ADC0804S030_040_050_2

© NXP B.V. 2008. All rights reserved.

Product data sheet

Rev. 02 — 14 August 2008

10 of 19

NXP Semiconductors

ADC0804S030/040/050

Single 8 bits ADC, up to 30 MHz, 40 MHz or 50 MHz

[7]

Effective bits are obtained via a Fast Fourier transform (FFT) treatment taking 8000 acquisition points per equivalent fundamental

period. The calculation takes into account all harmonics and noise up to half the clock frequency (Nyquist frequency). Conversion to

SIgnal-to-Noise-And-Distortion (SINAD) ratio: SINAD = ENOB

× 6.02 + 1.76 dB.

[8]

Intermodulation measured relative to either tone with analog input frequencies of 4.43 MHz and 4.53 MHz. The two input signals have

the same amplitude and the total amplitude of both signals provides full-scale to the converter.

[9]

Measurement carried out using video analyzer VM700A, where the video analog signal is reconstructed through a digital-to-analog

converter.

lowest possible output load.

11. Additional information relating to Table 6

Fig 3.

Explanation of Table 6 Table note 3

014aaa555

RT

RB

RM

ROT

RL

RL

RL

RL

IL

ROB

code 255

code 0

Table 7.

Code

(V)

IR

Binary outputs D7 to D0

Two’s complement

outputs D7 to D0

Underflow

< 1.475

0

0000 0000

10 0000 00

0

1.475

1

0000 0000

10 0000 00

1

-

1

0000 0001

10 0000 01

↓

-

↓↓

↓

254

-

1

1111 1110

01 1111 10

255

3.495

1

1111 1111

01 1111 11

Overflow

> 3.495

0

1111 1111

01 1111 11