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参数资料
| 型号： | LTC2451CDDB#TRMPBF |
| 厂商： | Linear Technology |
| 文件页数： | 4/20页 |
| 文件大小： | 0K |
| 描述： | IC ADC 16BIT DELTA SIGMA 8DFN |
| 产品培训模块： | LTC2460 and LTC2450 Delta Sigma ADC Families |
| 标准包装： | 1 |
| 位数： | 16 |
| 采样率（每秒）： | 60 |
| 数据接口： | I²C，串行 |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 1.2mW |
| 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： | 8-WFDFN 裸露焊盘 |
| 供应商设备封装： | 8-DFN（3x2） |
| 包装： | 标准包装 |
| 输入数目和类型： | 1 个单端，单极 |
| 产品目录页面： | 1348 (CN2011-ZH PDF) |
| 其它名称： | LTC2451CDDB#TRMPBFDKR |
LTC2451
12
2451fg
Discarding a Conversion Result and Initiating a New
Conversion with Optional Configuration Updating
At the conclusion of a conversion cycle, a write cycle
can be initiated. Once the write cycle is acknowledged, a
STOP (P) command initiates a new conversion. If a new
configuration is required, this data can be written into the
device and a STOP command initiates a new conversion
(see Figure 8).
Synchronizing the LTC2451 with the Global Address Call
The LTC2451 can also be synchronized with the global
address call (see Figure 9). To achieve this, the LTC2451
must first have completed the conversion cycle. The
master issues a START, followed by the LTC2451 global
address 1110111, and a write request. The LTC2451 will
be selected and acknowledge the request. If desired, the
master then sends the write byte to program the 30Hz
or 60Hz mode. After the optional write byte, the master
ends the write operation with a STOP. This will update
the configuration registers (if a write byte was sent) and
initiate a new conversion on the LTC2451, as shown in
Figure 9. In order to synchronize the start of the conver-
sion without affecting the configuration registers, the
write operation can be aborted with a STOP. This initiates
a new conversion on the LTC2451 without changing the
configuration registers.
PRESERVING THE CONVERTER ACCURACY
TheLTC2451isdesignedtodramaticallyreducetheconver-
sion result’s sensitivity to device decoupling, PCB layout,
antialiasing circuits, line and frequency perturbations.
Nevertheless, in order to preserve the high accuracy capa-
bility of this part, some simple precautions are desirable.
Digital Signal Levels
Due to the nature of CMOS logic, it is advisable to keep
input digital signals near GND or VCC. Voltages in the
range of 0.5V to VCC – 0.5V may result in additional cur-
rent leakage from the part.
Driving VCC and GND
In relation to the VCC and GND pins, the LTC2451 com-
bines internal high frequency decoupling with damping
elements, which reduce the ADC performance sensitivity
to PCB layout and external components. Nevertheless, the
very high accuracy of this converter is best preserved by
careful low and high frequency power supply decoupling.
A 0.1F, high quality, ceramic capacitor in parallel with a
10F ceramic capacitor should be connected between the
VCC and GND pins, as close as possible to the package.
The 0.1F capacitor should be placed closest to the ADC.
Figure 8. Start a New Conversion without Reading Old Conversion Result
APPLICATIONS INFORMATION
Figure 9. Synchronize the LTC2451 with the Global Address Call
SLEEP
7-BIT ADDRESS
(0010100)
WRITE
(OPTIONAL)
S
P
W ACK
DATA INPUT
CONVERSION
2451 F08
GLOBAL ADDRESS
(1110111)
SLEEP
CONVERSION
S
W
ACK
WRITE (OPTIONAL)
P
2451 F09
DATA INPUT
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