LT2178AIS8#PBF [Linear]
LT2178 - 17µA Max, Dual and Quad, Single Supply, Precision Op Amps; Package: SO; Pins: 8; Temperature Range: -40°C to 85°C;
| 型号： | LT2178AIS8#PBF |
| 厂家： | 
Linear |
| 描述： | LT2178 - 17µA Max, Dual and Quad, Single Supply, Precision Op Amps; Package: SO; Pins: 8; Temperature Range: -40°C to 85°C 放大器 光电二极管 |
| 文件： | 总12页 (文件大小：209K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LT2178/LT2179
17µA Max, Dual and Quad,
Single Supply, Precision Op Amps
FEATURES
DESCRIPTION
The LT®2178 is a micropower dual op amp in a surface
mount standard 8-pin configuration, the LT2179 is a
micropower quad op amp offered in a surface mount
14-pin package. Both devices are optimized for single
supply operation at 5V. Specifications are also provided
at 15V supply.
n
SO Package with Standard Pinout
n
Supply Current per Amplifier: 17μA Max
n
Offset Voltage: 70μV Max
n
Offset Current: 250pA Max
n
Input Bias Current: 5nA Max
n
Voltage Noise: 0.9μV , 0.1Hz to 10Hz
P-P
P-P
n
Current Noise: 1.5pA , 0.1Hz to 10Hz
The extremely low supply current is combined with true
precision specifications: offset voltage is 30μV and offset
currentis50pA. Bothoffsetparametershavelowdriftwith
n
n
n
n
Offset Voltage Drift: 0.5μV/°C
Gain Bandwidth Product: 85kHz
Slew Rate: 0.04V/μs
temperature. The 1.5pA current noise and picoampere
P-P
Single Supply Operation
offset current permit the use the megohm level source
Input Voltage Range Includes Ground
Output Swings to Ground while Sinking Current
No Pull-Down Resistors Needed
Output Sources and Sinks 5mA Load Current
resistors without introducing serious errors. Voltage
noise, at 0.9μV , is remarkably low considering the low
P-P
supply current.
n
The LT2178/LT2179 can be operated from a single supply
(aslowasonelithium-cellortwoNiCdbatteries).Theinput
rangegoesbelowground.Theall-NPNoutputstageswings
to within a few millivolts of ground while sinking current.
No power consuming pull down resistors are needed.
APPLICATIONS
n
Battery- or Solar-Powered Systems
Portable Instrumentation
Remote Sensor Amplifier
Satellite Circuitry
For surface mount applications where three times higher
supply current is acceptable, the micropower LT1077
single, LT2078 dual and LT2079 quad are recommended.
The LT1077/LT2078/LT2079 have significantly higher
bandwidth,slewrate,lowervoltagenoiseandbetteroutput
drive capability. For applications requiring DIP packages
refer to the LT1178/LT1179.
