参数资料
型号: LTC1446LCS8#PBF
厂商: Linear Technology
文件页数: 11/12页
文件大小: 0K
描述: IC D/A CONV 12BIT R-R DUAL 8SOIC
标准包装: 100
设置时间: 14µs
位数: 12
数据接口: 串行
转换器数目: 2
电压电源: 单电源
功率耗散(最大): 1.95mW
工作温度: 0°C ~ 70°C
安装类型: 表面贴装
封装/外壳: 8-SOIC(0.154",3.90mm 宽)
供应商设备封装: 8-SOIC
包装: 管件
输出数目和类型: 2 电压,单极;2 电压,双极
采样率(每秒): *
产品目录页面: 1350 (CN2011-ZH PDF)
8
LTC1446/LTC1446L
Serial Interface
The data on the DIN input is loaded into the shift register
on the rising edge of the clock. Data is loaded as one 24-
bit word where the first 12 bits are for DAC A and the
second 12 are for DAC B. For each 12-bit segment the MSB
is loaded first. Data from the shift register is loaded into the
DAC register when CS/LD is pulled high. The clock is
disabled internally when CS/LD is high. Note: CLK must be
low before CS/LD is pulled low to avoid an extra internal
clock pulse.
The buffered output of the 24-bit shift register is available
on the DOUT pin which swings from GND to VCC.
Multiple LTC1446/LTC1446L’s may be daisy-chained to-
gether by connecting the DOUT pin to the DIN pin of the next
chip, while the clock and CS/LD signals remain common
to all chips in the daisy chain. The serial data is clocked to
all of the chips, then the CS/LD signal is pulled high to
update all of them simultaneously.
OPERATIO
U
Voltage Output
The LTC1446/LTC1446L include an internal voltage refer-
ence which is connected to each DAC. The LTC1446 has a
full scale of 4.095V making 1LSB equal to 1mV. The
LTC1446L has a full scale of 2.5V making 1LSB equal to
0.61mV.
The LTC1446/LTC1446L rail-to-rail buffered outputs can
source or sink 5mA when operating with a 5V supply while
pulling to within 300mV of the positive supply voltage or
ground. The outputs swing to within a few millivolts of
either supply rail when unloaded and have an equivalent
output resistance of 40
when driving a load to the rails.
The buffer amplifiers can drive 1000pF without going into
oscillation. The output noise spectral density is
600nV/
√Hz at 1kHz.
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