MAX5428EUA Fast Delivery |IC PHOENIX CO.,LIMITED

MAX5428EUA ,32-Tap, One-Time Programmable, Linear-Taper Digital PotentiometersBlock DiagramCS L2 7V U/DDD 3 6 HMAX5427MAX54288MAX5429GND V4 5 PP3VDDS324MAX5427GNDR31μMAXMAX5428M ..
MAX542ACPD ,+5V, Serial-Input, Voltage-Output, 16-Bit DACsApplications MAX541BCSA 0°C to +70°C 8 SO ±2MAX541CCSA 0°C to +70°C 8 SO ±4High-Resolution Offset a ..
MAX542ACPD+ ,+5V, Serial-Input, Voltage-Output 16-Bit DACsMAX541/MAX54219-1082; Rev 2; 12/99+5V, Serial-Input, Voltage-Output, 16-Bit DACs
MAX542ACPD+ ,+5V, Serial-Input, Voltage-Output 16-Bit DACsFeaturesThe MAX541/MAX542 are serial-input, voltage-output, ♦ Full 16-Bit Performance Without Adjus ..
MAX542ACSD ,+5V, Serial-Input, Voltage-Output, 16-Bit DACsMAX541/MAX54219-1082; Rev 2; 12/99+5V, Serial-Input, Voltage-Output, 16-Bit DACs
MAX542AEPD+ ,+5V, Serial-Input, Voltage-Output 16-Bit DACsELECTRICAL CHARACTERISTICS(V = +5V ±5%, V = +2.5V, AGND = DGND = 0, T = T to T , unless otherwise n ..
MAX9984ETP+T ,SiGe High-Linearity, 400MHz to 1000MHz Downconversion Mixer with LO Buffer/SwitchApplications850MHz W-CDMA Base StationsOrdering InformationGSM 850/GSM 900 2G and 2.5G EDGE Base St ..
MAX9985ETX , Dual, SiGe, High-Linearity, 700MHz to 1000MHz Downconversion Mixer with LO Buffer/Switch
MAX9985ETX+ ,Dual, SiGe, High-Linearity, 700MHz to 1000MHz Downconversion Mixer with LO Buffer/SwitchApplicationsdifferential IF output amplifiers. In addition, integrated♦ 47dB Typical Channel-to-Cha ..
MAX9985ETX+ ,Dual, SiGe, High-Linearity, 700MHz to 1000MHz Downconversion Mixer with LO Buffer/SwitchApplications2200MHz Mixer850MHz WCDMA Base Stations♦ Lead(Pb)-Free PackageGSM 850/GSM 950, 2G/2.5G ..
MAX9985ETX+T ,Dual, SiGe, High-Linearity, 700MHz to 1000MHz Downconversion Mixer with LO Buffer/SwitchELECTRICAL CHARACTERISTICS(Using the Typical Application Circuit, no input RF or LO signals applied ..
MAX9986AETP , SiGe High-Linearity, 815MHz to 1000MHz Downconversion Mixer with LO Buffer/Switch

MAX5428EUA
32-Tap, One-Time Programmable, Linear-Taper Digital Potentiometers
General Description
The MAX5427/MAX5428/MAX5429 linear-taper digital
potentiometers function as mechanical potentiometers,
but replace the mechanics with a simple 2-wire digital
interface. These digital potentiometers are unique in that
they have an optional one-time programmable feature
that either sets the wiper’s power-on reset (POR) posi-
tion to a user-defined value, or the wiper can be set and
the interface disabled to prevent further adjustment.
The MAX5427 has an end-to-end resistance of 100kΩ,
the MAX5428 a resistance of 50kΩ, and the MAX5429 a
resistance of 10kΩ. All these devices have 32 wiper
positions, operate from a single 2.7V to 5.5V supply, and
use less than 1.5µA (max) static supply current.
The MAX5427/MAX5428/MAX5429 are available in
8-pin thin QFN and µMAX®packages. Each device is
guaranteed over the extended temperature range of
-40°C to +85°C.
