LT1813IS8 [Linear]
Dual 3mA, 100MHz, 750V/us Operational Amplifier; 双3mA电流，为100MHz ， 750V / us的运算放大器
| 型号： | LT1813IS8 |
| 厂家： | 
Linear |
| 描述： | Dual 3mA, 100MHz, 750V/us Operational Amplifier |
| 文件： | 总12页 (文件大小：207K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LT1813
Dual 3mA, 100MHz, 750V/µs
Operational Amplifier
U
FEATURES
DESCRIPTIO
The LT®1813 is a low power, high speed, very high slew
rate operational amplifier with excellent DC performance.
The LT1813 features reduced supply current, lower input
offset voltage, lower input bias current and higher DC gain
thanotherdeviceswithcomparablebandwidth.Thecircuit
topology is a voltage feedback amplifier with the slewing
characteristics of a current feedback amplifier.
■
100MHz Gain Bandwidth
■
750V/µs Slew Rate
■
3.6mA Maximum Supply Current per Amplifier
■
8nV/√Hz Input Noise Voltage
Unity-Gain Stable
■
■
1.5mV Maximum Input Offset Voltage
■
4µA Maximum Input Bias Current
■
400nA Maximum Input Offset Current
Theoutputdrivesa100Ωloadto±3.5Vwith±5Vsupplies.
Onasingle5Vsupply,theoutputswingsfrom1.1Vto3.9V
witha100Ωloadconnectedto2.5V.Theamplifierisstable
with a 1000pF capacitive load which makes it useful in
buffer and cable driver applications.
■
40mA Minimum Output Current, VOUT = ±3V
■
±3.5V Minimum Input CMR, VS = ±5V
Specified at ±5V, Single 5V
■
■
Available in MS8 and SO-8 Packages
U
The LT1813 is manufactured on Linear Technology’s
advanced low voltage complementary bipolar process.
For higher supply voltage single, dual and quad opera-
tionalamplifierswithupto70MHzgainbandwidth, seethe
LT1351 through LT1365 data sheets.
APPLICATIO S
■
Wideband Amplifiers
■
Buffers
Active Filters
■
, LTC and LT are registered trademarks of Linear Technology Corporation.
■
Video and RF Amplification
■
Cable Drivers
■
Data Acquisition Systems
U
TYPICAL APPLICATIO
4MHz, 4th Order Butterworth Filter
Filter Frequency Response
10
0
232Ω
274Ω
–10
–20
–30
47pF
232Ω
665Ω
–
V
IN
22pF
274Ω
562Ω
–
–40
–50
–60
–70
–80
–90
1/2 LT1813
+
220pF
1/2 LT1813
V
OUT
470pF
+
1813 TA01
V
V
= ±5V
S
= 600mV
P-P
IN
PEAKING < 0.12dB
0.1
1
10
100
FREQUENCY (MHz)
1813 TA02
1
LT1813
W W U W
ABSOLUTE MAXIMUM RATINGS (Note 1)
Total Supply Voltage (V+ to V–)............................. 12.6V
Differential Input Voltage (Transient Only, Note 2) ... ±3V
Input Voltage ........................................................... ±VS
Output Short-Circuit Duration (Note 3)............ Indefinite
Operating Temperature Range ................ –40°C to 85°C
Specified Temperature Range
(Notes 8, 9)......................................... –40°C to 85°C
Maximum Junction Temperature ......................... 150°C
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................... 300°C
U
W U
PACKAGE/ORDER INFORMATION
ORDER PART
NUMBER
ORDER PART
NUMBER
TOP VIEW
TOP VIEW
+
OUT A
–IN A
+IN A
1
2
3
4
8
7
6
5
V
LT1813CS8
LT1813IS8
LT1813DS8*
LT1813DMS8*
+
OUT A
–IN A
+IN A
1
2
3
4
8 V
OUT B
–IN B
+IN B
7 OUT B
6 –IN B
5 +IN B
A
–
V
B
–
V
MS8 PACKAGE
8-LEAD PLASTIC MSOP
MS8 PART MARKING
LTGZ
S8 PART MARKING
S8 PACKAGE
8-LEAD PLASTIC SO
TJMAX = 150°C, θJA = 150°C/ W
TJMAX = 150°C, θJA = 250°C/ W
1813
1813I
1813D
Consult factory for Military grade parts. *See note 9.
