Date: 5/25/04
SPX385-1.2 Micropower Voltage Reference
Copyright 2004 Sipex Corporation
1
FEATURES
Low Output Voltage ................................ 1.235V
Dynamic Impedance...............................1
max
Low Temperature Coefficient........30ppm/
C (typ)
Operating Current ........................ 10
A to 20mA
Extended Temperature Range .. -40
C to +85
C
Initial Tolerance..................................1% and 2%
Pin Compatible with LM185/285/385, 1.23V
Micropower Voltage Reference
SPX385-1.2
The SPX385-1.2 is a micropower 2-terminal band-gap voltage reference with a very wide
operating current range from 10
A to 20mA that provides a stable voltage. The high stability of
this device is primarily the result of the low temperature coefficient Thin Film Resistor process and
Laser Trimming of the output voltage at the wafer level.
The SPX385-1.2 is available in a TO-92, SOIC-8 and SOT-89 package with an operating
temperature range of -40
C to 85
C. A 2.5 and 5.0 volt devices are also available - SPX385-2.5,
SPX385-5.0.
Figure 1: Block Diagram
APPLICATIONS
Portable Meter Reference
Portable Test Instruments
Battery Operated Systems
Panel Meters
1.235V
+
-
Cathode (K)
Anode (A)
DESCRIPTION
BLOCK DIAGRAM
1
2
3
4
5
6
7
8
N/C
SPX385-1.2
8 Pin nSOIC
CATHODE
N/C
N/C
N/C
N/C
N/C
ANODE
Now Available in Lead Free Packaging
Date: 5/25/04
SPX385-1.2 Micropower Voltage Reference
Copyright 2004 Sipex Corporation
2
Reverse Current (I
KA
)) ................................................................. 30mA
Forward Current (I
AK
) .................................................................. 10mA
Operating Temperature Range (T
A
) ................................. -40 to +85
C
Continuos Power Dissipation at 25
C (P
D
)
TO-92 ................................................................... 775mW
SOIC-8 ................................................................. 750mW
SOT-89 ............................................................... 1000mW
Junction Temperature (T
J
) .......................................................... 150
C
Storage Temperature (T
STG
) ............................................ - 65 to 150
C
Lead Temperature (Soldering 10 sec.), T
L
.................................. 300
C
I
IN
= 100
A, T
A
= 25
C, unless otherwise specified.
*
T
V
KA
-5
0.5
5000
0
0
0
TC in mV/C =
TC in % /C =
V
KA
(mV)
T
A
T
A
V
KA
at 25C
V
KA
x 100
(
)
TC in ppm/C =
T
A
V
KA
at 25C
V
KA
x 10
6
(
)
ppm
%
mV
Junction Temperature (
C)
0
15
30
45
60
75
90
105
27 ppm/C
0.0027 %/
C
0.033 mV/
C
Figure 2. V
REF
vs. Temperature
SPX385A-1.2
SPX385-1.2
PARAMETER
CONDITIONS
MIN.
TYP.
MAX
MIN.
TYP.
MAX.
UNIT
Reference Voltage
1.223
1.235
1.247
1.205 1.235
1.260
V
Dynamic Output
F = 20Hz
0.6
1.0
0.6
1.0
Impedance
I
R
= 100
A
Reference Voltage
10
A
I
R
20mA
10
20
10
20
mV
Change with I
R
Temperature Coefficient
Note 1
30
50
30
50
ppm/
C
Minimum Operating Current
8
10
8
10
A
Output Wideband Noise
10Hz
f
10kHz
60
60
Vrms
Operating Temperature
-40
+85
-40
+85
C
Stresses greater than those listed under ABSOLUTE MAXIMUM RAT-
INGS may cause permanent damage to the device. This is a stress rating
only and functional operation of the device at these or any other conditions
above those indicated in the operational sections of this specification is not
implied. Exposure to absolute maximum rating conditions for extended
periods may affect reliability.
Note 1. Three-point measurement guarantees the error band over the specified temperature range.
