LT1813/LT1814
Dual/Quad 3mA, 100MHz,
750V/µs Operational Amplifiers
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FEATURES
DESCRIPTIO
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The LT®1813/LT1814 are dual and quad, low power, high
speed, very high slew rate operational amplifiers with
excellent DC performance. The LT1813/LT1814 feature
reduced supply current, lower input offset voltage, lower
input bias current and higher DC gain than other devices
with comparable bandwidth. The circuit topology is a
voltage feedback amplifier with the slewing characteristics of a current feedback amplifier.
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100MHz Gain Bandwidth Product
750V/µs Slew Rate
3.6mA Maximum Supply Current per Amplifier
Tiny 3mm x 3mm x 0.8mm DFN Package
8nV/√Hz Input Noise Voltage
Unity-Gain Stable
1.5mV Maximum Input Offset Voltage
4µA Maximum Input Bias Current
400nA Maximum Input Offset Current
40mA Minimum Output Current, VOUT = ±3V
±3.5V Minimum Input CMR, VS = ±5V
30ns Settling Time to 0.1%, 5V Step
Specified at ±5V, Single 5V Supplies
Operating Temperature Range: –40°C to 85°C
The output drives a 100Ω load to ±3.5V with ±5V supplies.
On a single 5V supply, the output swings from 1.1V to 3.9V
with a 100Ω load connected to 2.5V. The amplifiers are
stable with a 1000pF capacitive load making them useful
in buffer and cable driver applications.
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APPLICATIO S
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The LT1813/LT1814 are manufactured on Linear
Technology’s advanced low voltage complementary bipolar process. The LT1813 dual op amp is available in
8-pin MSOP, SO and 3mm x 3mm low profile (0.8mm)
dual fine pitch leadless packages (DFN). The quad LT1814
is available in 14-pin SO and 16-pin SSOP packages. A
single version, the LT1812, is also available (see separate
data sheet).
Active Filters
Wideband Amplifiers
Buffers
Video Amplification
Communication Receivers
Cable Drivers
Data Acquisition Systems
, LTC and LT are registered trademarks of Linear Technology Corporation.
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TYPICAL APPLICATIO
Bandpass Filter with Independently Settable Gain, Q and fC
R1
RQ
C
–
1/4 LT1814
+
1/4 LT1814
+
GAIN = R1
RG
fC =
1
2πRFC
C
R
RF
1/4 LT1814
BANDPASS
OUT
OUTPUT MAGNITUDE (6dB/DIV)
RF
+
Q = R1
RQ
0
–
R
1/4 LT1814
R = 499Ω
R1 = 499Ω
RF = 475Ω
RQ = 49.9Ω
RG = 499Ω
C = 3.3nF
fC = 100kHz
Q = 10
GAIN = 1
1k
+
–
–
RG
VIN
Filter Frequency Response
R
1814 TA01
10k
VS = ±5V
VIN = 5VP-P
DISTORTION:
2nd < –76dB
3rd < –90dB
ACROSS FREQ
RANGE
100k
1M
FREQUENCY (Hz)
10M
1814 TA02
18134fa
1
LT1813/LT1814
W W
W
AXI U
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ABSOLUTE
RATI GS (Note 1)
Total Supply Voltage (V+ to V –)
LT1813/LT1814 ................................................ 12.6V
LT1813HV ........................................................ 13.5V
Differential Input Voltage (Transient Only, Note 2) .. ±6V
Input Voltage ............................................................ ±VS
Output Short-Circuit Duration (Note 3) ........... Indefinite
Operating Temperature Range ................ – 40°C to 85°C
Specified Temperature Range (Note 8) .. – 40°C to 85°C
Maximum Junction Temperature ......................... 150°C
(DD Package) ................................................... 125°C
Storage Temperature Range ................ – 65°C to 150°C
(DD Package) ................................... – 65°C to 125°C
Lead Temperature (Soldering, 10 sec)................. 300°C
U
U
W
PACKAGE/ORDER I FOR ATIO
OUT A
1
8
V+
–IN A
2
7
OUT B
6
–IN B
5
+IN B
+IN A
3
V–
4
A
B
DD PACKAGE
8-LEAD (3mm × 3mm) PLASTIC DFN
TJMAX = 125°C, θJA = 160°C/W
UNDERSIDE METAL
INTERNALLY CONNECTED TO V –
ORDER PART
NUMBER
LT1813DDD*
LT1813CDD
LT1813IDD
DD PART MARKING**
LAAQ
ORDER PART
NUMBER
LT1813DMS8*
TOP VIEW
OUTA
–IN A
+IN A
V–
1
2
3
4
8
7
6
5
V+
OUT B
–IN B
+IN B
MS8 PACKAGE
8-LEAD PLASTIC MSOP
MS8 PART MARKING
LTGZ
TJMAX = 150°C, θJA = 250°C/W
TOP VIEW
TOP VIEW
8 V+
–IN A 2
7 OUT B
A
V–
6 –IN B
B
4
5 +IN B
–IN A 2
+IN A 3
V+
D
+IN B 5
–IN B 6
13 –IN D
12 +IN D
11 V –
4
OUT B 7
S8 PACKAGE
8-LEAD PLASTIC SO
–
A
+
+
–
OUT A 1
+IN A 3
14 OUT D
OUT A 1
TOP VIEW
+
–B
+ 10 +IN C
– 9 –IN C
C
8
OUT C
–IN A 2
+IN A 3
S PACKAGE
14-LEAD PLASTIC SO
TJMAX = 150°C, θJA = 110°C/W
S8 PART
MARKING
1813D
1813
1813I
813HVD
1813HV
813HVI
ORDER PART
NUMBER
LT1814CS
LT1814IS
16 OUT D
–
A
+
D
V+ 4
+IN B 5
–IN B 6
OUT B 7
NC 8
TJMAX = 150°C, θJA = 150°C/W
ORDER PART
NUMBER
LT1813DS8*
LT1813CS8
LT1813IS8
LT1813HVDS8*
LT1813HVCS8
LT1813HVIS8
OUT A 1
+
–
TOP VIEW
15 –IN D
14 +IN D
13 V –
+
–B
+ 12 +IN C
C–
11 –IN C
10 OUT C
9
NC
GN PACKAGE
16-LEAD PLASTIC SSOP
TJMAX = 150°C, θJA = 135°C/W
ORDER PART
NUMBER
LT1814CGN
LT1814IGN
GN PART
MARKING
1814
1814I
Consult LTC marketing for parts specified with wider operating temperature ranges. *See Note 9.
