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参数资料
| 型号： | DC939A |
| 厂商： | Linear Technology |
| 文件页数： | 6/42页 |
| 文件大小： | 0K |
| 描述： | BOARD DELTA SIGMA ADC LTC2484 |
| 软件下载： | QuikEval System |
| 设计资源： | DC939A Design File DC939A Schematic |
| 标准包装： | 1 |
| 系列： | Easy Drive™, QuikEval™ |
| ADC 的数量： | 1 |
| 位数： | 24 |
| 采样率（每秒）： | 6.8 |
| 数据接口： | MICROWIRE?，串行，SPI? |
| 工作温度： | 0°C ~ 70°C |
| 已用 IC / 零件： | LTC2484 |
| 已供物品： | 板 |
| 相关产品： | LTC2484CDD#TRPBF-ND - IC ADC 24BIT 10-DFN LTC2484IDD#TRPBF-ND - IC ADC 24BIT 10-DFN LTC2484IDD#PBF-ND - IC ADC 24BIT 10-DFN LTC2484CDD#PBF-ND - IC ADC 24BIT 10-DFN |
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LTC2484
14
2484fd
APPLICATIONS INFORMATION
Through timing control of the CS and SCK pins, the LTC2484
offers several exible modes of operation (internal or
external SCK and free-running conversion modes). These
various modes do not require programming conguration
registers; moreover, they do not disturb the cyclic operation
described above. These modes of operation are described
in detail in the Serial Interface Timing Modes section.
Easy Drive Input Current Cancellation
The LTC2484 combines a high precision delta-sigma ADC
with an automatic differential input current cancellation
front end. A proprietary front-end passive sampling
network transparently removes the differential input
current. This enables external RC networks and high
impedance sensors to directly interface to the LTC2484
without external ampliers. The remaining common
mode input current is eliminated by either balancing the
differential input impedances or setting the common
mode input equal to the common mode reference (see
Automatic Input Current Cancellation section). This unique
architecture does not require on-chip buffers enabling
input signals to swing all the way to ground and up to
VCC. Furthermore, the cancellation does not interfere with
the transparent offset and full-scale autocalibration and
the absolute accuracy (full-scale + offset + linearity) is
maintained with external RC networks.
Accessing the Special Features of the LTC2484
The LTC2484 combines a high resolution, low noise
Σ
analog-to-digital converter with an on-chip selectable
temperature sensor, programmable digital lter and output
rate control. These special features are selected through a
single 8-bit serial input word during the data input/output
cycle (see Figure 2).
The LTC2484 powers up in a default mode commonly used
for most measurements. The device will remain in this
mode as long as the serial data input (SDI) is low. In this
default mode, the measured input is external, the digital
lter simultaneously rejects 50Hz and 60Hz line frequency
noise, and the speed mode is 1x (offset automatically,
continuously calibrated).
A simple serial interface grants access to any or all special
functions contained within the LTC2484. In order to change
the mode of operation, an enable bit (EN) followed by up
to 7 bits of data are shifted into the device (see Table 1).
The rst 3 bits, in order to remain pin-compatible with the
LTC2480, are don’t-cares and can be either HIGH or LOW.
The 4th bit (IM) is used to select the internal temperature
sensor as the conversion input, while the 5th and 6th bits
(FA, FB) combine to determine the line frequency rejection
mode. The 7th bit (SPD) is used to double the output rate
by disabling the offset auto calibration.
Temperature Sensor (IM)
The LTC2484 includes an on-chip temperature sensor.
The temperature sensor is selected by setting IM = 1 in
the serial input data stream. Conversions are performed
directly on the temperature sensor by the converter. While
operating in this mode, the device behaves as a temperature
to bits converter. The digital reading is proportional to the
absolute temperature of the device. This feature allows
the converter to linearize temperature sensors or continu-
ously remove temperature effects from external sensors.
Table 1. Selecting Special Modes
EN
2484 TBL1
IM FoA FoB
SPD
Comments
Keep Previous Mode
External Input, 50Hz and 60Hz Rejection, Autocalibration
External Input, 50Hz Rejection, Autocalibration
External Input, 60Hz Rejection, Autocalibration
External Input, 50Hz and 60Hz Rejection, 2x Speed
External Input, 50Hz Rejection, 2x Speed
External Input, 60Hz Rejection, 2x Speed
Temperature Input, 50Hz and 60Hz Rejection, Autocalibration
Temperature Input, 50Hz Rejection, Autocalibration
Temperature Input, 60Hz Rejection, Autocalibration
Reserved, Do Not Use
0
1
X
0
1
X
0
1
X
0
1
0
1
0
1
0
1
X
0
1
0
1
0
1
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