Datasheet > ATA5744N-TKSY

ATA5744N-TKSY

更新时间： 2024-02-19 22:24:07

品牌	Logo	应用领域
爱特美尔 - ATMEL		电信光电二极管电信集成电路
页数	文件大小	规格书
20页	310K
描述
Telecom Circuit, 1-Func, PDSO20, LEAD FREE, SSO-20

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ATA5744N-TKSY 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：	SSOP, SSOP20,.25	针数：	20
Reach Compliance Code：	compliant	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	风险等级：	5.35
JESD-30 代码：	R-PDSO-G20	JESD-609代码：	e3
长度：	6.625 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：	SSOP
封装等效代码：	SSOP20,.25	封装形状：	RECTANGULAR
封装形式：	SMALL OUTLINE, SHRINK PITCH	峰值回流温度（摄氏度）：	260
电源：	5 V	认证状态：	Not Qualified
子类别：	Other Telecom ICs	最大压摆率：	0.0087 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：	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

ATA5744N-TKSY 数据手册

Figure 3-1. PLL Peripherals

V_S

DVCC

C_L

XTO

LFGND

R1 = 820 Ω

C9 = 4.7 nF

C10 = 1 nF

V_S

C10

LFVCC

The passive loop filter connected to pin LF is designed for a loop bandwidth of B_Loop= 100 kHz.

This value for B_Loopexhibits the best possible noise performance of the LO. Figure 3-1 shows

the appropriate loop filter components to achieve the desired loop bandwidth

f_LOis determined by the RF input frequency f_RFand the IF frequency f_IFusing the following

formula:

f_LO= f_RF– f_IF

To determine f_LO, the construction of the IF filter must be considered at this point. The nominal IF

frequency is f_IF= 1 MHz. To achieve a good accuracy of the filter's corner frequencies, the filter

is tuned by the crystal frequency f_XTO. This means that there is a fixed relation between f_IFand

f_LOthat depends on the logic level at pin mode. This is described by the following formulas:

MODE = 0 USA f_IF= f_LO/314

MODE = 1 Europe f_IF= f_LO/432.92

The relation is designed to achieve the nominal IF frequency of f_IF= 1 MHz for most applica-

tions. For applications where f_RF= 315 MHz, MODE must be set to '0'. In the case of

f_RF= 433.92 MHz, MODE must be set to '1'. For other RF frequencies, f_IFis not equal to 1 MHz.

f_IFis then dependent on the logical level at pin MODE and on f_RF. Table 3-1 on page 5 summa-

rizes the different conditions.

The RF input either from an antenna or from a generator must be transformed to the RF input

pin LNA_IN. The input impedance of that pin is provided in the electrical parameters. The para-

sitic board inductances and capacitances also influence the input matching. The RF receiver

ATA5744 exhibits its highest sensitivity at the best signal-to-noise ratio in the LNA. Hence, noise

matching is the best choice for designing the transformation network.

A good practice when designing the network, is to start with power matching. From that starting

point, the values of the components can be varied to some extent to achieve the best sensitivity.

If a SAW is implemented into the input network a mirror frequency suppression of ∆P_Ref= 40 dB

can be achieved. There are SAWs available that exhibit a notch at ∆f = 2 MHz. These SAWs

work best for an intermediate frequency of IF = 1 MHz. The selectivity of the receiver is also

improved by using a SAW. In typical automotive applications, a SAW is used.

ATA5744

4893A–RKE–11/05

1 2 345 6 7...20

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