Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
Advanced
AMS124
Monolithic
MICROPOWER SHUNT VOLTAGE REFERENCE
Systems
FEATURES
APPLICATIONS
Low Temperature Coefficient
Battery Powered Systems
Low Output Noise
Instrumentation
Operating Current 50
A to 4mA
Energy Management
Low Dynamic Impedance
Product Testing
Tight Output Voltage Tolerance
Precision Audio Components
Available in the sub-miniature SOT-23 Package
Data Acquisition Systems
GENERAL DESCRIPTION
The AMS124 is a two-terminal micropower band-gap voltage reference diode featuring low dynamic impedance and good
temperature coefficient, operating over a 50
A to 4mA current range. On-chip trimming is used to provide tight voltage
tolerance. Since the AMS124 band-gap reference uses only transistors and resistors, low noise and good long term stability
result. The wide dynamic operating range allows its use with widely varying supplies with excellent regulation. These voltage
references can be used to make portable meters, regulators or general purpose analog circuitry.
The AMS124 is operational in the full industrial temperature range of -40
C to 85
C and is available in small space saving
SOT-23 package.
ORDERING INFORMATION
:
MAX.
PACKAGE TYPE
OPERATING
TEMPCO
3 LEAD SOT-23
TEMP. RANGE
50ppm/
C
AMS124AM
-40 to +85
C
100ppm/
C
AMS124BM
-40 to +85
C
PIN CONNECTIONS
3L SOT-23
(M)
+
-
3 *
2
1
*This pin must be left floating
or connected to pin 2
Top View
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS124
ABSOLUTE MAXIMUM RATINGS (Note 1)
Reverse Current
5mA
Storage temperature
-65
C to +150
C
Forward Current
10mA
Internal Power Dissipation (P
D
)
Lead Temperature
SOT-23 Package
0.28W
SOT-23 packages:
Thermal Resistance (
JA
)
Vapor phase (60 sec)
215
C
SOT-23 Package
410
C/W
Infrared (15 sec.)
220
C
ELECTRICAL CHARACTERISTICS
Electrical Characteristics at I
R
=500
A and T
A
= +25C unless otherwise specified.
Parameter
Conditions
AMS124A
Min. Typ. Max.
AMS124B
Min. Typ. Max.
Units
Output Voltage
1.220
1.235
1.250
1.220
1.235
1.250
V
Output Impedance
0.6
2
0.6
2
RMS Noise Voltage
10Hz
f
10kHz
5
5
V
rms
Temperature Coefficient
T
A
= Full Range
50
100
ppm/
C
Turn-On Settling
0.1% of V
OUT
15
15
sec
Operating Current
(Note 3)
0.05
4
0.05
4
mA
Note1:
Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. For guaranteed specifications and test conditions, see the
Electrical Characteristics
.
The guaranteed specifications apply only for the test conditions listed.
Note 2:
Parameters identified with boldface type apply at temperature extremes. All other numbers apply at T
A
= T
J
= 25C.
Note 3:
Optimum performance is obtained at currents below 500
A.
TYPICAL APPLICATIONS
Shunt Regulator
Precision 1
A to 1mA Current Sources
AMS124
I
Q
I
Q
+ I
L
I
L
R
S
V
R
V
S
8
4
3
2
+
-
1/2
LMC6062
1
AMS124
R2
R1
20k
-15V
-1.0V TO -12V
I
OUT
*
I
OUT
=1.2V/R2
8
4
3
2
+
-
1/2
LMC6062
1
R2
R1
20k
12V
1.0V TO 12V
I
OUT
*
AMS124
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS124
TYPICAL PERFORMANCE CHARACTERISTICS
-40
-20
0
20
40
60
80
-0.5
+0.5
0
100
-0.1
-0.2
-0.3
-0.4
+0.4
+0.3
+0.2
+0.1
Temperature Drift for Different
Average Temperature Coefficient
TEMPERATURE ( C)
V
R
CHANGE (%)
I
R
= 150
A
0
0.4
0.8
1.2
1.6
0
80
40
Reverse Characteristics and
Minimum Operating Current
2.0
REVERSE VOLTAGE (V)
REVERSE CURRENT (
A)
20
100
0.1
1
10
100
1k
100
1k
10k
100k
Ouput Impedance vs Frequency
FREQUENCY (Hz)
NOISE (mV/
Hz)
1M
0.1
1
10
100
1k
100
1k
10k
100k
FREQUENCY (Hz)
1M
1
10
100
1k
10k
Noise Voltage vs Frequency
100k
FREQUENCY (Hz)
IMPEDANCE (
)
T
J
=25 C,
I
R
= 0.1I
R
I
R
= 150
A
IMPEDANCE (
)
Ouput Impedance vs Frequency
60
+12ppm/ C
-51ppm/ C
-22ppm/ C
I
R
= 1mA
T
J
=25 C,
I
R
= 0.1I
R
C
L
= 0
C
L
= 1
F
TANTALUM
C
L
= 1
F
TANTALUM
C
L
= 0
XC
L
XC
L
0
600
200
1000
800
T
J
=25 C
400
T
J
=25 C
I
R
= 200
A
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS124
PACKAGE DIMENSIONS
inches (millimeters) unless otherwise noted.
3 LEAD SOT-23 PLASTIC PACKAGE (M)
0.047-0.055
(1.194-1.397)
0.015-0.017
(0.381-0.432)
0.110-0.120
(2.794-3.048)
0.083-0.098
(2.108-2.489)
0.035-0.040
(0.889-1.016)
0.070-0.080
(1.778-2.032)
0.018-0.024
(0.457-0.610)
10
NOM
0.0034-0.0050
(0.086-0.127)
(SOT-23 ) AMS DRW# 051991
0.035-0.041
(0.089-1.041)
0.0005-0.0040
(0.013-0.102)
0.018-0.024
(0.457-0.610)
10
NOM
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