OUT
OUT
= 0V, 1V Overdrive (Note 3)
SC
Sꢀ
A = –1 (Note 5)
V
500
FPBW
GBW
Full Power Bandwidth
Gain Bandwidth Product
ꢀise Time, Fall Time
Overshoot
3V Peak (Note 6)
f = 200kHz
75
100
2
t , t
r
A = 1, 10% to 90%, 0.1V, ꢀ = 100Ω
V L
f
OS
A = 1, 0.1V, ꢀ = 100Ω
V
25
%
L
t
PD
t
s
Propagation Delay
Settling Time
A = 1, 50% V to 50% V , 0.1V, ꢀ = 100Ω
2.8
30
ns
V
IN
OUT
L
5V Step, 0.1%, A = –1
ns
V
THD
Total Harmonic Distortion
Differential Gain
f = 1MHz, V
= 2V , A = 2, ꢀ = 500Ω
–76
0.12
0.07
0.4
dB
OUT
P-P
V
L
V
OUT
V
OUT
= 2V , A = 2, ꢀ = 150Ω
%
P-P
V
L
Differential Phase
Output ꢀesistance
SHDN Pin Current
= 2V , A = 2, ꢀ = 150Ω
DEG
Ω
P-P
V
L
ꢀ
OUT
A = 1, f = 1MHz
V
–
–
I
SHDN > V + 2.0V (On) (Note 11)
0
–50
1
μA
μA
SHDN
SHDN < V + 0.4V (Off) (Note 11)
–100
–
–
I
Supply Current
SHDN > V + 2.0V (On) (Note 11)
3
50
3.6
100
mA
μA
S
SHDN < V + 0.4V (Off) (Note 11)
TA = 25°C, VS = 5V, VCM = 2.5V, RL to 2.5V unless otherwise noted (Note 10).
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
0.5
30
MAX
2.0
400
4
UNITS
mV
V
Input Offset Voltage
Input Offset Current
Input Bias Current
(Note 4)
OS
I
I
nA
OS
–1.0
8
μA
B
e
Input Noise Voltage Density
Input Noise Current Density
Input ꢀesistance
f = 10kHz
f = 10kHz
nV/√Hz
pA/√Hz
n
i
n
1
ꢀ
V
= 1.5V to 3.5V
3
10
1.5
MΩ
MΩ
IN
CM
Differential
1812fb
3
LT1812
ELECTRICAL CHARACTERISTICS TA = 25°C, VS = 5V, VCM = 0V unless otherwise noted (Note 10).
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
C
V
Input Capacitance
2
pF
IN
Input Voltage ꢀange (Positive)
Input Voltage ꢀange (Negative)
3.5
73
4
1
V
V
CM
1.5
CMꢀꢀ
Common Mode ꢀejection ꢀatio
Large-Signal Voltage Gain
V
= 1.5V to 3.5V
82
dB
CM
A
VOL
V
OUT
V
OUT
= 1.5V to 3.5V, ꢀ = 500Ω
= 1.5V to 3.5V, ꢀ = 100Ω
1.0
0.7
2.0
1.5
V/mV
V/mV
L
L
V
Maximum Output Swing (Positive)
Maximum Output Swing (Negative)
ꢀ = 500Ω, 30mV Overdrive
L
3.9
3.7
4.1
3.9
V
V
OUT
L
ꢀ = 100Ω, 30mV Overdrive
ꢀ = 500Ω, 30mV Overdrive
0.9
1.1
1.1
1.3
V
V
L
ꢀ = 100Ω, 30mV Overdrive
L
I
I
Maximum Output Current
Output Short-Circuit Current
Slew ꢀate
V
V
= 3.5V or 1.5V, 30mV Overdrive
= 2.5V, 1V Overdrive (Note 3)
25
55
40
80
mA
mA
V/μs
MHz
MHz
ns
OUT
OUT
OUT
SC
Sꢀ
A = –1 (Note 5)
V
200
350
55
FPBW
GBW
Full Power Bandwidth
Gain Bandwidth Product
ꢀise Time, Fall Time
Overshoot
1V Peak (Note 6)
f = 200kHz
65
94
t , t
r
A = 1, 10% to 90%, 0.1V, ꢀ = 100Ω
V
2.1
25
f
L
OS
A = 1, 0.1V, ꢀ = 100Ω
V
%
L
t
PD
t
s
Propagation Delay
Settling Time
A = 1, 50% V to 50% V , 0.1V, ꢀ = 100Ω
3
ns
V
IN
OUT
L
2V Step, 0.1%, A = –1
30
ns
V
THD
Total Harmonic Distortion
Differential Gain
f = 1MHz, V
= 2V , A = 2, ꢀ = 500Ω
–75
0.22
0.21
0.45
dB
OUT
P-P
V
L
V
OUT
V
OUT
= 2V , A = 2, ꢀ = 150Ω
%
P-P
V
L
Differential Phase
Output ꢀesistance
SHDN Pin Current
= 2V , A = 2, ꢀ = 150Ω
DEG
Ω
P-P
V
L
ꢀ
OUT
A = 1, f = 1MHz
V
–
–
I
SHDN > V + 2.0V (On) (Note 11)
0
–20
1
μA
μA
SHDN
SHDN < V + 0.4V (Off) (Note 11)
–50
–
–
I
Supply Current
SHDN > V + 2.0V (On) (Note 11)
2.7
20
3.6
50
mA
μA
S
SHDN < V + 0.4V (Off) (Note 11)
0°C ≤ TA ≤ 70°C, VS = 5V, VCM = 0V unless otherwise noted (Note 10).
