- 您现在的位置：买卖IC网 > PDF目录69523 > TRF3761-AIRHATG4 (TEXAS INSTRUMENTS INC) PLL FREQUENCY SYNTHESIZER, 104 MHz, PQCC40 PDF资料下载
参数资料
| 型号： | TRF3761-AIRHATG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | PLL合成/DDS/VCOs |
| 英文描述： | PLL FREQUENCY SYNTHESIZER, 104 MHz, PQCC40 |
| 封装： | GREEN, PLASTIC, MO-220VJJD-2, QFN-40 |
| 文件页数： | 35/60页 |
| 文件大小： | 1736K |
| 代理商： | TRF3761-AIRHATG4 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页当前第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页第47页第48页第49页第50页第51页第52页第53页第54页第55页第56页第57页第58页第59页第60页
FUNCTIONAL DESCRIPTION
VCO
Divide by 2, by 4, and Output Buffer
N-Divider
OUT
F
200MHz
Prescalarnum
(3)
SLWS181J – OCTOBER 2005 – REVISED AUGUST 2008 ............................................................................................................................................... www.ti.com
B<12,0>: This 13-bit word <DB24,DB12> controls the value of the B counter of the N divider. The valid range is
from 3 to 8191.
A<5,0>: These 6 bits <DB11,DB6> control the value of the A counter. The valid range is from 0 to 63.
PRESC_MOD<1,0>: These bits <DB5,DB4> define the mode of the dual-modulus prescaler according to
START_LK: TRF3761 does not load the serial interface registers values into the dividers registers until bit DB29
of register 3 is set to 1. After TRF3761 is locked to the new frequency, bit DB29 is internally reset to 0.
Refer to Register 3 under the Application Information section.
The TRF3761 integrates a high-performance, LC tank, voltage-controlled oscillator (VCO). For each of the
devices of the TRF3761 family, the inductance and capacitance of the tank are optimized to yield the best
phase-noise performance. The VCO output is fed externally and to the prescaler through a series of very low
noise buffers, that greatly reduce the effect of load pulling onto the VCO.
To extend the frequency coverage, the TRF3761 integrates a divide by 2 and by 4 with a low noise floor. The
VCO signal is fed externally through a final open-collector differential-output buffer. This buffer is able to provide
up to 3dBm (typical) of power into a 200
differential resistive load. The open-collector structure gives the
flexibility to choose different load configurations to meet different requirements.
Prescaler Stage
This stage divides down the VCO frequency before the A and B counters. This is a dual-modulus prescaler
and the user can select any of the following settings: 8/9, 16/17, 32/33, and 64/65. Prescaling is used due to
the fact that the internal devices are limited in frequency operations of 200MHz. To determine the proper
prescaler value, Fout which is the frequency out of the VCO is divided by the numerator of the prescaler if
the answer is less than 200MHz then that is the prescalar to use, see Equation 3. If the value is higher than
200MHz then repeat this procedure with the next prescalar numerator until a value of 200MHz or less is
achieved. See the Synthesizing a Selected Frequency in the Section 10 Register 3.
A and B Counter Stage
The TRF3761 includes a 6-bit A counter and a 13-bit B counter that operate on the output of the prescaler.
The A counter can take values from 0 to 63, while the B counter can take values from 3 to 8191. Also, the
value for the B counter must be greater than or equal to the value for the A counter. The A and B counter
with the prescaler stage create the VCO N-divider, see Equation 4 and Equation 5. Refer to Synthesizing a
Selected Frequency in the Section 10 Register 3.
40
Copyright 2005–2008, Texas Instruments Incorporated
Product Folder Link(s): TRF3761
相关PDF资料 |
PDF描述 |
|---|---|
| TRF3761-EIRHAR | PLL FREQUENCY SYNTHESIZER, 104 MHz, PQCC40 |
| TRF3761-CIRHATG4 | PLL FREQUENCY SYNTHESIZER, 104 MHz, PQCC40 |
| TRF3761-JIRHATG4 | PLL FREQUENCY SYNTHESIZER, 104 MHz, PQCC40 |
| TRF3761-HIRHAT | PLL FREQUENCY SYNTHESIZER, 104 MHz, PQCC40 |
| TRF3761-EIRHAT | PLL FREQUENCY SYNTHESIZER, 104 MHz, PQCC40 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TRF3761-B | 制造商:TI 制造商全称:Texas Instruments 功能描述:INTEGER-N PLL WITH INTEGRATED VCO |
| TRF3761-BIRHAR | 功能描述:时钟合成器/抖动清除器 Low Noise Integer N PLL Freq Synth RoHS:否 制造商:Skyworks Solutions, Inc. 输出端数量: 输出电平: 最大输出频率: 输入电平: 最大输入频率:6.1 GHz 电源电压-最大:3.3 V 电源电压-最小:2.7 V 封装 / 箱体:TSSOP-28 封装:Reel |
| TRF3761-BIRHARG4 | 功能描述:时钟合成器/抖动清除器 Low Noise Integer N PLL Freq Synth RoHS:否 制造商:Skyworks Solutions, Inc. 输出端数量: 输出电平: 最大输出频率: 输入电平: 最大输入频率:6.1 GHz 电源电压-最大:3.3 V 电源电压-最小:2.7 V 封装 / 箱体:TSSOP-28 封装:Reel |
| TRF3761-BIRHAT | 功能描述:时钟合成器/抖动清除器 Low Noise Integer N PLL Freq Synth RoHS:否 制造商:Skyworks Solutions, Inc. 输出端数量: 输出电平: 最大输出频率: 输入电平: 最大输入频率:6.1 GHz 电源电压-最大:3.3 V 电源电压-最小:2.7 V 封装 / 箱体:TSSOP-28 封装:Reel |
| TRF3761-BIRHATG4 | 功能描述:时钟合成器/抖动清除器 Low Noise Integer N PLL Freq Synth RoHS:否 制造商:Skyworks Solutions, Inc. 输出端数量: 输出电平: 最大输出频率: 输入电平: 最大输入频率:6.1 GHz 电源电压-最大:3.3 V 电源电压-最小:2.7 V 封装 / 箱体:TSSOP-28 封装:Reel |
发布紧急采购，3分钟左右您将得到回复。