LT1490A_1 [Linear]
Dual/Quad Over-The-Top Micropower Rail-to-Rail Input and Output Op Amps; 双核/四过了顶微功耗轨至轨输入和输出运算放大器
| 型号： | LT1490A_1 |
| 厂家： | 
Linear |
| 描述： | Dual/Quad Over-The-Top Micropower Rail-to-Rail Input and Output Op Amps |
| 文件： | 总16页 (文件大小：340K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LT1490A/LT1491A
Dual/Quad Over-The-Top
Micropower Rail-to-Rail
Input and Output Op Amps
U
FEATURES
DESCRIPTIO
■
®
Low Input Offset Voltage: 500µV Max
The LT 1490A/LT1491A are dual and quad op amps with a
Output Swings to 10mV Max from V–
Rail-to-Rail Input and Output
■
lowinputoffsetvoltageof500µVmax.TheLT1490A/LT1491A
operate on all single and split supplies with a total voltage of
2V to 44V, drawing only 40µA of quiescent current per
amplifier. These amplifiers are reverse supply protected;
they draw virtually no current for reverse supply up to 18V.
The input range of the LT1490A/LT1491A includes both
suppliesandtheoutputswingstobothsupplies. Unlikemost
micropower op amps, the LT1490A/LT1491A can drive
heavy loads; their rail-to-rail outputs drive 20mA. The
LT1490A/LT1491A are unity-gain stable and drive all capaci-
tive loads up to 10,000pF when optional 0.22µF and 150Ω
compensation is used.
■
■
■
Micropower: 50µA/Amplifier Max
Over-The-Top® Input Common Mode Range Extends
44V Above V–, Independent of V+
Specified on 3V, 5V and ±15V Supplies
High Output Current: 20mA
Output Drives 10,000pF with Output Compensation
Reverse Battery Protection to 18V
No Supply Sequencing Problems
High Voltage Gain: 1500V/mV
High CMRR: 98dB
No Phase Reversal
Gain Bandwidth Product: 200kHz
Tiny 3mm × 3mm × 0.8mm DFN Package
■
■
■
■
■
■
■
■
■
■
The LT1490A/LT1491A have a unique input stage that oper-
ates and remains high impedance when above the positive
supply. The inputs take 44V both differential and common
mode even when operating on a 3V supply. Built-in resistors
protect the inputs for faults below the negative supply up to
15V. There is no phase reversal of the output for inputs 15V
U
APPLICATIO S
■
Battery- or Solar-Powered Systems
Portable Instrumentation
Sensor Conditioning
–
–
+
below V or 44V above V , independent of V .
■
Supply Current Sensing
The LT1490A dual op amp is available in the 8-pin MSOP,
PDIP and SO packages. For space limited applications
LT1490A is available in a 3mm × 3mm × 0.8mm, dual fine
pitchleadlesspackage(DFN). ThequadLT1491Aisavailable
in the 14-pin SO, PDIP and 5mm × 3mm × 0.8mm DFN
packages.
■
Battery Monitoring
■
Micropower Active Filters
■
4mA to 20mA Transmitters
, LTC and LT are registered trademarks of Linear Technology Corporation.
Over-The-Top is a registered trademark of Linear Technology Corporation.
Protected by U.S. Patents including 5825228.
U
Battery Monitor
TYPICAL APPLICATIO
R
R
S
A
0.2Ω
2k
Q1
2N3904
CHARGER
VOLTAGE
+
R
A
I
´
1/4 LT1491A
BATT
–
2k
1/4 LT1491A
LOGIC
–
+
R
B
Q2
2N3904
2k
LOGIC HIGH (5V) = CHARGING
LOGIC LOW (0V) = DISCHARGING
+
R
B
´
1/4 LT1491A
2k
–
LOAD
+
+
R
G
1/4 LT1491A
V
OUT
10k
V
BATT
= 12V
–
S1
10k
90.9k
1490A TA01
V
V
=
OUT
OUT
S1 = OPEN, GAIN = 1
S1 = CLOSED, GAIN = 10
R
= R
A
S
B
I
=
AMPS
BATT
(R )(R /R )(GAIN) GAIN
V
= 5V, 0V
S
G
A
sn1490, 14901afbs
1
LT1490A/LT1491A
W W
U W
ABSOLUTE AXI U RATI GS
(Note 1)
Total Supply Voltage (V+ to V–) ............................. 44V
Differential Input Voltage ........................................ 44V
Input Current (Note 9) ....................................... ±12mA
Output Short-Circuit Duration (Note 2)........ Continuous
Operating Temperature Range (Note 3)
Specified Temperature Range (Note 4)
LT1490AC/LT1490AI .......................... –40°C to 85°C
LT1491AC/LT1491AI .......................... –40°C to 85°C
LT1490AH/LT1491AH ...................... –40°C to 125°C
Junction Temperature.......................................... 150°C
Junction Temperature (DD/DHC Package)........... 125°C
