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| 型号： | HI7190EVAL |
| 厂商： | Intersil |
| 文件页数： | 1/11页 |
| 文件大小： | 0K |
| 描述： | EVALUATION PLATFORM HI7190 |
| 产品培训模块： | Solutions for Industrial Control Applications |
| 标准包装： | 1 |
| ADC 的数量： | 1 |
| 位数： | 24 |
| 采样率（每秒）： | 200k |
| 数据接口： | 串行 |
| 输入范围： | ±2.5 V |
| 在以下条件下的电源（标准）： | 15mW @ 200kSPS |
| 工作温度： | -40°C ~ 85°C |
| 已用 IC / 零件： | HI7190 |
| 已供物品： | 板 |
No. AN9505
March 1995
Application Note
USING THE HI7190 EVALUATION KIT
Authors: David Jarman and John Kornblum
Evaluation Kit Description
The HI7190 evaluation kit (evaluation board and evaluation
software) can be used to evaluate the performance of the
HI7190 24-bit sigma delta analog-to-digital converter (ADC).
The evaluation board includes a reference circuit, a crystal,
an oscillator, and digital circuitry used to interface to a per-
sonal computer running the evaluation software. The board
also provides a means for the user to supply an external ref-
erence and an external clock.
HI7190 Description
The HI7190 is a 24-bit sigma delta ADC intended for use in
applications such as industrial weight scales, process con-
trols, and process measurement systems. The block dia-
gram shows that the device consists of a programmable gain
instrumentation ampli?er (PGIA), a second order sigma delta
modulator, a digital ?lter, a clock generator, and digital con-
trol and interface circuitry.
The input signal applied to the V INHI and V INLO pins comes
into the PGIA where it is gained up by a factor of 1 to 8. The
resulting signal is then passed into the oversampling second
order sigma delta modulator for A/D conversion and noise
shaping. The output of the modulator is a serial bit stream of
“1”s and “0”s whose code density is a direct indication of the
value of the input to the modulator. This bit stream is then
input to the digital ?lter where it is band limited and deci-
mated down to a lower frequency. The digital ?lter is also
used (along with the PGIA) to implement gains up to 128.
The clock generator and digital control circuits direct the
internal conversion process while the serial interface unit
provides access to the device from the outside world. For a
detailed description of the operation of the converter, please
refer to the HI7190 data sheet.
Hardware Description
The HI7190 evaluation board provides the user with a very sim-
ple way of interfacing to and evaluating the Intersil HI7190
sigma delta ADC. The board features a reference voltage gen-
erator, a crystal oscillator, and digital line drivers and receivers
for interfacing to a PC running the evaluation software. The
board consists of 4 layers with separate analog and digital
ground planes for obtaining optimum noise performance.
Layout and Power Supplies
The HI7190 evaluation board consists of 4 layers laid out to
optimize performance of the ADC. The ?gures at the end of
this document include the various layers of the board and
their layout, a list of the board components, and schematics.
Users should feel free to copy this layout for use in their
applications.
The power supplies are provided to the board via the edge
connector located at the top of the board. It is recommended
that twisted pair wires be used to connect the power sup-
plies to the connector and that analog and digital grounds be
tied together back at the power supplies. The separate sup-
plies are necessary to keep the digital noise from coupling
into the analog portions of the circuit. One of the internal lay-
ers of the board is the ground plane layer. This layer is
roughly divided in half with one half of the layer being digital
ground and the other half being analog ground. The other
internal layer is the power plane. It is divided into three sec-
tions; AV DD , AV SS , and DV DD . Nominal values for the sup-
plies are AV DD = +5V, AV SS = -5V, and DV DD = +5V. In some
cases (for instance if there is a substantial offset between
AGND and DGND) it may be necessary to tie the two
grounds together on the board. Resistors R2, R8, and R9
provide a means of connecting the two ground planes
together through a low impedance.
A prototype area is provided on the left side of the board.
This area has a small section of analog ground plane in the
center and may be useful for input signal conditioning before
the HI7190.
Reference Circuit
The reference inputs of the HI7190, V RHI and V RLO , provide
a differential reference input capability. The reference inputs
provide a high impedance dynamic load similar to the analog
inputs. For proper circuit operation these pins must be driven
by low impedance circuitry. Reference noise outside of the
band of interest will be removed by the on chip digital ?lter
but excessive reference noise inside the band of interest will
degrade performance of the HI7190.
The actual reference voltage is given by V REF = V RHI - V RLO .
The V RLO pin is hard wired to analog ground on the evalua-
tion board which means that V REF = V RHI . The nominal ref-
erence voltage for the HI7190 is 2.5V. Larger values of V REF
Copyright
? Intersil Corporation 1995
1
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| HI7190IB | 功能描述:IC ADC 24BIT PROGBL SER 20-SOIC RoHS:否 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 位数:12 采样率（每秒）:3M 数据接口:- 转换器数目:- 功率耗散（最大）:- 电压电源:- 工作温度:- 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-23-6 包装:带卷 (TR) 输入数目和类型:- |
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| HI7190IBZ-T | 功能描述:模数转换器 - ADC ADC 24BIT 10MHZ SIGMADELTA 20 IND RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
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| HI7190IPZ | 功能描述:模数转换器 - ADC W/ANNEAL ADC 24BIT 1 0HZ SIGMADELTA RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
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