Battery or Solar Powered Systems:
Portable Instrumentation
Sensor Conditioning
■
Supply Current Sensing
■
Battery Monitoring
■
MUX Amplifiers
■
4mA to 25mA Transmitters
The LT®1637 is a rugged op amp that operates on all single
and split supplies with a total voltage of 2.7V to 44V. The
LT1637 has a gain-bandwidth product of 1.1MHz while
drawing less than 250µA of quiescent current. The LT1637
can be shut down, making the output high impedance and
reducing the quiescent current to only 3µA. The LT1637 is
reverse supply protected: it draws virtually no current for
reverse supply up to 25V. The input range of the LT1637
includes both supplies and the output swings to both
supplies. Unlike most micropower op amps, the LT1637
can drive heavy loads; its rail-to-rail output drives 25mA.
The LT1637 is unity-gain stable into all capacitive loads up
to 4700pF when optional 0.22µF and 150Ω compensation
is used.
The LT1637 has a unique input stage that operates 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 22V. There is no phase reversal of the output for inputs
5V below VEE or 44V above VEE, independent of VCC.
The LT1637 op amp is available in the 8-pin MSOP, PDIP
and SO packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Over-The-Top is a trademark of Linear Technology Corporation.
TYPICAL APPLICATIO
Switchable Precision Current SourceCurrent Source Timing
+
R*
SHDN
LT1004-1.24.7µF
2k
+
LT1637
–
*OPTIONAL FOR LOW OUTPUT CURRENTS,
R* = R
U
Over-The-TopTM Current Source with Shutdown
I
OUT
R
TP0610
4V TO 44V
1.2
=
I
OUT
R
e.g., 10mA = 120Ω
1637 TA01
V
SHDN
I
OUT
6V
4V
2V
0V
10mA
5mA
0mA
100µs/DIV1637 TA01b
1
Page 2
LT1637
1
2
3
4
8
7
6
5
TOP VIEW
NULL
V
+
OUT
SHDN
NULL
–
IN
+
IN
V
–
S8 PACKAGE
8-LEAD PLASTIC SO
N8 PACKAGE
8-LEAD PDIP
1
2
3
4
NULL
–
IN
+
IN
V
–
8
7
6
5
NULL
V
+
OUT
SHDN
TOP VIEW
MS8 PACKAGE
8-LEAD PLASTIC MSOP
WW
W
U
ABSOLUTE AXIU RATIGS
(Note 1)
Total Supply Voltage (V+ to V–) .............................. 44V
Input Differential Voltage ......................................... 44V
Input Current ...................................................... ±25mA
Shutdown Pin Voltage Above V
–
.....................................
32V
Shutdown Pin Current ........................................ ±10mA
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
ORDER PART
NUMBER
LT1637CN8
LT1637CS8
LT1637IN8
LT1637IS8
T
= 150°C, θJA = 130°C/W (N8)
JMAX
= 150°C, θJA = 190°C/W (S8)
T
JMAX
S8 PART
MARKING
LTIE
1637
1637I
Consult factory for Military grade parts.
3V5VAUDELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the specified temperature range, otherwise specifications are at TA = 25°C.
VS = 3V, 0V; VS = 5V, 0V; V
SYMBOLPARAMETERCONDITIONSMINTYPMAXUNITS
V
OS
I
OS
I
B
e
n
i
n
2
Input Offset VoltageN8, S8 Packages100350µV
Input Offset Voltage Drift (Note 9)N8, S8 Packages, – 40°C ≤ TA ≤ 85°C●13µV/°C
Input Offset Current●0.46.0nA
Input Bias Current●2050nA
Input Noise Voltage0.1Hz to 10Hz0.6µV
Input Noise Voltage Densityf = 1kHz27nV/√Hz
Input Noise Current Densityf = 1kHz0.08pA/√Hz
The ● denotes the specifications which apply over the specified temperature range, otherwise specifications are at TA = 25°C.
