概述
规格参数
数据手册LT1236BCS8-10 概述
Precision Reference 精密基准 参考电压源
LT1236BCS8-10 规格参数
| 是否Rohs认证： | 不符合 | 生命周期： | Transferred |
| 零件包装代码： | SOIC | 包装说明： | SOP, SOP8,.25 |
| 针数： | 8 | Reach Compliance Code： | not_compliant |
| ECCN代码： | EAR99 | HTS代码： | 8542.39.00.01 |
| 风险等级： | 5.52 | 模拟集成电路 - 其他类型： | THREE TERMINAL VOLTAGE REFERENCE |
| JESD-30 代码： | R-PDSO-G8 | JESD-609代码： | e0 |
| 长度： | 4.9 mm | 湿度敏感等级： | 1 |
| 功能数量： | 1 | 输出次数： | 1 |
| 端子数量： | 8 | 最高工作温度： | 70 °C |
| 最低工作温度： | 最大输出电压： | 10.01 V | |
| 最小输出电压： | 9.99 V | 标称输出电压： | 10 V |
| 封装主体材料： | PLASTIC/EPOXY | 封装代码： | SOP |
| 封装等效代码： | SOP8,.25 | 封装形状： | RECTANGULAR |
| 封装形式： | SMALL OUTLINE | 峰值回流温度（摄氏度）： | 235 |
| 认证状态： | Not Qualified | 座面最大高度： | 1.75 mm |
| 子类别： | Voltage References | 最大供电电流 (Isup)： | 1.2 mA |
| 表面贴装： | YES | 技术： | BIPOLAR |
| 最大电压温度系数： | 10 ppm/°C | 温度等级： | COMMERCIAL |
| 端子面层： | Tin/Lead (Sn/Pb) | 端子形式： | GULL WING |
| 端子节距： | 1.27 mm | 端子位置： | DUAL |
| 处于峰值回流温度下的最长时间： | 20 | 微调/可调输出： | YES |
| 最大电压容差： | 0.1% | 宽度： | 3.9 mm |
LT1236BCS8-10 数据手册
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PDF下载LT1236
Precision Reference
U
DESCRIPTIO
EATURE
S
F
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
and10V. The10Vversioncanbeusedasashuntregulator
(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.
■
■
■
■
■
■
■
■
■
■
Ultra-Low Drift: 5ppm/°C Max
Trimmed to High Accuracy: 0.05% Max
Industrial Temperature Range SO Package
Operates in Series or Shunt Mode
Pin Compatible with AD586, AD587
Output Sinks and Sources in Series Mode
Very Low Noise < 1ppm P-P (0.1Hz to 10Hz)
100% Noise Tested
> 100dB Ripple Rejection
Minimum Input/Output Differential of 1V
The LT1236 combines both superior accuracy and tem-
peraturecoefficientspecificationswithouttheuseofhigh
power,on-chipheaters.TheLT1236referencesarebased
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.
O U
PPLICATI
S
A
■
■
■
■
■
A/D and D/A Converters
Precision Regulators
Precision Scales
Inertial Navigation Systems
Digital Voltmeters
, LTC and LT are registered trademarks of Linear Technology Corporation.
U
O
TYPICAL APPLICATI
Typical Distribution of Temperature Drift
Basic Positive and Negative Connections
24
DISTRIBUTION
OF THREE RUNS
22
LT1236
LT1236-10
IN
OUT
20
18
16
14
12
10
8
V
IN
IN
V
OUT
OUT
NC
GND
GND
–V
OUT
–
V
OUT
– (V )
+ 1.5mA
R1 =
R1
–15V
I
LOAD
6
–
(V
)
4
LT1236 TA01
2
0
–3
–1
0
1
2
3
–2
OUTPUT DRIFT (ppm/°C)
LT1236 TA02
1
LT1236
W W W
U
ABSOLUTE AXI U RATI GS
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
Output Short-Circuit Duration
VIN = 35V......................................................... 10 sec
VIN ≤ 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
Positive................................................ Equal to VOUT
Negative ........................................................... – 20V
W
U
/O
PACKAGE RDER I FOR ATIO
ORDER PART
NUMBER
ORDER PART
NUMBER
TOP VIEW
TOP VIEW
LT1236ACN8-5
LT1236ACS8-5 LT1236AIS8-5
NC*
1
2
3
4
NC*
NC*
8
7
6
5
LT1236BCN8-5
LT1236CCN8-5
LT1236ACN8-10
LT1236BCN8-10
LT1236CCN8-10
LT1236AIN8-5
LT1236BIN8-5
LT1236CIN8-5
LT1236AIN8-10
LT1236BIN8-10
LT1236CIN8-10
NC*
1
2
3
4
NC*
NC*
LT1236BIS8-5
LT1236CIS8-5
LT1236AIS8-10
8
7
6
5
LT1236BCS8-5
LT1236CCS8-5
LT1236ACS8-10
V
IN
V
IN
NC*
GND
V
NC*
GND
V
0UT
0UT
LT1236BCS8-10 LT1236BIS8-10
LT1236CCS8-10 LT1236CIS8-10
TRIM**
TRIM**
N8 PACKAGE
8-LEAD PDIP
S8 PACKAGE
8-LEAD PLASTIC SO
*CONNECTED INTERNALLY.
