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參數(shù)資料
| 型號(hào)： | AD7873ACPZ3 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 10-Bit, 60 MSPS ADC SE/Diff, Int/Ext Ref., program. i/p range w/Pwrdown, comp. to ADS822/4/5/6/8 28-SSOP |
| 中文描述： | 觸摸屏數(shù)字轉(zhuǎn)換器 |
| 文件頁數(shù)： | 21/28頁 |
| 文件大?。?/td> | 657K |
| 代理商： | AD7873ACPZ3 |
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AD7873
SERIAL INTERFACE
Figure 36 shows the typical operation of the serial interface of
the AD7873. The serial clock provides the conversion clock and
also controls the transfer of information to and from the
AD7873. One complete conversion can be achieved with 24
DCLK cycles.
Rev. D | Page 21 of 28
The CS signal initiates the data transfer and conversion process.
The falling edge of CS takes the BUSY output and the serial bus
out of three-state. The first eight DCLK cycles are used to write
to the control register via the DIN pin. The control register is
updated in stages as each bit is clocked in. Once the converter
has enough information about the following conversion to set
the input multiplexer and switches appropriately, the converter
enters the acquisition mode and, if required, the internal switches
are turned on. During acquisition mode, the reference input
data is updated. After the three DCLK cycles of acquisition, the
control word is complete (the power management bits are now
updated) and the converter enters conversion mode. At this
point, track-and-hold goes into hold mode, the input signal is
sampled, and the BUSY output goes high (BUSY returns low on
the next falling edge of DCLK). The internal switches can also
turn off at this point if in single-ended mode, battery-monitor
mode, or temperature measurement mode.
The next 12 DCLK cycles are used to perform the conversion
and to clock out the conversion result. If the conversion is
ratiometric (SER/DFR low), the internal switches are on during
the conversion. A 13th DCLK cycle is needed to allow the
DSP/micro to clock in the LSB. Three more DCLK cycles clock
out the three trailing zeroes and complete the 24 DCLK transfer.
The 24 DCLK cycles can be provided from a DSP or via three
bursts of eight clock cycles from a microcontroller.
0
CS
DCLK
DIN
BUSY
DOUT
X/Y SWITCHES
1
(SER/DFR HIGH)
X/Y SWITCHES
1,2
(SER/DFR LOW)
THREE-STATE
(START)
IDLE
OFF
OFF
(MSB)
(LSB)
ON
ON
OFF
OFF
ACQUIRE
CONVERSION
IDLE
ZERO FILLED
THREE-STATE
THREE-STATE
THREE-STATE
t
ACQ
1
8
8
8
11
10
9
8
7
6
5
4
3
2
1
0
1
1
S
A2
PD1 PD0
A1
A0
MODEDFR
NOTES
1
Y DRIVERS ARE ON WHEN X+ IS SELECTED INPUT CHANNEL (A2–A0 = 001), X DRIVERS ARE ON WHEN Y+ IS SELECTED INPUT CHANNEL (A2–A0 = 101).
1
WHEN PD1, PD0 = 00, 01 OR 10, Y– WILL TURN ON AT END OF CONVERSION.
2
DRIVERS WILL REMAIN ON IF POWER-DOWN MODE IS 11 (NO POWER-DOWN) UNTIL SELECTED INPUT CHANNEL, REFERENCE MODE,
1
OR POWER-DOWN MODE IS CHANGED, OR CS IS HIGH.
Figure 36. Conversion Timing, 24 DCLKS per Conversion Cycle, 8-Bit Bus Interface. No DCLK delay required with dedicated serial port.
0
CS
DCLK
DIN
BUSY
DOUT
DB11
PD0
DB10
t
1
t
4
t
5
t
6
t
6
t
9
t
10
t
11
t
7
t
2
t
3
t
8
t
12
Figure 37. Detail Timing Diagram
相關(guān)PDF資料 |
PDF描述 |
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| AD7873ARQ | 10-Bit, 60 MSPS ADC SE/Diff, Int/Ext Ref., program. i/p range w/Pwrdown, comp. to ADS822/4/5/6/8 28-SSOP |
| AD7873ARU | Touch Screen Digitizer |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD7873ACPZ-REEL | 功能描述:IC ADC 12BIT TOUCHSCREEN 16LFCSP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 觸摸屏控制器 系列:- 標(biāo)準(zhǔn)包裝:96 系列:- 類型:- 觸摸面板接口:- 輸入數(shù)/鍵:- 分辨率（位）:- 評(píng)估套件:* 數(shù)據(jù)接口:- 數(shù)據(jù)速率/采樣率 (SPS，BPS):- 電壓基準(zhǔn):- 電源電壓:- 電流 - 電源:- 工作溫度:- 安裝類型:表面貼裝 封裝/外殼:16-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:16-TSSOP 包裝:帶卷 (TR) |
| AD7873ACPZ-REEL7 | 功能描述:IC ADC 12BIT TOUCHSCREEN 16LFCSP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 觸摸屏控制器 系列:- 標(biāo)準(zhǔn)包裝:96 系列:- 類型:- 觸摸面板接口:- 輸入數(shù)/鍵:- 分辨率（位）:- 評(píng)估套件:* 數(shù)據(jù)接口:- 數(shù)據(jù)速率/采樣率 (SPS，BPS):- 電壓基準(zhǔn):- 電源電壓:- 電流 - 電源:- 工作溫度:- 安裝類型:表面貼裝 封裝/外殼:16-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:16-TSSOP 包裝:帶卷 (TR) |
| AD7873ARQ | 制造商:Analog Devices 功能描述:TOUCH SCREEN DIGITIZER 制造商:Rochester Electronics LLC 功能描述:2.7V 12-BIT TOUCH SCREEN DIGITIZER I.C. - Bulk 制造商:Analog Devices 功能描述:IC 12-BIT ADC |
| AD7873ARQ-REEL | 制造商:Analog Devices 功能描述:TOUCH SCREEN DIGITIZER 制造商:Rochester Electronics LLC 功能描述:2.7V 12-BIT TOUCH SCREEN DIGITIZER I.C. - Tape and Reel |
| AD7873ARQ-REEL7 | 制造商:Analog Devices 功能描述:TOUCH SCREEN DIGITIZER 制造商:Analog Devices 功能描述:2.7V 12-BIT TOUCH SCREEN DIGITIZER I.C. - Tape and Reel 制造商:Rochester Electronics LLC 功能描述:2.7V 12-BIT TOUCH SCREEN DIGITIZER I.C. - Tape and Reel |
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