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LT2178 [Linear]

17uA Max, Dual and Quad, Single Supply, Precision Op Amps; 17uA最大，双路和四路，单电源，精密运算放大器
LT2178
型号： LT2178
厂家： Linear    Linear
描述：

17uA Max, Dual and Quad, Single Supply, Precision Op Amps
17uA最大，双路和四路，单电源，精密运算放大器

运算放大器
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LT2178/LT2179  
17µA Max, Dual and Quad,  
Single Supply, Precision Op Amps  
U
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. Bothdevicesareoptimizedforsinglesupplyopera-  
tion at 5V. Specifications are also provided at ±15V supply.  
■
SO Package with Standard Pinout  
■
Supply Current per Amplifier: 17µA Max  
■
Offset Voltage: 70µV Max  
Offset Current: 250pA Max  
Input Bias Current: 5nA Max  
■
■
■
Voltage Noise: 0.9µVP-P, 0.1Hz to 10Hz  
The extremely low supply current is combined with true  
precision specifications: offset voltage is 30µV and 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 the megohm  
level source resistors without introducing serious errors.  
Voltage noise, at 0.9µVP-P, is remarkably low considering  
the low supply current.  
■
Current Noise: 1.5pAP-P, 0.1Hz to 10Hz  
■
Offset Voltage Drift: 0.5µV/°C  
■
Gain Bandwidth Product: 85kHz  
■
Slew Rate: 0.04V/µs  
Single Supply Operation  
■
Input Voltage Range Includes Ground  
Output Swings to Ground while Sinking Current  
No Pull-Down Resistors Needed  
The LT2178/LT2179 can be operated from a single supply  
(as low as one lithium-cell or two NiCd batteries). The input  
rangegoesbelowground.Theall-NPNoutputstageswings  
towithinafewmillivoltsofgroundwhilesinkingcurrent.No  
power consuming pull down resistors are needed.  
■
Output Sources and Sinks 5mA Load Current  
U
APPLICATIONS  
■
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, slew rate, lower voltage noise and better  
output drive capability. For applications requiring DIP  
packages refer to the LT1178/LT1179.  
■
Micropower Sample-and-Hold  
■
Thermocouple Amplifier  
■
Micropower Filters  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
U
TYPICAL APPLICATION  
Self-Buffered, Dual Output, Micropower Reference  
Supply Current vs Temperature  
20  
TOTAL BATTERY CURRENT = 2µ8A  
OUTPUT ACCURACY =±0.4% MAX  
–
2
3
TEMPERATURE COEFFICIENT = 20ppm°/C  
LOAD REGULATION = 25ppm/mA, I≤ 5mA, V ≥ 5V  
LINE REGULATION = 10ppm/V  
0.1% FILM RESISTORS  
+
18  
16  
14  
12  
10  
L
1.2365V  
OUTPUT  
1
1/2 LT2178  
+
V
= ±15V  
S
*
4V TO 9V  
4
+
8
5
2.470V  
OUTPUT  
V
= 5V, 0V  
= ±1.5V  
50  
7
250k  
S
S
1/2 LT2178  
–
6
2M  
0.1µF  
0.1µF  
V
LT1004-1.2  
1M*  
1M*  
LT2178/79 • TA01  
–50  
–25  
25  
75  
100  
0
TEMPERATURE (°C)  
LT2178/79 • TPC02  
1
LT2178/LT2179  
W W U W  
ABSOLUTE MAXIMUM RATINGS  
Supply Voltage ...................................................... ±22V  
Differential Input Voltage ....................................... ±30V  
Input Voltage ...............Equal to Positive Supply Voltage  
............5V Below Negative Supply Voltage  
Specified Temperature Range  
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  
Output Short-Circuit Duration.......................... Indefinite  
U
W U  
PACKAGE/ORDER INFORMATION  
TOP VIEW  
ORDER PART  
ORDER PART  
NUMBER  
NUMBER  
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
LT2178ACS8  
LT2179ACS  
LT2179AIS  
LT2179CS  
LT2179IS  
+
OUT A  
–IN A  
+IN A  
1
2
3
4
8
7
6
5
V
LT2178AIS8  
LT2178CS8  
LT2178IS8  
+
–
+–A  
OUT B  
–IN B  
+IN B  
V
V
+
+
–
–
+
+IN B  
–IN B  
OUT B  
+IN C  
–IN C  
OUT C  
B
–B  
–
V
8
PART MARKING  
S8 PACKAGE  
8-LEAD PLASTIC SO  
S PACKAGE  
14-LEAD PLASTIC SO  
2178A  
2178AI 2178I  
2178  
TJMAX = 150°C, θJA = 190°C/ W  
TJMAX = 150°C, θJA = 150°C/ W  
Consult factory for Military grade parts.  
