VREF+ V
參數(shù)資料
型號(hào)： AD7849BR
廠(chǎng)商： Analog Devices Inc
文件頁(yè)數(shù)： 18/20頁(yè)
文件大?。?/td> 0K
描述： IC DAC 14/16BIT SRL-IN 20-SOIC
產(chǎn)品培訓(xùn)模塊： Data Converter Fundamentals
DAC Architectures
標(biāo)準(zhǔn)包裝： 37
設(shè)置時(shí)間： 7µs
位數(shù)： 16
數(shù)據(jù)接口： 串行
轉(zhuǎn)換器數(shù)目： 1
電壓電源： 模擬和數(shù)字，雙 ±
功率耗散（最大）： 100mW
工作溫度： -40°C ~ 85°C
安裝類(lèi)型： 表面貼裝
封裝/外殼： 20-SOIC（0.295"，7.50mm 寬）
供應(yīng)商設(shè)備封裝： 20-SOIC W
包裝： 管件
輸出數(shù)目和類(lèi)型： 1 電壓，單極；1 電壓，雙極
采樣率（每秒）： 143k
AD7849
Rev. C | Page 7 of 20
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
VREF+
VDD
NC
VOUT
ROFS
VREF–
VSS
SYNC
RSTIN
RSTOUT
AGND
SCLK
VCC
SDOUT
DCEN
BIN/COMP
DGND
LDAC
SDIN
CLR
1
2
3
4
20
19
18
17
5
16
6
15
7
14
8
13
9
12
10
11
NC = NO CONNECT. DO NOT CONNECT TO THIS PIN.
AD7849
TOP VIEW
(Not to Scale)
010
08-
003
Figure 2. Pin Configuration
Table 6. Pin Function Descriptions
Pin No.
Mnemonic
Description
1
VREF+
VREF+ Input. The DAC is specified for VREF+ of 5 V. The DAC is fully multiplying so that the VREF+ range is +5 V to –5 V.
2
VREF
VREF Input. The DAC is specified for VREF of –5 V. The DAC is fully multiplying so that the VREF range is –5 V to +5 V.
3
VSS
Negative supply for the analog circuitry. This is nominally –15 V.
4
SYNC
Data Synchronization Logic Input. When it goes low, the internal logic is initialized in readiness for a new data-word.
5
SCLK
Serial Clock Logic Input. Data is clocked into the input register on each SCLK falling edge.
6
VCC
Positive supply for the digital circuitry. This is nominally 5 V.
7
SDOUT
Serial Data Output. With DCEN at Logic 1, this output is enabled, and the serial data in the input shift register is
clocked out on each rising edge of SCLK.
8
DCEN
Daisy-Chain Enable Logic Input. Connect this pin high if a daisy-chain interface is being used; otherwise, this
pin must be connected low.
9
BIN/COMP
Logic Input. This input selects the data format to be either binary or twos complement. In the unipolar output
range, natural binary format is selected by connecting the input to Logic 0. In the bipolar output range, offset
binary is selected by connecting this input to Logic 0, and twos complement is selected by connecting it to a
Logic 1.
10
DGND
Digital Ground. Ground reference point for the on-chip digital circuitry.
11
LDAC
Load DAC Logic Input. This input updates the DAC output. The DAC output is updated on the falling edge of
this signal, or alternatively, if this input is permanently low, an automatic update mode is selected where the
DAC is updated on the 16th falling SCLK edge.
12
SDIN
Serial Data Input. The 16-bit serial data-word is applied to this input.
13
CLR
Clear Logic Input. Taking this input low sets VOUT to 0 V in both the unipolar output range and the bipolar twos
complement output range. It sets VOUT to VREF– in the offset binary bipolar output range.
14
RSTIN
Reset Logic Input. This input allows external access to the internal reset logic. Applying Logic 0 to this input,
resets the DAC output to 0 V. In normal operation, it should be tied to Logic 1.
15
RSTOUT
Reset Logic Output. This is the output from the on-chip voltage monitor used in the reset circuit. It can be used
to control other system components, if desired.
16
AGND
This is the analog ground for the device. It is the point to which the output gets shorted in reset mode.
17
VDD
Positive Supply for the Analog Circuitry. This is 15 V nominal.
18
NC
No Connect. Leave unconnected.
19
VOUT
DAC Output Voltage Pin.
20
ROFS
Input to Summing Resistor of DAC Output Amplifier. This is used to select the output voltage ranges. Also, see
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