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LT1793 Low Noise, Picoampere Bias Current, JFET Input Op Amp
FEATURES
s s s s s s s s s
DESCRIPTIO
Input Bias Current, Warmed Up: 10pA Max 100% Tested Low Voltage Noise: 8nV/Hz Max A Grade 100% Temperature Tested Offset Voltage Over Temp: 1mV Max Input Resistance: 1013 Very Low Input Capacitance: 1.5pF Voltage Gain: 1 Million Min Gain-Bandwidth Product: 4.2MHz Typ Guaranteed Specifications with 5V Supplies
APPLICATIO S
s s s s
s s
Photocurrent Amplifiers Hydrophone Amplifiers High Sensitivity Piezoelectric Accelerometers Low Voltage and Current Noise Instrumentation Amplifier Front Ends Two and Three Op Amp Instrumentation Amplifiers Active Filters
, LTC and LT are registered trademarks of Linear Technology Corporation.
The LT(R)1793 achieves a new standard of excellence in noise performance for a JFET op amp. For the first time low voltage noise (6nV/Hz) is simultaneously offered with extremely low current noise (0.8fA/Hz), providing the lowest total noise for high impedance transducer applications. Unlike most JFET op amps, the very low input bias current (3pA typ) is maintained over the entire common mode range which results in an extremely high input resistance (1013). When combined with a very low input capacitance (1.5pF) an extremely high input impedance results, making the LT1793 the first choice for amplifying low level signals from high impedance transducers. The low input capacitance also assures high gain linearity when buffering AC signals from high impedance transducers. The LT1793 is unconditionally stable for gains of 1 or more, even with 1000pF capacitive loads. Other key features are 250V VOS and a voltage gain over 4 million. Each individual amplifier is 100% tested for voltage noise, slew rate (3.4V/s) and gain-bandwidth product (4.2MHz). Specifications at 5V supply operation are also provided. For an even lower voltage noise please see the LT1792 data sheet.
TYPICAL APPLICATIO
Low Noise Light Sensor with DC Servo
C1 2pF
TOTAL 1kHz VOLTAGE NOISE DENSITY (nV/Hz)
10k
V+
R3 1k LT1097
2N3904 HAMAMATSU S1336-5BK (908) 231-0960 V- R5 10k R4 1k
1793 TA01 V- R2C2 > C1R1 CD = PARASITIC PHOTODIODE CAPACITANCE VOUT = 100mV/WATT FOR 200nm WAVE LENGTH 330mV/WATT FOR 633nm WAVE LENGTH
-
CD
D1 1N914
+
+
D2 1N914
3
-
2
7 LT1793 4 V- V+ 6
R1 1M VOUT
1k
C2 0.022F
100
R2 100k
10
1 100
U
1kHz Output Voltage Noise Density vs Source Resistance
- +
RSOURCE VN
U
U
VN SOURCE RESISTANCE ONLY 1k TA = 25C VS = 15V
10k 100k 1M 10M 100M 1G SOURCE RESISTANCE ()
VN = (VOP AMP)2 + 4kTRS + 2qIBRS2
1793 TA02
1
LT1793 ABSOLUTE AXI U RATI GS
Supply Voltage ..................................................... 20V Differential Input Voltage ...................................... 40V Input Voltage (Equal to Supply Voltage) ............... 20V Output Short-Circuit Duration ........................ Indefinite Operating Temperature Range ............... - 40C to 85C
PACKAGE/ORDER I FOR ATIO
TOP VIEW VOS ADJ 1 - IN A 2 + IN A 3 V
-
ORDER PART NUMBER
8 NC 7V
+
A
6 OUT 5 VOS ADJ N8 PACKAGE 8-LEAD PDIP
4
LT1793ACN8 LT1793CN8 LT1793AIN8 LT1793IN8
TJMAX = 150C, JA = 80C/W
Consult factory for Military grade parts.
ELECTRICAL CHARACTERISTICS
SYMBOL VOS IOS IB en PARAMETER Input Offset Voltage VS = 5V Input Offset Current Input Bias Current Input Noise Voltage Input Noise Voltage Density in RIN Input Noise Current Density Input Resistance Differential Mode Common Mode Input Capacitance VS = 5V Input Voltage Range (Note 5) Common Mode Rejection Ratio Power Supply Rejection Ratio VCM = -10V to 13V
TA = 25C, VS = 15V, VCM = 0V, unless otherwise noted.