ELECTRICAL CHARACTERISTICS VS = 5V, 0V, VCM = 0.1V, VO = 1.4V, TA = 25°C, unless otherwise noted.  
LT2178AC/LT2178AI  
LT2179AC/LT2179AI  
LT2178C/LT2178I  
LT2179C/LT2179I  
SYMBOL PARAMETER  
CONDITIONS (NOTE 1)  
MIN  
TYP  
MAX  
MIN  
TYP  
MAX  
UNITS  
V
OS  
Input Offset Voltage  
LT2178  
LT2179  
30  
35  
70  
100  
40  
40  
120  
150  
µV  
µV  
∆V  
∆Time  
Long Term Input Offset  
Voltage Stability  
0.5  
0.6  
µV/Mo  
OS  
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
n
Input Noise Voltage  
Input Noise Voltage Density  
0.1Hz to 10Hz (Note 2)  
0.9  
2.0  
0.9  
µV  
P-P  
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  
2.0  
12  
0.6  
2.0  
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  
V
= 0V to 3.5V  
93  
94  
103  
104  
90  
92  
102  
104  
dB  
dB  
CM  
V = 2.2V to 12V  
S
2
LT2178/LT2179  
ELECTRICAL CHARACTERISTICS VS = 5V, 0V, VCM = 0.1V, VO = 1.4V, TA = 25°C, unless otherwise noted.  
LT2178AC/LT2178AI  
LT2179AC/LT2179AI  
LT2178C/LT2178I  
LT2179C/LT2179I  
SYMBOL PARAMETER  
CONDITIONS (NOTE 1)  
V = 0.03V to 4V, No Load (Note 3)  
MIN  
TYP  
MAX  
MIN  
TYP  
MAX  
UNITS  
A
Large-Signal Voltage Gain  
140  
80  
700  
200  
110  
70  
700  
200  
V/mV  
V/mV  
VOL  
O
V = 0.03V to 3.5V, R = 50k  
O
L
Maximum Output Voltage  
Swing  
Output Low, No Load  
6.5  
0.2  
120  
9
0.6  
160  
6.5  
0.2  
120  
9
0.6  
160  
mV  
mV  
mV  
Output Low, 2k to GND  
Output Low, I  
= 100µA  
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  
V
L
GBW  
Gain Bandwidth Product  
Supply Current per Amplifier  
f ≤ 5kHz  
O
kHz  
I
13  
12  
18  
17  
14  
13  
21  
20  
µA  
µA  
S
V = ±1.5V, V = 0V  
S
O
Channel Separation  
∆V = 3V, R = 10k  
110  
2.0  
110  
2.0  
dB  
V
IN  
L
Minimum Supply Voltage  
(Note 4)  
2.2  
2.2  
VS = 5V, 0V, VCM = 0.1V, VO = 1.4V, –40°C ≤ TA ≤ 85°C for I grades, unless otherwise noted. (Note 6)  
LT2178AI/LT2179AI  
LT2178I/LT2179I  
SYMBOL PARAMETER  
CONDITIONS  
MIN  
TYP  
MAX  
MIN  
TYP  
MAX  
UNITS  
V
OS  
Input Offset Voltage  
LT2178  
LT2179  
●
●
70  
80  
270  
300  
95  
100  
370  
400  
µV  
µV  
∆V  
∆T  
Input Offset Voltage Drift  
LT2178 (Note 5)  
LT2179  
●
0.4  
0.5  
1.8  
3.0  
0.5  
0.6  
2.5  
3.5  
µV/°C  
µV/°C  
OS  
I
I
Input Offset Current  
●
●
●
●
0.07  
3
0.70  
7
0.1  
4
1.0  
8
nA  
nA  
dB  
dB  
OS  
Input Bias Current  
B
CMRR  
PSRR  
Common Mode Rejection Ratio  
Power Supply Rejection Ratio  
Large-Signal Voltage Gain  
V
= 0.05V to 3.2V  
86  
88  
100  
100  
84  
86  
98  
100  
CM  
V = 3V to 12V  
S
A
V = 0.05V to 4V, No Load (Note 3)  
