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參數(shù)資料
| 型號： | DAC8820IBDBG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | DAC |
| 英文描述： | PARALLEL, WORD INPUT LOADING, 0.5 us SETTLING TIME, 16-BIT DAC, PDSO28 |
| 封裝： | GREEN, PLASTIC, SSOP-28 |
| 文件頁數(shù)： | 4/22頁 |
| 文件大?。?/td> | 1216K |
| 代理商： | DAC8820IBDBG4 |
www.ti.com
TotalHarmonicDistortion(dB)
45
55
65
75
85
95
105
115
-
10
100
1000
10k 20k 30k
Frequency(Hz)
500kHzFilter
80kHzFilter
30kHzFilter
CodeFFFFh
V
=6V
REF
RMS
1
V
=+5V
DD
OneOPA627
C =20pF
THEORY OF OPERATION
R
I
OUT
GND
V
REF
2R
R
FB
V
OUT
+ *VREF
D
65536
(1)
SBAS358D – AUGUST 2005 – REVISED FEBRUARY 2008
TYPICAL CHARACTERISTICS (continued)
At TA = +25°C, unless otherwise noted.
UNIPOLAR MULTIPLYING MODE THD
vs FREQUENCY
Figure 37.
The DAC8820 is a multiplying, single-channel current output, 16-bit DAC. The architecture, illustrated in
Figure 38, is an R-2R ladder configuration with the three MSBs segmented. Each 2R leg of the ladder is either
switched to GND or to the IOUT terminal. The IOUT terminal of the DAC is held at a virtual GND potential by the
use of an external I/V converter op amp. The R-2R ladder is connected to an external reference input (VREF) that
determines the DAC full-scale current. The R-2R ladder presents a code independent load impedance to the
external reference of 6 k
±25%. The external reference voltage can vary in a range of –15 V to +15 V, thus
providing bipolar IOUT current operation. By using an external I/V converter op amp and the RFB resistor in the
DAC8820, an output voltage range of –VREF to +VREF can be generated.
Figure 38. Equivalent R-2R DAC Circuit
Each DAC code determines the 2R-leg switch position to either GND or IOUT. The external I/V converter op amp
noise gain will also change because the DAC output impedance (as seen looking into the IOUT terminal) changes
versus code. Because of this, the external I/V converter op amp must have a sufficiently low offset voltage such
that the amplifier offset is not modulated by the DAC IOUT terminal impedance change. External op amps with
large offset voltages can produce INL errors in the transfer function of the DAC8820 because of offset
modulation versus DAC code. For best linearity performance of the DAC8820, an op amp (OPA277) is
12
Copyright 2005–2008, Texas Instruments Incorporated
Product Folder Link(s): DAC8820
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| DAC8820IBDBR | 功能描述:數(shù)模轉(zhuǎn)換器- DAC 16-Bit Parallel Inp 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(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube |
| DAC8820IBDBRG4 | 功能描述:數(shù)模轉(zhuǎn)換器- DAC 16-Bit Parallel Inp 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(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube |
| DAC8820IC | 制造商:TI 制造商全稱:Texas Instruments 功能描述:16-Bit, Parallel Input Multiplying Digital-to-Analog Converter |
| DAC8820ICDB | 功能描述:數(shù)模轉(zhuǎn)換器- DAC 16-Bit Parallel Inp 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(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube |
| DAC8820ICDBG4 | 功能描述:數(shù)模轉(zhuǎn)換器- DAC 16-Bit Parallel Inp 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(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube |
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