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| 型號： | AD7870 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Complete, 12-Bit, 100 kHz, Sampling ADCs(LC2MOS 12位100kHz采樣A/D轉(zhuǎn)換器) |
| 中文描述： | 完整的，12位，100千赫采樣ADC（LC2MOS 12位100kHz的采樣的A / D轉(zhuǎn)換器） |
| 文件頁數(shù)： | 13/20頁 |
| 文件大小： | 346K |
| 代理商： | AD7870 |
REV. B
2
AD7870/AD7875/AD7876
–13–
MICROPROCE SSOR INT E RFACE
T he AD7870/AD7875/AD7876 has a wide variety of interfacing
options. It offers two operating modes and three data-output for-
mats. Fast data access times allow direct interfacing to most mi-
croprocessors including the DSP processors.
Parallel Read Interfacing
Figures 17 to 19 show interfaces to the ADSP-2100, T MS32010
and the T MS32020 DSP processors. T he ADC is operating in
Mode 1, parallel read for all three interfaces. An external timer
controls conversion start asynchronously to the microprocessor.
At the end of each conversion the ADC
BUSY
/
INT
interrupts
the microprocessor. T he conversion result is read from the ADC
with the following instruction:
ADSP-2100: MR0 = DM(ADC)
T MS32010: IN D,ADC
T MS32020: IN D,ADC
MR0 = ADSP-2100 MR0 Register
D = Data Memory Address
ADC = AD7870/AD7875/AD7876 Address
Some applications may require that conversions be initiated by
the microprocessor rather than an external timer. One option is
to decode the
CONVST
signal from the address bus so that a
write operation to the ADC starts a conversion. Data is read at
the end of conversion as described earlier. Note: a read operation
must not be attempted during conversion.
Figure 17. ADSP-2100 Parallel Interface
Figure 18. TMS32010 Parallel Interface
Figure 19. TMS32020 Parallel Interface
T wo Byte Read Interfacing
68008 Interface
Figure 20 shows an 8-bit bus interface for the MC68008 micro-
processor. For this interface, the 12/
8
/CLK input is tied to 0 V
and the DB11/HBEN pin is driven from the microprocessor
least significant address bit. Conversion start control is provided
by the microprocessor. In this interface example, a Move in-
struction from the ADC address both starts a conversion and
reads the conversion result.
MOVEW ADC,DO
ADC = AD7870/AD7875/AD7876 address
D0 = 68008 D0 register
T his is a two byte read instruction. During the first read opera-
tion
BUSY
, in conjunction with
CS
, forces the microprocessor
to WAIT for the ADC conversion. At the end of conversion the
ADC low byte (DB7–DB0) is loaded into D15–D8 of the D0
register and the ADC high byte (DB15–DB7) is loaded into
D7–D0 of the D0 register. T he following Rotate instruction to
the D0 register swaps the high and low bytes to the correct
format.
R0L = 8, D0.
Note: while executing the two byte read instruction above,
WAIT states are inserted during the first read operation only
and not for the second.
Figure 20. MC68008 Byte Interface
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD7870A | 制造商:AD 制造商全稱:Analog Devices 功能描述:LC2MOS Complete, 12-Bit, 100 kHz , Sampling ADC |
| AD7870AJN | 制造商:Analog Devices 功能描述:ADC Single SAR 100ksps 12-bit Parallel/Serial 24-Pin PDIP 制造商:Rochester Electronics LLC 功能描述:12-BIT SAMPLING ADC IC - Bulk |
| AD7870AJNZ | 功能描述:IC ADC 12BIT SAMPLING 3V 24-DIP RoHS:是 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(gè)單端，雙極 |
| AD7870AQ | 功能描述:IC ADC 12BIT SAMPLING 3V 24-CDIP RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 位數(shù):12 采樣率（每秒）:3M 數(shù)據(jù)接口:- 轉(zhuǎn)換器數(shù)目:- 功率耗散（最大）:- 電壓電源:- 工作溫度:- 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 供應(yīng)商設(shè)備封裝:SOT-23-6 包裝:帶卷 (TR) 輸入數(shù)目和類型:- |
| AD7870BQ | 功能描述:IC ADC 12BIT SAMPLING 3V 24-CDIP 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(gè)單端，雙極 |
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