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OMAP3530ECBBA 数据表(PDF) 153 Page - Texas Instruments

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部件名 OMAP3530ECBBA
功能描述  OMAP3530 and OMAP3525 Applications Processors
PDF  265 Pages
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制造商  TI1 [Texas Instruments]
网页  http://www.ti.com
标志 TI1 - Texas Instruments

OMAP3530ECBBA 数据表(HTML) 153 Page - Texas Instruments

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OMAP3530, OMAP3525
www.ti.com
SPRS507H – FEBRUARY 2008 – REVISED OCTOBER 2013
Because the DAC PSRR deteriorates at a rate of 20 dB/dec after 100 kHz, it is highly recommended to
have vdda_dac low pass filtered (proper decoupling) (see the illustrated application: Section 5.4, External
Component Value Choice).
5.4
External Component Value Choice
The full-scale output voltage VOUTMAX is regulated by the reference amplifier, and is set by an internal
resistor RSET. IOUTMAX can be expressed as:
IOUTMAX = IREF /8 * (63 + 15/16)
(1)
Where:
VREF = 0.55V
(2)
IREF = VREF/ (2* RSET)
(3)
The output current IOUT appearing at DAC output is a function of both the input code and IOUTMAX and can
be expressed as:
IOUT = (DAC_CODE/1023) * IOUTMAX
(4)
Where:
DAC_CODE = 0 to 1023 is the DAC input code in decimal.
(5)
The output voltage is:
VOUT = IOUT *N* RCABLE
(6)
Where:
(N = amplifier gain = 21)
(7)
RCABLE = 75 Ω (cable typical impedance)
(8)
The TV-out buffer requires a per channel external resistors: ROUT1/2. The equation below can be used to
select different resistor values (if necessary):
ROUT = (N+1) RCABLE = 1650 Ω
(9)
Recommended parameter values are:
Table 5-7. Video DAC – Recommended External Components Values
Recommended Value
UNIT
CBG
100
nF
ROUT1/2
1650
Ω
In order to limit the reference noise bandwidth and to suppress transients on VREF, it is necessary to
connect a large decoupling capacitor ©BG) between the tv_vref and vssa_dac pins.
Copyright © 2008–2013, Texas Instruments Incorporated
VIDEO DAC SPECIFICATIONS
153
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Product Folder Links: OMAP3530 OMAP3525



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