LT1819IS8#TRPBF [Linear]
LT1819 - 400MHz, 2500V/µs, 9mA Dual Operational Amplifiers; Package: SO; Pins: 8; Temperature Range: -40°C to 85°C;
| 型号： | LT1819IS8#TRPBF |
| 厂家： | 
Linear |
| 描述： | LT1819 - 400MHz, 2500V/µs, 9mA Dual Operational Amplifiers; Package: SO; Pins: 8; Temperature Range: -40°C to 85°C 运算放大器 放大器电路 光电二极管 |
| 文件： | 总17页 (文件大小：398K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LT1818/LT1819
400MHz, 2500V/µs, 9mA
Single/Dual Operational Amplifiers
U
DESCRIPTIO
FEATURES
The LT®1818/LT1819 are single/dual wide bandwidth,
high slew rate, low noise and distortion operational ampli-
fiers with excellent DC performance. The LT1818/LT1819
have been designed for wider bandwidth and slew rate,
much lower input offset voltage and lower noise and
distortion than devices with comparable supply current.
The circuit topology is a voltage feedback amplifier with
the excellent slewing characteristics of a current feedback
amplifier.
■
400MHz Gain Bandwidth Product
■
2500V/µs Slew Rate
■
■
■
■
■
■
■
■
■
■
■
■
–85dBc Distortion at 5MHz
9mA Supply Current Per Amplifier
Space Saving SOT-23 and MS8 Packages
6nV/√Hz Input Noise Voltage
Unity-Gain Stable
1.5mV Maximum Input Offset Voltage
8µA Maximum Input Bias Current
800nA Maximum Input Offset Current
Theoutputdrivesa100Ωloadto±3.8Vwith±5Vsupplies.
40mA Minimum Output Current, VOUT = ±3V
±3.5V Minimum Input CMR, VS = ±5V
Specified at ±5V, Single 5V Supplies
On a single 5V supply, the output swings from 1V to 4V
witha100Ωloadconnectedto2.5V. Theamplifierisunity-
gainstablewitha20pFcapacitiveloadwithouttheneedfor
a series resistor. Harmonic distortion is –85dBc up to
5MHz for a 2VP-P output at a gain of 2.
Operating Temperature Range: –40°C to 85°C
U
APPLICATIO S
■
The LT1818/LT1819 are manufactured on Linear
Technology’s advanced low voltage complementary bipo-
lar process. The LT1818 (single op amp) is available in
SOT-23 and SO-8 packages; the LT1819 (dual op amp) is
available in MSOP-8 and SO-8 packages.
Wideband Amplifiers
Buffers
Active Filters
■
■
■
Video and RF Amplification
■
Communication Receivers
, LTC and LT are registered trademarks of Linear Technology Corporation.
■
Cable Drivers
■
Data Acquisition Systems
U
TYPICAL APPLICATIO
FFT of Single Supply ADC Driver
0
Single Supply Unity-Gain ADC Driver for Oversampling Applications
f
f
= 5.102539MHz
= 50Msps
IN
S
V
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
= 300mV
5V
5V
IN
P-P
SFDR = 78dB
8192 POINT FFT
NO WINDOWING
OR AVERAGING
2.5VDC
±1VAC
+
–
51.1Ω
LTC1744
14 BITS
50Msps
(SET FOR 2V
FULL SCALE)
+
–
LT1818
A
A
IN
IN
18pF
P-P
2.5V
2
3
18189 TA01
0
5M
10M
15M
20M
25M
FREQUENCY (Hz)
18189 TA02
18189f
1
LT1818/LT1819
W W
U W
ABSOLUTE AXI U RATI GS
(Note 1)
Specified Temperature Range (Note 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
Total Supply Voltage (V+ to V–)........................... 12.6V
Differential Input Voltage
(Transient Only, Note 2) ..................................... ±6V
Output Short-Circuit Duration (Note 3)........... Indefinite
Operating Temperature Range (Note 8) .. –40°C to 85°C
U W
U
PACKAGE/ORDER I FOR ATIO
ORDER PART
NUMBER
LT1818CS5
LT1818IS5
ORDER PART
NUMBER
TOP VIEW
TOP VIEW
+
OUT A
–IN A
+IN A
1
2
3
4
8 V
LT1819CMS8
LT1819IMS8
OUT 1
1
2
3
5
4
V+
7 OUT B
6 –IN B
5 +IN B
–
A
V
B
+
–
–
V
+IN
–IN
S5 PART*
MARKING
LTF7
MS8 PART
MARKING
MS8 PACKAGE
8-LEAD PLASTIC MSOP
S5 PACKAGE
5-LEAD PLASTIC SOT-23
TJMAX = 150°C, θJA = 250°C/W (NOTE 10)
LTE7
LTE5
TJMAX = 150°C, θJA = 250°C/W (NOTE 10)
ORDER PART
NUMBER
ORDER PART
NUMBER
TOP VIEW
TOP VIEW
+
NC
–IN
+IN
1
2
3
4
8
7
6
5
NC
OUT A
–IN A
+IN A
1
2
3
4
8
7
6
5
V
LT1818CS8
LT1818IS8
LT1819CS8
LT1819IS8
+
V
OUT B
–IN B
+IN B
–
+
A
OUT
NC
B
–
–
S8 PART
MARKING
1818
1818I
S8 PART
MARKING
1819
1819I
V
V
S8 PACKAGE
8-LEAD PLASTIC SO
S8 PACKAGE
8-LEAD PLASTIC SO
TJMAX = 150°C, θJA = 150°C/W (NOTE 10)
TJMAX = 150°C, θJA = 150°C/W (NOTE 10)
*The temperature grade is identified by a label on the shipping container. Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. (Note 9) VS = ±5V, VCM = 0V, unless otherwise noted.
