- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄375266 > ADS8320 16-Bit, High-Speed, 2.7V to 5V microPower Sampling ANALOG-TO-DIGITAL CONVERTER PDF資料下載
參數(shù)資料
| 型號： | 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 |
| 文件頁數(shù)： | 12/13頁 |
| 文件大?。?/td> | 105K |
| 代理商： | ADS8320 |
12
ADS8320
Figure 5 shows the current consumption of the ADS8320
versus sample rate. For this graph, the converter is clocked
at 2.4MHz regardless of the sample rate—CS is HIGH for
the remaining sample period. Figure 6 also shows current
consumption versus sample rate. However, in this case, the
DCLOCK period is 1/24th of the sample period—CS is
HIGH for one DCLOCK cycle out of every 16.
There is an important distinction between the power-down
mode that is entered after a conversion is complete and the
full power-down mode which is enabled when CS is HIGH.
CS LOW will shut down only the analog section. The digital
section is completely shutdown only when CS is HIGH.
Thus, if CS is left LOW at the end of a conversion and the
converter is continually clocked, the power consumption
will not be as low as when CS is HIGH. See Figure 7 for
more information.
Power dissipation can also be reduced by lowering the
power supply voltage and the reference voltage. The
ADS8320 will operate over a V
CC
range of 2.0V to 5.25V.
However, at voltages below 2.7V, the converter will not run
at a 100kHz sample rate. See the typical performance curves
for more information regarding power supply voltage and
maximum sample rate.
SHORT CYCLING
Another way of saving power is to utilize the CS signal to
short cycle the conversion. Because the ADS8320 places the
latest data bit on the D
OUT
line as it is generated, the
converter can easily be short cycled. This term means that
the conversion can be terminated at any time. For example,
if only 14 bits of the conversion result are needed, then the
conversion can be terminated (by pulling CS HIGH) after
the 14th bit has been clocked out.
This technique can be used to lower the power dissipation
(or to increase the conversion rate) in those applications
where an analog signal is being monitored until some con-
dition becomes true. For example, if the signal is outside a
predetermined range, the full 16-bit conversion result may
not be needed. If so, the conversion can be terminated after
the first n bits, where n might be as low as 3 or 4. This results
in lower power dissipation in both the converter and the rest
of the system, as they spend more time in the power-down
mode.
LAYOUT
For optimum performance, care should be taken with the
physical layout of the ADS8320 circuitry. This will be
particularly true if the reference voltage is low and/or the
conversion rate is high. At a 100kHz conversion rate, the
ADS8320 makes a bit decision every 416ns. That is, for each
subsequent bit decision, the digital output must be updated
with the results of the last bit decision, the capacitor array
appropriately switched and charged, and the input to the
comparator settled to a 16-bit level all within one clock
cycle.
FIGURE 5. Maintaining f
CLK
at the Highest Possible Rate
Allows Supply Current to Drop Linearly with
Sample Rate.
FIGURE 6. Scaling f
CLK
Reduces Supply Current Only
Slightly with Sample Rate.
FIGURE 7. Shutdown Current with CS HIGH is 50nA
Typically, Regardless of the Clock. Shutdown
Current with CS LOW Varies with Sample
Rate.
1000
800
600
400
200
0.0
0.00
S
μ
A
0.1
1
10
100
Sample Rate (kHz)
T
A
= 25
°
C
V
CC
= 5.0V
V
REF
= 5.0V
f
CLK
= 24 f
SAMPLE
CS LOW (GND)
CS HIGH (V
CC
)
0.250
1000
100
10
1
S
μ
A
0.1
1
10
100
Sample Rate (kHz)
T
A
= 25
°
C
V
CC
= 5.0V
V
REF
= 5.0V
f
CLK
= 24 f
SAMPLE
1000
100
10
1
S
μ
A
0.1
1
10
100
Sample Rate (kHz)
V
CC
= 5.0V
V
REF
= 5.0V
V
CC
= 2.7V
V
REF
= 2.5V
T
A
= 25
°
C
f
CLK
= 2.4MHz
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 |
| ADS8343E | 16-Bit, 4-Channel Serial Output Sampling ANALOG-TO-DIGITAL CONVERTER |
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 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。