D0 NOT CONNECT EXTERNAL
CIRCUITRY TO THESE PINS
S8 PART MARKING
*CONNECTED INTERNALLY.
D0 NOT CONNECT EXTERNAL
CIRCUITRY TO THESE PINS
236AC5
236BC5
236CC5
236AC1
236BC1
236CC1
236AI5
236BI5
236CI5
236AI1
236BI1
236CI1
**SEE APPLICATIONS
INFORMATION SECTION
**SEE APPLICATIONS
INFORMATION SECTION
TJMAX = 125°C, θJA = 130°C/W
TJMAX = 125°C, θJA = 190°C/W
Consult factory for Military grade parts.
ELECTRICAL CHARACTERISTICS VIN = 10V, IOUT = 0, TA = 25°C, unless otherwise noted.
LT1236-5
TYP
PARAMETER
CONDITIONS
MIN
MAX
UNITS
Output Voltage (Note 1)
LT1236A-5
LT1236B-5/LT1236C-5
4.9975
4.9950
5.000
5.000
5.0025
5.0050
V
V
Output Voltage Temperature Coefficient (Note 2)
Line Regulation (Note 3)
T
≤ T ≤ T
MIN J MAX
LT1236A-5
LT1236B-5
LT1236C-5
2
5
10
5
10
15
ppm/°C
ppm/°C
ppm/°C
7.2V ≤ V ≤ 10V
4
12
20
6
ppm/V
ppm/V
ppm/V
ppm/V
IN
●
●
10V ≤ V ≤ 40V
2
IN
10
Load Regulation (Sourcing Current)
(Note 3)
0 ≤ I
≤ 10mA
10
20
35
ppm/mA
ppm/mA
OUT
●
2
LT1236
ELECTRICAL CHARACTERISTICS VIN = 10V, IOUT = 0, TA = 25°C, unless otherwise noted.
LT1236-5
TYP
PARAMETER
CONDITIONS
0 ≤ I ≤ 10mA
MIN
MAX
UNITS
Load Regulation (Sinking Current)
(Note 3)
60
100
150
ppm/mA
ppm/mA
OUT
●
●
Supply Current
0.8
1.2
1.5
mA
mA
Output Voltage Noise
(Note 5)
0.1Hz ≤ f ≤ 10Hz
10Hz ≤ f ≤ 1kHz
3.0
2.2
µV
P-P
3.5
µV
RMS
Long-Term Stability of Output Voltage (Note 6)
Temperature Hysteresis of Output (Note 7)
∆t = 1000Hrs Non-Cumulative
∆T = ±25°C
20
10
ppm
ppm
VIN = 15V, IOUT = 0, TA= 25°C, unless otherwise noted.
