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參數資料
| 型號： | AD7893BR5REEL |
| 英文描述： | Converter IC |
| 中文描述： | 轉換器IC |
| 文件頁數： | 11/20頁 |
| 文件大?。?/td> | 191K |
| 代理商： | AD7893BR5REEL |
REV. B
AD7890
–11–
When using the device in the External-Clocking Mode, the out-
put register can be read at any time and the most up-to-date
conversion result will be obtained. However, reading data from
the output register or writing data to the Control Register dur-
ing conversion or during the 500 ns prior to the next
CONVST
will result in reduced performance from the part. A read opera-
tion to the output register has most effect on performance with
the signal-to-noise ratio likely to degrade especially when higher
serial clock rates are used while the code flicker from the part
will also increase (see AD7890 Performance section).
Figure 5 shows the timing and control sequence required to
obtain optimum performance from the part in the external
clocking mode. In the sequence shown, conversion is initiated
on the rising edge of
CONVST
and new data is available in the
output register of the AD7890 5.9
μ
s later. Once the read oper-
ation has taken place, a further 500 ns should be allowed before
TRACK/HOLD GOES
INTO THE HOLD
t
CONVERT
THREE-STATE
NOTE:
(I) SIGNIFIES AN INPUT; (O) SIGNIFIES AN OUTPUT. PULL-UP RESISTOR ON SCLK.
DATA OUT (O)
SCLK (O)
RFS
(O)
CONVST
(I)
Figure 4. Self-Clocking (Master) Mode Conversion Sequence
RFS
TFS
t
CONVERT
500ns MIN
CONVST
SCLK
CONVERSION IS
INITIATED AND
TRACK/HOLD GOES
INTO HOLD
CONVERSION
ENDS 5.9 s
LATER
SERIAL READ
AND WRITE
OPERATIONS
READ AND WRITE
OPERATIONS SHOULD END
500ns PRIOR TO NEXT
RISING EDGE OF
CONVST
NEXT CONVERSION
START COMMAND
Figure 5. External Clocking (Slave) Mode Timing Sequence for Optimum Performance
the next rising edge of
CONVST
to optimize the settling of the
track/hold before the next conversion is initiated. The diagram
shows the read operation and the write operation taking place in
parallel. On the sixth falling edge of SCLK in the write sequence
the internal pulse will be initiated. Assuming MUX OUT is
connected to SHA IN, 2
μ
s are required between this sixth
falling edge of SCLK and the rising edge of
CONVST
to allow
for the full acquisition time of the track/hold amplifier. With the
serial clock rate at its maximum of 10 MHz, the achievable
throughput rate for the part is 5.9
μ
s (conversion time) plus
0.6
μ
s (six serial clock pulses before internal pulse is initiated)
plus 2
μ
s (acquisition time). This results in a minimum through-
put time of 8.5
μ
s (equivalent to a throughput rate of 117 kHz).
If the part is operated with a slower serial clock, it will impact
the achievable throughput rate for optimum performance.
相關PDF資料 |
PDF描述 |
|---|---|
| AD7894BR-2 | Analog-to-Digital Converter， 14-Bit |
| AD7899AR-1 | Analog-to-Digital Converter， 14-Bit |
| AD7899AR-2 | 12-Bit Rail-to-Rail Micropower DACs in SO-8; Package: PDIP; No of Pins: 8; Temperature Range: -40°C to +85°C |
| AD7899AR-3 | Dual 12-Bit Rail-to-Rail Micropower DACs; Package: SO; No of Pins: 16; Temperature Range: 0°C to +70°C |
| AD7899ARS-1 | Dual 12-Bit Rail-to-Rail Micropower DACs; Package: SO; No of Pins: 16; Temperature Range: -40°C to +85°C |
相關代理商/技術參數 |
參數描述 |
|---|---|
| AD7893BR-5REEL | 制造商:Analog Devices 功能描述:ADC SGL SAR 117KSPS 12-BIT SERL 8SOIC N - Tape and Reel |
| AD7893BR-5REEL7 | 制造商:Analog Devices 功能描述: 制造商:Rochester Electronics LLC 功能描述:12-BIT ADC,8-PIN I.C. - Tape and Reel |
| AD7893BRZ-10 | 功能描述:IC ADC 12BIT SRL T/H LP 8SOIC 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 |
| AD7893BRZ-10REEL7 | 功能描述:IC ADC 12BIT SRL 8SOIC RoHS:是 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 標準包裝:1,000 系列:- 位數:12 采樣率（每秒）:300k 數據接口:并聯 轉換器數目:1 功率耗散（最大）:75mW 電壓電源:單電源 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:24-SOIC（0.295"，7.50mm 寬） 供應商設備封裝:24-SOIC 包裝:帶卷 (TR) 輸入數目和類型:1 個單端，單極；1 個單端，雙極 |
| AD7893BRZ-2 | 功能描述:IC ADC 12BIT SRL T/H LP 8SOIC RoHS:是 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 標準包裝:1 系列:- 位數:14 采樣率（每秒）:83k 數據接口:串行，并聯 轉換器數目:1 功率耗散（最大）:95mW 電壓電源:雙 ± 工作溫度:0°C ~ 70°C 安裝類型:通孔 封裝/外殼:28-DIP（0.600"，15.24mm） 供應商設備封裝:28-PDIP 包裝:管件 輸入數目和類型:1 個單端，雙極 |
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