参数资料
| 型号： | AD7849ANZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 9/20页 |
| 文件大小： | 0K |
| 描述： | IC DAC 16BIT SERIAL INP 20DIP |
| 产品培训模块： | Data Converter Fundamentals DAC Architectures |
| 标准包装： | 18 |
| 设置时间： | 7µs |
| 位数： | 14 |
| 数据接口： | 串行 |
| 转换器数目： | 1 |
| 电压电源： | 模拟和数字，双 ± |
| 功率耗散（最大）： | 100mW |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 20-DIP（0.300"，7.62mm） |
| 供应商设备封装： | 20-PDIP |
| 包装： | 管件 |
| 输出数目和类型： | 1 电压，单极；1 电压，双极 |
| 采样率（每秒）： | 143k |
AD7849
Rev. C | Page 17 of 20
APPLICATIONS INFORMATION
OPTO-ISOLATED INTERFACE
In many process control applications, it is necessary to provide
an isolation barrier between the controller and the unit being
controlled. Opto-isolators can provide voltage isolation in
excess of 3 kV. The serial loading structure of the AD7849
makes it ideal for opto-isolated interfaces because the number
of interface lines is kept to a minimum.
The DCEN pin must be connected high to enable the daisy-chain
facility. Four channels with 14-bit or 16-bit resolution are provided
in the circuit shown, but this can be expanded to accommodate
any number of DAC channels without any extra isolation circuitry.
The only limitation is the output update rate. For example, if an
output update rate of 10 kHz is required, then all DACs must be
loaded and updated in 100 μs. Operating at the maximum clock
rate of 5 MHz means that it takes 3.2 μs to load a DAC. This means
that the total number of channels for this update rate is 31, which
leaves 800 ns for the LDAC pulse. Of course, as the update rate
requirement decreases, the number of possible channels increases.
The sequence of events to program the output channels in
Figure 28 is as follows:
1.
Take the SYNC line low.
2.
Transmit the data as four 16-bit words. A total of 64 clock
pulses is required to clock the data through the chain.
3.
Take the SYNC line high.
4.
Pulse the LDAC line low. This updates all output channels
simultaneously on the falling edge of LDAC.
To reduce the number of optocouplers, the LDAC line can be
driven from one shot that is triggered by the rising edge on the
SYNC line. A low level pulse of 100 ns duration or greater is all
that is required to update the outputs.
VDD
DATA OUT
CLOCK OUT
SYNC OUT
CONTROL OUT
CONTROLLER
VOUTA
VOUTB
VOUTC
VOUTD
5V
QUAD OPTO-COUPLER
*ADDITIONAL PINS OMITTED FOR CLARITY.
LDAC
SDIN
VOUT
DCEN
SDOUT
AD7849*
5V
LDAC
SDIN
VOUT
DCEN
SDOUT
AD7849*
5V
LDAC
SDIN
VOUT
DCEN
SDOUT
AD7849*
5V
SCLK
SYNC
LDAC
SDIN
VOUT
DCEN
SDOUT
AD7849*
0
1008-
031
SCLK
SYNC
SCLK
SYNC
SCLK
SYNC
Figure 28. 4-Channel Opto-Isolated Interface
相关PDF资料 |
PDF描述 |
|---|---|
| VE-2T3-IV-F2 | CONVERTER MOD DC/DC 24V 150W |
| LTC1650ACS#TRPBF | IC D/A CONV 16BIT R-R 16-SOIC |
| VE-2T2-IV-F1 | CONVERTER MOD DC/DC 15V 150W |
| LTC1650ACS#TR | IC DAC 16BIT R-R VOLT OUT 16SOIC |
| VE-2T1-IV-F1 | CONVERTER MOD DC/DC 12V 150W |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AD7849AR | 功能描述:IC DAC 16BIT SRL INP 20-SOIC RoHS:否 类别:集成电路 (IC) >> 数据采集 - 数模转换器 系列:- 产品培训模块:Data Converter Fundamentals DAC Architectures 标准包装:750 系列:- 设置时间:7µs 位数:16 数据接口:并联 转换器数目:1 电压电源:双 ± 功率耗散（最大）:100mW 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:28-LCC（J 形引线） 供应商设备封装:28-PLCC（11.51x11.51） 包装:带卷 (TR) 输出数目和类型:1 电压，单极；1 电压，双极 采样率（每秒）:143k |
| AD7849AR-REEL | 功能描述:IC DAC 16BIT SRL INP 20-SOIC RoHS:否 类别:集成电路 (IC) >> 数据采集 - 数模转换器 系列:- 标准包装:2,400 系列:- 设置时间:- 位数:18 数据接口:串行 转换器数目:3 电压电源:模拟和数字 功率耗散（最大）:- 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:36-TFBGA 供应商设备封装:36-TFBGA 包装:带卷 (TR) 输出数目和类型:* 采样率（每秒）:* |
| AD7849ARZ | 功能描述:IC DAC 14/16BIT SRL-IN 20-SOIC RoHS:是 类别:集成电路 (IC) >> 数据采集 - 数模转换器 系列:- 标准包装:1 系列:- 设置时间:4.5µs 位数:12 数据接口:串行，SPI? 转换器数目:1 电压电源:单电源 功率耗散（最大）:- 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 供应商设备封装:8-SOICN 包装:剪切带 (CT) 输出数目和类型:1 电压，单极；1 电压，双极 采样率（每秒）:* 其它名称:MCP4921T-E/SNCTMCP4921T-E/SNRCTMCP4921T-E/SNRCT-ND |
| AD7849ARZ-REEL | 功能描述:IC DAC 14/16BIT SRL-IN 20-SOIC RoHS:是 类别:集成电路 (IC) >> 数据采集 - 数模转换器 系列:- 标准包装:47 系列:- 设置时间:2µs 位数:14 数据接口:并联 转换器数目:1 电压电源:单电源 功率耗散（最大）:55µW 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:28-SSOP（0.209"，5.30mm 宽） 供应商设备封装:28-SSOP 包装:管件 输出数目和类型:1 电流，单极；1 电流，双极 采样率（每秒）:* |
| AD7849BN | 制造商:Analog Devices 功能描述:DAC 1-CH R-2R 16-bit 20-Pin PDIP N Tube 制造商:Rochester Electronics LLC 功能描述:SERIAL INPUT,16-BIT DAC I.C. - Bulk |
发布紧急采购，3分钟左右您将得到回复。