**The temperature grades are identified by a label on the shipping container.
18134fa
2
LT1813/LT1814
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VS = ±5V, VCM = 0V, unless otherwise noted. (Note 8)
SYMBOL
PARAMETER
VOS
Input Offset Voltage (Note 4)
∆VOS
∆T
Input Offset Voltage Drift (Note 7)
IOS
Input Offset Current
IB
CONDITIONS
MIN
TA = 0°C to 70°C
TA = – 40°C to 85°C
●
●
TA = 0°C to 70°C
TA = – 40°C to 85°C
●
●
TA = 0°C to 70°C
TA = – 40°C to 85°C
●
●
TA = 0°C to 70°C
TA = – 40°C to 85°C
●
●
Input Bias Current
TYP
MAX
UNITS
0.5
1.5
2
3
mV
mV
mV
10
10
15
30
µV/°C
µV/°C
50
400
500
600
nA
nA
nA
– 0.9
±4
±5
±6
µA
µA
µA
en
Input Noise Voltage Density
f = 10kHz
8
nV/√Hz
in
Input Noise Current Density
f = 10kHz
1
pA/√Hz
RIN
Input Resistance
VCM = 3.5V
Differential
CIN
Input Capacitance
VCM
Input Voltage Range
CMRR
Common Mode Rejection Ratio
Minimum Supply Voltage
PSRR
AVOL
VOUT
Power Supply Rejection Ratio
Large-Signal Voltage Gain
Maximum Output Swing
(Positive/Negative)
3
10
1.5
MΩ
MΩ
2
pF
±4.2
V
V
85
dB
dB
dB
Guaranteed by CMRR
TA = –40°C to 85°C
●
±3.5
±3.5
VCM = ±3.5V
TA = 0°C to 70°C
TA = – 40°C to 85°C
●
●
75
73
72
Guaranteed by PSRR
TA = –40°C to 85°C
●
VS = ±2V to ±5.5V
TA = 0°C to 70°C
TA = – 40°C to 85°C
78
76
75
97
●
●
dB
dB
dB
VS = ±2V to ±6.5V (LT1813HV)
TA = 0°C to 70°C
TA = – 40°C to 85°C
75
73
72
97
●
●
dB
dB
dB
VOUT = ±3V, RL = 500Ω
TA = 0°C to 70°C
TA = – 40°C to 85°C
1.5
1.0
0.8
3
●
●
V/mV
V/mV
V/mV
VOUT = ±3V, RL = 100Ω
TA = 0°C to 70°C
TA = – 40°C to 85°C
1.0
0.7
0.6
2.5
●
●
V/mV
V/mV
V/mV
RL = 500Ω, 30mV Overdrive
TA = 0°C to 70°C
TA = – 40°C to 85°C
±3.8
±3.7
±3.6
±4
●
●
V
V
V
RL = 100Ω, 30mV Overdrive
TA = 0°C to 70°C
TA = – 40°C to 85°C
±3.35
±3.25
±3.15
±3.5
●
●
V
V
V
±1.25
±2
±2
V
V
18134fa
3
LT1813/LT1814
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VS = ±5V, VCM = 0V, unless otherwise noted. (Note 8)
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
IOUT
Maximum Output Current
VOUT = ±3V, 30mV Overdrive
TA = 0°C to 70°C
TA = – 40°C to 85°C
±60
●
●
±40
±35
±30
mA
mA
mA
ISC
Output Short-Circuit Current
VOUT = 0V, 1V Overdrive (Note 3)
TA = 0°C to 70°C
TA = – 40°C to 85°C
±75
±60
±55
±100
●
●
mA
mA
mA
SR
Slew Rate
AV = –1 (Note 5)
TA = 0°C to 70°C
TA = – 40°C to 85°C
500
400
350
750
●
●
V/µs
V/µs
V/µs
40
MHz
100
MHz
MHz
MHz
200
MHz
FPBW
Full Power Bandwidth
6VP-P (Note 6)
GBW
Gain Bandwidth Product
f = 200kHz, RL = 500Ω
TA = 0°C to 70°C
TA = – 40°C to 85°C
●
●
75
65
60
MAX
UNITS
–3dB BW
–3dB Bandwidth
AV = 1, RL = 500Ω
tr, tf
Rise Time, Fall Time
AV = 1, 10% to 90%, 0.1V, RL = 100Ω
2
ns
tPD
Propagation Delay (Note 10)
AV = 1, 50% to 50%, 0.1V, RL = 100Ω
2.8
ns
OS
Overshoot
AV = 1, 0.1V, RL = 100Ω
25
%
tS
Settling Time
AV = –1, 0.1%, 5V
30
ns
THD
Total Harmonic Distortion
AV = 2, f = 1MHz, VOUT = 2VP-P, RL = 500Ω
–76
dB
dG
Differential Gain
AV = 2, VOUT = 2VP-P, RL = 150Ω
0.12
%
dP
Differential Phase
AV = 2, VOUT = 2VP-P, RL = 150Ω
0.07
DEG
ROUT
Output Resistance
AV = 1, f = 1MHz
Channel Separation
VOUT = ±3V, RL = 100Ω
TA = 0°C to 70°C
TA = – 40°C to 85°C
●
●
Per Amplifier
TA = 0°C to 70°C
TA = – 40°C to 85°C
●
●
3.6
4.5
5.0
mA
mA
mA
Per Amplifier,VS = ±6.5V, (LT1813HV only)
TA = 0°C to 70°C
TA = – 40°C to 85°C
●
●
4.0
5.0
5.5
mA
mA
mA
IS
Supply Current
82
81
80
0.4
Ω
100
dB
dB
dB
3
18134fa