LT1236-10
TYP
PARAMETER
CONDITIONS
MIN
MAX
UNITS
Output Voltage (Note 1)
LT1236A-10
LT1236B-10/LT1236C-10
9.995
9.990
10.000 10.005
10.000 10.010
V
V
Output Voltage Temperature Coefficient (Note 2)
Line Regulation (Note 3)
T
≤ T ≤ T
MIN J MAX
LT1236A-10
LT1236B-10
LT1236C-10
2
5
10
5
10
15
ppm/°C
ppm/°C
ppm/°C
11.5V ≤ V ≤ 14.5V
1.0
4
6
2
4
ppm/V
ppm/V
ppm/V
ppm/V
IN
●
●
14.5V ≤ V ≤ 40V
0.5
IN
Load Regulation (Sourcing Current)
(Note 3)
0 ≤ I
≤ 10mA
12
50
25
40
ppm/mA
ppm/mA
OUT
●
●
●
●
Load Regulation (Shunt Mode)
(Notes 3, 4)
1.7mA ≤ I
≤ 10mA
100
150
ppm/mA
ppm/mA
SHUNT
Series Mode Supply Current
Shunt Mode Minimum Current
Output Voltage Noise (Note 5)
1.2
1.1
1.7
2.0
mA
mA
V
is Open
1.5
1.7
mA
mA
IN
0.1Hz ≤ f ≤ 10Hz
10Hz ≤ f ≤ 1kHz
6.0
3.5
µV
P-P
6
µV
RMS
Long-Term Stablility of Output Voltage (Note 6)
Temperature Hysteresis of Output (Note 7)
∆t = 1000Hrs Non-Cumulative
∆T = ±25°C
30
5
ppm
ppm
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
range.
●
denotes specifications which apply over the specified temperature
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.
3
LT1236
ELECTRICAL CHARACTERISTICS
VIN = 15V, IOUT = 0, TA = 25°C, unless otherwise noted.
temperature. Output voltage is always measured at 25°C, but the IC is
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.
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.
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
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Minimum Input/Output
Differential, LT1236-10
Ripple Rejection
Ripple Rejection
130
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
115
110
105
100
95
V
C
= 15V
OUT
f = 150Hz
T
= 125 °C
IN
J
= 0
120
110
100
90
T
= –55 °C
J
LT1236-10
LT1236-5
LT1236-10
T
= 25 °C
J
LT1236-5
80
70
90
60
50
85
25 30
10 15 20
INPUT VOLTAGE (V)
0
5
35 40
10
100
1k
10k
0
2
4
10 12 14 16 18 20
6
8
FREQUENCY (Hz)
OUTPUT CURRENT (mA)
LT1236 G02
LT1236 G01
LT1236 G03
Start-Up (Series Mode)
Start-Up (Shunt Mode), LT1236-10
Output Voltage Noise Spectrum
13
12
11
10
9
11
10
9
400
350
300
250
200
150
100
50
V
IN
= 0V TO 12V
LT1236-10
LT1236-10
1k
V
OUT
0V
+ 2V
V
OUT
8
OUT
IN
GND
8
NC
7
LT1236-10
LT1236-5
7
6
5
6
LT1236-5
5
4
0
3
12
14
6
10
12
1M
0
2
4
6
8
10
0
2
4
8
10
100
1k
FREQUENCY (Hz)
TIME (µs)
TIME (µs)
LT1236 G06
LT1236 G04
LT1236 G05
4
LT1236
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Output Voltage Temperature Drift
LT1236-5
Output Voltage Noise
Load Regulation LT1236-5
5.005
5.004
5.003
5.002
5.001
5.000
16
14
12
10
8
5
4
C
= 0
V
= 8V
OUT
FILTER = 1 POLE
= 0.1Hz
IN
f
LOW
3
2
1
0
–1
– 2
– 3
– 4
– 5
6
LT1236-10
LT1236-5
4
2
0
10
100
1k
10k
–40
0
20
40
60
100
–20
80
–10 –8 – 6 – 4 – 2
SOURCING
0
2
4
6
8
10
TEMPERATURE (°C)
BANDWIDTH (Hz)
SINKING
LT1236 G07
LT1236 G08
OUTPUT CURRENT (mA)
LT1236 G09
Sink Mode* Current Limit,
LT1236-5
Quiescent Current, LT1236-5
Thermal Regulation, LT1236-5
1.8
60
50
I
= 0
V
IN
= 8V
V
= 25V
OUT
IN
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
∆POWER = 200mW
LOAD
REGULATION
0
– 0.5
–1.0
40
T
= – 55°C
J
THERMAL
REGULATION*
30
20
T
= 25°C
J
T
= 125°C
J
I
= 10mA
LOAD
10
0
0
60 80
TIME (ms)
0
20 40
100 120 140
0
5
10 15 20 25
INPUT VOLTAGE (V)
40
0
2
4
6
8
10 12 14 16 18
30 35
OUTPUT VOLTAGE (V)
LT1236 G10
*NOTE THAT AN INPUT VOLTAGE IS REQUIRED
*INDEPENDENT OF TEMPERATURE COEFFICIENT
FOR 5V UNITS.