ABSOLUTE MAXIMUM RATINGS
TYPICAL THERMAL RESISTANCES
PACKAGE
0
JA
0
JA
TYPICAL
DERATING
TO-92
160
C/W
80
C/W
6.3 mW/
C
SOIC-8
175
C/W
45
C/W
5.7mW/
C
SOT-89
110
C/W
8
C/W
9.1mW/
C
ELECTRICAL CHARACTERISTICS
CALCULATING AVERAGE TEMPERATURE COEFFICIENT (TC)
Date: 5/25/04
SPX385-1.2 Micropower Voltage Reference
Copyright 2004 Sipex Corporation
3
TYPICAL PERFORMANCE CHARACTERISTICS
Figure 3. Test Circuit for V
KA
=V
REF
Figure 4. High Current Operating Characteristics
Figure 5. Reference Voltage vs. Ambient Temperature
Figure 6. Low Current Operating Characteristics
V
IN
V
KA
= V
REF
I
K
-2
-1
0
1
2
3
0
I
K
- Cathode Current (mA)
V
KA
- Cathode Voltage (V)
Temperature Range: 0
C to 85C
30
25
20
15
10
5
-5
-10
-15
-20
1.23
V
REF
- Reference Voltage (V)
T
A
- Ambient Temperature (C)
90
120
-60
-30
0
30
60
1.250
I
K
= 10mA
1.245
1.240
1.235
1.230
1.225
1.200
1.150
1.100
18
0
-1.0
0
1.5
85 C
25 C
-0 C
Temperature Range: 0
C to 85C
V
KA
- Cathode Voltage (V)
I
K
- Cathode Current (A)
0.5
1.0
12
6
-0.5
Figure 7a. Precision 1
A to 1mA Current Sink
Figure 7b. Precision 1
A to 1mA Current Source
LM312
R1
100k
+
R2
C1
150pF
7
6
4
3
2
SPX385-1.2
I
OUT
*
-1.5V to -27V
* I
OUT
= 1.23V
R2
-30V
LM312
R1
100k
+
R2
C1
150pF
7
6
4
3
2
SPX385-1.2
I
OUT
*
1.5V to 27V
* I
OUT
= 1.23V
R2
30V
Date: 5/25/04
SPX385-1.2 Micropower Voltage Reference
Copyright 2004 Sipex Corporation
4
TYPICAL PERFORMANCE CHARACTERISTICS
Figure 8. Reference from 1.5V Battery
Figure 9. Micropower Reference from 9V Battery
Figure 10. Wide Input Range Reference
Figure 11: Precision Micropower 10V Reference
3k
1.5V
SPX385-1.2
1.2V
500k
9V
SPX385-1.2
1.2V
4.3k
V
IN
= 2.3V to 30V
SPX385-1.2
OUT
1.2V
LM334
SPX385-1.2
1M
+
-
V
IN
= 15V
LM4250C
3
7
2
4
8
22M
3.5M
500k
150pF
6
10V
I
Q
20
A Standby Current
I
Q
Date: 5/25/04
SPX385-1.2 Micropower Voltage Reference
Copyright 2004 Sipex Corporation
5
PACKAGE: 8 PIN NSOIC
SEE VIEW C
TOP VIEW
8 PIN NSOIC
1
1.65
DIMENSIONS
Minimum/Maximum
(mm)
8 Pin NSOIC
(JEDEC MS-012,
AA - VARIATION)
COMMON HEIGHT DIMENSION
A
A1
A2
b
c
L
e
E1
E
L2
L1
1.35
4.90 BSC
0.40
0.31
0.51
SYMBOL
MIN NOM MAX
0.10
-
0.25
D
1.75
1.25
0.17
0.25
6.00 BSC
3.90 BSC
1.27 BSC
1.27
1.04 REF
0.25 BSC
0
5
8
15
-
-
-
-
-
-
-
e
E
E/2
E1
INDEX AREA
(D/2 X E1/2)
E1/2
D
b
1
L1
L
1
1
Seating Plane
Gauge Plane
L2
VIEW C
A
A2
A1
SEATING PLANE
SIDE VIEW
c
