MAX5429 Maxim Integrated Products, MAX5429 Datasheet - Page 7

• Manufacturer Part Number: MAX5429
• Description: (MAX5427 - MAX5429) Linear-Taper Digital Potentiometers
• Manufacturer: Maxim Integrated Products

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It is recommended that the user either use six CS puls-
es (convert to a fixed voltage-divider) or five pulses
(program the initial power-up value of the device, but
still be able to adjust the wiper). If the device is pro-
grammed with five pulses and later it is desired to dis-
able the interface (convert to a fixed voltage-divider),
then care must be taken to ensure that the wiper is in
the same position as it was originally set to (when pro-
grammed with five pulses). The full six programming
pulses must be applied. If the wiper is not in its original
programmed position prior to disabling the interface,
the final locked-out position is correct. Note that once
the six-pulse program occurs, no further programming
is possible.
The V
5mA and have a good transient response. The V
supply should be decoupled with 22µF and have no more
than 250µH of inductance and/or 40
tance between the capacitors and the device (Figure 5).
The device does not require decoupling capacitors near
V
Figure 4. One-Time Program Mode Serial Interface Timing Diagram
PP
, provided the above guidelines are met.
PP
V
PP
U/D
11V
power supply must be able to source at least
CS
0V
_______________________________________________________________________________________
One-Time Programmable, Linear-Taper
t
PC
t
CH
of parasitic resis-
5 BITS RECORD WIPER POSITION
PP
power
t
CL
Figure 5. V
TRANSISTOR COUNT: 2270
PROCESS: BiCMOS
Digital Potentiometers
V
PP
= 11V
22 F
PP
Power-Supply Connection
L
< 250 H
PARASITIC
TRACE PARASITICS
OPTIONAL LOCKOUT BIT
Chip Information
R
PARASITIC
< 40
t
CP
t
PH
V
PP
MAX5427
MAX5428
MAX5429
7
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