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Электронный компонент: LT1236CI

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LT1236
Precision Reference
U
A
O
PPLICATI
TYPICAL
D
U
ESCRIPTIO
The LT
1236 is a precision reference that combines ultra-
low drift and noise with excellent long-term stability and
high output accuracy. The reference output will both
source and sink up to 10mA and is almost totally immune
to input voltage variations. Two voltages are available: 5V
and 10V. The 10V version can be used as a shunt regulator
(two-terminal zener) with the same precision characteris-
tics as the three-terminal connection. Special care has
been taken to minimize thermal regulation effects and
temperature induced hysteresis.
The LT1236 combines both superior accuracy and tem-
perature coefficient specifications without the use of high
power, on-chip heaters. The LT1236 references are based
on a buried zener diode structure which eliminates noise
and stability problems with surface breakdown devices.
Further, a subsurface zener exhibits better temperature
drift and time stability than even the best band-gap
references.
S
FEATURE
s
Ultra-Low Drift: 5ppm/
C Max
s
Trimmed to High Accuracy: 0.05% Max
s
Industrial Temperature Range SO Package
s
Operates in Series or Shunt Mode
s
Pin Compatible with AD586, AD587
s
Output Sinks and Sources in Series Mode
s
Very Low Noise < 1ppm
P-P
(0.1Hz to 10Hz)
s
100% Noise Tested
s
> 100dB Ripple Rejection
s
Minimum Input/Output Differential of 1V
, LTC and LT are registered trademarks of Linear Technology Corporation.
Typical Distribution of Temperature Drift
Basic Positive and Negative Connections
LT1236
OUT
IN
GND
LT1236-10
OUT
IN
GND
V
OUT
V
OUT
V
IN
NC
R1 =
V
OUT
(V
)
I
LOAD
+ 1.5mA
15V
(V
)
R1
LT1236 TA01
OUTPUT DRIFT (ppm/
C)
3
0
UNITS (%)
4
8
12
16
24
22
2
1
0
1
LT1236 TA02
2
3
20
18
14
10
6
2
DISTRIBUTION
OF THREE RUNS
U
S
A
O
PPLICATI
s
A/D and D/A Converters
s
Precision Regulators
s
Precision Scales
s
Inertial Navigation Systems
s
Digital Voltmeters
2
LT1236
1
2
3
4
8
7
6
5
TOP VIEW
NC*
V
IN
NC*
GND
NC*
NC*
V
0UT
TRIM**
S8 PACKAGE
8-LEAD PLASTIC SO
CONNECTED INTERNALLY.
D0 NOT CONNECT EXTERNAL
CIRCUITRY TO THESE PINS
SEE APPLICATIONS
INFORMATION SECTION
*
**
A
U
G
W
A
W
U
W
A
R
BSOLUTE
XI
TI
S
Input Voltage .......................................................... 40V
Input/Output Voltage Differential ............................ 35V
Output-to-Ground Voltage (Shunt Mode Current Limit)
LT1236-5 ............................................................. 10V
LT1236-10 ........................................................... 16V
Trim Pin-to-Ground Voltage
Positive................................................ Equal to V
OUT
Negative ........................................................... 20V
Output Short-Circuit Duration
V
IN
= 35V ......................................................... 10 sec
V
IN
20V ................................................... Indefinite
Operating Temperature Range
LT1236AC, BC, CC .................................. 0
C to 70
C
LT1236AI, BI, CI ................................ 40
C to 85
C
Storage Temperature Range ................ 65
C to 150
C
Lead Temperature (Soldering, 10 sec) ................ 300
C
W
U
U
PACKAGE/ORDER I FOR ATIO
Consult factory for Military grade parts.
ELECTRICAL C
C
HARA TERISTICS
V
IN
= 10V, I
OUT
= 0, T
A
= 25
C, unless otherwise noted.
