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参数资料
| 型号： | LTC6945IUFD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 27/28页 |
| 文件大小： | 0K |
| 描述： | IC SYNTHESIZER INTEGER N 28QFN |
| 软件下载： | PLLWizard™ PLLWizard™, with .NET 2.0 installer |
| 标准包装： | 2,500 |
| 类型： | * |
| PLL： | 是 |
| 输入： | 时钟 |
| 输出： | 时钟 |
| 电路数： | 1 |
| 比率 - 输入:输出： | 1:1 |
| 差分 - 输入:输出： | 是/是 |
| 频率 - 最大： | 6GHz |
| 除法器/乘法器： | 是/无 |
| 电源电压： | 3.15 V ~ 5.25 V |
| 工作温度： | -40°C ~ 105°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-WFQFN 裸露焊盘 |
| 供应商设备封装： | 28-QFN（4x5） |
| 包装： | 带卷 (TR) |
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LTC6945
8
6945f
VREFO+ (Pin 1): 3.15V to 3.45V Positive Supply Pin for
REFO Circuitry. This pin should be bypassed directly to
the ground plane using a 0.1μF ceramic capacitor as close
to the pin as possible.
REFO (Pin 2): Reference Frequency Output. This produces
a low noise square wave, buffered from the REF± differential
inputs. The output is self-biased and must be AC-coupled
with a 22nF capacitor.
STAT (Pin 3): Status Output. This signal is a configurable
logical OR combination of the UNLOK, LOK, THI and TLO
status bits, programmable via the STATUS register. See
the Operations section for more details.
CS (Pin 4): Serial Port Chip Select. This CMOS input initi-
ates a serial port communication burst when driven low,
ending the burst when driven back high. See the Operations
section for more details.
SCLK (Pin 5): Serial Port Clock. This CMOS input clocks
serial port input data on its rising edge. See the Operations
section for more details.
SDI (Pin 6): Serial Port Data Input. The serial port uses
this CMOS input for data. See the Operations section for
more details.
SDO (Pin 7): Serial Port Data Output. This CMOS three-
state output presents data from the serial port during a
read communication burst. Optionally attach a resistor
of >200k to GND to prevent a floating output. See the
Operations section for more details.
VD+ (Pin 8): 3.15V to 3.45V Positive Supply Pin for Serial
Port Circuitry. This pin should be bypassed directly to the
ground plane using a 0.1μF ceramic capacitor as close to
the pin as possible.
MUTE (Pin 9): RF Mute. The CMOS active-low input mutes
the RF± differential outputs while maintaining internal bias
levels for quick response to de-assertion.
GND (Pins 10, 17, 18, 19, 20, 21): Negative Power Supply
(Ground). These pins should be tied directly to the ground
plane with multiple vias for each pin.
RF–, RF+ (Pins 11, 12):
RF Output Signals. The VCO
output divider is buffered and presented differentially on
these pins. The outputs are open collector, with 136Ω
(typical) pull-up resistors tied to VRF+ to aid impedance
matching. If used single-ended, the unused output should
be terminated to 50Ω. See the Applications Information
section for more details on impedance matching.
VRF+ (Pin 13): 3.15V to 3.45V Positive Supply Pin for
RF Circuitry. This pin should be bypassed directly to the
ground plane using a 0.01μF ceramic capacitor as close
to the pin as possible.
BB (Pin 14): RF Reference Bypass. This output must be
bypassed with a 1.0μF ceramic capacitor to GND. Do not
couple this pin to any other signal.
VCO–, VCO+ (Pins 15, 16):
VCO Input Signals. The dif-
ferential signal placed on these pins is buffered with a low
noise amplifier and fed to the internal output and feedback
dividers. These self-biased inputs must be AC-coupled
and present a single-ended 121Ω (typical) resistance
to aid impedance matching. They may be used single-
ended by bypassing VCO– to GND with a capacitor. See
the Applications Information section for more details on
impedance matching.
VVCO+ (Pin 22): 3.15V to 3.45V Positive Supply Pin for
VCO Circuitry. This pin should be bypassed directly to the
ground plane using a 0.01μF ceramic capacitor as close
to the pin as possible.
GND (23): Negative Power Supply (Ground). This pin is
attached directly to the die attach paddle (DAP) and should
be tied directly to the ground plane.
VCP+(Pin24):3.15Vto5.25VPositiveSupplyPinforCharge
Pump Circuitry. This pin should be bypassed directly to
the ground plane using a 0.1μF ceramic capacitor as close
to the pin as possible.
CP (Pin 25): Charge Pump Output. This bi-directional cur-
rent output is normally connected to the external loop filter.
See the Applications Information section for more details.
PIN FUNCTIONS
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC6946-1 | 制造商:LINER 制造商全称:Linear Technology 功能描述:30MHz to 1.4GHz IQ Demodulator |
| LTC6946-2 | 制造商:LINER 制造商全称:Linear Technology 功能描述:30MHz to 1.4GHz IQ Demodulator |
| LTC6946-3 | 制造商:LINER 制造商全称:Linear Technology 功能描述:30MHz to 1.4GHz IQ Demodulator |
| LTC6946IUFD-1#PBF | 功能描述:IC INTEGER-N PLL W/VCO 28-QFN RoHS:是 类别:集成电路 (IC) >> 时钟/计时 - 时钟发生器，PLL，频率合成器 系列:- 标准包装:2,000 系列:- 类型:PLL 频率合成器 PLL:是 输入:晶体 输出:时钟 电路数:1 比率 - 输入:输出:1:1 差分 - 输入:输出:无/无 频率 - 最大:1GHz 除法器/乘法器:是/无 电源电压:4.5 V ~ 5.5 V 工作温度:-20°C ~ 85°C 安装类型:表面贴装 封装/外壳:16-LSSOP（0.175"，4.40mm 宽） 供应商设备封装:16-SSOP 包装:带卷 (TR) 其它名称:NJW1504V-TE1-NDNJW1504V-TE1TR |
| LTC6946IUFD-1#TRPBF | 功能描述:IC INTEGER-N PLL W/VCO 28QFN RoHS:是 类别:集成电路 (IC) >> 时钟/计时 - 时钟发生器，PLL，频率合成器 系列:- 标准包装:1,000 系列:Precision Edge® 类型:时钟/频率合成器 PLL:无 输入:CML，PECL 输出:CML 电路数:1 比率 - 输入:输出:2:1 差分 - 输入:输出:是/是 频率 - 最大:10.7GHz 除法器/乘法器:无/无 电源电压:2.375 V ~ 3.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:16-VFQFN 裸露焊盘，16-MLF? 供应商设备封装:16-MLF?（3x3） 包装:带卷 (TR) 其它名称:SY58052UMGTRSY58052UMGTR-ND |
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