LT1178/LT1179
1
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The LT
®
1178 is a micropower dual op amp in the standard
8-pin configuration; the LT1179 is a micropower quad op
amp offered in the standard 14-pin packages. Both
devices are optimized for single supply operation at 5V.
Specifications are also provided at ±15V supplies.
The extremely low supply current is combined with true
precision specifications: offset voltage is 30µV, offset
current is 50pA. Both offset parameters have low drift with
temperature. The 1.5pAp-p current noise and picoampere
offset current permit the use of megaohm level source
resistors without introducing serious errors. Voltage noise,
at 0.9µVp-p, is remarkably low considering the low
supply current.
Both the LT1178 and LT1179 can be operated from a
single supply (as low as one lithium cell or two NiCd
batteries). The input range goes below ground. The
all-NPN output stage swings to within a few millivolts of
ground while sinking current—no power consuming pull
down resistors are needed.
For applications where three times higher supply
current is acceptable, the micropower LT1077 single,
LT1078 dual and LT1079 quad are recommended. The
LT1077/78/79 have significantly higher bandwidth, slew
rate, lower voltage noise and better output drive capability.
■
17µA Max Supply Current per Amplifier
■
70µV Max Offset Voltage
■
250pA Max Offset Current
■
5nA Max Input Bias Current
■
0.9µV
P-P
0.1Hz to 10Hz Voltage Noise
■
1.5pA
P-P
0.1Hz to 10Hz Current Noise
■
0.5µV/°C Offset Voltage Drift
■
85kHz Gain-Bandwidth Product
■
0.04V/µs Slew Rate
■
Single Supply Operation:
Input Voltage Range Includes Ground
Output Swings to Ground While Sinking Current
No Pull Down Resistors are Needed
■
Output Sources and Sinks 5mA Load Current
17µA Max, Dual and Quad,
Single Supply, Precision Op Amps
Self-Buffered, Dual Output, Micropower Reference Supply Current vs Temperature
■
Battery or Solar Powered Systems
Portable Instrumentation
Remote Sensor Amplifier
Satellite Circuitry
■
Micropower Sample-and-Hold
■
Thermocouple Amplifier
■
Micropower Filters
TEMPERATURE (°C)
–50
10
SUPPLY CURRENT PER AMPLIFIER (µA)
12
14
16
–25 025 50
LT1178/LT1179 • TA02
75
18
20
100
VS = ±15V
VS = 5V, 0V
VS = ±1.5V
FEATURES
DESCRIPTIO
U
APPLICATIO S
U
TYPICAL APPLICATIO
U
+
–
–
+
2
2M
1M* 1M*
1
250k*
0.1µF
0.1µF
LT1004-1.2
1/2 LT1178
1/2 LT1178
4
6
58
4V TO 9V
1.2365V
OUTPUT
2.470V
OUTPUT
TOTAL BATTERY CURRENT
OUTPUT ACCURACY
TEMPERATURE COEFFICIENT
LOAD REGULATION
LINE REGULATION
*
= 28µA
= ±0.4% MAX
= 20ppm/°C
= 25ppm/mA, I
L
≤ 5mA, V
+
≥ 5V
= 10ppm/V
= 0.1% FILM RESISTORS
7
3
LT1178/LT1179 • TA01
, LTC and LT are registered trademarks of Linear Technology Corporation.
LT1178/LT1179
2
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Supply Voltage ...................................................... ±22V
Differential Input Voltage ....................................... ±30V
Input Voltage ............... Equal to Positive Supply Voltage
Input Voltage ............5V Below Negative Supply Voltage
Output Short-Circuit Duration .......................... Indefinite
Consult LTC Marketing for parts specified with wider operating temperature ranges. Please note that the LT1178S8 surface mount pinout differs from that
of the LT1178 standard plastic or ceramic dual-in-line packages. For similiar performance with standard pinout, see the LT2178.