LT1793AC/LT1793AI MIN TYP MAX 0.25 0.45 1.5 0.5 3 1 2.4 11.5 6 0.8 1014 1013 1.5 2.0 13.0 - 10.5 83 85 13.5 - 11.0 102 98 13.0 - 10.5 81 83 8 0.8 1.4 7 2 10 3 LT1793C/LT1793I MIN TYP MAX 0.25 0.45 2.5 0.7 4.0 1.5 2.4 11.5 6 1 1014 1013 1.5 2.0 13.5 - 11.0 96 95 8 0.9 1.6 15 4 20 5 UNITS mV mV pA pA pA pA VP-P nV/Hz nV/Hz fA/Hz pF pF V V dB dB
CONDITIONS (Note 2)
Warmed Up (Note 3) TJ = 25C (Note 6) Warmed Up (Note 3) TJ = 25C (Note 6) 0.1Hz to 10Hz fO = 10Hz fO = 1000Hz fO = 10Hz, fO = 1kHz (Note 4)
VCM = -10V to 13V
CIN VCM CMRR PSRR
VS = 4.5V to 20V
2
U
U
W
WW U
W
(Note 1)
Specified Temperature Range Commercial (Note 8) ......................... - 40C to 85C Industrial ........................................... - 40C to 85C Storage Temperature Range ................ - 65C to 150C Lead Temperature (Soldering, 10 sec) ................ 300C
TOP VIEW VOS ADJ 1 -IN A 2 +IN A 3 V- 4
A
ORDER PART NUMBER
8 NC 7 V+ 6 OUT 5 VOS ADJ
LT1793ACS8 LT1793CS8 LT1793AIS8 LT1793IS8 S8 PART MARKING 1793A 1793 1793AI 1793I
S8 PACKAGE 8-LEAD PLASTIC SO TJMAX = 160C, JA = 190C/W
LT1793
ELECTRICAL CHARACTERISTICS
SYMBOL AVOL VOUT SR GBW IS PARAMETER Large-Signal Voltage Gain Output Voltage Swing Slew Rate Gain-Bandwidth Product Supply Current VS = 5V Offset Voltage Adjustment Range
TA = 25C, VS = 15V, VCM = 0V, unless otherwise noted.
LT1793AC/LT1793AI MIN TYP MAX 1000 500 13.0 12.0 2.3 2.5 4500 3500 13.2 12.3 3.4 4.2 4.2 4.2 13 5.20 5.15 LT1793C/LT1793I MIN TYP MAX 900 400 13.0 12.0 2.3 2.5 4400 3000 13.2 12.3 3.4 4.2 4.2 4.2 13 5.20 5.15 UNITS V/mV V/mV V V V/s MHz mA mA mV
CONDITIONS (Note 2) VO = 12V, RL = 10k VO = 10V, RL = 1k RL = 10k RL = 1k RL 2k (Note 7) fO = 100kHz
RPOT (to VEE) = 10k
The q denotes specifications which apply over the temperature range 0C TA 70C, otherwise specifications are at TA = 25C. VS = 15V, VCM = 0V, unless otherwise noted. (Note 9)
SYMBOL VOS VOS Temp IOS IB VCM CMRR PSRR AVOL VOUT SR GBW IS PARAMETER Input Offset Voltage VS = 5V Average Input Offset Voltage Drift Input Offset Current Input Bias Current Input Voltage Range (Note 5) Common Mode Rejection Ratio Power Supply Rejection Ratio Large-Signal Voltage Gain Output Voltage Swing Slew Rate Gain-Bandwidth Product Supply Current VS = 5V VCM = -10V to 12.9V VS = 4.5V to 20V VO = 12V, RL = 10k VO = 10V, RL = 1k RL = 10k RL = 1k RL 2k (Note 7) fO = 100kHz (Note 6) CONDITIONS (Note 2)
q q q q q q q q q q q q q q q q q
MIN
LT1793AC TYP MAX 0.50 0.75 5 15 130 1.0 1.6 13 100 400
MIN
LT1793C TYP MAX 1.0 1.6 8 20 150 3.5 4.2 50 130 500
UNITS mV mV V/C pA pA V V dB dB V/mV V/mV V V V/s MHz
12.9 - 10.0 79 83 900 500
13.4 - 10.8 100 97 3600 2600