LT1236 G12
LT1236 G11
Load Transient Response,
LT1236-5, CLOAD = 0
Load Transient Response,
LT1236-5, CLOAD = 1000pF
Output Noise 0.1Hz to 10Hz,
LT1236-5
FILTERING = 1 ZERO AT 0.1Hz
2 POLES AT 10Hz
I
= 0
I
= 0
SINK
SOURCE
I
= 0
I
= 0
SOURCE
SINK
5µV (1ppm)
50mV
50mV
20mV
20mV
I
= 0.2mA
I
= 0.2mA
SINK
I
= 0.2mA
SINK
SOURCE
I
= 0.5mA
SOURCE
I
= 2-10mA
SINK
I
= 2-10mA
I
= 2-10mA
SINK
SOURCE
I
= 2-10mA
SOURCE
∆I
= 100µA
∆I
= 100µA
SOURCE P-P
∆I
SINK
= 100µA
∆I
SINK
= 100µA
P-P
SOURCE
P-P
P-P
4
6
0
1
2
3
4
0
1
2
3
4
0
5
10 15 20
0
5
10 15 20
0
1
2
3
5
TIME (µs)
TIME (µs)
TIME (MINUTES)
LT1236 G13
LT1236 G14
LT1236 G15
5
LT1236
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Output Voltage Temperature
Drift, LT1236-10
Load Regulation, LT1236-10
Input Supply Current, LT1236-10
10.0020
10.0015
10.0010
10.0005
10.0000
9.9995
5
4
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
V
= 12V
I
= 0
OUT
IN
T = – 55°C
J
3
T = 25°C
J
2
T = 125°C
J
1
0
–1
– 2
– 3
– 4
– 5
9.9990
9.9985
9.9980
0
–40 –20
0
20
40
60
80 100
–10 –8 – 6 – 4 – 2
SOURCING
0
2
4
6
8
10
0
5
10 15 20 25
INPUT VOLTAGE (V)
40
30 35
TEMPERATURE (˚C)
SINKING
LT1236 G16
OUTPUT CURRENT (mA)
LT1236 G17
LT1236 G18
Shunt Mode Current Limit,
LT1236-10
Shunt Characteristics, LT1236-10
Thermal Regulation, LT1236-10
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
60
50
INPUT PIN OPEN
INPUT PIN OPEN
V
= 30V
IN
∆POWER = 200mW
LOAD
0
REGULATION
40
–0.5
–1.0
–1.5
T = – 55°C
J
30
20
THERMAL
REGULATION*
T = 25°C
J
I
= 10mA
LOAD
T = 125°C
10
0
J
0
60 80
TIME (ms)
0
20 40
100 120 140
0
2
4
6
8
10 12 14 16 18
0
2
4
6
10
12
8
OUTPUT VOLTAGE (V)
OUTPUT TO GROUND VOLTAGE (V)
LT1236 G20
LT1236 G19
*INDEPENDENT OF TEMPERATURE COEFFICIENT
LT1236 G21
Load Transient Response,
LT1236-10, CLOAD = 0
Output Noise 0.1Hz to 10Hz,
LT1236-10
Load Transient Response,
LT1236-10, CLOAD = 1000pF
FILTERING = 1 ZERO AT 0.1Hz
2 POLES AT 10Hz
I
= 0.8mA
I
= 0.6mA
SINK
SINK
I
= 0
I
= 0
SOURCE
SOURCE
5mV
20mV
50mV
10µV (1ppm)
10mV
I
= 1.2mA
SINK
I
= 0.8mA
SINK
I
= 0.2mA
SOURCE
I
I
= 0.5mA
SOURCE
I
I
= 1.4mA
I
= 1.0mA
SINK
SINK
= 2-10mA
I
= 2-10mA
= 2-10mA
SOURCE
SINK
SOURCE
I
= 2-10mA
SINK
∆I
= 100µA
P-P
∆I
= 100µA
∆I
= 100µA
P-P
∆I
= 100µA
P-P
SOURCE
SOURCE
P-P
SINK
SINK
1
0
1
2
3
4
0
1
2
3
4
0
1
2
3
4
0
2
3
4
4
6
0
1
2
3
5
TIME (µs)
TIME (µs)
TIME (MINUTES)
NOTE VERTICAL SCALE CHANGE
NOTE VERTICAL SCALE CHANGE
LT1236 G24
BETWEEN SOURCING AND SINKING
BETWEEN SOURCING AND SINKING
LT1236 G23
LT1236 G22
6
LT1236
U
W U U
APPLICATIONS INFORMATION
Effect of Reference Drift on System Accuracy
in series with a 20kΩ potentiometer will give ±10mV trim
range. Effect on the output TC will be only 1ppm/°C for the
±5mV trim needed to set the “A” device to 10.000V.