SYMBOL PARAMETER
Input Offset Voltage
CONDITIONS
MIN
TYP
MAX
UNITS
V
(Note 4)
0.2
1.5
2.0
3.0
mV
mV
mV
OS
T = 0°C to 70°C
●
●
A
T = –40°C to 85°C
A
∆V /∆T Input Offset Voltage Drift
OS
T = 0°C to 70°C (Note 7)
A
●
●
10
10
15
30
µV/°C
µV/°C
A
T = –40°C to 85°C (Note 7)
I
I
Input Offset Current
Input Bias Current
60
800
1000
1200
nA
nA
nA
OS
B
T = 0°C to 70°C
A
●
●
A
T = –40°C to 85°C
–2
±8
±10
±12
µA
µA
µA
T = 0°C to 70°C
●
●
A
T = –40°C to 85°C
A
e
Input Noise Voltage Density
Input Noise Current Density
f = 10kHz
f = 10kHz
6
nV/√Hz
n
i
1.2
pA/√Hz
n
18189f
2
LT1818/LT1819
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. (Note 9) VS = ±5V, VCM = 0V, unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
–
+
R
IN
Input Resistance
V
CM
= V + 1.5V to V – 1.5V
1.5
5
750
MΩ
kΩ
Differential
C
V
Input Capacitance
Input Voltage Range
(Positive/Negative)
1.5
±4.2
pF
V
V
IN
Guaranteed by CMRR
±3.5
±3.5
CM
T = –40°C to 85°C
●
A
CMRR
Common Mode Rejection Ratio
V
= ±3.5V
75
73
72
85
dB
dB
dB
CM
A
A
T = 0°C to 70°C
●
●
T = –40°C to 85°C
Minimum Supply Voltage
Guaranteed by PSRR
T = –40°C to 85°C
±1.25
±2
±2
V
V
●
A
PSRR
Power Supply Rejection Ratio
V = ±2V to ±5.5V
78
76
75
97
dB
dB
dB
S
T = 0°C to 70°C
●
●
A
T = –40°C to 85°C
A
A
V
Large-Signal Voltage Gain
V
V
V
= ±3V, R = 500Ω
1.5
1.0
0.8
1.0
0.7
0.6
82
81
80
±3.8
±3.7
±3.6
±3.50
±3.25
±3.15
±40
±35
±30
±100
±90
±70
2.5
6
V/mV
V/mV
V/mV
V/mV
V/mV
V/mV
dB
dB
dB
V
V
V
V
V
V
mA
mA
mA
mA
mA
mA
VOL
OUT
A
A
L
T = 0°C to 70°C
●
●
T = –40°C to 85°C
= ±3V, R = 100Ω
OUT
A
A
L
T = 0°C to 70°C
●
●
T = –40°C to 85°C
Channel Separation
= ±3V, LT1819
T = 0°C to 70°C
100
±4.1
±3.8
±70
±200
OUT
A
A
●
●
T = –40°C to 85°C
R = 500Ω, 30mV Overdrive
Output Swing(Positive/Negative)
OUT
L
T = 0°C to 70°C
T = –40°C to 85°C
●
●
A
A
R = 100Ω, 30mV Overdrive
L
T = 0°C to 70°C
T = –40°C to 85°C
●
●
A
A
I
I
Output Current
V = ±3V, 30mV Overdrive
OUT
OUT
SC
T = 0°C to 70°C
T = –40°C to 85°C
●
●
A
A
Output Short-Circuit Current
Slew Rate
V
OUT
= 0V, 1V Overdrive (Note 3)
T = 0°C to 70°C
●
●
A
A
T = –40°C to 85°C
SR
A = 1
V
2500
1800
V/µs
A = –1 (Note 5)
V
900
750
600
V/µs
V/µs
V/µs
T = 0°C to 70°C
T = –40°C to 85°C
●
●
A
A
FPBW
GBW
Full Power Bandwidth
Gain Bandwidth Product
6V (Note 6)
95
400
MHz
P-P
f = 4MHz, R = 500Ω
270
260
250
MHz
MHz
MHz
L
T = 0°C to 70°C
●
●
A
T = –40°C to 85°C
A
t , t
Rise Time, Fall Time
Propagation Delay
Overshoot
A = 1, 10% to 90%, 0.1V Step
0.6
1.0
20
ns
ns
%
ns
r
f
V
t
A = 1, 50% to 50%, 0.1V Step
V
PD
