参数资料
型号: AD7944BCPZ
厂商: Analog Devices Inc
文件页数: 16/28页
文件大小: 0K
描述: IC ADC 14BIT 2.5MSPS 20LFCSP
标准包装: 1
系列: PulSAR®
位数: 14
采样率(每秒): 2.5M
数据接口: DSP,MICROWIRE?,QSPI?,串行,SPI?
转换器数目: 1
功率耗散(最大): 33mW
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: 20-VFQFN 裸露焊盘,CSP
供应商设备封装: 20-LFCSP-VQ
包装: 托盘
输入数目和类型: 1 个伪差分,单极
产品目录页面: 780 (CN2011-ZH PDF)
AD7944
Rev. A | Page 23 of 28
CHAIN MODE WITHOUT BUSY INDICATOR
This mode can be used to daisy-chain multiple AD7944 devices on
a 3-wire serial interface. It is available only in normal conversion
mode (TURBO is low). This feature is useful for reducing com-
ponent count and wiring connections, for example, in isolated
multiconverter applications or for systems with a limited inter-
facing capacity. Data readback is analogous to clocking a shift
register. A connection diagram example using two AD7944
devices is shown in Figure 34, and the corresponding timing is
When SDI and CNV are low, SDO is driven low. With SCK low,
a rising edge on CNV initiates a conversion, selects chain mode,
and disables the busy indicator. In this mode, CNV is held high
during the conversion phase and the subsequent data readback.
When the conversion is complete, the MSB is output onto SDO,
and the AD7944 enters the acquisition phase and powers down.
The remaining data bits stored in the internal shift register are
clocked by subsequent SCK falling edges. For each ADC, SDI
feeds the input of the internal shift register and is clocked by the
SCK falling edge. Each ADC in the chain outputs its data MSB
first, and 14 × N clocks are required to read back the N ADCs.
The data is valid on both SCK edges. Although the rising edge
can be used to capture the data, a digital host using the SCK
falling edge allows a faster reading rate and, consequently, more
AD7944 devices in the chain, provided that the digital host has
an acceptable hold time. The maximum conversion rate may be
reduced due to the total readback time.
CONVERT
DATA IN
CLK
DIGITAL HOST
AD7944
SDI
SDO
CNV
B
SCK
AD7944
SDI
SDO
CNV
A
SCK
TURBO
04658-
017
Figure 34. Chain Mode Without Busy Indicator Connection Diagram
TURBO = 0
SDOA = SDIB
DA13
DA12
DA11
SCK
1
2
3
26
27
28
tSSDISCK
tHSDISCK
tEN
CONVERSION
ACQUISITION
tCONV
tCYC
tACQ
ACQUISITION
CNV
DA1
12
13
tSCK
tSCKL
tSCKH
DA0
15
16
14
SDIA = 0
SDOB
DB13
DB12
DB11
DA1
DB1
DB0
DA13
DA12
tHSDO
tDSDO
tQUIET
tHSCKCNV
DA0
04658-
018
Figure 35. Chain Mode Without Busy Indicator Serial Interface Timing
相关PDF资料
PDF描述
AD7946BCPZRL7 IC ADC 14BIT 500KSPS 10-LFCSP
AD7948BN IC DAC 12BIT MULT PARALL 20-DIP
AD7949BCPZRL7 IC ADC 14BIT 250KSPS 8CH 20LFCSP
AD7951BSTZRL IC ADC 14BIT 1MSPS 48-LQFP
AD7952BCPZ IC ADC 14BIT DIFF 1MSPS 48LFCSP
相关代理商/技术参数
参数描述
AD7944BCPZ-RL7 功能描述:IC ADC 14B 2.5MSPS PULSR 20LFCSP 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
AD7945 制造商:AD 制造商全称:Analog Devices 功能描述:+3.3 V/+5 V Multiplying 12-Bit DACs
AD7945AN-B 功能描述:IC DAC 12BIT MULT PARALL 20-DIP 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):*
AD7945ANZ-B 功能描述:IC DAC 12BIT MULT PARALL 20DIP 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):*
AD7945ARS-B 功能描述:IC DAC 12BIT MULT PARALL 20-SSOP RoHS:否 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):*