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參數(shù)資料
| 型號(hào)： | ADS8320 |
| 英文描述： | 16-Bit, High-Speed, 2.7V to 5V microPower Sampling ANALOG-TO-DIGITAL CONVERTER |
| 中文描述： | 16位，高速，2.7V到5V微功耗采樣模擬到數(shù)字轉(zhuǎn)換器 |
| 文件頁(yè)數(shù)： | 13/13頁(yè) |
| 文件大?。?/td> | 105K |
| 代理商： | ADS8320 |
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ADS8320
The basic SAR architecture is sensitive to spikes on the
power supply, reference, and ground connections that occur
just prior to latching the comparator output. Thus, during
any single conversion for an n-bit SAR converter, there are
n “windows” in which large external transient voltages can
easily affect the conversion result. Such spikes might origi-
nate from switching power supplies, digital logic, and high
power devices, to name a few. This particular source of error
can be very difficult to track down if the glitch is almost
synchronous to the converter’s DCLOCK signal—as the
phase difference between the two changes with time and
temperature, causing sporadic misoperation.
With this in mind, power to the ADS8320 should be clean
and well bypassed. A 0.1
μ
F ceramic bypass capacitor should
be placed as close to the ADS8320 package as possible. In
addition, a 1 to 10
μ
F capacitor and a 5
or
10
series
resistor may be used to lowpass filter a noisy supply.
The reference should be similarly bypassed with a 0.1
μ
F
capacitor. Again, a series resistor and large capacitor can be
used to lowpass filter the reference voltage. If the reference
voltage originates from an op amp, be careful that the op
amp can drive the bypass capacitor without oscillation (the
series resistor can help in this case). Keep in mind that while
the ADS8320 draws very little current from the reference on
average, there are still instantaneous current demands placed
on the external input and reference circuitry.
Burr-Brown’s OPA627 op amp provides optimum perfor-
mance for buffering both the signal and reference inputs. For
low cost, low voltage, single-supply applications, the
OPA2350 or OPA2340 dual op amps are recommended.
Also, keep in mind that the ADS8320 offers no inherent
rejection of noise or voltage variation in regards to the
reference input. This is of particular concern when the
reference input is tied to the power supply. Any noise and
ripple from the supply will appear directly in the digital
results. While high frequency noise can be filtered out as
described in the previous paragraph, voltage variation due to
the line frequency (50Hz or 60Hz), can be difficult to
remove.
The GND pin on the ADS8320 should be placed on a clean
ground point. In many cases, this will be the “analog”
ground. Avoid connecting the GND pin too close to the
grounding point for a microprocessor, microcontroller, or
digital signal processor. If needed, run a ground trace di-
rectly from the converter to the power supply connection
point. The ideal layout will include an analog ground plane
for the converter and associated analog circuitry.
APPLICATION CIRCUITS
Figure 8 shows a basic data acquisition system. The ADS8320
input range is 0V to V
CC
, as the reference input is connected
directly to the power supply. The 5
resistor and 1
μ
F to
10
μ
F capacitor filter the microcontroller “noise” on the
supply, as well as any high-frequency noise from the supply
itself. The exact values should be picked such that the filter
provides adequate rejection of the noise.
FIGURE 8. Basic Data Acquisition System.
ADS8320
V
CC
CS
D
OUT
DCLOCK
V
REF
+In
–In
GND
+
+
5
1
μ
F to
10
μ
F
1
μ
F to
10
μ
F
0.1
μ
F
Microcontroller
+2.7V to +5.25V
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ADS8320E | 16-Bit, High-Speed, 2.7V to 5V microPower Sampling ANALOG-TO-DIGITAL CONVERTER |
| ADS8320EB | 16-Bit, High-Speed, 2.7V to 5V microPower Sampling ANALOG-TO-DIGITAL CONVERTER |
| ADS8323 | TERMINAL |
| ADS8343 | 16-Bit, 4-Channel Serial Output Sampling ANALOG-TO-DIGITAL CONVERTER |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADS8320E | 制造商:Rochester Electronics LLC 功能描述: |
| ADS8320E | 制造商:Texas Instruments 功能描述:16BIT ADC DUAL SMD 8320 SOIC8 |
| ADS8320E/250 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 16-Bit Hi-Sp 2.7-5V MicroPwr Sampling 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 |
| ADS8320E/250 | 制造商:Texas Instruments 功能描述:IC 16BIT ADC 100KSPS SMD 制造商:Texas Instruments 功能描述:IC, 16BIT ADC, 100KSPS, SMD 制造商:Texas Instruments 功能描述:IC, 16BIT ADC, 100KSPS, SMD; Resolution (Bits):16bit; Sampling Rate:100kSPS; Supply Voltage Type:Single; Supply Voltage Min:2.7V; Supply Voltage Max:5.25V; Supply Current:900A; Digital IC Case Style:MSOP; No. of Pins:8; Input ;RoHS Compliant: Yes |
| ADS8320E/250G4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 16-Bit Hi-Sp 2.7-5V MicroPwr Sampling 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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