ADC0808S250 NXP Semiconductors, ADC0808S250 Datasheet - Page 13

• Manufacturer Part Number: ADC0808S250
• Description: (ADC0808S125 / ADC0808S250) Single 8-bit ADC
• Manufacturer: NXP Semiconductors

NXP Semiconductors
Table 13.
V
T
V
[1]
[2]
[3]
[4]
[5]
12. Definitions
ADC0808S125_ADC0808S250_3
Product data sheet
Symbol
SFDR
IMD2
IMD3
amb
CCA
CCA
Output data acquisition: the output data is available after the maximum delay of t
The 3 dB analog bandwidth is determined by the 3 dB reduction in the reconstructed output, the input being a full-scale sine wave.
The total harmonic distortion is obtained with the addition of the first five harmonics.
The signal-to-noise ratio takes into account all harmonics above five and noise up to Nyquist frequency.
Intermodulation measured relative to either tone with analog input frequencies f
and the total amplitude of both signals provides full-scale to the converter ( 6 dB below full-scale for each input signal). IMD3 is the ratio
of the RMS value of either input tone to the RMS value of the worst case third-order intermodulation product.
= 40 C to +85 C; V
= 3.0 V to 3.6 V; V
= 3.3 V, V
Dynamic characteristics
Parameter
spurious free dynamic range
second-order intermodulation
distortion
third-order intermodulation
distortion
12.1.1 Integral non-linearity
12.1.2 Differential non-linearity
CCD
12.1 Static parameters
12.2 Dynamic parameters
= V
CCO
CCD
Integral non-linearity (INL) is defined as the deviation of the transfer function from a
best-fit straight line (linear regression computation). The INL of the code is obtained from
the equation:
where: S corresponds to the slope of the ideal straight line (code width), i corresponds to
the code value, V
Differential non-linearity (DNL) is the deviation in code width from the value of 1 LSB.
where: V
Figure 10
conforming to coherent sampling and which is digitized by the ADC under test. Coherent
sampling: (f
M and N values being relatively prime).
INL i
DNL i
i(IN)
= 1.8 V, T
= 1.65 V to 1.95 V; V
V
=
i(INN)
=
in
V
-----------------------------------------------
shows the spectrum of a single tone full-scale input sine wave of frequency f
amb
is the input voltage; i is a code value from 0 to (2
V
-------------------------------------------- -
t
in
…continued
= 2.0 V
in
/ f
= 25 C and C
i
s
i
= M / N, where M = number of cycles and N = number of samples,
–
+
in
V
1
Conditions
f
f
f
f
f
f
S
clk
clk
1
clk
1
clk
S
is the input voltage.
in
= 124 MHz; f
= 124 MHz; f
–
CCO
= 125 MHz; f
= 250 MHz; f
= 250 MHz
= 250 MHz
Rev. 03 — 24 February 2009
0.5 dB; V
ideal
V
in
= 1.65 V to 1.95 V; pins AGND1, AGND2 and DGND1 shorted together;
i
L
= 10 pF; unless otherwise specified.
I(cm)
2
2
i
i
= 126 MHz;
= 126 MHz;
= 0.95 V; V
= 78 MHz
= 125 MHz
Single 8-bit ADC, up to 125 MHz or 250 MHz
FSIN
1
d(o)
and f
= 0 V; typical values are measured at
.
2
ADC0808S125/250
. The two input signals have the same amplitude
[5]
[5]
Min
-
-
-
-
n
Typ
55
55
55
60
2).
Max
-
-
-
-
© NXP B.V. 2009. All rights reserved.
www.DataSheet4U.com
Unit
dBc
dBc
dB
dB
13 of 23
t
(1)
(2)
,