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LT1027ECN8-5 [Linear]

Precision 5V Reference; 精密5V参考
LT1027ECN8-5
型号： LT1027ECN8-5
厂家： Linear    Linear
描述：

Precision 5V Reference
精密5V参考

电源电路 参考电压源 光电二极管 输出元件
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LT1027  
Precision  
5V Reference  
U
FEATURES  
DESCRIPTIO  
The LT®1027 is a precision reference with extra-low drift,  
superior accuracy, excellent line and load regulation and  
low output impedance at high frequency. This device is  
intended for use in 12- to 16-bit A-to-D and D-to-A  
systems where demanding accuracy requirements must  
be met without the use of power hungry, heated substrate  
references. The fast settling output recovers quickly from  
loadtransientssuchasthosepresentedbyA-to-Dconverter  
reference inputs. The LT1027 brings together both  
outstanding accuracy and temperature coefficient  
specifications.  
■
Very Low Drift: 2ppm/°C Max TC  
■
Pin Compatible with LT1021-5, REF-02,  
(TO-5 and PDIP Packages Only)  
Output Sources 15mA, Sinks 10mA  
Excellent Transient Response Suitable for  
A-to-D Reference Inputs  
Noise Reduction Pin  
Excellent Long Term Stability  
■
■
■
■
■
Less Than 1ppmUP-P Noise (0.1Hz to 10Hz)  
APPLICATIO S  
■
A-to-D and D-to-A Converters  
Digital Voltmeters  
Reference Standard  
The LT1027 reference is based on LTC’s proprietary  
advanced subsurface Zener bipolar process which  
eliminates noise and stability problems associated with  
surface breakdown devices.  
■
■
■
Precision Current Source  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
U
TYPICAL APPLICATIO  
Supplying VREF and VCC to the LTC®1290 12-bit ADC  
Output Voltage  
5.006  
V
CC  
S
A
CH0  
CH1  
CH2  
CH3  
CH4  
CH5  
CH6  
CH7  
CLK  
CLK  
D
OUT  
TO µC  
5.004  
5.002  
5.000  
ANALOG  
INPUTS  
D
IN  
CS  
8V TO 40V  
LTC1290  
COM  
V
IN  
4.998  
4.996  
4.994  
+
V
REF  
OUT  
+
–
REF  
LT1027  
GND  
2.2µF  
+
–
AGND  
DGND  
10k  
22µF  
V
V
TRIM  
50  
100  
–50  
–25  
0
25  
75  
TEMPERATURE (°C)  
1027 TA01  
1027 TA02  
1
LT1027  
W W W  
U
ABSOLUTE AXI U RATI GS (Note 1)  
Supply Voltage (VIN) ............................................... 40V  
Input-Output Voltage Differential ............................ 35V  
Output to Ground Voltage ......................................... 7V  
Operating Temperature Range  
LT1027C................................................ 0°C to 70°C  
LT1027M ......................................... –55°C to 125°C  
Storage Temperature Range  
V
TRIM to Ground Voltage  
Positive ................................................................ 5V  
Negative .......................................................... –0.3V  
Output Short-Circuit Duration  
All Devices....................................... –65°C to 150°C  
Lead Temperature (Soldering, 10 sec)................. 300°C  
VIN > 20V........................................................ 10 sec  
VIN ≤ 20V ................................................... Indefinite  
W
U
/O  
PACKAGE RDER I FOR ATIO  
TOP VIEW  
NC*  
8
TOP VIEW  
TOP VIEW  
NR  
1
2
3
4
8
7
6
5
V
IN  
NC*  
1
2
3
4
8
7
6
5
1
3
7
5
NC*  
NC*  
NC*  
V
NC*  
GND  
NC*  
NC*  
NC*  
V
IN  
V
2
6
V
IN  
OUT  
V
NR  
OUT  
TRIM  
V
NR  
TRIM  
V
V
OUT  
GND  
TRIM  
4
GND  
S8 PACKAGE  
N8 PACKAGE  
8-LEAD PDIP  
8-LEAD PLASTIC SO  
H PACKAGE  
8-LEAD TO-5 METAL CAN  
TJMAX = 100°C, θJA = 130°C/W  
TJMAX = 100°C, θJA = 180°C/W  
TJMAX = 150°C, θJA = 150°C/W, θJC = 45°C/W  
ORDER PART NUMBER  
ORDER PART NUMBER  
ORDER PART NUMBER  
LT1027ACH-5  
LT1027BCH-5  
LT1027CCH-5  
LT1027DCH-5  
LT1027ECH-5  
LT1027BCN8-5  
LT1027CCN8-5  
LT1027DCN8-5  
LT1027ECN8-5  
LT1027CCS8-5  
LT1027DCS8-5  
LT1027ECS8-5  
S8 PART MARKING  
1027C5  
1027D5  
1027E5  
*Connected internally. Do not connect external circuitry to these pins. Consult factory for Industrial and Military grade parts.  
ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the full operating  
temperature range otherwise specifications are at TA = 25°C. VIN = 10V, ILOAD = 0, unless otherwise specified.  
SYMBOL  
PARAMETER  
CONDITIONS  
MIN  
TYP  
MAX  
UNITS  
V
Output Voltage (Note 2)  
LT1027A  
LT1027B, C, D  
LT1027E  
4.9990  
4.9975  
4.9950  
5.000 5.0010  
5.000 5.0025  
5.000 5.0050  
V
OUT  
TCV  
Output Voltage Temperature Coefficient  
(Note 3)  
LT1027A, B  
LT1027C  
LT1027D  
LT1027E  
●
●
●
●
1
2
2
3
2
3
5
ppm/°C  
OUT  
7.5  
2
LT1027  
ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the full operating  
temperature range otherwise specifications are at TA = 25°C. VIN = 10V, ILOAD = 0, unless otherwise specified.  
SYMBOL  
PARAMETER  
CONDITIONS  
8V ≤ V ≤ 10V  
MIN  
TYP  
MAX  
UNITS  
Line Regulation (Note 4)  
6
12  
25  
ppm/V  
ppm/V  
IN  
●
●
●
●
10V ≤ V ≤ 40V  
3
6
8
ppm/V  
ppm/V  
IN  
Load Regulation (Notes 4, 6)  
Supply Current  
Sourcing Current  
–8  
–10  
–3  
30  
2.2  
6
8
ppm/mA  
ppm/mA  
0 ≤ I  
≤ 15mA  
OUT  
Sinking Current  
0 ≥ I ≥ –10mA  
50  
100  
ppm/mA  
ppm/mA  
OUT  
2.7  
3.1  
mA  
mA  
●
●
V
Adjust Range  
±30  
±50  
3
mV  
TRIM  
e
Output Noise (Note 5)  
0.1Hz ≤ f ≤ 10Hz  
10Hz ≤ f ≤ 1kHz  
H package; ∆T = 25°C  
H package  
µV  
P-P  
n
2.0  
10  
20  
6.0  
µV  
RMS  
Temperature Hysteresis  
Long Term Stability  
ppm  
ppm/month  
Note 5: RMS noise is measured with an 8-pole bandpass filter with a  
center frequency of 30Hz and a Q of 1.5. The filter output is then rectified  
and integrated for a fixed time period, resulting in an average, as opposed  
to RMS voltage. A correction factor is used to convert average to RMS.  
This value is then used to obtain RMS noise voltage in the 10Hz to 1000Hz  
frequency band. This test also screens for low frequency "popcorn" noise  
within the bandwidth of the filter. Consult factory for 100% 0.1Hz to 10Hz  
noise testing.  
Note 1: Absolute Maximum Ratings are those values beyond which the life  
of the part may be impaired.  
Note 2: Output voltage is measured immediately after turn-on. Changes  
due to chip warm-up are typically less than 0.005%.  
Note 3: Temperature coefficient is determined by the "box" method in  
which the maximum ∆V  
over the temperature range is divided by ∆T.  
OUT  
Note 4: Line and load regulation measurements are done on a pulse basis.  
Output voltage changes due to die temperature change must be taken into  
account separately. Package thermal resistance is 150°C/W for TO-5 (H),  
130°C/W for PDIP (N8), and 180°C/W for plastic SO (SO-8).  
Note 6: Devices typically exhibit a slight negative DC output impedance of  
–0.015Ω. This compensates for PC trace resistance, improving regulation  
at the load.  
