A 1 μF capacitor to VSS
參數(shù)資料
型號(hào)： EVAL-AD5272SDZ
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 17/28頁(yè)
文件大?。?/td> 0K
描述： BOARD EVAL FOR AD5272
標(biāo)準(zhǔn)包裝： 1
主要目的： 數(shù)字電位器
嵌入式： 否
已用 IC / 零件： AD5272
主要屬性： 1 通道，1024 位置
次要屬性： 2.7 ~ 5.5 V，5 ppm/°C，I²C
已供物品： 電路板，CD，器件，穩(wěn)壓器
AD5272/AD5274
Data Sheet
Rev. D | Page 24 of 28
EXT_CAP CAPACITOR
A 1 μF capacitor to VSS must be connected to the EXT_CAP pin
(see Figure 47) on power-up and throughout the operation of
the AD5272/AD5274.
AD5272/
AD5274
50_OTP
MEMORY
BLOCK
EXT_CAP
C1
1F
VSS
08
076
-00
9
Figure 47. EXT_CAP Hardware Setup
TERMINAL VOLTAGE OPERATING RANGE
The positive VDD and negative VSS power supplies of the
AD5272/AD5274 define the boundary conditions for proper
2-terminal digital resistor operation. Supply signals present on
Terminal A and Terminal W that exceed VDD or VSS are clamped
by the internal forward-biased diodes (see Figure 48).
VSS
VDD
A
W
08
076
-10
9
Figure 48. Maximum Terminal Voltages Set by VDD and VSS
The ground pins of the AD5272/AD5274 devices are primarily
used as digital ground references. To minimize the digital
ground bounce, join the AD5272/AD5274 ground terminal
remotely to the common ground. The digital input control
signals to the AD5272/AD5274 must be referenced to the
device ground pin (GND) and satisfy the logic level defined in
the Specifications section. An internal level shift circuit ensures
that the common-mode voltage range of the three terminals
extends from VSS to VDD, regardless of the digital input level.
POWER-UP SEQUENCE
Because there are diodes to limit the voltage compliance at
Terminal A and Terminal W (see Figure 48), it is important to
power VDD/VSS first before applying any voltage to Terminal A
and Terminal W; otherwise, the diode is forward-biased such
that VDD/VSS are powered unintentionally. The ideal power-up
sequence is VSS, GND, VDD, digital inputs, VA, and VW. The
order of powering VA, VW, and digital inputs is not important
as long as they are powered after VDD/VSS.
As soon as VDD is powered, the power-on preset activates, which
first sets the RDAC to midscale and then restores the last
programmed 50-TP value to the RDAC register.
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