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Rev 0; 3/05
Voltage Sample and Infinite Hold
General Description
The DS4303 is a nonvolatile (NV) sample and infinitehold adjustable voltage reference. The reference voltage is programmed in-circuit during factory calibration/ programming. Programming the reference voltage, VOUT, is as simple as applying the desired voltage on VIN and toggling the adjust pin (ADJ) to lock the VOUT voltage level indefinitely, even if the device is power cycled. The DS4303 replaces current cumbersome factory adjustment arrangements with a low-cost solution that can be adjusted using automated techniques. In addition, the DS4303 has the ability to be readjusted after the unit has been fully assembled and tested. This results in a much more flexible manufacturing arrangement, lower inventory costs, and a quicker time-to-market.
Features
Precise Electronically Adjustable Voltage Reference Enables Automated Factory Trimming of Devices Needing Voltage Adjustment Can be Adjusted to Within 1mV Wide Adjustable Output Voltage Range Within 300mV of the Supply Rails Low Temperature Coefficient 1mA of Output-Current Drive NV Memory Stores the Voltage Indefinitely Output Short-Circuit Protection Low Cost Low Power Consumption 2.4V to 3.6V Single-Supply Operation Small 5-Lead SOT23 Package
DS4303
Applications
Power-Supply Calibration Threshold Setting Offset Nulling Bias Adjusting Power Amps Pressure Bridges Factory-Calibrated Equipment
Ordering Information
PART DS4303R/T&R TEMP RANGE -40C to +85C PINPACKAGE SOT23-5 SOT23-5 SOT MARK 4303 4303+
DS4303R+T&R -40C to +85C +Denotes lead-free package.
Typical Operating Circuit
TOP VIEW
ADJ
REFERENCE VOLTAGE VCC DS4303 VOUT GND HAND SELECTED 0.1% RESISTOR OR MECHANICAL POT VIN ADJ REFERENCE VOLTAGE
Pin Configuration
EXISTING SOLUTION VCC
DS4303 SOLUTION
1
5
VCC
SHUNT VOLTAGE REFERENCE
GND
2
DS4303
VIN
ACCESS FOR AUTOMATED ALIGNMENT
3
4
VOUT
SOT23
______________________________________________ Maxim Integrated Products
1
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Voltage Sample and Infinite Hold DS4303
ABSOLUTE MAXIMUM RATINGS
Voltage on VCC Relative to GND ...........................-0.5V to +6.0V Voltage on VIN, ADJ, and VOUT Relative to GND ...-0.5V to (VCC + 0.5V), not to exceed +6.0V Operating Temperature Range ...........................-40C to +85C EEPROM Programming Adjust Temperature..........0C to +70C VOUT to GND Short-Circuit Duration .........................Continuous Storage Temperature Range .............................-55C to +125C Soldering Temperature ...See IPC/JEDEC J-STD-020 Specification
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.
RECOMMENDED OPERATING CONDITIONS
(TA = -40C to +85C)
PARAMETER Supply Voltage VIN Voltage Range ADJ Logic 0 VOUT Current VOUT Load SYMBOL VCC VIN VIL VOUTI VOUTL (Note 1) CONDITIONS MIN 2.4 0.3 -0.3 -1 TYP MAX 3.6 VCC - 0.3 0.3 x VCC +1 100 UNITS V V V mA pF
ELECTRICAL CHARACTERISTICS
(VCC = +2.4 to +3.6V, TA = -40C to +85C, unless otherwise noted.)
PARAMETER Supply Current VIN Resistance ADJ Pullup Resistance VOUT Voltage Range VOUT Tracking Accuracy VOUT Quantization VOUT Temperature Coefficient VOUT Line Regulation VOUT Load Regulation Long-Term Stability VOUT Noise VOUT PSRR VOUT Self-Adjust Settling Time EEPROM Programming Time Turn-On Time ADJ Toggle Low Time VOUT Factory Trimmed Value SYMBOL ICC RPD RPU VOUTR VOUTTA VOUTQ VOUTTC VOUTLN VOUTLD VOUTLTS en1 en2 VOUTPSRR tST tW tON tADJ VOUT FT +25C, VCC = 3.3V (Note 7) -1mA VOUTI +1mA 1000 hours at +25C 0.1Hz 10Hz 10Hz 1kHz = 200kHz (Note 4) (Note 5) VIN and ADJ = open circuit (Note 6) 100 1200 TBD 200 26 21 11 9 15 12 10 (Note 1) (Note 2) (Note 3) -40C to +85C, VOUT = 0.4V -40C to +25C, VOUT = 3.0V +25C to +85C, VOUT = 3.0V -5 -31 -4.0 104 +28 -13 +62 +6 +1.0 5.5 CONDITIONS VIN, ADJ and VOUT = open circuit 95 18 0.3 VCC - 0.3 20 1 MIN TYP 1.1 MAX 1.6 UNITS mA k k V mV mV V/C ppm/C mV/V mV/mA ppm VP-P VRMS dB ms/V ms s ns mV
2
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Voltage Sample and Infinite Hold
NONVOLATILE MEMORY CHARACTERISTICS
(VCC = +2.4V to 3.6V, unless otherwise noted.)
