ADC08831 datasheet(5/32 Pages) TI1

Part #	ADC08831

Description	8-Bit Serial I/O CMOS A/D Converters with Multiplexer and Sample/Hold Function

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Manufacturer	TI1 [Texas Instruments]

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ADC08831, ADC08832

www.ti.com

SNAS015C – SEPTEMBER 1999 – REVISED MARCH 2013

Dynamic Characteristics

The following specifications apply for VCC = 5V, fCLK = 2MHz, TA= 25°C, RSOURCE = 50Ω, fIN = 45kHz, VIN = 5VP, VREF = 5V,

non-coherent 2048 samples with windowing.

Symbol

Parameter

Conditions

Typical(1)

Limits(2)

Units (Limits)

fS

Sampling Rate

ADC08831

fCLK/11

181

ksps

ADC08832

fCLK/13

(3)

153

ksps

SNR

Signal-to -Noise Ratio(4)

48.5

dB

THD

Total Harmonic Distortion(5)

−59.5

dB

SINAD

Signal-to -Noise and Distortion

48.0

dB

ENOB

Effective Number Of Bits(6)

7.7

Bits

SFDR

Spurious Free Dynamic Range

62.5

dB

(1)

Typicals are at TJ = 25°C and represent the most likely parametric norm.

(2)

Specified to TI's AOQL (Average Outgoing Quality Level).

(3)

The maximum sampling rate is slightly less than fCLK/11 if CS is reset in less than one clock period.

(4)

The signal-to-noise ratio is the ratio of the signal amplitude to the background noise level. Harmonics of the input signal are not included

in it's calculation.

(5)

The contributions from the first 6 harmonics are used in the calculation of the THD.

(6)

Effective Number Of Bits (ENOB) is calculated from the measured signal-to-noise plus distortion ratio (SINAD) using the equation ENOB

= (SINAD-1.76)/6.02.

Block Diagram

*For ADC08831 VREF pin is available, for ADC08832 DI pin is available, and VREF is tied to VCC

Pin names in parentheses refer to ADC08832

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