(Note 1)
ABSOLUTE AXI U RATI GS
WWWU
PACKAGE/ORDER I FOR ATIO
UU
W
Operating Temperature Range
LT1178I/LT1179I .................................. –40°C to 85°C
LT1178C/LT1178S/LT1179C/LT1179S .......0°C to 70°C
Storage Temperature Range ................ –65°C to 150°C
Lead Temperature (Soldering, 10 sec.)................. 300°C
LT1178ACH
LT1178CH
ORDER PART
NUMBER
LT1178ACN8
LT1178CN8
LT1178IN8
LT1178ACJ8
LT1178CJ8
LT1179ACN
LT1179CN
LT1179IN
LT1179ACJ
LT1179CJ
LT11778/1179 • POI01
1
2
3
4
5
6
7
8
TOP VIEW
16
15
14
13
12
11
10
9
OUT A
–IN A
+IN A
V+
+IN B
–IN B
OUT B
NC
OUT D
–IN D
+IN D
V–
+IN C
–IN C
OUT C
NC
ORDER PART
NUMBER
LT1178SW
LT1179SW
ORDER PART
NUMBER
ORDER PART
NUMBER
ORDER PART
NUMBER
TOP VIEW
OUT B
V+
OUT A
–IN A –IN B
IN A + IN B
V– (CASE)
8
7
5
3
2
1
4
H PACKAGE
8-LEAD TO-5 METAL CAN
A
+
–
+
–
B
1
2
3
4
8
7
6
5
TOP VIEW
OUT A
–IN A
+IN A
V–
V+
OUT B
–IN B
+IN B
N PACKAGE
8-LEAD PDIP
B-
+
A
-
+
1
2
3
4
5
6
7
TOP VIEW
J PACKAGE 14-LEAD CERAMIC DIP
N PACKAGE
14-LEAD PDIP
14
13
12
11
10
9
8
OUT A
–IN A
+IN A
V+
+IN B
–IN B
OUT B
OUT D
–IN D
+IN D
V–
+IN C
–IN C
OUT C
D
-
+
A
-
+
C
+
-
B
+
-
S8 PACKAGE
8-LEAD PLASTIC SO
T
JMAX
= 150°C, θ
JA
= 200°C/W
PART
MARKING
LT1178S8
1178
J PACKAGE 8-LEAD CERDIP
OBSOLETE PACKAGE
Consider the N8 or S8 Package for Alternate Source
OBSOLETE PACKAGE
Consider the N14 Package for Alternate Source
SW PACKAGE
16-LEAD PLASTIC SO WIDE
1
2
3
4
8
7
6
5
TOP VIEW
–IN A
OUT A
V+
OUT B
+IN A
V–
+IN B
–IN B
SW PACKAGE
16-LEAD PLASTIC SO WIDE
1
2
3
4
5
6
7
8
TOP VIEW
16
15
14
13
12
11
10
9
NC
NC
OUT A
–IN A
+IN A
V–
NC
NC
NC
NC
V+
OUT B
–IN B
+IN B
NC
NC
LT1178 LT1179
T
JMAX
= 100°C, θ
JA
= 150°C/W
T
JMAX
= 150°C, θ
JA
= 90°C/W T
JMAX
= 150°C, θ
JA
= 90°C/W
T
JMAX
= 110°C, θ
JA
= 130°C/W
Not Recommended. Use LT1178S8 for
New Designs.
A
-
+
B
-
+
ELECTRICAL CHARACTERISTICS
VS = 5V, 0V; VCM = 0.1V, VO = 1.4V, TA = 25°C, unless noted.
LT1178AC/LT1179AC LT1178I/C/S/LT1179I/C/S
SYMBOL PARAMETER CONDITIONS (NOTE 2) MIN TYP MAX MIN TYP MAX UNITS
VOS Input Offset Voltage LT1178 30 70 40 120 µV
LT1179 35 100 40 150 µV
LT1178SW 80 450 µV
LT1179SW 90 600 µV
LT1178S8 60 180 µV
∆VOS Long Term Input Offset 0.5 0.6 µV/Mo
∆Time Voltage Stability
IOS Input Offset Current 0.05 0.25 0.05 0.35 nA
LT1178/LT1179
3
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VS = 5V, 0V; VCM = 0.1V, VO = 1.4V, TA = 25°C, unless noted.
