General Description
The DS4303 is a nonvolatile (NV) sample and infinite-
hold adjustable voltage reference. The reference volt-
age is programmed in-circuit during factory calibration/
programming. Programming the reference voltage,
V
OUT
, is as simple as applying the desired voltage on
V
IN
and toggling the adjust pin (ADJ) to lock the V
OUT
voltage level indefinitely, even if the device is power
cycled. The DS4303 replaces current cumbersome fac-
tory 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 arrange-
ment, lower inventory costs, and a quicker time-to-market.
Applications
Power-Supply Calibration
Threshold Setting
Offset Nulling
Bias Adjusting
Power Amps
Pressure Bridges
Factory-Calibrated Equipment
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
Voltage Sample and Infinite Hold
______________________________________________ Maxim Integrated Products
1
GND
V
OUT
V
IN
1
5
V
CC
ADJ
DS4303
SOT23
TOP VIEW
2
3
4
Pin Configuration
Ordering Information
SHUNT
VOLTAGE
REFERENCE
ACCESS FOR
AUTOMATED
ALIGNMENT
REFERENCE
VOLTAGE
REFERENCE
VOLTAGE
HAND SELECTED
0.1% RESISTOR
OR MECHANICAL POT
EXISTING SOLUTION
DS4303 SOLUTION
DS4303
V
CC
GND
V
OUT
V
IN
ADJ
V
CC
Typical Operating Circuit
Rev 0; 3/05
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
PART
TEMP RANGE
PIN-
PACKAGE
SOT
MARK
DS4303R/T&R
-40
C to +85C
SOT23-5
4303
DS4303R+T&R
-40
C to +85C
SOT23-5
4303+
+Denotes lead-free package.
DS4303
Voltage Sample and Infinite Hold
2
_____________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
RECOMMENDED OPERATING CONDITIONS
(T
A
= -40C to +85C)
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.
Voltage on V
CC
Relative to GND ...........................-0.5V to +6.0V
Voltage on V
IN
, ADJ, and V
OUT
Relative to GND ...-0.5V to (V
CC
+ 0.5V), not to exceed +6.0V
Operating Temperature Range ...........................-40
C to +85C
EEPROM Programming Adjust Temperature..........0
C to +70C
V
OUT
to GND Short-Circuit Duration .........................Continuous
Storage Temperature Range .............................-55
C to +125C
Soldering Temperature ...See IPC/JEDEC J-STD-020 Specification
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Supply Voltage
V
CC
(Note 1)
2.4
3.6
V
V
IN
Voltage Range
V
IN
0.3
V
CC
- 0.3
V
ADJ Logic 0
V
IL
-0.3
0.3 x V
CC
V
V
OUT
Current
V
OUTI
-1
+1
mA
V
OUT
Load
V
OUTL
100
pF
ELECTRICAL CHARACTERISTICS
(V
CC
= +2.4 to +3.6V, T
A
= -40C to +85C, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Supply Current
I
CC
V
IN
, ADJ and V
OUT
= open circuit
1.1
1.6
mA
V
IN
Resistance
R
PD
95
k
ADJ Pullup Resistance
R
PU
18
k
V
OUT
Voltage Range
V
OUTR
(Note 1)
0.3
V
C C
- 0.3
V
V
OUT
Tracking Accuracy
V
OUTTA
(Note 2)
20
mV
V
OUT
