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参数资料
| 型号： | ATR4256-TKSY |
| 厂商： | Atmel |
| 文件页数： | 8/21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 |
4.7
DAC1, DAC2 in AM Mode (Pin 3 and Pin 4)
In AM mode the DAC input voltage V (PDO) is internally connected to 3V. The gains of DAC1 and
DAC2 have a range of 0.46 × 3V to 3.03 × 3V. V (PDO) is the PLL tuning voltage output. This
range is divided into 256 steps; one step is approximately
(3.03 – 0.46) × 3V / 255 = 0.01007 × 3V. The gain of DAC1 can be controlled by B36 to B43
(bits 0 to 7 of DAC1 Gain) and the gain of DAC2 by B0 to B7 (bits 0 to 7 of DAC2 gain) as
follows:
Table 4-6.
DAC Gain, AM Mode
Gain DAC1,
Decimal
Approximately
B43
B42
B41
B40
B39
B38
B37
B36
Gain
Gain DAC2,
Decimal
Approximately
0.4607 × 3V
0.4710 × 3V
0.4812 × 3V
0.4915 × 3V
...
1.0029 × 3V
...
3.0097 × 3V
3.0196 × 3V
3.0296 × 3V
B7
0
0
0
0
...
0
...
1
1
1
B6
0
0
0
0
...
0
...
1
1
1
B5
0
0
0
0
...
1
...
1
1
1
B4
0
0
0
0
...
1
...
1
1
1
B3
0
0
0
0
...
0
...
1
1
1
B2
0
0
0
0
...
1
...
1
1
1
B1
0
0
1
1
...
0
...
0
1
1
B0
0
1
0
1
...
1
...
1
0
1
Gain
0
1
2
3
...
53
...
253
254
255
Offset = 31 (intermediate position)
Remark: V (PDO) is 3V in AM mode.
The offset of DAC1 and DAC2 has a range of +1.46V to –1.49V. This range is divided into 64
steps; one step is approximately 2.95 V/ 63 = 46.8 mV. The offset DAC1 can be controlled by
B44 to B49 (bits 0 to 5 of DAC1 Offset) and the offset of DAC2 by B8 to B13 (bits 0 to 5 of DAC2
Offset) as follows:
Table 4-7.
DAC Offset, AM Mode
Offset DAC1
Decimal
Approximately
B49
B48
B47
B46
B45
B44
Gain
Offset DAC2
Decimal
Approximately
1.4606V
1.4138V
1.3665V
1.3196V
...
–0.0079V
...
–1.3975V
–1.4447V
–1.4917V
B13
0
0
0
0
...
0
...
1
1
1
B12
0
0
0
0
...
1
...
1
1
1
B11
0
0
0
0
...
1
...
1
1
1
B10
0
0
0
0
...
1
...
1
1
1
B9
0
0
1
1
...
1
...
0
1
1
B8
0
1
0
1
...
1
...
1
0
1
Gain
0
1
2
3
...
31
...
61
62
63
Gain = 53 (intermediate position)
8
ATR4256
4867D–AUDR–01/08
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