n
Micropower Sample-and-Hold
n
Thermocouple Amplifier
Micropower Filters
n
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
Self-Buffered, Dual Output, Micropower Reference
Supply Current vs Temperature
20
TOTAL BATTERY CURRENT = 28mA
OUTPUT ACCURACY = p0.4% MAX
–
2
TEMPERATURE COEFFICIENT = 20ppm/°C
+
LOAD REGULATION = 25ppm/mA, I ≤ 5mA, V ≥ 5V
18
16
14
12
10
L
1.2365V
OUTPUT
1
1/2 LT2178
LINE REGULATION = 10ppm/V
* 0.1% FILM RESISTORS
V
= p15V
S
+
3
4V TO 9V
4
+
8
5
2.470V
OUTPUT
7
250k
V
= 5V, 0V
= p1.5V
50
S
S
1/2 LT2178
–
6
2M
0.1μF
0.1μF
V
LT1004-1.2
1M*
1M*
21789 TA01
–50
–25
25
75
100
0
TEMPERATURE (°C)
21789 TA02
21789fc
1
LT2178/LT2179
ABSOLUTE MAXIMUM RATINGS
Specified Temperature Range
Supply Voltage........................................................ 22V
Differential Input Voltage......................................... 30V
Input Voltage................ Equal to Positive Supply Voltage
.............................5V Below Negative Supply Voltage
Output Short-Circuit Duration .......................... Indefinite
Commercial.............................................. 0°C to 70°C
Industrial ............................................. –40°C to 85°C
Storage Temperature Range................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec) .................. 300°C
PIN CONFIGURATION
TOP VIEW
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
TOP VIEW
–
+
+–A
D
C
+
OUT A
–IN A
+IN A
1
2
3
4
8
7
6
5
V
+–A
OUT B
–IN B
+IN B
+
–
V
V
–
+
+
+
–
B
+IN B
–IN B
+IN C
–IN C
OUT C
–
–B
V
S8 PACKAGE
8-LEAD PLASTIC SO
OUT B
8
S PACKAGE
14-LEAD PLASTIC SO
T
= 150°C, θ = 190°C/W
JA
JMAX
T
= 150°C, θ = 150°C/W
JA
JMAX
ORDER INFORMATION
LEAD FREE FINISH
LT2178ACS8#PBF
LT2178AIS8#PBF
LT2178CS8#PBF
LT2178IS8#PBF
LT2179ACS#PBF
LT2179CS#PBF
LT2179IS#PBF
LEAD BASED FINISH
LT2178ACS8
TAPE AND REEL
LT2178ACS8#TRPBF
LT2178AIS8#TRPBF
LT2178CS8#TRPBF
LT2178IS8#TRPBF
LT2179ACS#TRPBF
LT2179CS#TRPBF
LT2179IS#TRPBF
TAPE AND REEL
LT2178ACS8#TR
LT2178AIS8#TR
LT2178CS8#TR
PART MARKING
2178A
PACKAGE DESCRIPTION
8-Lead Plastic SO
8-Lead Plastic SO
8-Lead Plastic SO
8-Lead Plastic SO
14-Lead Plastic SO
14-Lead Plastic SO
14-Lead Plastic SO
PACKAGE DESCRIPTION
8-Lead Plastic SO
8-Lead Plastic SO
8-Lead Plastic SO
8-Lead Plastic SO
14-Lead Plastic SO
14-Lead Plastic SO
14-Lead Plastic SO
TEMPERATURE RANGE
0°C to 70°C
2178AI
2178
–40°C to 85°C
0°C to 70°C
2178I
–40°C to 85°C
0°C to 70°C
2179A
2179
0°C to 70°C
2179I
–40°C to 85°C
TEMPERATURE RANGE
0°C to 70°C
PART MARKING
2178A
LT2178AIS8
2178AI
2178
–40°C to 85°C
0°C to 70°C
LT2178CS8
LT2178IS8
LT2178IS8#TR
2178I
–40°C to 85°C
0°C to 70°C
LT2179ACS
LT2179ACS#TR
LT2179CS#TR
2179A
LT2179CS
2179
0°C to 70°C
LT2179IS
LT2179IS#TR
2179I
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
21789fc
2
LT2178/LT2179
ELECTRICAL CHARACTERISTICS VS = 5V, 0V, VCM = 0.1V, VO = 1.4V, TA = 25°C, unless otherwise noted.
