参数资料
| 型号： | MCP4812-E/MS |
| 厂商： | Microchip Technology |
| 文件页数： | 11/19页 |
| 文件大小： | 0K |
| 描述： | DAC 10BIT DUAL SPI/VREF 8MSOP |
| 标准包装： | 100 |
| 设置时间： | 4.5µs |
| 位数： | 10 |
| 数据接口： | 串行，SPI? |
| 转换器数目： | 2 |
| 电压电源： | 单电源 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 8-MSOP |
| 包装： | 管件 |
| 输出数目和类型： | 2 电压，单极；2 电压，双极 |
| 采样率（每秒）： | * |
| 产品目录页面： | 673 (CN2011-ZH PDF) |
2011-2012 Microchip Technology Inc.
Preliminary
DS22280C-page 29
MCP795W1X/MCP795W2X
In the case where the MSB of the Calibration register
is set to ‘1’, the CLKOUT output waveforms that
appear when bits RS1 and RS0 are set to ‘01’ or ‘10’
are not as responsive to the setting of the Calibration
register. For example, when outputting the 4.096 kHz
waveform (RS1, RS0 set to ‘01’), the output waveform
is generated using only eight input clock cycles.
Consequently, attempting to subtract more than eight
input clock cycles from this output does not have a
meaningful affect on the resulting waveform. Any
affect on the output will appear as a modification in
both the frequency and duty cycle of the waveform
appearing on the CLKOUT output pin.
Method 2. RS2 bit set to ‘1’
With the RS2 bit set to ‘1’, the following internal timing
signal is output on the CLKOUT pin:
The frequency listed in the table presumes an input
clock source of exactly 32.768 kHz. In terms of the
equivalent number of input clock cycles, the table
becomes:
Unlike
the
method
previously
described,
the
calibration setting is continuously applied and affects
every cycle of the output waveform. This results in the
modulation of the frequency of the output waveform
based upon the setting of the Calibration register.
Using this setting, the calibration function can be
expressed as:
Since the calibration is done every cycle, the frequency
of the output CLKOUT waveform is constant.
FIGURE 9-1:
CLKOUT WAVEFORM
RS2
RS1
RS0
Output Signal
1x
x
1.0 Hz
RS2
RS1
RS0
Output Signal
1x
x
32768
Toutput
=
(32768 +/- (2 * CALREG)) Tinput
where:
Toutput
=
clock period of CLKOUT output
signal
Tinput
=
clock period of input signal
CALREG
=
decimal value of Calibration
register setting and the sign is
determined by the CALSGN bit.
Delay
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