Sample-and-Infinite Hold Voltage Reference Precise Electronically

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Sample-and-Infinite Hold Voltage Reference Precise Electronically

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Sample-and-Infinite Hold Voltage Reference
Precise Electronically Adjustable Voltage Reference Enables Automated Factory Trimming Devices Needing Voltage Adjustment Adjusted Within ±1.5mV Wide Adjustable Output Voltage Range Within 300mV Supply Rails Temperature Coefficient ±1mA Output-Current Drive Memory Stores Voltage Indefinitely Output Short-Circuit Protection Cost
DS4305
DS4305 nonvolatile (NV) sample-and-infinitehold adjustable voltage reference. reference voltage programmed in-circuit during factory calibration/ programming. Programming reference voltage, VOUT, simple applying desired voltage toggling adjust (ADJ) lock VOUT voltage level indefinitely, even device power cycled. DS4305 replaces current cumbersome factory adjustment arrangements with low-cost solution that adjusted using automated techniques. addition, DS4305 ability readjusted after unit been fully assembled tested. This results much more flexible manufacturing arrangement, lower inventory costs, quicker time-to-market.
Applications
Power-Supply Calibration Threshold Setting Offset Nulling Bias Adjusting Power Amps Pressure Bridges Factory-Calibrated Equipment
Power Consumption 4.0V 5.5V Single-Supply Operation Small 5-Lead SOT23 Package -40°C +125°C Temperature Operation DS4305K Evaluation Available
Ordering Information
PART DS4305R+T&R TEMP RANGE -40°C +125°C PINPACKAGE SOT23 MARK 4305+
+Denotes lead-free package.
Typical Operating Circuit
EXISTING SOLUTION DS4305 SOLUTION
Configuration
VIEW
REFERENCE VOLTAGE
SHUNT VOLTAGE REFERENCE
DS4305
HAND-SELECTED 0.1% RESISTOR MECHANICAL
VOUT
REFERENCE VOLTAGE
DS4305
ACCESS AUTOMATED ALIGNMENT
VOUT
SOT23
Maxim Integrated Products
pricing, delivery, ordering information, please contact Maxim/Dallas Direct! 1-888-629-4642, visit Maxim's website www.maxim-ic.com.
Sample-and-Infinite Hold Voltage Reference DS4305
ABSOLUTE MAXIMUM RATINGS
Voltage Relative .-0.5V +6.0V Voltage VIN, ADJ, VOUT Relative .-0.5V (VCC 0.5V), exceed +6.0V Operating Temperature Range .-40°C +125°C EEPROM Programming Adjust Temperature.0°C +70°C VOUT Short-Circuit Duration .Continuous Storage Temperature Range .-55°C +125°C Soldering Temperature .See IPC/JEDEC J-STD-020 Specification
Stresses beyond those listed under "Absolute Maximum Ratings" cause permanent damage device. These stress ratings only, functional operation device these other conditions beyond those indicated operational sections specifications implied. Exposure absolute maximum rating conditions extended periods affect device reliability.
RECOMMENDED OPERATING CONDITIONS
-40°C +125°C)
PARAMETER Supply Voltage Voltage Range Logic VOUT Current VOUT Load SYMBOL VOUTI VOUTL (Note CONDITIONS -0.3 UNITS
ELECTRICAL CHARACTERISTICS
(VCC +4.0V +5.5V, -40°C +125°C, unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS -40°C +85°C; VIN, ADJ, VOUT open circuit +85°C +125°C; VIN, ADJ, VOUT open circuit (Note (Note (Note -40°C +85°C, VOUT 0.7V VOUT Temperature Coefficient VOUT -40°C +25°C, VOUT 5.0V, 5.3V +25°C +85°C, VOUT 5.0V, 5.3V +85°C +125°C, VOUT 5.0V, 5.3V VOUT Line Regulation VOUT Load Regulation Long-Term Stability VOUT Noise VOUT VOUT VOUTLTS -40°C +85°C +85°C +125°C -40°C +85°C, -1mA VOUT +1mA +85°C +125°C, -1.0mA VOUT +1.0mA 1000 hours +25°C 0.1Hz 10Hz 10Hz 1kHz -1.6 -1.6 +1.8 +1.8 mV/V mV/mA µVP-P µVRMS ppm/°C ±1.5 µV/°C UNITS
Supply Current
Resistance Pullup Resistance VOUT Voltage Range VOUT Tracking Accuracy VOUT Quantization
VOUTR VOUTTA VOUTQ
Sample-and-Infinite Hold Voltage Reference
ELECTRICAL CHARACTERISTICS (continued)
(VCC +4.0V +5.5V, -40°C +125°C, unless otherwise noted.)
PARAMETER VOUT PSRR VOUT Self-Adjust Settling Time EEPROM Programming Time Turn-On Time Toggle Time VOUT Factory-Trimmed Value SYMBOL VOUTPSRR tADJ VOUT +25°C, 5.8V (Note 200kHz (Note (Note open circuit (Note 1200 CONDITIONS UNITS ms/V
DS4305
NONVOLATILE MEMORY CHARACTERISTICS
(VCC +4.0V 5.5V, unless otherwise noted.)