SYMBOL PARAMETER
Input Offset Voltage
ΔV /ΔT Input Offset Voltage Drift
CONDITIONS
(Note 4)
MIN
TYP
MAX
2
UNITS
mV
V
OS
OS
(Note 7)
10
15
500
5
μV/°C
nA
I
I
Input Offset Current
Input Bias Current
OS
B
μA
V
Input Voltage ꢀange (Positive)
Input Voltage ꢀange (Negative)
3.5
73
V
V
CM
–3.5
2
CMꢀꢀ
Common Mode ꢀejection ꢀatio
Minimum Supply Voltage
V
CM
=
3.5V
dB
V
PSꢀꢀ
Power Supply ꢀejection ꢀatio
Large-Signal Voltage Gain
V = 2V to 5.5V
76
dB
S
A
VOL
V
OUT
V
OUT
=
=
3V, ꢀ = 500Ω
1.0
0.7
V/mV
V/mV
L
3V, ꢀ = 100Ω
L
V
Maximum Output Swing
Maximum Output Current
ꢀ = 500Ω, 30mV Overdrive
L
3.70
3.25
V
V
OUT
OUT
L
ꢀ = 100Ω, 30mV Overdrive
I
V
OUT
=
3V, 30mV Overdrive
35
mA
1812fb
4
LT1812
ELECTRICAL CHARACTERISTICS 0°C ≤ TA ≤ 70°C, VS = 5V, VCM = 0V unless otherwise noted (Note 10).
SYMBOL PARAMETER
CONDITIONS
= 0V, 1V Overdrive (Note 3)
MIN
60
TYP
MAX
UNITS
mA
I
Output Short-Circuit Current
Slew ꢀate
V
OUT
SC
Sꢀ
A = –1 (Note 5)
V
400
65
V/μs
MHz
GBW
Gain Bandwidth Product
SHDN Pin Current
f = 200kHz
–
–
I
SHDN > V + 2.0V (On) (Note 11)
1.5
μA
μA
SHDN
SHDN < V + 0.4V (Off) (Note 11)
–150
–
–
I
Supply Current
SHDN > V + 2.0V (On) (Note 11)
4.6
150
mA
μA
S
SHDN < V + 0.4V (Off) (Note 11)
0°C ≤ TA ≤ 70°C, VS = 5V, VCM = 2.5V, RL to 2.5V unless otherwise noted (Note 10).
SYMBOL PARAMETER
Input Offset Voltage
ΔV /ΔT Input Offset Voltage Drift
CONDITIONS
(Note 4)
MIN
TYP
MAX
2.5
15
UNITS
mV
V
OS
OS
(Note 7)
10
μV/°C
nA
I
I
Input Offset Current
Input Bias Current
500
5
OS
B
μA
V
Input Voltage ꢀange (Positive)
Input Voltage ꢀange (Negative)
3.5
71
V
V
CM
1.5
CMꢀꢀ
Common Mode ꢀejection ꢀatio
Large-Signal Voltage Gain
V
= 1.5V to 3.5V
dB
CM
A
VOL
V
OUT
V
OUT
= 1.5V to 3.5V, ꢀ = 500Ω
= 1.5V to 3.5V, ꢀ = 100Ω
0.7
0.5
V/mV
V/mV
L
L
V
OUT
Maximum Output Swing (Positive)
Maximum Output Swing (Negative)
ꢀ = 500Ω, 30mV Overdrive
L
3.8
3.6
V
V
L
ꢀ = 100Ω, 30mV Overdrive
ꢀ = 500Ω, 30mV Overdrive
1.2
1.4
V
V
L
ꢀ = 100Ω, 30mV Overdrive
L
I
I
Maximum Output Current
Output Short-Circuit Current
Slew ꢀate
V
V
= 3.5V or 1.5V, 30mV Overdrive
= 2.5V, 1V Overdrive (Note 3)
20
45
mA
mA
OUT
OUT
OUT
SC
Sꢀ
A = –1 (Note 5)
V
150
55
V/μs
MHz
GBW
Gain Bandwidth Product
SHDN Pin Current
f = 200kHz
–
–
I
SHDN > V + 2.0V (On) (Note 11)
SHDN < V + 0.4V (Off) (Note 11)
1.5
μA
μA
SHDN
–75
–
–
I
Supply Current
SHDN > V + 2.0V (On) (Note 11)
4.5
75
mA
μA
S
SHDN < V + 0.4V (Off) (Note 11)
–40°C ≤ TA ≤ 85°C. VS = 5V, VCM = 0V unless otherwise noted (Notes 8, 10).