12.9 - 10.0 77 81 800 400
13.4 - 10.8 95 94 3400 2400
12.9 13.2 11.9 12.15 2.2 2.2 3.3 3.3 4.2 4.2 5.30 5.25
12.9 13.2 11.9 12.15 2.2 2.2 3.3 3.3 4.2 4.2 5.30 5.25
mA mA
3
LT1793
The q denotes specifications which apply over the temperature range - 40C TA 85C. VS = 15V, VCM = 0V, unless otherwise noted. (Notes 8, 9)
SYMBOL VOS VOS Temp IOS IB VCM CMRR PSRR AVOL VOUT SR GBW IS PARAMETER Input Offset Voltage VS = 5V Average Input Offset Voltage Drift Input Offset Current Input Bias Current Input Voltage Range (Note 5) Common Mode Rejection Ratio Power Supply Rejection Ratio Large-Signal Voltage Gain Output Voltage Swing Slew Rate Gain-Bandwidth Product Supply Current VS = 5V VCM = -10V to 12.6V VS = 4.5V to 20V VO = 12V, RL = 10k VO = 10V, RL = 1k RL = 10k RL = 1k RL 2k fO = 100kHz (Note 6) CONDITIONS (Note 2)
q q q q q q q q q q q q q q q q q
ELECTRICAL CHARACTERISTICS
LT1793AC/LT1793AI MIN TYP MAX 0.65 1.00 5 80 700 12.6 - 10.0 78 81 850 400 12.8 11.8 2.1 2 13.0 - 10.5 99 96 3300 2200 13.1 12.1 3.2 3.1 4.2 4.2 5.40 5.35 1.3 1.9 13 300 2400
LT1793C/LT1793I MIN TYP MAX 1.6 2.0 9 100 800 12.6 - 10.0 76 79 750 300 12.8 11.8 2.1 2 13.0 - 10.5 94 93 3000 2000 13.1 12.1 3.2 3.1 4.2 4.2 5.40 5.35 4.8 5.5 50 400 3000
UNITS mV mV V/C pA pA V V dB dB V/mV V/mV V V V/s MHz mA mA
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. Note 3: IB and IOS readings are extrapolated to a warmed-up temperature from 25C measurements and 32C characterization data. Note 4: Current noise is calculated from the formula: in = (2qIB)1/2 where q = 1.6 * 10 -19 coulomb. The noise of source resistors up to 200M swamps the contribution of current noise. Note 5: Input voltage range functionality is assured by testing offset voltage at the input voltage range limits to a maximum of 2.3mV (A grade) to 2.8mV (C grade).
Note 6: This parameter is not 100% tested. Note 7: Slew rate is measured in AV = -1; input signal is 7.5V, output measured at 2.5V. Note 8: The LT1793AC and LT1793C are guaranteed to meet specified performance from 0C to 70C and are designed, characterized and expected to meet these extended temperature limits, but are not tested at - 40C and 85C. The LT1793I is guaranteed to meet the extended temperature limits. The LT1793AC and LT1793AI grade are 100% temperature tested for the specified temperature range. Note 9: The LT1793 is measured in an automated tester in less than one second after application of power. Depending on the package used, power dissipation, heat sinking, and air flow conditions, the fully warmed-up chip temperature can be 10C to 50C higher than the ambient temperature.