Storage Temperature Range ................ –65°C to 150°C
Storage Temperature Range
LT1490AC/LT1491AC ......................... –40°C to 85°C
LT1490AI/LT1491AI ........................... –40°C to 85°C
LT1490AH/LT1491AH ...................... –40°C to 125°C
DD/DHC Package............................. –65°C to 125°C
Lead Temperature (Soldering, 10 sec)................. 300°C
U W
U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
TOP VIEW
TOP VIEW
+
+
1
2
3
4
8
7
6
5
OUT A
–IN A
+IN A
V
OUT A
–IN A
+IN A
1
2
3
4
8
7
6
5
V
+
OUT A
–IN A
+IN A
1
2
3
4
8 V
OUT B
–IN B
+IN B
OUT B
–IN B
+IN B
7 OUT B
6 –IN B
5 +IN B
A
A
A
B
B
–
–
V
B
V
–
V
MS8 PACKAGE
8-LEAD PLASTIC MSOP
N8 PACKAGE
8-LEAD PDIP
S8 PACKAGE
8-LEAD PLASTIC SO
DD PACKAGE
TJMAX = 150°C, θJA = 250°C/ W
8-LEAD (3mm × 3mm) PLASTIC DFN
TJMAX = 150°C, θJA = 130°C/ W (N8)
TJMAX = 150°C, θJA = 190°C/ W (S8)
TJMAX = 125°C, θJA = 160°C/ W (NOTE 2)
UNDERSIDE METAL CONNECTED TO V–
DD
MS8
PART MARKING
S8/N8
PART MARKING
ORDER PART
NUMBER
ORDER PART
ORDER PART
NUMBER
PART MARKING*
NUMBER
LAAH
LTNG
LTPU
LTRK
1490A
1490AI
1490AH
LT1490ACS8
LT1490AIS8
LT1490AHS8
LT1490ACDD
LT1490AIDD
LT1490ACMS8
LT1490AIMS8
LT1490AHMS8
LT1490ACN8
LT1490AIN8
TOP VIEW
ORDER PART
NUMBER
ORDER PART
NUMBER
TOP VIEW
OUT A
–IN A
+IN A
V+
1
2
3
4
5
6
7
8
16 OUT D
15 –IN D
14 +IN D
13 V–
OUT A
–IN A
+IN A
1
2
3
4
5
6
7
14
13
12
11
10
9
OUT D
–IN D
+IN D
LT1491ACDHC
LT1491AIDHC
D
A
LT1491ACS
LT1491AIS
LT1491AHS
A
B
D
C
+
–
V
V
+IN B
–IN B
OUT B
NC
12 +IN C
C
+IN B
–IN B
OUT B
B
+IN C
–IN C
OUT C
11 –IN C
10 OUT C
DHC
PART MARKING*
LT1491ACN
LT1491AIN
8
9
NC
1491A
N PACKAGE
14-LEAD PDIP
S PACKAGE
14-LEAD PLASTIC SO
DHC16 PACKAGE
16-LEAD (5mm × 3mm) PLASTIC DFN
TJMAX = 150°C, θJA = 110°C/ W (N)
TJMAX = 150°C, θJA = 150°C/ W (S)
TJMAX = 125°C, θJA = 160°C/ W (NOTE 2)
UNDERSIDE METAL CONNECTED TO V–
*Temperature grades are identified by a label on the shipping container. Consult LTC Marketing for parts specified with wider operating temperature ranges.
sn1490, 14901afbs
2
LT1490A/LT1491A
ELECTRICAL CHARACTERISTICS
otherwise noted. (Note 4)
The ● denotes specifications which apply over the full operating temperature
range of –40°C ≤ TA ≤ 85°C, otherwise specifications are at TA = 25°C. VS = 3V, 0V; VS = 5V, 0V; VCM = VOUT = half supply unless
LT1490AC/LT1491AC
LT1490AI/LT1491AI
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
Input Offset Voltage (Note 5)
LT1490A N, S Packages
110
500
700
800
µV
µV
µV
OS
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
LT1490A MS8 Package, LT1491A N, S Packages
220
250
1000
1200
1400
µV
µV
µV
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
LT1490A DD, LT1491A DHC
1200
1400
1600
µV
µV
µV
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
Input Offset Voltage Drift (Note 9)
Input Offset Current
–40°C ≤ T ≤ 85°C
●
●
2
2
4
6
µV/°C
µV/°C
A
LT1490A DD, LT1491A DHC, –40°C ≤ T ≤ 85°C
A
I
I
●
●
0.2
0.8
0.8
nA
µA
OS
V
= 44V (Note 6)
CM
Input Bias Current
●
●
1
3
0.3
8
10
nA
µA
nA
B
V
= 44V (Note 6)
CM
V = 0V
S
Input Bias Current Drift
Input Noise Voltage
–40°C ≤ T ≤ 85°C
●
2
1
pA/°C
A
0.1Hz to 10Hz
f = 1kHz
µV
P-P
e
Input Noise Voltage Density
Input Noise Current Density
Input Resistance
50
nV/√Hz
pA/√Hz
n
i
f = 1kHz
0.015
n
R
Differential
6
4
17
11
MΩ
MΩ
IN
Common Mode, V = 0V to 44V
CM
C
Input Capacitance
4.6
pF
V
IN
Input Voltage Range
●
0
44
CMRR
Common Mode Rejection Ratio
(Note 6)
V
V
= 0V to V – 1V
●
●
84
80
98
98
dB
dB
CM
CM
CC
= 0V to 44V
A
Large-Signal Voltage Gain
V = 3V, V = 500mV to 2.5V, R = 10k
200
133
100
1500
V/mV
V/mV
V/mV
VOL
S
O
L
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
V = 5V, V = 500mV to 4.5V, R = 10k
400
250
200
1500
V/mV
V/mV
V/mV
S
O
L
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
V
V
Output Voltage Swing Low
V = 3V, No Load
●
●
3
10
mV
mV
OL
OH
S
V = 3V, I
= 5mA
250
450
S
SINK
V = 5V, No Load
●
●
3
250
330
10
500
500
mV
mV
mV
S