PARAMETER Programming Cycles SYMBOL +70°C (Note CONDITIONS 50,000 UNITS Cycles
Note Note Note Note Note Note Note Note
voltages referenced ground. Tracking accuracy defined VOUT after DS4305 completed self-adjustment. Quantization refers size voltage steps used track input signal. Settling time maximum amount time VOUT requires self-adjust. settling time determined following formula: VOUT tST. EEPROM programming time hold time required after DS4305 completed self-adjustment before removed before toggled once again. Turn-on time defined time required VOUT reach specified accuracy after required supply voltage applied. VOUT loaded. Guaranteed design.
Typical Operating Characteristics
(VCC 5.0V, +25°C, unless otherwise noted.)
ACTIVE SUPPLY CURRENT TEMPERATURE (VOUT 0.3V)
DS4305 toc01
ACTIVE SUPPLY CURRENT TEMPERATURE (VOUT 3.5V)
DS4305 toc02
ACTIVE SUPPLY CURRENT SUPPLY VOLTAGE (VOUT 0.3V)
DS4305 toc03
SUPPLY CURRENT (mA) 5.0V TEMPERATURE (°C) 4.0V 5.5V
SUPPLY CURRENT (mA) 5.5V 5.0V TEMPERATURE (°C) 4.0V
SUPPLY CURRENT (mA) +125°C +25°C -40°C +85°C
SUPPLY VOLTAGE
Sample-and-Infinite Hold Voltage Reference DS4305
Typical Operating Characteristics (continued)
(VCC 5.0V, +25°C, unless otherwise noted.)
LOAD REGULATION (VOUT 0.3V)
DS4305 toc04
LOAD REGULATION (VOUT 5.2V)
DS4305 toc05
LINE REGULATION (VOUT 0.3V)
DS4305 toc06
OUTPUT VOLTAGE CHANGE (mV) -40°C -0.5 +25°C -1.0 -1.5 -1.0 -0.5 4.0V +125°C +85°C
OUTPUT VOLTAGE CHANGE (mV) -0.5 -1.0 -1.5 +125°C -2.0 5.5V -2.5 -40°C +25°C +85°C
-100 -200 +125°C -300 -40°C -400 +85°C -500 -600
-1.0
-0.5
-1.0
OUTPUT VOLTAGE CHANGE (µV)
LOAD CURRENT (mA)
LOAD CURRENT (mA)
SUPPLY VOLTAGE
LINE REGULATION (VOUT 3.5V)
DS4305 toc07
POWER-SUPPLY REJECTION RATIO FREQUENCY (VCC 5.0V)
DS4305 toc08
DS4305 OUTPUT NOISE (0.1Hz 10Hz)
DS4305 toc09
-40°C OUTPUT VOLTAGE CHANGE (µV) +85°C
PSRR (dB) VOUT 0.3V, VCC-AC 300mVRMS
+125°C -100 SUPPLY VOLTAGE
VOUT 4.5V, VCC-AC 300mVRMS
VOUT (µV)
-100 -200 5.5V -300 VOUT TIME
1000
FREQUENCY (kHz)
DS4305 OUTPUT NOISE (10Hz 1kHz)
DS4305 toc10
DS4305 TURN-ON TRANSIENT
VOLTAGE VOUT
DS4305 toc11
DS4305 LOAD TRANSIENT (VOUT 3.0V, 5.0V)
µVOUT NOISE (VHz) FREQUENCY (Hz) 5.5V VOUT
DS4305 toc12
+1mA IOUT -1mA VOUT AC-COUPLED 300mV/div COUT =100pF 1µs/div
1000
Sample-and-Infinite Hold Voltage Reference DS4305
Typical Operating Characteristics (continued)
(VCC 5.0V, +25°C, unless otherwise noted.)
