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參數(shù)資料
| 型號： | THS1207IDA |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | ADC |
| 英文描述： | 4-CH 12-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PDSO32 |
| 封裝： | GREEN, PLASTIC, TSSOP-32 |
| 文件頁數(shù)： | 21/32頁 |
| 文件大小： | 317K |
| 代理商： | THS1207IDA |
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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
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參數(shù)描述 |
|---|---|
| THS1207IDAG4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 6MSPS Simult Sampling Quad Ch RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| THS12082 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:12-BIT, 8 MSPS, SIMULTANEOUS SAMPLING ANALOG-TO-DIGITAL CONVERTERS |
| THS12082CDA | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12bit 8 MSPS ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| THS12082CDAG4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12 Bit 8 MSPS Dual Ch RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| THS12082CDAR | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12 Bit 8 MSPS Dual Ch RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
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