Quantization
V
OUTQ
(Note 3)
1
mV
-40C to +85C, V
OUT
= 0.4V
104
V/C
-40C to +25C, V
OUT
= 3.0V
-5
+28
+62
V
OUT
Temperature Coefficient
V
OUTTC
+25C to +85C, V
OUT
= 3.0V
-31
-13
+6
ppm/C
V
OUT
Line Regulation
V
OUTLN
-4.0
+1.0
mV/V
V
OUT
Load Regulation
V
OUTLD
-1mA
V
OUTI
+1mA
5.5
mV/mA
Long-Term Stability
V
OUTLTS
1000 hours at +25C
TBD
ppm
e
n1
0.1Hz
10Hz
200
V
P-P
V
OUT
Noise
e
n2
10Hz
1kHz
26
V
RMS
V
OUT
PSRR
V
OUTPSRR
= 200kHz
21
dB
V
OUT
Self-Adjust Settling Time
t
ST
(Note 4)
11
15
ms/V
EEPROM Programming Time
t
W
(Note 5)
9
12
ms
Turn-On Time
t
ON
V
IN
and ADJ = open circuit (Note 6)
10
s
ADJ Toggle Low Time
t
ADJ
100
ns
V
OUT
Factory Trimmed Value
V
OUT FT
+25C, V
CC
= 3.3V (Note 7)
1200
mV
DS4303
Voltage Sample and Infinite Hold
_____________________________________________________________________
3
ACTIVE SUPPLY CURRENT
vs. TEMPERATURE (V
OUT
= 0.3V)
DS4303 toc01
TEMPERATURE (
C)
SUPPLY CURRENT (mA)
60
35
10
-15
1.05
1.10
1.15
1.20
1.25
1.30
1.00
-40
85
V
CC
= 3.3V
V
CC
= 3.6V
V
CC
= 3.0V
V
CC
= 2.4V
I
L
= 0mA
ADJ = V
CC
1.27
1.29
1.31
1.33
1.35
1.37
1.39
1.41
1.43
1.45
1.25
ACTIVE SUPPLY CURRENT
vs. TEMPERATURE (V
OUT
= 3.0V)
DS4303 toc02
TEMPERATURE (
C)
SUPPLY CURRENT (mA)
60
35
10
-15
-40
85
V
CC
= 3.3V
V
CC
= 3.6V
I
L
= 0mA
ADJ = V
CC
ACTIVE SUPPLY CURRENT
vs. SUPPLY VOLTAGE
DS4303 toc03
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
3.4
3.2
2.6
2.8
3.0
1.05
1.10
1.15
1.20
1.25
1.30
1.35
1.40
1.00
2.4
3.6
T
A
= -40
C
T
A
= +25
C
T
A
= +85
C
I
L
= 0mA
Typical Operating Characteristics
(V
CC
= 3.3V, T
A
= +25C, unless otherwise noted.)
Note 1: All voltages referenced to ground.
Note 2: Tracking accuracy is defined as V
OUT
- V
IN
after the DS4303 has completed self-adjustment.
Note 3: Quantization refers to the size of the voltage steps used to track the input signal.
Note 4: Settling time is the maximum amount of time V
OUT
requires to self-adjust. The settling time is determined by the following
formula:
V
OUT
x t
ST
.
Note 5: EEPROM programming time is the hold time required after the DS4303 has completed self-adjustment before V
IN
or V
CC
can be removed or before ADJ can be toggled low once again.
Note 6: Turn-on time is defined as the time required for V
OUT
to reach its specified accuracy after the required supply voltage is
applied.
Note 7: V
OUT
not loaded.
Note 8: Guaranteed by design.
NONVOLATILE MEMORY CHARACTERISTICS
(V
CC
= +2.4V to 3.6V, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Programming Cycles
+70C (Note 8)
50,000
Cycles
DS4303
Voltage Sample and Infinite Hold
4
_____________________________________________________________________
Typical Operating Characteristics (continued)
(V
CC
= 3.3V, T
A
= +25C, unless otherwise noted.)
