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参数资料
| 型号： | ATR4256-TKSY |
| 厂商： | Atmel |
| 文件页数： | 10/21页 |
| 文件大小： | 0K |
| 描述： | IC FREQ SYNTH RADIO TUNER 20SSOP |
| 产品变化通告： | ATR425x Obsolescence 03/Apr/2012 |
| 标准包装： | 830 |
| 功能： | 频率合成器 |
| RF 型： | 广播无线电 |
| 次要属性： | 缓冲输出 |
| 封装/外壳： | 20-SOIC（0.209"，5.30mm 宽） |
| 包装： | 管件 |
4.10
SWO1, SWO2, SWO3 and SWO4 (Pins 7 to 10)
All switching outputs are “open drain” and can be set and reset by software control. Details are
described in the data transfer protocol.
The switching output SWO1 to SWO4 can be controlled as follows (B30 to B33):
Table 4-9.
SWO1 to SWO4 Setting
X = 0 to 3
Switch Output
SWOx = ON (switch to GND)
SWOx = OFF
B30 + X
0
1
Figure 4-8.
Internal Components at SWO1, SWO2, SWO3 and SWO4
SWO1
SWO2
SWO3
SWO4
I
4.11
OSCIN, OSCOUT (Pin 12 and Pin 13)
A crystal resonator (up to 15 MHz) is connected between OSCIN and OSCOUT in order to gen-
erate the reference frequency. By using the ATR4256 in connection with ATR4255 or ATR4258,
the crystal frequency must be 10.25 MHz. The complete application circuit is shown in Figure
6-2 . If a reference is available, it can be applied at OSCIN. The minimum voltage should be
100 mVrms. In this case, pin OSCOUT has to be open.
The tuning capacity for the crystal oscillator has a range of 0.5 pF to 71.5 pF. The values are
coded binary. The tuning can be controlled by B78 to B85 as follows:
Table 4-10.
B85 = 1
Crystal Tuning Capacitance
B85 = 0
[pF]
0
0.5
1.0
1.5
...
63.0
63.5
[pF]
8.0
8.5
9.0
19.5
...
71.0
71.5
B84
1
1
1
1
...
0
0
B83
1
1
1
1
...
0
0
B82
1
1
1
1
...
0
0
B81
1
1
1
1
...
0
0
B80
1
1
1
1
...
0
0
B79
1
1
0
0
...
0
0
B78
1
0
1
0
...
0
0
10
ATR4256
4867D–AUDR–01/08
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