- 您现在的位置：买卖IC网 > PDF目录378278 > ADC08200CIMT (NATIONAL SEMICONDUCTOR CORP) 8-Bit, 20 MSPS to 200 MSPS, 1.05 mW/MSPS A/D Converter PDF资料下载
参数资料
| 型号： | ADC08200CIMT |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | ADC |
| 英文描述： | 8-Bit, 20 MSPS to 200 MSPS, 1.05 mW/MSPS A/D Converter |
| 中文描述： | 1-CH 8-BIT RESISTANCE LADDER ADC, PARALLEL ACCESS, PDSO24 |
| 封装： | PLASTIC, MO-153AD, TSSOP-24 |
| 文件页数： | 13/19页 |
| 文件大小： | 537K |
| 代理商： | ADC08200CIMT |
Functional Description
The ADC08200 uses a new, unique architecture that
achieves over 7 effective bits at input frequencies up to and
beyond 100 MHz.
The analog input signal that is within the voltage range set by
V
RT
and V
RB
is digitized to eight bits. Input voltages below
V
RB
will cause the output word to consist of all zeroes. Input
voltages above V
RT
will cause the output word to consist of
all ones.
Incorporating a switched capacitor bandgap, the ADC08200
exhibits a power consumption that is proportional to fre-
quency, limiting power consumption to what is needed at the
clock rate that is used. This and its excellent performance
over a wide range of clock frequencies makes it an ideal
choice as a single ADC for many 8-bit needs.
Data is acquired at the rising edge of the clock and the digital
equivalent of that data is available at the digital outputs 6
clock cycles plus t
OD
later. The ADC08200 will convert as
long as the clock signal is present. The device is in the active
state when the Power Down pin (PD) is low. When the PD
pin is high, the device is in the power down mode, where the
output pins hold the last conversion before the PD pin went
high and the device consumes just 1 mW.
Applications Information
1.0 REFERENCE INPUTS
The reference inputs V
RT
and V
RB
are the top and bottom of
the reference ladder, respectively. Input signals between
these two voltages will be digitized to 8 bits. External volt-
ages applied to the reference input pins should be within the
range specified in the Operating Ratings table (0.5V to (V
A
0.3V) for V
and 100 mV to (V
0.5V) for V
). Any
device used to drive the reference pins should be able to
source sufficient current into the V
RT
pin and sink sufficient
current from the V
RB
pin.
The reference bias circuit of
Figure 2
is very simple and the
performance is adequate for many applications. However,
circuit tolerances will lead to a wide referance voltage range.
Better reference stability can be achieved by driving the
reference pins with low impedance sources.
The circuit of
Figure 3
will allow a more accurate setting of
the reference voltages. The lower amplifier must have bipo-
lar supplies as its output voltage must go negative to force
V
RB
to any voltage below the V
BE
of the PNP transistor. Of
course, the divider resistors at the amplifier input could be
changed to suit your reference voltage needs, or the divider
can be replaced with potentiometers for precise settings.
The bottom of the ladder (V
) may simply be returned to
ground if the minimum input signal excursion is 0V. Be sure
that the driving source can source sufficient current into the
V
pin and sink enough current from the V
RB
pin to keep
these pins stable.
The LMC662 amplifier shown was chosen for its low offset
voltage and low cost.
V
RT
should always be at least 0.5V more positive than V
RB
to minimize noise.
The V
RM
pin is the center of the reference ladder and should
be bypassed to a quiet point in the analog ground plane with
a 0.1 μF capacitor. DO NOT allow this pin to float.
20017932
FIGURE 2. Simple, low component count reference biasing. Because of the ladder and external resistor tolerances,
the reference voltage can vary too much for some applications.
A
www.national.com
13
相关PDF资料 |
PDF描述 |
|---|---|
| ADC0820 | 8-Bit High Speed μP Compatible A/D Converter with Track/Hold Function(8位高速μP兼容A/D转换器带跟踪/保持功能) |
| ADC08234CIMF | IC,QUAD,UART,FIFO |
| ADC08238 | 16 A SPDT MINIATURE POWER RELAY |
| ADC08238BIN | 8-Bit 2 ms Serial I/O A/D Converters with MUX, Reference, and Track/Hold |
| ADC08238BIWM | 8-Bit 2 ms Serial I/O A/D Converters with MUX, Reference, and Track/Hold |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ADC08200CIMT/NOPB | 功能描述:模数转换器 - ADC 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 |
| ADC08200CIMTX | 功能描述:模数转换器 - ADC 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 |
| ADC08200CIMTX/HAPB | 制造商:Texas Instruments 功能描述: |
| ADC08200CIMTX/NOPB | 功能描述:模数转换器 - ADC 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 |
| ADC08200EVAL | 功能描述:BOARD EVALUATION FOR ADC08200 RoHS:否 类别:编程器，开发系统 >> 评估板 - 模数转换器 (ADC) 系列:PowerWise® 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:- ADC 的数量:1 位数:12 采样率（每秒）:94.4k 数据接口:USB 输入范围:±VREF/2 在以下条件下的电源（标准）:- 工作温度:-40°C ~ 85°C 已用 IC / 零件:MAX11645 已供物品:板，软件 |
发布紧急采购，3分钟左右您将得到回复。