V = 5V, I
= 5mA
= 10mA
S
SINK
SINK
V = 5V, I
S
Output Voltage Swing High
V = 3V, No Load
●
●
2.95
2.55
2.978
2.6
V
V
S
V = 3V, I
= 5mA
S
SOURCE
V = 5V, No Load
●
●
4.95
4.30
4.978
4.6
V
V
S
V = 5V, I
= 10mA
S
SOURCE
I
Short-Circuit Current (Note 2)
V = 3V, Short to GND
10
10
15
30
mA
mA
SC
S
V = 3V, Short to V
S
CC
V = 5V, Short to GND
15
15
25
30
mA
mA
S
V = 5V, Short to V
S
CC
sn1490, 14901afbs
3
LT1490A/LT1491A
ELECTRICAL CHARACTERISTICS
otherwise noted. (Note 4)
The ● denotes specifications which apply over the full operating temperature
range of –40°C ≤ TA ≤ 85°C, otherwise specifications are at TA = 25°C. VS = 3V, 0V; VS = 5V, 0V; VCM = VOUT = half supply unless
LT1490AC/LT1491AC
LT1490AI/LT1491AI
SYMBOL PARAMETER
PSRR Power Supply Rejection Ratio
CONDITIONS
V = 2.5V to 12.5V, V = V = 1V
MIN
TYP
98
2
MAX
UNITS
●
●
●
84
dB
V
S
CM
O
Minimum Operating Supply Voltage
Reverse Supply Voltage
2.5
I = –100µA per Amplifier
S
18
27
40
V
I
Supply Current per Amplifier
(Note 7)
50
55
µA
µA
S
●
GBW
SR
Gain Bandwidth Product
(Note 6)
f = 1kHz
110
100
90
180
kHz
kHz
kHz
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
Slew Rate
(Note 8)
A = –1, R = ∞
0.035
0.031
0.030
0.06
V/µs
V/µs
V/µs
V
L
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
The ● denotes specifications which apply over the full operating temperature range of –40°C ≤ TA ≤ 85°C, otherwise specifications are
at TA = 25°C. VS = ±15V; VCM = 0V, VOUT = 0V unless otherwise noted. (Note 4)
LT1490AC/LT1491AC
LT1490AI/LT1491AI
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
Input Offset Voltage (Note 5)
LT1490A N, S Packages
150
700
950
1100
µV
µV
µV
OS
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
LT1490A MS8 Package, LT1491A N, S Packages
250
285
1200
1350
1500
µV
µV
µV
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
LT1490A DD, LT1491A DHC
1400
1550
1700
µV
µV
µV
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
Input Offset Voltage Drift (Note 9)
–40°C ≤ T ≤ 85°C
●
●
2
2
6
7
µV/°C
µV/°C
A
LT1490A DD, LT1491A DHC, –40°C ≤ T ≤ 85°C
A
I
I
Input Offset Current
●
●
●
0.2
1
0.8
8
nA
nA
OS
Input Bias Current
B
Input Bias Current Drift
Input Noise Voltage
Input Noise Voltage Density
Input Noise Current Density
Input Resistance
–40°C ≤ T ≤ 85°C
5
pA/°C
A
0.1Hz to 10Hz
f = 1kHz
1
µV
P-P
e
50
0.015
nV/√Hz
pA/√Hz
n
i
f = 1kHz
n
R
Differential
6
17
15000
MΩ
MΩ
IN
Common Mode, V = –15V to 14V
CM
C
Input Capacitance
4.6
pF
V
IN
Input Voltage Range
●
●
–15
80
29
CMRR
Common Mode Rejection Ratio
Large-Signal Voltage Gain
V
= –15V to 29V
98
dB
CM
A
V = ±14V, R = 10k
100
75
50
250
V/mV
V/mV
V/mV
VOL
O
L
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
V
Output Voltage Swing
No Load
●
●
± 14.9
± 14.5
± 14.5
±14.978
± 14.750
± 14.670
V
V
V
O
I
I
= ± 5mA
OUT
OUT
= ± 10mA
sn1490, 14901afbs
4
LT1490A/LT1491A
ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the full operating temperature
range of –40°C ≤ TA ≤ 85°C, otherwise specifications are at TA = 25°C. VS = ±15V; VCM = 0V, VOUT = 0V unless otherwise noted. (Note 4)
LT1490AC/LT1491AC
LT1490AI/LT1491AI
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
I
Short-Circuit Current (Note 2)
Short to GND
± 20
± 15
± 10
± 25
mA
mA
mA
SC
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
PSRR
Power Supply Rejection Ratio
Supply Current per Amplifier
V = ±1.25V to ±22V
S
●
88
98
50
dB
I
70
85
µA
µA
S
●
GBW
SR
Gain Bandwidth Product
Slew Rate
f = 1kHz
125
110
100
200
kHz
kHz
kHz
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
A = –1, R = ∞, V = ±10V,
0.0375
0.07
V/µs
V
L
O
Measure at V = ±5V
O
0°C ≤ T ≤ 70°C
●
●
0.0330
0.0300
V/µs
V/µs
A
–40°C ≤ T ≤ 85°C
A
The ● denotes specifications which apply over the full operating temperature range of –40°C ≤ TA ≤ 125°C. VS = 3V, 0V; VS = 5V, 0V;
VCM = VOUT = half supply unless otherwise noted. (Note 4)
LT1490AH/LT1491AH
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