LT1236-5
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Output Voltage (Note 1)
LT1236A-5
4.9975
5.000
5.0025
V
LT1236B-5/LT1236C-5
4.9950
5.000
5.0050
V
Output Voltage Temperature Coefficient (Note 2)
T
MIN
T
J
T
MAX
LT1236A-5
2
5
ppm/
C
LT1236B-5
5
10
ppm/
C
LT1236C-5
10
15
ppm/
C
Line Regulation (Note 3)
7.2V
V
IN
10V
4
12
ppm/V
q
20
ppm/V
10V
V
IN
40V
2
6
ppm/V
q
10
ppm/V
Load Regulation (Sourcing Current)
0
I
OUT
10mA
10
20
ppm/mA
(Note 3)
q
35
ppm/mA
LT1236AIS8-5
LT1236BIS8-5
LT1236CIS8-5
LT1236AIS8-10
LT1236BIS8-10
LT1236CIS8-10
ORDER PART
NUMBER
S8 PART MARKING
LT1236ACS8-5
LT1236BCS8-5
LT1236CCS8-5
LT1236ACS8-10
LT1236BCS8-10
LT1236CCS8-10
236AC5
236BC5
236CC5
236AC1
236BC1
236CC1
236AI5
236BI5
236CI5
236AI1
236BI1
236CI1
T
JMAX
= 125
C,
JA
= 190
C/W
T
JMAX
= 125
C,
JA
= 130
C/W
ORDER PART
NUMBER
LT1236ACN8-5
LT1236BCN8-5
LT1236CCN8-5
LT1236ACN8-10
LT1236BCN8-10
LT1236CCN8-10
LT1236AIN8-5
LT1236BIN8-5
LT1236CIN8-5
LT1236AIN8-10
LT1236BIN8-10
LT1236CIN8-10
1
2
3
4
8
7
6
5
TOP VIEW
NC*
V
IN
NC*
GND
NC*
NC*
V
0UT
TRIM**
N8 PACKAGE
8-LEAD PDIP
CONNECTED INTERNALLY.
D0 NOT CONNECT EXTERNAL
CIRCUITRY TO THESE PINS
SEE APPLICATIONS
INFORMATION SECTION
*
**
3
LT1236
ELECTRICAL C
C
HARA TERISTICS
V
IN
= 10V, I
OUT
= 0, T
A
= 25
C, unless otherwise noted.
LT1236-10
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Output Voltage (Note 1)
LT1236A-10
9.995
10.000
10.005
V
LT1236B-10/LT1236C-10
9.990
10.000
10.010
V
Output Voltage Temperature Coefficient (Note 2)
T
MIN
T
J
T
MAX
LT1236A-10
2
5
ppm/
C
LT1236B-10
5
10
ppm/
C
LT1236C-10
10
15
ppm/
C
Line Regulation (Note 3)
11.5V
V
IN
14.5V
1.0
4
ppm/V
q
6
ppm/V
14.5V
V
IN
40V
0.5
2
ppm/V
q
4
ppm/V
Load Regulation (Sourcing Current)
0
I
OUT
10mA
12
25
ppm/mA
(Note 3)
q
40
ppm/mA
Load Regulation (Shunt Mode)
1.7mA
I
SHUNT
10mA
50
100
ppm/mA
(Notes 3, 4)
q
150
ppm/mA
Series Mode Supply Current
1.2
1.7
mA
q
2.0
mA
Shunt Mode Minimum Current
V
IN
is Open
1.1
1.5
mA
q
1.7
mA
Output Voltage Noise (Note 5)
0.1Hz
f
10Hz
6.0
V
P-P
10Hz
f
1kHz
3.5
6
V
RMS
Long-Term Stablility of Output Voltage (Note 6)
t = 1000Hrs Non-Cumulative
30
ppm
Temperature Hysteresis of Output (Note 7)
T =
25
C
5
ppm
V
IN
= 15V, I
OUT
= 0, T
A
= 25
C, unless otherwise noted.
Note 5: RMS noise is measured with a 2-pole highpass filter at 10Hz and a
2-pole lowpass filter at 1kHz. The resulting output is full-wave rectified and
then integrated for a fixed period, making the final reading an average as
opposed to RMS. Correction factors are used to convert from average to
RMS, and 0.88 is used to correct for the non-ideal bandbass of the filters.