ELECTRICAL CHARACTERISTICS
TA = 25°C, VS = ±5V, VCM = 0V unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
0.5
50
MAX
1.5
UNITS
mV
V
Input Offset Voltage
Input Offset Current
Input Bias Current
Input Noise Voltage
Input Noise Current
Input Resistance
(Note 4)
OS
I
I
400
±4
nA
OS
–0.9
8
µA
B
e
f = 10kHz
f = 10kHz
nV/√Hz
pA/√Hz
n
i
1
n
R
V
CM
= ±3.5V
3
10
1.5
MΩ
MΩ
IN
Differential
C
IN
Input Capacitance
2
pF
Input Voltage Range (High)
Input Voltage Range (Low)
3.5
4.2
–4.2
V
V
–3.5
CMRR
PSRR
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Large-Signal Voltage Gain
V
= ±3.5V
75
78
85
96
dB
dB
CM
V = ±2V to ±5.5V
S
A
VOL
V
OUT
V
OUT
= ±3V, R = 500Ω
= ±3V, R = 100Ω
1.5
1.0
3.0
2.5
V/mV
V/mV
L
L
V
OUT
Output Swing
R = 500Ω, 30mV Overdrive
R = 100Ω, 30mV Overdrive
L
±3.80
±3.35
±4.0
±3.5
V
V
L
I
I
Output Current
V
V
= ±3V, 30mV Overdrive
±40
±75
500
±60
±100
750
40
mA
mA
OUT
SC
OUT
OUT
Short-Circuit Current
Slew Rate
= 0V, V = ±1V
IN
SR
A = –1 (Note 5)
V
V/µs
MHz
Full Power Bandwidth
3V Peak (Note 6)
2
LT1813
ELECTRICAL CHARACTERISTICS TA = 25°C, VS = ±5V, VCM = 0V unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
100
2
MAX
UNITS
MHz
ns
GBW
Gain Bandwidth
Rise Time, Fall Time
Overshoot
f = 200kHz
75
t , t
A = 1, 10% to 90%, 0.1V, R = 100Ω
V L
r
f
A = 1, 0.1V, R = 100Ω
V
25
2.8
0.4
90
3
%
L
Propagation Delay
Output Resistance
Channel Separation
Supply Current
50% V to 50% V , 0.1V, R = 100Ω
ns
IN
OUT
L
R
A = 1, f = 1MHz
V
Ω
O
V
OUT
= ±3V, R = 100Ω
82
dB
L
I
Per Amplifier
3.6
mA
S
TA = 25°C, VS = 5V, VCM = 2.5V, RL to 2.5V unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
0.7
50
–1
8
MAX
2
UNITS
mV
V
OS
Input Offset Voltage
Input Offset Current
Input Bias Current
Input Noise Voltage
Input Noise Current
Input Resistance
(Note 4)
I
I
400
±4
nA
OS
µA
B
e
f = 10kHz
f = 10kHz
nV/√Hz
pA/√Hz
n
i
1
n
R
IN
V
= 1.5V to 3.5V
3
20
1.5
MΩ
MΩ
CM
Differential
C
IN
Input Capacitance
2
pF
Input Voltage Range (High)
Input Voltage Range (Low)
3.5
73
4
1
V
V
1.5
CMRR
Common Mode Rejection Ratio
Large-Signal Voltage Gain
V
= 1.5V to 3.5V
82
dB
CM
A
VOL
V
OUT
V
OUT
= 1.5V to 3.5V, R = 500Ω
= 1.5V to 3.5V, R = 100Ω
1.0
0.7
2.0
1.5
V/mV
V/mV
L
L
V
OUT
Output Swing (High)
Output Swing (Low)
R = 500Ω, 30mV Overdrive
L
3.9
3.7
4.1
3.9
V
V
L
R = 100Ω, 30mV Overdrive
R = 500Ω, 30mV Overdrive
0.9
1.1
1.1
1.3
V
V
L
R = 100Ω, 30mV Overdrive
L
I
I
Output Current
V
V
= 3.5V or 1.5V, 30mV Overdrive
±25
±55
200
±35
±75
350
55
mA
mA
V/µs
MHz
MHz
ns
OUT
SC
OUT
OUT
Short-Circuit Current
Slew Rate
= 2.5V, V = ±1V
IN
SR
A = –1 (Note 5)
V
Full Power Bandwidth
Gain Bandwidth
Rise Time, Fall Time
Overshoot
1V Peak (Note 6)
f = 200kHz
GBW
65
94
t , t
A = 1, 10% to 90%, 0.1V, R = 100Ω
V
2.1
25
r
f
L
A = 1, 0.1V, R = 100Ω
V
%
L
Propagation Delay
Output Resistance
Channel Separation
Supply Current
50% V to 50% V , 0.1V, R = 100Ω
3
ns
IN
OUT
L
R
A = 1, f = 1MHz
V
0.45
92
Ω
O
V
OUT
= 1.5V to 3.5V, R = 100Ω
81
dB
L
I
Per Amplifier
2.9
3.6
mA
S
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the temperature range
0°C ≤ TA ≤ 70°C. VS = ±5V, VCM = 0V unless otherwise noted (Note 9).