4
LT1793
TYPICAL PERFOR A CE CHARACTERISTICS
0.1Hz to 10Hz Voltage Noise
50
RMS VOLTAGE NOISE DENSITY (nV/Hz)
VOLTAGE NOISE (1V/DIV)
PERCENT OF UNITS (%)
0
2
4 6 TIME (SEC)
Voltage Noise vs Chip Temperature
10
V+ 0 -0.5
9
COMMON MODE LIMIT (V) REFERRED TO POWER SUPPLY
-1.0 -1.5 -2.0
V = 5V TO 20V
+
COMMON MODE REJECTION RATIO (dB)
VOLTAGE NOISE (AT 1kHz) (nV/Hz)
VS = 15V
8 7 6 5 4 3 2 -75 -50 -25 0 25 50 75 TEMPERATURE (C) 100 125
1793 G04
Power Supply Rejection Ratio vs Frequency
120 POWER SUPPLY REJECTION RATIO (dB) TA = 25C 100 +PSRR
VOLTAGE GAIN (dB)
180 160 140 120 100 80 60 40 20 0
VOLTAGE GAIN (dB)
80 -PSRR 60 40 20 0
10
100
1k 10k 100k FREQUENCY (Hz)
UW
8 10
1793 G01
1kHz Input Noise Voltage Distribution
100
TA = 25C VS = 15V 510 OP AMPS TESTED
Voltage Noise vs Frequency
TA = 25C VS = 15V
40
30
10 1/f CORNER 30Hz
20
10
0 4.2 4.6 5.0 5.4 5.8 6.2 6.6 7.0 7.4 7.8 8.2 INPUT VOLTAGE NOISE (nV/Hz)
1793 G02
1 1 10 100 1k FREQUENCY (Hz) 10k
1793 G03
Common Mode Limit vs Temperature
120 100 80 60 40 20 0
-20 60 100 20 TEMPERATURE (C) 140
1793 G05
Common Mode Rejection Ratio vs Frequency
TA = 25C VS = 15V
4.0 3.5 3.0 2.5 V - = - 5V TO - 20V
V - +2.0 -60
1k
10k
100k 1M FREQUENCY (Hz)
10M
1793 G06
Voltage Gain vs Frequency
TA = 25C VS = 15V CL = 10pF
Gain and Phase Shift vs Frequency
50 40 30 PHASE 20 10 GAIN 0 -10 180 200 100
1793 G09
TA = 25C VS = 15V CL = 10pF
80 100
PHASE SHIFT (DEG)
120 140 160
1M
10M
1793 G07
- 20 0.01
1
10k 100 FREQUENCY (Hz)
1M
100M
1793 G08
0.1
1 10 FREQUENCY (MHz)
5
LT1793
TYPICAL PERFOR A CE CHARACTERISTICS
Small-Signal Transient Response Large-Signal Transient Response
V + -0.8 -1.0 OUTPUT VOLTAGE SWING (V) -1.2 -1.4 -1.6 2.0 1.8 1.6 1.4 1.2 V - +1.0 -10 -8 -6 -4 -2 0 2 4 6 8 10 ISINK ISOURCE OUTPUT CURRENT (mA)
1793 G12
20mV/DIV
5V/DIV
AV = 1 CL = 10pF VS = 15V, 5V
1s/DIV
Capacitive Load Handling
50
CHANGE IN OFFSET VOLTAGE (V)
TOTAL HARMONIC DISTORTION + NOISE (%)
40
OVERSHOOT (%)
30
VS = 15V TA = 25C RL 10k VO = 100mVP-P AV = 10 RF = 10k CF = 20pF
20 AV = 1 10 AV = 10 0 0.1
1
100 1000 10 CAPACITIVE LOAD (pF)
THD and Noise vs Frequency for Inverting Gain
TOTAL HARMONIC DISTORTION + NOISE (%)
TOTAL HARMONIC DISTORTION + NOISE (%)
1 ZL = 2k 15pF VO = 20VP-P AV = - 1, - 10, - 100 MEASUREMENT BANDWIDTH = 10Hz TO 80kHz AV = - 100 0.01 AV = - 10 0.001 NOISE FLOOR 20 100 1k FREQUENCY (Hz) 10k 20k
1793 G16
0.1
0.1
ZL = 2k 15pF, fO = 1kHz AV = -1, -10, -100 MEASUREMENT BANDWIDTH = 10Hz TO 22kHz
TOTAL HARMONIC DISTORTION + NOISE (%)
0.0001
6
UW
1793 G10
Output Voltage Swing vs Load Current
25C -55C 125C
VS = 5V TO 20V
125C -55C 25C
AV = 1 CL = 10pF RL = 2k VS = 15V
5s/DIV
1793 G11
Warm-Up Drift
90 75 60 45 N8 PACKAGE 30 15 0 VS = 15V TA = 25C SO-8 PACKAGE 1
THD and Noise Frequency for Noninverting Gain
ZL = 2k 15pF VO = 20VP-P AV = 1, 10, 100 MEASUREMENT BANDWIDTH = 10Hz TO 80kHz AV = 100
0.1
0.01
AV = 10 0.001
AV = 1 NOISE FLOOR
0.0001 20 100 1k FREQUENCY (Hz) 10k 20k
1793 G15
10000
1793 G13
0
5 2 3 4 1 TIME AFTER POWER ON (MINUTES)
6
1793 G14
THD and Noise vs Output Amplitude for Inverting Gain
1 1
THD and Noise vs Output Amplitude for Noninverting Gain
ZL = 2k 15pF, fO = 1kHz AV = 1, 10, 100 MEASUREMENT BANDWIDTH = 10Hz TO 22kHz
0.1
AV = -100 0.01 AV = -10 0.001 AV = -1
AV = 100 0.01 AV = 10 0.001 AV = 1
AV = - 1
0.0001 0.3 1 10 OUTPUT SWING (VP-P) 30
1793 G17
0.0001 0.3 1 10 OUTPUT SWING (VP-P) 30
1793 G18
LT1793
TYPICAL PERFOR A CE CHARACTERISTICS