LT2178AC/LT2178AI
LT2179AC
LT2178C/LT2178I
LT2179C/LT2179I
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX UNITS
V
Input Offset Voltage
LT2178
LT2179
30
35
70
100
40
40
120
150
ꢀV
ꢀV
OS
Long Term Input Offset
Voltage Stability
0.5
0.6
ꢀV/Mo
ΔV
OS
ΔTime
I
I
Input Offset Current
Input Bias Current
0.05
3
0.25
5
0.05
3
0.35
6
nA
nA
OS
B
e
Input Noise Voltage
Input Noise Voltage Density
0.1Hz to 10Hz (Note 2)
0.9
2.0
0.9
μV
P-P
n
f = 10Hz (Note 2)
50
49
75
65
50
49
nV√Hz
nV√Hz
O
f = 1000Hz (Note 2)
O
i
n
Input Noise Current
0.1Hz to 10Hz (Note 2)
1.5
2.5
1.5
pA
P-P
Input Noise Current Density
f = 10Hz (Note 2)
O
0.03
0.01
0.07
0.03
0.01
pA√Hz
pA√Hz
O
f = 1000Hz
Input Resistance
Differential Mode
Common Mode
(Note 3)
0.8
2
12
0.6
2
12
GΩ
GΩ
Input Voltage Range
3.5
0
3.9
–0.3
3.5
0
3.9
–0.3
V
V
CMRR
PSRR
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Large-Signal Voltage Gain
V
= 0V to 3.5V
93
94
103
104
90
92
102
104
dB
dB
CM
V = 2.2V to 12V
S
A
VOL
V = 0.03V to 4V, No Load (Note 3)
140
80
700
200
110
70
700
200
V/mV
V/mV
O
V = 0.03V to 3.5V, R = 50k
O
L
Maximum Output Voltage Swing Output Low, No Load
Output Low, 2k to GND
Output Low, I = 100μA
6.5
0.2
120
9
0.6
160
6.5
0.2
120
9
0.6
160
mV
mV
mV
SINK
Output High, No Load
Output High, 2k to GND
4.2
3.5
4.4
3.8
4.2
3.5
4.4
3.8
V
V
SR
Slew Rate
A = 1, C = 10pF (Note 3)
0.013 0.025
60
0.013 0.025
60
V/μs
kHz
V
L
GBW
Gain Bandwidth Product
Supply Current per Amplifier
f ≤ 5kHz
O
I
S
13
12
18
17
14
13
21
20
μA
μA
V = 1.5V, V = 0V
S
O
Channel Separation
110
2
110
2
dB
V
ΔV = 3V, RL = 10k
IN
Minimum Supply Voltage
(Note 4)
2.2
2.2
The l denotes the specifications which apply over the full operating temperature range. VS = 5V, 0V, VCM = 0.1V, VO = 1.4V,
–40°C ≤ TA ≤ 85°C for I-grades, unless otherwise noted. (Note 6)
LT2178AI
TYP
LT2178I/LT2179I
SYMBOL PARAMETER
CONDITIONS
MIN
MAX
MIN
TYP
MAX UNITS
l
l
V
Input Offset Voltage
LT2178
LT2179
70
80
270
300
95
100
370
400
ꢀV
ꢀV
OS
l
Input Offset Voltage Drift
LT2178 (Note 5)
LT2179
0.4
0.5
1.8
3
0.5
0.6
2.3
3.5
μV/ºC
μV/ºC
ΔV
OS
ΔT
l
l
l
l
I
I
Input Offset Current
0.07
3
0.70
7
0.1
4
1
8
nA
nA
dB
dB
OS
Input Bias Current
B
CMRR
PSRR
Common Mode Rejection Ratio
Power Supply Rejection Ratio
V
= 0.05V to 3.2V
86
88
100
100
84
86
98
100
CM
V = 3V to 12V
S
21789fc
3
LT2178/LT2179
The l denotes the specifications which apply over the full operating
ELECTRICAL CHARACTERISTICS
temperature range. VS = 5V, 0V, VCM = 0.1V, VO = 1.4V, –40°C ≤ TA ≤ 85°C for I-grades, unless otherwise noted. (Note 6)
LT2178AI
TYP
LT2178I/LT2179I
SYMBOL PARAMETER
Large-Signal Voltage Gain
CONDITIONS
V = 0.05V to 4V, No Load (Note 3)
MIN
MAX
MIN
TYP
MAX UNITS
l
l
A
75
40
350
130
50
