參數(shù)資料
型號(hào): ADS8328IBPW
英文描述: LOW POWER, 16-BIT, 500-kHz, SINGLE/DUAL UNIPOLAR INPUT, ANALOG-TO-DIGITAL CONVERTERS WITH SERIAL INTERFACE
中文描述: 低功耗,16位,500千赫,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): 24/40頁
文件大小: 2759K
代理商: ADS8328IBPW
www.ti.com
Status Output EOC/INT
Power-Down Modes
0.1
1
10
100
20
10020
20020
30020
40020
Settling Time ns
+
ADS8327
ADS8328
SLAS415A–APRIL 2006–REVISED MAY 2006
THEORY OF OPERATION (continued)
Table 1. Different Types of Conversion
MODE
SELECT CHANNEL
Auto Channel Select
(1)
START CONVERSION
Auto Trigger
Start a conversion based on the
conversion clock CCLK.
Manual Trigger
Start a conversion with CONVST.
Automatic
No need to write channel number to the CMR. Use internal sequencer for the
ADS8328.
Manual Channel Select
Manual
Write the channel number to the CMR.
(1)
Auto channel select should be used with auto trigger and also with the TAG bit enabled.
When the status pin is programmed as EOC and the polarity is set as active low, the pin works in the following
manner: The EOC output goes LOW immediately following CONVST going LOW when manual trigger is
programmed. EOC stays LOW throughout the conversion process and returns to HIGH when the conversion has
ended. The EOC output goes low for 3 conversion clocks (CCLK) after the previous rising edge of EOC, if auto
trigger is programmed.
This status pin is programmable. It can be used as an EOC output (CFR.D[7:6] = 1, 1) where the low time is
equal to the conversion time. This status pin can be used as INT. (CFR.D[7:6] = 1, 0) which is set LOW at the
end of a conversion is brought to HIGH (cleared) by the next read cycle. The polarity of this pin, used as either
function (EOC or INT), is programmable through CFR_D7.
The ADS8327/28 has a comprehensive built-in power-down feature. There are three power-down modes: Deep
power-down mode, Nap power-down mode, and auto nap power-down mode. All three power-down modes are
enabled by setting the related CFR bits. The first two power-down modes are activated when enabled. A wakeup
command, 1011b, can resume device operation from a power-down mode. Auto nap power-down mode works
slightly different. When the converter is enabled in auto nap power-down mode, an end of conversion instance
(EOC) puts the device into auto nap powerdown. The beginning of sampling resumes operation of the converter.
The contents of the configuration register is not affected by any of the power-down modes. Any ongoing
conversion when nap or deep powerdown is activated is aborted.
Figure 55. Typical Analog Supply Current Drop vs Time After Powerdown
24
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