U W  
TYPICAL PERFOR A CE CHARACTERISTICS  
Output Impedance vs Frequency  
Output Voltage  
Ripple Rejection  
5.006  
5.004  
5.002  
5.000  
100  
10  
1
100  
120  
110  
100  
90  
∆I = ±3mA AC  
SOURCE  
V
= 10V  
IN  
I
= 5mA  
80  
4.998  
4.996  
4.994  
70  
0.1  
60  
0.01  
50  
50  
TEMPERATURE (°C)  
100  
–50  
–25  
0
25  
75  
10  
100  
1k  
10k  
100k  
10  
100  
1k  
FREQUENCY (Hz)  
1M  
10k  
FREQUENCY (Hz)  
1027 G03  
1027 G01  
1027 G02  
3
LT1027  
TYPICAL PERFOR A CE CHARACTERISTICS  
U W  
Start-Up and Turn-Off (No Load)  
Start-Up and Turn-Off  
Quiescent Current  
2.5  
2.0  
1.5  
VOUT  
1V/DIV  
VOUT  
1V/DIV  
10V  
10V  
V
IN  
V
R
L
= 1k, C = 4.7µF  
IN  
L
1.0  
0.5  
0
1027 G04  
1027 G05  
1µs/DIV  
500µs/DIV  
20  
INPUT VOLTAGE (V)  
0
5
10 15  
25 30 35 40  
1027 G06  
Output Noise Voltage Density  
Load Regulation  
Line Regulation  
200  
500  
400  
300  
200  
100  
0
800  
180  
160  
140  
400  
0
120  
100  
–400  
–800  
–1200  
–1600  
80  
60  
40  
20  
0
–100  
–200  
–300  
C
NR  
= 0  
C
NR  
= 1µF  
–400  
–500  
24  
–10  
2
4
6
14 16  
8 10 12  
8
12 16 20  
28 32 36 40  
10  
100  
1k  
10k  
–8 –6 –4 –2  
0
Sink Source  
(mA)  
INPUT VOLTAGE (V)  
FREQUENCY (Hz)  
I
OUT  
1027 G07  
1027 G08  
1027 G09  
0.1Hz to 10Hz Output Noise  
Filtering = 1 zero at 0.1Hz  
2 poles at 10Hz  
Output Settling Time (Sinking)  
Output Settling Time (Sourcing)  
VOUT  
400µV/DIV  
AC COUPLED  
VOUT  
400µV/DIV  
AC COUPLED  
10mA  
LOAD STEP  
–10mA  
LOAD STEP  
1027 G10  
1027 G11  
1027 G12  
2µs/DIV  
1sec/DIV  
2µs/DIV  
4
LT1027  
O U  
W
U
PPLICATI  
A
S I FOR ATIO  
Effect of Reference Drift on System Accuracy  
to approximately 1.2µVRMS in a 10Hz to 1kHz bandwidth.  
Transient response is not affected by this capacitor. Start-  
up settling time will increase to several milliseconds due  
to the 7kΩ impedance looking into the NR pin. The  
capacitor must be a low leakage type. Electrolytics are not  
suitable for this application. Just 100nA leakage current  
will result in a 150ppm error in output voltage. This pin is  
themostsensitivepinonthedevice.Formaximumprotec-  
tion a guard ring is recommended. The ring should be  
driven from a resistive divider from VOUT set to 4.4V (the  
open-circuit voltage on the NR pin).  
A large portion of the temperature drift error budget in  
many systems is the system reference voltage. Figure 1  
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 0.5LSB error. For this reason,  
the LT1027 has been optimized for low drift.  
Transient Response  
The LT1027 has been optimized for transient response.  
Settling time is under 2µs when an AC-coupled 10mA load  
transient is applied to the output. The LT1027 achieves  
fast settling by using a class B NPN/PNP output stage.  
When sinking current, the device may oscillate with ca-  
pacitive loads greater than 100pF. The LT1027 is stable  
with all capacitive loads when at no DC load or when  
sourcing current, although for best settling time either no  
output bypass capactor or a 4.7µF tantalum unit is recom-  
mended. An 0.1µF ceramic output capacitor will maximize  
output ringing and is not recommended.  