V = 0.05V to 3.5V, R = 50k  
●
●
75  
40  
350  
130  
50  
30  
350  
130  
V/mV  
V/mV  
VOL  
O
O
L
Maximum Output Voltage  
Swing  
Output Low, No Load  
●
●
9
160  
13  
220  
9
160  
13  
220  
mV  
mV  
Output Low, I  
= 100µA  
SINK  
Output High, No Load  
Output High, 2k to GND  
●
●
3.9  
3.0  
4.2  
3.7  
3.9  
3.0  
4.2  
3.7  
V
V
I
Supply Current per Amplifier  
●
15  
24  
15  
27  
µA  
S
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  
V
Input Offset Voltage  
LT2178  
LT2179  
●
●
50  
60  
170  
200  
65  
70  
250  
290  
µV  
µV  
OS  
∆V  
∆T  
Input Offset Voltage Drift  
LT2178 (Note 5)  
LT2179  
●
0.4  
0.5  
1.8  
3.0  
0.5  
0.6  
2.5  
3.5  
µV/°C  
µV/°C  
OS  
I
I
Input Offset Current  
●
●
●
●
0.06  
3
0.35  
6
0.06  
3
0.50  
7
nA  
nA  
dB  
dB  
OS  
B
Input Bias Current  
CMRR  
PSRR  
Common Mode Rejection Ratio  
Power Supply Rejection Ratio  
V
= 0V to 3.4V  
90  
90  
101  
102  
86  
88  
100  
102  
CM  
V = 2.5V to 12V  
S
3
LT2178/LT2179  
VS = 5V, 0V, VCM = 0.1V, VO = 1.4V, 0°C ≤ TA ≤ 70°C, unless otherwise noted.  
ELECTRICAL CHARACTERISTICS  
LT2178AC/LT2179AC  
LT2178C/LT2179C  
SYMBOL PARAMETER  
CONDITIONS  
V = 0.05V to 4V, No Load (Note 3)  
MIN  
TYP  
MAX  
MIN  
TYP  
MAX  
UNITS  
A
VOL  
Large-Signal Voltage Gain  
●
●
150  
55  
500  
160  
80  
45  
500  
160  
V/mV  
V/mV  
O
V = 0.05V to 3.5V, R = 50k  
O
L
Maximum Output Voltage  
Swing  
Output Low, No Load  
●
●
8
140  
11  
190  
8
140  
11  
190  
mV  
mV  
Output Low, I  
= 100µA  
SINK  
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
I
Supply Current per Amplifier  
●
14  
21  
15  
24  
µA  
S
VS = ±15V, TA = 25°C, unless otherwise noted.  
LT2178AC/LT2178AI  
LT2179AC/LT2179AI  
LT2178C/LT2178I  
LT2179C/LT2179I  
SYMBOL PARAMETER  
CONDITIONS  
MIN  
TYP  
MAX  
MIN  
TYP  
MAX  
UNITS  
V
OS  
Input Offset Voltage  
LT2178  
LT2179  
70  
80  
300  
350  
90  
100  
400  
450  
µV  
µV  
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  
–15.0  
13.9  
–15.3  
13.5  
–15.0  
13.9  
–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  
V = ±10V, R = 50k  
V = ±10V, No Load  
300  
600  
1200  
2500  
250  
400  
1000  
2500  
V/mV  
V/mV  
O
O
L
V
OUT  
Maximum Output Voltage  
Swing  
R = 50k  
L
±13.0  
±11.0  
±14.2  
±12.7  
±13.0  
±14.2  
V
V
L
R = 2k  
±11.0 ±12.7  
SR  
Slew Rate  
A = 1  
0.02  
0.04  
85  
0.02  
0.04  
85  
V/µs  
kHz  
µA  
V
GBW  
Gain Bandwidth Product  
Supply Current per Amplifier  
f ≤ 5kHz  
O
I
16  
21  
17  
25  
S
VS = ±15V, –40°C ≤ TA ≤ 85°C for I grades, unless otherwise noted.  