30
350
130
V/mV
V/mV
VOL
O
V = 0.05V to 3.5V, R = 50k
O
L
l
l
Maximum Output Voltage Swing Output Low, No Load
Output Low, I = 100μA
9
160
13
220
9
160
13
mV
220 mV
SINK
l
l
Output High, No Load
Output High, 2k to GND
3.9
3
4.2
3.7
3.9
3
4.2
3.7
V
V
l
I
S
Supply Current per Amplifier
15
24
15
27
μA
The l denotes the specifications which apply over the full operating temperature range. VS = 5V, 0V, VCM = 0.1V, VO = 1.4V,
0°C ≤ TA ≤ 70°C, unless otherwise noted. (Note 7)
LT2178AC/LT2179AC
LT2178C/LT2179C
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX UNITS
l
l
V
Input Offset Voltage
LT2178
LT2179
50
60
170
200
65
70
250
290
V/mV
V/mV
OS
l
l
Input Offset Voltage Drift
LT2178 (Note 5)
LT2179
0.4
0.5
1.8
3
0.5
0.6
2.5
3.5
mV
mV
ΔV
OS
ΔT
l
l
l
l
I
I
Input Offset Current
0.06
3
0.35
6
0.06
3
0.5
7
nA
nA
dB
dB
OS
Input Bias Current
B
CMRR
PSRR
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Large-Signal Voltage Gain
V
= 0V to 3.4V
90
90
101
102
86
88
100
102
CM
V = 2.5V to 12V
S
l
l
A
V = 0.05V to 4V, No Load (Note 3)
V = 0.05V to 3.5V, R = 50k
150
55
500
160
80
45
500
160
V/mV
V/mV
VOL
O
O
L
l
l
Maximum Output Voltage Swing Output Low, No Load
Output Low, I = 100μA
8
140
11
190
8
140
11
190
mV
mV
SINK
l
l
Output High, No Load
Output High, 2k to GND
4.1
3.3
4.3
3.8
4.1
3.3
4.3
3.8
V
V
VS = 15V, TA = 25°C, unless otherwise noted.
LT2178AC/LT2178AI
LT2179AC
LT2178C/LT2178I
LT2179C/LT2179I
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX UNITS
V
Input Offset Voltage
LT2178
LT2179
70
80
300
350
90
100
400
450
ꢀV
ꢀV
OS
I
I
Input Offset Current
Input Bias Current
Input Voltage Range
0.05
3
0.25
5
0.05
3
0.35
6
nA
nA
OS
B
13.5
13.9
–15 –15.3
13.5
13.9
–15 –15.3
V
V
CMRR
PSRR
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Large-Signal Voltage Gain
V
= 13.5V to –15V
96
96
106
112
93
94
106
112
dB
dB
CM
V = 5V, 0V to 18V
S
A
VOL
300
600
1200
2500
250
400
1000
2500
V/mV
V/mV
V = 10V, R = 50k
O
L
V = 10V, No Load
O
V
OUT
Maximum Output Voltage Swing R = 50k
V
V
13
11
14.2
12.7
13
11
14.2
12.7
L
R = 2k
L
SR
Slew Rate
A = 1
V
0.02
0.04
0.02
0.04
V/μs
21789fc
4
LT2178/LT2179
The l denotes the specifications which apply over the full operating
ELECTRICAL CHARACTERISTICS
temperature range. VS = 5V, 0V, VCM = 0.1V, VO = 1.4V, –40°C ≤ TA ≤ 85°C for I-grades, unless otherwise noted. (Note 6)
LT2178AC/LT2178AI
LT2179AC
LT2178C/LT2178I
LT2179C/LT2179I
SYMBOL PARAMETER
GBW Gain Bandwidth Product
Supply Current per Amplifier
CONDITIONS
f ≤ 5kHz
MIN
TYP
MAX
MIN
TYP
MAX UNITS
85
85
kHz
μA
O
I
16
21
17
25
S
The l denotes the specifications which apply over the full operating temperature range. VS = 15V, –40°C ≤ TA ≤ 85°C for I-grades,
unless otherwise noted.