ELECTRICAL CHARACTERISTICS
LT1178AC/LT1179AC LT1178I/C/S/LT1179I/C/S
SYMBOL PARAMETER CONDITIONS (NOTE 2) MIN TYP MAX MIN TYP MAX UNITS
IBInput Bias Current 3 5 3 6 nA
enInput Noise Voltage 0.1Hz to 10Hz (Note 3) 0.9 2.0 0.9 µVP-P
Input Noise Voltage Density fO = 10Hz (Note 3) 50 75 50 nV/√Hz
fO = 1000Hz (Note 3) 49 65 49 nV/√Hz
inInput Noise Current 0.1Hz to 10Hz (Note 3) 1.5 2.5 1.5 pAp-p
Input Noise Current Density fO = 10Hz (Note 3) 0.03 0.07 0.03 pA/√Hz
fO = 1000Hz 0.01 0.01 pA/√Hz
Input Resistance (Note 4)
Differential Mode 0.8 2.0 0.6 2.0 GΩ
Common Mode 12 12 GΩ
Input Voltage Range 3.5 3.9 3.5 3.9 V
0–0.3 0 –0.3 V
CMRR Common Mode Rejection Ratio VCM = 0V to 3.5V 93 103 90 102 dB
PSRR Power Supply Rejection Ratio VS = 2.2V to 12V 94 104 92 104 dB
AVOL Large Signal Voltage Gain VO = 0.03V to 4V, No Load 140 700 110 700 V/mV
(Note 4)
VO = 0.03V to 3.5V, RL = 50k 80 200 70 200 V/mV
Maximum Output Voltage Output Low, No Load 6.5 9 6.5 9 mV
Swing Output Low, 2k to GND 0.2 0.6 0.2 0.6 mV
Output Low, ISINK = 100µA120 160 120 160 mV
Output High, No Load 4.2 4.4 4.2 4.4 V
Output High 2k to GND 3.5 3.8 3.5 3.8 V
SR Slew Rate AV = 1, CL = 10pF (Note 4) 0.013 0.025 0.013 0.025 V/µs
GBW Gain Bandwidth Product fO ≤ 5kHz 60 60 kHz
ISSupply Current 13 18 14 21 µA
per Amplifier VS = ±1.5V, VO = 0V 12 17 13 20 µA
Channel Separation ∆VIN = 3V, RL = 10k 130 130 dB
Minimum Supply Voltage (Note 5) 2.0 2.2 2.0 2.2 V
LT1178/LT1179
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ELECTRICAL CHARACTERISTICS
LT1178I/LT1179I LT1178SW/LT1179SW
SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS
VOS lnput Offset Voltage LT1178 ●80 315 120 650 µV
LT1179 ●80 345 130 800 µV
∆VOS/∆TInput Offset Voltage Drift (Note 6) ●0.6 3.0 0.8 4.5 µV/°C
IOS Input Offset Current ●0.07 0.7 0.06 0.50 nA
IBInput Bias Current ●48 37 nA
CMRR Common Mode Rejection VCM = 0.05V to 3.2V I grade ●84 98 86 100 dB
Ratio VCM = 0V to 3.4V S grade
PSRR Power Supply Rejection VS = 3.0V to 12V I grade ●86 100 88 102 dB
Ratio VS = 2.5V to 12V S grade
AVOL Large-Signal Voltage Gain VO = 0.05V to 4V, No Load (Note 4) ●55 350 80 500 V/mV
VO = 0.05V to 3.5V, RL = 50k ●35 130 45 160 V/mV
Maximum Output Voltage Output Low, No Load ●913 811 mV
Swing Output Low, ISINK = 100µA●160 220 140 190 mV
Output High, No Load ●3.9 4.2 4.1 4.3 V
Output High, 2k to GND ●3.0 3.7 3.3 3.8 V
ISSupply Current per Amplifier ●15 27 15 24 µA
The ● denotes specifications which apply over the full operating
temperature range of –40°C ≤ TA ≤ 85°C for I grades, 0°C ≤ TA ≤ 70°C for SW grades, VS = 5V, 0V; VCM = 0.1V, VO = 1.4V, unless
noted. (Note 7)
LT1178AC/LT1179AC LT1178C/S8/LT1179C
SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS
V
OS
lnput Offset Voltage LT1178 ●50 170 65 250 µV
LT1178S8 ●85 350 µV
LT1179 ●60 200 70 290 µV
∆V
OS
/∆TInput Offset Voltage Drift (Note 6) ●0.5 2.2 0.6 3.0 µV/°C
LT1178S8 ●0.6 3.5 µV/°C
I
OS
Input Offset Current ●0.06 0.35 0.06 0.50 nA
I
B
Input Bias Current ●36 37 nA
CMRR Common Mode Rejection Ratio V
CM
= 0V to 3.4V ●90 101 86 100 dB
PSRR Power Supply Rejection Ratio V
S
= 2.5V to 12V ●90 102 88 102 dB
A
VOL
Large-Signal Voltage Gain V
O
= 0.05V to 4V, No Load (Note 4) ●105 500 80 500 V/mV
V
O
= 0.05V to 3.5V, R
L
= 50k ●55 160 45 160 V/mV
Maximum Output Voltage Output Low, No Load ●811 811 mV
Swing Output Low, I
SINK
= 100µA●140 190 140 190 mV
Output High, No Load ●4.1 4.3 4.1 4.3 V
Output High, 2k to GND ●3.3 3.8 3.3 3.8 V
I
S
Supply Current per Amplifier ●14 21 15 24 µA
The ● denotes specifications which apply over the full operating temperature range of 0°C ≤ TA ≤ 70°C, VS = 5V, 0V, VCM = 0.1V,
VO = 1.4V, unless noted.
