ATA5760

更新时间： 2024-01-22 23:25:25

品牌	Logo	应用领域
爱特美尔 - ATMEL		/
页数	文件大小	规格书
41页	671K
描述
UHF ASK/FSK Receiver

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ATA5760 技术参数

是否无铅：	不含铅	是否Rohs认证：	符合
生命周期：	Obsolete	零件包装代码：	SOIC
包装说明：	SOP, SOP20,.4	针数：	20
Reach Compliance Code：	compliant	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	风险等级：	5.83
JESD-30 代码：	R-PDSO-G20	JESD-609代码：	e3
长度：	12.825 mm	湿度敏感等级：	1
功能数量：	1	端子数量：	20
最高工作温度：	105 °C	最低工作温度：	-40 °C
封装主体材料：	PLASTIC/EPOXY	封装代码：	SOP
封装等效代码：	SOP20,.4	封装形状：	RECTANGULAR
封装形式：	SMALL OUTLINE	峰值回流温度（摄氏度）：	260
电源：	5 V	认证状态：	Not Qualified
座面最大高度：	2.6 mm	子类别：	Other Telecom ICs
最大压摆率：	0.0099 mA	标称供电电压：	5 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 (Sn) - annealed
端子形式：	GULL WING	端子节距：	1.27 mm
端子位置：	DUAL	处于峰值回流温度下的最长时间：	40
宽度：	7.4 mm	Base Number Matches：	1

ATA5760 数据手册

3. RF Front End

The RF front end of the receiver is a low-IF heterodyne configuration that converts the input sig-

nal into an about 1 MHz IF signal with an image rejection of typical 30 dB. According to Figure

2-1 on page 3 the front end consists of an LNA (Low Noise Amplifier), LO (Local Oscillator), I/Q

mixer, polyphase lowpass filter and an IF amplifier.

The PLL generates the carrier frequency for the mixer via a full integrated synthesizer with inte-

grated low noise LC-VCO (Voltage Controlled Oscillator) and PLL-loop filter. The XTO (crystal

oscillator) generates the reference frequency f_XTO. The integrated LC-VCO generates two times

the mixer drive frequency f_VCO. The I/Q signals for the mixer are generated with a divide by two

circuit (f_LO= f_VCO/2). f_VCOis divided by a factor of 256 and feeds into a phase frequency detector

and compared with f_XTO. The output of the phase frequency detector is fed into an integrated

loop filter and thereby generates the control voltage for the VCO. If f_LOis determined, f_XTOcan be

calculated using the following formula:

f_XTO= f_LO/128

The XTO is a one-pin oscillator that operates at the series resonance of the quartz crystal with

high current but low voltage signal, so that there is only a small voltage at the crystal oscillator

frequency at pin XTAL. According to Figure 3-1, the crystal should be connected to GND with a

series capacitor C_L. The value of that capacitor is recommended by the crystal supplier. Due to a

somewhat inductive impedance at steady state oscillation and some PCB parasitics a lower

value of C_Lis normally necessary.

The value of C_Lshould be optimized for the individual board layout to achieve the exact value of

f_XTO(the best way is to use a crystal with known load resonance frequency to find the right value

for this capacitor) and hereby of f_LO. When designing the system in terms of receiving bandwidth

and local oscillator accuracy, the accuracy of the crystal and the XTO must be considered.

If a crystal with ±30 ppm adjustment tolerance at 25°C, ±50 ppm over temperature –40°C to

+105°C, ±10 ppm of total aging and a CM (motional capacitance) of 7 fF is used, an additional

XTO pulling of ±30 ppm has to be added.

The resulting total LO tolerance of ±120 ppm agrees with the receiving bandwidth specification

of the 600 kHz version of ATA5760/ATA5761 if the T5750 has also a total LO tolerance of

±120 ppm.

For the ATA5760N3 crystals with ±55 ppm total tolerance are needed for receiver and transmit-

ter to cope with the reduced IF-bandwidth.

Figure 3-1. XTO Peripherals

V_S

DVCC

C_L

XTAL

TEST 3

TEST 2

ATA5760/ATA5761

4896C–RKE–04/06

1 2 345 6 7...41

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与ATA5760相关器件

型号	品牌	描述	获取价格	数据表
ATA5760_08	ATMEL	UHF ASK/FSK Receiver	获取价格
ATA5760N3-TGQY	ATMEL	UHF ASK/FSK Receiver	获取价格
ATA5760N-TGQY	ATMEL	UHF ASK/FSK Receiver	获取价格
ATA5760N-TGSY	ATMEL	UHF ASK/FSK Receiver	获取价格
ATA5761	ATMEL	UHF ASK/FSK Receiver	获取价格
ATA5761N-TGQY	ATMEL	UHF ASK/FSK Receiver	获取价格

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