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5962-0150601HXA 参数 Datasheet PDF下载

5962-0150601HXA图片预览
型号: 5962-0150601HXA
PDF下载: 下载PDF文件 查看货源
内容描述: 双通道, 14位, 65 MSPS A / D转换器的模拟输入信号调理 [Dual Channel, 14-Bit, 65 MSPS A/D Converter with Analog Input Signal Conditioning]
分类和应用: 转换器
文件页数/大小: 20 页 / 1431 K
品牌: ADI [ ADI ]
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AD13465  
AMP-IN-X-1  
AMP-IN-X-2  
THEORY OF OPERATION  
100  
100⍀  
The AD13465 is a high-dynamic range, 14-bit, 65 MHz pipe-  
line delay (three pipelines) analog-to-digital converter. The  
custom analog input section provides input ranges of 1 V p-p and  
2 V p-p, and input impedance configurations of 50 , 100 ,  
and 200 .  
TO AD8037  
Figure 2. Single-Ended Input Stage  
The AD13465 employs four monolithic ADI components per  
channel (AD8037, AD8138, AD8031, and AD6644), along  
with multiple passive resistor networks and decoupling capacitors  
to fully integrate a complete 14-bit analog-to-digital converter.  
LOADS  
AV  
AV  
CC  
CC  
AV  
AV  
CC  
CC  
10k  
10k⍀  
10k⍀  
In the single-ended input configuration, the input signal is  
passed through a precision laser trimmed resistor divider allowing  
the user to externally select operation with a full-scale signal of  
0.5 V or 1.0 V by choosing the proper input terminal for the  
application. The result of the resistor divider is to apply a full-scale  
input approximately 0.4 V to the noninverting input of the  
internal AD8037 amplifier.  
ENCODE  
ENCODE  
10k⍀  
LOADS  
Figure 3. ENCODE Inputs  
The AD13465 analog input includes an AD8037 amplifier  
featuring an innovative architecture that maximizes the dynamic  
range capability on the amplifier’s inputs and outputs. The  
AD8037 amplifier provides a high-input impedance and gain for  
driving the AD8138 in a single-ended-to-differential amplifier  
configuration. The AD8138 has a –3 dB bandwidth at 300 MHz  
and delivers a differential signal with the lowest harmonic  
distortion available in a differential amplifier. The AD8138  
differential outputs help balance the differential inputs to the  
AD6644 maximizing the performance of the device.  
DV  
CC  
CURRENT MIRROR  
DV  
CC  
V
REF  
The AD8031 provides the buffer for the internal reference  
analog-to-digital converter. The internal reference voltage of the  
AD6644 is designed to track the offsets and drifts and is used to  
ensure matching over an extended temperature range of opera-  
tion. The reference voltage is connected to the output common  
mode input on the AD8138. This reference voltage sets the  
output common mode on the AD8138 at 2.4 V, which is the  
midsupply level for the ADC.  
DR OUT  
CURRENT MIRROR  
The AD6644 has complementary analog input pins, AIN and  
AIN. Each analog input is centered at 2.4 V and should swing  
0.55 V around this reference. Since AIN and AIN are 180  
degrees out of phase, the differential analog input signal is 2.2 V  
peak-to-peak. Both analog inputs are buffered prior to the first  
track-and-hold.  
Figure 4. Digital Output Stage  
DV  
CC  
The AD6644 digital outputs drive 100 series resistors (Figure  
5.) The result is a 14-bit parallel digital CMOS-compatible  
word, coded as two’s complement.  
CURRENT MIRROR  
USING THE SINGLE-ENDED INPUT  
DV  
CC  
The AD13465 has been designed with the user’s ease of opera-  
tion in mind. Multiple input configurations have been included  
on board to allow the user a choice of input signal levels and  
input impedance. The standard inputs are 0.5 V and 1.0 V.  
The user can select the input impedance of the AD13465 on  
any input by using the other inputs as alternate locations for the  
GND. The following chart summarizes the impedance options  
available at each input location.  
V
REF  
100  
D0D13  
AMP-IN-X-1 = 100 when AMP-IN-X-2 is open.  
AMP-IN-X-1 = 50 when AMP-IN-X-2 is shorted to GND.  
AMP-IN-X-2 = 200 when AMP-IN-X-1 is open.  
CURRENT MIRROR  
Each channel has two analog inputs AMP-IN-A-1 and AMP-  
IN-A-2 or AMP-IN-B-1 and AMP-IN-B-2. Use AMP-IN-A-1  
Figure 5. Digital Output Stage  
REV. 0  
–9–