LT2178AI
TYP
LT2178I/LT2179I
SYMBOL PARAMETER
CONDITIONS
MIN
MAX
MIN
TYP
MAX UNITS
l
l
V
Input Offset Voltage
LT2178
LT2179
100
100
650
650
130
130
740
740
μV
μV
OS
l
Input Offset Voltage Drift
LT2178 (Note 5)
LT2179
0.6
0.7
1.8
3
0.7
0.9
2.5
4
μV/ºC
μV/ºC
ΔV
OS
ΔT
l
l
l
l
l
l
l
I
I
Input Offset Current
0.07
3
0.7
7
0.1
4
1
8
nA
nA
OS
Input Bias Current
B
A
Large-Signal Voltage Gain
Common Mode Rejection Ratio
Power Supply Rejection Ratio
150
90
500
105
110
13.5
18
100
88
500
103
109
13.5
19
V/mV
dB
V = 10V, R = 50k
VOL
O
L
CMRR
PSRR
V
= 13V, –14.9V
CM
92
88
dB
V = 0V, 5V to 18V
S
Maximum Output Voltage Swing R = 5k
V
11
11
L
I
Supply Current per Amplifier
28
30
μA
S
The l denotes the specifications which apply over the full operating temperature range. VS = 15V, 0°C ≤ TA ≤ 70°C, unless otherwise noted.
LT2178AC/LT2179AC
LT2178C/LT2179C
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX UNITS
l
l
V
Input Offset Voltage
LT2178
LT2179
100
120
480
550
130
150
660
750
μV
μV
OS
l
Input Offset Voltage Drift
LT2178 (Note 5)
LT2179
0.6
0.7
1.5
3
0.7
0.9
2.5
4
μV/ºC
μV/ºC
ΔV
OS
ΔT
l
l
l
l
l
l
l
I
I
Input Offset Current
0.06
3
0.35
6
0.06
3
0.35
7
nA
nA
OS
Input Bias Current
B
A
Large-Signal Voltage Gain
Common Mode Rejection Ratio
Power Supply Rejection Ratio
200
94
800
104
110
13.6
17
150
91
750
104
110
13.6
18
V/mV
dB
V = 10V, R = 50k
VOL
O
L
CMRR
PSRR
V
= 13V, –15V
CM
R = 5k
L
93
91
dB
Maximum Output Voltage Swing R = 5k
V
11
11
L
I
Supply Current per Amplifier
24
28
μA
S
Note 4: This parameter is guaranteed by design and is not tested.
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 5: Power supply rejection ratio is measured at the minimum supply
voltage. The op amps actually work at 1.7V supply but with a typical offset
skew of –300μV.
Note 2: Typical parameters are defined as the 60% yield of parameter
distributions of individual amplifiers, i.e., out of 100 LT2179s (or 100
LT2178s) typically 240 op amps (or 120) will be better than the indicated
specification.
Note 6: This parameter is not 100% tested.
Note 7: During testing at –40°C, the 5V power supply turn-on time is less
than 0.5s.
Note 8: The LT2178C/LT2179C are designed, characterized and expected
to meet the industrial temperature limits, but are not tested at –40°C and
85°C. I-grade parts are guaranteed.
Note 3: This parameter is tested on a sample basis only. All noise
parameters are tested with V = 2.5V, V = 0V.