OS
A = 1, 0.1V, R = 100Ω
V L
t
Settling Time
A = –1, 0.1%, 5V
V
10
S
HD
Harmonic Distortion
HD2, A = 2, f = 5MHz, V
= 2V , R = 500Ω
–85
–89
dBc
dBc
V
OUT
OUT
P-P
L
HD3, A = 2, f = 5MHz, V
= 2V , R = 500Ω
P-P L
V
dG
dP
Differential Gain
Differential Phase
Supply Current
A = 2, R = 150Ω
0.07
0.02
9
%
V
L
A = 2, R = 150Ω
DEG
V
L
I
Per Amplifier
T = 0°C to 70°C
10
13
14
mA
mA
mA
S
●
●
A
T = –40°C to 85°C
A
18189f
3
LT1818/LT1819
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C (Note 9). VS = 5V, 0V; VCM = 2.5V, RL to 2.5V unless otherwise noted.
SYMBOL PARAMETER
Input Offset Voltage
CONDITIONS
MIN
TYP
MAX
UNITS
V
(Note 4)
0.4
2.0
2.5
3.5
mV
mV
mV
OS
T = 0°C to 70°C
●
●
A
T = –40°C to 85°C
A
∆V /∆T Input Offset Voltage Drift
OS
(Note 7)
T = 0°C to 70°C
●
●
10
10
15
30
µV/°C
µV/°C
A
T = –40°C to 85°C
A
I
I
Input Offset Current
Input Bias Current
60
800
1000
1200
nA
nA
nA
OS
B
T = 0°C to 70°C
A
●
●
A
T = –40°C to 85°C
–2.4
±8
±10
±12
µA
µA
µA
T = 0°C to 70°C
●
●
A
T = –40°C to 85°C
A
e
Input Noise Voltage Density
Input Noise Current Density
Input Resistance
f = 10kHz
6
nV/√Hz
pA/√Hz
n
i
f = 10kHz
1.4
n
–
+
R
V
= V + 1.5V to V – 1.5V
1.5
5
750
MΩ
kΩ
IN
CM
Differential
C
V
Input Capacitance
1.5
4.2
pF
IN
Input Voltage Range (Positive)
Guaranteed by CMRR
3.5
3.5
V
V
CM
T = –40°C to 85°C
●
●
A
Input Voltage Range (Negative)
Common Mode Rejection Ratio
Guaranteed by CMRR
0.8
82
1.5
1.5
V
V
T = –40°C to 85°C
A
CMRR
PSRR
V
= 1.5V to 3.5V
73
71
70
dB
dB
dB
CM
T = 0°C to 70°C
●
●
A
T = –40°C to 85°C
A
Minimum Supply Voltage
Guaranteed by PSRR
T = –40°C to 85°C
±1.25
±2
±2
V
V
●
A
Power Supply Rejection Ratio
V = 4V to 11V
78
76
75
97
dB
dB
dB
S
T = 0°C to 70°C
T = –40°C to 85°C
●
●
A
A
A
Large-Signal Voltage Gain
V
V
V
= 1.5V to 3.5V, R = 500Ω
1.0
0.7
0.6
2
4
V/mV
V/mV
V/mV
VOL
OUT
L
T = 0°C to 70°C
●
●
A
T = –40°C to 85°C
A
= 1.5V to 3.5V, R = 100Ω
0.7
0.5
0.4
V/mV
V/mV
V/mV
OUT
A
A
L
T = 0°C to 70°C
T = –40°C to 85°C
●
●
Channel Separation
= 1.5V to 3.5V, LT1819
T = 0°C to 70°C
T = –40°C to 85°C
81
80
79
100
4.2
4
dB
dB
dB
OUT
A
A
●
●
V
Output Swing(Positive)
R = 500Ω, 30mV Overdrive
3.9
3.8
3.7
V
V
V
OUT
L
T = 0°C to 70°C
T = –40°C to 85°C
●
●
A
A
R = 100Ω, 30mV Overdrive
3.7
3.6
3.5
V
V
V
L
T = 0°C to 70°C
T = –40°C to 85°C
●
●
A
A
Output Swing(Negative)
R = 500Ω, 30mV Overdrive
0.8
1
1.1
1.2
1.3
V
V
V
L
T = 0°C to 70°C
●
●
A
T = –40°C to 85°C
A
R = 100Ω, 30mV Overdrive
1.3
1.4
1.5
V
V
V
L
T = 0°C to 70°C
T = –40°C to 85°C
●
●
A
A
18189f
4
LT1818/LT1819