SYMBOL
PARAMETER
CONDITIONS
(Note 4)
MIN
TYP
MAX
2
UNITS
mV
V
Input Offset Voltage
●
●
●
●
OS
Input V Drift
(Note 7)
10
15
µV/°C
nA
OS
I
I
Input Offset Current
Input Bias Current
500
±5
OS
µA
B
3
LT1813
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the temperature range
0°C ≤ TA ≤ 70°C. VS = ±5V, VCM = 0V unless otherwise noted (Note 9).
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Input Voltage Range (High)
Input Voltage Range (Low)
●
●
3.5
V
V
–3.5
CMRR
PSRR
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Large-Signal Voltage Gain
V
= ±3.5V
●
●
73
76
dB
dB
CM
V = ±2V to ±5.5V
S
A
V
OUT
V
OUT
= ±3V, R = 500Ω
= ±3V, R = 100Ω
●
●
1.0
0.7
V/mV
V/mV
VOL
L
L
V
Output Swing
R = 500Ω, 30mV Overdrive
L
●
●
±3.70
±3.25
V
V
OUT
L
R = 100Ω, 30mV Overdrive
I
I
Output Current
Short-Circuit Current
Slew Rate
V
V
= ±3V, 30mV Overdrive
●
●
●
●
●
●
±35
±60
400
65
mA
mA
OUT
SC
OUT
OUT
= 0V, V = ±1V
IN
SR
A = –1 (Note 5)
V
V/µs
MHz
dB
GBW
Gain Bandwidth
Channel Separation
Supply Current
f = 200kHz
V
OUT
, ±3V, R = 100Ω
81
L
I
Per Amplifier
4.5
mA
S
0°C ≤ TA ≤ 70°C, VS = 5V, VCM = 2.5V, RL to 2.5V unless otherwise noted (Note 9).
V
Input Offset Voltage
(Note 4)
●
●
●
●
2.5
15
mV
µV/°C
nA
OS
Input V Drift
(Note 7)
10
OS
I
I
Input Offset Current
Input Bias Current
500
±5
OS
µA
B
Input Voltage Range (High)
Input Voltage Range (Low)
●
●
3.5
71
V
V
1.5
CMRR
Common Mode Rejection Ratio
Large-Signal Voltage Gain
V
= 1.5V to 3.5V
●
dB
CM
A
V
OUT
V
OUT
= 1.5V to 3.5V, R = 500Ω
= 1.5V to 3.5V, R = 100Ω
●
●
0.7
0.5
V/mV
V/mV
VOL
L
L
V
Output Swing (High)
Output Swing (Low)
R = 500Ω, 30mV Overdrive
L
●
●
3.8
3.6
V
V
OUT
L
R = 100Ω, 30mV Overdrive
R = 500Ω, 30mV Overdrive
●
●
1.2
1.4
V
V
L
R = 100Ω, 30mV Overdrive
L
I
I
Output Current
Short-Circuit Current
Slew Rate
V
V
= 3.5V or 1.5V, 30mV Overdrive
●
●
●
●
●
●
±20
±45
150
55
mA
mA
OUT
SC
OUT
OUT
= 2.5V, V = ±1V
IN
SR
A = –1 (Note 5)
V
V/µs
MHz
dB
GBW
Gain Bandwidth
Channel Separation
Supply Current
f = 200kHz
V
OUT
, 1.5V to 3.5V, R = 100Ω
80
L
I
Per Amplifier
4.5
mA
S
–40°C ≤ TA ≤ 85°C. VS = ±5V, VCM = 0V unless otherwise noted (Notes 8, 9).
