參數(shù)資料
型號(hào)： AD9786BSVZRL
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 26/56頁(yè)
文件大?。?/td> 0K
描述： IC DAC 16BIT INTERPOL/SP 80TQFP
產(chǎn)品培訓(xùn)模塊： Data Converter Fundamentals
DAC Architectures
標(biāo)準(zhǔn)包裝： 1,000
系列： TxDAC+®
位數(shù)： 16
數(shù)據(jù)接口： 并聯(lián)
轉(zhuǎn)換器數(shù)目： 1
電壓電源： 單電源
功率耗散（最大）： 1.25W
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 80-TQFP 裸露焊盤
供應(yīng)商設(shè)備封裝： 80-TQFP-EP（12x12）
包裝： 帶卷 (TR)
輸出數(shù)目和類型： 2 電流，單極
采樣率（每秒）： 500M
AD9786
Rev. B | Page 32 of 56
REAL AND COMPLEX SIGNALS
A complex signal contains both magnitude and phase
information. Given two signals at the same frequency, if the
leading signal in phase is cosinusoidal and the lagging signal is
sinusoidal, information pertaining to the magnitude and phase of
a combination of the two signals can be derived; the combination
of the two signals can be considered a complex signal. The cosine
and sine can be represented as a series of exponentials, recalling
that a multiplication by j is a counterclockwise rotation about
the Re/Im plane. The phasor representation of a complex signal
with Frequency f is shown in Figure 58.
Im
Re
C
Re
Im
A/2
FREQUENCY
0
+f
–f
A
2
πft
C = Ae2πft = Acos(2
πft) + jAsin(2πft)
Acos(2
πft) = A
=
[e+j2πft + e–j2πft]
e+j2πft + e–j2πft
2
A
2
Asin(2
πft) = A
=
[je+j2πft + e–j2πft]
e+j2πft + e–j2πft
2j
A
2
03152-058
Figure 58. Complex Phasor Representation
The cosine term—referred to as the real in-phase, or I component,
of a complex signal—represents a signal on the real plane with
mirror symmetry about dc. The sine term—referred to as the
imaginary quadrature, or Q complex signal component—
represents a signal on the imaginary plane with mirror
asymmetry about dc.
The AD9786 has two channels of interpolation filters, allowing
both I and Q components to be shaped by the same filter transfer
function. The interpolation filter’s frequency response is a real
transfer function. Two DACs are required to represent a complex
signal. A single DAC can only synthesize a real signal. When a
DAC synthesizes a real signal, negative frequency components
fold onto the positive frequency axis. If the input to the DAC is
mirrored symmetrically about dc, the negative frequency
components fold directly onto the positive frequency compo-
nents in phase-producing, constructive signal summation. If
the input to the DAC is not mirrored symmetrically about dc,
negative frequency components might not be in phase with
positive frequency components, causing destructive signal
summation. Different applications might benefit from either
type of signal summation.
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