Applications
Mechanical Potentiometer Replacement
Products Using One-Time Factory Calibration
FeaturesWiper Position Stored After One-Time Fuse
ProgrammingUser-Defined Power-On Reset Position35ppm/°C End-to-End Temperature Coefficient
and 5ppm/°C Ratiometric Temperature Coefficient32 Tap PositionsTiny 8-Pin Thin QFN and µMAX PackagesUltra-Low 1.5µA (max) Static Supply Current2.7V to 5.5V Single-Supply OperationWiper Position Programmed Through Simple
2-Wire Serial Interface10kΩ, 50kΩ, and 100kΩEnd-to-End Resistances
MAX5427/MAX5428/MAX5429
One-Time Programmable, Linear-Taper
Digital Potentiometers
Ordering Information
MAX5427
MAX5428
MAX5429
POSITION
DECODER
UP/DOWN
COUNTER
ONE-TIME
PROGRAM
BLOCK
S31
S32
S30
R31
R30W
VDD
VPP
GND
U/D
Functional Block Diagram
19-2462; Rev 2; 3/05
EVALUATION KIT
AVAILABLE
PARTTEMP RANGEPIN-PACKAGER (kΩ)
MAX5427EUA-40°C to +85°C8 µMAX100
MAX5427ETA-40°C to +85°C8 Thin QFN-EP*100
MAX5428EUA-40°C to +85°C8 µMAX50
MAX5428ETA-40°C to +85°C8 Thin QFN-EP*50
MAX5429EUA-40°C to +85°C8 µMAX10
MAX5429ETA-40°C to +85°C8 Thin QFN-EP*10
VPPGND
VDD
μMAX
TOP VIEW
MAX5427
MAX5428
MAX5429
U/D
VPPGND
*EXPOSED PADDLE. CONNECTED TO GND.
VDD
QFN
MAX5427
MAX5428
MAX5429
U/D
Pin Configurations
*EP = Exposed paddle.
µMax is a registered trademark of Maxim Integrated Products, Inc.
MAX5427/MAX5428/MAX5429
One-Time Programmable, Linear-Taper
Digital Potentiometers
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VDD= 2.7V to 5.5V, VPP = GND, VH= VDD, VL= GND, TA= -40°C to +85°C, unless otherwise noted. Typical values are at VDD=
5.0V, TA= +25°C, unless otherwise noted.) (Note 1)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
VDDto GND...........................................................-0.3V to +6.0V
VPPto GND..........................................................-0.3V to +12.0V
All Other Pins to GND.................................-0.3V to (VDD+ 0.3V)
Input and Output Latchup Immunity...............................±200mA
Maximum Continuous Current into H, L, and W
MAX5427.................................................................±1.5mA
MAX5428.................................................................±1.5mA
MAX5429.................................................................±2.0mA
Continuous Power Dissipation (TA= +70°C)
8-Pin µMAX (derate 4.5mW/°C above +70°C).............362mW
8-Pin QFN-EP (derate 24.4mW/°C above +70°C)......1951mW
Operating Temperature Range...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
DC PERFORMANCE
Resolution32Taps
MAX542775100125
MAX542837.55062.5End-to-End Resistance
MAX54297.51012.5
End-to-End Resistance TempcoTCR35ppm/°C
MAX5427/MAX54285Ratiometric Resistance TempcoMAX542910ppm/°C
Integral NonlinearityINLPotentiometer configuration, no load,
Figure 1±1LSB
Differential NonlinearityDNLPotentiometer configuration, no load,
Figure 1±1LSB
Full-Scale ErrorPotentiometer configuration, no load,
Figure 1-0.5LSB
Zero-Scale ErrorPotentiometer configuration, no load,
Figure 1+0.5LSB
Wiper ResistanceRWMAX5427 IW = 20µA; MAX5428 IW = 40µA;
MAX5429 IW = 200µA100240Ω
DIGITAL INPUTS (CS, U/D)
Input High VoltageVIH0.7 x
VDDV
Input Low VoltageVIL0.3 x
VDDV
Input CurrentIIN±0.1±1µA
Input CapacitanceCIN5pF
TIMING CHARACTERISTICS (Note 2)
U/D Mode to CS SetuptCUFigures 2, 350ns
CS Hold to U/D ModetCIFigures 2, 350ns
U/D Step Hold to CStICFigures 2, 30ns
U/D Step Low TimetILFigures 2, 3100ns
MAX5427/MAX5428/MAX5429
One-Time Programmable, Linear-Taper
Digital Potentiometers
ELECTRICAL CHARACTERISTICS (continued)
(VDD= 2.7V to 5.5V, VPP = GND, VH= VDD, VL= GND, TA= -40°C to +85°C, unless otherwise noted. Typical values are at VDD=
5.0V, TA= +25°C, unless otherwise noted.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
U/D Step High TimetIHFigures 2, 3100ns
Wiper Switching TimetIWCL = 0pF, Figures 2, 3100ns
VPP Rising Edge to CS Falling
EdgetPCFigure 41ms
CS Falling Edge to VPP Falling
EdgetCPFigure 45ms
CS Step Low TimetCLFigure 45ms
CS Step High TimetCHFigure 45ms
VPP Falling Edge to CS Rising
EdgetPHFigure 41ms
U/D FrequencyfU/DMAX5MHz
Power-Up TimetUP(Note 3)1ms
100kΩ variable resistor configuration,
CL = 10pF, Figure 11
Output Settling TimetSETTLE100kΩ potentiometer configuration,
CL = 10pF, Figure 10.25
POWER SUPPLY
Supply VoltageVDD2.75.5V
Static Supply CurrentIDD(Note 4)1.5µA
TA < +50°C10.4511.55Programming VoltageVPPTA ≥ +50°C1111.55V
Programming CurrentIPPVPP = 11V5mA
Note 1:All devices are production tested at TA= +25°C and are guaranteed by design for TA= -40°C to +85°C.
