參數(shù)資料
型號(hào)： AD5172
廠商： Analog Devices, Inc.
英文描述： 0.0022 UF 20% 250VAC Y5U RAD DISC CAP
中文描述： 256位一次性可編程雙通道I2C數(shù)字電位器
文件頁(yè)數(shù)： 15/24頁(yè)
文件大小： 948K
代理商： AD5172
AD5172/AD5173
Rev. A | Page 15 of 24
V
DD
2.7V
6V
P1
P1=P2=FDV302P, NDS0610
R1
10k
P2
C1
1
μ
F
C2
1nF
APPLY FOR OTP ONLY
AD5172/
AD5173
0
Poor PCB layout introduces parasitics that may affect the fuse
programming. Therefore, it is recommended to add a 1 μF
tantalum capacitor in parallel with a 1 nF ceramic capacitor as
close as possible to the V
DD
pin. These capacitors help ensure
OTP programming success by providing proper current densi-
ties. This combination of capacitor values provides both a fast
response for high frequency transients and a larger supply of
current for extended spikes. Typically, C1
minimizes any
transient disturbances and low frequency ripple, while C2
reduces high frequency noise.
Figure 44. Isolate 6 V OTP Supply from 2.7 V Normal Operating Supply.
The 6 V supply must be removed once OTP is completed.
LAYOUT CONSIDERATIONS
It is a good practice to employ compact, minimum lead length
layout design. The leads to the inputs should be as direct as
possible with a minimum conductor length. Ground paths
should have low resistance and low inductance.
For users who operate their systems at 2.7 V, use of the
bidirectional low threshold P-Ch MOSFETs is recommended
for the supply’s isolation. As shown in Figure 44, this assumes
that the 2.7 V system voltage is applied first, and that the P1 and
P2 gates are pulled to ground, thus turning on P1 and
subsequently P2. As a result, V
DD
of the AD5172/AD5173
approaches 2.7 V. When the AD5172/AD5173 setting is found,
the factory tester applies the 6 V to V
DD
; the 6 V is also applied
to the gates of P1 and P2 to turn them off. The OTP command
is executed at this time to program the AD5172/AD5173; the
2.7 V source is therefore protected. Once the OTP is completed,
the tester withdraws the 6 V and the AD5172/AD5173’s setting
is fixed permanently.
Note that the digital ground should also be joined remotely to
the analog ground at one point to minimize the ground bounce.
V
DD
GND
V
DD
C1
1
μ
F
C2
1nF
AD5172
+
0
AD5172/AD5173 achieves the OTP function through blowing
internal fuses. Users should always apply the 6 V one-time
program voltage requirement at the first program command.
Failure to comply with this requirement may lead to the change
of fuse structures, rendering programming inoperable.
Figure 45. Power Supply Bypassing
相關(guān)PDF資料
PDF描述
AD5172BRM10 Dual, 256-Tap, Nonvolatile, I2C-Interface, Digital Potentiometers
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AD5172BRM100-RL7 制造商:Analog Devices 功能描述:Digital Potentiometer 256POS 100KOhm Dual 10-Pin MSOP T/R 制造商:Analog Devices 功能描述:DGTL POTENTIOMETER 256POS 100KOHM DUAL 10MSOP - Tape and Reel
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