参数资料
| 型号： | AD974BRS-RL7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 18/20页 |
| 文件大小： | 0K |
| 描述： | IC DAS 16BIT 4CH 200KSPS 28SSOP |
| 标准包装： | 500 |
| 类型： | 数据采集系统（DAS） |
| 分辨率（位）： | 16 b |
| 采样率（每秒）： | 200k |
| 数据接口： | 串行 |
| 电压电源： | 模拟和数字 |
| 电源电压： | 4.75 V ~ 5.25 V |
| 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： | 带卷 (TR) |
| 配用： | EVAL-AD974CB-ND - BOARD EVAL FOR AD974 |
REV. A
AD974
–7–
CONVERSION CONTROL
The AD974 is controlled by two signals: R/
C and CS. When
R/
C is brought low, with CS low, for a minimum of 50 ns, the
input signal will be held on the internal capacitor array and a
conversion “n” will begin. Once the conversion process does
begin, the
BUSY signal will go low until the conversion is com-
plete. Internally, the signals R/
C and CS are ORed together and
there is no requirement on which signal is taken low first when
initiating a conversion. The only requirement is that there be at
least 10 ns of delay between the two signals being taken low.
After the conversion is complete, the
BUSY signal will return
high and the AD974 will again resume tracking the input signal.
Under certain conditions the
CS pin can be tied Low and R/C
will be used to determine whether you are initiating a conver-
sion or reading data. On the first conversion, after the AD974 is
powered up, the DATA output will be indeterminate.
Conversion results can be clocked serially, using either an
internal clock generated by the AD974 or an external clock.
The AD974 is configured for the internal data clock mode by
pulling the EXT/
INT pin low. It is configured for the external
clock mode by pulling the EXT/
INT pin high.
INTERNAL DATA CLOCK MODE
The AD974 is configured to generate and provide the data clock
when the EXT/
INT pin is held low. Typically CS will be tied
low and R/
C will be used to initiate a conversion “n.” During
the conversion the AD974 will output 16 bits of data, MSB first,
from conversion “n-1” on the DATA pin. This data will be
synchronized with 16 clock pulses provided on the DATACLK
pin. The output data will be valid on both the rising and falling
edge of the data clock as shown in Figure 3. After the LSB has
been presented, the DATACLK pin will stay low until another
conversion is initiated.
In this mode, the digital input/output pins’ transitions are suit-
ably positioned to minimize degradation on the conversion
result, mainly during the second half of the conversion process.
EXTERNAL DATA CLOCK MODE
The AD974 is configured to accept an externally supplied data
clock when the EXT/
INT pin is held high. This mode of opera-
tion provides several methods by which conversion results can
be read. The output data from conversion “n-1” can be read
during conversion “n,” or the output data from conversion “n”
CS, R/C
BUSY
MODE
ACQUIRE
CONVERT
t1
CONVERT
ACQUIRE
t3
t2
t5
t6
t4
t7
t23
t25
t24
A0, A1
WR1, WR2
Figure 2. Basic Conversion Timing
R/
C
DATACLK
DATA
BUSY
1
MSB
VALID
BIT 14
VALID
t8
t1
t9
2
3
15
16
t10
t11
BIT 13
VALID
BIT 1
VALID
LSB
VALID
t2
t6
Figure 3. Serial Data Timing for Reading Previous Conversion Results with Internal Clock
(
CS and EXT/ INT Set to Logic Low)
相关PDF资料 |
PDF描述 |
|---|---|
| AD7874ARZ-REEL | IC DAS 12BIT 4CH 5V 28-SOIC |
| LTC6991IS6#TRPBF | IC OSC SILICON 977HZ TSOT23-6 |
| AD7891YSZ-1REEL | IC DAS 12BIT 8CH 44-MQFP |
| LTC6991IDCB#TRPBF | IC OSC SILICON 977HZ 6-DFN |
| VI-B5J-IU-F2 | CONVERTER MOD DC/DC 36V 200W |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AD974BRSZ | 功能描述:IC DAS 16BIT 4CH 200KSPS 28-SSOP RoHS:是 类别:集成电路 (IC) >> 数据采集 - ADCs/DAC - 专用型 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:50 系列:- 类型:数据采集系统（DAS） 分辨率（位）:16 b 采样率（每秒）:21.94k 数据接口:MICROWIRE?，QSPI?，串行，SPI? 电压电源:模拟和数字 电源电压:1.8 V ~ 3.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:40-WFQFN 裸露焊盘 供应商设备封装:40-TQFN-EP（6x6） 包装:托盘 |
| AD974BRZ | 功能描述:IC DAS 16BIT 4CH 200KSPS 28SOIC RoHS:是 类别:集成电路 (IC) >> 数据采集 - ADCs/DAC - 专用型 系列:- 产品培训模块:Data Converter Basics 标准包装:1 系列:- 类型:电机控制 分辨率（位）:12 b 采样率（每秒）:1M 数据接口:串行，并联 电压电源:单电源 电源电压:2.7 V ~ 3.6 V，4.5 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:100-TQFP 供应商设备封装:100-TQFP（14x14） 包装:剪切带 (CT) 其它名称:296-18373-1 |
| AD9750 | 制造商:AD 制造商全称:Analog Devices 功能描述:10-Bit, 125 MSPS High Performance TxDAC D/A Converter |
| AD9750AR | 制造商:Analog Devices 功能描述:DAC 1-CH Segment 10-bit 28-Pin SOIC W 制造商:Analog Devices 功能描述:DAC SGL 10-BIT 28SOIC - Rail/Tube 制造商:Rochester Electronics LLC 功能描述:10 BIT 12500 MSPS+ TXDAC D/A CONVERTER - Bulk 制造商:Analog Devices 功能描述:0BIT DAC POLY FUSE 9750 SOIC28 |
发布紧急采购，3分钟左右您将得到回复。