MICRF505DEV1【PDF 15/42 页】KIT DEV RADIOWIRE 850-950MHZ

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Micrel

Frequency Synthesizer

The MICRF505 frequency synthesizer consists of a

voltage-controlled oscillator (VCO), a crystal

oscillator, dual modulus prescaler, programmable

frequency dividers and a phase-detector. The loop-

filter is external for flexibility and can be a simple

passive circuit. The phase detector compares

frequencies of two signals and produces an error

signal which is proportional to the difference

between the input frequencies. The error signal is

used to control a voltage-controlled oscillator (VCO)

which creates an output frequency. The output

frequency is fed through a frequency divider back to

the input of the phase detector, producing a

feedback loop. If the output frequency drifts, the

error signal will increase, driving the frequency in the

opposite direction so as to reduce the error. Thus,

the output is locked to the frequency at the other

input. This input is called the reference and is

MICRF505BML/YML

derived from a crystal oscillator, which is very stable

in frequency. The block diagram below shows the

basic elements and arrangement of a PLL-based

frequency synthesizer. The MICRF505 has a dual

modulus prescaler for increased frequency

resolution. In a dual modulus prescaler the main

divider is split into two parts, the main part N and an

additional divider A, where A < N. Both dividers are

clocked from the output of the dual-modulus

prescaler, but only the output of the N divider is fed

into the phase detector. The prescaler will first divide

by 16. Both N and A count down until A reaches

zero, at which point the prescaler is switched to a

division ratio 16+1. At this point, the divider N has

completed A counts. Counting continues until N

reaches zero, which is an additional N-A counts. At

this point the cycle repeats.

A6…A0

0001010

0001011

0001100

0001101

0001110

0001111

0010000

0010001

0010010

0010011

D7

-

-

N0_7

-

M0_7

-

-

N1_7

-

M1_7

D6

-

-

N0_6

-

M0_6

-

-

N1_6

-

M1_6

D5

A0_5

-

N0_5

-

M0_5

A1_5

-

N1_5

-

M1_5

D4

A0_4

-

N0_4

-

M0_4

A1_4

-

N1_4

-

M1_4

D3

A0_3

N0_11

N0_3

M0_11

M0_3

A1_3

N1_11

N1_3

M1_11

M1_3

D2

A0_2

N0_10

N0_2

M0_10

M0_2

A1_2

N1_10

N1_2

M1_10

M1_2

D1

A0_1

N0_9

N0_1

M0_9

M0_1

A1_1

N1_9

N1_1

M1_9

M1_1

D0

A0_0

N0_8

N0_0

M0_8

M0_0

A1_0

N1_8

N1_0

M1_8

M1_0

October 2006

15

M9999-103106

+1 408-944-0800

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相关代理商/技术参数

MICRF505DEV1 制造商:Micrel Inc 功能描述:KIT MICRF505 EVALUATION

MICRF505L 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:850MHz and 950MHz ISM Band Transceiver

MICRF505LYML 制造商:Rochester Electronics LLC 功能描述: 制造商:RF Micro Devices Inc 功能描述:

MICRF505LYML TR 功能描述:射频收发器 850MHz to 950MHz, 2.25V to 5.5V FSK Transceiver with +10dBm Power Amplifier RoHS:否制造商:Atmel 频率范围:2322 MHz to 2527 MHz 最大数据速率:2000 Kbps 调制格式:OQPSK 输出功率:4 dBm 类型: 工作电源电压:1.8 V to 3.6 V 最大工作温度:+ 85 C 接口类型:SPI 封装 / 箱体:QFN-32 封装:Tray

MICRF505YML 制造商:Micrel Inc 功能描述:433/915MHZ ITRANSCEIVER SMD MLF32 制造商:Micrel Inc 功能描述:433/915MHZ ITRANSCEIVER, SMD, MLF32 制造商:Micrel Inc 功能描述:433/915MHZ ITRANSCEIVER, SMD, MLF32; Frequency Min:850MHz; Frequency Max:950MHz; Modulation Type:FSK; Sensitivity dBm:-111dBm; Data Rate:200Kbps; Supply Voltage Min:2V; Supply Voltage Max:2.5V; RF IC Case Style:MLF; No. of Pins:32; ;RoHS Compliant: Yes

MICRF505YML TR 功能描述:射频收发器 850MHz to 950MHz, 2.0V to 2.5V FSK Transceiver with +10dBm Power Amplifier RoHS:否制造商:Atmel 频率范围:2322 MHz to 2527 MHz 最大数据速率:2000 Kbps 调制格式:OQPSK 输出功率:4 dBm 类型: 工作电源电压:1.8 V to 3.6 V 最大工作温度:+ 85 C 接口类型:SPI 封装 / 箱体:QFN-32 封装:Tray

MICRF505YML-TR 功能描述:IC RF TxRx Only General ISM < 1GHz 850MHz ~ 950MHz 32-VFQFN Exposed Pad, 32-MLF? 制造商:microchip technology 系列:- 包装:剪切带（CT）零件状态:有效类型:仅限 TxRx 射频系列/标准:通用 ISM < 1GHz 协议:- 调制:FSK 频率:850MHz ~ 950MHz 数据速率（最大值）:200kbps 功率 - 输出:10dBm 灵敏度:-111dBm 存储容量:- 串行接口:SPI GPIO:- 电压 - 电源:2 V ~ 2.5 V 电流 - 接收:8.6mA ~ 13.5mA 电流 - 传输:14mA ~ 28mA 工作温度:-40°C ~ 85°C 封装/外壳:32-VFQFN 裸露焊盘，32-MLF? 标准包装:1

MICRF506 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:410MHz and 450MHz ISM Band Transceiver