VS = 3V, 0V; VS = 5V, 0V; V
SYMBOLPARAMETERCONDITIONSMINTYPMAXUNITS
R
IN
C
IN
CMRRCommon Mode Rejection RatioVCM = 0V to (VCC – 1V)●88110dB
A
VOL
V
OL
V
OH
I
SC
PSRRPower Supply Rejection RatioVS = 3V to 12.5V, VCM = VO = 1V●9098dB
I
S
I
SHDN
t
ON
t
OFF
t
SETTLING
GBWGain-Bandwidth Productf = 10kHz6501000kHz
SRSlew RateAV = – 1, R
Input ResistanceDifferential12.6MΩ
Input Capacitance4pF
Input Voltage Range●044V
(Note 5)V
Large-Signal Voltage GainVS = 3V, VO = 500mV to 2.5V, RL = 10k150400V/mV
Output Voltage Swing LOWNo Load●38 mV
Output Voltage Swing HIGHVS = 3V, No Load●2.942.975V
Short-Circuit Current (Note 2)VS = 3V, Short Output to Ground1014mA
The ● denotes the specifications which apply over the specified temperature range, otherwise specifications are at TA = 25°C.
V
= ±15V, V
S
SYMBOLPARAMETERCONDITIONSMINTYPMAXUNITS
GBWGain-Bandwidth Productf = 10kHz7501100kHz
SRSlew RateAV = – 1, R
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: A heat sink may be required to keep the junction temperature
below absolute maximum.
Note 3: The LT1637 is guaranteed functional over the operating
temperature range of – 40°C to 85°C.
Note 4: The LT1637C is guaranteed to meet specified performance from
0°C to 70°C. The LT1637C is designed, characterized and expected to
meet specified performance from –40°C to 85°C but is not tested or QA
sampled at these temperatures. The LT1637I is guaranteed to meet
specified performance from –40°C to 85°C.
= 0V, V
CM
OUT
= 0V, V
= V– unless otherwise specified. (Note 4)
SHDN
≤ 70°C●650kHz
0°C ≤ T
A
–40°C ≤ T
0°C ≤ T
–40°C ≤ T
≤ 85°C●600kHz
A
= ∞, VO = ±10V, Measure at VO = ±5V0.2250.4V/µs
L
≤ 70°C●0.200V/µs
A
≤ 85°C●0.180V/µs
A
Note 5: V
V
S
Note 6: V
V
S
Note 7: Guaranteed by correlation to slew rate at V
V
S
Note 8: This specification implies a typical input offset voltage of 650µV at
V
CM
Note 9: This parameter is not 100% tested.
= 5V limits are guaranteed by correlation to VS = 3V and
S
= ±15V or VS = ±22V tests.
= 3V limits are guaranteed by correlation to VS = 5V and
S
= ±15V or VS = ±22V tests.
= ±15V and GBW at
= 3V and V
= ±15V tests.
S
S
= 44V and a maximum input offset voltage of 5.4mV at VCM = 44V.
UW
TYPICAL PERFOR A CE CHARACTERISTICS
Supply Current vs Supply Voltage
400
350
300
T
250
200
150
SUPPLY CURRENT (µA)
100
50
0
0 10203040
TOTAL SUPPLY VOLTAGE (V)
= 125°C
A
T
= 25°C
A
T
= –55°C
A
1637 G01
Minimum Supply Voltage
400
300
200
100
0
T
= 125°C
A
–100
–200
–300
CHANGE IN INPUT OFFSET VOLTAGE (µV)
–400
12345
0
TOTAL SUPPLY VOLTAGE (V)
T
= –55°C
A
T
= 25°C
A
1637 G02
Input Bias Current
vs Common Mode Voltage
40
VS = 5V, 0V
30
20
10
T
= –55°C
0.12
0.08
0.04
INPUT BIAS CURRENT (µA)
0.04
0.08
A
T
= 125°C
A
T
= 25°C
0
4 4.2 4.4 4.6 4.8 5 10 20 30 40 50
A
COMMON MODE VOLTAGE (V)
1637 G03
5
Page 6
LT1637
TEMPERATURE (°C)
–50
SLEW RATE (V/µs)
25
1637 G12
–2505075100 125
0.7
0.6
0.5
0.4
0.3
0.2
0.1
FALLING, V
S
= ±1.5V
FALLING, V
S
