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| 型号： | AD7865BSZ-3 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 9/19页 |
| 文件大小： | 0K |
| 描述： | IC ADC 14BIT 4CHAN 5V 44-MQFP |
| 标准包装： | 1 |
| 位数： | 14 |
| 采样率（每秒）： | 350k |
| 数据接口： | 并联 |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 160mW |
| 电压电源： | 模拟和数字 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 44-QFP |
| 供应商设备封装： | 44-MQFP（10x10） |
| 包装： | 托盘 |
| 输入数目和类型： | 4 个差分，双极 |
REV. B
AD7865
–17–
AC Linearity Plots
The plots shown in Figure 18 below show typical DNL and INL
for the AD7865.
ADC – Code
0
DNL
–
LSBs
–0.60
0
4000
8000
12000
16383
0.60
ADC – Code
0
iNL
–
LSBs
–0.60
0
4000
8000
12000
16383
0.60
Figure 18. Typical DNL and INL Plots
MICROPROCESSOR INTERFACING
The high speed parallel interface of the AD7865 allows easy
interfacing to most DSPs and microprocessors. The AD7865
interface of the AD7865 consists of the data lines (DB0 to
DB13),
CS, RD, WR, EOC and BUSY.
AD7865–ADSP-21xx Interface
Figure 19 shows an interface between the AD7865 and the
ADSP-210x. The
CONVST signal can be generated by the
ADSP-210x or from some other external source. Figure 19
shows the
CS being generated by a combination of the DMS
signal and the address bus of the ADSP-2100. In this way the
AD7865 is mapped into the data memory space of the
ADSP-210x.
The AD7865 BUSY line provides an interrupt to the ADSP-
210x when the conversion sequence is complete on all the
selected channels. The conversion results can then be read from
the AD7865 using successive read operations. Alternately, one
can use the
EOC pulse to interrupt the ADSP-210x when the
conversion on each channel is complete when reading between
each conversion in the conversion sequence (Figure 8). The
AD7865 is read using the following instruction
MR0 = DM(ADC)
where MR0 is the ADSP-210x MR0 register and ADC is the
AD7865 address.
CS
RD
WR
BUSY
CONVST
DB0–DB13
AD7865
VIN1
VIN2
VIN3
VIN4
DT1/F0
IRQn
RD
WR
D0–D13
DMS
A0–A13
ADSP-21xx
ADDRESS
DECODE
Figure 19. AD7865–ADSP-21xx Interface
AD7865–TMS320C5x Interface
Figure 20 shows an interface between the AD7865 and the
TMS320C5x. As with the previous interfaces, conversion can be
initiated from the TMS320C5x or from an external source and
the processor is interrupted when the conversion sequence is
completed. The
CS signal to the AD7865 derived from the DS
signal and a decode of the address bus. This maps the AD7865
into external data memory. The
RD signal from the TMS320 is
used to enable the ADC data onto the data bus. The AD7865
has a fast parallel bus so there are no wait state requirements.
The following instruction is used to read the conversion results
from the AD7865:
IN D,ADC
where D is Data Memory address and ADC is the AD7865
address.
PA0
INTn
DS
TMS320C5x
CS
RD
WR
BUSY
CONVST
DB0–DB13
AD7865
VIN1
VIN2
VIN3
VIN4
RD
WR
D0–D13
A0–A13
ADDRESS
DECODE
Figure 20. AD7865–TMS320C5x Interface
AD7865–MC68000 Interface
An interface between the AD7865 and the MC68000 is shown
in Figure 21. The conversion can be initiated from the MC68000
or from an external source. The AD7865 BUSY line can be
used to interrupt the processor or, alternatively, software delays
can ensure that conversion has been completed before a read to
the AD7865 is attempted. Because of the nature of its inter-
rupts, the 68000 requires additional logic (not shown in Figure
21) to allow it to be interrupted correctly. For further informa-
tion on 68000 interrupts, consult the 68000 users manual.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD7865BSZ-3REEL | 功能描述:IC ADC 14BIT 4CHAN 5V 44-MQFP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1 系列:- 位数:14 采样率（每秒）:83k 数据接口:串行，并联 转换器数目:1 功率耗散（最大）:95mW 电压电源:双 ± 工作温度:0°C ~ 70°C 安装类型:通孔 封装/外壳:28-DIP（0.600"，15.24mm） 供应商设备封装:28-PDIP 包装:管件 输入数目和类型:1 个单端，双极 |
| AD7865YS-1 | 制造商:AD 制造商全称:Analog Devices 功能描述:Four-Channel, Simultaneous Sampling, Fast, 14-Bit ADC |
| AD7865YS-1REEL | 制造商:Analog Devices 功能描述:ADC Single SAR 350ksps 14-bit Parallel 44-Pin MQFP T/R |
| AD7865YS-2 | 制造商:Analog Devices 功能描述:ADC Single SAR 350ksps 14-bit Parallel 44-Pin MQFP 制造商:Rochester Electronics LLC 功能描述:4 CH. SIMULTANEOUS BIPOLAR,14-B ADC I.C. - Bulk |
| AD7865YS-3 | 制造商:Analog Devices 功能描述:ADC Single SAR 350ksps 14-bit Parallel 44-Pin MQFP |
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