SYMBOL
PARAMETER
CONDITIONS
(Note 4)
MIN
TYP
MAX
3
UNITS
mV
V
Input Offset Voltage
●
●
●
●
OS
Input V Drift
(Note 7)
10
30
µV/°C
nA
OS
I
I
Input Offset Current
Input Bias Current
600
±6
OS
µA
B
Input Voltage Range (High)
Input Voltage Range (Low)
●
●
3.5
V
V
–3.5
CMRR
PSRR
Common Mode Rejection Ratio
Power Supply Rejection Ratio
V
= ±3.5V
●
●
72
75
dB
dB
CM
V = ±2V to ±5.5V
S
4
LT1813
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the temperature range
–40°C ≤ TA ≤ 85°C. VS = ±5V, VCM = 0V unless otherwise noted (Notes 8, 9).
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
A
V
Large-Signal Voltage Gain
V
V
= ±3V, R = 500Ω
●
●
0.8
0.6
V/mV
V/mV
VOL
OUT
OUT
OUT
L
= ±3V, R = 100Ω
L
Output Swing
R = 500Ω, 30mV Overdrive
R = 100Ω, 30mV Overdrive
●
●
±3.60
±3.15
V
V
L
L
I
I
Output Current
Short-Circuit Current
Slew Rate
V
V
= ±3V, 30mV Overdrive
●
●
●
●
●
●
±30
±55
350
60
mA
mA
OUT
SC
OUT
OUT
= 0V, V = ±1V
IN
SR
A = –1 (Note 5)
V
V/µs
MHz
dB
GBW
Gain Bandwidth
Channel Separation
Supply Current
f = 200kHz
V
OUT
, ±3V, R = 100Ω
80
L
I
Per Amplifier
5
mA
S
–40°C ≤ TA ≤ 85°C, VS = 5V, VCM = 2.5V, RL to 2.5V unless otherwise noted (Notes 8, 9).
V
Input Offset Voltage
(Note 4)
(Note 7)
●
●
●
●
3.5
30
mV
µV/°C
nA
OS
Input V Drift
10
OS
I
I
Input Offset Current
Input Bias Current
600
±6
OS
µA
B
Input Voltage Range (High)
Input Voltage Range (Low)
●
●
3.5
70
V
V
1.5
CMRR
Common Mode Rejection Ratio
Large-Signal Voltage Gain
V
= 1.5V to 3.5V
●
dB
CM
A
V
OUT
V
OUT
= 1.5V to 3.5V, R = 500Ω
= 1.5V to 3.5V, R = 100Ω
●
●
0.6
0.4
V/mV
V/mV
VOL
L
L
V
Output Swing (High)
Output Swing (Low)
R = 500Ω, 30mV Overdrive
R = 100Ω, 30mV Overdrive
L
●
●
3.7
3.5
V
V
OUT
L
R = 500Ω, 30mV Overdrive
●
●
1.3
1.5
V
V
L
R = 100Ω, 30mV Overdrive
L
I
I
Output Current
Short-Circuit Current
Slew Rate
V
V
= 3.5V or 1.5V, 30mV Overdrive
●
●
●
●
●
●
±17
±40
125
50
mA
mA
OUT
SC
OUT
OUT
= 2.5V, V = ±1V
IN
SR
A = –1 (Note 5)
V
V/µs
MHz
dB
GBW
Gain Bandwidth
Channel Separation
Supply Current
f = 200kHz
V
OUT
, 1.5V to 3.5V, R = 100Ω
79
L
I
Per Amplifier
5
mA
S
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 6: Full power bandwidth is calculated from the slew rate:
FPBW = SR/2πV .
P
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 7: This parameter is not 100% tested.
Note 8: The LT1813C is guaranteed to meet specified performance from
0°C to 70°C and is designed, characterized and expected to meet these
extended temperature limits, but is not tested at –40°C and 85°C. The
LT1813I is guaranteed to meet the extended temperature limits.