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C (Note 9). VS = 5V, 0V; VCM = 2.5V, RL to 2.5V unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
I
Output Current
V
= 1.5V or 3.5V, 30mV Overdrive
OUT
±30
±25
±20
±50
mA
mA
mA
OUT
T = 0°C to 70°C
●
●
A
T = –40°C to 85°C
A
I
Output Short-Circuit Current
Slew Rate
V
= 2.5V, 1V Overdrive (Note 3)
T = 0°C to 70°C
T = –40°C to 85°C
±80
±70
±50
±140
mA
mA
mA
SC
OUT
●
●
A
A
SR
A = 1
V
1000
800
V/µs
A = –1 (Note 5)
V
450
375
300
V/µs
V/µs
V/µs
T = 0°C to 70°C
T = –40°C to 85°C
●
●
A
A
FPBW
GBW
Full Power Bandwidth
2V (Note 6)
125
360
MHz
P-P
Gain Bandwidth Product
f = 4MHz, R = 500Ω
240
230
220
MHz
MHz
MHz
L
T = 0°C to 70°C
●
●
A
T = –40°C to 85°C
A
t , t
Rise Time, Fall Time
Propagation Delay
Overshoot
A = 1, 10% to 90%, 0.1V Step
0.7
1.1
20
ns
ns
%
r
f
V
t
A = 1, 50% to 50%, 0.1V Step
V
PD
OS
HD
A = 1, 0.1V, R = 100Ω
V L
Harmonic Distortion
HD2, A = 2, f = 5MHz, V
= 2V , R = 500Ω
= 2V , R = 500Ω
–72
–74
dBc
dBc
V
OUT
OUT
P-P
L
HD3, A = 2, f = 5MHz, V
V
P-P L
dG
dP
Differential Gain
Differential Phase
Supply Current
A = 2, R = 150Ω
0.07
0.07
8.5
%
V
L
A = 2, R = 150Ω
DEG
V
L
I
Per Amplifier
T = 0°C to 70°C
10
13
14
mA
mA
mA
S
●
●
A
T = –40°C to 85°C
A
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 ±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 7: This parameter is not 100% tested.
Note 8: The LT1818C/LT1818I and LT1819C/LT1819I are guaranteed
functional over the operating temperature range of –40°C to 85°C.
Note 9: The LT1818C/LT1819C 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 LT1818I/LT1819I are guaranteed to meet the
extended temperature limits.
Note 4: Input offset voltage is pulse tested and is exclusive of warm-up
drift.
Note 5: With ±5V supplies, slew rate is tested in a closed-loop gain of –1
by measuring the rise time of the output from –2V to 2V with an output
step from –3V to 3V. With single 5V supplies, slew rate is tested in a
closed-loop gain of –1 by measuring the rise time of the output from 1.5V
to 3.5V with an output step from 1V to 4V. Falling edge slew rate is not
production tested, but is designed, characterized and expected to be within
10% of the rising edge slew rate.
Note 10: Thermal resistance (θ ) varies with the amount of PC board
JA
metal connected to the package. The specified values are for short traces
connected to the leads. If desired, the thermal resistance can be
–
significantly reduced by connecting the V pin to a large metal area.