SYMBOL PARAMETER
Input Offset Voltage
ΔV /ΔT Input Offset Voltage Drift
CONDITIONS
(Note 4)
MIN
TYP
MAX
3
UNITS
mV
V
OS
OS
(Note 7)
10
30
600
6
μV/°C
nA
I
OS
I
B
Input Offset Current
Input Bias Current
μA
V
Input Voltage ꢀange (Positive)
Input Voltage ꢀange (Negative)
3.5
72
V
V
CM
–3.5
2
CMꢀꢀ
Common Mode ꢀejection ꢀatio
Minimum Supply Voltage
V
CM
=
3.5V
dB
V
PSꢀꢀ
Power Supply ꢀejection ꢀatio
Large-Signal Voltage Gain
V = 2V to 5.5V
75
dB
S
A
VOL
V
OUT
V
OUT
=
=
3V, ꢀ = 500Ω
0.8
0.6
V/mV
V/mV
L
3V, ꢀ = 100Ω
L
1812fb
5
LT1812
ELECTRICAL CHARACTERISTICS –40°C ≤ TA ≤ 85°C. VS = 5V, VCM = 0V unless otherwise noted (Notes 8, 10).
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
Maximum Output Swing
ꢀ = 500Ω, 30mV Overdrive
L
3.60
3.15
V
V
OUT
L
ꢀ = 100Ω, 30mV Overdrive
I
I
Maximum Output Current
Output Short-Circuit Current
Slew ꢀate
V
V
=
3V, 30mV Overdrive
30
55
mA
mA
OUT
OUT
OUT
= 0V, 1V Overdrive (Note 3)
SC
Sꢀ
A = –1 (Note 5)
V
350
60
V/μs
MHz
GBW
Gain Bandwidth Product
SHDN Pin Current
f = 200kHz
–
–
I
SHDN > V + 2.0V (On) (Note 11)
SHDN < V + 0.4V (Off) (Note 11)
2
μA
μA
SHDN
–200
–
–
I
Supply Current
SHDN > V + 2.0V (On) (Note 11)
5
200
mA
μA
S
SHDN < V + 0.4V (Off) (Note 11)
–40°C ≤ TA ≤ 85°C, VS = 5V, VCM = 2.5V, RL to 2.5V unless otherwise noted (Notes 8, 10).
SYMBOL PARAMETER
Input Offset Voltage
ΔV /ΔT Input Offset Voltage Drift
CONDITIONS
MIN
TYP
MAX
3.5
30
UNITS
mV
V
(Note 4)
OS
OS
(Note 7)
10
μV/°C
nA
I
I
Input Offset Current
Input Bias Current
600
6
OS
B
μA
V
Input Voltage ꢀange (Positive)
Input Voltage ꢀange (Negative)
3.5
70
V
V
CM
1.5
CMꢀꢀ
Common Mode ꢀejection ꢀatio
Large-Signal Voltage Gain
V
= 1.5V to 3.5V
dB
CM
A
VOL
V
OUT
V
OUT
= 1.5V to 3.5V, ꢀ = 500Ω
= 2.0V to 3.0V, ꢀ = 100Ω
0.6
0.4
V/mV
V/mV
L
L
V
Maximum Output Swing (Positive)
Maximum Output Swing (Negative)
ꢀ = 500Ω, 30mV Overdrive
L
3.7
3.5
V
V
OUT
L
ꢀ = 100Ω, 30mV Overdrive
ꢀ = 500Ω, 30mV Overdrive
1.3
1.5
V
V
L
ꢀ = 100Ω, 30mV Overdrive
L
I
I
Maximum Output Current
Output Short-Circuit Current
Slew ꢀate
V
V
= 3.5V or 1.5V, 30mV Overdrive
= 2.5V, 1V Overdrive (Note 3)
17
40
mA
mA
OUT
OUT
OUT
SC
Sꢀ
A = –1 (Note 5)
V
125
50
V/μs
MHz
GBW
Gain Bandwidth Product
SHDN Pin Current
f = 200kHz
–
–
I
SHDN > V + 2.0V (On) (Note 11)
SHDN < V + 0.4V (Off) (Note 11)
2
μA
μA
SHDN
–100
–
–
I
Supply Current
SHDN > V + 2.0V (On) (Note 11)
5
100
mA
μA
S
SHDN < V + 0.4V (Off) (Note 11)
Note 1: Stresses beyond those listed under Absolute Maximum ꢀatings may
cause permanent damage to the device. Exposure to any Absolute Maximum
ꢀating condition for extended periods may affect device reliability and lifetime.
