AD5539S

更新时间： 2024-02-07 16:46:54

品牌	Logo	应用领域
亚德诺 - ADI		运算放大器
页数	文件大小	规格书
16页	475K
描述
Ultrahigh Frequency Operational Amplifier

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技术参数
数据手册

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AD5539S 技术参数

是否无铅：	含铅	是否Rohs认证：	不符合
生命周期：	Active	零件包装代码：	DIP
包装说明：	DIP,	针数：	14
Reach Compliance Code：	unknown	风险等级：	5.71
Is Samacsys：	N	商用集成电路类型：	VIDEO AMPLIFIER
JESD-30 代码：	R-GDIP-T14	JESD-609代码：	e0
长度：	19.43 mm	信道数量：	1
功能数量：	1	端子数量：	14
最高工作温度：	125 °C	最低工作温度：	-55 °C
封装主体材料：	CERAMIC, GLASS-SEALED	封装代码：	DIP
封装形状：	RECTANGULAR	封装形式：	IN-LINE
峰值回流温度（摄氏度）：	NOT SPECIFIED	认证状态：	COMMERCIAL
座面最大高度：	5.08 mm	最大供电电压 (Vsup)：	10 V
最小供电电压 (Vsup)：	4.5 V	表面贴装：	NO
温度等级：	MILITARY	端子面层：	TIN LEAD
端子形式：	THROUGH-HOLE	端子节距：	2.54 mm
端子位置：	DUAL	处于峰值回流温度下的最长时间：	NOT SPECIFIED
宽度：	7.62 mm	Base Number Matches：	1

AD5539S 数据手册

AD5539

AP P LYING TH E AD 5539

when operating at a noise gain of 7. Under these conditions, ex-

cess phase shift causes nearly 10 dB of peaking at 150 MHz.

T he AD5539 is stable for closed-loop gains of 4 or more as an

inverter and at (noise) gains of 5 or greater as a voltage follower.

T his means that whenever the AD5539 is operated at noise

gains below 5, external frequency compensation must be used to

insure stable operation.

Figure 15 illustrates the use of both lead and lag compensation

to permit stable low-gain operation. T he AD5539 is shown con-

nected as an inverting amplifier with the required external com-

ponents added to provide stability and improve high frequency

response. T he stray capacitance between the amplifier summing

junction and ground, C_X, represents whatever capacitance is as-

sociated with the particular type of op amp package used plus

the stray wiring capacitance at the summing junction.

T he following sections outline specific compensation circuits

which permit stable operation of the AD5539 down to follower

(noise) gains of 3 (inverting gains of 2) with corresponding

–3 dB bandwidths up to 390 MHz. External compensation is

achieved by modifying the frequency response to the AD5539’s

external feedback network (i.e., by adding lead-lag compensa-

tion) so that the amplifier operates at a noise gain of 5 (or more)

at frequencies over 44 MHz, independent of signal gain.

Evaluating the lead capacitance first (ignoring R_LAGand C_LAG

for now): the feedback network, consisting of R2 and C_LEAD, has

a pole frequency equal to:

F_A

(1)

(2)

2 π C

+ C_XR1|| R2

(

) (

)

LEAD

and a zero frequency equal to:

F_B=

2 π R1 × C

(

)

LEAD

Usually, frequency F_Ais made equal to F_B; that is, (R1C_X) =

(R2 C_LEAD), in a manner similar to the compensation used for

an attenuator or scope probe. However, if the pole frequency,

F_A, will lie above the unity gain crossover frequency (440 MHz),

then the optimum location of F_Bwill be near the crossover

Figure 13. Sm all Signal Open-Loop Gain and

Phase vs. Frequency

GENERAL P RINCIP LES O F LEAD AND LAG

CO MP ENSATIO N

T he AD5539 has its first pole or breakpoint in its open-loop fre-

quency response at about 10 MHz (see Figure 13). At frequen-

cies beyond 100 MHz, phase shift increases such that the output

lags the input by 180°—well before the unity gain crossover fre-

quency. T herefore, severe peaking (and possible oscillation) will

result if the AD5539 is operated at noise gains below 5, unless

external compensation is employed. Figure 14 shows the un-

compensated closed-loop frequency response of the AD5539

Figure 15. Inverting Am plifier Model Showing Both Lead

and Lag Com pensation

Figure 16. A Model of the Feedback Network of the

Inverting Am plifier

Figure 14. AD5539 Uncom pensated Response, Closed-

Loop Gain = 7

REV. B

–7–

1...4 5 678 9 10...16

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