OS
Input Offset Voltage (Note 5)
LT1490AHS8
110
500
2500
µV
µV
●
LT1490AHMS8, LT1491AHS
220
3
1000
3000
µV
µV
●
●
Input Offset Voltage Drift (Note 9)
Input Offset Current
6
µV/°C
I
I
●
●
2
1.5
nA
µA
OS
V
V
= 44V (Note 6)
= 44V (Note 6)
CM
Input Bias Current
●
●
20
15
nA
µA
B
CM
Input Voltage Range
●
0.3
44
V
CMRR
Common Mode Rejection Ratio
(Note 6)
V
CM
V
CM
= 0.3V to V –1V
= 0.3V to 44V
●
●
60
74
dB
dB
CC
A
V
V
Large-Signal Voltage Gain
Output Voltage Swing Low
Output Voltage Swing High
V = 3V, V = 500mV to 2.5V, R = 10k
200
25
1500
1500
V/mV
V/MV
VOL
S
O
L
●
V = 5V, V = 500mV to 4.5V, R = 10k
400
50
V/mV
V/mV
S
O
L
●
V = 3V, No Load
●
●
15
450
mV
mV
OL
S
V = 3V, I
= 2.5mA
S
SINK
V = 5V, No Load
●
●
15
500
mV
mV
S
V = 5V, I
= 2.5mA
S
SINK
V = 3V, No Load
●
●
2.925
2.350
V
V
OH
S
V = 3V, I
= 5mA
S
SOURCE
V = 5V, No Load
●
●
4.925
4.100
V
V
S
V = 5V, I
= 10mA
S
SOURCE
PSRR
Power Supply Rejection Ratio
Minimum Operating Supply Voltage
Reverse Supply Voltage
V = 2.5V to 12.5V, V = V = 1V
●
●
●
80
dB
V
S
CM
O
2.5
I = –100µA per Amplifier
S
18
V
sn1490, 14901afbs
5
LT1490A/LT1491A
ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the full operating temperature
range of –40°C ≤ TA ≤ 125°C. VS = ± 15V, VCM = 0V, VOUT = 0V unless otherwise noted. (Note 4)
LT1490AH/LT1491AH
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
I
Supply Current per Amplifier (Note 7)
Gain Bandwidth Product (Note 6)
Slew Rate (Note 8)
40
50
70
µA
µA
S
●
●
●
GBW
SR
f = 1kHz
110
60
180
kHz
kHz
A = –1, R = ∞
V
0.035
0.015
0.06
V/µs
V/µs
L
V
Input Offset Voltage (Note 5)
LT1490AHS8
150
250
3
700
2700
µV
µV
OS
●
LT1490AHMS8, LT1491AHS
1200
3200
µV
µV
●
●
●
●
●
●
Input Offset Voltage Drift (Note 9)
Input Offset Current
7
2
µV/°C
nA
I
I
OS
Input Bias Current
20
29
nA
B
Input Voltage Range
–14.7
72
V
CMRR
Common Mode Rejection Ratio
Large-Signal Voltage Gain
V
= –14.7V to 29V
dB
CM
A
V = ±14V, R = 10k
100
4
250
V/mV
V/mV
VOL
O
L
●
V
Output Voltage Swing
No Load
●
●
±14.8
±14.3
mV
mV
O
I
= ±2.5mA
OUT
PSRR
Power Supply Rejection Ratio
Supply Current per Amplifier
V = ±1.25V to ±22V
●
●
●
●
84
dB
S
I
50
70
95
µA
µA
S
GBW
SR
Gain Bandwidth Product
Slew Rate
f = 1kHz
125
75
200
0.07
kHz
kHz
A = –1, R = ∞
0.0375
0.02
V/µs
V/µs
V
L
Note 1: Absolute Maximum Ratings are those values beyond which the life
of the device may be impaired.
Note 2: A heat sink may be required to keep the junction temperature
LT1490AI/LT1491AI are guaranteed to meet specified performance from
–40°C to 85°C. The LT1490AH/LT1491AH are guaranteed to meet
specified performance from –40°C to 125°C.
below absolute maximum. This depends on the power supply voltage and
Note 5: ESD (Electrostatic Discharge) sensitive device. Extensive use of
ESD protection devices are used internal to the LT1490A/LT1491A.
However, high electrostatic discharge can damage or degrade the device.
Use proper ESD handling precautions.
how many amplifiers are shorted. The θ specified for the DD and DHC
JA
package is with minimal PCB heat spreading metal. Using expanded metal
area on all layers of a board reduces this value.
Note 3: The LT1490AC/LT1491AC and LT1490AI/LT1491AI are guaranteed
functional over the operating temperature range of –40°C to 85°C. The
LT1490AH/LT1491AH are guaranteed functional over the operating
temperature range of –40°C to 125°C.
Note 6: V = 5V limits are guaranteed by correlation to V = 3V and
S S
V = ±15V tests.
S
Note 7: V = 3V limits are guaranteed by correlation to V = 5V and
S
S
V = ±15V tests.
S
Note 4: The LT1490AC/LT1491AC are guaranteed to meet specified
performance from 0°C to 70°C. The LT1490AC/LT1491AC are designed,
characterized and expected to meet specified performance from –40°C to
85°C but are not tested or QA sampled at these temperatures. The
Note 8: Guaranteed by correlation to slew rate at V = ±15V and GBW
S
at V = 3V and V = ±15V tests.