Note 2: Differential inputs of 3V are appropriate for transient operation
only, such as during slewing. Large sustained differential inputs can cause
excessive power dissipation and may damage the part.
Note 3: A heat sink may be required to keep the junction temperature below
absolute maximum when the output is shorted indefinitely.
Note 4: Input offset voltage is pulse tested and is exclusive of warm-up drift.
Note 5: Slew rate is measured between 2V on the output with 3V input for
Note 8: The LT1812C is guaranteed to meet specified performance from
0°C to 70°C. The LT1812C 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 LT1812I is guaranteed to meet specified
performance from –40°C to 85°C.
Note 9: Thermal resistance varies with the amount of PC board metal conn-
ected to the package. The nominal values are for short traces connected to the
pins. The thermal resistance can be substantially reduced by connecting Pin 2
of the 5-lead or 6-lead TSOT-23 or Pin 4 of the SO-8 to a large metal area.
Note 10: For the 8-lead SO and 6-lead TSOT-23 parts, the electrical charac-
teristics apply to the “ON” state, unless otherwise noted. These parts are in
5V supplies and 2V on the output with a 3V input for single 5V supplies.
P-P
P-P
–
the “ON” state when either SHDN is not connected, or SHDN > V + 2.0V.
Note 6: Full power bandwidth is calculated from the slew rate: FPBW = Sꢀ/2πV .
P
Note 11: The shutdown (SHDN) feature is not available on the 5-lead
Note 7: This parameter is not 100% tested.
SOT-23 parts. These parts are always in the “ON” state.
1812fb
6
LT1812
TYPICAL PERFORMANCE CHARACTERISTICS
Input Common Mode Range
Input Bias Current
vs Common Mode Voltage
Supply Current vs Temperature
vs Supply Voltage
+
5
4
3
2
1
0
V
0
–0.5
–1.0
–1.5
–2.0
T
= 25°C
= 5V
A
S
–0.5
–1.0
–1.5
–2.0
V
V
= 5V
S
T
= 25°C
OS
A
V
= 2.5V
S
ēV < 1mV
2.0
1.5
1.0
0.5
–
V
0
2.5
5.0
–50 –25
0
25
50
75 100 125
0
2
3
4
5
6
7
–5.0
–2.5
1
TEMPEꢀATUꢀE (°C)
SUPPLY VOLTAGE ( V)
INPUT COMMON MODE VOLTAGE (V)
1812 G03
1812 G01
1812 G02
Input Bias Current
vs Temperature
Open-Loop Gain
vs Resistive Load
Input Noise Spectral Density
100
10
1
10
0
75.0
72.5
70.0
67.5
65.0
62.5
60
T
= 25°C
T
= 25°C
A
A
S
V
V
A
= 5V
–0.2
= 101
= 10k
ꢀ
S
–0.4
–0.6
–0.8
–1.0
–1.2
V
V
=
=
5V
S
S
i
n
1
e
n
V
=
5V
2.5V
S
V
=
2.5V
S
0.1
100k
–1.4
50
TEMPEꢀATUꢀE (°C)
100 125
–50 –25
0
25
75
10
100
1k
FꢀEQUENCY (Hz)
10k
100
1k
LOAD ꢀESISTANCE (Ω)
10k
1812 G05
1812 G06
1812 G04
Output Voltage Swing
vs Supply Voltage
Output Voltage Swing
vs Load Current
Open-Loop Gain vs Temperature
+
+
V
75.0
72.5
70.0
67.5
V
T
= 25°C
IN
V
V
= 5V
V
V
=
=
5V
3V
A
S
S
O
–0.5
–1.0
–1.5
–2.0
–0.5
–1.0
–1.5
–2.0
V
= 30mV
= 30mV
85°C
IN
ꢀ
= 500Ω
L
25°C
–40°C
ꢀ
ꢀ
= 500Ω
= 100Ω
ꢀ = 100Ω
L
L
L
2.0
1.5
1.0
0.5
2.0
1.5
1.0
0.5
65.0
62.5
60.0
ꢀ
= 100Ω
L
ꢀ
= 500Ω
L
–
–
V
V
50
100 125
0
2
3
4
5
6
7
–50 –25
0
25
75
1
–60
–40
–20
0
20
40
60
SUPPLY VOLTAGE ( V)