LT1178/LT1179
5
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ELECTRICAL CHARACTERISTICS
LT1178AC/LT1179AC LT1178I/C/S/LT1179I/C/S
SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS
V
OS
Input Offset Voltage 80 350 100 480 µV
LT1178SW 150 900 µV
LT1179SW 160 1050 µV
LT1178S8 120 350 µV
I
OS
lnput Offset Current 0.05 0.25 0.05 0.35 nA
I
B
Input Bias Current 3 5 3 6 nA
Input Voltage Range 13.5 13.9 13.5 13.9 V
–15.0 –15.3 –15.0 –15.3 V
CMRR Common Mode Rejection Ratio V
CM
= 13.5V, –15V 97 106 94 106 dB
PSRR Power Supply Rejection Ratio V
S
= 5V, 0V to ±18V 96 112 94 112 dB
A
VOL
Large-Signal Voltage Gain V
O
= ±10V, R
L
= 50k 300 1200 250 1000 V/mV
V
O
= ±10V, No Load 600 2500 400 2500 V/mV
V
OUT
Maximum Output Voltage Swing R
L
= 50k ±13.0 ±14.2 ±13.0 ±14.2 V
R
L
= 2k ±11.0 ±12.7 ±11.0 ±12.7 V
SR Slew Rate A
V
= 1 0.02 0.04 0.02 0.04 V/µs
GBW Gain Bandwidth Product f
O
≤ 5kHz 85 85 kHz
I
S
Supply Current per Amplifier 16 21 17 25 µA
VS = ±15V, TA = 25°C, unless noted.
LT1178I/LT1179I LT1178SW/LT1179SW
SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS
V
OS
lnput Offset Voltage LT1178 ●130 740 190 1150 µV
LT1179 ●130 740 200 1300 µV
∆V
OS
/∆TInput Offset Voltage Drift (Note 6) ●0.7 4.0 0.9 5.5 µV/°C
I
OS
Input Offset Current ●0.07 0.7 0.06 0.35 nA
I
B
Input Bias Current ●48 37 nA
A
VOL
Large-Signal Voltage Gain V
O
= ±10V, R
L
= 50k ●100 500 150 750 V/mV
CMRR Common Mode Rejection Ratio V
CM
= 13V, –14.9V ●88 103 91 104 dB
PSRR Power Supply Rejection Ratio V
S
= 5V, 0V to ±18V ●88 109 91 110 dB
Maximum Output Voltage Swing R
L
= 5k ●±11.0 ±13.5 ±11.0 ±13.5 V
I
S
Supply Current per Amplifier ●19 30 18 28 µA
The ● denotes specifications which apply over the full operating temperature range of –40°C ≤ TA ≤ 85°C for I grades,
0°C ≤ TA ≤ 70°C for SW grades, VS = ±15V, unless noted.
LT1178/LT1179
6
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LT1178AC/LT1179AC LT1178C/S8/LT1179C
SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS
V
OS
lnput Offset Voltage ●100 480 130 660 µV
LT1178S8 ●150 540 µV
∆V
OS
/∆TInput Offset Voltage Drift (Note 6) ●0.6 2.8 0.7 4.0 µV/°C
LT1178S8 ●0.7 3.8 µV/°C
I
OS
Input Offset Current ●0.06 0.35 0.06 0.35 nA
I
B
Input Bias Current ●36 37 nA
A
VOL
Large-Signal Voltage Gain V
O
= ±10V, R
L
= 50k ●200 800 150 750 V/mV
CMRR Common Mode Rejection Ratio V
CM
= 13V, –15V ●94 104 91 104 dB
PSRR Power Supply Rejection Ratio V
S
= 5V, 0V to ±18V ●93 110 91 110 dB
Maximum Output Voltage Swing R
L
= 5k ●±11.0 ±13.6 ±11.0 ±13.6 V
I
S
Supply Current per Amplifier ●17 24 18 28 µA
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: Typical parameters are defined as the 60% yield of parameter
distributions of individual amplifiers; (i.e., out of 100 LT1179s, or 100
LT1178s, typically 240 op amps, or 120, will be better than the indicated
specification).