PARAMETER Programming Cycles SYMBOL +70C (Note 8) CONDITIONS MIN 50,000 TYP MAX UNITS Cycles
DS4303
Note 1: Note 2: Note 3: Note 4: Note 5: Note 6: Note 7: Note 8:
All voltages referenced to ground. Tracking accuracy is defined as VOUT - VIN after the DS4303 has completed self-adjustment. Quantization refers to the size of the voltage steps used to track the input signal. Settling time is the maximum amount of time VOUT requires to self-adjust. The settling time is determined by the following formula: VOUT x tST. EEPROM programming time is the hold time required after the DS4303 has completed self-adjustment before VIN or VCC can be removed or before ADJ can be toggled low once again. Turn-on time is defined as the time required for VOUT to reach its specified accuracy after the required supply voltage is applied. VOUT not loaded. Guaranteed by design.
Typical Operating Characteristics
(VCC = 3.3V, TA = +25C, unless otherwise noted.)
ACTIVE SUPPLY CURRENT vs. TEMPERATURE (VOUT = 0.3V)
DS4303 toc01
ACTIVE SUPPLY CURRENT vs. TEMPERATURE (VOUT = 3.0V)
DS4303 toc02
ACTIVE SUPPLY CURRENT vs. SUPPLY VOLTAGE
1.35 TA = +85C SUPPLY CURRENT (mA) 1.30 1.25 1.20 1.15 1.10 TA = +25C TA = -40C
DS4303 toc03
1.30 VCC = 3.6V 1.25 SUPPLY CURRENT (mA) VCC = 3.3V 1.20 1.15 1.10 VCC = 2.4V 1.05 IL = 0mA 1.00 -40 -15 10 35 60 ADJ = VCC VCC = 3.0V
1.45 1.43 1.41 SUPPLY CURRENT (mA) 1.39 1.37 1.35 1.33 1.31 1.29 1.27 1.25 IL = 0mA -40 -15 10 ADJ = VCC 35 60 VCC = 3.3V VCC = 3.6V
1.40
1.05 1.00 85 2.4 2.6 2.8 3.0
IL = 0mA 3.2 3.4 3.6
85
TEMPERATURE (C)
TEMPERATURE (C)
SUPPLY VOLTAGE (V)
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Voltage Sample and Infinite Hold DS4303
Typical Operating Characteristics (continued)
(VCC = 3.3V, TA = +25C, unless otherwise noted.)