Note 2:Digital timing is guaranteed by design, not production tested.
Note 3:Power-up time is the period of time from when the power supply is applied until the serial interface is ready for writing.
Note 4:Digital inputs CSand U/Dare connected to GND or VDD.
POTENTIOMETER
CONFIGURATION
VARIABLE-RESISTOR
CONFIGURATION
Figure 1. Potentiometer/Variable-Resistor Configuration
MAX5427/MAX5428/MAX5429
One-Time Programmable, Linear-Taper
Digital Potentiometers
Typical Operating Characteristics
(VDD= 5.0V, TA = +25°C, unless otherwise noted.)
WIPER RESISTANCE vs. WIPER VOLTAGE
MAX5427 toc01
WIPER VOLTAGE (V)
WIPER RESISTANCE (321
VDD = 3.3V
VDD = 5.0V
END-TO-END RESISTANCE PERCENT
CHANGE vs. TEMPERATURE
MAX5427-29 toc02
TEMPERATURE (°C)
END-TO-END RESISTANCE CHANGE (%)3510-15
MAX5429
MAX5428
MAX5427
W-TO-L RESISTANCE
vs. TAP POSITION
MAX5427-29 toc03
TAP POSITION
W-TO-L RESISTANCE (k2015105
MAX5427
MAX5428
MAX5429
SUPPLY CURRENT vs. TEMPERATURE
MAX5427-29 toc04
TEMPERATURE (°C)
SUPPLY CURRENT (3510-15
VDD = 5.0V
VDD = 3.3V
R-DNL ERROR vs. INPUT CODE
(MAX5427)
MAX5427-29 toc07
INPUT CODE (DECIMAL)
R-DNL (LSB)2051015
R-INL ERROR vs. INPUT CODE
(MAX5427)
MAX5427-29 toc08
INPUT CODE (DECIMAL)
R-INL (LSB)2015105
R-DNL ERROR vs. INPUT CODE
(MAX5428)
MAX5427-29 toc09
INPUT CODE (DECIMAL)
R-DNL (LSB)2051015
TAP-TO-TAP SWITCHING TRANSIENT
MAX5427-29 toc05
100ns/div
OUTPUT
100mV/div
U/D
2V/div
CL = 10pF
WIPER TRANSIENT AT POWER-ON
MAX5427-29 toc06
2μs/div
OUTPUT
1V/div
VDD
2V/div
Detailed Description
The MAX5427/MAX5428/MAX5429 are 100kΩ/50kΩ/
10kΩ(end-to-end resistance) digitally controlled poten-
tiometers. They have 32 tap positions that are accessible
to the wiper along the resistor array between H and L.
The wiper (W) position is adjusted sequentially through
the tap positions using a simple 2-wire interface. These
digital potentiometers have an optional one-time pro-
grammable feature that sets the POR position of the
wiper. The 2-wire interface can then be disabled, perma-
nently preventing unwanted adjustment.
Digital Interface Operation
The MAX5427/MAX5428/MAX5429 have two modes of
operation when the serial interface is active: increment
mode and decrement mode. The serial interface is only
active when CSis low.