WITH PLATING
BASE METAL
b
CONTACT AREA
Date: 5/25/04
SPX385-1.2 Micropower Voltage Reference
Copyright 2004 Sipex Corporation
6
PACKAGE: 3 PIN TO-92
D
W
L
e1
e
b
A
S1
(2x)
E
R
DIMENSIONS
Minimum/Maximum
(mm)
3 PIN TO-92
CARSEM DWG #
TLG920001
COMMON HEIGHT DIMENSION
A
b
E
e
e1
W
S1
R
L
4.32
0.41
2.41
2.67
SYMBOL
MIN NOM MAX
0.36
-
0.51
4.95
3.30
1.14
1.40
0.56
4.45
4
4.95
6
-
-
-
-
-
-
-
12.70
15.49
-
-
-
2.16
2.41
1.14
1.52
D
3.94
3 PIN TO-92
Date: 5/25/04
SPX385-1.2 Micropower Voltage Reference
Copyright 2004 Sipex Corporation
7
PACKAGE: 3 PIN SOT-89
H
E
e
e1
D
D1
1
2
3
1.40 1.50 1.60
Dimensions in (mm)
3 PIN SOT-89
LINGSEN #
PO-SOT-004
0.36 0.42 0.48
4.40 4.50 4.60
A
b1
C
D
H
E
L
MIN NOM MAX
1.40 1.60 1.75
3.94 - 4.25
e
e1
1.0
C
5'(2x)
b
b1
b
RO.15
B'(2x)
b
0.41 0.47 0.53
0.38 0.40 0.43
D1
1.45 1.50 1.55
2.90 3.00 3.10
2.40 2.50 2.60
0.80 - 1.20
3 PIN SOT-89
Date: 5/25/04
SPX385-1.2 Micropower Voltage Reference
Copyright 2004 Sipex Corporation
8
Part Number
Accuracy
Output Voltage
Package Type
SPX385AM1-1.2
1.0%
1.235V
3-Pin SOT-89
SPX385AM1-1.2/TR
1.0%
1.235V
3-Pin SOT-89
SPX385AS-1.2
1.0%
1.235V
8-Pin NSOIC
SPX385AS-1.2/TR
1.0%
1.235V
8-Pin NSOIC
SPX385AN-1.2
1.0%
1.235V
3-Pin TO-92
SPX385AN-1.2/TR
1.0%
1.235V
3-Pin TO-92
SPX385M1-1.2
2.0%
1.235V
3-Pin SOT-89
SPX385M1-1.2/TR
2.0%
1.235V
3-Pin SOT-89
SPX385S-1.2
2.0%
1.235V
8-Pin NSOIC
SPX385S-1.2/TR
2.0%
1.235V
8-Pin NSOIC
SPX385N-1.2
2.0%
1.235V
3-Pin TO-92
SPX385N-1.2/TR
2.0%
1.235V
3-Pin TO-92
ANALOG EXCELLENCE
Sipex Corporation
Headquarters and
Sales Office:
233 Hillview Dr
Milpitas, CA 95035
TEL: (408) 934-7500
FAX: (408) 935-7600
Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume any liability arising out of the
application or use of any product or circuit described herein; neither does it convey any license under its patent rights nor the rights of others.
PINOUTS
Top View
SOT-89 (M1)
1
2
3
Bottom View
TO-92 (N)
1
3
2
N/C
ANODE
CATHODE
N/C
CATHODE
Top View
2
1
3
4
8
7
6
5
8-Pin Surface Mount (S)
CATHODE
ANODE
N/C
N/C
N/C
N/C
N/C
N/C
ANODE
ORDERING INFORMATION
/TR = Tape and Reel
Pack quantity is 2000 for TO-92; 2500 for NSOIC and SOT-89.
Available in lead free packaging. To order add "-L" suffix to part number.
Example: SPX385S-1.2/TR = standard; SPX385S-L-1.2/TR = lead free
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