A large portion of the temperature drift error budget in
many systems is the system reference voltage. This graph
indicates the maximum temperature coefficient allowable
if the reference is to contribute no more than 0.5LSB error
to the overall system performance. The example shown is
a 12-bit system designed to operate over a temperature
range from 25°C to 65°C. Assuming the system calibra-
tion is performed at 25°C, the temperature span is 40°C.
It can be seen from the graph that the temperature coeffi-
cient of the reference must be no worse than 3ppm/°C if
it is to contribute less than 0.5LBS error. For this reason,
the LT1236 family has been optimized for low drift.
LT1236-5
The LT1236-5 does have an output voltage trim pin, but
the TC of the nominal 4V open circuit voltage at pin 5 is
about –1.7mV/°C. For the voltage trimming not to affect
reference output TC, the external trim voltage must track
thevoltageonthetrimpin. Inputimpedanceofthetrimpin
is about 100kΩ and attenuation to the output is 13:1. The
technique shown below is suggested for trimming the
output of the LT1236-5 while maintaining minimum shift
in output temperature coefficient. The R1/R2 ratio is
chosen to minimize interaction of trimming and TC shifts,
so the exact values shown should be used.
Maximum Allowable Reference Drift
100
8-BIT
LT1236-5
V
IN
GND TRIM
10-BIT
OUT
OUT
10
R1
27k
R2
50k
12-BIT
14-BIT
1N4148
LT1236 AI02
1.0
10 20
40
60 70 80
100
90
30
50
TEMPERATURE SPAN (°C)
Capacitive Loading and Transient Response
LT1236 AI01
The LT1236 is stable with all capacitive loads, but for
optimum settling with load transients, output capacitance
shouldbeunder1000pF. Theoutputstageofthereference
is class AB with a fairly low idling current. This makes
transient response worse-case at light load currents.
Because of internal current drain on the output, actual
Trimming Output Voltage
TheLT1236-10hasatrimpinforadjustingoutputvoltage.
The impedance of the trim pin is about 12kΩ with a
nominal open circuit voltage of 5V. It is designed to be
driven from a source impedance of 3kΩ or less to mini-
mize changes in the LT1236 TC with output trimming.
Attenuation between the trim pin and the output is 70:1.
This allows ±70mV trim range when the trim pin is tied to
the wiper of a potentiometer connected between the
output and ground. A 10kΩ potentiometer is recom-
mended, preferably a 20 turn cermet type with stable
characteristics over time and temperature.
worst-case occurs at ILOAD = 0 on LT1236-5 and ILOAD
=
1.4mA (sinking) on LT1236-10. Significantly better load
transient response is obtained by moving slightly away
from these points. See Load Transient Response curves
for details. In general, best transient response is obtained
when the output is sourcing current. In critical applica-
tions, a 10µF solid tantalum capacitor with several ohms
in series provides optimum output bypass.
The LT1236-10 “A” version is pre-trimmed to ±5mV and
therefore can utilize a restricted trim range. A 75k resistor
7
LT1236
U
W U U
APPLICATIONS INFORMATION
Kelvin Connections
temperature gradients in the package leads. Variations in
thermal resistance, caused by uneven air flow, create
differential lead temperatures, thereby causing thermo-
electric voltage noise at the output of the reference.
Although the LT1236 does not have true force/sense
capabilityatitsoutputs,significantimprovementsinground
loop and line loss problems can be achieved with proper
hook-up. In series mode operation, the ground pin of the
LT1236 carries only ≈ 1mA and can be used as a sense
line, greatly reducing ground loop and loss problems on
the low side of the reference. The high side supplies load
current so line resistance must be kept low. Twelve feet of
#22 gauge hook-up wire or 1 foot of 0.025 inch printed
circuit trace will create 2mV loss at 10mA output current.
This is equivalent to 1LSB in a 10V, 12-bit system.