18189f
5
LT1818/LT1819
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Input Common Mode Range
Input Bias Current vs Common
Mode Voltage
Supply Current vs Temperature
vs Supply Voltage
+
12
10
8
2
0
V
T
= 25°C
= ±5V
T
= 25°C
OS
PER AMPLIFIER
A
S
A
–0.5
–1.0
–1.5
–2.0
V
∆V < 1mV
V
= ±5V
S
S
–2
–4
–6
–8
V
= ±2.5V
6
2.0
1.5
1.0
0.5
4
2
–
0
V
0
2.5
5
–50 –25
0
25
50
75 100 125
–5
–2.5
0
2
3
4
5
6
7
1
TEMPERATURE (°C)
SUPPLY VOLTAGE (± V)
INPUT COMMON MODE VOLTAGE (V)
18189 G03
18189 G01
18189 G02
Input Bias Current vs Temperature
Input Noise Spectral Density
Open-Loop Gain vs Resistive Load
100
10
1
10
0
80
V
CM
= 0V
T
A
= 25°C
= ±5V
= 101
= 10k
T
= 25°C
A
V
A
S
V
–0.4
77
74
71
68
65
62
R
S
–0.8
–1.2
–1.6
–2.0
–2.4
i
n
1
e
n
V
= ±5V
S
V
V
= ±5V
S
S
V
S
= ±2.5V
= ±2.5V
0.1
100k
–2.8
10
100
1k
FREQUENCY (Hz)
10k
50
100 125
–50 –25
0
25
75
100
1k
LOAD RESISTANCE (Ω)
10k
TEMPERATURE (°C)
18189 G05
18189 G06
18189 G04
Output Voltage Swing
vs Supply Voltage
Output Voltage Swing
vs Load Current
Open-Loop Gain vs Temperature
+
5
4
3
2
V
80
77
74
71
68
65
62
T
= 25°C
OS
T
= 25°C
V = ±5V
S
OS
V
S
V
O
= ±5V
= ±3V
A
A
–0.5
–1.0
–1.5
–2.0
∆V = 30mV
R
= 500Ω
= 100Ω
L
R
L
= 100Ω
∆V = 30mV
R
L
SOURCE
–2
–3
–4
–5
SINK
2.0
1.5
1.0
0.5
R
L
= 500Ω
R
= 100Ω
L
R
= 500Ω
L
–
V
0
2
3
4
5
6
7
–120 –80 –40
0
40
80
120
50
100 125
1
–50 –25
0
25
75
SUPPLY VOLTAGE (± V)
OUTPUT CURRENT (mA)
TEMPERATURE (°C)
18189 G08
18189 G09
18189 G07
18189f
6
LT1818/LT1819
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Output Short-Circuit Current
vs Temperature
Output Current vs Temperature
Output Impedance vs Frequency
100
10
150
125
100
75
240
200
160
120
V
V
= ± 5V
= ±1V
S
IN
SOURCE
SINK
SOURCE, V = ±5V
S
A
V
= 100
SINK, V = ±5V
SOURCE, V = ±2.5V
S
S
A
V
= 10
1
SINK, V = ±2.5V
S
50
25
0
80
40
0
A
= 1
V
0.1
0.01
∆V = 30mV
OS
V
OUT
V
OUT
= ±3V FOR V = ±5V
S
T
= 25°C
= ± 5V
A
S
= ±1V FOR V = ±2.5V
S
V
50
0
TEMPERATURE (˚C)
100 125
10k
100k
1M
10M
100M
–50 –25
25
75
50
100 125
–50 –25
0
25
75
FREQUENCY (Hz)
TEMPERATURE (°C)
18189 G12
18189 G11
18189 G10
Gain Bandwidth and Phase
Margin vs Temperature
Gain and Phase vs Frequency
80
70
60
50
180
160
140
120
440
400
360
R
= 500Ω
L
GBW
= ±5V
V
S
GBW
= ±2.5V
PHASE
GAIN
V
S
40
30
100
80
20
10
60
40
20
0
50
40
30
PHASE MARGIN
= ±2.5V
PHASE MARGIN
= ±5V
V
V
S
S
0
T
= 25°C
A
V
L
A
= –1
–10
R
= 500Ω
–20
10k
–20
100M 500M
100k
1M
10M
–50 –25
0
25
50
75 100 125
FREQUENCY (Hz)
TEMPERATURE (°C)
18189 G13
18189 G15
Gain vs Frequency, AV = 2
Gain vs Frequency, AV = 1
Gain vs Frequency, AV = –1
5
0
5
0
10
5
R
= 500Ω
T
= 25°C
= 1
= 500Ω
L
A
V
L
A
V
S
= ±5V
V
S
= ±5V
R
V
S
= ±2.5V
V = ±2.5V
S
R
= 100Ω
L
0
–5
–5
T
A
V
= 25°C
= 2
A
V
S
F
F
–5
–10
T
= 25°C
= –1
= R = R = 500Ω
F G
A
V
L
= ±5V
A
R = R = 500Ω
C = 1pF
G
R
–10
–10
1M
10M
100M
500M
1M
10M
FREQUENCY (Hz)
100M 300M
1M
10M
FREQUENCY (Hz)
100M 300M
FREQUENCY (Hz)
18189 G16
18189 G18
18189 G17
18189f
7