S
O
21789fc
5
LT2178/LT2179
TYPICAL PERFORMANCE CHARACTERISTICS
Distribution of Input
Offset Voltage
Input Bias and Offset Currents
vs Temperature
Minimum Supply Voltage
100
0
800
600
400
200
100
75
–
V
= 5V, 0V
= 25°C
S
A
V
= 5V, 0V
V
= 0V
S
T
2500 OP AMPS
TESTED
I
OS
50
–100
–200
–300
–400
–500
85°C
25
25°C
–2.5
–3.0
–3.5
–4.0
–40°C
I
B
NONFUCTIONAL
1
0
–150 –100 –50
0
50
100
150
2
3
50
TEMPERATURE (°C)
100
0
–50 –25
0
25
75
OFFSET VOLTAGE (μV)
POSITIVE SUPPLY VOLTAGE (V)
21789 G01
21789 G02
21789 G03
Output Saturation vs Temperature
vs Sink Current
Short-Circuit Current
0.1Hz to 10Hz Noise
20
10
1000
100
10
V
= 5V, 0V
S
T
= 25°C, V = p2.5V
S
A
I
= 1mA
SINK
V
= p15V
S
I
= 100μA
SINK
V
V
= p2.5V
= p2.5V
V
= 5V, 0V
S
S
S
0
CHANNEL A
I
= 1μA
SINK
NO LOAD
–10
–20
–30
10k TO GROUND
2k TO GROUND
1
V
= p15V
S
CHANNEL B
6
0.1
–50
0
4
8
10
12
0
1
2
2
–25
0
25
50
75
100
TIME (SECONDS)
TEMPERATURE (°C)
TIME FROM OUTPUT SHORT TO GROUND (MINUTES)
21789 G04
21789 G06
21789 G05
0.01Hz to 10Hz Noise
Noise Spectrum
Voltage Gain vs Frequency
1000
140
120
100
80
T
= 25°C, V = p2.5V
S
A
T
= 25°C
= p2.5V
A
S
T
= 25°C
A
V
300
100
CURRENT
NOISE
V
= p15V
S
CHANNEL A
60
V
= 5V, 0V
S
VOLTAGE NOISE
40
20
30
10
1/f CORNER
0.5Hz
0
CHANNEL B
60
–20
0.001 0.01
0
40
80
100
120
0.1
1
10
100
1000
20
10 100
100k 1M
0.1
1
1k 10k
TIME (SECONDS)
FREQUENCY (Hz)
FREQUENCY (Hz)
21789 G08
21789 G07
217879 G09
21789fc
6
LT2178/LT2179
TYPICAL PERFORMANCE CHARACTERISTICS
Gain, Phase vs Frequency
Voltage Gain vs Load Resistance
Capacitive Load Handling
10M
120
100
80
60
40
20
0
30
20
10
0
80
V
= 5V, 0V
S
T
= 25°C
A
NO LOAD
100
120
140
160
180
200
220
240
V = p15V, T = 25°C
S A
PHASE
p15V
1M
PHASE
5V, 0V,
A
A
= 1
= 5
V
= 5V, 0V, T = 25°C
V
S
A
100k
10k
GAIN
5V, 0V
V
= 5V, 0V, T = 85°C
A
S
V
A
= 10
V
GAIN
p15V
–10
10k
100k
1M
10M
10
100
1000
10000
10k
100k
FREQUENCY (Hz)
1M
LOAD RESISTANCE TO GROUND (Ω)
CAPACITIVE LOAD (pF)
217879 G11
20789 G12
21789 G10
Large-Signal Transient Response
VS = 15V
Large-Signal Transient Response
VS = 5V, 0V
Small-Signal Transient Response
VS = 2.5V
A
V
C
L
= 1
= 12pF
A
V
C
L
= 1
= 12pF
A
C
= 1
20μs/DIV
500μs/DIV
100μs/DIV
V
L
21789 G15
21789 G13
= 12pF
21789 G14
INPUT PULSE = 0V TO 3.8V
Small-Signal Transient Response
VS = 15V
Small-Signal Transient Response
VS = 5V, 0V
Common Mode Rejection Ratio
vs Frequency
120
T
= 25°C
A
100
80
60
40
20
0
V
S
= p15V
V
= 5V, 0V
S
A
V
C
L
= 1
= 12pF