The CSand U/Dinputs control the position of the wiper
along the resistor array. When CStransitions from high
to low, the part goes into increment mode if U/Dis high
(Figure 2), and into decrement mode if U/Dis low
(Figure 3). Once the mode is set, the device remains in
that mode until CSgoes high. A low-to-high transition at
the U/Dincrements or decrements the wiper position
depending on the current mode.
When the CSinput transitions to high (when serial inter-
face is inactive) and U/Dis low, the wiper increments or
decrements one position in accordance with the state
of U/Dwhen CSwent low. If U/Dis high when CStran-
sitions to high, the wiper remains in the same position.
MAX5427/MAX5428/MAX5429
One-Time Programmable, Linear-Taper
Digital Potentiometers
Pin Descriptionypical Operating Characteristics (continued)
(VDD= 5.0V, TA = +25°C, unless otherwise noted.)
R-INL ERROR vs. INPUT CODE
(MAX5428)
MAX5427-29 toc10
INPUT CODE (DECIMAL)
R-INL (LSB)2015105
R-DNL ERROR vs. INPUT CODE
(MAX5429)
MAX5427-29 toc11
INPUT CODE (DECIMAL)
R-DNL (LSB)2015105
R-INL ERROR vs. INPUT CODE
(MAX5429)
MAX5427-29 toc12
INPUT CODE (DECIMAL)
R-INL (LSB)2015105
PINNAMEFUNCTIONWWiper ConnectionCS
Chip-Select Input. A high-to-low CS transition determines the mode: increment if U/D is high, or
decrement if U/D is low. CS is also used for one-time programming (see the One-Time Programming
section).
3VDDPower-Supply VoltageGNDGround
5VPPProgramming Voltage for One-Time Programming. Connect VPP to 10V supply when one-time
programming the device. For normal operation, connect to ground or let float.
6U/DUp/Down Control Input. With CS low, a low-to-high transition increments or decrements the wiper
position.LLow Terminal of ResistorHHigh Terminal of Resistor
MAX5427/MAX5428/MAX5429
The value of the counter is then stored and the wiper
position is maintained.
The wiper performs a make-before-break transition,
ensuring that there is never an open circuit during a tran-
sition from one resistor tap to another. When the wiper is
at either end (max/min) of the resistor array, additional
transitions in the direction of the endpoint do not change
the counter value (the counter does not wrap around).
One-Time Programming
The factory-set default position of the wiper on power-
up is tap 16. However, the power-up position can be
changed once using the one-time programming fea-
ture. After the wiper is moved to the desired position,
the programming sequence is initiated by setting U/D
high, applying 11V to VPP, and then taking CSlow. Five
pulses on CS(consisting of CSstarting from low and
going high for tCHand then low for tCL) program the
device (Figure 4). The programming voltage should
then be taken to zero. After the device is programmed,
VPPcan be set to zero or be allowed to float. The wiper
position is still adjustable, but always returns to this
programmed position on power-up.
If the intent is to program the device to a specific wiper
position and not to allow further adjustments, then six
programming pulses are required (as opposed to five),
as shown in Figure 4. The sixth pulse locks the wiper
position and disables the serial interface. This also
allows U/Dand CSto float without any increase in sup-
ply current. Once the lockout bit is set, no further
adjustment to the potentiometer is possible, effectively
changing the potentiometer into a fixed resistor-divider
(Table 1).
One-Time Programmable, Linear-Taper
Digital Potentiometers
VDD
U/D
tUP
tCUtCItIL
tIW
tIHtIC
Figure 2. Increment Mode Serial Interface Timing Diagram
VDD
U/D
tUP
tCUtCItIH
tIW
tILtIC
Figure 3. Decrement Mode Serial Interface Timing Diagram
MODE
POWER-ON
RESET WIPER
POSITION
ADJUSTABLE
WIPER
Factory Default
(Unprogrammed)Tap 16Yes
Programmed
(5 Programming Pulses)
Programmed
positionYes
Lock-Bit Set
(6 Programming Pulses)
Programmed
positionNo
Table 1. One-Time Programming Options

Partno	Mfg	Dc	Qty	Available	Descript
MAX5428EUA	MAXIM	N/a	1	avai	32-Tap, One-Time Programmable, Linear-Taper Digital Potentiometers