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參數(shù)資料
| 型號(hào)： | DAC1220E |
| 英文描述： | 20-Bit Low Power DIGITAL-TO-ANALOG CONVERTER |
| 中文描述： | 20位低功耗數(shù)字到模擬轉(zhuǎn)換器 |
| 文件頁(yè)數(shù)： | 9/14頁(yè) |
| 文件大?。?/td> | 123K |
| 代理商： | DAC1220E |
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9
Data Input Register (DIR)
The DIR is a 24-bit register which contains the digital input
value (see Table VIII). The register is latched on the falling
edge of the last bit of the last byte sent. The contents of the
DIR are then loaded into the modulator. This means that the
DIR register can be updated after sending 1, 2, or 3 bytes,
which is determined by the MB1 and MB0 bits in the
Instruction Register. The contents of the DIR can be Offset
Two’s Complement or Straight Binary.
Offset Calibration Register (OCR)
The OCR is a 24-bit register containing the offset correction
factor that is used to apply a correction to the digital input
before it is transferred to the modulator. The results of the
self-calibration process will be written to this register.
The OCR is both readable and writable via the serial inter-
face. For applications requiring a more accurate calibration,
a calibration can be performed, the results averaged, and a
more precise offset calibration value written back to the
OCR.
The actual OCR value after calibration will change from part
to part and with
configuration, temperature, and power supply.
In addition, be aware that the contents of the OCR are not
used to directly correct the digital input. Rather, the correc-
tion is a function of the OCR value. This function is linear
and two known points can be used as a basis for interpolat-
ing intermediate values for the OCR.
The results of calibration are averaged, Offset Two's Comple-
ment adjusted, and placed in the OCR.
MSB (Bit Order) Bit—
The MSB bit controls the order in
which bits within a byte of data are read or written (either
most significant bit first or least significant bit first) as
follows:
MD1 - MD0 (Operating Mode) Bits—
The Operating Mode
bits control the calibration functions of the DAC1220. The
Normal mode is used to perform conversions. The Self-
Calibration mode is a one-step calibration sequence that
calibrates both the offset and full scale.
MSB
Byte 2
OCR23
OCR22
OCR21
OCR20
OCR19
OCR18
OCR17
OCR16
Byte 1
OCR15
OCR14
OCR13
OCR12
OCR11
OCR10
OCR9
OCR8
Byte 0
LSB
OCR7
OCR6
OCR5
OCR4
OCR3
OCR2
OCR1
OCR0
TABLE VI. Offset Calibration Register.
MSB
Byte 2
FCR23
FCR22
FCR21
FCR20
FCR19
FCR18
FCR17
FCR16
Byte 1
FCR15
FCR14
FCR13
FCR12
FCR11
FCR10
FCR9
FCR8
Byte 0
LSB
FCR7
FCR6
FCR5
FCR4
FCR3
FCR2
FCR1
FCR0
TABLE VII. Full-Scale Calibration Register.
MSB
Byte 2
DIR23
DIR22
DIR21
DIR20
DIR19
DIR18
DIR17
DIR16
Byte 1
DIR15
DIR14
DIR13
DIR12
DIR11
DIR10
DIR9
DIR8
Byte 0
LSB
DIR7
DIR6
DIR5
DIR4
DIR3
DIR2
DIR1
DIR0
TABLE VIII. Data Input Register.
Full-Scale Calibration Register (FCR)
The FCR is a 24-bit register which contains the full-scale
correction factor that is applied to the digital input before it
is transferred to the modulator.
The contents of this register
will be the result of a self-calibration, or written to by the
user.
The FCR is both readable and writable via the serial inter-
face. For applications requiring an accurate system calibra-
tion, a system calibration can be performed, the results
averaged, and a more precise value written back to the FCR.
The actual FCR value after calibration will change from part
to part and with configuration, temperature, and power
supply.
In addition, be aware that the contents of the FCR are not
used to directly correct the digital input. Rather, the correc-
tion is a function of the FCR value. This function is linear
and two known points can be used as a basis for interpolat-
ing intermediate values for the FCR. The contents of the
FCR are in unsigned binary format. This is not affected by
the DF bit in the Command register.
MSB
0
1
MSB-First
LSB-First
Default
MD1
MD0
0
0
1
1
0
1
0
1
Normal Mode
Self-Cal
Sleep
X
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DAC1220E | 制造商:BURR-BROWN 功能描述:IC 20BIT DAC SMD 1220 SSOP16 |
| DAC1220E | 制造商:Texas Instruments 功能描述:D/A Converter (D-A) IC 制造商:Texas Instruments 功能描述:IC, DAC, 20BIT, 0.5KSPS, QSOP-16 |
| DAC1220E | 制造商:Texas Instruments 功能描述:IC 20-BIT MONOLITHIC D/A 16-QSOP |
| DAC1220E/250 | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:D/A CONVERTER |
| DAC1220E/2K5 | 功能描述:數(shù)模轉(zhuǎn)換器- DAC 20-Bit Low Power RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換器數(shù)量:1 DAC 輸出端數(shù)量:1 轉(zhuǎn)換速率:2 MSPs 分辨率:16 bit 接口類(lèi)型:QSPI, SPI, Serial (3-Wire, Microwire) 穩(wěn)定時(shí)間:1 us 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube |
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