參數(shù)資料
型號： ADS8330IRSAR
英文描述： LOW POWER, 16-BIT, 1-MHz, SINGLE/DUAL UNIPOLAR INPUT, ANALOG-TO-DIGITAL CONVERTERS WITH SERIAL INTERFACE
中文描述： 低功耗，16位，1兆赫，單/雙單極性輸入，模擬到數(shù)字串行接口變換器
文件頁數(shù)： 22/42頁
文件大?。?/td> 1768K
代理商： ADS8330IRSAR
www.ti.com
Device in Hold Mode
AGND
150
+IN
IN
AGND
+VA
150
4 pF
4 pF
40 pF
40 pF
Driver Amplifier Choice
The analog input to the converter needs to be driven with a low noise, op-amp like the THS4031 or OPA365. An
RC filter is recommended at the input pins to low-pass filter the noise from the source. Two resistors of 20
and
a capacitor of 470 pF are recommended. The input to the converter is a unipolar input voltage in the range 0 V
to V
ref
. The minimum -3dB bandwidth of the driving operational amplifier can be calculated to:
Bipolar to Unipolar Driver
In systems where the input is bipolar, the THS4031 can be used in the inverting configuration with an additional
DC bias applied to its + input so as to keep the input to the ADS8329/30 within its rated operating voltage range.
This configuration is also recommended when the ADS8329/30 is used in signal processing applications where
good SNR and THD performance is required. The DC bias can be derived from the REF3225 or the REF3240
reference voltage ICs. The input configuration shown in
Figure 53
is capable of delivering better than 91 dB
SNR and –96 dB THD at an input frequency of 10 kHz. In case bandpass filters are used to filter the input, care
should be taken to ensure that the signal swing at the input of the bandpass filter is small so as to keep the
distortion introduced by the filter minimal. In such cases, the gain of the circuit shown in
Figure 53
can be
increased to keep the input to the ADS8329/30 large to keep the SNR of the system high. Note that the gain of
the system from the + input to the output of the THS4031 in such a configuration is a function of the gain of the
AC signal. A resistor divider can be used to scale the output of the REF3225 or REF3240 to reduce the voltage
at the DC input to THS4031 to keep the voltage at the input of the converter within its rated operating range.
ADS8329
ADS8330
SLAS516–DECEMBER 2006
THEORY OF OPERATION (continued)
voltage, and source impedance. The current into the ADS8329/30 charges the internal capacitor array during the
sample period. After this capacitance has been fully charged, there is no further input current. The source of the
analog input voltage must be able to charge the input capacitance (45 pF) to a 16-bit settling level within the
minimum acquisition time (120 ns). When the converter goes into hold mode, the input impedance is greater
than 1 G
.
Care must be taken regarding the absolute analog input voltage. To maintain linearity of the converter, the +IN
and –IN inputs and the span [+IN – (–IN)] should be within the limits specified. Outside of these ranges,
converter linearity may not meet specifications. To minimize noise, low bandwidth input signals with low-pass
filters should be used. Care should be taken to ensure that the output impedance of the sources driving the +IN
and –IN inputs are matched. If this is not observed, the two inputs could have different settling times. This may
result in an offset error, gain error, and linearity error which change with temperature and input voltage.
Figure 51. Input Equivalent Circuit
f
3db
= (ln(2) ×(n+1))/(2
π
× t
ACQ
)
where
n
is equal to 16, the resolution of the ADC (in the case of the ADS8329/30). When t
ACQ
= 120 ns
(minimum acquisition time), the minimum bandwidth of the driving amplifier is 15.6 MHz. The bandwidth can be
relaxed if the acquisition time is increased by the application. The OPA365, OPA827, or THS4031 from Texas
Instruments are recommended. The THS4031 used in the source follower configuration to drive the converter is
shown in the typical input drive configuration,
Figure 52
.
22
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ADS8330IRSARG4 LOW POWER, 16-BIT, 1-MHz, SINGLE/DUAL UNIPOLAR INPUT, ANALOG-TO-DIGITAL CONVERTERS WITH SERIAL INTERFACE
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ADS8330IRSARG4 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 2.7V-5.5V 16 Bit 1 MSPS Serial 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
ADS8330IRSAT 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 2.7V-5.5V 16 Bit 1 MSPS Serial 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
ADS8330IRSATG4 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 2.7V-5.5V 16 Bit 1 MSPS Serial 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
ADS8331 制造商:TI 制造商全稱:Texas Instruments 功能描述:Low-Power, 16-Bit, 500kSPS, 4-/8-Channel Unipolar Input ANALOG-TO-DIGITAL CONVERTERS with Serial Interface
ADS8331_10 制造商:TI 制造商全稱:Texas Instruments 功能描述:Low-Power, 16-Bit, 500kSPS, 4-/8-Channel Unipolar Input ANALOG-TO-DIGITAL CONVERTERS with Serial Interface
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