S
S
Note 9: This parameter is not 100% tested.
sn1490, 14901afbs
6
LT1490A/LT1491A
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Input Bias Current
vs Common Mode Voltage
Supply Current vs Supply Voltage
Minimum Supply Voltage
80
70
60
50
40
30
20
10
0
5000
3000
1000
400
300
V
= 5V, 0V
S
T
= 125°C
A
T
200
100
= 25°C
A
T
= –55°C
T
= –55°C
A
A
T
= 25°C
A
30
20
0
T
= 25°C
A
T
A
= –55°C
–100
T
= 125°C
A
10
–200
–300
0
T
= 125°C
A
–10
–400
0
5
10 15 20 25 30 35 40 45
TOTAL SUPPLY VOLTAGE (V)
–0.4
0 4.0 4.4 4.8 5.2 5.6
COMMON MODE VOLTAGE (V)
44
0
1
2
3
4
5
TOTAL SUPPLY VOLTAGE (V)
1490A G01
1490A G03
1490A G02
Output Saturation Voltage
vs Load Current (Output High)
Output Saturation Voltage
vs Input Overdrive
Output Saturation Voltage
vs Load Current (Output Low)
1
100m
10m
1m
1
100
90
80
70
60
50
40
30
20
10
0
V
= 5V, 0V
V
= 5V, 0V
V = 5V, 0V
S
S
S
NO LOAD
T
= 125°C
A
T
= 125°C
A
T
= 25°C
A
100m
T
= 25°C
A
T
= –55°C
A
OUTPUT HIGH
OUTPUT LOW
T
= –55°C
A
10m
1µ
10µ
100µ
1m
10m
100m
0
10
30
INPUT OVERDRIVE (mV)
40
50
0.1µ
1µ
10µ 100µ 1m
10m 100m
20
SINKING LOAD CURRENT (A)
SOURCING LOAD CURRENT (A)
1490A G04
1490A G06
1490A G05
Noise Voltage Density
vs Frequency
0.1Hz to 10Hz Noise Voltage
Input Noise Current vs Frequency
120
100
80
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0
V
S
= ±2.5V
60
40
20
0
1
2
3
4
5
6
7
8
9
10
1
10
100
1k
1
10
100
1k
TIME (SEC)
FREQUENCY (Hz)
FREQUENCY (Hz)
1490A G09
1490A G08
1490A G07
sn1490, 14901afbs
7
LT1490A/LT1491A
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Gain and Phase Shift
vs Frequency
Gain Bandwidth Product
vs Temperature
Slew Rate vs Temperature
0.12
0.10
0.08
0.06
0.04
260
240
220
200
180
160
140
120
100
70
60
50
40
100
80
V
= ±2.5V
f = 1kHz
S
RISING, V = ±15V
S
60
PHASE
40
30
20
20
0
V
S
= ±15V
RISING, V = ±1.5V
S
FALLING, V = ±15V
GAIN
V
= ±1.5V
S
S
10
0
–20
–40
–60
–80
–100
FALLING, V = ±1.5V
S
–10
–20
–30
50
75 100 125
–50
0
25
50
75 100 125
–50
0
25
–25
–25
1
10
100
1000
TEMPERATURE (°C)
TEMPERATURE (°C)
FREQUENCY (kHz)
1490A G10
1490A G11
1490A G12
Gain Bandwidth Product and
Phase Margin vs Supply Voltage
CMRR vs Frequency
PSRR vs Frequency
250
240
230
220
210
200
190
180
170
160
150
60
50
40
30
20
10
120
80
70
V
= ±2.5V
S
PHASE MARGIN
100
80
60
40
20
60
50
V
= ±15V
POSITIVE SUPPLY
S
40
V
= ±1.5V
S
30
GAIN BANDWIDTH
20
NEGATIVE SUPPLY
10
0
R
= 10k
L
–10
–20
f = 1kHz
0
5
10 15 20 25 30 35 40 45
TOTAL SUPPLY VOLTAGE (V)
1
10
100
1
10
FREQUENCY (kHz)
100
FREQUENCY (kHz)
1490A G14
1490A G15
1490A G13
Gain Bandwidth Product and
Phase Margin vs Load Resistance
Channel Separation vs Frequency
Output Impedance vs Frequency
350
300
250
200
150
100
50
80
10k
1k
130
120
110
100
90
V
= ± 2.5V
V
A
= ± 2.5V
V
= ±15V
S
S
V
F
S
= –1
R = R = 100k 70
G
f = 1kHz
A
A
= 100
= 10
V
V
PHASE MARGIN
60
50
40
30
20
100
10
80
GAIN BANDWIDTH
70
A
= 1
V
60
1
50
0.1
40
1
10
LOAD RESISTANCE (kΩ)
100
0.1
1
10
100
0.1
1
10
100
FREQUENCY (kHz)
FREQUENCY (kHz)
1490A G16
1490A G17
1490A G18
sn1490, 14901afbs
8
LT1490A/LT1491A
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Undistorted Output Swing
vs Frequency
Settling Time to 0.1%
vs Output Step
Capacitive Load Handling,
Overshoot vs Capacitive Load
10
8
100
90
80
70
60
50
40
30
20
10
0
35
30
25
20
15
10
5
V
= ±15V
S
V = 5V, 0V
S
DISTORTION ≤1%
V
= ±15V
S
I
= 170µA
SOURCE
A
= –1
V
6
A
= 1
V
4
2
0
A
= 10
V
–2
–4
–6
–8
–10
A
V
= 1
A
= 2
A
= 5
V
V
V
= 5V, 0V
A = –1
V
S
A
= 1
V
0
0
80
120 140
160
10
100
1000
10000
20 40 60
100
0.1
1
10
100
SETTLING TIME (µs)
CAPACITIVE LOAD (pF)
FREQUENCY (kHz)
1490A G21
1490A G19
1490A F20
Total Harmonic Distortion + Noise
vs Frequency
Total Harmonic Distortion + Noise
vs Load Resistance
Total Harmonic Distortion + Noise
vs Output Voltage
10
1
10
1
10
1
V
V
V
= 3V, 0V
= 2V
CM
= 50k
V
A
V
= 3V TOTAL
= 1
R
V
= 10k
CM
f = 1kHz
S
OUT
S
V
L
= HALF SUPPLY
P-P
= 1.2V
= 2V AT 1kHz
IN
P-P
R
L
V
V
= ±1.5V
= ±1V
S
IN
A
V
= 1
= ±1.5V
V
S
A
S
= –1
V
V
= ±1.5V
0.1
0.1
0.1
V
V
= 3V, 0V
IN
S
= 0.5V TO 2.5V
A
S
= –1
0.01
0.01
0.01
0.001
V
A
= –1
V
V
= 3V, 0V
A
= 1
V
V
V
= 3V, 0V
IN
S
A
= 1
V
V
= 3V, 0V
S
= 0.2V TO 2.2V
