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參數(shù)資料
| 型號： | HI5808EVAL1 |
| 廠商： | Intersil Corporation |
| 英文描述： | 12-Bit, 10 MSPS A/D Converter |
| 中文描述： | 12位，10 MSPS的A / D轉(zhuǎn)換 |
| 文件頁數(shù)： | 9/12頁 |
| 文件大?。?/td> | 115K |
| 代理商： | HI5808EVAL1 |
125
Internal Reference Generator, V
ROUT
and V
RIN
The HI5808 has an internal reference generator, therefore, no
external reference voltage is required. V
ROUT
must be
connected to V
RIN
when using the internal reference voltage.
The HI5808 can be used with an external reference. The
converter requires only one external reference voltage con-
nected to the V
RIN
pin with V
ROUT
left open.
RIN
equal to 3.5V. Internal to the
converter, two reference voltages of 1.3V and 3.3V are
generated for a fully differential input signal range of
±
2V.
In
recommended that adequate high frequency decoupling be
provided at the reference voltage input pin, V
RIN
.
order
to
minimize
overall
converter
noise,
it
is
Analog Input, Differential Connection
The analog input to the HI5808 can be configured in various
ways depending on the signal source and the required level
of performance. A fully differential connection (Figure 15) will
give the best performance for the converter.
Since the HI5808 is powered off a single +5V supply, the
analog input must be biased so it lies within the analog input
common mode voltage range of 1.0V to 4.0V. The
performance of the ADC does not change significantly with
the value of the analog input common mode voltage.
A 2.3V DC bias voltage source, V
DC
, half way between the
top and bottom internal reference voltages, is made avail-
able to the user to help simplify circuit design when using a
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.
The difference between the converter’s two internal voltage
references is 2V. For the AC coupled differential input, (Figure
15), if V
IN
is a 2V
P-P
sinewave with -V
IN
being 180 degrees out
of phase with V
IN
, then V
IN
+ is a 2V
P-P
sinewave riding on a
DC bias voltage equal to V
DC
and V
IN
- is a 2V
P-P
sinewave
riding on a DC bias voltage equal to V
DC
. Consequently, the
converter will be at positive full scale, all 1s digital data output
code, when the V
IN
+ input is at V
DC
+1V and the V
IN
- input is
at V
DC
-1V (V
IN
+-V
IN
- = 2V). Conversely, the ADC will be
at negative full scale, all 0s digital data output code, when
the V
IN
+ input is equal to V
DC
-1V and V
IN
- is at V
DC
+1V
(V
IN
+-V
IN
- = -2V). From this, the converter is seen to have
a peak-to-peak differential analog input voltage range of
±
2V.
The analog input can be DC coupled (Figure 16) as long as
the inputs are within the analog input common mode voltage
range (1.0V
≤
VDC
≤
4.0V).
The resistors, R, in Figure 16 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
TABLE 1. A/D CODE TABLE
CODE CENTER
DESCRIPTION
DIFFERENTIAL
INPUTVOLTAGE
(USING INTERNAL
REFERENCE)
OFFSET BINARY OUTPUT CODE
MSB
LSB
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
+Full Scale (+FS) -
1
/
4
LSB
+1.99976V
1
1
1
1
1
1
1
1
1
1
1
1
+FS
-
1
1
/
4
LSB
1.99878V
1
1
1
1
1
1
1
1
1
1
1
0
+
3
/
4
LSB
732.4
μ
V
1
0
0
0
0
0
0
0
0
0
0
0
-
1
/
4
LSB
-244.1
μ
V
0
1
1
1
1
1
1
1
1
1
1
1
-FS + 1
3
/
4
LSB
-1.99829V
0
0
0
0
0
0
0
0
0
0
0
1
-Full Scale (-FS) +
3
/
4
LSB
-1.99927V
0
0
0
0
0
0
0
0
0
0
0
0
The voltages listed above represent the ideal center of each offset binary output code shown.
V
IN
+
V
DC
V
IN
-
HI5808
V
IN
-
V
IN
FIGURE 15. AC COUPLED DIFFERENTIAL INPUT
V
IN
+
V
DC
V
IN
-
HI5808
V
IN
-
V
IN
R
R
C
VDC
VDC
FIGURE 16. DC COUPLED DIFFERENTIAL INPUT
HI5808
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