LT2178AI/LT2179AI  
LT2178I/LT2179I  
SYMBOL PARAMETER  
CONDITIONS  
MIN  
TYP  
MAX  
MIN  
TYP  
MAX  
UNITS  
V
OS  
Input Offset Voltage  
LT2178  
LT2179  
●
●
100  
100  
650  
650  
130  
130  
740  
740  
µV  
µV  
∆V  
∆T  
Input Offset Voltage Drift  
LT2178 (Note 5)  
LT2179  
●
0.6  
0.7  
1.8  
3.0  
0.7  
0.9  
2.5  
4.0  
µV/°C  
µV/°C  
OS  
I
I
Input Offset Current  
●
●
●
●
●
●
●
0.07  
3
0.70  
7
0.1  
4
1.0  
8
nA  
nA  
OS  
Input Bias Current  
B
A
Large-Signal Voltage Gain  
Common Mode Rejection Ratio  
Power Supply Rejection Ratio  
V = ±10V, R = 50k  
150  
90  
500  
105  
110  
±13.5  
18  
100  
88  
500  
103  
109  
±13.5  
19  
V/mV  
dB  
VOL  
O
L
CMRR  
PSRR  
V
= 13V, –14.9V  
CM  
V = 0V, 5V to ±18V  
S
92  
88  
dB  
Maximum Output Voltage Swing R = 5k  
±11.0  
±11.0  
V
L
I
Supply Current per Amplifier  
28  
30  
µA  
S
4
LT2178/LT2179  
VS = ±15V, 0°C ≤ TA ≤ 70°C, unless otherwise noted.  
ELECTRICAL CHARACTERISTICS  
LT2178AC/LT2179AC  
LT2178C/LT2179C  
SYMBOL PARAMETER  
CONDITIONS  
MIN  
TYP  
MAX  
MIN  
TYP  
MAX  
UNITS  
V
Input Offset Voltage  
LT2178  
LT2179  
●
●
100  
120  
480  
550  
130  
150  
660  
750  
µV  
µV  
OS  
∆V  
∆T  
Input Offset Voltage Drift  
LT2178 (Note 5)  
LT2179  
●
0.6  
0.7  
1.8  
3.0  
0.7  
0.9  
2.5  
4.0  
µV/°C  
µV/°C  
OS  
I
I
Input Offset Current  
●
●
●
●
●
●
●
0.06  
3
0.35  
6
0.06  
3
0.35  
7
nA  
nA  
OS  
B
Input Bias Current  
A
Large-Signal Voltage Gain  
Common Mode Rejection Ratio  
Power Supply Rejection Ratio  
V = ±10V, R = 50k  
200  
94  
800  
104  
110  
150  
91  
750  
104  
110  
V/mV  
dB  
VOL  
O
L
CMRR  
PSRR  
V
= 13V, –15V  
CM  
V = 5V, 0V to ±18V  
S
93  
91  
dB  
Maximum Output Voltage Swing R = 5k  
±11.0 ±13.6  
±11.0 ±13.6  
V
L
I
Supply Current per Amplifier  
17  
24  
18  
28  
µA  
S
The  
●
denotes specifications which apply over the full operating  
Note 4: 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 5: This parameter is not 100% tested.  
Note 6: During testing at –40°C, the 5V power supply turn-on time is less  
temperature range.  
Note 1: 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.  
than 0.5s.  
Note 2: This parameter is tested on a sample basis only. All noise  
Note 7: 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.  
parameters are tested with V = ±2.5V, V = 0V.  
S
O
Note 3: This parameter is guaranteed by design and is not tested.  