Standard Series Mode
LT1236
KEEP THIS LINE RESISTANCE LOW
INPUT
IN
OUT
+
GND
LOAD
GROUND
RETURN
The following circuits show proper hook-up to minimize
errors due to ground loops and line losses. Losses in the
output lead can be greatly reduced by adding a PNP boost
transistor if load currents are 5mA or higher. R2 can be
added to further reduce current in the output sense lead.
LT1236 AI03
Series Mode with Boost Transistor
INPUT
R1
220Ω
2N3906
Effects of Air Movement on Low Frequency Noise
IN
TheLT1236hasverylownoisebecauseoftheburiedzener
usedinitsdesign.Inthe0.1Hzto10Hzband,peak-to-peak
noise is about 0.5ppm of the DC output. To achieve this
low noise, however, care must be taken to shield the
reference from ambient air turbulence. Air movement can
create noise because of thermoelectric differences be-
tweenICpackageleadsandprintedcircuitboardmaterials
and/or sockets. Power dissipation in the reference, even
though it rarely exceeds 20mW, is enough to cause small
LT1236
OUT
LOAD
GND
R2*
GROUND
RETURN
*OPTIONAL—REDUCES CURRENT IN OUTPUT SENSE
LEAD: R2 = 2.4k (LT1236-5), 5.6k (LT1236-10)
LT1236 AI04
U
TYPICAL APPLICATIONS
Restricted Trim Range for Improved
Resolution, 10V, “A” Version Only
LT1236-10 Full Trim Range (±0.7%)
Negative Series Reference
15V
LT1236-10
R1
LT1236-10
4.7k
LT1236A-10
V
V
OUT
IN
GND TRIM
OUT
IN
V
10.000V
IN
GND TRIM
OUT
IN
IN
OUT
D1
15V
GND
R2
4.7k
R1
75k
R1*
10k
R2
50k
–10V AT
50mA
–15V
Q1
2N2905
LT1236 TA03
LT1236 TA04
*CAN BE RAISED TO 20k FOR LESS
CRITICAL APPLICATIONS
LT1236 TA10
TRIM RANGE ≈ ±10mV
8
LT1236
U
TYPICAL APPLICATIONS
Boosted Output Current
Boosted Output Current
with Current Limit
with No Current Limit
±10V Output Reference
+
+
V
≥ (V
+ 1.8V)
V
≥ V
OUT
+ 2.8V
OUT
LT1236-10
D1*
LED
R1
220Ω
R1
220Ω
8.2Ω
15V
V
V
+10V
COM
IN
OUT
2N2905
2N2905
GND
IN
LT1236
OUT
IN
LT1236
OUT
10V AT
100mA
10V AT
100mA
LT1236-10
V
GND
+
2µF
SOLID
TANT
GND
V
IN
OUT
+
2µF
SOLID
TANT
GND
–10V
LT1236 TA05
I
–15V –10V
LOAD
*GLOWS IN CURRENT LIMIT,
DO NOT OMIT
R1=
R1
–15V
LT1236 TA06
I
+ 1.5mA
LOAD
LT1236 TA17
Handling Higher Load Currents
Operating 5V Reference from 5V Supply
15V
5V LOGIC
SUPPLY
30mA
1N914
CMOS LOGIC GATE**
≥ 2kHz*
R1*
IN
LT1236-5
1N914
169Ω
+
≈8.5V
5V
LT1236-10
f
IN
OUT
IN
REFERENCE
V
10V
+
OUT
OUT
C2*
5µF
GND
C1*
5µF
GND
TYPICAL LOAD
CURRENT = 30mA
R
L
*FOR HIGHER FREQUENCIES C1 AND C2 MAY BE DECREASED
**PARALLEL GATES FOR HIGHER REFERENCE CURRENT LOADING
LT1236 TA15
*SELECT R1 TO DELIVER TYPICAL LOAD CURRENT.
LT1236 WILL THEN SOURCE OR SINK AS NECESSARY
TO MAINTAIN PROPER OUTPUT. DO NOT REMOVE LOAD
AS OUTPUT WILL BE DRIVEN UNREGULATED HIGH. LINE
REGULATION IS DEGRADED IN THIS APPLICATION
LT1236 TA07
Trimming 10V Units to 10.24V
CMOS DAC with Low Drift Full-Scale Trimming**
LT1236-10
R3
4.02K
1%
V
IN
IN
TRIM GND
OUT
V
= 10.24V
OUT
OUT
R4*
100Ω
LT1236-10
TRIM
GND
FB
I
FULL-SCALE
ADJUST
R1
4.99k
1%
30pF
CMOS
DAC
LTC7543
4.32k
5k
OUT
–
+
10V
F.S.
