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參數(shù)資料
| 型號(hào)： | ML2252 |
| 廠商： | Fairchild Semiconductor Corporation |
| 元件分類： | 串行ADC |
| 英文描述： | μP Compatible 8-Bit A/D Converters with 2-Channel Multiplexer(具有雙通道多路轉(zhuǎn)換器的微處理器兼容的8位A/D轉(zhuǎn)換器) |
| 中文描述： | 微處理器兼容的8位A / D轉(zhuǎn)換器，帶有2通道多路復(fù)用器（具有雙通道多路轉(zhuǎn)換器的微處理器兼容的8位的A / D轉(zhuǎn)換器） |
| 文件頁(yè)數(shù)： | 9/13頁(yè) |
| 文件大?。?/td> | 202K |
| 代理商： | ML2252 |
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ML2252, ML2259
9
1.4 REFERENCE
The voltage applied to the +V
REF
and –V
REF
inputs
defines the voltage span of the analog input (the
difference between V
INMAX
and V
INMIN
) over which the
256 possible output codes apply. The devices can be used
in either ratiometric applications or in systems requiring
absolute accuracy. The reference pins must be connected
to a voltage source capable of driving the reference input
resistance, typically 20k.
In a ratiometric system, the analog input voltage is
proportional to the voltage used for the A/D reference.
This voltage is typically the system power supply, so the
+V
REF
pin can be tied to V
CC
and –V
REF
tied to GND. This
technique relaxes the stability requirements of the system
reference as the analog input and A/D reference move
together maintaining the same output code for a given
input condition.
For absolute accuracy, where the analog input varies
between specific voltage limits, the reference pins can be
biased with a time and temperature stable voltage source.
+V
REF
and –V
REF
can be at any voltage between V
CC
and
GND. In addition, the difference between +V
REF
and
–V
REF
can be set to small values for conversions over
smaller voltage ranges. Particular care must be taken with
regard to noise pickup, circuit layout ond system error
voltage sources when operating with a reduced span due
to the increased sensitivity converter.
1.5 POWER SUPPLY AND REFERENCE DECOUPLING
A 10μF electrolytic capacitor is recommended to bypass
V
CC
to GND, using as short a lead length as possible. In
addition, with clock frequencies above 1MHz, a 0.1μF
ceramic disc capacitor should be used to bypass V
CC
to
GND.
If REF+ and REF– inputs are driven by long lines, they
should be bypassed by 0.1μF ceramic disc capacitors at
the reference input pins (pins 12, 16).
1.6 DYNAMIC PERFORMANCE
Signal-to-Noise Ratio
Signal-to-noise ratio (SNR) is the measured signal to noise
at the output of the converter. The signal is the rms
magnitude of the fundamental. Noise is the rms sum of all
the nonfundamental signals up to half the sampling
frequency. SNR is dependent on the number of
quantization levels used in the digitization process; the
more levels, the smaller the quantization noise. The
theoretical SNR for a sine wave is given by
SNR = (6.02N + 1.76)dB
where N is the number of bits. Thus for ideal 8-bit
converter, SNR = 49.92dB.
Harmonic Distortion
Harmonic distortion is the ratio of the rms sum of
harmonics to the fundamental. Total harmonic distortion
(THD) of the ML2252 and ML2259 are defined as
20
2
2
3
2
4
2
5
21/
1
log(
V
V
V
V
V
+
+
+
where V
1
is the rms amplitude of the fundamental and V
2
,
V
3
, V
4
, V
5
are the rms amplitudes of the individual
harmonics.
Figure 6. Output Spectrum
37.5
75
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
FREQUENCY (kHz)
M
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