W
U
TYPICAL PERFORMANCE CHARACTERISTICS  
Distribution of Input  
Input Bias and Offset Currents vs  
Temperature  
Minimum Supply Voltage  
Offset Voltage  
100  
75  
100  
0
800  
600  
400  
200  
–
V
= 5V, 0V  
= 25°C  
V
S
= 5V, 0V  
S
A
V
= 0V  
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
50  
TEMPERATURE (°C)  
100  
–50 –25  
0
25  
75  
2
3
0
–150 –100 –50  
0
50  
100  
150  
OFFSET VOLTAGE (µV)  
POSITIVE SUPPLY VOLTAGE (V)  
LT2178/79 • TPC03  
LT2178/79 • TPC02  
LT2178/79 • TPC01  
5
LT2178/LT2179  
W
U
TYPICAL PERFORMANCE CHARACTERISTICS  
Output Saturation vs Temperature  
vs Sink Current  
Short-Circuit Current  
0.1Hz to 10Hz Noise  
1000  
100  
10  
20  
10  
V
S
= 5V, 0V  
T
A
= 25°C, V = ±2.5V  
S
I
= 1mA  
SINK  
V
= ±15V  
S
I
= 100µA  
SINK  
V
V
= ±2.5V  
= ±2.5V  
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
= ±15V  
S
CHANNEL B  
6
0.1  
–50  
–25  
0
25  
50  
75  
100  
0
2
1
0
4
8
10  
12  
2
TEMPERATURE (°C)  
TIME (SECONDS)  
TIME FROM OUTPUT SHORT TO GROUND (MINUTES)  
LT2178/79 • TPC04  
LT2178/79 • TPC05  
LTC2178/79 • TPC06  
Voltage Gain vs Frequency  
0.01Hz to 10Hz Noise  
Noise Spectrum  
1000  
140  
120  
100  
80  
T
= 25°C, V = ±2.5V  
S
A
T
= 25°C  
= ±2.5V  
A
S
T
= 25°C  
A
V
300  
100  
CURRENT  
NOISE  
V
= ±15V  
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 0.1  
0.1  
1
10  
100  
1000  
1
10 100 1k 10k 100k 1M  
0
40  
80  
100  
120  
20  
FREQUENCY (Hz)  
TIME (SECONDS)  
FREQUENCY (Hz)  
LT2178/79 • TPC08  
LT2178/79 • TPC09  
LTC2178/79 • TPC07  
Capacitive Load Handling  
Gain, Phase vs Frequency  
Voltage Gain vs Load Resistance  
10M  
1M  
120  
100  
80  
60  
40  
20  
0
30  
20  
10  
0
80  
V
S
= 5V, 0V  
T
= 25°C  
A
V
= ±15V, T = 25°C  
NO LOAD  
100  
120  
140  
160  
180  
200  
220  
240  
S
A
PHASE  
±15V  
PHASE  
5V, 0V,  
A
A
= 1  
= 5  
V
S
= 5V, 0V, T = 25°C  
V
A
100k  
10k  
GAIN  
5V, 0V  
V
S
= 5V, 0V, T = 85°C  
A
V
A
V
= 10  
GAIN  
±15V  
–10  
10k  
100k  
1M  
10M  
10  
100  
1000  
10000  
10k  
100k  
FREQUENCY (Hz)  
1M  
LOAD RESISTANCE TO GROUND (Ω)  
CAPACITIVE LOAD (pF)  
LT2178/79 • TPC11  
LT2078/79 • TPC12  
LT2178/79 • TPC10  
6
LT2178/LT2179  
W
U
TYPICAL PERFORMANCE CHARACTERISTICS  
Large-Signal Transient Response  
VS = ±15V  
Large-Signal Transient Response  
VS = 5V, 0V  
Small-Signal Transient Response  
VS = ±2.5V  
AV = 1  
L = 12pF  
500µs/DIV  
AV = 1  
L = 12pF  
INPUT PULSE = 0V TO 3.8V  
100µs/DIV  
AV = 1  
L = 12pF  
20µs/DIV  
C
LT2178/79 • TPC13  
C
C
LT2178/79 • TPC15  
LT2178/79 • TPC14  
Small-Signal Transient Response  
VS = ±15V  
Small-Signal Transient Response  
VS = 5V, 0V  
Common Mode Rejection Ratio  
vs Frequency  
120  
100  
80  
60  
40  
20  
0
T
= 25°C  
A
V
S
= ±15V  
V
= 5V, 0V  
S
AV = 1  
L = 12pF  
20µs/DIV  
AV = 1  
L = 12pF  
INPUT PULSE = 50mV TO 150mV  
20µs/DIV  
C
LT2178/79 • TPC16  
C
LT2178/79 • TPC17  
1
10  
100  
1k  
10k  
100k  
FREQUENCY (Hz)  
LT2178/79 • TPC18  
Power Supply Rejection Ratio  
vs Frequency  
Closed Loop Output Impedance  
120  
100  
80  
60  
40  
20  
0
T
= 25°C  
A
S
10k  
1k  
V
= 5V, 0V  
I
= 0  
L
POSITIVE  
SUPPLY  
A
= 100  
= 10  
CL  
NEGATIVE  
SUPPLY  
100  
10  
1
A
= 1  
CL  
A
CL  
T
= 25°C  
A
S
V
= ±2.5V + 1V SINE WAVE  
P-P  
10  
1k  
FREQUENCY (Hz)  
10k  
0.1  
10  
100  
1k  
10k 100k  
100  
100k  
1
OPERATING FREQUENCY (Hz)  
LT2178/79 • TPC20  
LT2178/79 • TPC19  
7
LT2178/LT2179  
W
W
SI PLIFIED 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  
IN  
Q31  
C3  
J1  
40pF  
Q18  
Q36  
Q28  
Q2  
Q22  
Q33  
Q48  
+
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  
3k  
6.2k  
–
V
LT2178/79 • SIMPLIFIED SCHEM  
8
LT2178/LT2179  
U
W U U  
APPLICATIONS INFORMATION  
Please see the LT2078/LT2079 data sheet for applications  
information.Allcommentsrelatingtospecifications,single  
supply operation and phase reversal protection are di-  
rectly 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  
2k  
–
0.01µF  
CLK  
RESET  
Q7  
CD4024  
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  
LT2178/79 • TA03  
9
LT2178/LT2179  
U
Dimensions in inches (millimeters) unless otherwise noted.  