Note 9: The LT1813D is 100% production tested at 25°C. It is designed,
characterized and expected to meet the 0°C to 70°C specifications
although it is not tested or QA sampled at these temperatures. The
LT1813D is guaranteed functional from –40°C to 85°C but may not meet
those specifications.
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 ±5V supplies and 2V on the output with a 3V input for single 5V
P-P
P-P
supplies.
5
LT1813
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Input Common Mode Range
Input Bias Current
vs Supply Voltage
vs Common Mode Voltage
Supply Current vs Temperature
+
5
4
3
2
1
0
V
0
–0.5
–1.0
–1.5
–2.0
T
= 25°C
= ±5V
PER AMPLIFIER
A
S
–0.5
–1.0
–1.5
–2.0
V
V
S
= ±5V
V
= ±2.5V
S
T = 25°C
A
∆V < 1mV
OS
2.0
1.5
1.0
0.5
–
V
–50 –25
0
25
50
75 100 125
0
2
3
4
5
6
7
0
1
–5.0
2.5
5.0
–2.5
TEMPERATURE (°C)
SUPPLY VOLTAGE (± V)
INPUT COMMON MODE VOLTAGE (V)
1813 G01
1813 G02
1813 G03
Input Bias Current
vs Temperature
Open-Loop Gain
vs Resistive Load
Input Noise Spectral Density
100
10
1
10
–0.6
–0.7
–0.8
–0.9
75.0
72.5
70.0
67.5
65.0
62.5
60
T
A
= 25°C
= ±5V
= 101
= 10k
T
= 25°C
V
S
= ±5V
A
V
A
S
V
R
S
V
V
= ±5V
S
S
i
n
1
e
n
= ±2.5V
–1.0
–1.1
–1.2
0.1
100k
10
100
1k
FREQUENCY (Hz)
10k
50
TEMPERATURE (°C)
100 125
–50 –25
0
25
75
100
1k
LOAD RESISTANCE (Ω)
10k
1813 G05
1813 G06
1813 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
V
V
= ±5V
= 30mV
85°C
V
S
V
O
= ±5V
= ±3V
T
= 25°C
IN
S
IN
A
–0.5
–1.0
–1.5
–2.0
–0.5
–1.0
–1.5
–2.0
V
= 30mV
R
= 500Ω
L
25°C
– 40°C
R
R
= 500Ω
= 100Ω
R
= 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
R
= 100Ω
L
R
= 500Ω
L
–
–
V
V
50
100 125
4
7
–50 –25
0
25
75
0
2
3
5
–60
–40
0
20
1
6
–20
40
60
SUPPLY VOLTAGE (± V)
TEMPERATURE (°C)
OUTPUT CURRENT (mA)
1813 G07
1813 G02
1813 G09
6
LT1813
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Output Short-Circuit Current
vs Temperature
Settling Time vs Output Step
Output Impedance vs Frequency
5
4
120
110
100
90
100
10
V
S
= ±5V
A
V
= 100
A
SOURCE
3
= 10
A
2
V
1
= 1
1
V
0
SINK
–1
–2
–3
–4
–5
0.1
V
A
= ±5V
= –1
= 500Ω
= 3pF
S
V
F
0.01
0.001
R
C
T
= 25°C
= ± 5V
F
A
S
0.1% SETTLING
10
SETTLING TIME (ns)
V
80
–50 –25
0
25
50
75 100 125
0
15
20
25
30
35
5
10k
100k
1M
FREQUENCY (Hz)
10M
100M
TEMPERATURE (°C)
1813 G12
1813 G10
1813 G11
Gain Bandwidth and Phase
Margin vs Temperature
Gain and Phase vs Frequency
Crosstalk vs Frequency
70
60
50
40
30
20
10
0
120
100
80
0
115
105
95
T
= 25°C
= 10
V
T
= 25°C
A
A
V
F
A
V
A
= –1
–10
–20
–30
–40
–50
–60
–70
–80
–90
= 0dBm
R = R = 500Ω
IN
= 100Ω
G
GBW
S
R
L
V
= ±5V
PHASE
GAIN
60
±2.5V ±5V
±2.5V ±5V
40
GBW
= ±2.5V
V
PHASE MARGIN
= ±5V
S
85
42
40
38
20
V
S
0
PHASE MARGIN
= ±2.5V
–20
–40
V
S
–10
10k
100k
1M
10M
100M 1000M
100k
1M
10M
100M
1000M
–50 –25
0
25
50
75 100 125
FREQUENCY (Hz)
FREQUENCY (Hz)
TEMPERATURE (°C)
1813 G13
1813 G14
1813 G15
Frequency Response
vs Supply Voltage, AV = 1
Frequency Response
vs Supply Voltage, AV = 2