= ±15V
RISING, V
S
= ±15V
RISING, V
S
= ±1.5V
UW
TYPICAL PERFOR A CE CHARACTERISTICS
Output Saturation Voltage
vs Load Current (Output High)
1
VS = 5V, 0V
= 30mV
V
OD
0.1
OUTPUT SATURATION VOLTAGE (V)
0.01
0.0001 0.001
T
= 125°C
A
T
= 25°C
A
T
= –55°C
A
0.010.1110100
SOURCING LOAD CURRENT (mA)
0.1Hz to 10Hz Noise Voltage
V
= ±2.5V
S
1637 G04
Output Saturation Voltage
vs Load Current (Output Low)
10
VS = 5V, 0V
= 30mV
V
OD
1
0.1
T
= 125°C
A
T
= 25°C
0.01
OUTPUT SATURATION VOLTAGE (V)
0.001
A
0.0001 0.001
T
= –55°C
A
0.010.1110100
SINKING LOAD CURRENT (mA)
Noise Voltage Density
vs Frequency
70
V
= ±15V
S
60
50
1637 G05
Output Saturation Voltage
vs Input Overdrive
100
VS = 5V, 0V
90
NO LOAD
80
70
60
50
40
30
20
OUTPUT SATURATION VOLTAGE (mV)
10
0
20
30
1090
0
INPUT OVERDRIVE (mV)
40
OUTPUT HIGH
OUTPUT LOW
60
50
70
Input Noise Current vs Frequency
1.4
V
= ±15V
S
1.2
1.0
0.8
80
100
1637 G06
INPUT NOISE CURRENT DENSITY (pA/√Hz)
0.6
0.4
0.2
0
1
101001000
FREQUENCY (Hz)
1637 G09
40
NOISE VOLTAGE (200nV/DIV)
2
0
3
19
4
TIME (s)
6
7
8
5
10
1637 G07
Open-Loop Gain and Phase Shift
vs FrequencySlew Rate vs Temperature
70
V
= ±2.5V
60
50
40
30
20
GAIN (dB)
10
0
–10
–20
–30
1k
GAIN
10k100k1M
FREQUENCY (Hz)
S
PHASE
120
100
80
60
40
20
0
1637 G10
30
INPUT NOISE VOLTAGE DENSITY (nV/√Hz)
20
1
101001000
FREQUENCY (Hz)
Gain-Bandwidth Product
vs Temperature
1300
1200
PHASE SHIFT (DEG)
1100
1000
900
800
GAIN-BANDWIDTH PRODUCT (kHz)
700
–50
–250
V
= ±15V
S
V
= ±1.5V
S
50100 125
2575
TEMPERATURE (°C)
1637 G08
1637 G11
6
Page 7
UW
TYPICAL PERFOR A CE CHARACTERISTICS
Gain-Bandwidth Product and
Phase Margin vs Supply VoltageCMRR vs FrequencyPSRR vs Frequency
1300
1250
1200
1150
1100
1050
GAIN-BANDWIDTH PRODUCT (kHz)
1000
515
0
PHASE MARGIN
GAIN BANDWIDTH
10
TOTAL SUPPLY VOLTAGE (V)
2545
20
55
50
45
40
35
30
40
1637 G13
25
35
30
100
90
PHASE MARGIN (DEG)
80
70
60
50
40
30
20
10
COMMON MODE REJECTION RATIO (dB)
0
1k
V
= ±15V
S
V
= ±1.5V
S
10k100k1M
FREQUENCY (Hz)
1637 G14
90
V
= ±2.5V
S
80
70
60
50
40
30
NEGATIVE SUPPLY
20
10
0
POWER SUPPLY REJECTION RATIO (dB)
–10
1k
LT1637
POSITIVE SUPPLY
10k100k1M
FREQUENCY (Hz)
1637 G15
Gain-Bandwidth Product and
Phase Margin vs Load Resistance
1400
V
= ±2.5V
S
1300
1200
1100
1000
900
800
GAIN-BANDWIDTH PRODUCT (kHz)
700
600
GAIN BANDWIDTH
1k
LOAD RESISTANCE (Ω)
PHASE MARGIN
10k100k
Settling Time to 0.1%
vs Output Step
10
V
= ±15V
S
8
6
AV = 1
4
2
0
–2
OUTPUT STEP (V)
–4
–6
–8
–10
0
AV = 1
10
SETTLING TIME (µs)
AV = –1
AV = –1
20
Undistorted Output Swing
Output Impedance vs Frequency
50
45
40
35
30
25
20
15
10
1637 G16
10k
V
S
PHASE MARGIN (DEG)
1k
100
10
OUTPUT IMPEDANCE (Ω)
1
0.1
100
= ±2.5V
AV = 100
AV = 10
AV = 1
1k100k1M10k
FREQUENCY (Hz)
1637 G17
Capacitive Load Handling,
Overshoot vs Capacitive Load
100
V
= ±2.5V
S
90
NO OUTPUT COMPENSATION
80
70
60
50
40
OVERSHOOT (%)
30
20
10
30
40
1637 G19
0
10
AV = 1
100100010000
CAPACITIVE LOAD (pF)
AV = 2
AV = 5
AV = 10