4
LT1813/LT1814
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VS = 5V, VCM = 2.5V, RL to 2.5V, unless otherwise noted. (Note 8)
SYMBOL
PARAMETER
VOS
Input Offset Voltage (Note 4)
∆VOS
∆T
Input Offset Voltage Drift (Note 7)
IOS
Input Offset Current
IB
CONDITIONS
MIN
TA = 0°C to 70°C
TA = – 40°C to 85°C
●
●
TA = 0°C to 70°C
TA = – 40°C to 85°C
●
●
TA = 0°C to 70°C
TA = – 40°C to 85°C
●
●
TA = 0°C to 70°C
TA = – 40°C to 85°C
●
●
Input Bias Current
TYP
MAX
UNITS
0.7
2.0
2.5
3.5
mV
mV
mV
10
10
15
30
µV/°C
µV/°C
50
400
500
600
nA
nA
nA
–1
±4
±5
±6
µA
µA
µA
en
Input Noise Voltage Density
f = 10kHz
8
nV/√Hz
in
Input Noise Current Density
f = 10kHz
1
pA/√Hz
RIN
Input Resistance
VCM = 3.5V
Differential
CIN
Input Capacitance
VCM
Input Voltage Range
(Positive)
Guaranteed by CMRR
TA = –40°C to 85°C
●
Input Voltage Range
(Negative)
Guaranteed by CMRR
TA = –40°C to 85°C
●
Common Mode Rejection Ratio
VCM = 1.5V to 3.5V
TA = 0°C to 70°C
TA = – 40°C to 85°C
●
●
Guaranteed by PSRR
TA = –40°C to 85°C
●
VOUT = 1.5V to 3.5V, RL = 500Ω
TA = 0°C to 70°C
TA = – 40°C to 85°C
1.0
0.7
0.6
2
●
●
V/mV
V/mV
V/mV
VOUT = 1.5V to 3.5V, RL = 100Ω
TA = 0°C to 70°C
TA = – 40°C to 85°C
0.7
0.5
0.4
1.5
●
●
V/mV
V/mV
V/mV
RL = 500Ω, 30mV Overdrive
TA = 0°C to 70°C
TA = – 40°C to 85°C
3.9
3.8
3.7
4.1
●
●
V
V
V
RL = 100Ω, 30mV Overdrive
TA = 0°C to 70°C
TA = – 40°C to 85°C
3.7
3.6
3.5
3.9
●
●
V
V
V
RL = 500Ω, 30mV Overdrive
TA = 0°C to 70°C
TA = – 40°C to 85°C
●
●
RL = 100Ω, 30mV Overdrive
TA = 0°C to 70°C
TA = – 40°C to 85°C
●
●
CMRR
Minimum Supply Voltage
AVOL
VOUT
Large-Signal Voltage Gain
Maximum Output Swing
(Positive)
Maximum Output Swing
(Negative)
3
3.5
3.5
10
1.5
MΩ
MΩ
2
pF
4.2
V
V
0.8
73
71
70
1.5
1.5
82
2.5
V
V
dB
dB
dB
4
4
V
V
0.9
1.1
1.2
1.3
V
V
V
1.1
1.3
1.4
1.5
V
V
V
18134fa
5
LT1813/LT1814
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VS = 5V, VCM = 2.5V, RL to 2.5V, unless otherwise noted. (Note 8)
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
IOUT
Maximum Output Current
VOUT = 1.5V or 3.5V, 30mV Overdrive
TA = 0°C to 70°C
TA = – 40°C to 85°C
±35
●
●
±25
±20
±17
mA
mA
mA
ISC
Output Short-Circuit Current
VOUT = 2.5V, 1V Overdrive (Note 3)
TA = 0°C to 70°C
TA = – 40°C to 85°C
±55
±45
±40
±75
●
●
mA
mA
mA
SR
Slew Rate
AV = –1 (Note 5)
TA = 0°C to 70°C
TA = – 40°C to 85°C
200
150
125
350
●
●
V/µs
V/µs
V/µs
55
MHz
94
MHz
MHz
MHz
FPBW
Full Power Bandwidth
2VP-P (Note 6)
GBW
Gain Bandwidth Product
f = 200kHz, RL = 500Ω
TA = 0°C to 70°C
TA = – 40°C to 85°C
●
●
65
55
50
MAX
UNITS
–3dB BW
–3dB Bandwidth
AV = 1, RL = 500Ω
180
MHz
tr, tf
Rise Time, Fall Time
AV = 1, 10% to 90%, 0.1V, RL = 100Ω
2.1
ns
tPD
Propagation Delay (Note 10)
AV = 1, 50% to 50%, 0.1V, RL = 100Ω
3
ns
OS
Overshoot
AV = 1, 0.1V, RL = 100Ω
25
%
tS
Settling Time
AV = –1, 0.1%, 2V
30
ns
THD
Total Harmonic Distortion
AV = 2, f = 1MHz, VOUT = 2VP-P, RL = 500Ω
–75
dB
dG
Differential Gain
AV = 2, VOUT = 2VP-P, RL = 150Ω
0.22
%
dP
Differential Phase
AV = 2, VOUT = 2VP-P, RL = 150Ω
0.21
DEG
ROUT
Output Resistance
AV = 1, f = 1MHz
Channel Separation
VOUT = 1.5V to 3.5V, RL = 100Ω
TA = 0°C to 70°C
TA = – 40°C to 85°C
●
●
Per Amplifier
TA = 0°C to 70°C
TA = – 40°C to 85°C
●
●
IS
Supply Current
Note 1: Absolute Maximum Ratings are those values beyond which the life
of the device may be impaired.
