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參數(shù)資料
| 型號(hào)： | ADA4937-2YCPZ-RL |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 17/29頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC DRIVER DUAL DIFF 24LFCSP |
| 標(biāo)準(zhǔn)包裝： | 5,000 |
| 類型： | ADC 驅(qū)動(dòng)器 |
| 應(yīng)用： | 數(shù)據(jù)采集 |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 24-VFQFN 裸露焊盤，CSP |
| 供應(yīng)商設(shè)備封裝： | 24-LFCSP-VQ（4x4） |
| 包裝： | 帶卷 (TR) |
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Data Sheet
ADA4937-1/ADA4937-2
Rev. D | Page 23 of 28
HIGH PERFORMANCE ADC DRIVING
The ADA4937-x is ideally suited for broadband IF applications.
The circuit in Figure 64 shows a front-end connection for an
AD9445 achieves its optimum performance when driven dif-
ferentially. The ADA4937-x 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-x 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 imped-
ance 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.
The signal generator has a symmetric, ground-referenced bipolar
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-x 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 64.
VIN–
VIN+
47pF
30nH
24.3
50
SIGNAL
GENERATOR
226
200
VOCM
5V
ADA4937-1
+
61.9
200
14
BUFFER T/H
ADC
CLOCK/
TIMING
REF
SENSE
AGND
0.1F
AD9445
3.3V (A)
AVDD1
5V (A)
AVDD2
3.3V (D)
DRVDD
06
59
1-
05
4
Figure 64. Driving an AD9445, 14-Bit, 105 MSPS ADC
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADA4938-1 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Ultra-Low Distortion Differential ADC Driver |
| ADA4938-1_06 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Ultra-Low Distortion Differential ADC Driver |
| ADA4938-1_07 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Ultra-Low Distortion Differential ADC Driver |
| ADA4938-1ACPZ-R2 | 制造商:Analog Devices 功能描述:SP Amp DIFF AMP Single ±5.5V/11V 16-Pin LFCSP EP T/R 制造商:Analog Devices 功能描述:SP AMP DIFF AMP SGL 5.5V/11V 16LFCSP EP - Tape and Reel 制造商:Analog Devices 功能描述:SP Amp DIFF AMP Single }5.5V/11V 16-Pin LFCSP EP Tape & Reel 制造商:Analog Devices 功能描述:IC AMP DIFFADCDR16BIT16LFCSP |
| ADA4938-1ACPZ-R2 | 制造商:Analog Devices 功能描述:IC DIFF AMP 1GHZ 4700V/S LFCSP-16 |
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