1637 G20
vs Frequency
35
V
= ±15V
s
30
)
25
P-P
20
15
10
OUTPUT SWING (V
V
= ±2.5V
s
5
0
100
1k10k100k
FREQUENCY (Hz)
DISTORTION ≤ 1%
= 1
A
V
Total Harmonic Distortion + Noise
vs Frequency
10
VS = 3V, 0V
= 1.8V
V
OUT
=10k
L
AV = –1
AV = 1
10010k100k1k
P-P
FREQUENCY (Hz)
VCM = 1.2V
1
R
0.1
0.01
THD + NOISE (%)
0.001
0.0001
10
1637 G18
1637 G21
7
Page 8
LT1637
OUTPUT VOLTAGE (V
P-P
)
0.01
THD + NOISE (%)
1
10
023
1637 G23
0.001
1
0.1
RL = 10k
V
CM
= HALF SUPPLY
f = 1kHz
FOR A
V
= –1, RG = 100k
AV = –1, VS = 3V, 0V
AV = 1
V
S
= ±1.5V
AV = 1
V
S
= 3V, 0V
AV = 1
V
S
= 3V, 0V
AV = –1
V
S
= ±1.5V
UW
TYPICAL PERFOR A CE CHARACTERISTICS
Total Harmonic Distortion + Noise
vs Load Resistance
1
V
= ±1.5V
S
= ±0.9V
V
0.1
0.01
THD + NOISE (%)
0.001
0.0001
IN
VS = 3V, 0V
V
IN
VS = 3V, 0V
V
IN
100
LOAD RESISTANCE TO GROUND (Ω)
Open-Loop Gain
A
B
C
(50µV/DIV)
A: RL = 2k
B: RL = 10k
= 50k
C: R
CHANGE IN INPUT OFFSET VOLTAGE
L
–10V
OUTPUT VOLTAGE (5V/DIV)
0V10V
VS = 3V TOTAL
= 1
A
V
= 1.8V
P-P
AT 1kHz
V
IN
= 0.6V TO 2.4V
= 0.3V TO 2.1V
1k10k100k
V
= ±15V
S
A
B
C
1637 G24
1637 G22
Large-Signal Response
= ±15V
V
S
AV = –1
10V
– 10V
Total Harmonic Distortion + Noise
vs Output Voltage
Small-Signal Response
V
= ±15V
S
AV = 1
50mV
–50mV
1637 G25
1637 G26
U
APPLICATIOS IFORATIO
Supply Voltage
The positive supply pin of the LT1637 should be bypassed
with a small capacitor (about 0.01µF) within an inch of the
pin. When driving heavy loads an additional 4.7µF electro-
lytic capacitor should be used. When using split supplies,
the same is true for the negative supply pin.
The LT1637 is protected against reverse battery voltages
up to 25V. In the event a reverse battery condition occurs,
the supply current is typically less than 1nA.
When operating the LT1637 on total supplies of 30V or
more, the supply must not be brought up faster 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. 5Ω of resistance in
the supply or the bypass capacitor will dampen the tuned
circuit enough to limit the rise time.
8
WUU
Inputs
The LT1637 has 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 0.9V or more below V+, the PNP
input stage is active and the input bias current is typically
–20nA. 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 80nA. Increases in temperature will
cause the voltage at which operation switches from the
PNP stage to the NPN stage to move towards V+. The input
offset voltage of the NPN stage is untrimmed and is
typically 600µV.
Page 9
LT1637
U
WUU
APPLICATIOS IFORATIO
A Schottky diode in the collector of each NPN transistor of
the NPN input stage allows the LT1637 to operate with
either or both of its inputs above V+. At about 0.3V above
V+ the NPN input transistor is fully saturated and the input
bias current is typically 23µA at room temperature. The
input offset voltage is typically 600µV when operating
above V+. The LT1637 will operate with its input 44V above
V– regardless of V+.
