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参数资料
| 型号： | THS1207CDA |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | ADC |
| 英文描述： | 4-CH 12-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PDSO32 |
| 封装： | GREEN, PLASTIC, TSSOP-32 |
| 文件页数： | 21/32页 |
| 文件大小： | 317K |
| 代理商： | THS1207CDA |
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THS1207
SLAS284A – AUGUST 2000 – REVISED DECEMBER 2002
www.ti.com
28
SINGLE-ENDED MODE OF OPERATION
The THS1207 can be configured for single-ended operation using dc or ac-coupling. In either case, the input
of the THS1207 must be driven from an operational amplifier that does not degrade the ADC performance.
Because the THS1207 operates from a single supply 5 V, it is necessary to level-shift ground-based bipolar
signals to comply with its input requirements. This can be achieved with dc and ac-coupling.
DC-COUPLING
An operational amplifier can be configured to shift the signal level according to the analog input voltage range
of the THS1207. The analog input voltage range of the THS1207 is between 1.5 V and 3.5 V. An operational
amplifier can be used as shown in Figure 38.
Figure 38 shows an example where the analog input signal in the range between –1 V up to 1 V. This signal
is shifted by an operational amplifier to the analog input range of the THS1207 (1.5 V to 3.5 V). The operational
amplifier is configured as an inverting amplifier with a gain of –1. The required dc voltage of 1.25 V at the
noninverting input is derived from the 2.5-V output reference REFOUT of the THS1207 by using a resistor
divider. Therefore, the operational amplifier output voltage is centered at 2.5 V. The 10
F tantalum capacitor
is required for bypassing REFOUT. REFIN of the THS1207 must be connected directly to REFOUT in
single-ended mode. The use of ratio matched, thin-film resistor networks minimizes gain and offset errors.
_
+
5 V
R1
RS
3.5 V
2.5 V
1.5 V
THS1207
AINP
REFOUT
R2
1.25 V
1 V
0 V
–1 V
REFIN
+
C
10
F
Figure 38. Level-Shift for DC-Coupled Input
DIFFERENTIAL MODE OF OPERATION
For the differential mode of operation, a conversion from single-ended to differential is required. A conversion
to differential signals can be achieved by using an RF-transformer, which provides a center tap. Best
performance is achieved in differential mode.
THS1207
AINP
AINM
REFOUT
C
R
200
49.9
Mini Circuits
T4–1
+
10
F
Figure 39. Transformer Coupled Input
相关PDF资料 |
PDF描述 |
|---|---|
| THS1207IDA | 4-CH 12-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PDSO32 |
| THS1207CDAR | 4-CH 12-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PDSO32 |
| THS1207IDAR | 4-CH 12-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PDSO32 |
| THS1207IDAG4 | 4-CH 12-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PDSO32 |
| THS1207CDAG4 | 4-CH 12-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PDSO32 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| THS1207CDAG4 | 功能描述:模数转换器 - ADC 12-Bit 6MSPS Simult Sampling Quad Ch 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 |
| THS1207CDAR | 制造商:Rochester Electronics LLC 功能描述: 制造商:Texas Instruments 功能描述: |
| THS1207EVM | 制造商:Texas Instruments 功能描述:THS1207 ANALOG TO DIGITAL CONVERTER EVM - Bulk |
| THS1207IDA | 功能描述:模数转换器 - ADC 12-Bit 6MSPS Simult Sampling Quad Ch 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 |
| THS1207IDAG4 | 功能描述:模数转换器 - ADC 12-Bit 6MSPS Simult Sampling Quad Ch 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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