Frequency Response
vs Capacitive Load, AV = –1
6
12
8
8
6
C = 1000pF
L
T
A
V
= 25°C
= –1
T
= 25°C
T
= 25°C
A
V
S
A
A
V
4
2
0
A
= 1
A
= 2
V
C = 500pF
L
V
= ±2.5V
S
= ±5V
NO R
R = 100Ω
L
L
R = R = 500Ω
NO R
F
G
C = 200pF
L
4
L
V
= ±5V
C = 100pF
L
S
–2
–4
4
2
C = 50pF
L
V
= ±2.5V
V = ±5V
S
S
0
C = 0
L
–6
–8
0
–2
–4
–6
–10
–12
–14
–4
–8
1M
10M
100M
500M
1M
10M
100M
500M
1
10M
100M 200M
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
1813 G16
1813 G17
1813 G18
7
LT1813
TYPICAL PERFOR A CE CHARACTERISTICS
U W
Gain Bandwidth and Phase
Margin vs Supply Voltage
Power Supply Rejection Ratio
vs Frequency
Common Mode Rejection Ratio
vs Frequency
100
80
60
40
20
0
100
80
60
40
20
0
105
100
T = 25°C
A
T
A
V
= 25°C
T
= 25°C
A
V
S
A
V
= ±5V
= 1
S
= ±5V
GBW
= 500Ω
R
–PSRR
L
95
90
85
80
+PSRR
GBW
= 100Ω
R
L
44
42
40
PHASE MARGIN
= 100Ω
R
L
PHASE MARGIN
R
= 500Ω
L
38
1k
10k
100k
1M
10M
100M
4
6
7
0
1
2
3
5
1k
10k
100k
1M
10M
100M
FREQUENCY (Hz)
SUPPLY VOLTAGE (±V)
FREQUENCY (Hz)
1813 G21
1813 G20
1813 G19
Slew Rate vs Supply Voltage
Slew Rate vs Supply Voltage
Slew Rate vs Input Level
1000
900
800
700
600
500
400
300
200
100
0
450
400
350
300
250
200
1200
1000
800
T
A
V
=25°C
T
A
V
=25°C
T
=25°C
A
V
A
V
A
V
S
= –1
= –1
A
V
= –1
+
SR
= V
S(TOTAL)
/2
= ±1V
= ±5V
IN
IN
R = R = R = 500Ω
R = R = R = 500Ω
R
= R = R = 500Ω
–
F
G
L
F
G
L
F
G
L
SR
+
SR
+
–
–
SR
SR
SR
600
400
200
0
2
3
4
5
6
7
0
2
3
4
5
6
7
0
2
3
4
5
6
7
8
1
1
1
SUPPLY VOLTAGE (±V)
SUPPLY VOLTAGE (±V)
INPUT LEVEL (V
)
P-P
1813 G22
1813 G23
1813 G24
Total Harmonic Distortion + Noise
vs Frequency
Undistorted Output Swing
vs Frequency
Slew Rate vs Temperature
9
8
7
6
5
4
3
2
1
0
1100
1000
900
800
700
600
500
400
300
200
0.01
A
V
= –1
+
SR
V
= ±5V
S
–
A
V
= 1
A
V
= –1
SR
= ±5V
V
S
0.005
A
V
= 1
0.002
0.001
T
= 25°C
= ±5V
= 2V
A
S
O
–
SR
V = ±2.5V
S
V
= ±5V
= 100Ω
V
V
S
L
R
P-P
+
SR
V = ±2.5V
S
2% MAX DISTORTION
1M
FREQUENCY (Hz)
R
= 500Ω
L
100k
10M
100M
–50 –25
0
75 100 125
25
50
10
100
1k
FREQUENCY (Hz)
10k
100k
TEMPERATURE (°C)
1813 G27
1813 G26
1813 G25
8
LT1813
U W
TYPICAL PERFOR A CE CHARACTERISTICS
2nd and 3rd Harmonic Distortion
vs Frequency
Differential Gain and Phase
vs Supply Voltage
Capacitive Load Handling
0.5
0.4
0.3
0.2
0.1
0
100
90
–30
–40
–50
–60
–70
–80
–90
–100
T
= 25°C
= ±5V
A
V
V
= 2
A
S
V
S
O
V
= ±5V
DIFFERENTIAL GAIN
= 2V
R = 150Ω
L
P-P
80
A
= 1
V
DIFFERENTIAL GAIN
= 1k
70
2ND HARMONIC
3RD HARMONIC
R
L
60
50
R
L
= 100Ω
0.5
0.4
0.3
0.2
0.1
0
A
= –1
V
DIFFERENTIAL PHASE
= 150Ω
40
30
20
10
0
R
L
3RD HARMONIC
2ND HARMONIC
DIFFERENTIAL PHASE
= 1k
R
L
R
= 500Ω
L
4
8
10
TOTAL SUPPLY VOLTAGE (V)
12
10
100
1000
10000
100k
10M
1M
6
FREQUENCY (Hz)
CAPACITIVE LOAD (pF)
1813 G30
1813 G28
1813 G29
Small-Signal Transient
(AV = 1, CL = 100pF)
Small-Signal Transient (AV = 1)
Small-Signal Transient (AV = –1)
1813 G32
1813 G33
1813 G31
Large-Signal Transient
(AV = –1, CL = 200pF)
Large-Signal Transient (AV = 1)
Large-Signal Transient (AV = –1)