Note 2: Differential inputs of ±6V 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 at the output with ±3V input
for ±5V supplies and 2VP-P at the output with a 3VP-P input for single 5V
supplies.
Note 6: Full power bandwidth is calculated from the slew rate:
FPBW = SR/2πVP
81
80
79
0.45
Ω
100
dB
dB
dB
2.9
4.0
5.0
5.5
mA
mA
mA
Note 7: This parameter is not 100% tested
Note 8: The LT1813C/LT1814C are guaranteed to meet specified
performance from 0°C to 70°C and is designed, characterized and
expected to meet the extended temperature limits, but is not tested at
–40°C and 85°C. The LT1813I/LT1814I are 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 10: Propagation delay is measured from the 50% point on the input
waveform to the 50% point on the output waveform.
18134fa
6
LT1813/LT1814
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Input Common Mode Range vs
Supply Voltage
Supply Current vs Temperature
V+
5
PER AMPLIFIER
VS = ± 2.5V
2
1
–1.0
INPUT BIAS CURRENT (µA)
INPUT COMMON MODE RANGE (V)
VS = ± 5V
3
0
– 0.5
4
SUPPLY CURRENT (mA)
Input Bias Current
vs Common Mode Voltage
–1.5
– 2.0
TA = 25°C
∆VOS < 1mV
2.0
1.5
1.0
TA = 25°C
VS = ± 5V
– 0.5
–1.0
–1.5
0.5
V–
100
125
0
1
4
3
2
5
SUPPLY VOLTAGE (± V)
Input Bias Current vs Temperature
INPUT VOLTAGE NOISE (nV/√Hz)
INPUT BIAS CURRENT (µA)
–1.0
–1.1
50
25
75
0
TEMPERATURE (°C)
100
in
10
1
en
1
125
10
100
V+
TA = 25°C
VIN = 30mV
– 0.5
OUTPUT VOLTAGE SWING (V)
OPEN-LOOP GAIN (dB)
67.5
RL = 500Ω
RL = 100Ω
65.0
62.5
50
25
75
0
TEMPERATURE (°C)
100
VS = ± 2.5V
65.0
62.5
60
100
125
1813/14 G07
1k
LOAD RESISTANCE (Ω)
–1.5
Output Voltage Swing
vs Load Current
V+
– 0.5
RL = 500Ω
RL = 100Ω
– 2.0
2.0
RL = 100Ω
1.5
1.0
RL = 500Ω
1
4
3
2
5
SUPPLY VOLTAGE (± V)
–1.0
–1.5
VS = ± 5V
VIN = 30mV
85°C
25°C
– 40°C
– 2.0
2.0
1.5
1.0
0.5
V–
0
10k
1813/14 G06
–1.0
0.5
60.0
–50 –25
VS = ± 5V
67.5
Output Voltage Swing
vs Supply Voltage
VS = ± 5V
VO = ± 3V
70.0
70.0
1813/14 G05
Open-Loop Gain vs Temperature
72.5
TA = 25°C
72.5
0.1
100k
1k
10k
FREQUENCY (Hz)
1813/14 G04
75.0
75.0
10
TA = 25°C
VS = ± 5V
AV = 101
RS = 10k
INPUT CURRENT NOISE (pA/√Hz)
– 0.9
–1.2
– 50 – 25
Open-Loop Gain
vs Resistive Load
100
– 0.8
5.0
1813/14 G03
Input Noise Spectral Density
VS = ± 5V
– 0.7
0
2.5
– 2.5
INPUT COMMON MODE VOLTAGE (V)
1813/14 G02
1813/14 G01
– 0.6
– 2.0
– 5.0
7
6
OPEN-LOOP GAIN (dB)
50
25
0
75
TEMPERATURE (°C)
OUTPUT VOLTAGE SWING (V)
0
–50 –25
6
7
1813/14 G02
V–
–60
–40
0
20
40
–20
OUTPUT CURRENT (mA)
60
1813/14 G09
18134fa
7
LT1813/LT1814
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Output Short-Circuit Current
vs Temperature
Settling Time vs Output Step
VS = ± 5V
100
4
SOURCE
3
SINK
90
2
1
0
–1
VS = ± 5V
AV = –1
RF = 500Ω
CF = 3pF
0.1% SETTLING
–2
–3
–4
–5
100
0
125
5
20
15
10
25
SETTLING TIME (ns)
30
Gain and Phase vs Frequency
–10
80
–20
60
±2.5V
30
±2.5V
±5V
40
±5V
20
20
10
0
–10
10k
100k
1M
10M
FREQUENCY (Hz)
100M
115
TA = 25°C
AV = 10
VIN = 0dBm
RL = 100Ω
–30
–40
–50
–60
–40
1000M
1M
10M
100M
FREQUENCY (Hz)
VS = ±2.5V
–4
–6
–8
–10
38
–50 –25
50
25
0
75
TEMPERATURE (°C)
1813/14 G15
Frequency Response
vs Capacitive Load, AV = –1
12
4
2
VS = ±2.5V
36
125
100
VS = ±5V
0
–2
TA = 25°C
AV = –1
V = ±5V
8 S
RF = RG = 500Ω
NO RL
CL= 1000pF
CL= 500pF
CL= 200pF
4
CL= 100pF
CL= 50pF
CL = 0
0
–4
–4
–12
–14
1M
