Datasheet > ADA4939-2YCPZ-R2

ADA4939-2YCPZ-R2

更新时间： 2024-02-08 07:54:42

品牌	Logo	应用领域
亚德诺 - ADI		驱动器
页数	文件大小	规格书
24页	518K
描述
Ultralow Distortion Differential ADC Driver

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技术参数
数据手册
替代型号

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ADA4939-2YCPZ-R2 技术参数

是否无铅：	含铅	是否Rohs认证：	符合
生命周期：	Obsolete	零件包装代码：	QFN
包装说明：	HVQCCN,	针数：	24
Reach Compliance Code：	compliant	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	风险等级：	5.4
差分输出：	YES	驱动器位数：	1
输入特性：	DIFFERENTIAL	接口集成电路类型：	LINE DRIVER
接口标准：	GENERAL PURPOSE	JESD-30 代码：	S-XQCC-N24
JESD-609代码：	e3	长度：	4 mm
湿度敏感等级：	3	功能数量：	2
端子数量：	24	最高工作温度：	105 °C
最低工作温度：	-40 °C	封装主体材料：	UNSPECIFIED
封装代码：	HVQCCN	封装形状：	SQUARE
封装形式：	CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE	峰值回流温度（摄氏度）：	260
认证状态：	Not Qualified	最大接收延迟：
座面最大高度：	1 mm	最大供电电压：	5.25 V
最小供电电压：	3 V	标称供电电压：	5 V
表面贴装：	YES	技术：	BIPOLAR
温度等级：	INDUSTRIAL	端子面层：	Matte Tin (Sn)
端子形式：	NO LEAD	端子节距：	0.5 mm
端子位置：	QUAD	处于峰值回流温度下的最长时间：	NOT SPECIFIED
宽度：	4 mm	Base Number Matches：	1

ADA4939-2YCPZ-R2 数据手册

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ADA4939-1/ADA4939-2

HIGH PERFORMANCE ADC DRIVING

The ADA4939 is ideally suited for broadband ac-coupled and

differential-to-differential applications on a single supply.

In this example, the signal generator has a 1 V p-p symmetric,

ground-referenced bipolar output when terminated in 50 Ω.

The V_OCMpin of the ADA4939 is bypassed for noise reduction

and left floating such that the internal divider sets the output

common-mode voltage nominally at midsupply. Because the

inputs are ac-coupled, no dc common-mode current flows in

the feedback loops, and a nominal dc level of midsupply is

present at the amplifier input terminals. Besides placing the

amplifier inputs at their optimum levels, the ac coupling technique

lightens the load on the amplifier and dissipates less power than

applications with dc-coupled inputs. With an output common-

mode voltage of nominally 2.5 V, each ADA4937 output swings

between 2.0 V and 3.0 V, providing a gain of 2 and a 2 V p-p

differential signal to the ADC input.

The circuit in Figure 54 shows a front-end connection for an

ADA4939 driving an AD9445, 14-bit, 105 MSPS ADC, with ac

coupling on the ADA4939 input and output. (The AD9445

achieves its optimum performance when driven differentially.)

The ADA4939 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 ADA4939 is configured with a single 5 V supply and gain

of 2 for a single-ended input to differential output. The 60.4 Ω

termination resistor, in parallel with the single-ended input

impedance of approximately 300 Ω, provides a 50 Ω termination

for the source. The additional 27.4 Ω (227.4 Ω total) at the

inverting input balances the parallel impedance of the 50 Ω

source and the termination resistor driving the noninverting input.

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 54.

5V (A) 3.3V (A) 3.3V (D)

412Ω

AVDD2 AVDD1 DRVDD

30nH

0.1µF

200Ω

50Ω

VIN–

47pF

VIN+

AD9445

BUFFER T/H

24.3Ω

60.4Ω

OCM

ADA4939

ADC

200Ω

SIGNAL

GENERATOR

30nH

0.1µF

CLOCK/

TIMING

REF

27.4Ω

412Ω

AGND

SENSE

Figure 54. ADA4939 Driving an AD9445 ADC with AC-Coupled Input and Output

Rev. 0 | Page 23 of 24

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ADA4939-2YCPZ-R2 替代型号

型号	品牌	替代类型	描述	数据表
ADA4939-2YCPZ-RL	ADI	完全替代	Ultralow Distortion Differential ADC Driver
ADA4939-2YCPZ-R7	ADI	完全替代	Ultralow Distortion Differential ADC Driver

与ADA4939-2YCPZ-R2相关器件

型号	品牌	获取价格	描述	数据表
ADA4939-2YCPZ-R7	ADI	获取价格	Ultralow Distortion Differential ADC Driver
ADA4939-2YCPZ-RL	ADI	获取价格	Ultralow Distortion Differential ADC Driver
ADA494	ADI	获取价格	16-Bit, 1 MSPS PulSAR ADC in MSOP QFN
ADA4940-1	ADI	获取价格	Ultralow Power, Low Distortion
ADA4940-1_16	ADI	获取价格	Ultralow Power, Low Distortion, Fully Differential ADC Drivers
ADA4940-1ACP-EBZ	ADI	获取价格	Ultralow Power, Low Distortion
ADA4940-1ACPZ	ADI	获取价格	OP-AMP, 350uV OFFSET-MAX, QCC16
ADA4940-1ACPZ-R2	ADI	获取价格	Ultralow Power, Low Distortion
ADA4940-1ACPZ-R7	ADI	获取价格	Ultralow Power, Low Distortion
ADA4940-1ACPZ-RL	ADI	获取价格	Ultralow Power, Low Distortion

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