1813 G34
1813 G35
1813 G36
9
LT1813
U
W U U
APPLICATIONS INFORMATION
Layout and Passive Components
Capacitive Loading
The LT1813 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,shortleadlengthsandRF-qualitybypasscapacitors
(0.01µF to 0.1µF). For high drive current applications, use
low ESR bypass capacitors (1µF to 10µF tantalum).
The LT1813 is stable with a 1000pF capacitive load which
is outstanding for a 100MHz amplifier. This is accom-
plished 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 frequency
domainandinthetransientresponse. Coaxialcablecanbe
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 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
oscillations. Iffeedbackresistorsgreaterthan2kareused,
a parallel capacitor of value
CF > RG • CIN/RF
Slew Rate
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, CF
should be greater than or equal to CIN. An example would
be an I-to-V converter.
The slew rate is proportional to the differential input
voltage. Highest slew rates are therefore seen in the
lowest 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 LT1813 is tested for slew rate
in a gain of –1. Lower slew rates occur in higher gain
configurations.
Input Considerations
Each of the LT1813 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.
BecauseofvariationinthematchingofNPNandPNPbeta,
thepolarityoftheinputcurrentcanbepositiveornegative.
The offset current does not depend on beta matching and
is well controlled. The use of balanced source 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.
Differential inputs generate the large supply currents (up
to 40mA) required for high slew rates. Typically, power
dissipation does not significantly increase in normal,
closed-loop operation because of the low duty cycle of the
transient inputs.
Power Dissipation
The LT1813 combines high speed and large output drive
in a small package. It is possible to exceed the maximum
junction temperature under certain conditions. Maximum
junction temperature (TJ) is calculated from the ambient
temperature (TA) and power dissipation (PD) as follows:
LT1813CS8: TJ = TA + (PD • 150°C/W)
Power dissipation is composed of two parts. The first is
due to the quiescent supply current and the second is
due to on-chip dissipation caused by the load current.
The worst-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). For each
amplifier:
The device should not be used as a comparator because
with sustained differential inputs, excessive power dissi-
pation may result.
PDMAX = (V+ – V–)(ISMAX) + (V+/2)2/RL or
PDMAX = (V+ – V–)(ISMAX) + (V+ – VOMAX)(VOMAX/RL)
10
LT1813
U
W U U
APPLICATIONS INFORMATION
Example: LT1813 in SO-8 at 70°C, VS = ±5V, RL = 100Ω
PDMAX = (10V)(4.5mA) + (2.5V)2/100Ω = 108mW
is the differential input voltage divided by R1, so the slew
rate is proportional to the input. Highest slew rates are
therefore seen in the lowest gain configurations.
