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ADC0801S040 Folha de dados(PDF) 8 Page - Integrated Device Technology

Nome de Peças ADC0801S040
Descrição Electrónicos  Single 8 bits ADC, up to 40 MHz
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Fabricante Electrônico  IDT [Integrated Device Technology]
Página de início  http://www.idt.com
Logo IDT - Integrated Device Technology

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3ADC0801S040_3
© IDT 2012. All rights reserved.
Product data sheet
Rev. 03 — 2 July 2012
8 of 18
Integrated Device Technology
ADC0801S040
Single 8 bits ADC, up to 40 MHz
[1]
In addition to a good layout of the digital and analog ground, it is recommended that the rise and fall times of the clock must not be less
than 1 ns.
[2]
Analog input voltages producing code 0 up to and including code 255:
a) Voffset BOTTOM is the difference between the analog input which produces data equal to 00 and the reference voltage on pin RB
(VRB) at Tamb = 25 C.
b) Voffset TOP is the difference between the reference voltage on pin RT (VRT) and the analog input which produces data outputs equal
to code 255 at Tamb = 25 C.
[3]
To ensure the optimum linearity performance of such a converter architecture the lower and upper extremities of the converter reference
resistor ladder are connected to pins RB and RT via offset resistors ROB and ROT as shown in Figure 3.
a) The current flowing into the resistor ladder is
I
VRT VRB
ROB RL ROT
++
---------------------------------------
=
and the full-scale input range at the converter, to cover code 0
to 255 is
VI
RL IL
RL
ROB RL ROT
++
---------------------------------------
VRT VRB
+

0.838
VRT VRB

==
=
b) Since RL, ROB and ROT have similar behavior with respect to process and temperature variation, the ratio
RL
ROB RL ROT
++
---------------------------------------
will be kept reasonably constant from device to device. Consequently variation of the output codes at a given input voltage depends
mainly on the difference VRT  VRB and its variation with temperature and supply voltage. When several ADCs are connected in
parallel and fed with the same reference source, the matching between each of them is optimized.
[4]
The analog bandwidth is defined as the maximum input sine wave frequency which can be applied to the device. No glitches greater
than 2 LSB, nor any significant attenuation is observed in the reconstructed signal.
[5]
The analog input settling time is the minimum time required for the input signal to be stabilized after a sharp full-scale input (square
wave signal) in order to sample the signal and obtain correct output data.
[6]
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 of the clock frequency (Nyquist frequency). Conversion to
signal-to-noise ratio: S/N = ENOB
 6.02 + 1.76 dB.
[7]
Measurement carried out using video analyzer VM700A, where video analog signal is reconstructed through a DAC.
[8]
Output data acquisition: the output data is available after the maximum delay time of td(o).
Differential phase[7]
dif
differential phase
PAL modulated ramp
-
0.25
-
deg
Timing (fclk = 40 MHz; CL = 20 pF); see Figure 4[8]
td(s)
sampling delay time
-
-
5
ns
th(o)
output hold time
5
-
-
ns
td(o)
output delay time
VDDO = 4.75 V
8
12
15
ns
VDDO = 3.15 V
8
17
20
ns
VDDO = 2.7 V
8
18
21
ns
3-state output delay times; see Figure 5
tdHZ
active HIGH to float
delay time
-
14
18
ns
tdZL
float to active LOW
delay time
-
16
20
ns
tdZH
float to active HIGH
delay time
-
16
20
ns
tdLZ
active LOW to float
delay time
-
14
18
ns
Table 6.
Characteristics …continued
VDDA = V5 to V6 = 3.3 V; VDDD = V3 to V4 = 3.3 V; VDDO = V20 to V11 = 3.3 V; VSSA, VSSD and VSSO shorted together; Vi(a)(p-p)
= 1.84 V; CL = 20 pF; Tamb = 0 C to 70 C; typical values measured at Tamb = 25 C unless otherwise specified.
Symbol
Parameter
Conditions
Min
Typ
Max
Unit


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