参数资料
型号: LTC2158IUP-14#TRPBF
厂商: Linear Technology
文件页数: 6/28页
文件大小: 0K
描述: IC ADC DUAL 14BIT 310M 64-QFN
标准包装: 2,000
位数: 14
采样率(每秒): 310M
数据接口: 并联,串行,SPI
转换器数目: 2
功率耗散(最大): 873mW
电压电源: 模拟和数字
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 64-WFQFN 裸露焊盘
供应商设备封装: 64-QFN(9x9)
包装: 带卷 (TR)
输入数目和类型: 2 个差分
配用: DC1371A-ND - BOARD USB DATA ACQUISITION HS
LTC2158-14
14
215814f
applicaTions inForMaTion
Figure 5. Recommended Front-End Circuit for
Input Frequencies from 150MHz to 900MHz
Figure 6. Front-End Circuit Using a High
Speed Differential Amplifier
Amplifier Circuits
Figure 6 shows the analog input being driven by a high
speed differential amplifier. The output of the amplifier is
AC coupled to the A/D so the amplifier’s output common
mode voltage can be optimally set to minimize distortion.
At very high frequencies an RF gain block will often have
lower distortion than a differential amplifier. If the gain
block is single-ended, then a transformer circuit (Figures
3 and 5) should convert the signal to differential before
driving the A/D. The A/D cannot be driven single-ended.
Reference
The LTC2158-14 has an internal 1.25V voltage reference.
For a 1.32V input range with internal reference, connect
SENSE to VDD. For a 1.32V input range with an external
reference, apply a 1.25V reference voltage to SENSE
(Figure 7).
Encode Input
The signal quality of the encode inputs strongly affects
the A/D noise performance. The encode inputs should
be treated as analog signals—do not route them next to
digital traces on the circuit board.
The encode inputs are internally biased to 1.2V through
10k equivalent resistance (Figure 8). If the common mode
of the driver is within 1.1V to 1.5V, it is possible to drive
the encode inputs directly. Otherwise a transformer or
coupling capacitors are needed (Figures 9 and 10). The
maximum (peak) voltage of the input signal should never
exceed VDD +0.1V or go below –0.1V.
4.7
50
0.1F
AIN+
AIN–
0.1F
3pF
VCM
LTC2158-14
215814 F06
INPUT
0.1F
45
10
100
4.7
0.1F
IN
0.1F
T1: MABA
007159-000000
215814 F05
LTC2158-14
AIN+
AIN–
VCM
Figure 7. Reference Circuit
Figure 8. Equivalent Encode Input Circuit
VDD
LTC2158-14
215814 F08
1.2V
10k
ENC+
ENC
SCALER/
BUFFER
VREF
2.2F
SENSE
1.25V
LTC2158-14
215814 F07
5
ADC
REFERENCE
SENSE
DETECTOR
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