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參數(shù)資料
| 型號： | ADS8506I |
| 英文描述： | 12-BIT 40-KSPS LOW POWER SAMPLING ANALOG-TO-DIGITAL CONVERTER WITH INTERNAL REFERENCE AND PARALLEL/SERIAL INTERFACE |
| 中文描述： | 12位40 kSPS的低功耗采樣模擬到數(shù)字轉(zhuǎn)換的內(nèi)部基準(zhǔn)，并行/串行接口 |
| 文件頁數(shù)： | 24/28頁 |
| 文件大小： | 426K |
| 代理商： | ADS8506I |
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REFERENCE
The ADS8506 can operate with its internal 2.5-V reference or an external reference. By applying an external
reference to pin 5, the internal reference can be bypassed. The reference voltage at REF is buffered internally
with the output on CAP (pin 4).
The internal reference has an 8 ppm/
°
C drift (typical) and accounts for approximately 20% of the full-scale error
(FSE = ±0.5% for low grade, ±0.25% for high grade).
Buffer
CDAC
Internal
Reference
Z
REF
Z
CAP
CAP
(Pin 4)
REF
(Pin 5)
Z
CAP
Z
REF
PWRD 0
REFD 0
1
6 k
PWRD 0
REFD 1
1
100 M
PWRD 1
REFD 0
200
6 k
PWRD 1
REFD 1
200
100 M
REF
REF (pin 5) is an input for an external reference or the output for the internal 2.5-V reference. A 2.2-
μ
F tantalum
capacitor should be connected as close as possible to the REF pin from ground. This capacitor and the output
resistance of REF create a low-pass filter to bandlimit noise on the reference. Using a smaller value capacitor will
introduce more noise to the reference, degrading the SNR and SINAD. The REF pin should not be used to drive
external AC or DC loads, as shown in
Figure 46
.
CAP
CAP (pin 4) is the output of the internal reference buffer. A 2.2-
μ
F tantalum capacitor should be placed as close
as possible to the CAP pin from ground to provide optimum switching currents for the CDAC throughout the
conversions cycle. This capacitor also provides compensation for the output of the buffer. Using a capacitor any
smaller than 1
μ
F can cause the output buffer to oscillate and may not have sufficient charge for the CDAC.
Capacitor values larger than 2.2
μ
F have little affect on improving performance. ESR is the total equivalent series
resistance of the compensation capacitor (CAP pin). See
Figure 46
and
Figure 47
.
ADS8506
SLAS484A–SEPTEMBER 2007–REVISED OCTOBER 2007
The ADS8506 also has an internal buffer for the reference voltage.
Figure 46
shows characteristic impedances at
the input and output of the buffer with all combinations of powerdown and reference down.
Figure 46. Characteristic Impedances of the Internal Buffer
The range for the external reference is 2.3 V to 2.7 V and determines the actual LSB size. Increasing the
reference voltage increases the full-scale range and the LSB size of the converter which can improve the SNR.
24
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Copyright 2007, Texas Instruments Incorporated
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ADS8506
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ADS8506IB | 12-BIT 40-KSPS LOW POWER SAMPLING ANALOG-TO-DIGITAL CONVERTER WITH INTERNAL REFERENCE AND PARALLEL/SERIAL INTERFACE |
| ADS8506IBDW | 12-BIT 40-KSPS LOW POWER SAMPLING ANALOG-TO-DIGITAL CONVERTER WITH INTERNAL REFERENCE AND PARALLEL/SERIAL INTERFACE |
| ADS8506IBDWR | 12-BIT 40-KSPS LOW POWER SAMPLING ANALOG-TO-DIGITAL CONVERTER WITH INTERNAL REFERENCE AND PARALLEL/SERIAL INTERFACE |
| ADS8506IDW | 12-BIT 40-KSPS LOW POWER SAMPLING ANALOG-TO-DIGITAL CONVERTER WITH INTERNAL REFERENCE AND PARALLEL/SERIAL INTERFACE |
| ADS8506IDWR | 12-BIT 40-KSPS LOW POWER SAMPLING ANALOG-TO-DIGITAL CONVERTER WITH INTERNAL REFERENCE AND PARALLEL/SERIAL INTERFACE |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADS8506IB | 制造商:BB 制造商全稱:BB 功能描述:12-BIT 40-KSPS LOW POWER SAMPLING ANALOG-TO-DIGITAL CONVERTER WITH INTERNAL REFERENCE AND PARALLEL/SERIAL INTERFACE |
| ADS8506IBDW | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12B 40KSPS 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 |
| ADS8506IBDWG4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12B 80KSPS Lo Pwr Int Ref 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 |
| ADS8506IBDWR | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12B 40KSPS 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 |
| ADS8506IBDWRG4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12B 80KSPS Lo Pwr Int Ref 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 |
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