Cypress Semiconductor CY8C24794 Specifications download pdf (Page 54)

CY8C24094, CY8C24794

CY8C24894, CY8C24994

Document Number: 38-12018 Rev. AH Page 54 of 64

15. Document Conventions

15.1 Units of Measure

15.2 Numeric Conventions

Hexadecimal numbers are represented with all letters in uppercase with an appended lowercase ‘h’ (for example, ‘14h’ or ‘3Ah’).

Hexadecimal numbers may also be represented by a ‘0x’ prefix, the C coding convention. Binary numbers have an appended

lowercase ‘b’ (for example, ‘01010100b’ or ‘01000011b’). Numbers not indicated by an ‘h’ or ‘b’ are decimal.

Symbol Unit of Measure Symbol Unit of Measure

°C degree Celsius mV millivolt

dB decibels nA nanoampere

fF femtofarad ns nanosecond

kHz kilohertz nV nanovolt

k kilohms  ohms

MHz megahertz pA picoampere

A microampere pF picofarad

s microsecond ps picosecond

V microvolt % percent

mA milliampere rt-Hz root hertz

mm millimeter V volt

ms millisecond W watt

16. Glossary

active high 1. A logic signal having its asserted state as the logic 1 state.

2. A logic signal having the logic 1 state as the higher voltage of the two states.

analog blocks The basic programmable opamp circuits. These are SC (switched capacitor) and CT (continuous time) blocks.

These blocks can be interconnected to provide ADCs, DACs, multi-pole filters, gain stages, and much more.

analog-to-digital

(ADC)

A device that changes an analog signal to a digital signal of corresponding magnitude. Typically, an ADC converts

a voltage to a digital number. The digital-to-analog (DAC) converter performs the reverse operation.

API (Application

Programming

Interface)

A series of software routines that comprise an interface between a computer application and lower level services

and functions (for example, user modules and libraries). APIs serve as building blocks for programmers that create

software applications.

asynchronous A signal whose data is acknowledged or acted upon immediately, irrespective of any clock signal.

Bandgap

reference

A stable voltage reference design that matches the positive temperature coefficient of VT with the negative

temperature coefficient of VBE, to produce a zero temperature coefficient (ideally) reference.

bandwidth 1. The frequency range of a message or information processing system measured in hertz.

2. The width of the spectral region over which an amplifier (or absorber) has substantial gain (or loss); it is

sometimes represented more specifically as, for example, full width at half maximum.

bias 1. A systematic deviation of a value from a reference value.

2. The amount by which the average of a set of values departs from a reference value.

3. The electrical, mechanical, magnetic, or other force (field) applied to a device to establish a reference level to

operate the device.

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