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参数资料
型号： DAC5687IPZP
厂商： TEXAS INSTRUMENTS INC
元件分类： DAC
英文描述： PARALLEL, WORD INPUT LOADING, 0.0104 us SETTLING TIME, 16-BIT DAC, PQFP100
封装： GREEN, PLASTIC, HTQFP-100
文件页数： 58/79页
文件大小： 2490K
代理商： DAC5687IPZP
www.ti.com
(a) Complex Output in X4 and X4L Modes
(b) Real Output in X4 and X4L Modes
fSIG/fDAC
0.5
0.4
0.3
0.2
0.1
0.0
0.1
0.2
0.3
0.4
0.5
0.0
0.1
0.2
0.3
0.4
0.5
Spurious
Frequency/f
D
A
C
G028
fSIG fDAC*3/4
fSIG fDAC/2
fSIG fDAC/4
fSIG + fDAC/4
fSIG
fSIG/fDAC
0.00
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40
0.45
0.50
0.0
0.1
0.2
0.3
0.4
0.5
Spurious
Frequency/f
D
A
C
G029
fSIG + fDAC/4
fSIG fDAC*3/4
fSIG fDAC/4
fSIG
fSIG fDAC/2
(a) Complex Output in X8 Mode
(b) Real Output in X8 Mode
fSIG/fDAC
0.5
0.4
0.3
0.2
0.1
0.0
0.1
0.2
0.3
0.4
0.5
0.0
0.1
0.2
0.3
0.4
0.5
Spurious
Frequency/f
D
A
C
G030
fSIG + fDAC/4
fSIG fDAC*3/4
fSIG fDAC/4
fSIG fDAC/2
fSIG fDAC*7/8
fSIG
fSIG fDAC/8
fSIG + fDAC/8
fSIG/fDAC
0.00
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40
0.45
0.50
0.0
0.1
0.2
0.3
0.4
0.5
Spurious
Frequency/f
D
A
C
G031
fSIG fDAC/4
fSIG fDAC*7/8
fSIG fDAC/2
fSIG + fDAC/4
fSIG + fDAC/8
fSIG
fSIG fDAC/8
fSIG fDAC*3/4
Amplitude of the Spurious Signals
DAC5687
SLWS164E – FEBRUARY 2005 – REVISED SEPTEMBER 2006
Figure 71. Frequency of Clock Mixing Spurious Images in X4 and X4L Modes
Figure 72 shows the location of spurious signals for X8 mode as a function of fSIG/fDAC. The addition of the fDAC/8
clock frequency for the first interpolation filter creates four new spurious signals. For a complex output, the
nearest spurious signals are fDAC/8 offset from fSIG. For a real output, the optimum real output frequencies fSIG =
fDAC × N/16 (N = 3 and 5), where the minimum spurious product offset from fSIG is fDAC/8.
Figure 72. Frequency of Clock Mixing Spurious Images in X8 Mode
The spurious signal amplitude is sensitive to factors such as temperature, voltage, and process. The following
typical worst-case estimates to account for the variation over these factors are provided as design guidelines.
Copyright 2005–2006, Texas Instruments Incorporated
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Product Folder Link(s): DAC5687
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