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ADC0804S030TS Folha de dados(PDF) 9 Page - NXP Semiconductors

Nome de Peças ADC0804S030TS
Descrição Electrónicos  Single 8 bits ADC, up to 30 MHz, 40 MHz or 50 MHz
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Fabricante Electrônico  NXP [NXP Semiconductors]
Página de início  http://www.nxp.com
Logo NXP - NXP Semiconductors

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ADC0804S030_040_050_2
© NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 02 — 14 August 2008
9 of 19
NXP Semiconductors
ADC0804S030/040/050
Single 8 bits ADC, up to 30 MHz, 40 MHz or 50 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 0.5 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
and the full-scale input range at the converter, to cover code 0
to 255 is
b) Since RL, ROB and ROT have similar behavior with respect to process and temperature variation, the ratio
will be kept reasonably constant from device to device. Consequently, the 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]
[5]
The analog bandwidth is defined as the maximum input sine wave frequency which can be applied to the device. No glitches greater
than 0.5 LSB, neither any significant attenuation are observed in the reconstructed signal.
[6]
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.
Differential phase[9]
ϕ
dif
differential phase
fclk = 40 MHz;
PAL modulated ramp
-
0.4
-
deg
Timing (fclk = 40 MHz; Ci = 15 pF); see Figure 4[10]
td(s)
sampling delay time
-
3
-
ns
th(o)
output hold time
4
-
-
ns
td(o)
output delay time
VCCO = 4.75 V
-
10
13
ns
VCCO = 3.15 V
-
12
15
ns
CL
load capacitance
-
-
15
pF
3-state output delay times; see Figure 5
tdZH
float to active HIGH
delay time
-
5.5
8.5
ns
tdZL
float to active LOW
delay time
-12
15
ns
tdHZ
active HIGH to float
delay time
-19
24
ns
tdLZ
active LOW to float
delay time
-12
15
ns
Table 6.
Characteristics
VCCA = V3 to V4 = 4.75 V to 5.25 V; VCCD = V11 to V12 and V28 to V27 = 4.75 V to 5.25 V;
VCCO = V13 to V14 = 3.0 V to 5.25 V; AGND and DGND shorted together; Tamb =0 °Cto70 °C; typical values measured at
VCCA =VCCD = 5 V and VCCO = 3.3 V, Vi(a)(p-p) = 2.0 V; CL = 15 pF and Tamb =25 °C; unless otherwise specified.
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
I
V
RT
V
RB
R
OB
R
L
R
OT
++
----------------------------------------
=
V
I
R
L
I
L
×
R
L
R
OB
R
L
R
OT
++
----------------------------------------
V
RT
V
RB
+
()
×
0.852
V
RT
V
RB
()
×
==
=
R
L
R
OB
R
L
R
OT
++
----------------------------------------
E
G
V
1023
V
0
() V
ip
p
()
V
ip
p
()
---------------------------------------------------------
100
×
=


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