参数资料
型号: LTC2486IDE#PBF
厂商: Linear Technology
文件页数: 9/36页
文件大小: 0K
描述: IC ADC 16BIT W/PGA 14-DFN
标准包装: 91
位数: 16
采样率(每秒): 15
数据接口: MICROWIRE?,串行,SPI?
转换器数目: 1
功率耗散(最大): 800µW
电压电源: 单电源
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 14-WFDFN 裸露焊盘
供应商设备封装: 14-DFN-EP(4x3)
包装: 管件
输入数目和类型: 4 个单端,双极;2 个差分,双极
产品目录页面: 1348 (CN2011-ZH PDF)
配用: DC1009A-C-ND - BOARD DELTA SIGMA ADC LTC2486
LTC2486
17
2486fd
APPLICATIONS INFORMATION
The rst three bits shifted into the device consist of two
preamble bits and an enable bit. These bits are used to
enable the device conguration and input channel selec-
tion. Valid settings for these three bits are 000, 100 and
101. Other combinations should be avoided. If the rst
three bits are 000 or 100, the following data is ignored
(don’t care) and the previously selected input channel and
conguration remain valid for the next conversion.
If the rst three bits shifted into the device are 101, then
the next ve bits select the input channel for the next
conversion cycle (see Table 3).
The rst input bit (SGL) following the 101 sequence
determines if the input selection is differential (SGL =
0) or single-ended (SGL = 1). For SGL = 0, two adjacent
channels can be selected to form a differential input. For
SGL = 1, one of four channels is selected as the positive
input. The negative input is COM for all single ended
operations. The remaining four bits (ODD, A2, A1, A0)
determine which channel(s) is/are selected and the polarity
(for a differential input).
The next serial input bit immediately following the input
channel selection is the enable bit for the conversion
conguration (EN2). If this bit is set to 0, then the next
conversion is performed using the previously selected
converter conguration.
The second set of conguration data can be loaded into
the device by setting EN2 = 1 (see Table 4). The rst bit
(IM) is used to select the internal temperature sensor. If
IM = 1, the following conversion will be performed on
the internal temperature sensor rather than the selected
input channel. The next two bits (FA and FB) are used to
set the rejection frequency. The next bit (SPD) is used to
select either the 1x output rate if SPD = 0 (auto-calibration
is enabled and the offset is continuously calibrated and
removed from the nal conversion result) or the 2x output
rate if SPD = 1 (offset calibration disabled, multiplexing
output rates up to 15Hz with no latency). When IM = 1
(temperature measurement) SPD, GS2, GS1 and GS0 will
be ignored and the device will operate in 1x mode. The
nal 3 bits (GS2, GS1, GS0) are used to set the gain. The
conguration remains valid until a new input word with
EN = 1 (the rst three bits are 101) and EN2 = 1 is shifted
into the device.
Table 3 Channel Selection
MUX ADDRESS
CHANNEL SELECTION
SGL
ODD/
SIGN
A2A1A0
0
1
2
3
COM
*0
0
IN+
IN
00001
IN+
IN
01000
IN
IN+
01001
IN
IN+
10000
IN+
IN
10001
IN+
IN
11000
IN+
IN
11001
IN+
IN
*Default at power up
Table 2. LTC2486 Output Data Format
DIFFERENTIAL INPUT VOLTAGE
VIN*
BIT 23
EOC
BIT 22
DMY
BIT 21
SIG
BIT 20
MSB
BIT 19
BIT 18
BIT 17
BIT 4
BITS 3 TO 0
VIN* ≥ FS**
0011000
0
0000
FS** – 1LSB
0010111
1
0000
0.5 FS**
0010100
0
0000
0.5 FS** – 1LSB
0010011
1
0000
0
1/0***
0
0
0000
–1LSB
0001111
1
0000
–0.5 FS**
0001100
0
0000
–0.5 FS** – 1LSB
0001011
1
0000
–FS**
0001000
0
0000
VIN* < –FS**
0000111
1
0000
*The differential input voltage VIN = IN+ – IN. **The full-scale voltage FS = 0.5 VREF/Gain.
***The sign bit changes state during the 0 output code when the device is operating in the 2x speed mode.
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