參數(shù)資料
型號(hào)： ADS8506IB
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(yè)數(shù)： 25/28頁(yè)
文件大小： 426K
代理商： ADS8506IB
www.ti.com
3000
0.1
4000
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7000
6000
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0
1000
1
10
100
CAP Pin Value F
P
REFERENCE AND POWER-DOWN
The ADS8506 has analog power-down and reference power down capabilities via PWRD (pin 25) and REFD (pin
26), respectively. PWRD and REFD high powers down all analog circuitry maintaining data from the previous
conversion in the internal registers, provided that the data has not already been shifted out through the serial
port. Typical power consumption in this mode is 50
μ
W. Power recovery is typically 1 ms, using a 2.2-
μ
F
capacitor connected to CAP.
Figure 47
shows power-down to power-up recovery time relative to the capacitor
value on CAP. With +5 V applied to V
DIG
, the digital circuitry of the ADS8506 remains active at all times,
regardless of PWRD and REFD states.
PWRD
PWRD high powers down all of the analog circuitry except for the reference. Data from the previous conversion
is maintained in the internal registers and can still be read. With PWRD high, a convert command yields
meaningless data.
REFD
REFD high powers down the internal 2.5-V reference. All other analog circuitry, including the reference buffer, is
active. REFD should be high when using an external reference to minimize power consumption and the loading
effects on the external reference. See
Figure 46
for the characteristic impedance of the reference buffer's input
for both REFD high and low. The internal reference consumes approximately 5 mW.
LAYOUT
POWER
For optimum performance, tie the analog and digital power pins to the same +5-V power supply and tie the
analog and digital grounds together. As noted in the electrical characteristics, the ADS8506 uses 90% of its
power for the analog circuitry. The ADS8506 should be considered as an analog component.
ADS8506
SLAS484A–SEPTEMBER 2007–REVISED OCTOBER 2007
Figure 47. Power-Down to Power-Up Time vs Capacitor Value on CAP
The output of the buffer is capable of driving up to 1 mA of current to a DC load. Using an external buffer allows
the internal reference to be used for larger DC loads and AC loads. Do not attempt to directly drive an AC load
with the output voltage on CAP. This causes performance degradation of the converter.
The +5-V power for the A/D converter should be separate from the +5 V used for the system's digital logic.
Connecting V
DIG
(pin 28) directly to a digital supply can reduce converter performance due to switching noise
Copyright 2007, Texas Instruments Incorporated
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ADS8506
相關(guān)PDF資料
PDF描述
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
ADS976 Converter IC
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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(lèi)型:Differential 信噪比:107 dB 接口類(lèi)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(lèi)型:Differential 信噪比:107 dB 接口類(lèi)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(lèi)型:Differential 信噪比:107 dB 接口類(lèi)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(lèi)型:Differential 信噪比:107 dB 接口類(lèi)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
ADS8506IDW 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(lèi)型:Differential 信噪比:107 dB 接口類(lèi)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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