Note 3: This parameter is tested on a sample basis only. All noise
parameters are tested with V
S
= ±2.5, V
O
= 0V.
Note 4: This parameter is guaranteed by design and is not tested.
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 6: This parameter is not 100% tested.
Note 7: During testing at –40°C, the 5V power supply turn on-time is less
than 0.5 seconds.
ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the full operating tempera-
ture range of 0°C ≤ TA ≤ 70°C, VS = ±15V, unless noted.
Input Offset Voltage Distribution
N, J, H Package
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Minimum Supply Voltage
Input Offset Voltage Distribution
Surface Mount Package
OFFSET VOLTAGE (µV)
–150
0
NUMBER OF OP AMPS
500
1000
1500
2000
–100 –50 0 50
LT1178/LT1179 • TPC01
100 150
980
190
190
702
144
6104
LT1178N8
LT1178J8
LT1178H8
LT1179N
LT1179J
OP AMPS
TESTED
V
S
= 5V, 0V
T
A
= 25°C
OFFSET VOLTAGE (µV)
– 600
0
NUMBER OF OP AMPS
200
400
600
800
– 400 –200 0 200
LT1178/LT1179 • TPC02
400 600
262
342
1892
LT1178SW
LT1179SW
OP AMPS
TESTED
V
S
= 5V, 0V
T
A
= 25°C
POSITIVE SUPPLY VOLTAGE (V)
0
OFFSET VOLTAGE SHIFT (µV)
–100
0
100
LT1178/LT1179 • TPC03
–200
–300
123
–400
–500
V
–
= 0V
NON-FUNCTIONAL
85°C
25°C
–40°C
LT1178/LT1179
7
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TYPICAL PERFOR A CE CHARACTERISTICS
UW
Input Bias and Offset Currents vs
Temperature Short-Circuit Current
Output Saturation vs Temperature
vs Sink Current
0.1Hz to 10Hz Noise Noise Spectrum0.01Hz to 10Hz Noise
TEMPERATURE (°C)
–50
100
75
50
25
–2.5
–3.0
–3.5
– 4.0 25 75
LT1178/LT1179 • TPC04
–25 0 50 100
INPUT BIAS
CURRENT (nA)
INPUT OFFSET
CURRENT (pA)
V
S
= 5V, 0V
I
OS
I
B
TEMPERATURE (°C)
1000
100
10
1
0.1
–50 25 75
–25 0 50 100
VS = 5V, 0V ISINK = 1mA
ISINK = 100µA
ISINK = 1µA
NO LOAD
10k TO GROUND
2k TO GROUND
LT1178/LT1179 • TPC05
SATURATION VOLTAGE (mV)
TIME (SECONDS)
0
NOISE VOLTAGE (0.4µV/DIV)
LT1178/LT1179 • TPC07
426 12
810
V
S
= ±2.5V, TA = 25°C
CHANNEL A
CHANNEL B
TIME (SECONDS)
0
NOISE VOLTAGE (0.4µV/DIV)
LT1178/LT1179 • TPC08
4020 60 120
80 100
V
S
= ±2.5V, TA = 25°C
CHANNEL A
CHANNEL B
FREQUENCY (Hz)
30
VOLTAGE NOISE DENSITY (nV/√Hz)
CURRENT NOISE DENSITY (fA/√Hz)
100
1000
0.1 10 100 1k
LT1178/LT1179 • TPC09
10
1
300
V
S
= ±2.5V
T
A
= 25°C
CURRENT
NOISE
VOLTAGE NOISE
1/f CORNER
0.5Hz
TIME FROM OUTPUT SHORT TO GROUND (MINUTES)
0
SHORT-CIRCUIT CURRENT (mA)
0
10