1000M
TA = 25°C
AV = 2
RL = 100Ω
6
VS = ±5V
40
PHASE MARGIN
VS = ±5V
Frequency Response
vs Supply Voltage, AV = 2
VOLTAGE MAGNITUDE (dB)
–2
85
1813/14 G14
8
0
GBW
VS = ±2.5V
95
PHASE MARGIN
VS = ±2.5V
–90
100k
6
2
GBW
VS = ± 5V
–80
Frequency Response
vs Supply Voltage, AV = 1
TA = 25°C
AV = 1
NO RL
100M
RL = 500Ω
105
1813/14 G13
4
1M
10M
FREQUENCY (Hz)
Gain Bandwidth and Phase
Margin vs Temperature
–70
–20
0
100k
1813/14 G12
GAIN BANDWIDTH (MHz)
100
PHASE (DEG)
GAIN (dB)
0
PHASE
GAIN
40
TA = 25°C
VS = ± 5V
PHASE MARGIN (DEG)
50
120
CROSSTALK (dB)
60
0.1
0.001
10k
35
Crosstalk vs Frequency
TA = 25°C
AV = –1
RF = RG = 500Ω
AV = 1
1813/14 G11
1813/14 G10
70
AV = 10
1
0.01
VOLTAGE MAGNITUDE (dB)
75
0
25
50
TEMPERATURE (°C)
OUTPUT IMPEDANCE (Ω)
100
AV = 100
10
110
80
–50 –25
VOLTAGE MAGNITUDE (dB)
Output Impedance vs Frequency
5
OUTPUT STEP (V)
OUTPUT SHORT-CIRCUIT CURRENT (mA)
120
10M
100M
FREQUENCY (Hz)
500M
1813/14 G16
–6
1M
–8
10M
100M
FREQUENCY (Hz)
500M
1813/14 G17
1
10M
FREQUENCY (Hz)
100M 200M
1813/14 G18
18134fa
8
LT1813/LT1814
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Power Supply Rejection Ratio
vs Frequency
GBW
RL = 500Ω
90
GBW
RL = 100Ω
70
45
PHASE MARGIN
RL = 100Ω
40
PHASE MARGIN
RL = 500Ω
0
1
2
4
5
3
SUPPLY VOLTAGE (±V)
PHASE MARGIN (DEG)
GAIN BANDWIDTH (MHz)
TA = 25°C
POWER SUPPLY REJECTION RATIO (dB)
100
110
TA = 25°C
AV = 1
VS = ±5V
80
–PSRR
+PSRR
60
40
20
1k
7
10k
1M
100k
FREQUENCY (Hz)
10M
Slew Rate vs Supply Voltage
60
40
20
0
100M
1k
300
200
TA =25°C
AV = –1
V = ±5V
1000 RS = R = R = 500Ω
F
G
L
350
SR +
100M
Slew Rate vs Input Level
SLEW RATE (V/µs)
SR –
400
10M
1200
TA =25°C
AV = –1
V = ±1V
400 RIN= R = R = 500Ω
F
G
L
SR +
500
1M
100k
FREQUENCY (Hz)
10k
1813/14 G21
450
SLEW RATE (V/µs)
SLEW RATE (V/µs)
80
Slew Rate vs Supply Voltage
1000
600
TA = 25°C
VS = ±5V
1813/14 G20
1813/14 G19
TA =25°C
900 AV = –1
/2
V =V
800 RIN= R S(TOTAL)
F
G = RL = 500Ω
700
100
0
35
6
Common Mode Rejection Ratio
vs Frequency
COMMON MODE REJECTION RATIO (dB)
Gain Bandwidth and Phase
Margin vs Supply Voltage
SR –
300
250
SR +
800
SR –
600
400
100
0
200
1
4
3
2
5
SUPPLY VOLTAGE (±V)
7
6
0
1
4
3
2
5
SUPPLY VOLTAGE (±V)
1813/14 G22
800
TOTAL HARMONIC DISTORTION + NOISE (%)
SLEW RATE (V/µs)
900
SR –
VS = ± 5V
700
600
500
400
300
200
–50
SR – VS = ±2.5V
SR + VS = ±2.5V
–25
0
75
25
50
TEMPERATURE (°C)
0
100
125
1813/14 G25
1
2
4
3
5
6
INPUT LEVEL (VP-P)
1813/14 G23
Slew Rate vs Temperature
1000
200
7
7
8
1813/14 G24
Undistorted Output Swing
vs Frequency
Total Harmonic Distortion + Noise
vs Frequency
1100
SR +
VS = ± 5V
6
9
0.01
AV = – 1
8
AV = –1
OUTPUT VOLTAGE (VP-P)
0
0.005
AV = 1
0.002
TA = 25°C
VS = ± 5V
VO = 2VP-P
RL = 500Ω
0.001
10
100
6
5
4
3
2
1
1k
10k
FREQUENCY (Hz)
100k
1813/14 G26
AV = 1
7
VS = ± 5V
RL = 100Ω
2% MAX DISTORTION
0
100k
1M
10M
FREQUENCY (Hz)
100M
1813/14 G27
18134fa
9
LT1813/LT1814
U W
TYPICAL PERFOR A CE CHARACTERISTICS
2ND HARMONIC
RL = 100Ω
–50
–60
3RD HARMONIC
RL = 100Ω
–70
–80
3RD HARMONIC
RL = 500Ω
–90
–100
100k
2ND HARMONIC
RL = 500Ω
100
DIFFERENTIAL GAIN
RL = 150Ω
0.4
90
0.3
80
DIFFERENTIAL GAIN
RL = 1k
0.2
0.1
0.5
0
DIFFERENTIAL PHASE
RL = 150Ω
0.4
0.3
0.2
10M
1813/14 G28
Small-Signal Transient (AV = 1)
1813/14 G31
Large-Signal Transient (AV = 1)
1813/14 G34
AV = 1
70
60
50
AV = –1
40
30
10
0
0
1M
FREQUENCY (Hz)
