- 您现在的位置：买卖IC网 > PDF目录10728 > ADS1222IPWT (Texas Instruments)IC 24BIT ADC W/2CH MUX 14-TSSOP PDF资料下载
参数资料
| 型号： | ADS1222IPWT |
| 厂商： | Texas Instruments |
| 文件页数： | 3/26页 |
| 文件大小： | 0K |
| 描述： | IC 24BIT ADC W/2CH MUX 14-TSSOP |
| 产品培训模块： | Data Converter Basics |
| 视频文件： | Nuts and Bolts of the Delta-Sigma Converter |
| 标准包装： | 1 |
| 位数： | 24 |
| 采样率（每秒）： | 240 |
| 数据接口： | 串行 |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 2.25mW |
| 电压电源： | 模拟和数字 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 14-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 14-TSSOP |
| 包装： | 标准包装 |
| 输入数目和类型： | 4 个单端，单极；2 个差分，双极 |
| 其它名称： | 296-17321-6 |
ADS1222
SBAS314B APRIL 2004 REVISED JANUARY 2009
www.ti.com
11
the buffer will limit the allowable voltage range on
VREFP and VREFN during self or self gain calibration
as the reference pins must remain within the specified
input range of the buffer in order to establish proper gain
calibration.
For best performance, VREF should be VDD/2, but it can
be raised as high as VDD. When VREF exceeds VDD/2,
it is not possible to reach the full-scale digital output
value corresponding to
±2VREF, since this requires the
analog inputs to exceed the power supplies. For
example, if VREF = VDD = 5V, the positive full-scale
signal is 10V. The maximum positive input signal that
can be supplied before the ESD diodes turn on is when
AINP = 5.1V and AINN = –0.1V, resulting in VIN = 5.2V.
Therefore, it is not possible to reach the positive (or
negative) full-scale readings in this configuration. The
digital output codes are limited to approximately one
half of the entire range. For best performance, bypass
the voltage reference inputs with a 0.1
F capacitor
between VREFP and VREFN. Place the capacitor as
close as possible to the pins.
CLOCK INPUT (CLK)
This digital input supplies the system clock to the
ADS1222. The CLK frequency can be increased to
speed up the data rate. CLK must be left running during
normal operation. It may be turned off during Standby
mode to save power, but this is not required. The CLK
input may be driven with 5V logic, regardless of the VDD
voltage.
Minimize the overshoot and undershoot on CLK for the
best analog performance. A small resistor in series with
CLK (10
to 100) can often help. CLK can be
generated from a number of sources including
standalone crystal oscillators and microcontrollers.
DATA READY/DATA OUTPUT (DRDY/DOUT)
This digital output pin serves two purposes. First, it
indicates when new data is ready by going LOW.
Afterwards, on the first rising edge of SCLK, the
DRDY/DOUT pin changes function and begins to
output the conversion data, most significant bit (MSB)
first. Data is shifted out on each subsequent SCLK
rising edge. After all 24 bits have been retrieved, the pin
can be forced high with an additional SCLK. It will then
stay high until new data is ready. This is useful when
polling on the status of DRDY/DOUT to determine when
to begin data retrieval.
SERIAL CLOCK INPUT (SCLK)
This digital input shifts serial data out with each rising
edge. As with CLK, this input may be driven with 5V
logic regardless of the VDD voltage. There is hysteresis
built into this input, but care should still be taken to
ensure a clean signal. Glitches or slow-rising signals
can cause unwanted additional shifting. For this reason,
it is best to make sure the rise-and-fall times of SCLK
are less than 50ns.
FREQUENCY RESPONSE
The ADS1222 frequency response for fCLK = 2MHz is
shown in Figure 20. The frequency response repeats at
multiples of the modulator sampling frequency of
62.5kHz. The overall response is that of a low-pass filter
with a 3db cutoff frequency of 31.5Hz. As shown, the
ADS1222 does a good job attenuating out to 60kHz. For
the best resolution, limit the input bandwidth to less than
this value to keep higher frequency noise from affecting
performance. Often, a simple RC filter on the ADS1222
analog inputs is all that is needed.
Input Frequency (Hz)
Ga
in
(d
B
)
0
20
40
60
80
100
31250
62500
0
Figure 20. Frequency Response
相关PDF资料 |
PDF描述 |
|---|---|
| LM393DRE4 | IC DUAL DIFF COMPARATOR 8-SOIC |
| ADS7818EB/250 | IC 12-BIT 500KHZ A/D CONV 8-MSOP |
| MCP3428-E/ST | IC ADC 16BIT I2C PROGBL 14-TSSOP |
| MAX901ACSE+ | IC COMPARATOR VOLT 16-SOIC |
| VI-J4Y-MW-F4 | CONVERTER MOD DC/DC 3.3V 66W |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ADS1222IPWT | 制造商:Texas Instruments 功能描述:IC 24-BIT ADC 2 CH DIFF I/P MULTI |
| ADS1222IPWTG4 | 功能描述:模数转换器 - ADC 24-Bit Conv w/2-Ch Diff Input Mltplxer 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 |
| ADS1224 | 制造商:BB 制造商全称:BB 功能描述:24-Bit Analog-to-Digital Converter with 4-Channel Differential Input Multiplexer |
| ADS1224EVM | 功能描述:数据转换 IC 开发工具 ADS1224 Eval Mod RoHS:否 制造商:Texas Instruments 产品:Demonstration Kits 类型:ADC 工具用于评估:ADS130E08 接口类型:SPI 工作电源电压:- 6 V to + 6 V |
| ADS1224IPWR | 功能描述:模数转换器 - ADC 24-bit 240SPS 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 |
发布紧急采购，3分钟左右您将得到回复。