0.001
0.001
0
1
2
3
0.01
0.1
1
10
0.1
1
10
100
OUTPUT VOLTAGE (V
)
P-P
FREQUENCY (kHz)
LOAD RESISTANCE TO GROUND (kΩ)
1490A G24
1490A G22
1490A G23
Open-Loop Gain
Large-Signal Response
Small-Signal Response
VS = ±15V
RL = 2k
R
= 10k
L
RL = 50k
1490A G27
1490A G25
1490A G26
VS = ±15V
AV = –1
V
S = ±15V
–10V
0V
10V
AV = 1
OUTPUT VOLTAGE (5V/DIV)
sn1490, 14901afbs
9
LT1490A/LT1491A
W U U
U
APPLICATIO S I FOR ATIO
Supply Voltage
operating above V+. The LT1490A/LT1491A will operate
with their inputs 44V above V– regardless of V+.
The positive supply pin of the LT1490A/LT1491A should
be bypassed with a small capacitor (about 0.01µF) within
an inch of the pin. When driving heavy loads an additional
4.7µF electrolytic capacitor should be used. When using
split supplies, the same is true for the negative supply pin.
The inputs are protected against excursions as much as
15V below V– by an internal 1k resistor in series with
each input and a diode from the input to the negative
supply. There is no output phase reversal for inputs up to
15VbelowV–. Therearenoclampingdiodesbetweenthe
inputsandthemaximumdifferentialinputvoltageis44V.
The LT1490A/LT1491A are protected against reverse bat-
tery voltages up to 18V. In the event a reverse battery
condition occurs, the supply current is less than 1nA.
TheLT1490A/LT1491AcanbeshutdownbyremovingV+.
Inthisconditiontheinputbiascurrentistypicallylessthan
0.5nA, even if the inputs are 44V above the negative
supply.
Output
The output voltage swing of the LT1490A/LT1491A is
affected by input overdrive as shown in the typical perfor-
mance curves.
The output of the LT1490A/LT1491A can be pulled up to
18V beyond V+ with less than 1nA of leakage current,
provided that V+ is less than 0.5V.
When operating the LT1490A/LT1491A on total supplies
of 20V or more, the supply must not rise to its final voltage
in less than 1µs. This is especially true if low ESR bypass
capacitors are used. A series RLC circuit is formed from
the supply lead inductance and the bypass capacitor. A
resistance of 7.5Ω in the supply or in the bypass capacitor
will dampen the tuned circuit enough to limit the rise time.
The normally reverse-biased substrate diode from the
outputtoV– willcauseunlimitedcurrentstoflowwhenthe
output is forced below V–. If the current is transient and
limited to 100mA, no damage will occur.
The LT1490A/LT1491A are internally compensated to
drive at least 200pF of capacitance under any output
loading conditions. A 0.22µF capacitor in series with a
150Ω resistor between the output and ground will com-
pensate these amplifiers for larger capacitive loads, up to
10,000pF, at all output currents.
Inputs
The LT1490A/LT1491A have two input stages, NPN and
PNP (see the Simplified Schematic), resulting in three
distinct operating regions as shown in the Input Bias
Current vs Common Mode typical performance curve.
For input voltages about 0.8V or more below V+, the PNP
input stage is active and the input bias current is typically
–1nA. When the input voltage is about 0.5V or less from
V+, the NPN input stage is operating and the input bias
current is typically 25nA. Increases in temperature will
cause the voltage at which operation switches from the
PNPstagetotheNPNstagetomovetowardsV+. Theinput
offset voltage of the NPN stage is untrimmed and is
typically 600µV.
Distortion
Therearetwomaincontributorsofdistortioninopamps:
output crossover distortion as the output transitions
from sourcing to sinking current and distortion caused
bynonlinearcommonmoderejection.Ofcourse,iftheop
amp is operating inverting there is no common mode
induced distortion. When the LT1490A/LT1491A switch
between input stages there is significant nonlinearity in
the CMRR. Lower load resistance increases the output
crossover distortion, but has no effect on the input stage
transition distortion. For lowest distortion the LT1490A/
LT1491A should be operated single supply, with the
output always sourcing current and with the input volt-
age swing between ground and (V+ – 0.8V). See the
Typical Performance Characteristics curves.
