參數(shù)資料
型號(hào)： ADA4937-1_07
廠商： Analog Devices, Inc.
英文描述： Ultralow Distortion, Differential ADC Driver
中文描述： 超低失真差分ADC驅(qū)動(dòng)器
文件頁數(shù)： 23/28頁
文件大?。?/td> 448K
代理商： ADA4937-1_07
ADA4937-1
The circuit in Figure 53 shows a simplified front-end connection
for an ADA4937-1 driving an
AD9246
, 14-bit, 125 MSPS ADC.
The
AD9246
achieves its optimum performance when driven
differentially. The ADA4937-1 performs the single-ended-to-
differential conversion, eliminating the need for a transformer
to drive the ADC.
The ADA4937-1 is configured with a single 5 V supply and a
gain of ~2 V/V for a single-ended input to differential output.
The 76.8 Ω termination resistor, in parallel with the single-
ended input impedance of 137 Ω, provides a 50 Ω ac termination
for the source. The additional 30 Ω (120 Ω total) at the inverting
input balances the parallel ac impedance of the 50 Ω source and
the termination resistor driving the noninverting input.
The signal generator has a symmetric, ground-referenced
bipolar output. The V
OCM
pin of the ADA4937-1 is left
unconnected; therefore, the internal pull-ups set the output
common-mode voltage to midsupply. A portion of this is fed
back to the summing nodes, biasing –IN and + IN at 0.55 V. For
a common-mode voltage of 2.5 V each ADA4937-1 output swings
between 2.0 V and 3.0 V providing a 2 V p-p differential output.
The output is ac-coupled to a single-pole, low-pass filter. This
reduces the noise bandwidth of the amplifier and provides some
level of isolation from the switched capacitor inputs of the ADC.
The
AD9246
is set for a 2 V p-p full-scale input by connecting
Rev. 0 | Page 23 of 28
the SENSE pin to AGND. The inputs of the
AD9246
are biased
at 1 V by connecting the CML output, as shown in Figure 53.
The circuit was tested with a 1 dBFS signal at various
frequencies. Figure 52 shows a plot of the second
and third
harmonic distortion (HD2/HD3) vs. frequency.
–75
–80
–85
–90
–95
–100
0
120
80
40
100
60
20
H
FREQUENCY (MHz)
0
HD2
HD3
G = +2
Figure 52. HD2/HD3 for Combination of ADA4937-1 and AD9246 ADC
0
1.8V
DRVDD
AVDD
VIN–
VIN+
AD9246
AGND
CML
SENSE
D11 TO
D0
10pF
10μF
10μF
10μF
33
33
200
200
50
V
IN
90
90
76.8
5V
ADA4937-1
+
200
200
50
76.8
10μF
Figure 53. ADA4937-1 Driving an AD9246, a 14-Bit, 125 MSPS ADC
相關(guān)PDF資料
PDF描述
ADA4937-1YCPZ-R2 Ultralow Distortion, Differential ADC Driver
ADA4937-1YCPZ-R7 Ultralow Distortion, Differential ADC Driver
ADA4937-1YCPZ-RL Ultralow Distortion, Differential ADC Driver
ADA4938-1_07 Ultra-Low Distortion Differential ADC Driver
ADA4938-1ACPZ-R2 Ultra-Low Distortion Differential ADC Driver
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ADA4937-1YCP-EBZ 功能描述:BOARD EVAL FOR ADA4937-1YCP RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評(píng)估板 - 運(yùn)算放大器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:-
ADA4937-1YCPZ-R2 制造商:Analog Devices 功能描述:SP Amp DIFF AMP Single 5.25V 16-Pin LFCSP EP T/R 制造商:Analog Devices 功能描述:SP AMP DIFF AMP SGL 5.25V 16LFCSP EP - Tape and Reel 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Analog Devices 功能描述:SP Amp DIFF AMP Single 5.25V 16-Pin LFCSP EP Tape & Reel 制造商:Analog Devices 功能描述:IC ADC DRIVERDIFF16LFCSP 制造商:Analog Devices 功能描述:OP Amp Differential ADC Driver LFCSP16
ADA4937-1YCPZ-R2 制造商:Analog Devices 功能描述:IC DIFF AMP 1.9GHZ 6000V/S LFCSP-16
ADA4937-1YCPZ-R7 功能描述:IC ADC DRIVER DIFF 16-LFCSP RoHS:是 類別:集成電路 (IC) >> 線性 - 放大器 - 專用 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:60 系列:- 類型:可變?cè)鲆娣糯笃?應(yīng)用:CATV 安裝類型:表面貼裝 封裝/外殼:20-WQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:20-TQFN-EP（5x5） 包裝:托盤
ADA4937-1YCPZ-RL 功能描述:IC ADC DIFF DRIVER 16-LFCSP RoHS:是 類別:集成電路 (IC) >> 線性 - 放大器 - 專用 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:60 系列:- 類型:可變?cè)鲆娣糯笃?應(yīng)用:CATV 安裝類型:表面貼裝 封裝/外殼:20-WQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:20-TQFN-EP（5x5） 包裝:托盤
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