T
JMAX = 70°C + (2 • 108mW)(150°C/W) = 102°C
The RC 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 ca-
pacitive loads (or a low value resistive load) the network is
incompletely bootstrapped and adds to the compensation
at the high impedance node. The added capacitance slows
down the amplifier which improves the phase margin by
movingtheunity-gaincrossawayfromthepoleformedby
the output impedance and the capacitive load. The zero
created by the RC 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 LT1813 is stable with up to 1000pF capacitive
loads in unity gain, and even higher capacitive loads in
higher closed-loop gain configurations.
Circuit Operation
The LT1813 circuit topology is a true voltage feedback
amplifier that has the slewing behavior of a current feed-
back amplifier. The operation of the circuit can be under-
stood by referring to the Simplified Schematic. The inputs
are buffered by complementary NPN and PNP emitter
followers which drive a 300Ω resistor. The input voltage
appears across the resistor generating currents that are
mirrored into the high impedance node.
Complementary followers form an output stage that buff-
ers the gain node from the load. The bandwidth is set by
the input resistor and the capacitance on the high imped-
ance node. The slew rate is determined by the current
availabletochargethegainnodecapacitance.Thiscurrent
W
W
SI PLIFIED SCHEMATIC
+
V
R1
300Ω
C
C
+IN
R
C
OUT
–IN
C
–
V
1813 SS
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-
tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.
11
LT1813
TYPICAL APPLICATION
U
Two Op Amp Instrumentation Amplifier
R5
220Ω
R4
10k
R1
10k
R2
1k
R3
1k
–
1/2
LT1813
–
1/2
LT1813
+
+
V
–
OUT
V
IN
+
R2 +R3
(
)
R4
R3
1
2
R2 R3
R1 R4
GAIN =
1+
+
+
= 102
R5
TRIM R5 FOR GAIN
1813 TA03
TRIM R1 FOR COMMON MODE REJECTION
BW = 1MHz
U
PACKAGE DESCRIPTION
S8 Package
MS8 Package
8-Lead Plastic Small Outline (Narrow 0.150)
8-Lead Plastic MSOP
(LTC DWG # 05-08-1660)
(LTC DWG # 05-08-1610)
0.189 – 0.197*
(4.801 – 5.004)
0.118 ± 0.004*
(3.00 ± 0.102)
7
5
8
6
8
7
6
5
0.118 ± 0.004**
(3.00 ± 0.102)
0.193 ± 0.006
(4.90 ± 0.15)
0.150 – 0.157**
(3.810 – 3.988)
0.228 – 0.244
(5.791 – 6.197)
1
2
3
4
1
0.053 – 0.069
2
3
4
0.040 ± 0.006
(1.02 ± 0.15)
0.034 ± 0.004
(0.86 ± 0.102)
0.010 – 0.020
(0.254 – 0.508)
× 45°
(1.346 – 1.752)
0.007
(0.18)
0° – 6° TYP
0.004 – 0.010
(0.101 – 0.254)
0.008 – 0.010
(0.203 – 0.254)
0°– 8° TYP
SEATING
PLANE
0.012
(0.30)
0.0256
REF
0.021 ± 0.006
(0.53 ± 0.015)
0.006 ± 0.004
(0.15 ± 0.102)
0.016 – 0.050
(0.406 – 1.270)
MSOP (MS8) 1098
0.050
(1.270)
BSC
0.014 – 0.019
(0.355 – 0.483)
TYP
(0.65)
BSC
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
* DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH,
PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
** DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.
INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
SO8 1298
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
LT1360/LT1361/LT1362
LT1363/LT1364/LT1365
LT1398/LT1399
Single/Dual/Quad 50MHz, 800V/µs, C-LoadTM Amplifiers
Single/Dual/Quad 70MHz, 1000V/µs C-Load Amplifiers
Dual/Triple 300MHz Current Feedback Amplifiers
±15V Operation, 1mV Max V , 1µA Max I
OS B
±15V Operation, 1.5mV Max V , 2µA Max I
OS
B
4.5mA Supply Current, 80mA Output Current, Shutdown
C-Load is a trademark of Linear Technology Corporation.
1813f LT/TP 0999 4K • PRINTED IN USA
LINEAR TECHNOLOGY CORPORATION 1999
12 LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
●
●
(408)432-1900 FAX:(408)434-0507 www.linear-tech.com
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