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參數資料
| 型號： | AD7922AUJ-R2 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | ADC |
| 英文描述： | ER 2C 2#16S PIN RECP |
| 中文描述： | 2-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO8 |
| 封裝： | MO-193BA, TSOT-8 |
| 文件頁數： | 25/32頁 |
| 文件大小： | 386K |
| 代理商： | AD7922AUJ-R2 |
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AD7912/AD7922
SERIAL INTERFACE
Figure 37 and Figure 38 show the detailed timing diagrams for
serial interfacing to the AD7922 and AD7912, respectively. The
serial clock provides the conversion clock and also controls the
transfer of information from the AD7912/AD7922 during
conversion.
Rev. 0 | Page 25 of 32
The CS signal initiates the data transfer and conversion process.
The falling edge of CS puts the track-and-hold into hold mode,
takes the bus out of three-state. The analog input is sampled at
this point and the conversion is initiated.
For the AD7922, the conversion requires 16 SCLK cycles to
complete. Once 13 SCLK falling edges have elapsed, the track-
and-hold goes back into track on the next SCLK rising edge, as
shown in Figure 37 at Point B. On the 16th SCLK falling edge,
the DOUT line goes back into three-state. If the rising edge of
CS occurs before 16 SCLKs have elapsed, then the conversion is
terminated and the DOUT line goes back into three-state.
Otherwise, DOUT returns to three-state on the 16th SCLK
falling edge, as shown in Figure 37. Sixteen serial clock cycles
are required to perform the conversion process and to access
data from the AD7922.
For the AD7912, the conversion requires 14 SCLK cycles to
complete. Once 13 SCLK falling edges have elapsed, the track-
and-hold goes back into track on the next SCLK rising edge, as
shown in Figure 38 at Point B.
If the rising edge of CS occurs before 14 SCLKs have elapsed,
then the conversion is terminated and the DOUT line goes back
into three-state. If 16 SCLKs are considered in the cycle, DOUT
returns to three-state on the 16th SCLK falling edge, as shown
in Figure 38.
CS going low clocks out the first leading zero to be read in by
the microcontroller or DSP. The remaining data is then clocked
out by subsequent SCLK falling edges beginning with the
second leading zero. Therefore, the first falling clock edge on
the serial clock has the first leading zero provided and also
clocks out the second leading zero. The final bit in the data
transfer is valid on the 16th falling edge, having been clocked
out on the previous (15th) falling edge.
In applications with a slower SCLK, it is possible to read in data
on each SCLK rising edge. In that case, the first falling edge of
SCLK clocks out the second leading zero and it can be read in
the first rising edge. However, the first leading zero that is
clocked out when CS goes low is missed, unless it is read on the
first falling SCLK edge. The 15th falling edge of SCLK clocks
out the last bit and it can be read in the 15th rising SCLK edge.
If CS goes low just after the SCLK falling edge has elapsed, CS
clocks out the first leading zero as before and it can be read in
the SCLK rising edge. The next SCLK falling edge clocks out
the second leading zero and it can be read in the following
rising edge.
0
ZERO
X
1
2
3
4
5
13
14
t
5
15
16
X
CHN
STY
X
X
X
X
X
CHN
MOD
DB11
DB10
DB2
DB1
DB0
Z
t
2
t
6
t
4
t
8
t
9
t
3
t
7
t
10
t
1
t
QUIET
t
CONVERT
SCLK
CS
DOUT
THREE-STATE
THREE-STATE
DIN
B
Figure 37. AD7922 Serial Interface Timing Diagram
0
ZERO
X
1
2
3
4
5
13
14
t
5
15
16
X
CHN
STY
X
X
X
X
X
CHN
MOD
DB9
DB8
DB0
ZERO
ZERO
Z
t
2
t
6
t
4
t
8
t
9
t
3
t
7
t
10
t
1
t
QUIET
t
CONVERT
SCLK
CS
DOUT
THREE-STATE
THREE-STATE
TWO TRAILING ZEROS
DIN
B
Figure 38. AD7912 Serial Interface Timing Diagram
相關PDF資料 |
PDF描述 |
|---|---|
| AD7912AUJ-R2 | 2-Channel, 2.35 V to 5.25 V, 1 MSPS, 10-/12-Bit ADCs |
| AD7922AUJ-REEL7 | Circular Connector; No. of Contacts:7; Series:; Body Material:Aluminum Alloy; Connecting Termination:Solder; Connector Shell Size:16S; Circular Contact Gender:Socket; Circular Shell Style:Wall Mount Receptacle |
| AD7912AUJ-REEL7 | Circular Connector; No. of Contacts:5; Series:; Body Material:Aluminum Alloy; Connecting Termination:Solder; Connector Shell Size:16S; Circular Contact Gender:Pin; Circular Shell Style:Wall Mount Receptacle; Insert Arrangement:16S-8 RoHS Compliant: No |
| AD7912 | 2-Channel, 2.35 V to 5.25 V, 1 MSPS, 10-/12-Bit ADCs |
| AD7912ARM | 2-Channel, 2.35 V to 5.25 V, 1 MSPS, 10-/12-Bit ADCs |
相關代理商/技術參數 |
參數描述 |
|---|---|
| AD7922AUJ-REEL | 制造商:Analog Devices 功能描述:ADC Single SAR 1Msps 12-bit Serial 8-Pin TSOT T/R |
| AD7922AUJ-REEL7 | 制造商:Analog Devices 功能描述:ADC Single SAR 1Msps 12-bit Serial 8-Pin TSOT T/R 制造商:Rochester Electronics LLC 功能描述:DUAL 12-BIT, 1MSPS, ADC I.C - Tape and Reel |
| AD7922AUJZ-REEL7 | 功能描述:IC ADC DUAL 12BIT 2CH TSOT-23-8 RoHS:是 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 其它有關文件:TSA1204 View All Specifications 標準包裝:1 系列:- 位數:12 采樣率（每秒）:20M 數據接口:并聯 轉換器數目:2 功率耗散（最大）:155mW 電壓電源:模擬和數字 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-TQFP 供應商設備封裝:48-TQFP（7x7） 包裝:Digi-Reel® 輸入數目和類型:4 個單端，單極；2 個差分，單極 產品目錄頁面:1156 (CN2011-ZH PDF) 其它名稱:497-5435-6 |
| AD7923 | 制造商:AD 制造商全稱:Analog Devices 功能描述:4-Channel, 200 kSPS, 12-Bit ADC with Sequencer in 16-Lead TSSOP |
| AD7923_11 | 制造商:AD 制造商全稱:Analog Devices 功能描述:4-Channel, 200 kSPS 12-Bit ADC with Sequencer in 16-Lead TSSOP |
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