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TDA8718 Datasheet(PDF) 8 Page - NXP Semiconductors

No. de pieza TDA8718
Descripción Electrónicos  8-bit high-speed analog-to-digital converter
Download  16 Pages
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Fabricante Electrónico  PHILIPS [NXP Semiconductors]
Página de inicio  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

TDA8718 Datasheet(HTML) 8 Page - NXP Semiconductors

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June 1994
8
Philips Semiconductors
Product specification
8-bit high-speed analog-to-digital converter
TDA8718
Notes to the “Characteristics”
1. Voltage offset BOTTOM (VosB) is the difference between the analog input which produces data outputs equal to 00
and the reference voltage BOTTOM (VRB) at Tamb = 25 °C. Voltage offset TOP (VosT) is the difference between
reference voltage TOP (VRT) and the analog input which produces data outputs equal to FF, at Tamb =25 °C.
2. The analog input is not internally biased. It should be externally biased between VRT and VRB levels.
3. Full-scale sine wave; fi = 4.43 MHz; fclk = 100 MHz.
4. Effective bits are obtained via a Fast Fourier Transform (FFT) treatment taking 4K acquisition points per period.
The calculation takes into account all harmonics and noise up to half of the clock frequency (NYQUIST frequency).
Conversion to signal-to-noise ratio: S/N = EB
× 6.02 + 1.76 dB.
5. TDA8718 can only withstand one or two 100K ECL loads in order to work out timings at the maximum sampling
frequency. It is recommended to minimize the printed circuit-board load by implementing the load device as close as
possible to the TDA8718.
Table 1 Output coding and input voltage (typical values; referenced to AGND.
STEP
VI
O/UF
BINARY OUTPUT BITS
D5
D4
D3
D2
D1
D0
Underflow
<−40 Ω× I
RT
1
0
00000
0
−40 Ω× IRT
0
0
00000
1
.
0
0
00001
.
.
.
.
....
.
.
.
.
.....
.
.
.
.
.....
254
.
0
111110
255
−8 Ω× IRT
0
1
11111
Overflow
>−8 Ω× IRT
1
1
11111
Fig.4 Timing diagram.
handbook, full pagewidth
sample N + 1
sample N
CLK
MSA666
sample N + 2
50 %
DATA
OF/UF
t ds
t h
50 %
DATA
N + 1
DATA
N
DATA
N - 1
DATA
N - 2
V I


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