Rainbow-electronics MAX194 Manual de usuario descargar pdf (Pagina 24)

MAX194

14-Bit, 85ksps ADC with 10µA Shutdown

Spurious-Free Dynamic Range

Spurious-free dynamic range is the ratio of the funda-

mental RMS amplitude to the amplitude of the next

largest spectral component (in the frequency band

above DC and below one-half the sample rate). Usually,

this peak occurs at some harmonic of the input frequen-

cy. However, if the ADC is exceptionally linear, it may

occur only at a random peak in the ADC’s noise floor.

Transfer Function

Figures 28 and 29 show the MAX194’s transfer func-

tions. In unipolar mode, the output data is in binary for-

mat and in bipolar mode it is offset binary.

TRANSISTOR COUNT: 7966

11 . . . 111

11 . . . 110

11 . . . 101

11 . . . 100

11 . . . 011

11 . . . 010

00 . . . 110

00 . . . 101

00 . . . 100

00 . . . 011

00 . . . 010

00 . . . 001

00 . . . 000

0V V

REF

- (1LSB)

11 . . . 111

11 . . . 110

11 . . . 101

10 . . . 010

10 . . . 001

10 . . . 000

01 . . . 111

01 . . . 110

00 . . . 010

00 . . . 001

00 . . . 000

-V

REF

- (1LSB)0V

Figure 28. MAX194 Unipolar Transfer Function Figure 29. MAX194 Bipolar Transfer Function

0.1 10 100

MAX194-27

FREQUENCY (kHz)

SINAD (dB)

= 85kHz

= +25°C

10.0

11.0

10.5

11.5

12.0

12.5

13.0

14.0

13.5

0.1 1 10 100

MAX194-26

INPUT FREQUENCY (kHz)

EFFECTIVE BITS

= 85kHz

= +25°C

Figure 27. Signal-to-Noise + Distortion vs. FrequencyFigure 26. Effective Bits vs. Input Frequency

Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are

implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.

____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600

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