20
2
LT1178/LT1179 • TPC06
–10
–20
–30 1
SINKING SOURCING
V
S
= 5V, 0V
V
S
= ±15V
V
S
= ±2.5V
V
S
= ±2.5V
V
S
= ±15V
Voltage Gain vs Frequency Voltage Gain vs Load ResistanceGain, Phase vs Frequency
LT1178/LT1179 • TPC10
FREQUENCY (Hz)
0.001 0.01 0.1 1
VOLTAGE GAIN (dB)
60
80
100
100k
40
20
–20 10 100 1k 10k 1M
0
140
120
V
S
= 5V, 0V
V
S
= ±15V
T
A
= 25°C
FREQUENCY (Hz)
VOLTAGE GAIN (dB)
PHASE SHIFT (DEGREES)
10k 100k 1M
LT1178/LT1179 • TPC11
10
20
0
–10
30
160
140
120
180
200
240
220
80
100
T
A
= 25°C
NO LOAD
GAIN
±15V
GAIN
5V, 0V
PHASE
±15V
PHASE
5V, 0V
LOAD RESISTANCE TO GROUND (Ω)
VOLTAGE GAIN (V/V)
LT1178/LT1179 • TPC12
10k
10k 100k 1M 10M
100k
1M
10M
V
S
= ±15V, T
A
= 25°C
V
S
= 5V, 0V, T
A
= 85°C
V
S
= 5V, 0V, T
A
= 25°C
LT1178/LT1179
8
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TYPICAL PERFOR A CE CHARACTERISTICS
UW
Capacitive Load Handling
Large-Signal Transient Response
VS = 5V, 0V
Large-Signal Transient Response
VS = ±15V
Small-Signal Transient Response
VS = ±2.5V
Small-Signal Transient Response
VS = ±15V
Small-Signal Transient Response
VS = 5V, 0V
500µs/DIVA
V
= 1
C
L
= 12pF
100µs/DIVA
V
= 1
C
L
= 12pF
INPUT PULSE = 0V TO 3.8V
1V/DIV
A
V
= 1
C
L
= 12pF
20mV/DIV
A
V
= 1
C
L
= 12pF
20mV/DIV
20µs/DIVA
V
= 1
C
L
= 12pF
INPUT 50 TO 150mV
20mV/DIV
20µs/DIV 20µs/DIV
–100mV
Common Mode Rejection Ratio vs
Frequency Closed Loop Output Impedance
Power Supply Rejection Ratio vs
Frequency
FREQUENCY (Hz)
0.1
0
POWER SUPPLY REJECTION RATIO (dB)
20
40
60
80
120
110 100 1k
LT1188/LT1189 • TPC20
10k 100k
100
V
S
= ±2.5V + 1Vp-p SINE WAVE
T
A
= 25°C
POSITIVE
SUPPLY
NEGATIVE
SUPPLY
FREQUENCY (Hz)
10
OUTPUT IMPEDANCE (Ω)
1
10
100
1k
100 1k
LT1178/1179 • TPC21
10k
10k 100k
V
S
= 5V, 0V
I
L
= 0
T
A
= 25°C
A
CL
= 1
A
CL
= 10
A
CL
= 100
FREQUENCY (Hz)
1
0
COMMON MODE REJECTION RATIO (dB)
20
40
60
80
100
120
10 100 1k 10k
LT1178/LT1179 • TPC19
100k
V
S
= 5V, 0V
V
S
= ±15V
T
A
= 25°C
CAPACITIVE LOAD (pF)
OVERSHOOT (%)
0
10 100 1000 10,000
40
80
20
60
100
120
VS = 5V, 0V
AV = 1
AV = 5 AV = 10
LT1178/LT1179 • TPC13
LT1178/LT1179
9
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Micropower 100Hz to 1MHz V-to-F Converter
APPLICATIO S I FOR ATIO
WUUU
Please see the LT1078/LT1079 data sheet for applications
information. All comments relating to specifications, single
supply operation and phase reversal protection are
directly applicable to the LT1178/LT1179.