Peak-to-peak noise is measured with a single highpass filter at 0.1Hz and a
2-pole lowpass filter at 10Hz. The unit is enclosed in a still-air environment
to eliminate thermocouple effects on the leads. Test time is 10 seconds.
Note 6: Long-term stability typically has a logarithmic characteristic and
therefore, changes after 1000 hours tend to be much smaller than before
that time. Total drift in the second thousand hours is normally less than
one third that of the first thousand hours, with a continuing trend toward
reduced drift with time. Significant improvement in long-term drift can be
The
q
denotes specifications which apply over the specified temperature
range.
Note 1: Output voltage is measured immediately after turn-on. Changes
due to chip warm-up are typically less than 0.005%.
Note 2: Temperature coefficient is measured by dividing the change in
output voltage over the temperature range by the change in temperature.
Incremental slope is also measured at 25
C.
Note 3: Line and load regulation are measured on a pulse basis. Output
changes due to die temperature change must be taken into account
separately.
Note 4: Shunt mode regulation is measured with the input open. With the
input connected, shunt mode current can be reduced to 0mA. Load
regulation will remain the same.
LT1236-5
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Load Regulation (Sinking Current)
0
I
OUT
10mA
60
100
ppm/mA
(Note 3)
q
150
ppm/mA
Supply Current
0.8
1.2
mA
q
1.5
mA
Output Voltage Noise
0.1Hz
f
10Hz
3.0
V
P-P
(Note 5)
10Hz
f
1kHz
2.2
3.5
V
RMS
Long-Term Stability of Output Voltage (Note 6)
t = 1000Hrs Non-Cumulative
20
ppm
Temperature Hysteresis of Output (Note 7)
T =
25
C
10
ppm
4
LT1236
ELECTRICAL C
C
HARA TERISTICS
V
IN
= 15V, I
OUT
= 0, T
A
= 25
C, unless otherwise noted.
realized by preconditioning the IC with a 100-200 hour, 125
C burn in.
Long term stability will also be affected by differential stresses between the
IC and the board material created during board assembly. Temperature
cycling and baking of completed boards is often used to reduce these
stresses in critical applications.
Note 7: Hysteresis in output voltage is created by package stress that
differs depending on whether the IC was previously at a higher or lower
temperature. Output voltage is always measured at 25
C, but the IC is
cycled to 50
C or 0
C before successive measurements. Hysteresis is
roughly proportional to the square of temperature change. Hysteresis is
not normally a problem for operational temperature excursions, but can be
significant in critical narrow temperature range applications where the
instrument might be stored at high or low temperatures.
C
C
HARA TERISTICS
U
W
A
TYPICAL PERFOR
