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參數(shù)資料
| 型號： | MCP795W10T-I/SL |
| 廠商： | Microchip Technology |
| 文件頁數(shù)： | 5/13頁 |
| 文件大小： | 0K |
| 描述： | IC RTCC 1KB EE WD/EVENT 14SOIC |
| 標(biāo)準(zhǔn)包裝： | 2,600 |
| 類型： | 時(shí)鐘/日歷 |
| 特點(diǎn)： | 警報(bào)，EEPROM，閏年，方波輸出，SRAM，看門狗定時(shí)器 |
| 存儲(chǔ)容量： | 64B |
| 時(shí)間格式： | HH:MM:SS:hh（12/24 小時(shí)） |
| 數(shù)據(jù)格式： | YY-MM-DD-dd |
| 接口： | SPI |
| 電源電壓： | 1.8 V ~ 5.5 V |
| 電壓 - 電源，電池： | 1.3 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 14-SOIC（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 14-SOIC |
| 包裝： | 帶卷 (TR) |
MCP4902/4912/4922
DS22250A-page 28
2010 Microchip Technology Inc.
6.4
Single-Supply Operation
The MCP4902/4912/4922 family of devices are rail-to-
rail voltage output DAC devices designed to operate
with a VDD range of 2.7V to 5.5V. Its output amplifier is
robust enough to drive small-signal loads directly.
Therefore, it does not require any external output buffer
for most applications.
6.4.1
DC SET POINT OR CALIBRATION
A common application for the DAC devices is
digitally-controlled set points and/or calibration of
variable parameters, such as sensor offset or slope.
For example, the MCP4922 provides 4096 output
steps. If the external voltage reference (VREF) is
4.096V, the LSb size is 1 mV. If a smaller output step
size is desired, a lower external voltage reference is
needed.
6.4.1.1
Decreasing Output Step Size
If the application is calibrating the bias voltage of a
diode or transistor, a bias voltage range of 0.8V may be
desired with about 200 V resolution per step. Two
common methods to achieve a 0.8V range is to either
reduce VREF to 0.82V or use a voltage divider on the
DAC’s output.
Using a VREF is an option if the VREF is available with
the
desired
output
voltage
range.
However,
occasionally, when using a low-voltage VREF, the noise
floor causes SNR error that is intolerable. Using a
voltage divider method is another option and provides
some advantages when VREF needs to be very low or
when the desired output voltage is not available. In this
case, a larger value VREF is used while two resistors
scale the output range down to the precise desired
level.
Example 6-1 illustrates this concept. Note that the
bypass capacitor on the output of the voltage divider
plays a critical function in attenuating the output noise
of the DAC and the induced noise from the
environment.
EXAMPLE 6-1:
EXAMPLE CIRCUIT OF SET POINT OR THRESHOLD CALIBRATION
VDD
SPI
3-wire
VTRIP
R1
R2
0.1 uF
Comparator
G = Gain selection (1x or 2x)
Dn = Digital value of DAC (0-255) for MCP4901/MCP4902
VOUT
VREF G
Dn
2
N
------
=
VCC+
VCC–
VOUT
Vtrip
VOUT
R2
R1 R2
+
--------------------
=
VDD
RSENSE
DAC
= Digital value of DAC (0-1023) for MCP4911/MCP4912
= Digital value of DAC (0-4095) for MCP4921/MCP4922
N = DAC Bit Resolution
VREF
VO
MCP4901
MCP4911
MCP4921
(a) Single Output DAC:
(b) Dual Output DAC:
MCP4902
MCP4912
MCP4922
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