Datasheet > ATR2730-TLQY

ATR2730-TLQY

更新时间： 2024-02-24 14:16:56

品牌	Logo	应用领域
爱特美尔 - ATMEL		/
页数	文件大小	规格书
18页	274K
描述
L-band Down-converter for DAB Receivers

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ATR2730-TLQY 技术参数

是否Rohs认证：	符合	生命周期：	Obsolete
Reach Compliance Code：	unknown	风险等级：	5.84
特性阻抗：	50 Ω	构造：	COMPONENT
下变频增益-最小值：	20 dB	最大中频频率：	250 MHz
最小中频频率：	150 MHz	JESD-609代码：	e3
最大噪声指数：	10 dB	最高工作温度：	85 °C
最低工作温度：	-40 °C	最大射频输入频率：	1550 MHz
最小射频输入频率：	1400 MHz	射频/微波设备类型：	DOWN CONVERTER
端子面层：	Matte Tin (Sn) - annealed	最大电压驻波比：	2
Base Number Matches：	1

ATR2730-TLQY 数据手册

ATR2730 [Preliminary]

Table 3-1.

Scaling Factors of the Reference Frequency

Reference Oscillator

Frequency

Voltage at Pin SI1

Voltage at Pin SI2

OPEN

VCC

ref

GND

OPEN

VCC

18.432 MHz

–

GND

24.576 MHz

OPEN

VCC

–

GND

32.768 MHz

17.920 MHZ

16.384 MHz

–

OPEN

VCC

GND

3.8

Reference Oscillator

An on-chip crystal oscillator generates the reference signal which is fed to the reference divider.

By connecting a quartz crystal to pins OSCE and OSCB according to Figure 11-2 on page 16,

this oscillator generates a highly stable reference signal. The ATR2731 (Atmel’s one-chip

front-end IC) offers the reference signal at pin FREF. This reference signal (LC filtered to sup-

press harmonics) can be used to overdrive the oscillator. In this application (see Figure 11-3 on

page 16) the reference signal has to be applied to the pin OSCB and the pin OSCE must be left

open.

3.9

Reference Divider

Nine different scaling factors of the reference divider can be selected by different voltage set-

tings at the input pins SI1 and SI2: 32, 33⁽¹⁾, 35, 36, 48, 49⁽¹⁾, 63^(1),64, 65⁽¹⁾. The reference

divider factors result in reference oscillator frequencies shown in Table 3-1.

Note:

1. These scaling factors result in an output frequency of the reference divider of 512 kHz. If har-

monics of the Bd. 3 VCO fall in the L-band reception band, these spurious signals can

influence the AGC of ATR2730, which could be a problem for small incoming signals. In this

case it is possible to switch the reference divider from n_refto n_ref+ 1.

3.10 LO Divider

The LO divider is operated at the fixed division ratio 2464. Assuming the settings described in

the section “Reference Divider” , the oscillator's frequency is controlled to be 1261.568 MHz in

the locked state, and the output frequency of the RF divider is 512 kHz.

3.11 Phase Comparator, Charge Pump and Loop Filter

The tri-state phase detector causes the charge pump to source or sink current at the output pin

PD depending on the phase relation of its input signals, which are provided by the reference and

the RF divider respectively. Using the control pin CI, two different values of this current can be

selected, and the charge-pump current can be switched off.

The input of the high-gain amplifier (output pin CD), which is implemented in order to construct a

loop filter as shown in the application circuit, can be switched to GND by means of the control

pin CI (see Table 3-2 on page 8). In the application circuit, the loop filter is completed by con-

necting the pins PD and CD by an appropriate RC network.

4903C–DAB–03/07

1...4 5 678 9 10...18

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与ATR2730-TLQY相关器件

型号	品牌	描述	获取价格	数据表
ATR2730-TLSY	ATMEL	L-band Down-converter for DAB Receivers	获取价格
ATR2731	ATMEL	DAB One-chip Front End	获取价格
ATR2731-ILQY	ATMEL	DAB One-chip Front End	获取价格
ATR2731-ILSY	ATMEL	DAB One-chip Front End	获取价格
ATR2732	ATMEL	Integrated DAB One-chip Front End	获取价格
ATR2732N1	ATMEL	Integrated DAB One-chip Front End	获取价格

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