参数资料
| 型号： | AD7927BRU |
| 厂商： | Analog Devices Inc |
| 文件页数： | 17/28页 |
| 文件大小： | 0K |
| 描述： | IC ADC 12BIT 8CH 200KSPS 20TSSOP |
| 标准包装： | 75 |
| 位数： | 12 |
| 采样率（每秒）： | 200k |
| 数据接口： | DSP，MICROWIRE?，QSPI?，串行，SPI? |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 7.5mW |
| 电压电源： | 单电源 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 20-TSSOP |
| 包装： | 管件 |
| 输入数目和类型： | 8 个单端，单极 |
| 配用： | EVAL-AD7927CBZ-ND - BOARD EVALUATION FOR AD7927 |
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AD7927
Data Sheet
Rev. D | Page 24 of 28
MICROPROCESSOR INTERFACING
The serial interface on the AD7927 allows the part to be directly
connected to a range of many different microprocessors. This
section explains how to interface the AD7927 with some of the
more common microcontroller and DSP serial interface protocols.
AD7927 TO TMS320C541
The serial interface on the TMS320C541 uses a continuous serial
clock and frame synchronization signals to synchronize the
data transfer operations with peripheral devices like the AD7927.
The CS input allows easy interfacing between the TMS320C541
and the AD7927 without any glue logic required. The serial port
of the TMS320C541 is set up to operate in burst mode with inter-
nal CLKX0 (TX serial clock on Serial Port 0) and FSX0 (TX
frame sync from Serial Port 0). The serial port control register
(SPC) must have the following setup: FO = 0, FSM = 1, MCM =
1, and TXM = 1. The connection diagram is shown in Figure 29.
It should be noted that for signal processing applications, it is
imperative that the frame synchronization signal from the
TMS320C541 provides equidistant sampling. The VDRIVE pin
of the AD7927 takes the same supply voltage as that of the
TMS320C541. This allows the ADC to operate at a higher
voltage than the serial interface, that is, TMS320C541, if
necessary.
CLKX
CLKR
DR
DT
FSX
FSR
SCLK
DOUT
DIN
VDRIVE
TMS320C541*
VDD
*ADDITIONAL PINS REMOVED FOR CLARITY.
AD7927*
CS
03
08
8-
02
9
Figure 29. Interfacing to the TMS320C541
AD7927 TO ADSP-21xx
The ADSP-21xx family of DSPs is interfaced directly to the
AD7927 without any glue logic required. The VDRIVE pin of the
AD7927 takes the same supply voltage as that of the ADSP-218x.
This allows the ADC to operate at a higher voltage than the
serial interface, that is, ADSP-218x, if necessary.
The SPORT0 control register should be set up as follows:
TFSW = RFSW = 1, alternate framing
INVRFS = INVTFS = 1, active low frame signal
DTYPE = 00, right justify data
SLEN = 1111, 16-bit data-words
ISCLK = 1, internal serial clock
TFSR = RFSR = 1, frame every word
IRFS = 0
ITFS = 1
The connection diagram is shown in Figure 30. The ADSP-218x
has the TFS and RFS of the SPORT0 tied together, with TFS set
as an output and RFS set as an input. The DSP operates in alter-
nate framing mode and the SPORT0 control register is set up as
described. The frame synchronization signal generated on the
TFS is tied to CS, and as with all signal processing applications
equidistant sampling is necessary. However, in this example, the
timer interrupt is used to control the sampling rate of the ADC,
and under certain conditions, equidistant sampling may not be
achieved.
SCLK
DR
RFS
TFS
DT
SCLK
DOUT
DIN
ADSP-218x*
AD7927*
CS
VDRIVE
VDD
*ADDITIONAL PINS REMOVED FOR CLARITY.
03
08
8-
0
30
Figure 30. Interfacing to the ADSP-218x
The timer register, for instance, is loaded with a value that
provides an interrupt at the required sample interval. When
an interrupt is received, a value is transmitted with TFS or DT,
(ADC control word). The TFS is used to control the RFS and
therefore the reading of data. The frequency of the serial clock
is set in the SCLKDIV register. When the instruction to transmit
with TFS is given (that is, AX0 = TX0), the state of the SCLK is
checked. The DSP waits until the SCLK has gone high, low, and
high before transmission starts. If the timer and SCLK values
are chosen such that the instruction to transmit occurs on or
near the rising edge of SCLK, then the data may be transmitted
or it may wait until the next clock edge.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD7927BRU-REEL | 制造商:Analog Devices 功能描述:ADC Single SAR 200ksps 12-bit Serial 20-Pin TSSOP T/R 制造商:Analog Devices 功能描述:ADC SGL SAR 200KSPS 12-BIT SERL 20TSSOP - Tape and Reel |
| AD7927BRU-REEL7 | 制造商:Analog Devices 功能描述:ADC Single SAR 200ksps 12-bit Serial 20-Pin TSSOP T/R |
| AD7927BRUZ | 功能描述:IC ADC 12BIT 8CH 200KSPS 20TSSOP 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:microPOWER™ 位数:8 采样率（每秒）:1M 数据接口:串行，SPI? 转换器数目:1 功率耗散（最大）:- 电压电源:模拟和数字 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:24-VFQFN 裸露焊盘 供应商设备封装:24-VQFN 裸露焊盘（4x4） 包装:Digi-Reel® 输入数目和类型:8 个单端，单极 产品目录页面:892 (CN2011-ZH PDF) 其它名称:296-25851-6 |
| AD7927BRUZ | 制造商:Analog Devices 功能描述:IC 12BIT ADC SMD 7927 TSSOP20 |
| AD7927BRUZ-REEL | 功能描述:IC ADC 12BIT 8CH W/SEQ 20TSSOP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:2,500 系列:- 位数:16 采样率（每秒）:15 数据接口:MICROWIRE?，串行，SPI? 转换器数目:1 功率耗散（最大）:480µW 电压电源:单电源 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:38-WFQFN 裸露焊盘 供应商设备封装:38-QFN（5x7） 包装:带卷 (TR) 输入数目和类型:16 个单端，双极；8 个差分，双极 配用:DC1011A-C-ND - BOARD DELTA SIGMA ADC LTC2494 |
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