LINEARITY IS 0.02%
QUIESCENT CURRENT IS 90µA
SUPPLY CURRENT IS 360µA AT 1MHz
DRIFT ≈ 50ppm/°C
*TRW MTR/5 + 120ppm/°C
–
+
–
+
V
IN
0V TO 5V
50k
1MHz
TRIM
220k*
2k
2µF
0.33µF
47k
10M
F
OUT
V
DD
V
SS
12k
3pF
500pF
POLYSTYRENE
LTC201
74C14
NC
CLK
GND
10k
100k
7V TO 10V
LT1178/LT1179 • AI01
LT1004– 2.5
RESET
CD4024
A1
1/2 LT1178
A2
1/2 LT1178
Q7
1N4148 100Ω
Q8
2N3906
Q7
2N3904
1.5M
0.01µF
0.022µF
S1
D2
S2
D1
S3
IN1 V
+
V
–
IN4
IN3
IN2
D4
S4
D3
1µF1µF
100Hz
TRIM
240k
TYPICAL
+ +
1/2 LT1178
1/4 LT1179
SI PLIFIED SCHE ATIC
WW
10k
Q5 Q6 Q16 Q14 Q15 Q32
Q37
Q29
Q24
Q27
Q28
Q39
V+
V+
V+
V+
Q44
Q40
Q41
Q52
Q46
Q47
Q53
Q35
33k
150k
2
1
1
12.5k11.5k
V–
V–
Q4 C1
50pF
C5
2.5pF
C4
4pF
C2
175pF
C3
40pF
Q3
Q12
Q1
Q2
Q22
Q7 Q8
Q10 Q17
Q18
Q19
Q20
2A
3k
Q23
Q31
Q36 Q33
10k
30Ω
Q38 2A
Q45
Q55
Q51
Q43
5.35k
A
9.1k 700k
700k
Q49
Q48
Q42
J1
Q50
OUT
30Ω
6.2k 6.2k
Q21
600Ω
IN
IN
–
+
600Ω
4
1
1
3
3k
2.9k Q26
Q25
10k 2.2k
8.6k
5.6k 1.3k 6.4k
Q11
Q9
Q54
Q34
Q30
LT1178/LT1179
10
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U
PACKAGE DESCRIPTIO
OBSOLETE PACKAGES
H Package
8-Lead TO-5 Metal Can (.230 Inch PCD)
(Reference LTC DWG # 05-08-1321)
.050
(1.270)
MAX
.016 – .021**
(0.406 – 0.533)
.010 – .045*
(0.254 – 1.143)
SEATING
PLANE
.040
(1.016)
MAX .165 – .185
(4.191 – 4.699)
GAUGE
PLANE
REFERENCE
PLANE
.500 – .750
(12.700 – 19.050)
.305 – .335
(7.747 – 8.509)
.335 – .370
(8.509 – 9.398)
DIA
.230
(5.842)
TYP
.027 – .045
(0.686 – 1.143)
.028 – .034
(0.711 – 0.864)
.110 – .160
(2.794 – 4.064)
INSULATING
STANDOFF
45°TYP
H8 (TO-5) 0.230 PCD 0801
LEAD DIAMETER IS UNCONTROLLED BETWEEN THE REFERENCE PLANE
AND THE SEATING PLANE
FOR SOLDER DIP LEAD FINISH, LEAD DIAMETER IS .016 – .024
(0.406 – 0.610)
*
**
PIN 1
J8 Package
8-Lead CERDIP (Narrow .300 Inch, Hermetic)
(Reference LTC DWG # 05-08-1110)
J8 0801
.014 – .026
(0.360 – 0.660)
.015 – .060
(0.381 – 1.524)
.125
3.175
MIN
.100
(2.54)
BSC
.300 BSC
(7.62 BSC)
.008 – .018
(0.203 – 0.457) 0° – 15°
.045 – .065
(1.143 – 1.651)
.045 – .068
(1.143 – 1.650)
FULL LEAD
OPTION
.023 – .045
(0.584 – 1.143)
HALF LEAD
OPTION
CORNER LEADS OPTION
(4 PLCS)
.200
(5.080)
MAX
.005
(0.127)
MIN
.405
(10.287)
MAX
.220 – .310
(5.588 – 7.874)
1234
87
65
.025
(0.635)
RAD TYP
NOTE: LEAD DIMENSIONS APPLY TO SOLDER
DIP/PLATE OR TIN PLATE LEADS
J Package
14-Lead CERDIP (Narrow .300 Inch, Hermetic)
(Reference LTC DWG # 05-08-1110)
.300 BSC
(7.62 BSC)
.008 – .018
(0.203 – 0.457) 0° – 15°
J14 0801
.045 – .065
(1.143 – 1.651)
.100
(2.54)
BSC
.014 – .026
(0.360 – 0.660)
.200
(5.080)
MAX
.015 – .060
(0.381 – 1.524)
.125
(3.175)
MIN
NOTE: LEAD DIMENSIONS APPLY
TO SOLDER DIP/PLATE OR TIN
PLATE LEADS
1234567
.220 – .310
(5.588 – 7.874)
.785
(19.939)
MAX
.005
(0.127)
MIN 14 11 891013 12
.025
(0.635)
RAD TYP
LT1178/LT1179
11
11789fb
U
PACKAGE DESCRIPTIO