LOAD REGULATION (VOUT = 0.3V)
DS4303 toc04
LOAD REGULATION (VOUT = 3.0V)
DS4303 toc05
LINE REGULATION (VOUT = 0.3V)
DS4303 toc06
5 4 OUTPUT VOLTAGE CHANGE (mV) 3 2 1 0 -1 -2 -3 -4 -5 -1.0 -0.5 0 0.5 TA = +85C VCC = 3.0V TA = -40C TA = +25C
3 2 OUTPUT VOLTAGE (mV) 1 0 TA = +85C -1 -2 -3 -4 VCC = 3.6V -1.0 -0.5 0 0.5 TA = +25C TA = -40C
0 -500 -1000 -1500 TA = +25C -2000 TA = +85C -2500 IL = 0mA -3000 TA = -40C
1.0
1.0
OUTPUT VOLTAGE CHANGE (V)
2.4
2.6
2.8
3.0
3.2
3.4
3.6
LOAD CURRENT (mA)
LOAD CURRENT (mA)
SUPPLY VOLTAGE (V)
LINE REGULATION (VOUT = 3.0V)
DS4303 toc07
POWER-SUPPLY REJECTION RATIO vs. FREQUENCY (VCC = 3.6V)
DS4303 toc08
DS4303 OUTPUT NOISE (0.1Hz TO 10Hz)
DS4303 toc09
0 OUTPUT VOLTAGE CHANGE (V) -50 -100
50 45 40 PSRR (dB) 35 30 VOUT = 0.3 V, VCC-AC = 300mV
300 200 100 VOUT (V) 0 -100
-150 -200 -250 -300 -350 -400 3.30 3.35 3.40 3.45 3.50 IL = 0mA TA = +25C TA = +85C
TA = -40C
25 20 3.55 3.60 10
VOUT = 3.0 V, VCC-AC = 300mVRMS
-200 VCC = 3.6V -300 100 1,000 0 1 2 TIME (s) 3 4 VOUT = 3.0V
SUPPLY VOLTAGE (V)
FREQUENCY (kHz)
DS4303 OUTPUT NOISE (10Hz to 1kHz)
DS4303 toc10
DS4303 TURN-ON TRANSIENT
3.5 3.0
DS4303 toc11
DS4303 LOAD TRANSIENT (VOUT = 3.3V, VCC = 3.6V)
+1mA IOUT -1mA
6 5 VOUT NOISE / Hz 4
4.0
DS4303 toc12
2.5 VOLTS 2.0 1.5 1.0
VCC VOUT VOUT AC-COUPLED 200mV/div COUT =100pF
3 2 1 VCC = 3.6V 0 10 100 FREQUENCY (Hz) 1000 VOUT = 3.0V
0.5 0 1s/div 0.2ms/div
4
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Voltage Sample and Infinite Hold DS4303
Typical Operating Characteristics (continued)
(VCC = 3.3V, TA = +25C, unless otherwise noted.)
DS4303 LINE TRANSIENT (VOUT = 2.0)
DS4303 toc13
DS4303 SHUTDOWN TRANSIENT (VOUT = 3.3V)
DS4303 toc14
3.6V VCC 3.0V 500mV/div VOUT AC-COUPLED 200mV/div VCC VOUT
COUT = 100pF 0.2ms/div 2ms/div
DS4303 VOUT ADJUST TRANSIENT (VCC = 3.6V, VIN = 3.3V)
2V/div ADJ
DS4303 toc15
DS4303 NORMALIZED VOUT vs. TEMPERATURE (VOUT = 0.4V)
DS4303 toc16
1.008
1.003 VOUT (V/V) 1V/div VOUT 0.993 VCC = 3.3V 0.988 5ms/div -40 -15 10 35 60 85 TEMPERATURE (C) 1.0005 1.0000 0.9995 VOUT (V/V) 0.9990 0.9985 0.9980 0.9975 0.9970 0.9965 -40 -15 10 35 60 85 TEMPERATURE (C) VCC = 3.3V
0.998
DS4303 NORMALIZED VOUT vs. TEMPERATURE (VOUT = 3.0V)
DS4303 toc17
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Voltage Sample and Infinite Hold DS4303
Pin Description
PIN 1 2 3 4 5 NAME ADJ GND VIN VOUT VCC Ground Sample Voltage Input Voltage Output Power-Supply Voltage FUNCTION Adjust Control Input
Detailed Description
The DS4303 provides a precise, NV output voltage, VOUT, making it an ideal solution for factory calibration of embedded systems. The DS4303 output voltage can be adjusted over almost the entire operating supply range of the device, and it can be precisely set to within 1mV. A graphical description of the DS4303 is provided in the block diagram. During factory calibration, a simple adjustment procedure must be followed. This entire procedure includes setting VIN, toggling ADJ, waiting as VOUT self-adjusts, and waiting for the completion of the EEPROM storage cycle (See the timing diagram in Figure 1). At the start of calibration, a voltage must be placed on VIN. This voltage needs to be completely stable before the adjustment procedure begins, and it must remain stable throughout the entire adjustment procedure. The DS4303 will start its self-adjust procedure when the ADJ pin is pulled low and held low for at least tADJ, after which it can be released at any time. Once ADJ has been released, it should not be toggled again for the remainder of the adjustment procedure. After the falling edge on ADJ and the wait time, tADJ, the VOUT self-adjust period begins. The length of the VOUT selfadjust period can be determined using the formula V x tST, where V is | VOUT OLD - VOUT NEW |.
