参数资料
型号: LTC2262CUJ-14#TRPBF
厂商: Linear Technology
文件页数: 8/28页
文件大小: 0K
描述: IC ADC 14BIT 150MSPS 40-QFN
标准包装: 2,000
位数: 14
采样率(每秒): 150M
数据接口: 并联
转换器数目: 1
功率耗散(最大): 171mW
电压电源: 单电源
工作温度: 0°C ~ 70°C
安装类型: 表面贴装
封装/外壳: 40-WFQFN 裸露焊盘
供应商设备封装: 40-QFN(6x6)
包装: 带卷 (TR)
输入数目和类型: 1 个差分
配用: DC890B-ND - BOARD USB DATA COLLECTION
LTC2262-14
16
226214fc
For more information www.linear.com/LTC2262-14
APPLICATIONS INFORMATION
25
200
0.1F
AIN+
AIN–
12pF
0.1F
VCM
LTC2262-14
226214 F07
+
ANALOG
INPUT
HIGH SPEED
DIFFERENTIAL
AMPLIFIER
0.1F
Figure 7. Front-End Circuit Using a High
Speed Differential Amplifier
Reference
The LTC2262-14 has an internal 1.25V voltage reference.
For a 2V input range using the internal reference, connect
SENSE to VDD. For a 1V input range using the internal
reference, connect SENSE to ground. For a 2V input range
withanexternalreference,applya1.25Vreferencevoltage
to SENSE (Figure 9.)
The input range can be adjusted by applying a voltage to
SENSE that is between 0.625V and 1.30V. The input range
will then be 1.6 VSENSE.
VREF
REFH
SENSE
TIE TO VDD FOR 2V RANGE;
TIE TO GND FOR 1V RANGE;
RANGE = 1.6 VSENSE FOR
0.65V < VSENSE < 1.300V
1.25V
REFL
0.1F
2.2F
INTERNAL ADC
HIGH REFERENCE
BUFFER
5
0.8x
DIFF AMP
INTERNAL ADC
LOW REFERENCE
1.25V BANDGAP
REFERENCE
0.625V
RANGE
DETECT
AND
CONTROL
1F
0.1F
LTC2262-14
226214 F08
Figure 8. Reference Circuit
SENSE
1.25V
EXTERNAL
REFERENCE
1F
VREF
226214 F09
LTC2262-14
Figure 9. Using an External 1.25V Reference
The VREF, REFH and REFL pins should be bypassed as
shown in Figure 8. The 0.1F capacitor between REFH and
REFL should be as close to the pins as possible (not on
the back side of the circuit board).
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