DS4305 LINE TRANSIENT (VOUT 3.0V)
DS4305 toc13
DS4305 SHUTDOWN TRANSIENT (VOUT 4.0V)
DS4305 toc14
5.5V 4.0V 1.1V/div VOUT
VOUT AC-COUPLED 300mV/div
COUT 100pF
DS4305 VOUT ADJUST TRANSIENT (VIN 0.3V 4.0V, 5.0V)
DS4305 toc15
DS4305 NORMALIZED VOUT TEMPERATURE (VOUT 0.7V)
1.008
DS4305 toc16
1.010
2V/div
VOUT (V/V)
1.006 1.004 1.002 1.00 0.998 0.996 0.994 0.992 0.990 5.0V
1V/div
VOUT
TEMPERATURE (°C)
DS4305 NORMALIZED VOUT TEMPERATURE (VOUT 5.0V)
DS4305 toc17
1.001 1.000 0.999 VOUT (V/V) 0.998 0.997 0.996 0.995 5.5V
TEMPERATURE (°C)
Sample-and-Infinite Hold Voltage Reference DS4305
Description
NAME VOUT Ground Sample Voltage Input Voltage Output Power-Supply Voltage FUNCTION Adjust Control Input
Detailed Description
DS4305 provides precise, output voltage, VOUT, making ideal solution factory calibration embedded systems. DS4305 output voltage adjusted over almost entire operating supply range device, precisely within ±1.5mV. graphical description DS4305 provided block diagram. During factory calibration, simple adjustment procedure must followed. This entire procedure includes setting VIN, toggling ADJ, waiting VOUT self-adjusts, waiting completion EEPROM storage cycle (see timing diagram Figure start calibration, voltage must placed VIN. This voltage needs completely stable before adjustment procedure begins, must remain stable throughout entire adjustment procedure. DS4305 starts self-adjust procedure when pulled held least tADJ, after which released time. Once been released, should toggled again remainder adjustment procedure. After falling edge wait time, tADJ, VOUT selfadjust period begins. length VOUT self-adjust period determined using formula tST, where VOUT VOUT
Block Diagram
DS4305
CONTROL EEPROM VREF 12-BIT VOUT
VOUT
VOUT VOUT
VOUT
VOUT
tADJ tADJ tADJ
FIRST PROGRAMMING CYCLE
ADDITIONAL PROGRAMMING CYCLES REQUIRED)
Figure Timing Diagram
Sample-and-Infinite Hold Voltage Reference DS4305
AUTOMATED TEST EQUIPMENT DEVICE-UNDER-TEST (DUT)
DS4305 STEP REFERENCE VOLTAGE STEP TOGGLE DIGITALLY CONTROLLED VOLTAGE SOURCE EEPROM DIGITAL DRIVER BED-OF-NAILS TEST ACCESS DIGITALLY CONTROLLED MEASUREMENT PARAMETER MEASURED DURING CALIBRATION VOLTAGE SAMPLE-ANDINFINITEHOLD VOUT CIRCUITRY REQUIRING VOLTAGE ADJUSTMENT 4.0V 5.5V
STEP DETERMINE REFERENCE VOLTAGE NEEDS ADJUSTMENT
Figure Application Circuit
During VOUT self-adjust period, DS4305 internally adjusts on-board until VOUT matches VIN. After VOUT stabilized within tracking accuracy, VOUTTA, VIN, will automatically stored EEPROM. storage period lasts duration EEPROM write time, After first adjustment procedure completed, measured, necessary readjusted entire adjustment procedure repeated fine-tune VOUT within VOUTQ range. Following each self-adjust procedure, VOUT saved indefinitely, even DS4305 power cycled.
circuit. VOUT readjusted time following same procedure. closed-loop nature adjustment process removes system inaccuracies such resistor tolerances, amplifier offsets, gain mismatches, even inaccuracies automated equipment that provides reference voltage.
Typical Operating Circuit
Typical Operating Circuit shows example DS4305 replace most existing calibration solutions. Many power supplies shunt voltage reference provide internal reference voltage, fine-tune adjustments often made with hand-selected discrete resistors. DS4305 replaces this cumbersome arrangement with solution that capable being adjusted automated techniques. additional benefit DS4305 ability provide much lower voltage (down 300mV) than possible with shunt voltage references. Another benefit DS4305 ability adjusted after unit been fully assembled tested, resulting much more flexible manufacturing arrangement, lower inventory costs, quicker time-to-market.
Automated Programming Procedure
Figure details example DS4305 adjusted application. During factory alignment, three/four-node bed-of-nails used provide adjustment voltage through pin, control input, sense needed feedback parameter. During manufacture, automated test procedure adjusts VOUT, changing VIN, until feedback parameter optimized. After bed-of-nails operation complete, both inputs left open
Sample-and-Infinite Hold Voltage Reference DS4305
Layout Considerations
prevent inadvertent programming cycle from occurring during power-up, minimize capacitive loading pin. large capacitance this could potentially hold state long enough that programming cycle initiated.
Chip Topology
TRANSISTOR COUNT: 6016 SUBSTRATE CONNECTED GROUND
Power-Supply Decoupling
achieve best results, highly recommended that decoupling capacitor used power-supply pin. Typical values decoupling capacitors 0.01µF 0.1µF. high-quality, ceramic, surface-mount capacitor, mount close possible pins minimize lead inductance.
Package Information
latest package outline information,
Maxim cannot assume responsibility circuitry other than circuitry entirely embodied Maxim product. circuit patent licenses implied. Maxim reserves right change circuitry specifications without notice time.
_Maxim Integrated Products, Gabriel Drive, Sunnyvale, 94086 408-737-7600 2006 Maxim Integrated Products Printed registered trademark Maxim Integrated Products, Inc.
registered trademark Dallas Semiconductor Corporation.
Heaney

Sample-and-Infinite Hold Voltage Reference Precise Electronically

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