A Schottky diode in the collector of each NPN transistor of
the NPN input stage allows the LT1490A/LT1491A to op-
erate with either or both of their inputs above V+. At about
0.3V above V+ the NPN input transistor is fully saturated
and the input bias current is typically 3µA at room tem-
perature. The input offset voltage is typically 700µV when
sn1490, 14901afbs
10
LT1490A/LT1491A
W U U
APPLICATIO S I FOR ATIO
U
Gain
in single supply applications where the load is returned to
ground. The typical performance photo of Open-Loop
Gain for various loads shows the details.
The open-loop gain is almost independent of load when
theoutputissourcingcurrent.Thisoptimizesperformance
U
TYPICAL APPLICATIO S
Square Wave Oscillator
Optional Output Compensation for
Capacitive Loads Greater Than 200pF
59k
5V
100k
100k
+
V
IN
+
1/2 LT1490A
1/2 LT1490A
V
OUT
C
L
≤ 10,000pF
–
–
R
50k
C
1490A TA02
0.22µF
150Ω
0.1µF
1
2RC
f =
1490A TA04
V
= 5V WITH 5V SUPPLY
OUT
= 200µA
P-P
I
S
AT V = 5V, R = 50k, C = 1nF
S
OUTPUT IS 5kHz SLEW LIMITED TRIANGLE WAVE
W
W
SI PLIFIED SCHE ATIC
+
V
Q2
Q1
Q3
Q22
D1
D2
D3
R1
30k
R2
1k
Q19
Q4
–IN
+IN
Q17
Q18
Q20
OUT
Q7
Q8
Q11 Q12
R3
1k
+
Q16
2µA
Q15
Q9
Q10
Q13
Q14
Q21
R4
40k
R5
40k
Q5
Q6
D4
D5
–
V
ONE AMPLIFIER
1490A SS
sn1490, 14901afbs
11
LT1490A/LT1491A
U
PACKAGE DESCRIPTIO
DD Package
8-Lead Plastic DFN (3mm × 3mm)
(Reference LTC DWG # 05-08-1698)
R = 0.115
0.38 ± 0.10
TYP
5
8
0.675 ±0.05
3.5 ±0.05
2.15 ±0.05 (2 SIDES)
1.65 ±0.05
3.00 ±0.10
(4 SIDES)
1.65 ± 0.10
(2 SIDES)
PIN 1
TOP MARK
(NOTE 6)
PACKAGE
OUTLINE
(DD8) DFN 1203
4
1
0.25 ± 0.05
0.75 ±0.05
0.200 REF
0.25 ± 0.05
0.50 BSC
0.50
BSC
2.38 ±0.05
(2 SIDES)
2.38 ±0.10
(2 SIDES)
0.00 – 0.05
BOTTOM VIEW—EXPOSED PAD
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
NOTE:
1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (WEED-1)
2. DRAWING NOT TO SCALE
3. ALL DIMENSIONS ARE IN MILLIMETERS
4. 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
5. EXPOSED PAD SHALL BE SOLDER PLATED
6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION
ON TOP AND BOTTOM OF PACKAGE
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
sn1490, 14901afbs
12
LT1490A/LT1491A
U
PACKAGE DESCRIPTIO
N8 Package
8-Lead PDIP (Narrow .300 Inch)
(Reference LTC DWG # 05-08-1510)
.400*
(10.160)
MAX
8
7
6
5
4
.255 ± .015*
(6.477 ± 0.381)
1
2
3
.130 ± .005
.300 – .325
.045 – .065
(3.302 ± 0.127)
(1.143 – 1.651)
(7.620 – 8.255)
.065
(1.651)
TYP
.008 – .015
(0.203 – 0.381)
.120
.020
(0.508)
MIN
(3.048)
MIN
+.035
.325
–.015
.018 ± .003
(0.457 ± 0.076)
.100
(2.54)
BSC
+0.889
8.255
(
)
N8 1002
–0.381
NOTE:
INCHES
1. DIMENSIONS ARE
MILLIMETERS
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm)
S8 Package
8-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610)
.189 – .197
(4.801 – 5.004)
.045 ±.005
NOTE 3
.050 BSC
7
5
8
6
.245
MIN
.160 ±.005
.150 – .157
(3.810 – 3.988)
NOTE 3
.228 – .244
(5.791 – 6.197)
.030 ±.005
TYP
1
3
4
2
RECOMMENDED SOLDER PAD LAYOUT
.010 – .020
(0.254 – 0.508)
× 45°
.053 – .069
(1.346 – 1.752)
.004 – .010
(0.101 – 0.254)
.008 – .010
(0.203 – 0.254)
0°– 8° TYP
.016 – .050
(0.406 – 1.270)
.050
(1.270)
BSC
.014 – .019
(0.355 – 0.483)
TYP
NOTE:
INCHES
1. DIMENSIONS IN
(MILLIMETERS)
2. DRAWING NOT TO SCALE
3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
SO8 0303
sn1490, 14901afbs
13
LT1490A/LT1491A
U
PACKAGE DESCRIPTIO
N Package
14-Lead PDIP (Narrow .300 Inch)
(Reference LTC DWG # 05-08-1510)
.770*
(19.558)
MAX
14
13
12
11
10
9
8
7
.255 ± .015*
(6.477 ± 0.381)
1
2
3
5
6
4
.300 – .325
(7.620 – 8.255)
.045 – .065
(1.143 – 1.651)
