- 您現在的位置：買賣IC網 > PDF目錄9044 > MCP4725A2T-E/CH (Microchip Technology)IC DAC 12BIT EE W/I2C SOT23-6 PDF資料下載
參數資料
| 型號： | MCP4725A2T-E/CH |
| 廠商： | Microchip Technology |
| 文件頁數： | 11/50頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC DAC 12BIT EE W/I2C SOT23-6 |
| 標準包裝： | 1 |
| 設置時間： | 6µs |
| 位數： | 12 |
| 數據接口： | EEPROM，I²C，串行 |
| 轉換器數目： | 1 |
| 電壓電源： | 單電源 |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | SOT-23-6 |
| 供應商設備封裝： | SOT-23-6 |
| 包裝： | 標準包裝 |
| 輸出數目和類型： | 1 電壓，單極；1 電壓，雙極 |
| 采樣率（每秒）： | * |
| 產品目錄頁面： | 673 (CN2011-ZH PDF) |
| 配用： | MCP4725DM-PTPLS-ND - BOARD DAUGHTER PICTAIL MCP4725 |
| 其它名稱： | MCP4725A2T-E/CHDKR |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁當前第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁
2009 Microchip Technology Inc.
DS22039D-page 19
MCP4725
5.0
GENERAL DESCRIPTION
The MCP4725 is a single channel buffered voltage
output
12-bit
DAC
with
non-volatile
memory
(EEPROM). The user can store configuration register
bits (2 bits) and DAC input data (12 bits) in non-volatile
EEPROM (14 bits) memory.
When the device is powered on first, it loads the DAC
code from the EEPROM and outputs the analog output
accordingly with the programmed settings. The user
can reprogram the EEPROM or DAC register any time.
The device uses a resistor string architecture. DAC’s
output is buffered with a low power precision amplifier.
This output amplifier provides low offset voltage and
low noise, as well as rail-to-rail output. The amplifier
can also provide high source currents (VOUT pin to
VSS).
The DAC can be configured to normal or power saving
power-down mode by setting the configuration register
bits.
The device uses a two-wire I2C compatible serial
interface and operates from a single power supply
ranging from 2.7V to 5.5V.
5.1
Output Voltage
The input coding to the MCP4725 device is unsigned
binary. The output voltage range is from 0V to VDD. The
output voltage is given in Equation 5-1:
EQUATION 5-1:
5.1.1
OUTPUT AMPLIFIER
The DAC output is buffered with a low-power, precision
CMOS amplifier. This amplifier provides low offset
voltage and low noise. The output stage enables the
device to operate with output voltages close to the
power supply rails. Refer to Section 1.0 “Electrical
Characteristics” for range and load conditions.
The output amplifier can drive the resistive and high
capacitive loads without oscillation. The amplifier can
provide maximum load current as high as 25 mA which
is enough for most of a programmable voltage
reference applications.
5.1.2
DRIVING RESISTIVE AND
CAPACITIVE LOADS
The MCP4725 output stage is capable of driving loads
up to 1000 pF in parallel with 5 k load resistance.
drops slowly as the load resistance decreases after
about 3.5 k.
5.2
LSB SIZE
One LSB is defined as the ideal voltage difference
between two successive codes. (see Equation 4-1).
Table 5-1 shows an example of the LSB size over full
scale range (VDD).
TABLE 5-1:
LSB SIZES FOR MCP4725
(EXAMPLE)
5.3
Voltage Reference
The MCP4725 device uses the VDD as its voltage
reference. Any variation or noises on the VDD line can
affect directly on the DAC output. The VDD needs to be
as clean as possible for accurate DAC performance.
5.4
Reset Conditions
In the Reset conditions, the device uploads the
EEPROM data into the DAC register. The device can
be reset by two independent events: (a) by POR or (b)
by I2C General Call Reset Command.
The factory default settings for the EEPROM prior to
shipment are shown in Table 5-3 (set for a middle scale
output). The user can rewrite or read the DAC register
or EEPROM anytime after the Power-On-Reset event.
5.4.1
POWER-ON-RESET
The device’s internal Power-On-Reset (POR) circuit
ensures that the device powers up in a defined state.
If the power supply voltage is less than the POR thresh-
old (VPOR = 2V, typical), all circuits are disabled and
there will be no DAC output. When the VDD increases
above the VPOR, the device takes a reset state. During
the reset period, the device uploads all configuration
and DAC input codes from EEPROM. The DAC output
will be the same as for the value last stored in the
EEPROM. This enables the device returns to the same
state that it was at the last write to the EEPROM before
it was powered off.
V
OUT
V
REF
D
n
×
()
4096
-------------------------------
=
Where:
VREF
=VDD
Dn
=
Input code
Full Scale
Range
(VDD)
LSB
Size
Condition
3.0V
0.73 mV
3V / 4096
5.0V
1.22 mV
5V / 4096
相關PDF資料 |
PDF描述 |
|---|---|
| IDT23S09E-1HPGG8 | IC CLK BUFFER ZD HI DRV 16-TSSOP |
| VI-BTH-MY-F3 | CONVERTER MOD DC/DC 52V 50W |
| MCP4725A1T-E/CH | IC DAC 12BIT EE W/I2C SOT23-6 |
| M83723/95A1404N | CONN PLUG 4POS STRAIGHT W/SCKT |
| VI-BTH-MY-F1 | CONVERTER MOD DC/DC 52V 50W |
相關代理商/技術參數 |
參數描述 |
|---|---|
| MCP4725A3T-E/CH | 功能描述:數模轉換器- DAC Sngl 12-B NV DAC w/ I2C interface RoHS:否 制造商:Texas Instruments 轉換器數量:1 DAC 輸出端數量:1 轉換速率:2 MSPs 分辨率:16 bit 接口類型:QSPI, SPI, Serial (3-Wire, Microwire) 穩(wěn)定時間:1 us 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube |
| MCP4725A3T-E/CH-CUT TAPE | 制造商:Microchip 功能描述:MCP4725 Series 1 Ch I2C EEPROM Memory 5.5 V 12-Bit D/A Converter SMT - SOT-23-6 |
| MCP4725DM-PTPLS | 功能描述:子卡和OEM板 MCP4725 DAC PICTail Plus Daughter Board RoHS:否 制造商:BeagleBoard by CircuitCo 產品:BeagleBone LCD4 Boards 用于:BeagleBone - BB-Bone - Open Source Development Kit |
| MCP4725EV | 功能描述:數據轉換 IC 開發(fā)工具 MCP4725 Eval Brd RoHS:否 制造商:Texas Instruments 產品:Demonstration Kits 類型:ADC 工具用于評估:ADS130E08 接口類型:SPI 工作電源電壓:- 6 V to + 6 V |
| MCP4725T-E/CH | 功能描述:數模轉換器- DAC SNGL 12B NV DAC with I2C interface RoHS:否 制造商:Texas Instruments 轉換器數量:1 DAC 輸出端數量:1 轉換速率:2 MSPs 分辨率:16 bit 接口類型:QSPI, SPI, Serial (3-Wire, Microwire) 穩(wěn)定時間:1 us 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube |
發(fā)布緊急采購，3分鐘左右您將得到回復。