3.55
3.50
3.35
3.40
3.45
3.30
3.60
-350
-300
-250
-200
-100
-150
-50
0
-400
LINE REGULATION
(V
OUT
= 3.0V)
DS4303 toc07
SUPPLY VOLTAGE (V)
OUTPUT VOLTAGE CHANGE (
V)
T
A
= -40
C
T
A
= +25
C
T
A
= +85
C
I
L
= 0mA
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY (V
CC
= 3.6V)
DS4303 toc08
FREQUENCY (kHz)
PSRR (dB)
100
25
30
35
40
45
50
20
10
1,000
V
OUT
= 0.3 V,
V
CC-AC
= 300mV
V
OUT
= 3.0 V,
V
CC-AC
= 300mV
RMS
DS4303 OUTPUT NOISE
(0.1Hz TO 10Hz)
DS4303 toc09
TIME (s)
V
OUT
(
V)
3
2
1
-200
-100
0
100
200
300
-300
0
4
V
CC
= 3.6V
V
OUT
= 3.0V
DS4303 OUTPUT NOISE
(10Hz to 1kHz)
FREQUENCY (Hz)
V
OUT NOISE
/
Hz
100
1
2
3
4
5
6
0
10
1000
DS4303 toc10
V
CC
= 3.6V
V
OUT
= 3.0V
VOLTS
0.5
1.0
1.5
2.0
3.0
2.5
3.5
4.0
0
DS4303 TURN-ON
TRANSIENT
DS4303 toc11
1
s/div
V
CC
V
OUT
C
OUT
=100pF
DS4303 LOAD TRANSIENT
(V
OUT
= 3.3V, V
CC
= 3.6V)
DS4303 toc12
0.2ms/div
+1mA
-1mA
V
OUT
AC-COUPLED
200mV/div
I
OUT
-3
-2
-1
0
1
2
3
-4
LOAD REGULATION
(V
OUT
= 3.0V)
DS4303 toc05
LOAD CURRENT (mA)
OUTPUT VOLTAGE (mV)
0.5
0
-0.5
-1.0
1.0
V
CC
= 3.6V
T
A
= -40
C
T
A
= +25
C
T
A
= +85
C
LINE REGULATION
(V
OUT
= 0.3V)
DS4303 toc06
SUPPLY VOLTAGE (V)
OUTPUT VOLTAGE CHANGE (
V)
3.4
3.2
3.0
2.8
2.6
-2500
-2000
-1500
-1000
-500
0
-3000
2.4
3.6
T
A
= -40
C
T
A
= +25
C
T
A
= +85
C
I
L
= 0mA
LOAD REGULATION
(V
OUT
= 0.3V)
DS4303 toc04
LOAD CURRENT (mA)
OUTPUT VOLTAGE CHANGE (mV)
0.5
0
-0.5
-4
-3
-2
-1
0
1
2
3
4
5
-5
-1.0
1.0
V
CC
= 3.0V
T
A
= -40
C
T
A
= +25
C
T
A
= +85
C
DS4303
Voltage Sample and Infinite Hold
_____________________________________________________________________
5
DS4303 LINE TRANSIENT
(V
OUT
= 2.0)
DS4303 toc13
0.2ms/div
3.6V
V
CC
3.0V
V
OUT
AC-COUPLED
200mV/div
DS4303 SHUTDOWN TRANSIENT
(V
OUT
= 3.3V)
DS4303 toc14
2ms/div
500mV/div
V
CC
V
OUT
C
OUT
= 100pF
DS4303 V
OUT
ADJUST TRANSIENT
(V
CC
= 3.6V, V
IN
= 3.3V)
DS4303 toc15
5ms/div
2V/div
1V/div
ADJ
V
OUT
DS4303 NORMALIZED V
OUT
vs. TEMPERATURE (V
OUT
= 0.4V)
DS4303 toc16
TEMPERATURE (
C)
V
OUT
(V/V)
60
35
10
-15
0.993
0.998
1.003
1.008
0.988
-40
85
V
CC
= 3.3V
0.9970
0.9975
0.9980
0.9985
0.9995
0.9990
1.0000
1.0005
0.9965
DS4303 NORMALIZED V
OUT
vs. TEMPERATURE (V
OUT
= 3.0V)
DS4303 toc17
TEMPERATURE (
C)
V
OUT
(V/V)
60
35
10
-15
-40
85
V
CC
= 3.3V
Typical Operating Characteristics (continued)
(V
CC
= 3.3V, T
A
= +25C, unless otherwise noted.)
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