.130 ± .005
(3.302 ± 0.127)
.020
(0.508)
MIN
.065
(1.651)
TYP
.008 – .015
(0.203 – 0.381)
+.035
.325
.005
(0.127)
MIN
–.015
.120
(3.048)
MIN
.018 ± .003
.100
(2.54)
BSC
+0.889
8.255
(0.457 ± 0.076)
(
)
–0.381
N14 1103
NOTE:
INCHES
MILLIMETERS
1. DIMENSIONS ARE
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm)
S Package
14-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610)
.337 – .344
.045 ±.005
(8.560 – 8.738)
.050 BSC
NOTE 3
14
N
13
12
11
10
9
8
N
1
.245
MIN
.160 ±.005
.150 – .157
.228 – .244
(5.791 – 6.197)
(3.810 – 3.988)
NOTE 3
2
3
N/2
N/2
7
.030 ±.005
TYP
RECOMMENDED SOLDER PAD LAYOUT
1
2
3
4
5
6
.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
.050
(1.270)
BSC
.014 – .019
(0.355 – 0.483)
TYP
.016 – .050
(0.406 – 1.270)
S14 0502
NOTE:
INCHES
(MILLIMETERS)
2. DRAWING NOT TO SCALE
1. DIMENSIONS IN
3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
sn1490, 14901afbs
14
LT1490A/LT1491A
U
PACKAGE DESCRIPTIO
DHC Package
16-Lead Plastic DFN (5mm × 3mm)
(Reference LTC DWG # 05-08-1706)
0.65 ±0.05
3.50 ±0.05
1.65 ±0.05
2.20 ±0.05 (2 SIDES)
PACKAGE
OUTLINE
0.25 ± 0.05
0.50 BSC
4.40 ±0.05
(2 SIDES)
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
R = 0.115
0.40 ± 0.10
5.00 ±0.10
(2 SIDES)
TYP
16
9
R = 0.20
TYP
3.00 ±0.10 1.65 ± 0.10
(2 SIDES)
(2 SIDES)
PIN 1
TOP MARK
(SEE NOTE 6)
PIN 1
NOTCH
(DHC16) DFN 1103
8
1
0.25 ± 0.05
0.50 BSC
0.75 ±0.05
0.200 REF
4.40 ±0.10
(2 SIDES)
0.00 – 0.05
BOTTOM VIEW—EXPOSED PAD
NOTE:
1. DRAWING PROPOSED TO BE MADE VARIATION OF VERSION (WJED-1) IN JEDEC
PACKAGE OUTLINE MO-229
2. DRAWING NOT TO SCALE
3. ALL DIMENSIONS ARE IN MILLIMETERS
4. 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
5. EXPOSED PAD SHALL BE SOLDER PLATED
6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE
TOP AND BOTTOM OF PACKAGE
sn1490, 14901afbs
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
LT1490A/LT1491A
U
TYPICAL APPLICATIO
Ring-Tone Generator
60V
R16
100k
R2
47k
Q1
R3
R5
IRF628
R6
10k
Q3
2N3904
10k
100k
C3
C2
0.047µF
0.47µF
R17
Z1
15V
100k
5
R9
300k
R11
620Ω
+
10k
10
3
2
7
D1
1N4148
1/4 LT1491A
+
+
1
6
8
R1
33k
1/4 LT1491A
1/4 LT1491A
–
4
13
12
R7
16k
–
9
C4
0.068µF
–
–
14
R18
100Ω
1/4 LT1491A
+
C7
47µF
R26
2k
R24
420
R23
4.7k
R12
10k
R14
10k
R4
1.6M
R8
620k
C1
1µF
11
R10
620k
SMOOTHING FILTER
OPTO1*
R25
4.7k
R13
130k
R15
47k
C5
0.01µF
CADENCE OSCILLATOR
20Hz OSCILLATOR
Q5
2N3904
UP TO
LOAD TEN
PHONES
Z2
15V
R19
620Ω
Q4
2N3906
Q2
IRF9620
R21
150Ω
*LED OF OPTO1 ILLUMINATES WHEN THE PHONE IS OFF THE HOOK
SEE DESIGN NOTE DN134 FOR A DISCUSSION OF THE CIRCUIT
C6
0.033µF
POWER AMPLIFIER
R20
100k
–180V
1490A TA03
RELATED PARTS
PART NUMBER
LT1366/LT1367
LT1636
DESCRIPTION
COMMENTS
475µV V
Dual/Quad Precision, Rail-to-Rail Input and Output Op Amps
, 500V/mV A
, 400kHz GBW
OS(MAX)
VOL(MIN)
Single Over-The-Top Micropower Rail-to-Rail Input and Output
Op Amp
55µA Supply Current, V
Independent of V , MSOP Package, Shutdown Function
Extends 44V above V ,
CM EE
CC
LT1638/LT1639
LT1782
Dual/Quad 1.2MHz Over-The-Top Micropower, Rail-to-Rail
Input and Output Op Amps
0.4V/µs Slew Rate, 230µA Supply Current per Amplifier
Micropower, Over-The-Top, SOT-23, Rail-to-Rail
Input and Output Op Amp
SOT-23, 800µV V , I =55µA (Max),
OS(MAX) S
Gain-Bandwidth = 200kHz, Shutdown Pin
LT1783
1.2MHz, Over-The-Top, Micropower, Rail-to-Rail
Input and Output Op Amp
SOT-23, 800µV V , I =300µA (Max),
OS(MAX)
S
Gain-Bandwidth = 1.2MHz, Shutdown Pin
sn1490, 14901afbs
LT/TP 0105 REV B • 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 2000
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