参数资料
型号: ATR4258-ILQH 19
厂商: Atmel
文件页数: 11/38页
文件大小: 0K
描述: IC RCVR AM/FM 3WIRE BUS 44SSOP
产品变化通告: ATR425x Obsolescence 03/Apr/2012
标准包装: 2,000
频率: 10.7MHz
调制或协议: AM,FM
应用: AM/FM 无线电接收器
电流 - 接收: 45mA
数据接口: PCB,表面贴装
天线连接器: PCB,表面贴装
电源电压: 8 V ~ 10 V
工作温度: -40°C ~ 85°C
封装/外壳: 44-SSOP(0.291",7.40mm 宽)
供应商设备封装: 44-SSO
包装: 带卷 (TR)
其它名称: ATR4258-ILQH
ATR4258-ILQH-ND
ATR4258
4.13
2 nd IF Output
The 2 nd IF after the gain-controlled 2 nd IF amplifier is available at pin 20 (bit 55 = 0). In AM mode,
this signal may be used for an external AM stereo decoder. Alternatively, a signal corresponding
to the logarithmic field strength after the integrated FM band filter, which is used for multipath
detection, can be switched to pin 20 by setting bit 55 = 1.
Table 4-15.
Pin 20 Output Setting
Pin 20
Bit 55
2
nd
IF output
0
Multipath field strength
1
4.14
Automatic IF Center Frequency Adjustment
Integrated active filters are used in the FM band filter, FM demodulator and adjacent channel
sensor. The center frequency of these filters is automatically adjusted to the second IF fre-
quency of 450 kHz. The frequency of 10.25 MHz at pin 22 is used as a reference for this
alignment.
Figure 4-2.
Automatic IF Center Frequency Adjustment
Pin 22
10.25 MHz
Pin 3 7
A u tom a tic
fre qu ency
a dj us tment
Bit 56 to 59
Center
fre qu ency
Center
fre qu ency
Bit 14 to 17
FM-Demod
FM-
ba nd filter
For fine tuning, the center frequency of all these integrated active filters (band filter and demod-
ulator) can be shifted in steps of 6.25 kHz by means of bit 56 to bit 59. Additionally, the center
frequency of the band filter can be adjusted separately by means of bit 14 to bit 17.
11
4838B–AUDR–05/05
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