ADF7012

更新时间： 2024-01-05 11:29:37

品牌	Logo	应用领域
亚德诺 - ADI		ISM频段
页数	文件大小	规格书
28页	893K
描述
Multichannel ISM Band FSK/GFSK/OOK/GOOK/ASK Transmitter

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中文翻译

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技术参数
数据手册

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ADF7012 技术参数

是否无铅：	不含铅	是否Rohs认证：	符合
生命周期：	Active	零件包装代码：	TSSOP
包装说明：	TSSOP,	针数：	24
Reach Compliance Code：	unknown	风险等级：	5.07
Is Samacsys：	N	JESD-30 代码：	R-PDSO-G24
JESD-609代码：	e3	长度：	7.8 mm
湿度敏感等级：	1	功能数量：	1
端子数量：	24	最高工作温度：	85 °C
最低工作温度：	-40 °C	封装主体材料：	PLASTIC/EPOXY
封装代码：	TSSOP	封装形状：	RECTANGULAR
封装形式：	SMALL OUTLINE, THIN PROFILE, SHRINK PITCH	峰值回流温度（摄氏度）：	260
认证状态：	COMMERCIAL	座面最大高度：	1.2 mm
标称供电电压：	3 V	表面贴装：	YES
电信集成电路类型：	TELECOM CIRCUIT	温度等级：	INDUSTRIAL
端子面层：	MATTE TIN	端子形式：	GULL WING
端子节距：	0.65 mm	端子位置：	DUAL
处于峰值回流温度下的最长时间：	40	宽度：	4.4 mm
Base Number Matches：	1

ADF7012 数据手册

ADF7012

915 MHZ OPERATION

Deviation

The recommendations here are guidelines only. The design

should be subject to internal testing prior to FCC site testing.

Matching components need to be adjusted for board layout.

The deviation is set to 19.2 kHz so as to accommodate a

simple receiver architecture, and also to ensure the available

spectrum is used efficiently.

FCC 15.247 and FCC 15.249 are the main regulations governing

operation in the 902 MHz to 928 MHz Band. FCC 15.247

requires some form of spectral spreading. Typically, the

ADF7012 would be used in conjunction with the frequency

hopping spread spectrum (FHSS) or it may be used in

conjunction with the digital modulation standard which

requires large deviation frequencies. Output power of < 1 W

is tolerated on certain spreading conditions.

The modulation steps available are in 10 MHz/2¹⁴:

Modulation steps = 610 Hz

Modulation number = 19.2 kHz/610 Hz = 31.

Bias Current

Because low current is desired, a 3 mA VCO bias can be used

and still ensure oscillation at 928 MHz. Additional bias current

reduces any spurious noise, but increases current consumption.

A 3 mA bias current gives the best spurious vs. phase noise

trade-off.

Compliance with FCC 15.249 limits the output power to

−1.5 dBm, but does not require spreading. There are many

different applications in this band, including remote controls

for security, sensor interrogation, metering, and home control.

The PA bias should be set to 5.5 mA to achieve 10 dBm power.

Loop Filter Bandwidth

Design Criteria

915.2MHz center frequency

FSK modulation

10 dBm output power

200 m range

The loop filter is designed with ADIsimPLL Version 2.5. A

data rate of 170 kHz is chosen, which allows for data rates of

> 38.4 kbps. It also attenuates the beat note spurs quickly to

ensure they have no effect on system performance.

Meets FCC 15.247

38.4 kbps data rate

Design of Harmonic Filter

The main requirement of the harmonic filter should ensure

that the third harmonic level is < −41.5 dBm. A fifth-order

Chebyshev filter is recommended to achieve this, and a

suggested starting point is given next. The Pi format is chosen

to minimize the number of inductors in the system.

The center frequency is 915.2 MHz. It is possible to operate

the VCO at this frequency. Figure 36 shows the inductor value

vs. center frequency. The inductor chosen is 1.6 nH. Coilcraft

inductors such as 0603-CS-1N6XJBU are recommended.

Additional hopping frequencies can easily be generated by

changing the N value.

Component Values—Crystal: 10 MHz

Loop Filter

Crystal and PFD

Icp

LBW

1.44 mA

170 kHz

470 pF

12 nF

The phase noise requirement is such to ensure that the 20 dB

bandwidth requirements are met. These are dependant on the

channel spacing chosen. A typical channel spacing would be

400 kHz, which would allow 50 channels in 20 MHz and enable

the design to avoid the edges of the band.

120 pF

470 V

1.8 kV

The PFD is chosen so as to minimize spurious levels. There are

beat note spurious levels at 910 MHz and 920 MHz, but the

level is usually significantly less than the modulation power.

They are also attenuated quickly by the loop filter to ensure a

quick crystal power-up time.

Matching

C14

C15

27 nH

6.2 nH

470 pF

Open

PFD = 10 MHz − Power-Up Time 1.8 ms (approximately).

Figure 10 shows a typical power-on time for a 4 MHz crystal.

Harmonic Filter

CF1

CF2

CF3

8.2 nH

4.7 pF

6.8 pF

4.7 pF

N-Divider

The N divider is determined as being:

Nint = 91

Nfrac = (2130)/4096

VCO divide-by-2 is not enabled

Rev. 0 | Page 23 of 28

1...20 21 222324 25 26...28

中文翻译

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与ADF7012相关器件

型号	品牌	获取价格	描述	数据表
ADF7012BRU	ADI	获取价格	Multichannel ISM Band FSK/GFSK/OOK/GOOK/ASK Transmitter
ADF7012BRU	ROCHESTER	获取价格	SPECIALTY TELECOM CIRCUIT, PDSO24, MO-153AD, TSSOP-24
ADF7012BRU-REEL	ADI	获取价格	Multichannel ISM Band FSK/GFSK/OOK/GOOK/ASK Transmitter
ADF7012BRU-REEL7	ADI	获取价格	Multichannel ISM Band FSK/GFSK/OOK/GOOK/ASK Transmitter
ADF7012BRU-U1	ADI	获取价格	IC,RF MODULATOR,CMOS,TSSOP,24PIN,PLASTIC
ADF7012BRUZ	ADI	获取价格	Multichannel ISM Band FSK/GFSK/OOK/GOOK/ASK Transmitter
ADF7012BRUZ	ROCHESTER	获取价格	SPECIALTY TELECOM CIRCUIT, PDSO24, ROHS COMPLIANT, MO-153AD, TSSOP-24
ADF7012BRUZ-REEL7	ADI	获取价格	SPECIALTY TELECOM CIRCUIT, PDSO24, MO-153AD, TSSOP-24
ADF7012BRUZ-RL	ADI	获取价格	Multichannel ISM Band FSK/GFSK/OOK/GOOK/ASK Transmitter
ADF7012BRUZ-RL	ROCHESTER	获取价格	SPECIALTY TELECOM CIRCUIT, PDSO24, ROHS COMPLIANT, MO-153AD, TSSOP-24

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