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| 型号： | THS1230IPW |
| 厂商： | Texas Instruments |
| 文件页数： | 5/25页 |
| 文件大小： | 0K |
| 描述： | IC 12 BIT 30 MSPS A/D 28-TSSOP |
| 产品培训模块： | Data Converter Basics |
| 标准包装： | 50 |
| 位数： | 12 |
| 采样率（每秒）： | 30M |
| 数据接口： | 并联 |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 220mW |
| 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： | 28-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 28-TSSOP |
| 包装： | 管件 |
| 输入数目和类型： | 1 个差分，单极 |
| 产品目录页面： | 895 (CN2011-ZH PDF) |
| 配用： | 296-10012-ND - EVALUATION MODULE FOR THS1230 |
| 其它名称： | 296-2838-5 |
www.ti.com
SAMPLE
AND
HOLD
AIN
AIN+
+1
1
VP+
VP
REFT
REFB
ADC
CORE
Sample and Hold
Analog-to-Digital Converter
Analog Input
THS1230
RS
VS+
VS
RS
RSW
CI
VCM
_
+
_
+
R
S t
1
2f
CLK
C
I
In(256)
–R
SW
THS1230
SLAS291B – OCTOBER 2000 – REVISED MARCH 2004
Figure 15. Analog Input Signal Flow
The differential sample and hold processes AIN with respect to the voltages applied to the REFT and REFB pins,
to give a differential output (VP+) – (VP–) = VP given by:
VP = (AIN+) – ( AIN–)
No matter what operating configuration is chosen, VP is digitized against ADC reference voltages VREFT and
VREFB. The VREFT and VREFB voltages set the analog input span limits FS+ and FS–, respectively. Any voltages at
AIN greater than REFT or less than REFB causes ADC over-range, which is signaled by OVR going high when
the conversion result is output.
A first-order approximation for the equivalent analog input circuit of the THS1230 is shown in Figure 16. The
equivalent input capacitance CI is 5 pF typical. The input must charge/discharge this capacitance within the
sample period of one half of a clock cycle. When a full-scale voltage step is applied, the input source provides
the charging current through the switch resistance RSW (200 ) of S1 and quickly settles. In this case the input
impedance is low. Alternatively, when the source voltage equals the value previously stored on CI, the hold
capacitor requires no input current and the equivalent input impedance is very high.
Figure 16. Simplified Equivalent Input Circuit
To maintain the frequency performance outlined in the specifications, the total source impedance should be
limited to the following equation with fCLK = 30 MHz, CI = 5 pF, RSW = 200 :
So, for applications running at a lower fCLK, the total source resistance can increase proportionally.
13
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相关代理商/技术参数 |
参数描述 |
|---|---|
| THS1230IPWG4 | 功能描述:模数转换器 - ADC Low Power High-Speed 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 |
| THS1230IPWR | 功能描述:模数转换器 - ADC Low Power High-Speed 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 |
| THS1230IPWRG4 | 功能描述:模数转换器 - ADC Low Power High-Speed 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 |
| THS124 | 制造商:TOSHIBA 制造商全称:Toshiba Semiconductor 功能描述:HIGH STABILITY MOTOR CONTROL. DIGITAL TACHOMETER. CRANK SHAFT POSITION SENSOR. |
| THS124(TE85R,F) | 制造商:Toshiba 功能描述:Hall Effect Sensor 4-Pin 10-3C1A T/R Cut Tape |
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