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| 型号： | AD7985BCPZ-RL7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 9/28页 |
| 文件大小： | 0K |
| 描述： | IC ADC 16B 2.5MSPS PULSR 20LFCSP |
| 标准包装： | 1,500 |
| 系列： | PulSAR® |
| 位数： | 16 |
| 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： | 带卷 (TR) |
| 输入数目和类型： | 1 个伪差分，单极 |
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AD7985
Rev. A | Page 17 of 28
DIGITAL INTERFACE
Although the AD7985 has a reduced number of pins, it offers
flexibility in its serial interface modes.
In CS mode, the AD7985 is compatible with SPI, MICROWIRE,
QSPI, and digital hosts. In CS mode, the AD7985 can use either
a 3-wire or a 4-wire interface. A 3-wire interface that uses the
CNV, SCK, and SDO signals minimizes wiring connections,
which is useful, for example, in isolated applications. A 4-wire
interface that uses the SDI, CNV, SCK, and SDO signals allows
CNV, which initiates conversions, to be independent of the
readback timing (SDI). This is useful in low jitter sampling
or simultaneous sampling applications.
In chain mode, the AD7985 provides a daisy-chain feature that
uses the SDI input for cascading multiple ADCs on a single data
line similar to a shift register. Chain mode is available only in
normal mode (TURBO is low).
The mode in which the part operates depends on the SDI level
when the CNV rising edge occurs. CS mode is selected if SDI
is high, and chain mode is selected if SDI is low. The SDI hold
time is such that when SDI and CNV are connected together,
chain mode is always selected.
In normal mode operation, the AD7985 offers the option of
forcing a start bit in front of the data bits. This start bit can be
used as a busy signal indicator to interrupt the digital host and
trigger the data reading. Otherwise, without a busy indicator,
the user must time out the maximum conversion time prior to
readback.
The busy indicator feature is enabled in CS mode if CNV or
SDI is low when the ADC conversion ends (see Figure 29 and
Figure 33). TURBO must be kept low for both digital interfaces.
When CNV is low, readback can occur during conversion or
acquisition, or it can be split across acquisition and conversion,
as described in the following sections.
A discontinuous SCK is recommended because the part is selected
with CNV low, and SCK activity begins to clock out data.
Note that in the following sections, the timing diagrams indicate
digital activity (SCK, CNV, SDI, and SDO) during the conversion.
However, due to the possibility of performance degradation, digi-
tal activity should occur only prior to the safe data reading time,
tDATA, because the AD7985 provides error correction circuitry
that can correct for an incorrect bit decision during this time.
From tDATA to tCONV, there is no error correction, and conversion
results may be corrupted.
Similarly, tQUIET, the time from the last falling edge of SCK to
the rising edge of CNV, must remain free of digital activity.
The user should configure the AD7985 and initiate the busy
indicator (if desired in normal mode) prior to tDATA.
It is also possible to corrupt the sample by having SCK near the
sampling instant. Therefore, it is recommended that the digital
pins be kept quiet for approximately 20 ns before and 10 ns after
the rising edge of CNV, using a discontinuous SCK whenever
possible to avoid any potential performance degradation.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD7986 | 制造商:AD 制造商全称:Analog Devices 功能描述:1 nV/√Hz, Low Power |
| AD7986BCPZ | 功能描述:IC ADC 18BIT 2MSPS SAR 20LFCSP 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 |
| AD7986BCPZ-RL7 | 功能描述:IC ADC 18BIT 2MSPS SAR 20LFCSP 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 系列:- 位数:14 采样率（每秒）:83k 数据接口:串行，并联 转换器数目:1 功率耗散（最大）:95mW 电压电源:双 ± 工作温度:0°C ~ 70°C 安装类型:通孔 封装/外壳:28-DIP（0.600"，15.24mm） 供应商设备封装:28-PDIP 包装:管件 输入数目和类型:1 个单端，双极 |
| AD7986BCPZ-U1 | 制造商:Analog Devices 功能描述:16-BIT, 10MSPS PULSAR DIFFERENTIAL ADC - Rail/Tube |
| AD7986XCPZ-U1 | 制造商:Analog Devices 功能描述:16-BIT, 10MSPS PULSAR DIFFERENTIAL ADC - Rail/Tube |
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