MAX038CCP

更新时间： 2024-02-20 05:43:28

品牌	Logo	应用领域
美信 - MAXIM		/
页数	文件大小	规格书
8页	106K
描述
Evaluation Kit

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技术参数
数据手册

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MAX038CCP 技术参数

是否Rohs认证：	不符合	生命周期：	Obsolete
零件包装代码：	SOIC	包装说明：	SOP,
针数：	20	Reach Compliance Code：	compliant
ECCN代码：	EAR99	HTS代码：	8542.39.00.01
风险等级：	5.89	其他特性：	ALSO REQUIRES -5V SUPPLY
模拟集成电路 - 其他类型：	SQUARE; TRIANGULAR; SINE; SAWTOOTH; PULSE	JESD-30 代码：	R-PDSO-G20
JESD-609代码：	e0	长度：	12.8 mm
湿度敏感等级：	1	功能数量：	1
端子数量：	20	最高工作温度：	85 °C
最低工作温度：	-40 °C	最大输出频率：	20 GHz
封装主体材料：	PLASTIC/EPOXY	封装代码：	SOP
封装形状：	RECTANGULAR	封装形式：	SMALL OUTLINE
峰值回流温度（摄氏度）：	240	认证状态：	Not Qualified
座面最大高度：	2.65 mm	最大供电电压 (Vsup)：	5.25 V
最小供电电压 (Vsup)：	4.75 V	标称供电电压 (Vsup)：	5 V
表面贴装：	YES	温度等级：	INDUSTRIAL
端子面层：	TIN LEAD	端子形式：	GULL WING
端子节距：	1.27 mm	端子位置：	DUAL
处于峰值回流温度下的最长时间：	NOT SPECIFIED	宽度：	7.5 mm
Base Number Matches：	1

MAX038CCP 数据手册

MAX0 3 8 Eva lu a t io n Kit

Evluates:MAX038

Ou t p u t Bu ffe r

The MAX038 output amplitude is fixed at 2V . The

p-p

Ex t e n d in g t h e Ou t p u t

Fre q u e n c y Ra n g e

MAX038 output is capable of driving a capacitive load

up to 90pF. The MAX442 amplifier buffers the MAX038

output to a 50Ω coaxial cable. The MAX442 is set at a

gain of 2V/V, so that the output amplitude remains 1V/V

after the 50Ω back termination. The EV kit’s OUT pad

provides access to the output of the MAX038 prior to

the MAX442 buffer stage. The MAX442 output connects

to the BNC connector through a 50Ω resistor to back

terminate a 50Ω coaxial cable. When a terminated 50Ω

cable is connected, this resistor forms a voltage divider

with the load impedance, which attenuates the signal

b y one -ha lf. The MAX442 is op e ra te d with a 2V/V

c los e d -loop g a in to p rovid e unity g a in a t the 50Ω

cable’s output.

The components supplied with the EV kit allow an out-

put frequency range of 325kHz to 10MHz. The frequen-

cy range is controlled primarily by the oscillator capaci-

tor (C1) and the input current, which is a function of the

reference voltage and potentiometer R3. The resulting

frequency range can be shifted up or down depending

on the value of C1. Refer to the Output Frequency vs.

Inp ut Curre nt g ra p h whic h a p p e a rs in the Typ ic a l

Operating Characteristics of the MAX038 data sheet.

The upper end of the range can be extended by reduc-

ing C1. The lower end of the range can be reduced by

increasing the value of C1. Take care when selecting

alternate capacitors if stable operation over tempera -

ture is desired. Ceramic capacitors with low tempera-

ture c oe ffic ie nts give the b e st re sults. Re fe r to the

Se le c ting Re s is tors a nd Ca p a c itors s e c tion of the

MAX038 data sheet for further details.

The MAX442 is actually a 2-channel amplifier. A built-

in multiplexer allows either of two input signals to be

selected. TTL-level address pin A0 selects either IN0

or IN1. The MAX038 output is connected to MAX442

input IN0. IN1 is unused and connected to ground; it

may be used by cutting the JU7 trace, thus discon-

ne c ting IN1 from g round . Like wis e , the MAX442

address pin A0 can be disconnected from ground by

cutting the JU8 trace. Pull up A0 to +5V to select IN1.

See the MAX442 data sheet for additional operation

details.

S yn c Ou t p u t

a n d P h a s e -De t e c t o r In p u t

Refer to the SYNC Output and Phase Detector sections

of the MAX038 data sheet for details of circuit synchro-

nization. Access to the Phase Detector Input (PDI) and

SYNC is provided at pads PDI and SYNC.

High-speed transient currents in DGND and DV+ can

cause a switching spike in the output waveform at the

zero-crossing point. A lowpass output filter, as shown in

Figure 3 of the MAX038 data sheet, may be used to

greatly reduce the spike. Complete LC filter assemblies

(S3LP s e rie s ) a re a va ila b le from Coilc ra ft (p hone :

708-639-6400). If the SYNC output is not required, dis-

abling the SYNC circuit will eliminate the switching

spike. Cut the trace between the DV+ and +5V pads to

disable the SYNC output.

Re fe re n c e Vo lt a g e

The MAX038 includes a 2.5V bandgap reference capa-

ble of sourcing 4mA and sinking 100µA. Access to the

reference voltage is provided at the REF pad. The ref-

erence voltage is primarily used to provide stable cur-

rent to IIN and to bias DADJ and FADJ.

_______________________________________________________________________________________

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