参数资料
型号: ADS62P45IRGCT
厂商: Texas Instruments
文件页数: 44/78页
文件大小: 0K
描述: IC ADC 14BIT DUAL 125MSPS 64VQFN
产品培训模块: Data Converter Basics
标准包装: 1
位数: 14
采样率(每秒): 125M
数据接口: 串行,并联
转换器数目: 2
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-VFQFN 裸露焊盘
供应商设备封装: 64-VQFN 裸露焊盘(9x9)
包装: 标准包装
输入数目和类型: 2 个差分,单极
其它名称: 296-23138-6
f Frequency MHz
0
1
2
3
4
5
6
7
8
9
0
100
200
300
400
500
600
C
Capacitance
pF
G082
S0163-03
INP
INM
VCM
1:1
ADS62P4x
25 W
0.1 F
m
0.1 F
m
SLAS561C
– JULY 2007 – REVISED FEBRUARY 2012
Figure 85. ADC Analog Input Capacitance (Cin) Across Frequency
Using RF-Transformer Based Drive Circuits
Figure 86 shows a configuration using a single 1:1 turns ratio transformer (for example, Coilcraft WBC1-1) that
can be used for low input frequencies (about 100 MHz). The single-ended signal is fed to the primary winding of
the RF transformer. The transformer is terminated on the secondary side. Putting the termination on the
secondary side helps to shield the kickbacks caused by the sampling circuit from the RF transformer
’s leakage
inductances. The termination is accomplished by two resistors connected in series, with the center point
connected to the 1.5-V common mode (VCM). The value of the termination resistors (connected to common
mode) has to be low (
<100 ) to provide a low-impedance path for the ADC common-mode switching currents.
Figure 86. Drive Circuit at Low Input Frequencies
At high input frequencies, the mismatch in the transformer parasitic capacitance (between the windings) results
in degraded even-order harmonic performance. Connecting two identical RF transformers back-to-back helps
minimize this mismatch, and good performance is obtained for high frequency input signals. Figure 87 shows an
example using two transformers (Coilcraft WBC1-1). An additional termination resistor pair (enclosed within the
shaded box) may be required between the two transformers to improve the balance between the P and M sides.
The center point of this termination must be connected to ground.
Copyright
2007–2012, Texas Instruments Incorporated
49
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