Block Diagram
VCC
DS4303
RPU ADJ ADC AND CONTROL VIN VCC VCC GND RPD EEPROM VREF 12-BIT DAC VOUT
VOUT
VOUT VOUT x tST
VOUT
VOUT x tST
VIN tW tW
ADJ tADJ tADJ tADJ
FIRST PROGRAMMING CYCLE
ADDITIONAL PROGRAMMING CYCLES (IF REQUIRED)
Figure 1. Timing Diagram 6 _____________________________________________________________________
Voltage Sample and Infinite Hold DS4303
AUTOMATED TEST EQUIPMENT
DEVICE UNDER TEST (DUT)
DS4303 2.4V TO 3.6V VCC
STEP 1: SET REFERENCE VOLTAGE STEP 2: TOGGLE ADJ
DIGITALLY CONTROLLED VOLTAGE SOURCE
EEPROM VIN ADJ VOLTAGE SAMPLE AND INFINITE HOLD
DIGITAL PIN DRIVER GND BED-OF-NAILS TEST ACCESS DIGITALLY CONTROLLED MEASUREMENT
VOUT CIRCUITRY REQUIRING VOLTAGE ADJUSTMENT
STEP 3: DETERMINE IF THE REFERENCE VOLTAGE NEEDS ADJUSTMENT
PARAMETER MEASURED DURING CALIBRATION
Figure 2. Application Circuit
During the VOUT self-adjust period, the DS4303 internally adjusts the onboard DAC until VOUT matches VIN. After VOUT has stabilized to within the tracking accuracy, VOUTTA, of VIN, it will be automatically stored in EEPROM. The storage period lasts for the duration of the EEPROM write time, tW. After the first adjustment procedure has completed, V OUT can be measured, and if necessary VIN can be readjusted and the entire adjustment procedure can be repeated to fine-tune VOUT within the VOUTQ range. Following each self-adjust procedure, VOUT is saved indefinitely, even if the DS4303 is power cycled.
circuit. VOUT can be readjusted at any time by following the same procedure. The closed-loop nature of the adjustment process removes all the system inaccuracies such as resistor tolerances, amplifier offsets, gain mismatches, and even the inaccuracies in the automated equipment that provides the reference voltage.
Typical Operating Circuit
The typical operating circuit shows an example of how the DS4303 can replace most existing calibration solutions. Many power supplies use a shunt voltage reference to provide the internal reference voltage, and fine-tune adjustments are often made with hand-selected discrete resistors. The DS4303 replaces this cumbersome arrangement with a solution that is capable of being adjusted by automated techniques. An additional benefit of the DS4303 is the ability to provide a much lower voltage (down to 300mV) than is possible with shunt voltage references. Another benefit of the DS4303 is the ability to be adjusted after the unit has been fully assembled and tested, resulting in a much more flexible manufacturing arrangement, lower inventory costs, and a quicker time-to-market.
Automated Programming Procedure
Figure 2 details an example of how the DS4303 can be adjusted in an application. During factory alignment, a three/four-node bed-of-nails is used to: (1) provide the adjustment voltage through the VIN pin, (2) control the ADJ input, and (3) sense the needed feedback parameter. During manufacture, an automated test procedure adjusts VOUT, by changing VIN, until the feedback parameter is optimized. After the bed-of-nails operation is complete, both the VIN and ADJ inputs are left open
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Voltage Sample and Infinite Hold DS4303
Layout Considerations
To prevent an inadvertent programming cycle from occurring during power-up, minimize capacitive loading on the ADJ pin. A large capacitance on this pin could potentially hold ADJ in a low state long enough that a programming cycle is initiated.
Chip Topology
TRANSISTOR COUNT: 6001 SUBSTRATE CONNECTED TO GROUND
Power-Supply Decoupling
To achieve best results, it is highly recommended that a decoupling capacitor is used on the IC power-supply pin. Typical values of decoupling capacitors are 0.01F or 0.1F. Use a high-quality, ceramic, surface-mount capacitor, and mount it as close as possible to the VCC and GND pins of the IC to minimize lead inductance.
Package Information
For the latest package outline information, go to www.maxim-ic.com/DallasPackInfo.
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2005 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc.
is a registered trademark of Dallas Semiconductor Corporation.

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