- 您现在的位置：买卖IC网 > PDF目录98150 > T4260ILS (ATMEL CORP) AUDIO TUNER, PDSO44 PDF资料下载
参数资料
| 型号： | T4260ILS |
| 厂商： | ATMEL CORP |
| 元件分类： | 调谐器 |
| 英文描述： | AUDIO TUNER, PDSO44 |
| 封装： | SSO-44 |
| 文件页数： | 17/30页 |
| 文件大小： | 299K |
| 代理商： | T4260ILS |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页当前第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页
24
T4260
4528I–AUDR–08/04
There are also two HCDEL registers (for the high current CP delay time) but only one of
them is active. One of the HCDEL registers can be activated by bit 18. The delay time of
the HCDEL register can be selected with bit 20 and bit 21 or bit 22 and bit 23). The
current for the high CP (HCCP) can be set by bit 62 and the current for the low current
CP (LCCP) by bit 63.
With bit 145 the AM- or FM-Loopfilter (pin) can be activated. It is also possible to use the
AM-Loopfilter in FM mode (instead of the FM-Loopfilter) or the FM-Loopfilter in AM
mode.
High-speed Tuning
The fractional mode (bit 144 = 0) in connection with the direct shift mode (bit 32 = 0)
al low s ver y fa st f r equ ency ch ang es w i th fo ur tim e s t he st ep fr eq uen cy
(50 kHz = 4
× f
PDF) at low frequency steps (e.g., fPDF = 12.5 kHz). In direct shift mode,
the R- and the N-divider are shifted by 2 bits to the right (this corresponds to a R- and
N-divider division by 4 or a step frequency multiplication by 4).
Due to the 2-bit shift, a faster tuning response time of approximately 1 ms instead of
3-4 ms for a tune over the whole FM band from 87.5 MHz to 108 MHz is possible with
f
PDF =12.5 kHz.
If the FM receiving frequency is 103.2125 MHz (with e.g. f
PDF = 12.5 k Hz a nd
f
IF = 10.7 MHz), an N-divider of 9113 and an R-divider of 12 are necessary when using a
reference-frequency (f
ref) of 150 kHz.
f
VCO = fIF + frec = 10.7 MHz + 103.2125 MHz = 113.9125 MHz
f
PDF = fVCO/N = fref/R = 113.9125 MHz/9113 = 150 kHz/12 = 12.5 kHz
An important condition for the use of the fractional mode is an R-divider with an integer
value after the division by 4 (R-dividers have to be a multiple of 4).
After a 2-bit shift (divider division by 4), the R-divider is now 3 (instead of 12) and the
N-divider is 2278.25 (instead of 9113). The new N-divider of 2278.25 is also called
fractional step because the modulo value of the N-divider is 0.25 = . In total, there are
4 different fractional 2-bit shift steps: full, , and step.
If the fractional mode is switched off (bit 144 = 1) during direct shift mode (bit 32 = 0), the
modulo value of the N-divider will be ignored (the new N-divider is then 2278 instead of
2278.25). This means that the PLL locks on the next lower multiple frequency of 4
× f
PDF
(in our case f
PDF = 12.5 kHz). The new VCO frequency (fVCO) is then 113.9 MHz (instead
of 113.9125 MHz in fractional mode).
Also the PLL has additionally a special fractional logic which allows a good spurious
suppression in the fractional and direct shift mode. Activating the wire switch (bit 60 = 1)
and the correction charge pump (bit 60 = 1) the spurious suppression is active.
相关PDF资料 |
PDF描述 |
|---|---|
| T555200-PAE | SPECIALTY CONSUMER CIRCUIT, PXMA |
| T6B70BFNG | SPECIALTY ANALOG CIRCUIT, PDSO16 |
| T6F18 | SPECIALTY CONSUMER CIRCUIT, PQFP80 |
| T6N71B | SPECIALTY CONSUMER CIRCUIT, PQFP48 |
| T6N71QFP | SPECIALTY CONSUMER CIRCUIT, PQFP44 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| T4260-ILSH | 功能描述:射频无线杂项 COM.RADIO-AM/FM FE DIG.CONCEPT RoHS:否 制造商:Texas Instruments 工作频率:112 kHz to 205 kHz 电源电压-最大:3.6 V 电源电压-最小:3 V 电源电流:8 mA 最大功率耗散: 工作温度范围:- 40 C to + 110 C 封装 / 箱体:VQFN-48 封装:Reel |
| T428P107M028AH | 功能描述:钽质电容器-固体SMD RoHS:否 制造商:AVX 电容:100 uF 电压额定值:20 V ESR: 容差:10 % 外壳代码 - in:2917 外壳代码 - mm:7343 高度:4.1 mm 制造商库存号:E Case 工作温度范围:- 55 C to + 125 C 系列:TBM 产品:Tantalum Solid Low ESR Commercial Grade 封装:Bulk |
| T428P156M050AH | 功能描述:钽质电容器-固体SMD RoHS:否 制造商:AVX 电容:100 uF 电压额定值:20 V ESR: 容差:10 % 外壳代码 - in:2917 外壳代码 - mm:7343 高度:4.1 mm 制造商库存号:E Case 工作温度范围:- 55 C to + 125 C 系列:TBM 产品:Tantalum Solid Low ESR Commercial Grade 封装:Bulk |
| T428P156M050AH6110 | 功能描述:钽质电容器-固体SMD 50volts 15uF 20% RoHS:否 制造商:AVX 电容:100 uF 电压额定值:20 V ESR: 容差:10 % 外壳代码 - in:2917 外壳代码 - mm:7343 高度:4.1 mm 制造商库存号:E Case 工作温度范围:- 55 C to + 125 C 系列:TBM 产品:Tantalum Solid Low ESR Commercial Grade 封装:Bulk |
| T428P156M050AHT500 | 制造商:KEMET Corporation 功能描述:CAP TANT 15UF 50V 20% 2824 |
发布紧急采购，3分钟左右您将得到回复。