TEMPEꢀATUꢀE (°C)
OUTPUT CUꢀꢀENT (mA)
1812 G07
1812 G08
1812 G09
1812fb
7
LT1812
TYPICAL PERFORMANCE CHARACTERISTICS
Output Short-Circuit Current
vs Temperature
Open-Loop Gain and Phase
vs Frequency
Gain vs Frequency
6
4
2
0
120
115
110
105
70
60
50
40
30
20
10
0
120
100
80
V
= 5V
T
= 25°C
T
= 25°C
A = 1
V
S
A
V
F
A
SOUꢀCE
A
= –1
V
=
2.5V
5V
S
ꢀ
= ꢀ = 500Ω
G
NO ꢀ
L
PHASE
GAIN
V
=
S
60
–2
–4
SINK
2.5V
5V
5V
40
2.5V
–6
–8
20
100
95
0
–10
–12
–14
–20
–40
90
–10
50
TEMPEꢀATUꢀE (°C)
100 125
1M
10M
100M
500M
–50 –25
0
25
75
10k
100k
1M
10M
100M 1000M
FꢀEQUENCY (Hz)
FꢀEQUENCY (Hz)
1812 G13
1812 G16
1812 G10
Gain Bandwidth and Phase
Margin vs Supply Voltage
Settling Time vs Output Step
Gain vs Frequency
5
4
110
90
8
6
T
= 25°C
T
= 25°C
A
A
V
L
GBW
A
= 2
ꢀ
ꢀ
= 500Ω
L
ꢀ
= 100Ω
3
4
2
GBW
= 100Ω
L
1
2
0
V
=
2.5V
V = 5V
S
70
45
40
35
S
0
PHASE MAꢀGIN
–1
–2
–3
–4
–5
ꢀ
= 100Ω
L
T
V
A
ꢀ
C
= 25°C
A
S
V
F
F
–2
–4
–6
= 5V
= –1
= 500Ω
= 3pF
PHASE MAꢀGIN
= 500Ω
ꢀ
L
0.1% SETTLING
1
2
4
5
6
7
1M
10M
FꢀEQUENCY (Hz)
100M
500M
0
3
0
10
15
20
25
30
35
5
SETTLING TIME (ns)
SUPPLY VOLTAGE ( V)
1812 G17
1812 G19
1812 G11
Gain Bandwidth and Phase
Margin vs Temperature
Output Impedance vs Frequency
Gain vs Frequency
12
8
100
10
115
105
95
C = 1000pF
L
ꢀ
= 500Ω
T
= 25°C
= –1
L
A
V
S
A
V
C = 500pF
L
=
5V
A
= 100
V
GBW
5V
ꢀ
= ꢀ = 500Ω
F
G
C = 200pF
L
V
=
S
A
= 10
A
NO ꢀ
L
V
GBW
2.5V
C = 100pF
L
V
=
= 1
1
4
S
V
C = 50pF
L
C = 0
L
0.1
0
85
40
38
36
PHASE MAꢀGIN
5V
V
=
S
–4
–8
0.01
0.001
PHASE MAꢀGIN
V
=
2.5V
T
= 25°C
S
A
S
V
=
5V
–50 –25
50
75 100 125
1
10M
FꢀEQUENCY (Hz)
100M 200M
10k
100k 1M
FꢀEQUENCY (Hz)
10M
100M
0
25
TEMPEꢀATUꢀE (°C)
1812 G12
1812 G18
1812 G15
1812fb
8
LT1812
TYPICAL PERFORMANCE CHARACTERISTICS
Shutdown Supply Current
vs Temperature
Power Supply Rejection Ratio
vs Frequency
Common Mode Rejection Ratio
vs Frequency
100
80
60
40
20
0
100
80
60
40
20
0
70
60
–
T
A
V
= 25°C
= 1
=
V
= V + 0.4V
T = 25°C
A
A
V
S
SHDN
V
= 5V
S
5V
V
=
5V
S
50
40
30
20
10
–PSꢀꢀ
+PSꢀꢀ
V
=
2.5V
S
0
50
TEMPEꢀATUꢀE (°C)
100 125
1k
10k
100k
1M
10M
100M
–50 –25
0
25
75
1k
10k
100k
1M
10M
100M
FꢀEQUENCY (Hz)
FꢀEQUENCY (Hz)
1812 G20
1812 G21
1812 G14
Slew Rate vs Supply Voltage
Slew Rate vs Supply Voltage
Slew Rate vs Input Level
600
500
400
300
200
1200
1100
1000
900
800
700
600
500
400
300
200
1200
1000
800
T
=25°C
= –1
T
=25°C
= –1
= V
T
=25°C
= –1
A
V
A
V
IN
F
A
V
S
A
V
A
V
A
V
=
1V
/2
=
5V
IN
S(TOTAL)
ꢀ
= ꢀ = ꢀ = 500Ω
ꢀ
= ꢀ = ꢀ = 500Ω
ꢀ
= ꢀ = ꢀ = 500Ω
G
F
G
L
G
L
F
L
–
Sꢀ
–
Sꢀ
+
–
Sꢀ
Sꢀ
+
Sꢀ
600
+
Sꢀ
400
200
4
5
7
0
2
3
4
5
6
7
0
1
2
3
6
0
2
3
4
5
6
7
8
1
1
SUPPLY VOLTAGE ( V)
SUPPLY VOLTAGE ( V)
INPUT LEVEL (V
)
P-P
1812 G23
1812 G22
1812 G24
Total Harmonic Distortion + Noise
vs Frequency
Undistorted Output Swing
vs Frequency
Slew Rate vs Temperature
1200
1000
800
0.01
9
8
7
6
5
4
3
2
1
0
A
= –1
V
–
Sꢀ
S
+
V
=
5V
Sꢀ
S
A
= –1
= 1
A
V
= 1
V
V
= 5V
0.005
A
V
600
–
Sꢀ
=
V
V
2.5V
S
S
400
200
0
0.002