CE
Ripple Rejection
INPUT VOLTAGE (V)
0
85
REJECTION (dB)
90
95
100
105
10
20
30
40
LT1236 G01
110
115
5
15
25
35
f = 150Hz
LT1236-5
LT1236-10
FREQUENCY (Hz)
10
90
REJECTION (dB)
110
130
120
100
80
60
100
1k
10k
LT1236 G02
70
50
V
IN
= 15V
C
OUT
= 0
LT1236-5
LT1236-10
Ripple Rejection
Minimum Input/Output
Differential, LT1236-10
OUTPUT CURRENT (mA)
0
INPUT/OUTPUT VOLTAGE (V)
1.2
1.6
16
LT1236 G03
0.8
0.4
0
4
8
12
20
1.0
1.4
0.6
0.2
14
2
6
10
18
T
J
= 125
C
T
J
= 55
C
T
J
= 25
C
Start-Up (Series Mode)
TIME (
s)
3
OUTPUT VOLTAGE (V)
4
6
7
8
13
10
2
6
8
LT1236 G04
5
11
12
9
0
4
10
12
14
LT1236-10
LT1236-5
V
IN
= 0V TO 12V
Start-Up (Shunt Mode), LT1236-10
Output Voltage Noise Spectrum
FREQUENCY (Hz)
100
NOISE VOLTAGE (nV/
Hz)
200
250
350
400
10
1k
1M
LT1236 G06
0
100
300
150
50
LT1236-10
LT1236-5
TIME (
s)
OUTPUT VOLTAGE (V)
9
10
11
4
8
LT1236 G05
8
7
0
2
6
10
12
6
5
LT1236-10
IN
GND
OUT
NC
1k
V
OUT
0V
V
OUT
+ 2V
5
LT1236
C
C
HARA TERISTICS
U
W
A
TYPICAL PERFOR
CE
Output Noise 0.1Hz to 10Hz,
LT1236-5
TIME (MINUTES)
0
3
5
LT1236 G15
1
2
4
6
OUTPUT VOLTAGE NOISE (5
V/DIV)
5
V (1ppm)
FILTERING = 1 ZERO AT 0.1Hz
2 POLES AT 10Hz
Output Voltage Noise
BANDWIDTH (Hz)
10
8
RMS NOISE (
V)
12
16
14
10
6
2
100
1k
10k
LT1236 G07
4
0
C
OUT
= 0
FILTER = 1 POLE
f
LOW
= 0.1Hz
LT1236-10
LT1236-5
Output Voltage Temperature Drift
LT1236-5
OUTPUT CURRENT (mA)
10
OUTPUT CHANGE (mV)
1
3
5
4
2
0
2
4
6
LT1236 G09
1
3
5
6
8
4
0
4
8
2
2
10
V
IN
= 8V
SOURCING
SINKING
Load Regulation LT1236-5
Quiescent Current, LT1236-5
INPUT VOLTAGE (V)
0
0
INPUT CURRENT (mA)
0.2
0.6
0.8
1.0
35
30
1.8
LT1236 G10
0.4
5
10
15
20
25
40
1.2
1.4
1.6
T
J
= 55
C
T
J
= 25
C
T
J
= 125
C
I
OUT
= 0
Thermal Regulation, LT1236-5
TIME (ms)
OUTPUT CHANGE (mV)
1.0
0.5
140
LT1236 G12
20
60
100
0
0
40
80
120
LOAD
REGULATION
THERMAL
REGULATION*
I
LOAD
= 10mA
*INDEPENDENT OF TEMPERATURE COEFFICIENT
V
IN
= 25V
POWER = 200mW
Sink Mode* Current Limit,
LT1236-5
OUTPUT VOLTAGE (V)
0
0
CURRENT INTO OUTPUT (mA)
10
30
40
50
4
8
10
18
LT1236 G11
20
2
6
12
14
16
60
V
IN
= 8V
*NOTE THAT AN INPUT VOLTAGE IS REQUIRED
FOR 5V UNITS.
Load Transient Response,
LT1236-5, C
LOAD
= 0
TIME (
s)
OUTPUT CHANGE (50mV/DIV)
2
LT1236 G13
1
0
2
4
1
3
3
0
4
I
SOURCE
= 2-10mA
I
SOURCE
= 0.5mA
I
SINK
= 0
I
SINK
= 0.2mA
I
SINK
= 2-10mA
50mV
50mV
I
SINK
= 100
A
P-P
I
SOURCE
= 100
A
P-P
I
SOURCE
= 0
Load Transient Response,
LT1236-5, C
LOAD
= 1000pF
TIME (
s)
OUTPUT CHANGE (20mV/DIV)
10
LT1236 G14
5
0
10
20
5
15
15
0
20
I
SOURCE
= 2-10mA
I
SOURCE
= 0.2mA
I
SINK
= 0
I
SINK
= 0.2mA
I
SINK
= 2-10mA
20mV
20mV
I
SINK
= 100
A
P-P
I
SOURCE
= 100
A
P-P
I
SOURCE
= 0
TEMPERATURE (
C)
40
5.000
OUTPUT VOLTAGE (V)
5.002
5.005
0
40
60
LT1236 G08
5.001
5.004
5.003
20
20
80
100