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DAC5687MPZPEP bảng dữ liệu(PDF) 54 Page - Texas Instruments

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tên linh kiện DAC5687MPZPEP
Giải thích chi tiết về linh kiện  16-BIT 500-MSPS 2쨈??쨈 INTERPOLATING DUAL-CHANNEL DIGITAL-TO-ANALOG CONVERTER (DAC)
PDF  75 Pages
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nhà sản xuất  TI1 [Texas Instruments]
Trang chủ  http://www.ti.com
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DAC5687MPZPEP bảng dữ liệu(HTML) 54 Page - Texas Instruments

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Digital Inputs
DA[15:0]
DB[15:0]
SLEEP
PHSTR
TxENABLE
QFLAG
SDIO
SCLK
SDENB
Internal
Digital In
IOVDD
IOGND
RESETB
Internal
Digital In
IOVDD
IOGND
Clock Inputs
CLK
Internal
Digital In
CLKC
CLKGND
R1
10 k
Ω
CLKVDD
R1
10 k
Ω
R2
10 k
Ω
R2
10 k
Ω
CLKVDD
CLKVDD
S0028-01
DAC5687-EP
SGLS333 – JUNE 2006
QOUT(t) = (IIN(t)sin(2π× 0 × t + π/4) + 0 × cos(2π× 0 × t + π/4)) × 2
(1 – 1) = I
IN(t)sin(π/4) = IIN(t)/2
½
Applying the QMC gain of 1446, equivalent to 2½, increases the signal back to unity gain through the FMIX and
the QMC blocks.
Note that with this termination, the DAC side of the transformer is not 50-
Ω terminated and, therefore, may result
in reflections when used with a cable output.
Figure 61 shows a schematic of the equivalent CMOS digital inputs of the DAC5687. DA[0..15], DB[0..15],
SLEEP, PHSTR, TXENABLE, QFLAG, SDIO, SCLK, and SDENB have pulldown resistors and RESETB has a
pullup resistor internal to the DAC5687. See the specification table for logic thresholds.
Figure 61. CMOS/TTL Digital Equivalent Input
Figure 62 shows an equivalent circuit for the clock input.
Figure 62. Clock Input Equivalent Circuit
Figure 63, Figure 64, and Figure 65 show various input configurations for driving the differential clock input
(CLK/CLKC).
54
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