参数资料
| 型号： | HI2303EVAL1 |
| 厂商： | Intersil |
| 文件页数： | 1/14页 |
| 文件大小： | 0K |
| 描述： | EVALUATION BOARD HI2303 |
| 标准包装： | 1 |
| ADC 的数量： | 3 |
| 位数： | 8 |
| 采样率（每秒）： | 50M |
| 数据接口： | 并联 |
| 输入范围： | 2 Vpp |
| 在以下条件下的电源（标准）： | 500mW @ 50MSPS |
| 工作温度： | -40°C ~ 85°C |
| 已用 IC / 零件： | HI2303 |
| 已供物品： | 板 |
HI2303 Evaluation Board
Application Note
March 1998
AN9783.1
Introduction
The HI2303 evaluation kit can be used to examine the
performance of the HI2303 triple 8-bit analog to digital con-
verter (ADC). The evaluation board includes a buffered clock
driver, voltage reference, triple A/D converter, data latches and
triple D/A converter (DAC). Please refer to the functional block
diagram in Figure 1.
Evaluation Board
The HI2303 evaluation board is a four layer board with a lay-
out optimized for the best performance of the ADC. The opti-
mization includes segmenting the analog and digital signals
to prevent digital noise from degrading the analog-to-digital
conversion process. The physical board is divided into an
analog and digital area with supporting analog and digital
ground planes. The power supplies hook-up is detailed in
Table 1.
Included in the application note is an electrical schematic of
the evaluation board circuitry, a components layout, a com-
ponents part list and views of the various board layers that
make up the printed wiring board. Please refer to Figures 2
through 8. The user should feel free to copy the layout in
their application. Refer to the components layout and the
evaluation board electrical schematics for the following
discussions.
Table 1 lists the operational supply voltages for the evaluation
board. Single supply operation of the converter is possible but
the overall performance of the converter may degrade.
capacitors. To bias the inputs at the desired 0.5 to 2.5V
range bias tees are provided and can be set via potentiome-
ters R24, R25 and R26. In addition, jumpers JP21, JP22 and
JP23 may removed to disconnect the bias tee. Care should
be taken to ensure the inputs do not exceed the absolute
maximum ratings of the ADC.
Reference Voltage Circuit
The analog input range of the HI2303 is set by the voltage
between V RT and V RB . The voltage can either be internally
generated or for increased accuracy externally provided.
Please refer to table 2 for the appropriate jumpers on the eval-
uation board to ENSURE the internal and external reference
are not enabled at the same time to prevent permanent
damage to the HI2303.
Internal reference
The internal reference is enabled by connecting V RBS to
ANGD and V RTS to AV DD . The HI2303 will then generate
approximately 2.5V and 0.6V for V RT and V RB respectively.
An external voltage reference is also provided on the board.
External Reference
The external reference section contains two circuits which
generate the top (V RT ) and bottom (V RB ) voltages. The preci-
sion reference is derived by using the Intersil ICL7663S
programmable voltage regulator. For complete design theory
please refer to the ICL7663 datasheet. As detailed in the
datasheet, the output of the voltage regulator is defined in
Equation 1. In addition, the sense pin is used along with the
TABLE 1. EVALUATION BOARD POWER SUPPLIES
10 ?
resistors to provide short circuit protection of
POWER
NOMINAL
CURRENT
FUNCTION(S)
approximately 44mA.
SUPPLY
AVDD
VALUE
5.0V ± 5%
(TYP)
170
SUPPLIED
Analog power to ADC,
V REF = V SET ( R + R2/R1 )
(EQ. 1)
Reference and DAC.
V RT
AGND
Analog Ground
The top reference is derived by U3 and the supporting
DVDD
5.0V ± 5%
80
Digital power to ADC, Clock,
components which enables V RT to be adjusted, via the vari-
Latches and DAC.
able resistor R17, from 1.25V to approximately 2.7V. The
DGND
Analog Input
Digital Ground
nominal voltage of V RT should be set to 2.5V.
V RB
The bottom reference is derived by U4 and the supporting
The analog inputs to the HI2303 are obtained via BNC
connectors J1, J2 and J3 for A IN , B IN and C IN respectively.
The input is terminated by a 75 ? resistor and DC blocked by
components which allows V RB to be adjusted, via the variable
resistor R21, from 0V to approximately 2.5V. The nominal
voltage of V RB should be set to 0.5V.
1
1-888-INTERSIL or 321-724-7143 | Copyright
? Intersil Corporation 1999
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