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| 型号： | HI5767EVAL2 |
| 厂商： | Intersil |
| 文件页数： | 2/16页 |
| 文件大小： | 0K |
| 描述： | EVALUATION PLATFORM HI5767 |
| 标准包装： | 1 |
| ADC 的数量： | 1 |
| 位数： | 10 |
| 采样率（每秒）： | 60M |
| 数据接口： | 并联 |
| 输入范围： | 1 Vpp |
| 在以下条件下的电源（标准）： | 310mW @ 60MSPS |
| 工作温度： | -40°C ~ 85°C |
| 已用 IC / 零件： | HI5767 |
| 已供物品： | 板 |
Application Note 9762
External Reference Voltage Generator,
V REFOUT and V REFiN
The HI5767 has an internal reference voltage generator,
therefore no external reference voltage is required. The
range that the converter will accommodate. The
performance of the converter does not change signi?cantly
with the value of the analog input common mode voltage.
evaluation board, however, offers the ability to use the
converters’ internal reference voltage, V REFOUT , or the on
+5V
V IN +
0.5V P-P
V IN -
VDC = 4.75V
+5V
board external variable reference voltage generator.
The external variable reference voltage circuitry is
implemented using the Intersil ICL8069 low voltage, 1.2V,
FIGURE 2A.
bandgap reference (D1) sourcing a non-inverting variable
gain operational ampli?er circuit based on the Intersil
HA5127 ultra-low noise precision operational ampli?er (U1).
Potentiometer VR1 is used to adjust the output voltage level
V IN +
0.5V P-P
V IN -
0.25V < VDC < 4.75V
of this external voltage reference. With this the user is able
to observe the effects of reference voltage variations on the
converters performance. Turning VR1 in a clockwise (CW)
FIGURE 2B.
direction will decrease the external reference voltage while
turning VR1 in a counterclockwise (CCW) direction will
decrease the external reference voltage.
0V
V IN +
0.5V P-P
V IN -
VDC = 0.25V
0V
Selection of the reference voltage to be used by the
converter is accomplished by placing the P3 header jumper
across the appropriate pins. The converters’ internal
reference voltage generator, V REFOUT , must be connected
to V REFIN when using the converters internal reference and
is selected by placing the P3 header jumper across P3-2 and
P3-3. Alternately, if it is desired to use the on board external
variable reference voltage generator, selection of this option
is done by placing the P3 header jumper across P3-1 and
P3-2. See Appendix A, Board Layout for the location of the
P3 reference voltage selection header.
Analog Input
The fully differential analog input of the HI5767 A/D can be
con?gured in various ways depending on the signal source
and the required level of performance.
Differential Analog Input Con?guration
A fully differential connection (Figure 1) will yield the best
performance from the HI5767 A/D converter. Since the
HI5767 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 0.25V to 4.75V. Figure 2 illustrates
the differential analog input common mode voltage, VDC,
FIGURE 2C.
FIGURE 2. DIFFERENTIAL ANALOG INPUT COMMON MODE
VOLTAGE RANGE
A DC bias voltage source, V DC , equal to 3.0V (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 1) and with
V REFIN connected to V REFOUT , 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 at
V DC + 0.25V (V IN + - V IN - = -0.5V).
It should be noted that overdriving the analog input beyond
the ± 0.5V fullscale input voltage range will not damage the
converter as long as the overdrive voltage stays within the
converters analog supply voltages. In the event of an
overdrive condition the converter will recover within one
sample clock cycle.
V IN
V IN +
A single-ended input will give better overall system
V DC
HI5767
performance if it is ?rst converted to differential before
driving the HI5767. An RF transformer can be connected to
the HI5767 input to provide the single-ended to differential
-V IN
V IN -
conversion. The particular transformer used will depend on
the input voltage level, the impedance desired, and the input
frequency range. The transformer will tend to have a
FIGURE 1. AC COUPLED DIFFERENTIAL INPUT
3-2
bandpass response resulting in low and high frequency
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PDF描述 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| HI5780 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:10-Bit, 80 MSPS, High Speed, Low Power D/A Converter |
| HI5780-EV | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:10-Bit, 80 MSPS, High Speed, Low Power D/A Converter |
| HI5780JCQ | 制造商:Rochester Electronics LLC 功能描述:32 PQFP COMTEMP VIDEO D/A 10BIT 80MHZ - Bulk 制造商:Harris Corporation 功能描述: |
| HI5780JCQ-T | 制造商:Rochester Electronics LLC 功能描述:HI5780JCQ IN TAPE & REEL - Bulk |
| HI5800 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:12-Bit, 3MSPS, Sampling A/D Converter |
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