0.001
+
Sꢀ
=
T
= 25°C
T
= 25°C
A
S
O
A
S
L
2.5V
V
V
=
5V
V
=
5V
= 2V
ꢀ
= 100Ω
P-P
ꢀ
= 500Ω
2% MAX DISTOꢀTION
1M
FꢀEQUENCY (Hz)
L
50
100 125
100k
10M
100M
–50 –25
0
25
75
10
100
1k
10k
100k
FꢀEQUENCY (Hz)
TEMPEꢀATUꢀE (°C)
1812 G27
1812 G26
1812 G25
1812fb
9
LT1812
TYPICAL PERFORMANCE CHARACTERISTICS
2nd and 3rd Harmonic Distortion
vs Frequency
Differential Gain and Phase
vs Supply Voltage
Capacitive Load Handling
100
90
0.25
0.20
0.15
0.10
0.05
0
–30
–40
–50
–60
–70
–80
–90
–100
T
= 25°C
= 5V
T
= 25°C
= 2
A
S
A
DIFFEꢀENTIAL GAIN
V
A
V
V
V
S
O
ꢀ
= 150Ω
L
=
5V
80
= 2V
P-P
A
= 1
V
70
2ND HAꢀMONIC
3ꢀD HAꢀMONIC
DIFFEꢀENTIAL GAIN
= 1k
ꢀ
60
50
L
ꢀ
L
= 100Ω
0.25
0.20
0.15
0.10
0.05
0
A
= –1
DIFFEꢀENTIAL PHASE
= 150Ω
V
40
30
20
10
0
ꢀ
L
DIFFEꢀENTIAL PHASE
ꢀ = 1k
L
3ꢀD HAꢀMONIC
2ND HAꢀMONIC
ꢀ
L
= 500Ω
T
= 25°C
A
10000
100k
10M
4
8
10
TOTAL SUPPLY VOLTAGE (V)
12
10
100
1000
1M
FꢀEQUENCY (Hz)
6
CAPACITIVE LOAD (pF)
1812 G30
1812 G28
1812 G29
Small-Signal Transient,
AV = –1
Small-Signal Transient,
AV = 1
Small-Signal Transient,
AV = 1, CL = 1000pF
Large-Signal Transient,
AV = –1
Large-Signal Transient,
AV = 1
Large-Signal Transient,
AV = 1, CL = 1000pF
1812fb
10
LT1812
APPLICATIONS INFORMATION
Layout and Passive Components
the capacitive load increases, both the bandwidth and
phase margin decrease so there will be peaking in the
frequency domain and in the transient response. Coaxial
cable can be driven directly, but for best pulse fidelity, a
resistor of value equal to the characteristic impedance of
the cable (i.e., 75Ω) should be placed in series with the
output. The other end of the cable should be terminated
with the same value resistor to ground.
The LT1812 amplifier is more tolerant of less than ideal
layouts than other high speed amplifiers. For maximum
performance (for example, fast settling) use a ground
plane,shortleadlengthsandꢀF-qualitybypasscapacitors
(0.01μF to 0.1μF). For high drive current applications, use
low ESꢀ bypass capacitors (1μF to 10μF tantalum).
The parallel combination of the feedback resistor and gain
setting resistor on the inverting input combine with the
input capacitance to form a pole that can cause peaking
or even oscillations. If feedback resistors greater than 2k
are used, a parallel capacitor of value
Slew Rate
The slew rate is proportional to the differential input
voltage.Highestslewratesarethereforeseeninthelowest
gain configurations. For example, a 5V output step in a
gain of 10 has a 0.5V input step, whereas in unity gain
there is a 5V input step. The LT1812 is tested for slew
rate in a gain of –1. Lower slew rates occur in higher
gain configurations.
C > ꢀ • C /ꢀ
F
F
G
IN
should be used to cancel the input pole and optimize
dynamic performance. For applications where the DC
noise gain is 1 and a large feedback resistor is used, C
F
should be greater than or equal to C . An example would
IN
Shutdown
be an I-to-V converter.