20μs/DIV
A
C
= 1
20μs/DIV
V
L
21789 G16
= 12pF
21789 G17
1
10
100
1k
10k
100k
INPUT PULSE = 50mV TO 150mV
FREQUENCY (Hz)
21789 G18
21789fc
7
LT2178/LT2179
TYPICAL PERFORMANCE CHARACTERISTICS
Power Supply Rejection Ratio
vs Frequency
Closed Loop Output Impedance
120
T
= 25°C
A
S
10k
V
= 5V, 0V
100
I
= 0
L
1k
POSITIVE
SUPPLY
80
60
40
20
0
A
= 100
= 10
CL
NEGATIVE
SUPPLY
100
10
1
A
= 1
CL
A
CL
T
= 25°C
A
S
V
= p2.5V + 1V SINE WAVE
P-P
0.1
10
100
1k
10k 100k
10
1
100
1k
FREQUENCY (Hz)
10k
100k
OPERATING FREQUENCY (Hz)
21789 G19
21789 G20
SIMPLIFIED SCHEMATIC
1/2 LT2178
1/4 LT2179
+
V
33k
11.5k
12.5k
6.4k
10k
10k
Q6
2.2k
Q16
5.6k
1.3k
Q54
1
Q53
2
1
Q14
Q15
Q32
Q5
Q52
Q47
Q37
Q46
Q29
Q3
Q30
3
–
V
Q24
Q4
1
Q40
3k
Q26
Q25
Q41
8.6k
Q35
+
C1
50pF
Q12
4
V
C4
4pF
2.9k
30Ω
OUT
Q11
1
Q44
C5
2.5pF
Q27
Q1
Q21
150k
600Ω
600Ω
–
+
IN
Q31
C3
J1
40pF
Q18
Q36
Q28
Q2
Q22
Q33
Q48
+
IN
Q19
V
Q42
Q50
Q49
Q39
Q9
Q23
Q17
Q10
+
9.1k
V
700k
700k
Q51
Q55
C2
175pF
Q7
Q8
Q45
Q20
2A
10k
Q34
Q43
Q38
2A
5.35k
30Ω
6.2k
6.2k
3k
–
21789 SS
V
21789fc
8
LT2178/LT2179
APPLICATIONS INFORMATION
Please see the LT2078/LT2079 data sheet for applications
information.Allcommentsrelatingtospecifications,single
supplyoperationandphasereversalprotectionaredirectly
applicable to the LT2178/LT2179.
Micropower 100Hz to 1MHz V-to-F Converter
7V TO 10V
100k
1.5M
V
IN
0V TO 5V
10k
220k*
+
–
1N4148
100Ω
A2
1/2 LT2178
50k
+
+
NC
LT1004-2.5
1MHz
TRIM
1μF
100Hz TRIM
240k TYP
1μF
12k
Q8
Q7
2N3904
+
47k
A1
1/2 LT2178
2N3906
V
DD
CD4024
RESET
2k
–
0.01μF
CLK
Q7
0.33μF
V
74C14
10M
SS
3pF
F
OUT
2μF
LTC®201
+
1N1
1N3
V
500pF
POLYSTYRENE
S1
S3
D1
D2
D3
D4
1N4
1N2
0.022μF
S2
S4
LINEARITY IS 0.02%
QUIESCENT CURRENT IS 90μA
SUPPLY CURRENT IS 360μA AT 1MHz
DRIFT = 50ppm/°C
*TRWMTR/5 + 120ppm/°C
–
V
GND
21789 TA03
21789fc
9
LT2178/LT2179
PACKAGE DESCRIPTION
S8 Package
8-Lead Plastic Small Outline (Narrow 0.150)
(Reference LTC DWG # 05-08-1610)
.189 – .197
(4.801 – 5.004)
.045 p .005
NOTE 3
.050 BSC
7
5
8
6
.245
MIN
.160 p .005
.150 – .157
(3.810 – 3.988)
NOTE 3
.228 – .244
(5.791 – 6.197)
.030 p .005
TYP
1
3
4
2
RECOMMENDED SOLDER PAD LAYOUT
.010 – .020
(0.254 – 0.508)
s 45o
.053 – .069
(1.346 – 1.752)
.004 – .010
(0.101 – 0.254)
.008 – .010
(0.203 – 0.254)
0o– 8o TYP
.016 – .050
(0.406 – 1.270)
.050
(1.270)
BSC
.014 – .019
(0.355 – 0.483)
TYP
NOTE:
INCHES
1. DIMENSIONS IN
(MILLIMETERS)
3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
