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参数资料
| 型号： | AD7856ARZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 19/32页 |
| 文件大小： | 0K |
| 描述： | IC ADC 14BIT 8CHAN 5V 24SOIC |
| 标准包装： | 31 |
| 位数： | 14 |
| 采样率（每秒）： | 285k |
| 数据接口： | 8051，QSPI?，串行，SPI? µP |
| 转换器数目： | 2 |
| 功率耗散（最大）： | 89.25mW |
| 电压电源： | 模拟和数字 |
| 工作温度： | -40°C ~ 105°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 W |
| 包装： | 管件 |
| 输入数目和类型： | 8 个单端，单极；4 个伪差分，单极 |
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AD7856
–26–
REV. A
CONFIGURING THE AD7856
The AD7856 contains 14 on-chip registers that can be accessed
via the serial interface. In the majority of applications it will not
be necessary to access all of these registers. Here the CLKIN
signal is applied directly after power-on, the CLKIN signal must
be present to allow the part to perform a calibration. This auto-
matic calibration will be completed approximately 150 ms
after power-on.
Writing to the AD7856
For accessing the on-chip registers it is necessary to write to the
part. To change the channel from the default channel setting the
user will be required to write to the part. To enable Serial Inter-
face Mode 1 the user must also write to the part. Figures 34 and
35 outline flowcharts of how to configure the AD7856 Serial
Interface Modes 1 and 2 respectively. The continuous loops on
all diagrams indicate the sequence for more than one conversion.
START
POWER-ON, APPLY CLKIN SIGNAL,
WAIT 150ms FOR AUTOMATIC CALIBRATION
APPLY
SYNC (IF REQUIRED), SCLK,
WRITE TO CONTROL REGISTER
SETTING CHANNEL AND TWO-WIRE MODE
PULSE
CONVST PIN
WAIT FOR BUSY SIGNAL TO GO LOW
OR
WAIT FOR BUSY BIT = 0
1
SERIAL
INTERFACE
MODE
?
READ
DATA
DURING
CONVERSION
?
NO
YES
APPLY
SYNC (IF REQUIRED), SCLK, READ
CURRENT CONVERSION RESULT ON DIN PIN
APPLY
SYNC (IF REQUIRED), SCLK, READ
PREVIOUS CONVERSION RESULT ON DIN PIN
WAIT APPROX. 200 ns AFTER
CONVST RISING EDGE OR AFTER END
OF CONTROL REGISTER WRITE
Figure 34. Flowchart for Setting Up, Reading and Writing in Interface Mode 1
The options of using a hardware (pulsing the
CONVST pin) or
software (setting the CONVST bit to 1) conversion start, and
reading/writing during or after conversion are shown in Figures
34 and 35. If the
CONVST pin is never used, it should be
permanently tied to DVDD. Where reference is made to the
BUSY bit equal to a Logic 0, to indicate the end of conversion,
the user in this case would poll the BUSY bit in the status register.
Interface Mode 1 Configuration
Figure 34 shows the flowchart for configuring the part in Inter-
face Mode 1. This mode of operation can only be enabled by
writing to the control register and setting the 2/
3 MODE bit.
Reading and writing cannot take place simultaneously in this
mode as the DIN pin is used for both reading and writing.
Initiating conversions in software is not recommended in this
mode, see Detailed Timing section.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD7856ARZ-REEL7 | 功能描述:IC ADC 14BIT 8CHAN 5V 24SOIC RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 位数:12 采样率（每秒）:3M 数据接口:- 转换器数目:- 功率耗散（最大）:- 电压电源:- 工作温度:- 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-23-6 包装:带卷 (TR) 输入数目和类型:- |
| AD7856KR | 制造商:Analog Devices 功能描述:ADC Single SAR 285ksps 14-bit Serial 24-Pin SOIC W 制造商:Rochester Electronics LLC 功能描述:8 CH. 14-BIT 300 KSPS ADC I.C. - Bulk |
| AD7856KR-REEL | 功能描述:IC ADC 14BIT 8CH 5V 24-SOIC RoHS:否 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 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 |
| AD7856KR-REEL7 | 制造商:Analog Devices 功能描述:ADC Single SAR 285ksps 14-bit Serial 24-Pin SOIC W T/R 制造商:Rochester Electronics LLC 功能描述:8 CH. 14-BIT 300 KSPS ADC I.C. - Tape and Reel |
| AD7856KRZ | 功能描述:IC ADC 14BIT 8CHAN 5V 24SOIC RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1,000 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 |
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