參數(shù)資料
型號(hào)： DAC8820IB
廠商： Texas Instruments, Inc.
英文描述： 16-Bit, Parallel Input Multiplying Digital-to-Analog Converter
中文描述： 16位并行輸入乘法數(shù)字到模擬轉(zhuǎn)換器
文件頁(yè)數(shù)： 14/22頁(yè)
文件大?。?/td> 939K
代理商： DAC8820IB
www.ti.com
APPLICATION INFORMATION
Multiplying Mode THD vs Frequency
Figure 35
and
Figure 36
show the DAC8820 bipolar 4-quadrant multiplying mode total harmonic distortion (THD)
versus frequency.
Figure 35
shows the bipolar multiplying mode THD with the DAC8820 set to a full-scale code
of FFFFh.
Figure 36
shows the bipolar multiplying mode THD with the DAC8820 set to a minus full scale code of
0000h. In both graphs, two OPA627s are used for both the DAC output op amp and the reference inverting
amplifier. A 6V
RMS
sine wave is used for the reference input V
REF
and is swept in frequency from 10 Hz to 30
kHz. The THD levels versus frequency are illustrated at various DAC output filtering levels using an external
ac-coupled low-pass filter.
Stability Circuit
For a current-to-voltage (I/V) design, as shown in
Figure 41
, the DAC8820 current output (I
OUT
) and the
connection with the inverting node of the op amp should be as short as possible and laid out according to
correct printed circuit board (PCB) layout design. For each code change there is a step function. If the gain
bandwidth product (GBP) of the op amp is limited and parasitic capacitance is excessive at the inverting node,
then gain peaking is possible. Therefore, a compensation capacitor C1 (4 pF to 20 pF, typ) can be added to the
design for circuit stability, as shown in
Figure 41
.
DAC8820
OPA277
V
DD
V
DD
U2
GND
R
OFS
R
FB
V
OUT
I
OUT
V
REF
V
REF
U1
C1
Bipolar Output Circuit
The DAC8820, as a 4-quadrant multiplying DAC, can be used to generate a bipolar output. The polarity of the
full-scale output (I
OUT
) is the inverse of the input reference voltage at V
REF
.
Using a dual op amp, such as the OPA2277, full 4-quadrant operation can be achieved with minimal
components.
Figure 42
demonstrates a
±
10 V
OUT
circuit with a fixed +10 V reference.
DAC8820
SBAS358C–AUGUST 2005–REVISED JUNE 2006
Figure 37
illustrates the DAC8820 unipolar 2-quadrant multiplying mode THD vs. frequency. The DAC8820 is set
to a full-scale code of FFFFh. A single OPA627 is used for the DAC output op amp.
Figure 41. Gain Peaking Prevention Circuit with Compensation Capacitor
14
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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(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
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
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