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參數(shù)資料
| 型號： | AD7886JP |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 2/16頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 12BIT SAMPLING HS 28-PLCC |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 位數(shù)： | 12 |
| 采樣率（每秒）： | 1M |
| 數(shù)據(jù)接口： | 并聯(lián) |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 功率耗散（最大）： | 350mW |
| 電壓電源： | 雙 ± |
| 工作溫度： | 0°C ~ 70°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 28-LCC（J 形引線） |
| 供應(yīng)商設(shè)備封裝： | 28-PLCC（11.51x11.51） |
| 包裝： | 管件 |
| 輸入數(shù)目和類型： | 2 個單端，單極；2 個單端，雙極 |
AD7886
–10–
REV. B
determined by the largest harmonic in the spectrum, but for
parts where the harmonics are buried in the noise floor, the peak
will be a noise peak.
Figure 14. AD7886 IMD Plot
MICROPROCESSOR INTERFACING
The AD7886 is designed to interface to microprocessors as a
memory mapped device. Its
CS and RD control inputs are com-
mon to all memory peripheral interfacing. Figures 15 to 21
demonstrate typical interfaces for the AD7886.
AD7886–TMS320C10/TMS32020
Figures 15 and 16 show typical interfaces for the TMS320C10
and the TMS32020 DSP processors. An external timer controls
conversion start to the processor. At the end of each conversion,
the ADC’s
BUSY output interrupts the microprocessor. The
conversion result can then be read from the ADC with the fol-
lowing instruction:
IN D,ADC (ADC = ADC address)
AD788S ADSP-2100/TMS320C25/DSP56000
Some of the faster DSP processors have data access times out-
side the capabilities of the AD7886. Interfacing to such proces-
sors requires the use of either a single WAIT state or external
latches. Examples are shown in Figures 17, 18 and 19.
The use of a single WAIT state for the TMS320C25 and the
ADSP-2100 interfaces extends the read instruction to the ADC
by one processor CLK OUT cycle. In the DSP56000 example,
the ADC’s data is first clocked into 74HC374 latches before be-
ing read by the processor. The AD7886’s
CS and RD inputs are
tied permanently low, and the rising edge of
BUSY updates the
latches at the end of conversion. Both methods of overcoming
the very fast data access time required by these processors are
interchangeable, i.e., a WAIT state can be used for the DSP56000,
eliminating the need for latches or vice or versa, for the other
two interfaces.
For all three interfaces, an external timer controls conversion
start; the processor is interrupted at the end of each conversion
by the ADC’s
BUSY output. The following instruction then
reads data from the ADC:
ADSP-2100 – MR = DM(ADC)
TMS320C25 – IN D,ADC
DSP56000 – MOVEP Y:ADC,XO
Assuming the ADC is memory mapped into the top
64 locations in Y memory space. (ADC = ADC address)
PA0
PA2
D15
D0
MEN
ADDRESS BUS
TIMER
DATA BUS
CONVST
CS
DB11
DB0
RD
BUSY
AD7886*
TMS320C10
*ADDITIONAL PINS OMITTED FOR CLARITY
INT
DEN
EN
ADDR
ENCODE
Figure 15. AD7886-TMS320C10 Interface
A0
A15
D15
D0
IS
EN
ADDR
ENCODE
ADDRESS BUS
TIMER
DATA BUS
CONVST
CS
DB11
DB0
RD
BUSY
AD7886*
TMS32020
*ADDITIONAL PINS OMITTED FOR CLARITY
INTn
R/W
STRB
Figure 16. AD7886-TMS32020 Interface
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD7886JP-REEL | 功能描述:IC ADC 12BIT SAMPLING HS 28-PLCC RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 位數(shù):14 采樣率（每秒）:83k 數(shù)據(jù)接口:串行，并聯(lián) 轉(zhuǎn)換器數(shù)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(yīng)商設(shè)備封裝:28-PDIP 包裝:管件 輸入數(shù)目和類型:1 個單端，雙極 |
| AD7886KP-REEL | 制造商:Analog Devices 功能描述: |
| AD7887AR | 功能描述:IC ADC 12BIT 2CH SRL 8-SOIC RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 標(biāo)準(zhǔn)包裝:1,000 系列:- 位數(shù):16 采樣率（每秒）:45k 數(shù)據(jù)接口:串行 轉(zhuǎn)換器數(shù)目:2 功率耗散（最大）:315mW 電壓電源:模擬和數(shù)字 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:28-SOIC W 包裝:帶卷 (TR) 輸入數(shù)目和類型:2 個單端，單極 |
| AD7887ARM | 功能描述:IC ADC 12BIT 2CH SRL 8-MSOP RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 標(biāo)準(zhǔn)包裝:1,000 系列:- 位數(shù):16 采樣率（每秒）:45k 數(shù)據(jù)接口:串行 轉(zhuǎn)換器數(shù)目:2 功率耗散（最大）:315mW 電壓電源:模擬和數(shù)字 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:28-SOIC W 包裝:帶卷 (TR) 輸入數(shù)目和類型:2 個單端，單極 |
| AD7887ARM-REEL | 制造商:Analog Devices 功能描述:ADC Single SAR 125ksps 12-bit Serial 8-Pin MSOP T/R |
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