REF
LT1007C
R2
40.2Ω
1%
V– = –15V*
*MUST BE WELL REGULATED
dV
1.2k
–15V
*TC LESS THAN 200ppm/°C
**NO ZERO ADJUST REQUIRED
15mV
V
OUT
=
dV–
LT1236 TA14
WITH LT1007 (V ≤ 60µV)
0S
LT1236 TA11
9
LT1236
TYPICAL APPLICATIONS
U
Negative Shunt Reference Driven
by Current Source
Strain Gauge Conditioner for 350Ω Bridge
R1
357Ω
1/2W
LT1236-10
28mA
OUT
GND
LT1236-10
28.5mA
15V
IN
OUT
5V
–10V (I
≤ 1mA)
350Ω STRAIN
GND
LOAD
R3
GAUGE BRIDGE**
2M
2.5mA
R2
20k
2
3
+
3
–
+
LM334
6
6
V
LM301A†
R4
20k
OUT
LT1012C
X100
–
2
1
R5
2M
27Ω
100pF
8
R6*
2M
–11V TO –40V
–5V
LT1236 TA13
357Ω
1/2W
–15V
**BRIDGE IS ULTRA-LINEAR WHEN ALL LEGS ARE
*THIS RESISTOR PROVIDES POSITIVE FEEDBACK TO
THE BRIDGE TO ELIMINATE LOADING EFFECT OF
ACTIVE, TWO IN COMPRESSION AND TWO IN TENSION,
OR WHEN ONE SIDE IS ACTIVE WITH ONE COMPRESSED
AND ONE TENSIONED LEG
THE AMPLIFIER. EFFECTIVE Z OF AMPLIFIER
IN
STAGE IS ≥ 1MΩ. IF R2 TO R5 ARE CHANGED,
†OFFSET AND DRIFT OF LM301A ARE VIRTUALLY
ELIMINATED BY DIFFERENTIAL CONNECTION OF LT1012C
SET R6 = R3
LT1236 TA08
2-Pole Lowpass Filtered Reference
Precision DAC Reference with System TC Trim
1µF
V
IN
MYLAR
LT1236-10
IN
15V
OUT
–
GND
8.87k
1%
V
LT1236
IN
LT1001
REF
OUT
+
V
IN
R1
36k
R2
36k
50k
ROOM TEMP
TRIM
GND
D1
TOTAL NOISE
0.5µF
MYLAR
1N457
10k
1%
≤2µV
f = 10Hz
RMS
10.36k
1%
1Hz ≤ f ≤ 10kHz
50k
TC TRIM*
1.24k
1%
200k
1%
D2
1N457
10k
1%
–V
REF
LT1236 TA12
50k
8.45k
1mA
*TRIMS 1mA REFERENCE CURRENT
TC BY ±40ppm/°C. THIS TRIM
DAC
SCHEME HAS VERY LITTLE EFFECT ON ROOM
TEMPERATURE CURRENT TO MINIMIZE ITERATIVE
TRIMMING
LT1236 TA16
10
LT1236
U
TYPICAL APPLICATIONS
Ultra-Linear Platinum Temperature Sensor*
LT1236-10
20V
IN
OUT
GND
R2*
5k
R10
182k
1%
R14
5k
R1**
253k
R11
6.65M
1%
R15
10k
R8
10M
R **
f
654k
R9
100k
R12
1k
R13
24.3k
20V
7
2
R5
200k
1%
–
+
R4
4.75k
1%
R3**
5k
6
V
=100mV/°C
OUT
LT1001
–50°C ≤ T ≤ 150°C
3
4
†
R
S
100Ω AT
0°C
–15V
R6
619k
1%
†STANDARD INDUSTRIAL 100Ω PLATINUM 4-WIRE SENSOR,
ROSEMOUNT 78S OR EQUIVALENT. α = 0.00385
TRIM R9 FOR V
TRIM R12 FOR V
TRIM R14 FOR V
R7
392k
1%
= 0V AT 0°C
= 10V AT 100°C
= 5V AT 50°C
OUT
OUT
OUT
USE TRIM SEQUENCE AS SHOWN. TRIMS ARE NONINTERACTIVE
SO THAT ONLY ONE TRIM SEQUENCE IS NORMALLY REQUIRED.