The LT1812 has a shutdown pin (SHDN, Pin 8) for
conserving power. When this pin is open or biased at
least 2V above the negative supply, the part operates
Input Considerations
Each of the LT1812 amplifier inputs is the base of an NPN
and PNP transistor whose base currents are of opposite
polarity and provide first-order bias current cancellation.
Because of variation in the matching of NPN and PNP
beta, the polarity of the input bias current can be positive
or negative. The offset current does not depend on beta
matchingandiswellcontrolled.Theuseofbalancedsource
resistance at each input is recommended for applications
where DC accuracy must be maximized. The inputs can
withstand differential input voltages of up to 3V without
damage and need no clamping or source resistance for
protection.
–
normally. When pulled down to V , the supply current
drops to about 50μA. Typically, the turn-off delay is
1μs and the turn-on delay 0.5μs. The current out of the
SHDN pin is also typically 50μA. In shutdown mode, the
amplifier output is not isolated from the inputs, so the
LT1812shutdownfeaturecannotbeusedformultiplexing
applications. The 50μA typical shutdown current is
exclusiveofanyoutput(load)current. Inordertoprevent
load current (and maximize the power savings), either
the load needs to be disconnected, or the input signal
needs to be 0V. Even in shutdown mode, the LT1812 can
still drive significant current into a load. For example, in
The device should not be used as a comparator because
with sustained differential inputs, excessive power dissi-
pation may result.
an A = 1 configuration, when driven with a 1V DC input,
V
the LT1812 drives 2mA into a 100Ω load. It takes about
500μs for the load current to reach this value.
Capacitive Loading
Power Dissipation
The LT1812 is stable with a 1000pF capacitive load,
which is outstanding for a 100MHz amplifier. This is
accomplished by sensing the load induced output pole
and adding compensation at the amplifier gain node. As
The LT1812 combines high speed and large output drive
in a small package. It is possible to exceed the maximum
junction temperature under certain conditions. Maximum
1812fb
11
LT1812
APPLICATIONS INFORMATION
junction temperature (T ) is calculated from the ambient
the resistor generating currents that are mirrored into the
high impedance node. Complementary followers form an
output stage that buffers the gain node from the load. The
bandwidth is set by the input resistor and the capacitance
onthehighimpedancenode.Theslewrateisdeterminedby
the current available to charge the gain node capacitance.
This current is the differential input voltage divided by ꢀ1,
so the slew rate is proportional to the input. Highest slew
rates are therefore seen in the lowest gain configurations.
The ꢀC network across the output stage is bootstrapped
when the amplifier is driving a light or moderate load
and has no effect under normal operation. When driving
capacitive loads (or a low value resistive load) the network
isincompletelybootstrappedandaddstothecompensation
at the high impedance node. The added capacitance slows
down the amplifier which improves the phase margin by
moving the unity-gain cross away from the pole formed
by the output impedance and the capacitive load. The zero
created by the ꢀC combination adds phase to ensure that
the total phase lag does not exceed 180 degrees (zero
phase margin) and the amplifier remains stable. In this
way, the LT1812 is stable with up to 1000pF capacitive
loads in unity gain, and even higher capacitive loads in
higher closed-loop gain configurations.
J
temperature (T ) and power dissipation (P ) as follows:
A
D
T = T + (P • θ ) (Note 9)
J
A
D
JA
Powerdissipationiscomposedoftwoparts.Thefirstisdue
to the quiescent supply current and the second is due to