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-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
N Package
14-Lead PDIP (Narrow .300 Inch)
(Reference LTC DWG # 05-08-1510)
N8 Package
8-Lead PDIP (Narrow .300 Inch)
(Reference LTC DWG # 05-08-1510)
N8 1002
.065
(1.651)
TYP
.045 – .065
(1.143 – 1.651)
.130 ± .005
(3.302 ± 0.127)
.020
(0.508)
MIN
.018 ± .003
(0.457 ± 0.076)
.120
(3.048)
MIN
12 34
87 65
.255 ± .015*
(6.477 ± 0.381)
.400*
(10.160)
MAX
.008 – .015
(0.203 – 0.381)
.300 – .325
(7.620 – 8.255)
.325 +.035
–.015
+0.889
–0.381
8.255
()
NOTE:
1. DIMENSIONS ARE INCHES
MILLIMETERS
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm)
.100
(2.54)
BSC
N14 1002
.020
(0.508)
MIN
.120
(3.048)
MIN
.130 ± .005
(3.302 ± 0.127)
.045 – .065
(1.143 – 1.651)
.065
(1.651)
TYP
.018 ± .003
(0.457 ± 0.076)
.005
(0.125)
MIN
.255 ± .015*
(6.477 ± 0.381)
.770*
(19.558)
MAX
31 24567
8910
11
1213
14
.008 – .015
(0.203 – 0.381)
.300 – .325
(7.620 – 8.255)
.325 +.035
–.015
+0.889
–0.381
8.255
()
NOTE:
1. DIMENSIONS ARE INCHES
MILLIMETERS
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm)
.100
(2.54)
BSC
LT1178/LT1179
12
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U
PACKAGE DESCRIPTIO
S8 Package
8-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610)
SW Package
16-Lead Plastic Small Outline (Wide .300 Inch)
(Reference LTC DWG # 05-08-1620)
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com
LW/TP 1102 1K REV B • PRINTED IN USA
LINEAR TECHNOLOGY COR PORATION 1991
.016 – .050
(0.406 – 1.270)
.010 – .020
(0.254 – 0.508)× 45°
0°– 8° TYP
.008 – .010
(0.203 – 0.254)
SO8 0502
.053 – .069
(1.346 – 1.752)
.014 – .019
(0.355 – 0.483)
TYP
.004 – .010
(0.101 – 0.254)
.050
(1.270)
BSC
1
N
234
N/2
.150 – .157
(3.810 – 3.988)
NOTE 3
8765
.189 – .197
(4.801 – 5.004)
NOTE 3
.228 – .244
(5.791 – 6.197)
.245
MIN
N
123 N/2
.160 ±.005
RECOMMENDED SOLDER PAD LAYOUT
.045 ±.005
.050 BSC
.030 ±.005
TYP
INCHES
(MILLIMETERS)
NOTE:
1. DIMENSIONS IN
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)
S16 (WIDE) 0502
NOTE 3
.398 – .413
(10.109 – 10.490)
NOTE 4
16 15 14 13 12 11 10 9
1
N
2345678
N/2
.394 – .419
(10.007 – 10.643)
.037 – .045
(0.940 – 1.143)
.004 – .012
(0.102 – 0.305)
.093 – .104
(2.362 – 2.642)
.050
(1.270)
BSC .014 – .019
(0.356 – 0.482)
TYP
0° – 8° TYP
NOTE 3
.009 – .013
(0.229 – 0.330)
.005
(0.127)
RAD MIN
.016 – .050
(0.406 – 1.270)
.291 – .299
(7.391 – 7.595)
NOTE 4
× 45°
.010 – .029
(0.254 – 0.737)
INCHES
(MILLIMETERS)
NOTE:
1. DIMENSIONS IN
2. DRAWING NOT TO SCALE
3. PIN 1 IDENT, NOTCH ON TOP AND CAVITIES ON THE BOTTOM OF PACKAGES ARE THE MANUFACTURING OPTIONS.
THE PART MAY BE SUPPLIED WITH OR WITHOUT ANY OF THE OPTIONS
4. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
.420
MIN
.325 ±.005
RECOMMENDED SOLDER PAD LAYOUT
.045 ±.005
N
123 N/2
.050 BSC
.030 ±.005
TYP