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参数资料
| 型号： | AD7675ASTZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 9/20页 |
| 文件大小： | 0K |
| 描述： | IC ADC 16BIT DIFF INP 48LQFP |
| 标准包装： | 1 |
| 系列： | PulSAR® |
| 位数： | 16 |
| 采样率（每秒）： | 100k |
| 数据接口： | 串行，并联 |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 25mW |
| 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： | 48-LQFP |
| 供应商设备封装： | 48-LQFP（7x7） |
| 包装： | 托盘 |
| 输入数目和类型： | 1 个差分，双极 |
| 配用： | EVAL-AD7675CBZ-ND - BOARD EVALUATION FOR AD7675 |
REV. A
AD7675
–17–
External Clock Data Read During Conversion
Figure 20 shows the detailed timing diagrams of this method.
During a conversion, while both
CS and RD are low, the result
of the previous conversion can be read. The data is shifted out,
MSB first, with 16 clock pulses, and is valid on both rising and
falling edges of the clock. The 16 bits have to be read before the
current conversion is complete. If that is not done, RDERROR is
pulsed high and can be used to interrupt the host interface to
prevent incomplete data reading. There is no “daisy chain”
feature in this mode, and RDC/SDIN input should always be
tied either high or low.
To reduce performance degradation due to digital activity, a fast
discontinuous clock of 18 MHz at least is recommended to ensure
that all the bits are read during the first half of the conversion
phase. For this reason, this mode is more difficult to use.
MICROPROCESSOR INTERFACING
The AD7675 is ideally suited for traditional dc measurement
applications supporting a microprocessor, and ac signal process-
ing applications interfacing to a digital signal processor. The
AD7675 is designed to interface either with a parallel 8-bit or
16-bit wide interface or with a general purpose serial port or I/O
ports on a microcontroller. A variety of external buffers can be
used with the AD7675 to prevent digital noise from coupling
into the ADC. The following sections illustrate the use of the
AD7675 with an SPI-equipped microcontroller, and the
ADSP-21065L and ADSP-218x signal processors.
SPI Interface (MC68HC11)
Figure 22 shows an interface diagram between the AD7675 and
an SPI-equipped microcontroller like the MC68HC11. To
accommodate the slower speed of the microcontroller, the
AD7675 acts as a slave device and data must be read after con-
version. This mode also allows the “daisy chain” feature. The
convert command could be initiated in response to an internal
timer interrupt. The reading of output data, one byte at a time if
necessary, could be initiated in response to the end-of-conversion
signal (BUSY going low) using an interrupt line of the micro-
controller. The Serial Peripheral Interface (SPI) on the MC68HC11
is configured for master mode (MSTR) = 1, Clock Polarity Bit
(CPOL) = 0, Clock Phase Bit (CPHA) = 1 and SPI interrupt
enable (SPIE) = 1 by writing to the SPI Control Register (SPCR).
The IRQ is configured for edge-sensitive-only operation
(IRQE = 1 in OPTION register).
CNVST
SDOUT
SCLK
D1
D0
X
D15
D14
D13
12
3
14
15
16
BUSY
INVSCLK = 0
CS
EXT/
INT = 1
RD = 0
t35
t36
t37
t31
t32
t16
t3
Figure 20. Slave Serial Data Timing for Reading (Read Previous Conversion during Convert)
BUSY
AD7675 #2
(UPSTREAM)
AD7675 #1
(DOWNSTREAM)
RDC/SDIN
SDOUT
CNVST
CS
SCLK
RDC/SDIN
SDOUT
CNVST
CS
SCLK
DATA
OUT
SCLK IN
CS IN
CNVST IN
BUSY
OUT
Figure 21. Two AD7675s in a “Daisy Chain” Configuration
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相关代理商/技术参数 |
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| AD7675ASTZRL | 功能描述:IC ADC 16BIT DIFF INP 48LQFP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:PulSAR® 标准包装:1,000 系列:- 位数:12 采样率（每秒）:300k 数据接口:并联 转换器数目:1 功率耗散（最大）:75mW 电压电源:单电源 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:24-SOIC（0.295"，7.50mm 宽） 供应商设备封装:24-SOIC 包装:带卷 (TR) 输入数目和类型:1 个单端，单极；1 个单端，双极 |
| AD7676 | 制造商:AD 制造商全称:Analog Devices 功能描述:16-Bit +-1 LSB INL, 500 kSPS, Differential ADC |
| AD7676ACP | 制造商:Analog Devices 功能描述:ADC SGL SAR 500KSPS 16BIT PARALLEL/SERL 48LFCSP - Trays |
| AD7676ACPRL | 制造商:Analog Devices 功能描述:ADC Single SAR 500ksps 16-bit Parallel/Serial 48-Pin LFCSP EP T/R |
| AD7676ACPZ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Analog Devices 功能描述: |
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