ADMOS AMS124BM, AMS124AM Datasheet
Advanced AMS124
Monolithic MICROPOWER SHUNT VOLTAGE REFERENCE
Systems
FEATURES APPLICATIONS
•• Low Temperature Coefficient •• Battery Powered Systems
•• Low Output Noise •• Instrumentation
•• Operating Current 50µµA 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 50µA 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
50ppm/°C
100ppm/°C
3 LEAD SOT-23
AMS124AM
AMS124BM
TEMP. RANGE
-40 to +85°C
-40 to +85°C
PIN CONNECTIONS
3L SOT-23
(M)
3 *
21
+ -
*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
OUT
ABSOLUTE MAXIMUM RATINGS (Note 1)
Reverse Current 5mA Storage temperature
Forward Current 10mA Internal Power Dissipation (PD)
Lead Temperature SOT-23 Package 0.28W
SOT-23 packages:
Vapor phase (60 sec)
Infrared (15 sec.)
215°C
220°C
Thermal Resistance (θJA)
SOT-23 Package
ELECTRICAL CHARACTERISTICS
Electrical Characteristics at IR =500 µA and TA = +25°C unless otherwise specified.
-65°C to +150°C
410°C/W
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
Temperature Coefficient TA = Full Range
Turn-On Settling 0.1% of V
OUT
5 5
50 100
15 15
Ω
µV
rms
ppm/°C
µsec
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
= TJ = 25°C.
A
Note 3: Optimum performance is obtained at currents below 500µA.
TYPICAL APPLICATIONS
Shunt Regulator
V
S
IQ + I
R
S
V
R
I
AMS124
Q
L
I
L
I
*
-1.0V TO -12V
OUT
Precision 1µµA to 1mA Current Sources
AMS124
R1
20k
2
-
8
3
1/2
LMC6062
+
1
4
R2
1.0V TO 12V
-15V
12V
AMS124
R1
20k
2
8
1/2
LMC6062
+
I
*
OUT
1
43
R2
I
=1.2V/R2
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
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