参数资料
型号: LTC1458LIG#TRPBF
厂商: Linear Technology
文件页数: 10/12页
文件大小: 0K
描述: IC D/A CONV 12BIT R-R QUAD28SSOP
标准包装: 2,000
设置时间: 14µs
位数: 12
数据接口: 串行
转换器数目: 4
电压电源: 单电源
功率耗散(最大): 2.4mW
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 28-SSOP(0.209",5.30mm 宽)
供应商设备封装: 28-SSOP
包装: 带卷 (TR)
输出数目和类型: 4 电压,单极
采样率(每秒): *
7
LTC1458/LTC1458L
B11 A
MSB
B11 C
MSB
B0 B
LSB
t1
t6
B0 D
LSB
B11 A
CURRENT WORD
t7
t2
t9
t4
t3
t8
CLK
DIN
DOUT
CS/LD
t5
1458 TD
B0 D
PREVIOUS WORD
B11 A
PREVIOUS WORD
B10 A
PREVIOUS WORD
B0 B
PREVIOUS WORD
B11 C
PREVIOUS WORD
B0 D
PREVIOUS WORD
Resolution (n): Resolution is defined as the number of
digital input bits, n. It defines the number of DAC output
states (2n) that divide the full-scale range. The resolution
does not imply linearity.
Full-Scale Voltage (VFS): This is the output of the DAC
when all bits are set to 1.
Voltage Offset Error (VOS): The theoretical voltage at the
output when the DAC is loaded with all zeros. The output
amplifier can have a true negative offset, but because the
part is operated from a single supply, the output cannot go
below zero. If the offset is negative, the output will remain
near 0V resulting in the transfer curve shown in Figure 1.
DAC CODE
1458 F01
OUTPUT
VOLTAGE
NEGATIVE
OFFSET
0V
Figure 1. Effect of Negative Offset
The offset of the part is measured at the code that corre-
sponds to the maximum offset specification:
VOS = VOUT – [(Code)(VFS)/(2n – 1)]
Least Significant Bit (LSB): One LSB is the ideal voltage
difference between two successive codes.
LSB = (VFS – VOS)/(2n – 1) = (VFS – VOS)/4095
Nominal LSBs:
LTC1458
LSB = 4.095V/4095 = 1mV
LTC1458L
LSB = 2.5V/4095 = 0.610mV
Integral Nonlinearity (INL): End-point INL is the maxi-
mum deviation from a straight line passing through the
end-points of the DAC transfer curve. Because the part
operates from a single supply and the output cannot go
below zero, the linearity is measured between full scale
and the code corresponding to the maximum offset
specification. The INL error at a given input code is
calculated as follows:
INL
= [VOUT – VOS – (VFS – VOS)(code/4095)]/LSB
VOUT = The output voltage of the DAC measured at
the given input code
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