Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
Advanced AMS9491
Monolithic 1.235V VOLTAGE REFERENCE
Systems
FEATURES APPLICATIONS
• ± 10 mV max. initial tolerance (A grade) • Battery Powered Systems
• Operating Current 10 µA to 20mA • Instrumentation
• Low Voltage Reference 1.235 • A/D, D/A Converters
• Max. 0.6 Ω Dynamic Impedance (A grade) • Temperature measurement
• Low Temperature Coefficient • Current sources
• Pagers
GENERAL DESCRIPTION
The AMS9491 is a two-terminal micropower band-gap voltage reference diode. It feature a very low dynamic impedance and
good temperature coefficient, operating over a 10 µA to 20mA current range. On-chip trimming is used to provide tight
voltage tolerance. Since the AMS9491 is a band-gap reference, uses only transistors and resistors, low noise and good long-
term stability result. Careful design of the AMS9491 has made the device exceptionally tolerant of capacitive loading, making
it easy to use in almost any reference application. The wide dynamic operating range allows its use with widely varying
supplies with excellent regulation. The extremely low power drain of the AMS9491 makes this reference diode useful for
micropower circuitry.
The AMS9491 can be used to make portable meters, regulators or general purpose analog circuitry with battery life
approaching shelf life. Further more, the wide operating current allows it to replace older references with a tight tolerance
part.
The AMS9491 is operating over a 0 °C to 70 °C temperature range and is available in TO-92 and SO-8 packages.
ORDERING INFORMATION :
TOL. PACKAGE TYPE OPERATING
TO-92 8 LEAD SOIC TEMPERATURE RANGE
± 10mV AMS9491AN AMS9491AS 0 to 70 ° C
± 20mV AMS9491BN AMS9491BS 0 to 70 ° C
PIN CONNECTIONS
TO-92 8L SOIC
Plastic Package (N) SO Package (S)
13
1 2
8
43
7 56
N/C N/CN/C
N/C N/C N/C
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