–15V
*FEEDBACK LINEARIZES OUTPUT TO ± 0.005°C FROM
–50°C TO 150°C
LT1236 TA09
**WIREWOUND RESISTORS WITH LOW TC
U
W
EQUIVALE T SCHE ATIC
INPUT
Q3
D1
D2
OUTPUT
D3
R1
Q1
+
–
A1
R2
D4
6.3V
Q2
GND
LT1236 ES
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
LT1236
U
Dimensions in inches (millimeters) unless otherwise noted.
PACKAGE DESCRIPTION
N8 Package
8-Lead Plastic DIP
0.400*
(10.160)
MAX
0.130 ± 0.005
0.300 – 0.325
0.045 – 0.065
(3.302 ± 0.127)
(1.143 – 1.651)
(7.620 – 8.255)
8
1
7
6
5
0.065
(1.651)
TYP
0.255 ± 0.015*
(6.477 ± 0.381)
0.009 – 0.015
(0.229 – 0.381)
0.125
0.015
(0.380)
MIN
(3.175)
MIN
+0.025
–0.015
0.045 ± 0.015
(1.143 ± 0.381)
2
4
3
0.325
+0.635
8.255
(
)
–0.381
0.100 ± 0.010
(2.540 ± 0.254)
0.018 ± 0.003
(0.457 ± 0.076)
N8 0395
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm).
S8 Package
8-Lead Plastic SOIC
0.189 – 0.197*
(4.801 – 5.004)
0.010 – 0.020
(0.254 – 0.508)
7
5
8
6
× 45°
0.004 – 0.010
(0.101 – 0.254)
0.053 – 0.069
(1.346 – 1.752)
0.008 – 0.010
(0.203 – 0.254)
0°– 8° TYP
0.150 – 0.157*
(3.810 – 3.988)
0.228 – 0.244
(5.791 – 6.197)
0.016 – 0.050
0.406 – 1.270
0.050
(1.270)
BSC
0.014 – 0.019
(0.355 – 0.483)
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006 INCH (0.15mm).
1
3
4
2
SO8 0294
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
LT1019
Precision Bandgap Reference
Precision 5V Reference
0.05%, 5ppm/°C
0.02%, 2ppm/°C
LT1027
LT/GP 0695 10K • PRINTED IN USA
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7487
12
●
●
(408) 432-1900 FAX: (408) 434-0507 TELEX: 499-3977
LINEAR TECHNOLOGY CORPORATION 1995
LT1236BCS8-10 CAD模型
引脚图
封装焊盘图
LT1236BCS8-10 相关器件
| 型号 | 制造商 | 描述 | 价格 | 文档 |
| LT1236BCS8-10#PBF | Linear | LT1236 - Precision Reference; Package: SO; Pins: 8; Temperature Range: 0&deg;C to 70&deg;C | 获取价格 |
|
| LT1236BCS8-10#TR | Linear | LT1236 - Precision Reference; Package: SO; Pins: 8; Temperature Range: 0&deg;C to 70&deg;C | 获取价格 |
|
| LT1236BCS8-5 | Linear | Precision Reference | 获取价格 |
|
| LT1236BCS8-5#PBF | Linear | LT1236 - Precision Reference; Package: SO; Pins: 8; Temperature Range: 0&deg;C to 70&deg;C | 获取价格 |
|
| LT1236BCS8-5#TR | Linear | LT1236 - Precision Reference; Package: SO; Pins: 8; Temperature Range: 0&deg;C to 70&deg;C | 获取价格 |
|
| LT1236BI | Linear | Precision Reference | 获取价格 |
|
| LT1236BILS8-5 | Linear | Precision, Low Noise, Low Profile Hermetic Voltage Reference | 获取价格 |
|
| LT1236BIN8-10 | Linear | Precision Reference | 获取价格 |
|
| LT1236BIN8-5 | Linear | Precision Reference | 获取价格 |
|
| LT1236BIS-10 | Linear | IC 1-OUTPUT THREE TERM VOLTAGE REFERENCE, 10 V, PDSO, Voltage Reference | 获取价格 |
|
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