PACKAGE DESCRIPTION  
S8 Package  
8-Lead Plastic Small Outline (Narrow 0.150)  
(LTC DWG # 05-08-1610)  
0.189 – 0.197*  
(4.801 – 5.004)  
7
5
8
6
0.150 – 0.157**  
(3.810 – 3.988)  
0.228 – 0.244  
(5.791 – 6.197)  
1
3
4
2
0.010 – 0.020  
(0.254 – 0.508)  
× 45°  
0.053 – 0.069  
(1.346 – 1.752)  
0.004 – 0.010  
(0.101 – 0.254)  
0.008 – 0.010  
(0.203 – 0.254)  
0°– 8° TYP  
0.016 – 0.050  
0.406 – 1.270  
0.050  
(1.270)  
BSC  
0.014 – 0.019  
(0.355 – 0.483)  
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH  
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE  
SO8 0695  
**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD  
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE  
10  
LT2178/LT2179  
U
Dimensions in inches (millimeters) unless otherwise noted.  
PACKAGE DESCRIPTION  
S Package  
14-Lead Plastic Small Outline (Narrow 0.150)  
(LTC DWG # 05-08-1610)  
0.337 – 0.344*  
(8.560 – 8.738)  
13  
12  
11 10  
8
14  
9
0.228 – 0.244  
(5.791 – 6.197)  
0.150 – 0.157**  
(3.810 – 3.988)  
1
2
3
4
5
6
7
0.010 – 0.020  
(0.254 – 0.508)  
× 45°  
0.053 – 0.069  
(1.346 – 1.752)  
0.004 – 0.010  
(0.101 – 0.254)  
0.008 – 0.010  
(0.203 – 0.254)  
0° – 8° TYP  
0.050  
(1.270)  
TYP  
0.014 – 0.019  
(0.355 – 0.483)  
0.016 – 0.050  
0.406 – 1.270  
S14 0695  
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH  
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE  
**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD  
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE  
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.  
11  
LT2178/LT2179  
TYPICAL APPLICATION  
U
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  
2178/79 TA04  
3.3V  
+
50k  
1µF  
10  
0
–10  
–20  
–30  
–40  
–50  
–60  
–70  
–80  
–90  
12-BIT ACCURATE SIGNAL RANGE FROM 6mV TO 1.8V ON 3.3V SINGLE SUPPLY.  
MAXIMUM OUTPUT OFFSET ERROR IS 448µV.  
FOR EACH 2ND ORDER SECTION:  
1
C1C2R1R2  
1
O
Q
W C2  
O
2
W
=
O
R1 =  
R2 =  
W QC1  
0.1  
1
10  
FREQUENCY (kHz)  
LT2178/79 • 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,  
0.07V/µs Slew Rate, Input/Output Common Mode Includes Ground  
OS  
Surface Mount Standard Pinout  
LT/GP 1196 7K • PRINTED IN USA  
Linear Technology Corporation  
1630 McCarthy Blvd., Milpitas, CA 95035-7417  
12  
●
●
(408) 432-1900 FAX: (408) 434-0507 TELEX: 499-3977  
LINEAR TECHNOLOGY CORPORATION 1996  

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