LT1818/LT1819
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
450
400
350
300
T
A
V
= 25°C
= 1
= ±5V
T = 25°C
A
T
= 25°C
A
V
S
GBW
A
R
R
= 500Ω
L
V
S
= ±2.5V
V
S
= ±5V
PSRR
+PSRR
GBW
= 100Ω
L
PHASE MARGIN
= 100Ω
45
R
L
40
35
30
PHASE MARGIN
R
L
= 500Ω
1k
10k
100k
1M
10M
100M
1k
10k
100k
1M
10M
100M
2
4
5
6
3
FREQUENCY (Hz)
FREQUENCY (Hz)
SUPPLY VOLTAGE (±V)
18189 G20
18189 G21
18189 G19
Slew Rate vs Input Step
Slew Rate vs Supply Voltage
Slew Rate vs Temperature
2000
1500
1000
500
0
2000
1600
1200
800
400
0
2400
2000
1600
1200
T
=25°C
T
=25°C
= –1
A
V
F
A
V
S
A
= –1
A
V
V
= 6V
R
= R = R = 500Ω
G
= ±5V
IN
P-P
P-P
L
V
S
= ±5V
R
= R = R = 500Ω
G L
F
+
–
SR
SR
V
= 2V
V
S
= ±2.5V
IN
800
400
0
A
V
= –1
R = R = R = 500Ω
F
G
L
0
2
3
4
5
6
7
1
50
TEMPERATURE (°C)
100 125
4
5
–50 –25
0
25
75
2
3
6
SUPPLY VOLTAGE (±V)
INPUT STEP (V
)
P-P
18189 G23
18189 G24
18189 G22
Differential Gain and Phase
vs Supply Voltage
Distortion vs Frequency, AV = 2
Distortion vs Frequency, AV = –1
–60
–70
–60
–70
T
= 25°C
A
2ND, R = 100
L
2ND, R = 100
L
0.10
0.08
0.06
0.04
0.02
0
DIFFERENTIAL GAIN
= 150Ω
3RD, R = 100
L
2ND, R = 500
L
R
L
–80
–80
2ND, R = 500
L
0.12
0.10
0.08
0.06
0.04
0.02
0
3RD, R = 100
L
3RD, R = 500
L
–90
–90
3RD, R = 500
L
–100
–110
–120
–100
–110
–120
DIFFERENTIAL PHASE
A
V
V
= –1
= ±5V
= 2V
A
V
V
= 2
= ±5V
= 2V
V
S
O
V
S
O
R
= 150Ω
L
P-P
P-P
2
3
4
5
6
1M
10M
2M
5M
1M
10M
2M
5M
SUPPLY VOLTAGE (±V)
FREQUENCY (Hz)
FREQUENCY (Hz)
18189 G25
18189 G26
18189 G27
18189f
8
LT1818/LT1819
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Channel Separation
vs Frequency
Distortion vs Frequency, AV = 1
0.1% Settling Time
–60
–70
110
100
90
80
70
60
50
40
30
20
10
A
V
V
= 1
= ±5V
= 2V
V
S
O
INPUT
TRIGGER
(1V/DIV)
P-P
2ND, R = 100
L
3RD, R = 100
L
–80
OUTPUT
SETTLING
RESIDUE
(5mV/DIV)
–90
–100
–110
–120
T
= 25°C
= ±5V
= –1
3RD, R = 500
L
A
S
V
VS = ±5V
5ns/DIV
18189 G30
V
A
VOUT = ±2.5V
2ND, R = 500
L
SETTLING TIME = 9ns
AV = –1
RF = RG = 500Ω
CF = 4.1pF
R
= R = R = 500Ω
F
G
L
1M
10M
2M
5M
10k
100k
1M
10M
100M
1G
FREQUENCY (Hz)
FREQUENCY (Hz)
18188 G29
18189 G28
Small-Signal Transient, 20dB Gain
Large-Signal Transient, AV = –1
20mV/DIV
2V/DIV
10ns/DIV
18189 G31
V
S = ±5V
5ns/DIV
18189 G32
Large-Signal Transient, AV = 1
Large-Signal Transient, AV = –1
1V/DIV
1V/DIV
V
S = ±5V
10ns/DIV
18189 G33
V
S = ±5V
10ns/DIV
18189 G34
18189f
9
LT1818/LT1819
U
W U U
APPLICATIO S I FOR ATIO
load, aresistorof10Ωto50Ωmustbeconnectedbetween
the output and the capacitive load to avoid ringing or
oscillation (see RS in Figure 1). The feedback must still be
taken directly from the output so that the series resistor
will isolate the capacitive load to ensure stability.
Layout and Passive Components
As with all high speed amplifiers, the LT1818/LT1819
require some attention to board layout. A ground plane is
recommended and trace lengths should be minimized,
especially on the negative input lead.