on-chipdissipationcausedbytheloadcurrent. Theworst-
case load induced power occurs when the output voltage
is at 1/2 of either supply voltage (or the maximum swing
if less than 1/2 supply voltage). Therefore P
is:
DMAX
+
–
+
2
P
P
= (V – V )(I
) + (V /2) /ꢀ or
DMAX
DMAX
SMAX
L
+
–
+
= (V – V )(I
) + (V – V
)(V
/ꢀ )
SMAX
OMAX
OMAX L
Example: LT1812CS5 at 70°C, V = 5V, ꢀ = 100Ω
S
L
2
P
= (10V)(4.5mA) + (2.5V) /100Ω = 108mW
= 70°C + (108mW)(250°C/W) = 97°C
DMAX
JMAX
T
Circuit Operation
The LT1812 circuit topology is a true voltage feedback
amplifierthathastheslewingbehaviorofacurrentfeedback
amplifier. The operation of the circuit can be understood
by referring to the Simplified Schematic. The inputs are
bufferedbycomplementaryNPNandPNPemitterfollowers
thatdrivea300Ωresistor.Theinputvoltageappearsacross
SIMPLIFIED SCHEMATIC
+
V
ꢀ
B
ꢀ1
300Ω
C
C
+IN
ꢀ
C
OUT
–IN
C
BIAS
CONTꢀOL
SHDN
–
V
1812 SS
1812fb
12
LT1812
PACKAGE DESCRIPTION
S5 Package
5-Lead Plastic TSOT-23
(ꢀeference LTC DWG # 05-08-1635)
0.62
MAX
0.95
ꢀEF
2.90 BSC
(NOTE 4)
1.22 ꢀEF
1.50 – 1.75
(NOTE 4)
2.80 BSC
1.4 MIN
3.85 MAX 2.62 ꢀEF
PIN ONE
ꢀECOMMENDED SOLDEꢀ PAD LAYOUT
PEꢀ IPC CALCULATOꢀ
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 ꢀEF
1.90 BSC
0.09 – 0.20
(NOTE 3)
NOTE:
S5 TSOT-23 0302 ꢀEV B
1. DIMENSIONS AꢀE IN MILLIMETEꢀS
2. DꢀAWING NOT TO SCALE
3. DIMENSIONS AꢀE INCLUSIVE OF PLATING
4. DIMENSIONS AꢀE EXCLUSIVE OF MOLD FLASH AND METAL BUꢀꢀ
5. MOLD FLASH SHALL NOT EXCEED 0.254mm
6. JEDEC PACKAGE ꢀEFEꢀENCE IS MO-193
1812fb
13
LT1812
PACKAGE DESCRIPTION
S6 Package
6-Lead Plastic TSOT-23
(ꢀeference LTC DWG # 05-08-1636)
2.90 BSC
(NOTE 4)
0.62
MAX
0.95
ꢀEF
1.22 ꢀEF
1.4 MIN
1.50 – 1.75
2.80 BSC
3.85 MAX 2.62 ꢀEF
(NOTE 4)
PIN ONE ID
ꢀECOMMENDED SOLDEꢀ PAD LAYOUT
PEꢀ IPC CALCULATOꢀ
0.30 – 0.45
6 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 ꢀEF
1.90 BSC
0.09 – 0.20
(NOTE 3)
S6 TSOT-23 0302 ꢀEV B
NOTE:
1. DIMENSIONS AꢀE IN MILLIMETEꢀS
2. DꢀAWING NOT TO SCALE
3. DIMENSIONS AꢀE INCLUSIVE OF PLATING
4. DIMENSIONS AꢀE EXCLUSIVE OF MOLD FLASH AND METAL BUꢀꢀ
5. MOLD FLASH SHALL NOT EXCEED 0.254mm
6. JEDEC PACKAGE ꢀEFEꢀENCE IS MO-193
1812fb
14
LT1812
PACKAGE DESCRIPTION
S8 Package
8-Lead Plastic Small Outline (Narrow .150 Inch)
(ꢀeference 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
ꢀECOMMENDED SOLDEꢀ PAD LAYOUT
.010 – .020
(0.254 – 0.508)
s 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
(MILLIMETEꢀS)
2. DꢀAWING NOT TO SCALE
3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH Oꢀ PꢀOTꢀUSIONS.
MOLD FLASH Oꢀ PꢀOTꢀUSIONS SHALL NOT EXCEED .006" (0.15mm)
SO8 0303
1812fb
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.
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LT1812
TYPICAL APPLICATION
Single 5V Supply 10MS/s 12-Bit ADC Buffer
V
P-P
IN
2V
+
–
12 BITS
10MS/s
68Ω
2.5V
DC
LT1812
LTC1420
470pF
1812 TA03
RELATED PARTS
PART NUMBER
LT1360/LT1361/LT1362
LT1363/LT1364/LT1365
LT1395/LT1396/LT1397
LT1806
DESCRIPTION
COMMENTS
™
Single/Dual/Quad 50MHz, 800V/μs, C-Load Amplifiers 4mA Supply Current, 1mV Max V , 1μA Max I
OS
B
Single/Dual/Quad 70MHz, 1000V/μs, C-Load Amplifiers 50mA Output Current, 1.5mV Max V , 2μA Max I
OS
B
Single/Dual/Quad 400MHz Current Feedback Amplifiers 4.6mA Supply Current, 800V/μs, 80mA Output Current
325MHz, 140V/μs ꢀail-to-ꢀail I/O Op Amp
180MHz, 350V/μs ꢀail-to-ꢀail I/O Op Amp
Dual 3mA, 100MHz, 750V/μs Operational Amplifier
Low Noise 3.5nV/√Hz
LT1809
Low Distortion –90dBc at 5MHz
Dual Version of the LT1812
LT1813
C-Load is a trademark of Linear Technology Corporation.
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LT 0909 REV B • PRINTED IN USA
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
16
●
●
© LINEAR TECHNOLOGY CORPORATION 1999
(408) 432-1900 FAX: (408) 434-0507 www.linear.com
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