參數資料
型號: ADS-117MM
廠商: Electronic Theatre Controls, Inc.
元件分類: 圓形連接器
英文描述: Circular Connector; No. of Contacts:13; Series:LJT07R; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:11; Circular Contact Gender:Pin; Circular Shell Style:Jam Nut Receptacle; Insert Arrangement:11-35
中文描述: 12位,2MHz的,低功耗采樣A / D轉換器
文件頁數: 3/6頁
文件大?。?/td> 165K
代理商: ADS-117MM
ADS-117
3
output coding, tie pin 18 to ground. The pin 18 signal is
compatible with CMOS/TTL logic levels for those users
desiring dynamic control of this function. Do not change
COMP BIN status while EOC is high.
5. To enable the three-state outputs, connect ENABLE (pin
17) to a logic "0" (low). To disable, connect pin 17 to a logic
"1" (high).
6. To meet the guaranteed conversion rate, a maximum start
convert pulse is specified. A wider start convert pulse will
result in slower conversion rates. An initial start convert
pulse is required before performing an actual conversion
after power-up to assure the sample-hold is in the acquisi-
tion mode.
Figure 2 shows the relationship between the various input
signals. The timing shown applies over the operating
temperature range and over the operating power supply
range.
7. Re-initiating the START CONVERT (pin 16) while EOC is a
logic "1" (high) will result in a new conversion sequence.
TECHNICAL NOTES
1. Applications which are unaffected by endpoint errors or
remove them through software will use the typical connec-
tions shown in Figure 3. Remove system errors or adjust
the small initial errors of the ADS-117 to zero using the
optional external circuitry shown in Figure 4. The external
adjustment circuit has no effect on the throughput rate.
2. Always connect the analog and digital grounds to a ground
plane beneath the converter for best performance. The
analog and digital grounds are not connected to each other
internally.
3. Bypass the analog and digital supplies and the +10V
reference (pin 21) to ground with 4.7μF, 25V tantalum
electrolytic capacitors in parallel with 0.1μF ceramic
capacitors. Bypass the +10V reference (pin 21) to
ANALOG GROUND (pin 23).
4. Obtain straight binary/offset binary output coding by tying
COMP BIN (pin 18) to +5V or leaving it open. The device
has an internal pull-up resistor on this pin. To obtain
complementary binary or complementary offset binary
Figure 2. ADS-117 Timing Diagram
START
CONVERT
INTERNAL S/H
N
N+1
Acquisition Time
165ns typ.
170ns max.
10ns min.
25ns max.
EOC
10ns min.
17ns max.
Conversion Time
325ns typ.
60ns max.
Note: Scale is approximately 25ns per division.
35ns max.
OUTPUT
DATA
DATA N-1 VALID
INVALID
DATA
DATA N VALID
350ns min.
INVALID
DATA
150ns max.
50ns typ.,
30ns min., 60ns max.
Hold
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相關代理商/技術參數
參數描述
ADS118 制造商:未知廠家 制造商全稱:未知廠家 功能描述:
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