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參數(shù)資料
| 型號： | HI5630EVAL |
| 廠商： | Intersil Corporation |
| 英文描述： | Triple 8-Bit, 80MSPS A/D Converter with Internal Voltage Reference |
| 中文描述： | 三8位，80Msps的A / D轉(zhuǎn)換器內(nèi)部電壓基準(zhǔn) |
| 文件頁數(shù)： | 9/14頁 |
| 文件大小： | 125K |
| 代理商： | HI5630EVAL |
9
DC Voltage Source, V
DC
An internal band-gap reference voltage followed by an
amplifier/buffer generates the precision +2.0V DC voltage
source to the user to help simplify circuit design. The
characteristics of the DC source is equivalent to the internal
reference.
Analog Input, Differential Connection
The analog input to the HI5630 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 (Figures 4 and 5) will deliver the best
performance from the converter.
Since the HI5630 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 0.25V to 4.75V.
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 2.0V (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 DC bias source and stays well within the analog
input common mode voltage range over temperature.
For the AC coupled differential input (Figure 4) and with
V
RIN
connected to V
ROUT
, full scale is achieved when the
V
IN
and V
IN
- input signals are 0.5V
P-P
, with -V
IN
being
180 degrees out of phase with V
IN
. The converter will be at
positive full scale when the V
IN
+ input is at V
DC
+ 0.25V
and the V
IN
- input is at V
DC
- 0.25V (V
IN
+ - V
IN
- = +0.5V).
Conversely, the converter will be at negative full scale when
the V
IN
+ input is equal to V
DC
- 0.25V and V
IN
- is equal to
V
DC
+ 0.25V (V
IN
+ - V
IN
- = -0.5V).
The analog input can be DC coupled (Figure 5) as long as
the inputs are within the analog input common mode voltage
range (0.25V
≤
VDC
≤
4.75V).
The resistors, R, in Figure 5 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 6 may be used with a
single ended AC coupled input.
Again, with V
RIN
connected to V
ROUT
, if V
IN
is a 1V
P-P
sinewave, then V
IN
+ is a 1.0V
P-P
sinewave riding on a
positive voltage equal to VDC. The converter will be at
positive full scale when V
IN
+ is at VDC + 0.5V (V
IN
+ - VIN- =
+0.5V) and will be at negative full scale when V
IN
+ is equal
to VDC - 0.5V (V
IN
+ - V
IN
- = -0.5V). Sufficient headroom
must be provided such that the input voltage never goes
above +5V or below AGND. In this case, VDC could range
between 0.5V and 4.5V without a significant change in ADC
performance. The simplest way to produce VDC is to use the
DC bias source, V
DC
, output of the HI5630.
The single ended analog input can be DC coupled (Figure 1)
as long as the input is within the analog input common mode
voltage range.
The resistor, R, in Figure 7 is not absolutely necessary but
may be used as a load setting resistor. 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.
A single ended source may give better overall system
performance if it is first converted to differential before
driving the HI5630.
V
IN
+
V
DC
V
IN
-
HI5630
V
IN+
V
IN-
R
R
FIGURE 4. AC COUPLED DIFFERENTIAL INPUT
V
IN
+
V
DC
V
IN
-
HI5630
V
IN+
V
IN-
R
R
C
VDC
VDC
FIGURE 5. DC COUPLED DIFFERENTIAL INPUT
V
IN
+
V
IN
-
HI5630
V
IN
VDC
R
FIGURE 6. AC COUPLED SINGLE ENDED INPUT
HI5630
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