VCC and IOV
參數(shù)資料
型號(hào)： EVAL-AD5700-1EBZ
廠(chǎng)商： Analog Devices Inc
文件頁(yè)數(shù)： 4/24頁(yè)
文件大小： 0K
描述： BOARD EVAL HART MODEM AD5700
標(biāo)準(zhǔn)包裝： 1
主要目的： 電信，調(diào)制解調(diào)器
嵌入式： 否
已用 IC / 零件： AD5700
主要屬性： HART? FSK 半雙工調(diào)制解調(diào)器
已供物品： 板
AD5700/AD5700-1
Data Sheet
Rev. F | Page 12 of 24
TERMINOLOGY
VCC and IOVCC Current Consumption
This specification gives a summation of the current consump-
tion of both the VCC and the IOVCC supplies. Figure 11 shows
separate measurements for VCC and IOVCC currents vs. varying
capacitive loads, in transmit mode.
Load Regulation
Load regulation is the change in reference output voltage due to
a specified change in load current. It is expressed in ppm/A.
CD Assert
The minimum value at which the carrier detect signal asserts is
85 mV p-p and the maximum value it asserts at is 110 mV p-p. CD
is already high (asserted) for HART input signals greater than
110 mV p-p. This specification was set assuming a sinusoidal
input signal containing preamble characters at the input and an
ideal external filter (see Figure 23).
HART_OUT Output Voltage
This is the peak-to-peak HART_OUT output voltage. The
specification in Table 2 was set using a worst-case load of 160 ,
ac-coupled with a 2.2 F capacitor. Figure 17 and Figure 18 show
HART_OUT output voltages for both resistive and purely
capacitive loads.
Mark/Space Frequency
A 1.2 kHz signal represents a digital 1, or mark, whereas a
2.2 kHz signal represents a 0, or space.
Phase Continuity Error
The DDS engine in this design inherently generates continuous
phase signals, thus avoiding any output discontinuity when
switching between frequencies. This attribute is desirable for
signals that are to be transmitted over a band limited channel,
because discontinuities in a signal introduce wideband fre-
quency components. As the name suggests, for a signal to be
continuous, the phase continuity error must be 0o.
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