2. DRAWING NOT TO SCALE
SO8 0303
S Package
14-Lead Plastic Small Outline (Narrow 0.150)
(Reference LTC DWG # 05-08-1610)
.337 – .344
.045 p .005
(8.560 – 8.738)
.050 BSC
NOTE 3
13
12
11
10
8
14
N
9
N
1
.245
MIN
.160 p .005
.150 – .157
(3.810 – 3.988)
NOTE 3
.228 – .244
(5.791 – 6.197)
2
3
N/2
N/2
7
.030 p .005
TYP
RECOMMENDED SOLDER PAD LAYOUT
1
2
3
4
5
6
.010 – .020
(0.254 – 0.508)
s 45o
.053 – .069
(1.346 – 1.752)
.004 – .010
(0.101 – 0.254)
.008 – .010
(0.203 – 0.254)
0o – 8o TYP
.050
(1.270)
BSC
.014 – .019
(0.355 – 0.483)
TYP
.016 – .050
(0.406 – 1.270)
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)
S14 0502
21789fc
10
LT2178/LT2179
REVISION HISTORY (Revision history begins at Rev C)
REV
DATE
DESCRIPTION
PAGE NUMBER
C
3/10
Correct the part numbers on S Package in the Order Information Section.
Update to graph G04
2
6
21789fc
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
11
LT2178/LT2179
TYPICAL APPLICATION
Single Supply, 1kHz, 4th Order Butterworth Lowpass Filter
C1
1000pF
C2
1000pF
R1
301k
1000pF
R2
86k
V
–
+
IN
1000pF
1/4
–
+
LT2179
121k
1/4
LT2179
–
+
221k
121k
1/4
LT2179
–
+
1/4
LT2179
V
301k
50k
OUT
21789 TA04
3.3V
+
50k
1μF
10
0
12-BIT ACCURATE SIGNAL RANGE FROM 6mV TO 1.8V ON 3.3V SINGLE SUPPLY.
MAXIMUM OUTPUT OFFSET ERROR IS 448μV.
–10
–20
–30
–40
–50
–60
–70
–80
–90
FOR EACH 2ND ORDER SECTION:
1
C1C2R1R2
1
2
W
=
O
R1 =
R2 =
W QC1
O
Q
W C2
O
0.1
1
10
FREQUENCY (kHz)
21789 TA05
RELATED PARTS
PART NUMBER DESCRIPTION
COMMENTS
LT1078/LT1079 Dual/Quad 55μA Max, Single Supply Precision Op Amps
70μV V Max and 2.5μV/°C Drift Max, 200kHz BBW,
OS
0.07V/μs Slew Rate, Input/Output Common Mode Includes Ground
LT1211/LT1212 14MHz, 7V/μs Single Supply Dual and Quad Precision Op Amps 275μV V Max, 6μV/°C Drift Max Input Voltage Range Includes Ground
OS
LT1490/LT1491 Dual/ Quad Micropower Rail-to-Rail Input and Output Op Amps Single Supply Input Range: –0.4V to 44V, Micropower 50μA Amplifier,
Rail-to-Rail Input and Output, 200kHz GBW
LT2078/LT2079 Dual/Quad 55μA Max, Single Supply Precision Op Amps
70μV V Max and 2.5μV/°C Drift Max, 200kHz BBW,
OS
0.07V/μs Slew Rate, Input/Output Common Mode Includes Ground
Surface Mount Standard Pinout
21789fc
LT 0310 REV C • PRINTED IN USA
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
12
●
●
© LINEAR TECHNOLOGY CORPORATION 1996
(408) 432-1900 FAX: (408) 434-0507 www.linear.com
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