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參數(shù)資料
| 型號： | HI5703 |
| 廠商： | Intersil Corporation |
| 英文描述： | 10-Bit, 40 MSPS A/D Converter |
| 中文描述： | 10位，40 MSPS的A / D轉(zhuǎn)換 |
| 文件頁數(shù)： | 13/18頁 |
| 文件大?。?/td> | 181K |
| 代理商： | HI5703 |
4-13
Reference Voltage Inputs, V
REF
- and V
REF
+
The HI5703 requires two reference voltages connected to the
V
REF
pins. The HI5703 is tested with V
REF
- equal to 2V and
V
REF
+ equal to 3.25V for a fully differential input voltage
range of
±
1.25V. V
REF
+ and V
REF
- can differ from the above
voltages as long as the reference common mode voltage,
((V
REF
+ + V
REF
-)/2), does not exceed 2.625V
±
50mV and
the limits on V
REF
+ and V
REF
- are not exceeded.
In order to minimize overall converter noise it is recommended
that adequate high frequency decoupling be provided at the
reference voltage input pins, V
REF
+ and V
REF
-.
Analog Input, Differential Connection
The analog input to the HI5703 is a differential input that can
be configured in various ways depending on the signal
source and the required level of performance. A fully
differential connection (Figure 16 and Figure 17) will give the
best performance for the converter.
Since the HI5703 is powered by a single +5V analog supply,
the analog input is limited to be between ground and +5V.
For the differential input connection this implies the analog
input common mode voltage can range from 0.625V to
4.375V. The performance of the ADC does not change
significantly with the value of the analog input common
mode voltage.
A DC voltage source, V
DC
, equal to 2.8V (typical), is made
available to the user to help simplify circuit design when using
an AC coupled differential input. This low output impedance
voltage source is not designed to be a reference but makes an
excellent bias source and stays within the analog input
common mode voltage range over temperature. It has a
temperature coefficient of approximately +200ppm/
o
C.
For the AC coupled differential input (Figure 16) assume the
difference between V
REF
+, typically 3.25V, and V
REF
-,
typically 2V, is 1.25V. Fullscale is achieved when the V
IN
+
and V
IN
- inputs are 1.25V
P-P
, with V
IN
- being 180 degrees
out of phase with V
IN
+. The converter will be at positive
fullscale when the V
IN
+ input is at V
DC
+ 0.625V and V
IN
- is
at V
DC
- 0.625V (V
IN
+ - V
IN
- = 1.25V). Conversely, the
converter will be at negative full scale when the V
IN
+ input is
equal to V
DC
- 0.625V and V
IN
- is at V
DC
+ 0.625V (V
IN
+ -
V
IN
- = -1.25V).
The analog input can be DC coupled (Figure 17) as long as
the inputs are within the analog input common mode voltage
range (0.625V
≤
VDC
≤
4.375V).
The resistors, R, in Figure 17 are not absolutely necessary
but may be used as load setting resistors. A capacitor, C,
connected from V
IN
+ to V
IN
- will help filter any high
frequency noise on the inputs, also improving performance.
Values around 20pF are sufficient and can be used on AC
coupled inputs as well. Note, however, that the value of
capacitor C chosen must take into account the highest
frequency component of the analog input signal.
Analog Input, Single-Ended Connection
The configuration shown in Figure 18 may be used with a
single ended AC coupled input.
Again, assume the difference between V
REF
+, typically
3.25V, and V
REF
-, typically 2V, is 1.25V. If V
IN
is a 2.5V
P-P
sinewave, then V
IN
+ is a 2.5V
P-P
sinewave riding on a
positive voltage equal to VDC. The converter will be at
positive fullscale when V
IN
+ is at VDC + 1.25V and will be at
negative fullscale when V
IN
+ is equal to VDC - 1.25V.
Sufficient headroom must be provided such that the input
voltage never goes above +5V or below AGND. In this case,
VDC could range between 1.25V and 3.75V without a
significant change in ADC performance. The simplest way to
produce VDC is to use the V
DC
output of the HI5703.
V
IN
+
V
DC
V
IN
-
HI5703
V
IN
-V
IN
R
R
FIGURE 16. AC COUPLED DIFFERENTIAL INPUT
V
IN
+
V
DC
V
IN
-
HI5703
V
IN
-
V
IN
R
R
C
VDC
VDC
FIGURE 17. DC COUPLED DIFFERENTIAL INPUT
V
IN
+
V
IN
-
HI5703
V
IN
VDC
R
FIGURE 18. AC COUPLED SINGLE ENDED INPUT
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|---|---|
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| HI5703KCB WAF | 制造商:Harris Corporation 功能描述: |
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