Input Considerations
Low ESL/ESR bypass capacitors should be placed directly
at the positive and negative supply (0.01µF ceramics are
recommended). For high drive current applications, addi-
tional 1µF to 10µF tantalums should be added.
The inputs of the LT1818/LT1819 amplifiers are con-
nected to the bases of NPN and PNP bipolar transistors
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
useofbalancedsourceresistanceateachinputisrecom-
mended for applications where DC accuracy must be
maximized. For example, with a 100Ω source resistance
at each input, the 800nA maximum offset current results
in only 80µV of extra offset, while without balance the
8µA maximum input bias current could result in an
0.8mV offset condition.
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 500Ω
are used, a parallel capacitor of value
CF > RG • CIN/RF
should be used to cancel the input pole and optimize
dynamic performance (see Figure 1). 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 inputs can withstand differential input voltages of up
to 6V without damage and without needing clamping or
series resistance for protection. This differential input
voltage generates a large internal current (up to 50mA),
which results in the high slew rate. In normal transient
closed-loop operation, this does not increase power dis-
sipation 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.
In high closed-loop gain configurations, RF >> RG, and no
CF need to be added. To optimize the bandwidth in these
applications, a capacitance, CG, may be added in parallel
withRG inordertocanceloutanyparasiticCF capacitance.
Capacitive Loading
The LT1818/LT1819 are optimized for low distortion and
highgainbandwidthapplications. Theamplifierscandrive
a capacitive load of 20pF in a unity-gain configuration and
more with higher gain. When driving a larger capacitive
+
IN
+
R
S
R
G
–
C
LOAD
IN
–
C
G
R
F
C
F
18189 F01
Figure 1
18189f
10
LT1818/LT1819
U
W U U
APPLICATIO S I FOR ATIO
Slew Rate
Example: LT1819IS8 at 85°C, VS = ±5V, RL = 100Ω
The slew rate of the LT1818/LT1819 is proportional to the
differential input voltage. Highest slew rates are therefore
seen in the lowest gain configurations. For example, a 6V
outputstepwithagainof10hasa0.6Vinputstep,whereas
at unity gain there is a 6V input step. The LT1818/LT1819
is tested for slew rate at a gain of –1. Lower slew rates
occur in higher gain configurations, whereas the highest
slew rate (2500V/µs) occurs in a noninverting unity-gain
configuration.
P
DMAX = (10V) • (14mA) + (2.5V)2/100Ω = 202.5mW
TJMAX = 85°C + (2 • 202.5mW) • (150°C/W) = 146°C
Circuit Operation
The LT1818/LT1819 circuit topology is a true voltage
feedback amplifier that has the slewing behavior of a
currentfeedbackamplifier.Theoperationofthecircuitcan
be understood by referring to the Simplified Schematic.
ComplementaryNPNandPNPemitterfollowersbufferthe
inputs and drive an internal resistor. The input voltage
appears across the resistor, generating a current that is
mirrored into the high impedance node.
Power Dissipation
TheLT1818/LT1819combinehighspeedandlargeoutput
drive in small packages. It is possible to exceed the
maximum junction temperature specification (150°C)
under certain conditions. Maximum junction temperature
(TJ) is calculated from the ambient temperature (TA),
powerdissipationperamplifier(PD)andnumberofampli-
fiers (n) as follows:
Complementaryfollowersformanoutputstagethatbuffer
thegainnodefromtheload. Theinputresistor, inputstage
transconductance and the capacitor on the high imped-
ance 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.
TJ = TA + (n • PD • θJA)
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
swingiflessthan1/2thesupplyvoltage).ThereforePDMAX
is:
PDMAX = (V+ – V–) • (ISMAX) + (V+/2)2/RL or
PDMAX = (V+ – V–) • (ISMAX) +
(V+ – VOMAX) • (VOMAX/RL)
18189f
11
LT1818/LT1819
U
TYPICAL APPLICATIO
Single Supply Differential ADC Driver
5V
10µF
18pF
V
IN
+
51.1Ω
1/2 LT1819
5V
–
LTC1744
14 BITS
50Msps
(SET FOR 2V
FULL SCALE)
+
–
A
A
IN
18pF
18pF
536Ω
P-P
IN
536Ω
–
51.1Ω
1/2 LT1819
4.99k
5V
+
4.99k
0.1µF
18189 TA05
Results Obtained with the Circuit of Figure 2 at 5MHz.
