参数资料
型号: LTC2499IUHF#PBF
厂商: Linear Technology
文件页数: 11/34页
文件大小: 0K
描述: IC ADC 24BIT DELTA SIG 38-QFN
标准包装: 52
位数: 24
采样率(每秒): 7.5
数据接口: I²C,串行
转换器数目: 1
功率耗散(最大): 480µW
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: 38-WFQFN 裸露焊盘
供应商设备封装: 38-QFN(5x7)
包装: 管件
输入数目和类型: 16 个单端,双极;8 个差分,双极
产品目录页面: 1348 (CN2011-ZH PDF)
配用: DC1012A-A-ND - BOARD DELTA SIGMA ADC LTC2499
LTC2499
2499fd
nels can be selected to form a differential input. For SGL
= 1, one of 16 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).
Once the first word is written into the device, a second
word may be input in order to select a configuration mode.
The first bit of the second word is the enable bit for the
conversion configuration (EN2). If this bit is set to 0, then
the next conversion is performed using the previously
selected converter configuration.
A new configuration can be loaded into the device by
setting EN2 = 1 (see Table 4). The first bit (IM) is used
to select the internal temperature sensor. If IM = 1, the
following conversion will be performed on the internal
temperaturesensorratherthantheselectedinputchannel.
The next two bits (FA and FB) are used to set the rejection
frequency. The final 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 final 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 will be ignored and the device will
operate in 1x mode.
The configuration remains valid until a new input word
with EN = 1 (the first three bits are 101 for the first word)
and EN2 = 1 (for the second write byte) is shifted into
the device.
Table 4. Converter Configuration
1
0
EN
SGL
ODD
A2
A1
A0
EN2
IM
FA
FB
SPD
CONVERTER CONFIGURATION
1
0
X
Keep Previous
1
0
1
X
0
X
Keep Previous
0
1
X
Keep Previous
1
0
1
X
1
0
External Input (See Table 3)
50Hz/60Hz Rejection, 1x
1
0
1
X
1
0
1
0
External Input (See Table 3)
50Hz Rejection, 1x
1
0
1
X
1
0
1
0
External Input (See Table 3)
60Hz Rejection, 1x
1
0
1
X
1
0
1
External Input (See Table 3)
50Hz/60Hz Rejection, 2x
1
0
1
X
1
0
1
External Input (See Table 3)
50Hz Rejection, 2x
1
0
1
X
1
0
1
0
1
External Input (See Table 3)
60Hz Rejection, 2x
1
0
1
X
1
0
X
Measure Temperature
50Hz/60Hz Rejection, 1x
1
0
1
X
1
0
1
X
Measure Temperature
50Hz Rejection, 1x
1
0
1
X
1
0
X
Measure Temperature
60Hz Rejection, 1x
1
0
1
X
1
X
1
X
Reserved, Do Not Use
applications inForMation
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