Short-Circuit Output Current vs Temperature
40 35
OUTPUT CURRENT (mA)
SUPPLY CURRENT PER AMPLIFIER (mA)
INPUT BIAS AND OFFSET CURRENTS (A)
VS = 15V
30 SINK 25 20 15 10 - 75 - 50 - 25 0 25 50 75 TEMPERATURE (C) SOURCE
APPLICATI
S I FOR ATIO
LT1793 vs the Competition With improved noise performance, the LT1793 in the PDIP directly replaces such JFET op amps as the OPA111 and the AD645. The combination of low current and voltage noise of the LT1793 allows it to surpass most dual and single JFET op amps. The LT1793 can replace many of the lowest noise bipolar amps that are used in amplifying low level signals from high impedance transducers. The best bipolar op amps (with higher current noise) will eventually lose out to the LT1793 when transducer impedance increases.
100 80 INPUT BIAS CURRENT (pA) 60 40 20 0 AD822 OP215 LT1793 CURRENT NOISE = 2qIB
6 5 1 50k - 15V
-40 -60 -80
VOS = 13mV
-100 -15
-10 0 5 10 -5 COMMON MODE RANGE (V)
15
1793 F01
Figure 1. Comparison of LT1793, OP215, and AD822 Input Bias Current vs Common Mode Range
(a)
Figure 2
+
+
-20
3
4
3
-
-
U
W
UW
1793 G19
Supply Current vs Temperature
5
30n 10n 3n 1n 300p 100p 30p 10p 3p 1p 0.3p
Input Bias and Offset Currents vs Chip Temperature
VS = 15V VCM = -10 TO 13V
VS = 15V 4 VS = 5V
BIAS CURRENT
OFFSET CURRENT
100 125
3 - 75 - 50 - 25 0 25 50 75 TEMPERATURE (C)
100 125
1793 G20
0
25
75 100 50 TEMPERATURE (C)
125
1793 G21
U
UO
The extremely high input impedance (1013) assures that the input bias current is almost constant over the entire common mode range. Figure 1 shows how the LT1793 stands up to the competition. Unlike the competition, as the input voltage is swept across the entire common mode range the input bias current of the LT1793 hardly changes. As a result the current noise does not degrade. This makes the LT1793 the best choice in applications where an amplifier has to buffer signals from a high impedance transducer. Offset nulling will be compatible with these devices with the wiper of the potentiometer tied to the negative supply (Figure 2a). No appreciable change in offset voltage drift
15V 2 7 2 15V 7 6 4 5 1 10k 10k VOS = 1.3mV
50k - 15V
1793 F02
(b)
7
LT1793
APPLICATI S I FOR ATIO
with temperature will occur when the device is nulled with a potentiometer ranging from 10k to 200k. Finer adjustments can be made with resistors in series with the potentiometer (Figure 2b). Amplifying Signals from High Impedance Transducers The low voltage and current noise offered by the LT1793 makes it useful in a wide range of applications, especially where high impedance, capacitive transducers are used such as hydrophones, precision accelerometers and photodiodes. The total output noise in such a system is the gain times the RMS sum of the op amp's input referred
10k
CS
LT1007*
RS VO CS
INPUT NOISE VOLTAGE (nV/Hz)
1k
LT1793*
100
RS
LT1007 LT1793 10 LT1793 LT1007 RESISTOR NOISE ONLY 1k 10k 100k 1M 10M 100M SOURCE RESISTANCE () 1G
1 100
1793 F03
SOURCE RESISTANCE = 2RS = R * PLUS RESISTOR PLUS RESISTOR 1000pF CAPACITOR Vn = AV Vn2(OP AMP) + 4kTR + 2qIBR2
Figure 3. Comparison of LT1793 and LT1007 Total Output 1kHz Voltage Noise vs Source Resistance
RF CF
CS
RS
OUTPUT
R1
TRANSDUCER RB
CB
CB = CF CS RB = RF RS dQ dV Q = CV; = I = C dt dt
CS
RS
TRANSDUCER
Figure 4. Inverting and Noninverting Gain Configurations
8
+
-
U