FFT Shows 81dB Overall Spurious Free Dynamic Range
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
0
5M
10M
15M
20M
25M
FREQUENCY (Hz)
18189 TA06
18189f
12
LT1818/LT1819
W
W
SI PLIFIED SCHE ATIC
(One Amplifier)
+
V
+IN
R1
OUT
–IN
C
–
V
18189 SS
U
PACKAGE DESCRIPTIO
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)
3.00 ± 0.102
(.118 ± .004)
(NOTE 3)
0.52
(.206)
REF
0.65
(.0256)
BSC
0.42 ± 0.04
(.0165 ± .0015)
TYP
8
7 6
5
RECOMMENDED SOLDER PAD LAYOUT
3.00 ± 0.102
(.118 ± .004)
NOTE 4
4.90 ± 0.15
(1.93 ± .006)
DETAIL “A”
0.254
(.010)
0° – 6° TYP
GAUGE PLANE
1
2
3
4
0.53 ± 0.015
(.021 ± .006)
1.10
(.043)
MAX
0.86
(.034)
REF
DETAIL “A”
0.18
(.077)
SEATING
PLANE
0.22 – 0.38
(.009 – .015)
TYP
0.13 ± 0.076
(.005 ± .003)
0.65
(.0256)
BSC
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
18189f
13
LT1818/LT1819
U
PACKAGE DESCRIPTIO
S5 Package
5-Lead Plastic SOT-23
(Reference LTC DWG # 05-08-1633)
0.62
MAX
0.95
REF
2.80 – 3.10
(NOTE 4)
1.22 REF
1.50 – 1.75
(NOTE 4)
2.60 – 3.00
1.4 MIN
3.85 MAX 2.62 REF
PIN ONE
0.25 – 0.50
TYP 5 PLCS
NOTE 3
RECOMMENDED SOLDER PAD LAYOUT
PER IPC CALCULATOR
0.95 BSC
0.90 – 1.30
0.20 BSC
DATUM ‘A’
0.00 – 0.15
0.90 – 1.45
0.35 – 0.55 REF
1.90 BSC
0.09 – 0.20
(NOTE 3)
NOTE:
S5 SOT-23 0502
1. DIMENSIONS ARE IN MILLIMETERS
2. DRAWING NOT TO SCALE
3. DIMENSIONS ARE INCLUSIVE OF PLATING
ATTENTION: ORIGINAL SOT23-5L PACKAGE.
MOST SOT23-5L PRODUCTS CONVERTED TO THIN SOT23
PACKAGE, DRAWING # 05-08-1635 AFTER APPROXIMATELY
APRIL 2001 SHIP DATE
4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR
5. MOLD FLASH SHALL NOT EXCEED 0.254mm
6. PACKAGE EIAJ REFERENCE IS SC-74A (EIAJ)
18189f
14
LT1818/LT1819
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)
.045 ±.005
NOTE 3
.050 BSC
N
7
5
8
6
N
.245
MIN
.160 ±.005
.150 – .157
(3.810 – 3.988)
NOTE 3
.228 – .244
(5.791 – 6.197)
1
2
3
N/2
N/2
4
.030 ±.005
TYP
RECOMMENDED SOLDER PAD LAYOUT
1
3
2
.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 0502
18189f
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.
15
LT1818/LT1819
U
TYPICAL APPLICATIO
80MHz, 20dB Gain Block
V
IN
+
1/2 LT1819
+
V
1/2 LT1819
–
OUT
–
432Ω
432Ω
200Ω
200Ω
–3dB BANDWIDTH: 80MHz
18189 TA03
20dB Gain Block Frequency Response
Large-Signal Transient Response
25
20
15
10
5
1V/DIV
0
–5
V
= ±5V
= 25°C
S
A
T
–10
100k
10ns/DIV
18189 TA07
1M
10M
100M
FREQUENCY (Hz)
18189 TA04
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
LT1395/LT1396/LT1397
LT1806/LT1807
Single/Dual/Quad 400MHz Current Feedback Amplifiers
Single/Dual 325MHz, 140V/µs Rail-to-Rail I/O Op Amps
Single/Dual 180MHz, 350V/µs Rail-to-Rail I/O Op Amps
Single/Dual/Quad 100MHz, 750V/µs Op Amps
4.6mA Supply Current
Low Noise: 3.5nV/√Hz
LT1809/LT1810
Low Distortion: –90dBc at 5MHz
Low Power: 3.6mA Max at ±5V
Programmable Supply Current
1.9nV/√Hz Noise, 3mA Max
LT1812/LT1813/LT1814
LT1815/LT1816/LT1817
LT6203/LT6204
Single/Dual/Quad 220MHz, 1500V/µs Op Amps
Dual/Quad 100MHz, Rail-to-Rail I/O Op Amps
18189f
LT/TP 0103 2K • PRINTED IN USA
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
16
●
●
(408) 432-1900 FAX: (408) 434-0507 www.linear.com
LINEAR TECHNOLOGY CORPORATION 2002
This datasheet has been download from:
www.datasheetcatalog.com
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