The inputs are protected against excursions as much as
22V below V– by an internal 1.3k 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
5V below V–. There are no clamping diodes between the
inputs and the maximum differential input voltage is 44V.
Output
The output voltage swing of the LT1637 is affected by
input overdrive as shown in the typical performance
curves. When monitoring input voltages within 100mV of
V+, gain should be taken to keep the output from clipping.
The output of the LT1637 can be pulled up to 25V beyond
V+ with less than 1nA of leakage current, provided that V
is less than 0.5V.
The normally reverse biased substrate diode from the
output to V– will cause unlimited currents to flow when the
output is forced below V–. If the current is transient and
limited to 100mA, no damage will occur.
The LT1637 is internally compensated to drive at least
200pF of capacitance under any output loading condi-
tions. A 0.22µF capacitor in series with a 150Ω resistor
between the output and ground will compensate these
amplifiers for larger capacitive loads, up to 4700pF, at all
output currents.
+
Lower load resistance increases the output crossover
distortion, but has no effect on the input stage transition
distortion. For lowest distortion the LT1637 should be
operated single supply, with the output always sourcing
current and with the input voltage swing between ground
and (V+ – 0.9V). See the Typical Performance Characteristics curves.
Gain
The open-loop gain is less sensitive to load resistance
when the output is sourcing current. This optimizes performance 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.
Shutdown
The LT1637 can be shut down two ways: using the
shutdown pin or bringing V+ to within 0.5V of V–. When V
+
is brought to within 0.5V of V– both the supply current and
output leakage current drop to less than 10nA. When the
shutdown pin is brought 1.2V above V–, the supply
current drops to about 3µA and the output leakage current
is less than 1µA, independent of V
+
. In either case the input
bias current is less than 0.1nA (even if the inputs are 44V
above the negative supply).
The shutdown pin can be taken up to 32V above V–. The
shutdown pin can be driven below V–, however the pin
current through the substrate diode should be limited with
an external resistor to less than 10mA.
Input Offset Nulling
The input offset voltage can be nulled by placing a 10k
potentiometer between Pins 1 and 8 with its wiper to V
–
(see Figure 1). The null range will be at least ±3mV.
Distortion
There are two main contributors of distortion in op amps:
output crossover distortion as the output transitions from
sourcing to sinking current and distortion caused by
nonlinear common mode rejection. Of course, if the op
amp is operating inverting there is no common mode
induced distortion. When the LT1637 switches between
input stages there is significant nonlinearity in the CMRR.
LT1637
8
1
10k
–
V
Figure 1. Input Offset Nulling
1637 F01
9
Page 10
LT1637
–
+
LT1637
5k
1M
5V TO 44V
3V
100k
0.5Ω
LAMP
ON/OFF
OUT
1637 TA05
OUT = 0V FOR GOOD BULB
3V FOR OPEN BULB
SI PLIFIED
SHDN
5
R1
1M
Q3
10µA
WW
SCHE ATIC
R2
6k
–IN
Q2
+IN
R3
1.3k
2
R4
1.3k
3
Q9
Q11
D1D2
Q12
Q14
+
7
Q25
Q26
V
6
OUT
Q13Q1
Q15Q10
Q16
Q18
Q17
Q19
Q23
D3
Q20
Q21
Q22
Q24
Q4
Q6
Q5
Q7
Q8
U
TYPICAL APPLICATIOS
Positive Supply Rail Current Sense
+
V
200Ω
5V
0.2Ω
200Ω
LOAD
I
LOAD
V
+
–
OUT
LT1637
= (2Ω)(I
LOAD
Q1
2N3904
0V TO 4.3V
2k
1637 TA02
)
D4
D5
Optional Output Compensation for
Capacitive Loads Greater Than 200pF
V
IN
+
LT1637
–
0.22µF
150Ω
1637 TA03
R5
7k
R7
400Ω
C
≤ 4700pF
L
R6
7k
R8
400Ω
81
NULLNULL
Lamp Outage Detector
1637 SS
–
4
V
10
Over-The-Top Comparator with Hysteresis
(0V TO 44V)
(0V TO 44V)
10k
IN1
10k
IN2
HYSTERESIS =
V
CC
100
3V TO 44V
+
LT1637
–
1M
1M
2N5087
2N5210
1637 TA04
1M
1M
Over-The-Top Current Sense
0.1V TO 44V
R1
200Ω
5V
R
LOAD
S
0.2Ω
I
LOAD
V
OUT
I
LOAD
+
LT1637
–
V
=
(RS)(R2/R1)
OUT
Q1
2N3904
R2
2k
1637 TA06
V
OUT
(0V TO 4.3V)
Page 11
PACKAGE DESCRIPTIO
0.007
(0.18)
0.021
± 0.006
(0.53 ± 0.015)
* DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH,
PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
** DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.
INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
° – 6° TYP
0
U
Dimensions in inches (millimeters) unless otherwise noted.
