參數(shù)資料
型號(hào)： ADA4937-1YCPZ-R2
廠商： ANALOG DEVICES INC
元件分類： 通用總線功能
英文描述： Ultralow Distortion, Differential ADC Driver
中文描述： LINE DRIVER, QCC16
封裝： 3 X 3 MM, ROHS COMPLIANT, MO-220VEED-2, LFCSP-16
文件頁(yè)數(shù)： 22/28頁(yè)
文件大小： 448K
代理商： ADA4937-1YCPZ-R2
ADA4937-1
HIGH PERFORMANCE ADC DRIVING
The ADA4937-1 is ideally suited for broadband IF applications.
The circuit in Figure 51 shows a front-end connection for an
ADA4937-1 driving an
AD9445
, 14-bit, 105 MSPS ADC. The
AD9445
achieves its optimum performance when driven
differentially. The ADA4937-1 eliminates the need for a
transformer to drive the ADC and performs a single-ended-
to-differential conversion and buffering of the driving signal.
The ADA4937-1 is configured with a single 5 V supply and
unity gain for a single-ended input to differential output. The
61.9 Ω termination resistor, in parallel with the single-ended
input impedance of 267 Ω, provides a 50 Ω termination for the
source. The additional 26 Ω (226 Ω total) at the inverting input
balances the parallel impedance of the 50 Ω source and the
termination resistor driving the noninverting input.
Rev. 0 | Page 22 of 28
The signal generator has a symmetric, ground-referenced
bipolar output. The V
OCM
pin of the ADA4937-1 is left floating,
allowing the internal divider to set the output common-mode
voltage at midsupply. One-half of the common-mode voltage is fed
back to the summing nodes, biasing –IN and + IN at 1.25 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 of the amplifier is ac-coupled to the ADC through a
second-order, low-pass filter with a cutoff frequency of 100 MHz.
This reduces the noise bandwidth of the amplifier and isolates
the driver outputs from the ADC inputs.
The
AD9445
is configured for a 2 V p-p full-scale input by
connecting the SENSE pin to AGND, as shown in Figure 51.
0
VIN–
VIN+
47pF
30nH
30nH
24.3
24.3
50
SIGNAL
GENERATOR
226
200
V
OCM
5V
ADA4937-1
+
61.9
200
200
14
BUFFER
T/H
ADC
CLOCK/
TIMING
REF
SENSE
AGND
0.1μF
0.1μF
AD9445
3.3V (A)
AVDD1
5V (A)
AVDD2
3.3V (D)
DRVDD
Figure 51. ADA4937-1 Driving an AD9445, 14-Bit, 105 MSPS ADC
相關(guān)PDF資料
PDF描述
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
ADA4938-1ACPZ-R7 Ultra-Low Distortion Differential ADC Driver
相關(guān)代理商/技術(shù)參數(shù)
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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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ADA4937-2YCPZ-R2 制造商:Analog Devices 功能描述:SP AMP DIFF AMP DUAL 5.25V 24LFCSP EP - Tape and Reel 制造商:Analog Devices 功能描述:IC DIFF AMP 1.9GHZ 6000V/ LFCSP-24 制造商:Analog Devices 功能描述:IC, DIFF AMP, 1.9GHZ, 6000V/ uS, LFCSP-24, No. of Amplifiers:2, Input Offset Vol
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