TA = 25°C
VS = ±5V
20
DIFFERENTIAL PHASE
RL = 1k
0.1
DIFFERENTIAL GAIN (%)
HARMONIC DISTORTION (dB)
–40
AV = 2
VS = ±5V
VO = 2VP-P
Capacitive Load Handling
0.5
OVERSHOOT (%)
–30
Differential Gain and Phase
vs Supply Voltage
DIFFERENTIAL PHASE (DEG)
2nd and 3rd Harmonic Distortion
vs Frequency
4
10
8
6
TOTAL SUPPLY VOLTAGE (V)
12
10
100
1000
CAPACITIVE LOAD (pF)
1813/14 G30
1813/14 G29
Small-Signal Transient (AV = –1)
Small-Signal Transient
(AV = 1, CL = 100pF)
1813/14 G32
Large-Signal Transient (AV = –1)
1813/14 G35
10000
1813/14 G33
Large-Signal Transient
(AV = –1, CL = 200pF)
1813/14 G36
18134fa
10
LT1813/LT1814
U
W
U U
APPLICATIO S I FOR ATIO
Layout and Passive Components
The LT1813/LT1814 amplifiers are more tolerant of less
than ideal board layouts than other high speed amplifiers.
For optimum performance, a ground plane is recommended and trace lengths should be minimized, especially
on the negative input lead.
Low ESL/ESR bypass capacitors should be placed directly
at the positive and negative supply pins (0.01µF ceramics
are recommended). For high drive current applications,
additional 1µF to 10µF tantalums should be added.
series resistance for protection. This differential input
voltage generates a large internal current (up to 40mA),
which results in the high slew rate. In normal transient
closed-loop operation, this does not increase power dissipation significantly because of the low duty cycle of the
transient inputs. Sustained differential inputs, however,
will result in excessive power dissipation and therefore
this device should not be used as a comparator.
Capacitive Loading
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 LT1813/LT1814 are stable with capacitive loads from
0pF to 1000pF, which is outstanding for a 100MHz amplifier. The internal compensation circuitry accomplishes
this by sensing the load induced output pole and adding
compensation at the amplifier gain node as needed. As the
capacitive load increases, both the bandwidth and phase
margin decrease so there will be peaking in the frequency
domain and ringing 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 (e.g., 75Ω) should be placed in series with the
output. The receiving end of the cable should be terminated with the same value resistance to ground.
Input Considerations
Slew Rate
The inputs of the LT1813/LT1814 amplifiers are connected to the base of an NPN and PNP bipolar transistor in
parallel. The base currents are of opposite polarity and
provide first order bias current cancellation. Due to
variation in the matching of NPN and PNP beta, the polarity
of the input bias current can be positive or negative. The
offset current, however, does not depend on beta matching and is tightly controlled. Therefore, the use of balanced
source resistance at each input is recommended for
applications where DC accuracy must be maximized. For
example, with a 100Ω source resistance at each input, the
400nA maximum offset current results in only 40µV of
extra offset, while without balance the 4µA maximum
input bias current could result in a 0.4mV offset contribution.
The slew rate of the LT1813/LT1814 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/LT1814
is tested for a slew rate in a gain of – 1. Lower slew rates
occur in higher gain configurations.