MS8 Package
8-Lead Plastic MSOP
(LTC DWG # 05-08-1660)
0.118 ± 0.004*
(3.00 ± 0.102)
0.193 ± 0.006
(4.90 ± 0.15)
SEATING
PLANE
0.040
± 0.006
(1.02 ± 0.15)
0.012
(0.30)
0.0256
REF
(0.65)
BSC
0.034 ± 0.004
(0.86 ± 0.102)
0.006 ± 0.004
(0.15 ± 0.102)
N8 Package
8-Lead PDIP (Narrow 0.300)
(LTC DWG # 05-08-1510)
8
7
12
6
5
0.118 ± 0.004**
4
3
LT1637
(3.00 ± 0.102)
MSOP (MS8) 1098
0.300 – 0.325
(7.620 – 8.255)
0.065
(1.651)
0.009 – 0.015
(0.229 – 0.381)
+0.035
0.325
–0.015
+0.889
8.255
()
–0.381
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)
TYP
0.045 – 0.065
(1.143 – 1.651)
0.100
(2.54)
BSC
8-Lead Plastic Small Outline (Narrow 0.150)
0.010 – 0.020
(0.254 – 0.508)
0.008 – 0.010
(0.203 – 0.254)
*
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
× 45°
0.016 – 0.050
(0.406 – 1.270)
0.053 – 0.069
(1.346 – 1.752)
0°– 8° TYP
0.014 – 0.019
(0.355 – 0.483)
TYP
0.130 ± 0.005
(3.302 ± 0.127)
0.125
(3.175)
MIN
0.018 ± 0.003
(0.457 ± 0.076)
S8 Package
(LTC DWG # 05-08-1610)
0.004 – 0.010
(0.101 – 0.254)
0.050
(1.270)
BSC
0.020
(0.508)
MIN
0.228 – 0.244
(5.791 – 6.197)
0.255 ± 0.015*
(6.477 ± 0.381)
87 6
12
0.189 – 0.197*
(4.801 – 5.004)
7
8
1
2
0.400*
(10.160)
MAX
6
3
5
4
3
N8 1098
5
0.150 – 0.157**
(3.810 – 3.988)
4
SO8 1298
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
Page 12
LT1637
U
TYPICAL APPLICATIOS
3V
V
SAMPLE
0V
DROOP (LT1636 BUFFER): 200mV/s
DROOP INTO HIGH IMPEDANCE : LESS THAN 0.625mV/s
Sample-and-Hold
3V
+
LT1636
–
3V
V
OUT
1637 TA07
V
+
IN
LT1637
–
SHDN
150Ω
0.22µF
MUX Amplifier Waveforms
0.2ms/DIV
1637 TA08
5kHz AT 4V
10kHz AT 2V
INPUT SELECT
1kHz AT 5V
MUX Amplifier
5V
V
IN1
P-P
V
IN2
P–P
P–P
SHDN
74HC04
+
LT1637
–
SHDN
–
LT1637
+
V
OUT
V
OUT
2V/DIV
5V
INPUT
SELECT
5V/DIV
1637 TA09
RELATED PARTS
PART NUMBERDESCRIPTIONCOMMENTS
LT1078/LT1079Dual/Quad 55µA Max, Single Supply, Precision Op AmpsInput/Output Common Mode Includes Ground, 70µV V
LT2078/LT2079and 2.5µV/°C Drift (Max), 200kHz GBW, 0.07V/µs Slew Rate
LT1178/LT1179Dual/Quad 17µA Max, Single Supply, Precison Op AmpsInput/Output Common Mode Includes Ground, 70µV V
LT2178/LT2179and 4µV/°C Drift (Max), 85kHz GBW, 0.04V/µs Slew Rate
LT1366/LT1367Dual/Quad Precision, Rail-to-Rail Input and Output Op Amps475µV V