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参数资料
| 型号： | ADS7812PG4 |
| 厂商： | Texas Instruments |
| 文件页数： | 8/24页 |
| 文件大小： | 0K |
| 描述： | IC 12BIT 35MW SER OUT ADC 16DIP |
| 产品培训模块： | Data Converter Basics |
| 标准包装： | 25 |
| 位数： | 12 |
| 采样率（每秒）： | 40k |
| 数据接口： | 串行，SPI? |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 35mW |
| 电压电源： | 单电源 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 16-DIP（0.300"，7.62mm） |
| 供应商设备封装： | 16-PDIP |
| 包装： | 管件 |
| 输入数目和类型： | 3 个单端，单极；3 个单端，双极 |
ADS7812
16
SBAS042A
www.ti.com
Keep in mind that the time period when the comparator is
most sensitive to noise is fairly small. Also, the peak portion
of the noise “event” produced by a digital transition is fairly
brief as most digital signals transition in a few nanoseconds.
The subsequent noise may last for a period of time longer
than this and may induce further effects which require a
longer settling time; however, in general, the event is over
within a few tens of nanoseconds.
For the ADS7812, error correction is done when the tenth bit
is decided. During this bit decision, it is possible to correct
limited errors that may have occurred during previous bit
decisions. However, after the tenth bit, no such correction is
possible. Note that for the timing diagrams shown in Figures
2, 5, 6, 7, and 8, all external digital signals should remain
static from 8
s after the start of a conversion until BUSY
rises. The tenth bit is decided approximately 10
s to 11s
into the conversion.
APPLICATIONS INFORMATION
QSPI INTERFACING
Figure 14 shows a simple interface between the ADS7812
and any queued serial peripheral interface (QSPI) equipped
microcontroller (available on several Motorola devices).
This interface assumes that the convert pulse does not
originate from the microcontroller and that the ADS7812 is
the only serial peripheral.
Before enabling the QSPI interface, the microcontroller must
be configured to monitor the slave select (SS) line. When a
LOW to HIGH transition occurs (indicating the end of a
conversion), the port can be enabled. If this is not done, the
microcontroller and A/D converter may not be properly syn-
chronized. (The slave select line simply enables communica-
tion—it does not indicate the start or end of a serial transfer.)
three converters. After the conversions are finished, each
result is transferred, in turn. The QSPI port is completely
programmable to handle the timing and transfers without
processor intervention. If the CONV signal is generated in
this way, it should be possible to make both AC and DC
measurements with the ADS7812, as the CONV signal will
have low jitter. Note that if the CONV signal is generated via
software commands, it will have a good deal of jitter and
only low frequency (DC) measurements can be made.
CONV
BUSY
DATA
DATACLK
CS
EXT/INT
ADS7812
PCS0/SS
MOSI
SCK
QSPI
CPOL = 0 (Inactive State is LOW)
CPHA = 1 (Data valid on falling edge)
QSPI port is in slave mode.
Convert Pulse
FIGURE 14. QSPI Interface to the ADS7812.
Figure 15 shows a QSPI-equipped microcontroller interfac-
ing to three ADS7812s. There are many possible variations
to this interface scheme. As shown, the QSPI port produces
a common CONV signal which initiates a conversion on all
CONV
CS
DATACLK
DATA
EXT/INT
ADS7812
PCS0
PCS1
PCS2
PCS3
SCK
MIS0
QSPI
CONV
CS
DATACLK
DATA
EXT/INT
ADS7812
CONV
CS
DATACLK
DATA
EXT/INT
ADS7812
+5V
FIGURE 15. QSPI Interface to the Three ADS7812s.
DSP56002 INTERFACING
The DSP56002 serial interface has an serial peripheral
interface (SPI) compatibility mode with some enhance-
ments. Figure 16 shows an interface between the ADS7812
and the DSP56002. As with the QSPI interface of Figure 14,
CONV
BUSY
DATA
DATACLK
CS
EXT/INT
ADS7812
SC1
SRD
SCO
DSP56002
SYN = 0 (Asychronous)
GCK = 1 (Gated clock)
SCD1 = 0 (SC1 is an input)
SHFD = 0 (Shift MSB first)
WL1 = 0 WL0 = 1 (Word length = 12 bits)
Convert Pulse
FIGURE 16. DSP56002 Interface to the ADS7812.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADS7812U | 功能描述:模数转换器 - ADC Low-Power Serial 12-Bit Sampling RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| ADS7812U | 制造商:Texas Instruments 功能描述:A/D Converter (A-D) IC 制造商:Texas Instruments 功能描述:IC, ADC, 12BIT, 40KSPS, SOIC-16 |
| ADS7812U/1K | 功能描述:模数转换器 - ADC Low-Pwr Serial 12B Sampling ADC Cnvrtr RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| ADS7812U/1KE4 | 功能描述:模数转换器 - ADC Low-Power Serial 12-Bit Sampling RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| ADS7812U/1KG4 | 功能描述:模数转换器 - ADC Low-Pwr Serial 12B Sampling ADC Cnvrtr RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
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