100  
8-BIT  
10-BIT  
10  
12-BIT  
14-BIT  
1.0  
0
10 20  
40  
60 70 80  
TEMPERATURE SPAN (°C)  
100  
90  
30  
50  
1027 AI01  
Kelvin Connections  
Figure 1. Maximum Allowable Reference Drift  
Although the LT1027 does not have true force-sense  
capability, proper hook-up can improve line loss and  
ground loop problems significantly. Since the ground pin  
of the LT1027 carries only 2mA, it can be used as a low-  
side sense line, greatly reducing ground loop problems on  
the low side of the reference. The VOUT pin should be close  
to the load or connected via a heavy trace as the resistance  
of this trace directly affects load regulation. It is important  
to remember that a 1.22mV drop due to trace resistance is  
equivalent to a 1LSB error in a 5VFS, 12-bit system.  
Trimming Output Voltage  
The LT1027 has an adjustment pin for trimming output  
voltage. The impedance of the VADJ pin is about 20kΩ with  
an open-circuit voltage of 2.5V. A ±30mV guaranteed trim  
range is achievable by tying the VADJ pin to the wiper of a  
10k potentiometer connecting between the output and  
ground. Trimming output voltage does not affect the TC of  
the device.  
The circuits in Figures 2 and 3 illustrate proper hook-up to  
minimize errors due to ground loops and line losses.  
Lossesintheoutputleadcanbefurtherreducedbyadding  
a PNP boost transistor if load current is 5mA or higher. R2  
can be added to further reduce current in the output sense  
load.  
Noise Reduction  
The positive input of the internal scaling amplifier is  
brought out as the Noise Reduction (NR) pin. Connecting  
a 1µF Mylar capacitor between this pin and ground will  
reduce the wideband noise of the LT1027 from 2.0µVRMS  
5
LT1027  
PPLICATI  
O U  
W
U
A
S
I FOR ATIO  
INPUT  
R1  
91Ω  
KEEP THIS LINE RESISTANCE LOW  
2N4403  
IN  
LT1027 OUT  
GND  
INPUT  
+
IN  
LOAD  
LT1027 OUT  
GND  
GROUND  
RETURN  
+
R2*  
2.4k  
LOAD  
4.7µF  
1027 F02  
Figure 2. Standard Hook-Up  
GROUND  
RETURN  
1027 F03  
*OPTIONAL–REDUCES CURRENT IN OUTPUT SENSE LEAD  
Figure 3. Driving Higher Load Currents  
U
TYPICAL APPLICATIONS  
10V Reference  
10V Reference  
V
V
IN  
IN  
V
OUT  
V
IN  
IN  
+
7
8
OUT  
10.00V  
OUTPUT  
LT1097  
1µF  
1µF  
11  
LT1027  
LT1027 OUT  
GND  
–
V
5k  
LTC1043  
TRIM  
12  
13  
16  
5k*  
GND  
14  
17  
5k*  
* 0.1% METAL FILM  
1027 TA03  
0.01µF  
1027 TA04  
Operating 5V Reference from 5V Supply  
5V  
LOGIC SUPPLY  
CMOS LOGIC GATE**  
1N914  
1N914  
+
5V  
≈8.5V  
IN  
LT1027 OUT  
f
IN  
≥ 2kHz*  
REFERENCE  
C1  
5µF*  
+
C2  
5µF*  
GND  
1027 TA05  
*FOR HIGHER FREQUENCIES C1 AND C2 MAY BE DECREASED  
**PARALLEL GATES FOR HIGHER REFERENCE CURRENT LOADING  
6
LT1027  
U
W
EQUIVALE T SCHE ATIC  
V
IN  
V
V
OUT  
NR  
ADJ  
1027 ES  
OUTPUT CURRENT LIMIT AND  
BIAS CIRCUITS NOT SHOWN  
GND  
U
Dimensions in inches (millimeters) unless otherwise noted.  
