參數(shù)資料
型號: MK3721S
廠商: IDT, Integrated Device Technology Inc
文件頁數(shù): 1/7頁
文件大?。?/td> 0K
描述: IC VCXO DTV/SET-TOP 8-SOIC
標(biāo)準(zhǔn)包裝: 97
類型: 壓控晶體振蕩器(VCXO)
PLL:
輸入: 晶體
輸出: CMOS
電路數(shù): 1
比率 - 輸入:輸出: 2:1
差分 - 輸入:輸出: 無/無
頻率 - 最大: 28MHz
除法器/乘法器: 無/無
電源電壓: 3.15 V ~ 3.45 V
工作溫度: 0°C ~ 70°C
安裝類型: 表面貼裝
封裝/外殼: 8-SOIC(0.154",3.90mm 寬)
供應(yīng)商設(shè)備封裝: 8-SOIC
包裝: 管件
DATASHEET
LOW COST 16.2 TO 28 MHZ 3.3 VOLT VCXO
MK3721
IDT / ICS LOW COST 16.2 TO 28 MHZ 3.3 VOLT VCXO
1
MK3721
REV E 103003
Description
The MK3721 series of devices includes the original
MK3721S and the new MK3721D. The MK3721D is a
drop-in replacement for the MK3721S device. Compared to
the earlier device, the MK3721D offers a wider operating
frequency range and improved power supply noise
rejection.
The MK3721 is a low cost, low-jitter, high-performance 3.3
volt VCXO designed to replace expensive discrete VCXOs
modules. The on-chip Voltage Controlled Crystal Oscillator
accepts a 0 to 3.3 V input voltage to cause the output
clocks to vary by ±100 ppm. Using ICS’ patented VCXO
techniques, the device uses an inexpensive external
pullable crystal in the range of 16.2 to 28 MHz to produce a
VCXO output clock at that same frequency.
ICS manufactures the largest variety of Set-Top Box and
multimedia clock synthesizers for all applications. If more
clock outputs are needed, see the MK3732 or MK377x
family of parts. Consult ICS to eliminate VCXOs, crystals,
and oscillators from your board.
The frequency of the on-chip VCXO is adjusted by an
external control voltage input into pin VIN. Because VIN is a
high-impedance input, it can be driven directly from an
PWM RC integrator circuit. Frequency output increases
with VIN voltage input. The usable range of VIN is 0 to 3.3
V.
Features
MK3721D is a drop-in replacement for the earlier
MK3721S device
Packaged in 8-pin SOIC
Operational frequency range of 16.2 MHz to 28 MHz
Uses an inexpensive external crystal
On-chip patented VCXO with pull range of 200 ppm
(minimum)
VCXO tuning voltage of 0 to 3.3 V
Operating voltage of 3.3 V
12 mA output drive capability at TTL levels
Advanced, low-power, sub-micron CMOS process
For frequencies between 1 MHz and 8 MHz, use the
MK3713D. For higher than 28 MHz, use the MK3732-05.
Available in a lead-free package
MK3721D is recommended for new designs.
Block Diagram
X1
X2
Voltage
Controlled
Crystal
Oscillator
VIN
16.2 to 28 MHz
Pullable
Crystal
16.2 to 28 MHz Clock
(REFOUT)
GND
VDD
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