LTC2412
典型PERFOR一个CE特征
噪声直方图（输出率=
7.5Hz ，V
CC
= 5V, V
REF
= 2.5V)
12
10
8
6
4
2
0
–1.6
万CONSECUTIVE
读
V
CC
= 5V
V
REF
= 2.5V
V
IN
= 0V
REF
+
= 2.5V
REF
–
= GND
IN
+
= 1.25V
IN
–
= 1.25V
F
O
= GND
T
A
= 25°C
高斯
分配
M = 0.033ppm
σ
= 0.293ppm
12
10
8
6
4
2
0
–1.6 –1.2 –0.8 –0.4 0 0.4 0.8 1.2
输出代码（ ppm的V型
REF
)
读数的数目（％ ）
读数的数目（％ ）
读数的数目（％ ）
–0.8
0
0.8
输出代码（ ppm的V型
REF
)
噪声直方图（输出率=
7.5Hz ，V
CC
= 2.7V, V
REF
= 2.5V)
12
10
8
6
4
2
0
–1.6 –1.2 –0.8 –0.4 0 0.4 0.8 1.2
输出代码（ ppm的V型
REF
)
万CONSECUTIVE
读
V
CC
= 2.7V
V
REF
= 2.5V
V
IN
= 0V
REF
+
= 2.5V
REF
–
= GND
IN
+
= 1.25V
IN
–
= 1.25V
F
O
= GND
T
A
= 25°C
高斯
分配
M = 0.079ppm
σ
= 0.298ppm
12
10
8
6
4
2
读数的数目（％ ）
读数的数目（％ ）
读数的数目（％ ）
长期噪声直方图
（时间= 60小时，V
CC
= 5V,
V
REF
= 5V)
12
10
8
6
4
2
高斯分布
M = 0.101837ppm
σ
= 0.154515ppm
ADC CONSECUTIVE
读
V
CC
= 5V
V
REF
= 5V
V
IN
= 0V
REF
+
= 5V
REF
–
= GND
IN
+
= 2.5V
IN
–
= 2.5V
F
O
= GND
T
A
= 25°C
0.8
1.0
0.8
ADC读数（ ppm的V型
REF
)
读数的数目（％ ）
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
–1.0
0
V
CC
= 5V牛逼
A
= 25°C
IN
+
= 2.5V
+
V
REF
= 5V REF = 5V IN
–
= 2.5V
V
IN
= 0V REF
–
= GND
F
O
= GND
5 10 15 20 25 30 35 40 45 50 55 60
时间（小时）
2412 G17
RMS噪声（ ppm的V型
REF
)
0
–0.8 –0.6 –0.4 –0.2 0 0.2 0.4 0.6
输出代码（ ppm的V型
REF
)
ü W
1.6
2412 G10
噪声直方图（输出率=
22.5Hz ，V
CC
= 5V, V
REF
= 2.5V)
万CONSECUTIVE
读
V
CC
= 5V
V
REF
= 2.5V
V
IN
= 0V
REF
+
= 2.5V
REF
–
= GND
IN
+
= 1.25V
IN
–
= 1.25V
F
O
= 460800Hz
T
A
= 25°C
高斯
分配
M = 0.014ppm
σ
= 0.292ppm
12
10
8
6
4
2
噪声直方图（输出率=
52.5Hz ，V
CC
= 5V, V
REF
= 2.5V)
万CONSECUTIVE
读
V
CC
= 5V
V
REF
= 2.5V
V
IN
= 0V
REF
+
= 2.5V
REF
–
= GND
IN
+
= 1.25V
IN
–
= 1.25V
F
O
= 1075200Hz
T
A
= 25°C
高斯
分配
M = 3.852ppm
σ
= 0.326ppm
1.6
0
–5.5 –5.1 –4.7 –4.3 –3.9 –3.5 –3.1 –2.7 –2.3
输出代码（ ppm的V型
REF
)
2412 G12
2410 G11
噪声直方图（输出率=
22.5Hz ，V
CC
= 2.7V, V
REF
= 2.5V)
万CONSECUTIVE
读
V
CC
= 2.7V
V
REF
= 2.5V
V
IN
= 0V
REF
+
= 2.5V
REF
–
= GND
IN
+
= 1.25V
IN
–
= 1.25V
F
O
= 460800Hz
T
A
= 25°C
高斯
分配
M = 0.177ppm
σ
= 0.297ppm
10
噪声直方图（输出率=
52.5Hz ，V
CC
= 2.7V, V
REF
= 2.5V)
万CONSECUTIVE
9读物
V = 2.7V
8 V
CC
= 2.5V
REF
7 V
IN
= 0V
REF
+
= 2.5V
6 REF
–
= GND
IN
+
= 1.25V
5
IN
–
= 1.25V
4 F
O
= 1075200Hz
T
A
= 25°C
3
2
1
高斯
分配
M = 3.714ppm
σ
= 1.295ppm
1.6
0
–1.6 –1.2 –0.8 –0.4 0 0.4 0.8 1.2
输出代码（ ppm的V型
REF
)
1.6
0
–10 –8.5 –7 –5.5 –4 –2.5 –1 0.5
输出代码（ ppm的V型
REF
)
2
2412 G13
2412 G14
2412 G15
连续的ADC读数
对时间
0.5
RMS噪声
与输入差分电压
V
CC
= 5V
V
REF
= 5V
REF
+
= 5V
REF
–
= GND
V
INCM
= 2.5V
F
O
= GND
T
A
= 25°C
0.6
0.4
0.3
0.2
0.1
0
–2.5 –2 –1.5 –1 –0.5 0 0.5 1 1.5 2
输入差分电压（V）的
2.5
2412 G16
2412 G18
2412f
7