voltage noise, the thermal noise of the transducer, and the op amp's input bias current noise times the transducer impedance. Figure 3 shows total input voltage noise versus source resistance. In a low source resistance (< 5k) application the op amp voltage noise will dominate the total noise. This means the LT1793 is superior to most JFET op amps. Only the lowest noise bipolar op amps have the advantage at low source resistances. As the source resistance increases from 5k to 50k, the LT1793 will match the best bipolar op amps for noise performance, since the thermal noise of the transducer (4kTR) begins to dominate the total noise. A further increase in source resistance, above 50k, is where the op amp's current noise component (2qIBR2) will eventually dominate the total noise. At these high source resistances, the LT1793 will out perform the lowest noise bipolar op amps due to the inherently low current noise of FET input op amps. Clearly, the LT1793 will extend the range of high impedance transducers that can be used for high signal-to-noise ratios. This makes the LT1793 the best choice for high impedance, capacitive transducers. Optimization Techniques for Charge Amplifiers The high input impedance JFET front end makes the LT1793 suitable in applications where very high charge sensitivity is required. Figure 4 illustrates the LT1793 in its inverting and noninverting modes of operation. A charge amplifier is shown in the inverting mode example; the gain depends on the principal of charge conservation at the input of the LT1793. The charge across the transducer capacitance CS is transferred to the feedback capacitor CF
R2 CB RB OUTPUT CB CS RB = RS RS > R1 OR R2
1793 F04
W
+ -
U
UO
+
-
LT1793
APPLICATI S I FOR ATIO
resulting in a change in voltage dV, which is equal to dQ/CF. The gain therefore is CF/CS. For unity-gain, the CF should equal the transducer capacitance plus the input capacitance of the LT1793 and RF should equal RS. In the noninverting mode example, the transducer current is converted to a change in voltage by the transducer capacitance, CS. This voltage is then buffered by the LT1793 with a gain of 1 + R1/R2. A DC path is provided by RS, which is either the transducer impedance or an external resistor. Since RS is usually several orders of magnitude greater than the parallel combination of R1 and R2, R B is added to balance the DC offset caused by the noninverting input bias current and RS. The input bias currents, although small at room temperature, can create significant errors at higher temperature, especially with transducer resistances of up to 1000M or more. The optimum value
Input: 5.2V Sine Wave
LT1793 F05a
Figure 5. Voltage Follower with Input Exceeding the Common Mode Range (VS = 5V)
U
for RB is determined by equating the thermal noise (4kTRS) to the current noise (2qIB) times RS2. Solving for RS results in RB = RS = 2VT/IB (VT = 26mV at 25C). A parallel capacitor CB, is used to cancel the phase shift caused by the op amp input capacitance and RB. Reduced Power Supply Operation To take full advantage of a wide input common mode range, the LT1793 was designed to eliminate phase reversal. Referring to the photographs in Figure 5, the LT1793 is shown operating in the follower mode (AV = 1) at 5V supplies with the input swinging 5.2V. The output of the LT1793 clips cleanly and recovers with no phase reversal. This has the benefit of preventing lockup in servo systems and minimizing distortion components.
