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參數(shù)資料
| 型號： | MAX038CCP |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Evaluation Kit |
| 中文描述： | 評估板 |
| 文件頁數(shù)： | 2/8頁 |
| 文件大?。?/td> | 106K |
| 代理商： | MAX038CCP |
J U3 to allow the frequency to be adjusted. Verify
that there is a shunt on J U5.
4) Verify the shunts on J U1 and J U2 for a square-wave
output. Refer to Table 1 for alternate waveform
selections.
5) Apply power and verify the output waveform.
_______________Detailed Desc ription
Waveform S elec tion
To select the desired output waveform, place shunts
across J U1 and J U2 in the combinations shown in
Table 1. These jumpers set address pins A0 and A1 to
TTL/CMOS-logic levels. External control may be initiat-
ed by connecting an external source to the A0 and
A1 pads and removing the shunts on J U1 and J U2.
Note that there are 10k
pull-up resistors to +5V on the
A0 and A1 address lines.
Table 1. Waveform Jumper Select
*Note: Frequency pre-set by oscillator capacitor (C1) and input
current (position of R3) as specified by formula [1].
Output Frequenc y
The output frequency is controlled by the oscillator
capacitor (C1), the current injected into the IIN pin, and
the voltage on the FADJ pin. The EV kit allows indepen-
dent adjustment of both input current (R3) and FADJ
voltage (R2). Refer to the
Detailed Description section
of the MAX038 data sheet for additional theory of oper-
ation.
Input Current Control
The current injected into the IIN pin acts as the primary
frequency-adjustment control. The R3 potentiometer
varies the current to the MAX038’s IIN pin. The input
current can be easily monitored by removing the J U5
shunt and placing a current meter across the J U5 pins.
The components supplied on the EV kit will allow an
input current range of 50μA to 725μA. With the VADJ
pin grounded, the fundamental output frequency (F
o
) is
as follows:
F
o
(MHz) = I
IN
(μA)
÷
C
OSC
(pF) [1]
where: I
IN
= current injected into IIN
= V
REF
÷
(R3 + R12)
= 2.5V
÷
(0k
to 50k
+ 3.3k
)
C
OSC
= external oscillator capacitor (C1)
To use an external input current, connect the external
current source to the IIN pad and remove the J U5 shunt
completely. Note that there is a 3.3k
resistor in series
with the device IIN pin.
FADJ Control
Varying the FADJ voltage will also vary the output fre-
quency. With a shunt across pins 1 and 2 of J U3, the
R2 potentiometer will vary the voltage applied to the
FADJ pin. With the J U3 shunt on pins 2 and 3, the FADJ
pin is grounded. Grounding the FADJ pin sets the out-
put to the fundamental output frequency (F
o
), as
given by equation [1].
To use an external FADJ voltage, connect the external
source to the FADJ pad and remove the J U3 shunt
completely. Limit the external FADJ voltage to ±2.4V.
Duty-Cyc le Control
The voltage on the DADJ pin controls the duty cycle of
the output waveform. With the J U4 shunt on pins 1 and 2,
the R1 potentiometer will vary the voltage applied to the
DADJ pin, thus varying the duty cycle 15% to 85%. With
the J U4 shunt on pins 2 and 3, the DADJ pin is grounded.
Grounding the DADJ pin fixes the duty cycle at 50%.
To use an external DADJ voltage, connect the external
voltage source to the DADJ pad and remove the J U4
shunt completely. Limit the external DADJ voltage to
±2.3V.
E
MAX 038 Evaluation K it
2
_______________________________________________________________________________________
Table 2. Frequency and Duty-Cycle Jumper Select
Fixed 50% Duty Cycle
2 & 3
J U4
Adjustable Duty Cycle
1 & 2
Pre-Set Frequency*
2 & 3
J U3
Adjustable Frequency
1 & 2
MAX038 OUTPUT
SHUNT
LOCATION
JUMPER
Square Wave
Short
Short
Triangle Wave
Short
Open
Sine Wave
Open
Don't Care
OUTPUT WAVEFORM
JU2
JU1
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| MAX038EPP | ER 7C 5#16 2#12 PIN PLUG |
| MAX038EWP | Circular Connector; Series:; Body Material:Aluminum Alloy; Connecting Termination:Solder; Connector Shell Size:18; Circular Contact Gender:Pin; Circular Shell Style:Straight Plug; Insert Arrangement:18-18; MIL SPEC:MIL-C-5015 RoHS Compliant: No |
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| MAX038CPP | 功能描述:IC GEN WAVEFORM HI-FREQ 20-DIP RoHS:否 類別:集成電路 (IC) >> 時鐘/計(jì)時 - 可編程計(jì)時器和振蕩器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:45 系列:- 類型:溫度 - 補(bǔ)償晶體振蕩器（TCXO） 計(jì)數(shù):- 頻率:25MHz 電源電壓:3.135 V ~ 3.465 V 電流 - 電源:1.5mA 工作溫度:-40°C ~ 85°C 封裝/外殼:16-SOIC（0.295"，7.50mm 寬） 包裝:管件 供應(yīng)商設(shè)備封裝:16-SOIC W 安裝類型:表面貼裝 |
| MAX038CPP+ | 功能描述:IC GEN WAVEFORM HI-FREQ 20-DIP RoHS:是 類別:集成電路 (IC) >> 時鐘/計(jì)時 - 可編程計(jì)時器和振蕩器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:45 系列:- 類型:溫度 - 補(bǔ)償晶體振蕩器（TCXO） 計(jì)數(shù):- 頻率:25MHz 電源電壓:3.135 V ~ 3.465 V 電流 - 電源:1.5mA 工作溫度:-40°C ~ 85°C 封裝/外殼:16-SOIC（0.295"，7.50mm 寬） 包裝:管件 供應(yīng)商設(shè)備封裝:16-SOIC W 安裝類型:表面貼裝 |
| MAX038CWP | 功能描述:IC GEN WAVEFORM HI-FREQ 20-SOIC RoHS:否 類別:集成電路 (IC) >> 時鐘/計(jì)時 - 可編程計(jì)時器和振蕩器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:45 系列:- 類型:溫度 - 補(bǔ)償晶體振蕩器（TCXO） 計(jì)數(shù):- 頻率:25MHz 電源電壓:3.135 V ~ 3.465 V 電流 - 電源:1.5mA 工作溫度:-40°C ~ 85°C 封裝/外殼:16-SOIC（0.295"，7.50mm 寬） 包裝:管件 供應(yīng)商設(shè)備封裝:16-SOIC W 安裝類型:表面貼裝 |
| MAX038CWP+ | 功能描述:時鐘發(fā)生器及支持產(chǎn)品 RoHS:否 制造商:Silicon Labs 類型:Clock Generators 最大輸入頻率:14.318 MHz 最大輸出頻率:166 MHz 輸出端數(shù)量:16 占空比 - 最大:55 % 工作電源電壓:3.3 V 工作電源電流:1 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-56 |
| MAX038CWP+T | 功能描述:時鐘發(fā)生器及支持產(chǎn)品 RoHS:否 制造商:Silicon Labs 類型:Clock Generators 最大輸入頻率:14.318 MHz 最大輸出頻率:166 MHz 輸出端數(shù)量:16 占空比 - 最大:55 % 工作電源電壓:3.3 V 工作電源電流:1 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-56 |
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