参数资料
| 型号： | AD7721AR |
| 厂商： | Analog Devices Inc |
| 文件页数： | 4/16页 |
| 文件大小： | 0K |
| 描述： | IC ADC 16BIT SIGMA-DELTA 28-SOIC |
| 标准包装： | 27 |
| 位数： | 16 |
| 采样率（每秒）： | 468.75k |
| 数据接口： | 串行，并联 |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 150mW |
| 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： | 28-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 28-SOIC W |
| 包装： | 管件 |
| 输入数目和类型： | 1 个差分，单极；1 个差分，双极 |
AD7721
REV. A
–12–
PARALLEL INTERFACE
Read Operation
The device defaults to parallel mode if
CS, RD and WR are not
tied to DGND together. Figure 11 shows a timing diagram for
reading from the AD7721 in the parallel mode. When operating
the device in parallel mode,
CS and RD should be tied to
DGND permanently except when control information is being
written to the AD7721.
DRDY goes high for 2 clock cycles to
indicate that new data is available from the interface. The
AD7721 outputs this data after the falling edge of
DRDY. This
DRDY pin can be used to drive an edge-triggered interrupt of a
microprocessor.
Write Operation
The write operation is used to write data into the control regis-
ter. The outputs of the control register select the analog input
range, allow the part to be put into power-down (standby)
mode, define the function of the DVAL/
SYNC pin, and initiate
the calibration routine. After power-up and after at least 16
clock cycles, the control register must be written to. A cali-
bration must also be performed at least once after power-up to
set the calibration registers. The function of each bit in the
control register is shown in Table I. When writing to the con-
trol register, the
RD pin must be taken high so that the pins D0
to D11 are configured as inputs.
DATA OUT (O)
SCLK (O)
DB0
DB10
DB11
DB12
DB13
DB14
DB15
RFS (I) / DRDY (O)
t2
t3
t4
t5
t6
t8
NOTE: (I) SIGNIFIES AN INPUT; (O) SIGNIFIES AN OUTPUT.
t1
t
9
t7
Figure 10. Serial Mode Output Register Read
DRDY (O)
DB0–DB11 (O)
RD (I)
CS (I)
t12
t11
NOTE: (I) SIGNIFIES AN INPUT; (O) SIGNIFIES AN OUTPUT.
t10
Figure 11. Parallel Mode Output Register Read
NOTE: (I) SIGNIFIES AN INPUT; (O) SIGNIFIES AN OUTPUT.
WR (I)
VALID DATA
CS (I)
DB0–DB11 (I)
t14
t15
t13
Figure 12. Write Timing Diagram
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD7721AR-REEL | 制造商:Analog Devices 功能描述:ADC Single Delta-Sigma 468.75ksps 16-bit Parallel/Serial 28-Pin SOIC W T/R |
| AD7721ARZ | 功能描述:IC ADC 16BIT SIGMA-DELTA 28SOIC RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 其它有关文件:TSA1204 View All Specifications 标准包装:1 系列:- 位数:12 采样率（每秒）:20M 数据接口:并联 转换器数目:2 功率耗散（最大）:155mW 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-TQFP 供应商设备封装:48-TQFP（7x7） 包装:Digi-Reel® 输入数目和类型:4 个单端，单极；2 个差分，单极 产品目录页面:1156 (CN2011-ZH PDF) 其它名称:497-5435-6 |
| AD7721ARZ-REEL | 功能描述:IC ADC 16BIT SIGMA-DELTA 28SOIC 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 |
| AD7721SQ | 制造商:AD 制造商全称:Analog Devices 功能描述:CMOS 16-Bit, 468.75 kHz, Sigma-Delta ADC |
| AD7722 | 制造商:AD 制造商全称:Analog Devices 功能描述:16-Bit, 195 kSPS CMOS, Sigma-Delta ADC |
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