LT1793 Output
LT1793 F05b
W
U
UO
9
LT1793
PACKAGE DESCRIPTIO
0.300 - 0.325 (7.620 - 8.255)
0.009 - 0.015 (0.229 - 0.381)
(
+0.035 0.325 -0.015 8.255 +0.889 -0.381
)
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)
10
U
Dimensions in inches (millimeters) unless otherwise noted.
N8 Package 8-Lead PDIP (Narrow 0.300)
(LTC DWG # 05-08-1510)
0.400* (10.160) MAX 8 7 6 5
0.255 0.015* (6.477 0.381)
1
2
3
4 0.130 0.005 (3.302 0.127)
0.045 - 0.065 (1.143 - 1.651)
0.065 (1.651) TYP 0.125 (3.175) 0.020 MIN (0.508) MIN 0.018 0.003 (0.457 0.076) N8 1197
0.100 0.010 (2.540 0.254)
LT1793
PACKAGE DESCRIPTIO U
Dimensions in inches (millimeters) unless otherwise noted.
S8 Package 8-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
0.189 - 0.197* (4.801 - 5.004) 8 7 6 5
0.228 - 0.244 (5.791 - 6.197)
0.150 - 0.157** (3.810 - 3.988)
1 0.010 - 0.020 x 45 (0.254 - 0.508) 0.008 - 0.010 (0.203 - 0.254) 0- 8 TYP 0.053 - 0.069 (1.346 - 1.752)
2
3
4
0.004 - 0.010 (0.101 - 0.254)
0.016 - 0.050 0.406 - 1.270
0.014 - 0.019 (0.355 - 0.483)
0.050 (1.270) TYP
*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
SO8 0996
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 representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
11
LT1793
TYPICAL APPLICATIONS N
10Hz Fourth Order Chebyshev Lowpass Filter (0.01dB Ripple)
R2 237k
VIN C2 100nF
LT1793
-15V
TYPICAL OFFSET 0.8mV 1% TOLERANCES FOR VIN = 10VP-P, VOUT = -121dB AT f > 330Hz = - 6dB AT f = 16.3Hz LOWER RESISTOR VALUES WILL RESULT IN LOWER THERMAL NOISE AND LARGER CAPACITORS
Accelerometer Amplifier with DC Servo
C1 1250pF R1 100M R3 2k C2 2F R4 20M R5 20M C3 2F 6
1793 TA03
R2 18k
2
1 5V TO 15V
1/2 LT1464 3
RELATED PARTS
PART NUMBER LT1113 LT1169 LT1467 LT1792 DESCRIPTION Low Noise, Dual JFET Op Amp Low Noise, Dual JFET Op Amp Micropower Dual JFET Op Amp Low Noise, Single JFET Op Amp COMMENTS Dual Version of LT1792, VNOISE = 4.5nV/Hz Dual Version of LT1793, VNOISE = 6nV/Hz, IB = 10pA 1MHz, 2pA Max IB, 200A Max IS Lower VNOISE Version of LT1793, VNOISE = 4.2nV/Hz
1793f LT/TP 0599 4K * PRINTED IN USA
12
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408)432-1900 q FAX: (408) 434-0507 q www.linear-tech.com
+
3
-
ACCELEROMETER B & K MODEL 4381 OR EQUIVALENT (800) 442-1030
2
7
LT1793 4
-5V TO -15V
R4C2 = R5C3 > R1 (1 + R2/R3) C1 OUTPUT = 0.8mV/pC* = 8.0mV/g** DC OUTPUT 1.9mV OUTPUT NOISE = 8nV/H AT 1kHz z *PICOCOULOMBS **g = EARTH'S GRAVITATIONAL CONSTANT
+
-
+
+
3
4
C4 330nF
3
-
-
R1 237k
U
R5 154k 15V 2 7 C1 33nF 6
R3 249k
R4 154k
R6 249k
2
C3 10nF LT1793 6 VOUT
1793 TA04
OUTPUT
(c) LINEAR TECHNOLOGY CORPORATION 1999

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