H Package  
PACKAGE DESCRIPTIO  
8-Lead TO-5 Metal Can (0.230 PCD)  
(LTC DWG # 05-08-1321)  
0.335 – 0.370  
(8.509 – 9.398)  
DIA  
0.305 – 0.335  
(7.747 – 8.509)  
0.040  
(1.016)  
MAX  
0.050  
(1.270)  
MAX  
0.165 – 0.185  
(4.191 – 4.699)  
REFERENCE  
PLANE  
SEATING  
PLANE  
GAUGE  
PLANE  
0.500 – 0.750  
(12.700 – 19.050)  
0.010 – 0.045*  
(0.254 – 1.143)  
0.016 – 0.021**  
(0.406 – 0.533)  
0.027 – 0.045  
(0.686 – 1.143)  
45°TYP  
PIN 1  
0.028 – 0.034  
(0.711 – 0.864)  
0.230  
(5.842)  
TYP  
0.110 – 0.160  
*LEAD DIAMETER IS UNCONTROLLED BETWEEN THE REFERENCE PLANE  
AND 0.045" BELOW THE REFERENCE PLANE  
0.016 – 0.024  
**FOR SOLDER DIP LEAD FINISH, LEAD DIAMETER IS  
(0.406 – 0.610)  
(2.794 – 4.064)  
INSULATING  
STANDOFF  
H8 (TO-5) 0.230 PCD 1197  
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-  
tation that the interconnection of circuits as described herein will not infringe on existing patent rights.  
7
LT1027  
U
Dimensions in inches (millimeters) unless otherwise noted.  
PACKAGE DESCRIPTIO  
N8 Package  
8-Lead PDIP (Narrow 0.300)  
(LTC DWG # 05-08-1510)  
0.400*  
(10.160)  
MAX  
0.130 ± 0.005  
(3.302 ± 0.127)  
0.300 – 0.325  
(7.620 – 8.255)  
0.045 – 0.065  
(1.143 – 1.651)  
8
1
7
6
5
4
0.065  
(1.651)  
TYP  
0.255 ± 0.015*  
(6.477 ± 0.381)  
0.009 – 0.015  
(0.229 – 0.381)  
0.125  
0.020  
(0.508)  
MIN  
(3.175)  
MIN  
+0.035  
–0.015  
2
3
0.325  
0.018 ± 0.003  
0.100  
(2.54)  
BSC  
N8 1098  
+0.889  
8.255  
(0.457 ± 0.076)  
(
)
–0.381  
*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 Small Outline (Narrow 0.150)  
(LTC DWG # 05-08-1610)  
0.189 – 0.197*  
(4.801 – 5.004)  
0.010 – 0.020  
(0.254 – 0.508)  
7
5
8
6
× 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  
0.150 – 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)  
TYP  
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH  
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE  
SO8 1298  
**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD  
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE  
1
3
4
2
RELATED PARTS  
PART NUMBER  
DESCRIPTION  
COMMENTS  
LT1019  
Precision Series Bandgap Reference, 0.05%, 5ppm/°C Drift 2.5V, 4.5V, 5V, 10V Outputs; Industrial, Military Grades Available  
LT1021  
Precision Buried Zener Diode Reference,  
0.5%, 5ppm/°C Drift  
5V, 7V, 10V Outputs; 8-Pin PDIP, SO, TO-5 Packages;  
Military Grades Available  
LT1236  
LT1460  
Precision Series Reference, 0.05%, 5ppm/°C Drift  
5V, 10V Outputs; 8-Pin PDIP, SO Packages; Industrial Grade Available  
Micropower Precision Series Bandgap Reference,  
0.075%, 10ppm/°C Drift  
2.5V, 5V, 10V Outputs; 8-Pin PDIP, SO, MSOP;  
TO-92 and SOT-23 Packages  
LT1461  
LT1798  
Low Dropout 3ppm/°C Drift, 0.04% Series Reference  
2.5V, SO-8 Package  
Low Dropout, Micropower Reference  
2.5V, 3V, 4.096V, 5V, Adjustable in SO-8  
1027fb LT/TP 1299 2K REV B • PRINTED IN USA  
LINEAR TECHNOLOGY CORPORATION 1992  
LinearTechnology Corporation  
1630 McCarthy Blvd., Milpitas, CA 95035-7417  
8
●
●
(408)432-1900 FAX:(408)434-0507 www.linear-tech.com  

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SI9137

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SI9137DB

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SI9137LG

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SI9122E

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