Datasheet > ATR4285

ATR4285

更新时间： 2024-02-24 11:55:46

品牌	Logo	应用领域
爱特美尔 - ATMEL		/
页数	文件大小	规格书
13页	274K
描述
Reference Oscillator up to 15 MHz

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ATR4285 技术参数

是否Rohs认证：	符合	生命周期：	Obsolete
零件包装代码：	SOIC	包装说明：	LSSOP,
针数：	20	Reach Compliance Code：	unknown
HTS代码：	8542.39.00.01	风险等级：	5.84
模拟集成电路 - 其他类型：	PLL FREQUENCY SYNTHESIZER	JESD-30 代码：	R-PDSO-G20
JESD-609代码：	e3	长度：	6.75 mm
湿度敏感等级：	1	功能数量：	1
端子数量：	20	最高工作温度：	85 °C
最低工作温度：	-30 °C	封装主体材料：	PLASTIC/EPOXY
封装代码：	LSSOP	封装形状：	RECTANGULAR
封装形式：	SMALL OUTLINE, LOW PROFILE, SHRINK PITCH	认证状态：	Not Qualified
座面最大高度：	1.5 mm	最大供电电压 (Vsup)：	5.5 V
最小供电电压 (Vsup)：	4.5 V	标称供电电压 (Vsup)：	5 V
表面贴装：	YES	技术：	BICMOS
温度等级：	OTHER	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	宽度：	4.4 mm
Base Number Matches：	1

3. Functional Description

The ATR4285 is controlled via the 2-wire bus. One module-address byte, two subaddress bytes,

and five data bytes enable programming.

The module address contains a programmable address bit A1, which (along with address select

input AS, pin 4) enables the operation of two ATR4285 devices in one system. If bit A1 is identi-

cal with the status of the address select input AS, the chip is selected.

The subaddress determines which of the data bytes is transmitted first. If the subaddress of the

R-divider is transmitted, the sequence of the next data bytes is DB 0 (status), DB 1 and DB 2. If

the subaddress of the N-divider is transmitted, the sequence of the next data bytes is DB 3 and

DB 4. The bit organization of the module address, subaddress and data bytes is shown in Table

“Bit Organization” on page 9.

Each transmission on the bus begins with the "START" condition and must be ended by the

"STOP" condition (see Table “Transmission Protocol” on page 9).

The integrated circuit ATR4285 has two separate inputs for the AM and FM oscillators. Pre-

amplified AM and FM signals are fed to the 16-bit N-divider via the AM/FM switch. The AM/FM

switch is software controlled. Tuning steps can be selected by the 16-bit R-divider.

Furthermore, the device provides a digital memory phase detector and two separate current

sources for AM and FM amplifiers (charge pump) as given in the Table “Electrical Characteris-

tics” on page 5. The separate current sources (charge pumps) allow independent gain

adjustment, providing high current for high-speed tuning and low current for stable tuning.

ATR4285

4884A–AUDR–08/05

1 2 345 6 7...13

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