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 1k are
used, a parallel capacitor of value:
CF > RG • CIN/RF
The inputs can withstand differential input voltages of up
to 6V without damage and without needing clamping or
Power Dissipation
The LT1813/LT1814 combine two or four amplifiers with
high speed and large output drive in a small package. It is
possible to exceed the maximum junction temperature
specification under certain conditions. Maximum junction
temperature (TJ) is calculated from the ambient temperature (TA) and power dissipation (PD) as follows:
TJ = TA + (PD • θJA)
18134fa
11
LT1813/LT1814
U
W
U U
APPLICATIO S I FOR ATIO
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 the supply voltage). Therefore PDMAX
is:
PDMAX = (V+ – V–) • (ISMAX) + (V+/2)2/RL or
PDMAX = (V+ – V–) • (ISMAX) + (V+ – VOMAX) • (VOMAX/RL)
Example: LT1814S at 70°C, VS = ±5V, RL=100Ω
PDMAX = (10V) • (4.5mA) + (2.5V)2/100Ω = 108mW
TJMAX = 70°C + (4 • 108mW) • (100°C/W) = 113°C
Circuit Operation
The LT1813/LT1814 circuit topology is a true voltage
feedback amplifier that has the slewing behavior of a
current feedback amplifier. The operation of the circuit can
be understood by referring to the Simplified Schematic.
Complementary NPN and PNP emitter followers buffer the
inputs and drive an internal resistor. The input voltage
appears across the resistor, generating current that is
mirrored into the high impedance node.
W
W
SI PLIFIED SCHE ATIC
Complementary followers form an output stage that buffers the gain node from the load. The input resistor, input
stage transconductance, and the capacitor on the high
impedance node determine the bandwidth. The slew rate
is determined by the current available to charge the gain
node capacitance. This current is the differential input
voltage divided by R1, so the slew rate is proportional to
the input step. Highest slew rates are therefore seen in the
lowest gain configurations.
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 a heavy load
(capacitive or resistive) is driven, the network is incompletely bootstrapped and adds to the compensation at the
high impedance node. The added capacitance moves the
unity-gain frequency away from the pole formed by 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° (zero phase margin),
and the amplifier remains stable. In this way, the LT1813/
LT1814 are stable with up to 1000pF capacitive loads in
unity gain, and even higher capacitive loads in higher
closed-loop gain configurations.
(one amplifier)
V+
R1
+IN
RC
CC
OUT
–IN
C
V–
1814 SS
18134fa
12
LT1813/LT1814
U
TYPICAL APPLICATIO
Filter Frequency Response
10
4MHz, 4th Order Butterworth Filter
0
–10
VOLTAGE GAIN (dB)
232Ω
274Ω
VIN
–
47pF
274Ω
220pF
562Ω
1/2 LT1813
+
470pF
–
22pF
–50
–60
–70
VOUT
1/2 LT1813
+
–40
VS = ±5V
VIN = 600mVP-P
PEAKING < 0.12dB
–80
–90
0.1
1813/14 TA01
1
10
FREQUENCY (MHz)
100
1813/14 TA02
Gain of 20 Composite Amplifier Drives Differential Load with Low Distortion
10k
1k
–
499Ω
499Ω
LOAD
68pF
1/4 LT1814
+
–
800Ω
+
1/4 LT1814
1/4 LT1814
+
665Ω
–30
–
232Ω
–20
9k
–
68pF
1/4 LT1814
+
VIN
1k
499Ω
GAIN = 20
–3dB BANDWIDTH = 10MHz
DISTORTION = –77dB AT 2MHz,
RL = 1k
499Ω
1814 TA03
18134fa
13
LT1813/LT1814
U
PACKAGE DESCRIPTIO
DD Package
8-Lead Plastic DFN (3mm × 3mm)
(Reference LTC DWG # 05-08-1698)
R = 0.115
TYP
5
0.38 ± 0.10
8
0.675 ±0.05
3.5 ±0.05
1.65 ±0.05
2.15 ±0.05 (2 SIDES)
1.65 ± 0.10
(2 SIDES)
3.00 ±0.10
(4 SIDES)
PACKAGE
OUTLINE
PIN 1
TOP MARK
(DD8) DFN 0203
0.28 ± 0.05
4
0.28 ± 0.05
0.75 ±0.05
0.200 REF
0.50
BSC
2.38 ±0.05
(2 SIDES)
1
0.50 BSC
2.38 ±0.10
(2 SIDES)
0.00 – 0.05
BOTTOM VIEW—EXPOSED PAD
NOTE:
1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (WEED-1)
2. ALL DIMENSIONS ARE IN MILLIMETERS
3. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE
MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE
4. EXPOSED PAD SHALL BE SOLDER PLATED
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
MS8 Package
8-Lead Plastic MSOP
(Reference LTC DWG # 05-08-1660)
0.889 ± 0.127
(.035 ± .005)
5.23
(.206)
MIN
3.2 – 3.45
(.126 – .136)
0.42 ± 0.04
(.0165 ± .0015)
TYP
3.00 ± 0.102
(.118 ± .004)
(NOTE 3)
0.65
(.0256)
BSC
8
7 6 5
0.52
(.206)
REF
RECOMMENDED SOLDER PAD LAYOUT
0.254
(.010)
3.00 ± 0.102
(.118 ± .004)
NOTE 4
4.90 ± 0.15
(1.93 ± .006)
DETAIL “A”
0° – 6° TYP
GAUGE PLANE
0.53 ± 0.015
(.021 ± .006)
DETAIL “A”
1
2 3
4
1.10
(.043)
MAX
0.86
(.034)
REF
0.18
(.077)
SEATING
PLANE
0.22 – 0.38
(.009 – .015)
TYP
0.65
(.0256)
BSC
0.13 ± 0.076
(.005 ± .003)
MSOP (MS8) 0802
NOTE:
1. DIMENSIONS IN MILLIMETER/(INCH)
2. DRAWING NOT TO SCALE
3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS.
MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.
INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX
18134fa
14
LT1813/LT1814
U
PACKAGE DESCRIPTIO
S8 Package
8-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610)
.189 – .197
(4.801 – 5.004)
NOTE 3
.045 ±.005
.050 BSC
7
8
.245
MIN
5
6
.160 ±.005
.150 – .157
(3.810 – 3.988)
NOTE 3
.228 – .244
(5.791 – 6.197)
.030 ±.005
TYP
1
RECOMMENDED SOLDER PAD LAYOUT
.010 – .020
× 45°
(0.254 – 0.508)
3
2
4
.053 – .069
(1.346 – 1.752)
.008 – .010
(0.203 – 0.254)
.004 – .010
(0.101 – 0.254)
0°– 8° TYP
.016 – .050
(0.406 – 1.270)
.050
(1.270)
BSC
.014 – .019
(0.355 – 0.483)
TYP
NOTE:
1. DIMENSIONS IN
INCHES
(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
S Package
14-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610)
.337 – .344
(8.560 – 8.738)
NOTE 3
.045 ±.005
.050 BSC
14
N
12
11
10
9
8
N
.245
MIN
.160 ±.005
.150 – .157
(3.810 – 3.988)
NOTE 3
.228 – .244
(5.791 – 6.197)
1
.030 ±.005
TYP
13
2
3
N/2
N/2
RECOMMENDED SOLDER PAD LAYOUT
1
.010 – .020
× 45°
(0.254 – 0.508)
.008 – .010
(0.203 – 0.254)
2
3
4
5
6
.053 – .069
(1.346 – 1.752)
.004 – .010
(0.101 – 0.254)
0° – 8° TYP
.016 – .050
(0.406 – 1.270)
NOTE:
1. DIMENSIONS IN
.014 – .019
(0.355 – 0.483)
TYP
7
.050
(1.270)
BSC
INCHES
(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)
S14 0502
18134fa
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 representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
15
LT1813/LT1814
U
TYPICAL APPLICATIO
Two Op Amp Instrumentation Amplifier
R5
220Ω
R1
10k
R4
10k
R2
1k
R3
1k
–
1/2
LT1813
–
1/2
LT1813
+
–
VOUT
+
VIN
+
(
⎡ R4 ⎤ ⎡ ⎛ 1⎞ ⎛ R2 R3 ⎞ R2 + R3
GAIN = ⎢ ⎥ ⎢1 + ⎜ ⎟ ⎜ + ⎟ +
R5
⎣ R3 ⎦ ⎢⎣ ⎝ 2⎠ ⎝ R1 R4 ⎠
) ⎤⎥ = 102
⎥
⎦
TRIM R5 FOR GAIN
TRIM R1 FOR COMMON MODE REJECTION
BW = 1MHz
1813/14 TA03
U
PACKAGE DESCRIPTIO
GN Package
16-Lead Plastic SSOP (Narrow .150 Inch)
.045 ±.005
.189 – .196*
(4.801 – 4.978)
(Reference LTC DWG # 05-08-1641)
16 15 14 13 12 11 10 9
.254 MIN
.009
(0.229)
REF
.150 – .165
.229 – .244
(5.817 – 6.198)
.0165 ± .0015
.150 – .157**
(3.810 – 3.988)
.0250 TYP
RECOMMENDED SOLDER PAD LAYOUT
1
NOTE:
1. CONTROLLING DIMENSION: INCHES
INCHES
2. DIMENSIONS ARE IN
(MILLIMETERS)
.015 ± .004
× 45°
(0.38 ± 0.10)
.007 – .0098
(0.178 – 0.249)
3. DRAWING NOT TO SCALE
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH
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
2 3
4
5 6
7
.053 – .068
(1.351 – 1.727)
8
.004 – .0098
(0.102 – 0.249)
0° – 8° TYP
.016 – .050
(0.406 – 1.270)
.0250
(0.635)
BSC
.008 – .012
(0.203 – 0.305)
GN16 (SSOP) 0502
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
LT1363/LT1364/LT1365
Single/Dual/Quad 70MHz, 1000V/µs, C-LoadTM Op Amps
±2.5V to ±15V Operation
LT1395/LT1396/LT1397
Single/Dual/Quad 400MHz Current Feedback Amplifiers
4.6mA Supply Current, 800V/µs, 80mA Output Current
LT1806/LT1807
Single/Dual 325MHz, 140V/µs Rail-to-Rail I/O Op Amps
Low Noise 3.5nV/√Hz
LT1809/LT1810
Single/Dual 180MHz, 350V/µs Rail-to-Rail I/O Op Amps
Low Distortion –90dBc at 5MHz
LT1812
Single 3mA, 100MHz, 750V/µs Op Amp
Single Version of LT1813/LT1814; 50µA Shutdown Option
LT1815/LT1816/LT1817
Single/Dual/Quad 220MHz, 1500V/µs Op Amps
6.5mA Supply Current, 6nV/√Hz Input Noise
C-Load is a trademark of Linear Technology Corporation.
18134fa
16
Linear Technology Corporation
LT/TP 0503 1K REV A • PRINTED IN THE USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507
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www.linear.com
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