DS4303R-U [MAXIM]
Three Terminal Voltage Reference, 1 Output, 3V, Trim/Adjustable, PDSO5, LEAD FREE, SOT23, 5 PIN;
| 型号： | DS4303R-U |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Three Terminal Voltage Reference, 1 Output, 3V, Trim/Adjustable, PDSO5, LEAD FREE, SOT23, 5 PIN 光电二极管 |
| 文件： | 总8页 (文件大小：416K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Rev 0; 3/05
Voltage Sample and Infinite Hold
General Description
Features
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,
♦ Precise Electronically Adjustable Voltage
Reference
♦ Enables Automated Factory Trimming of Devices
Needing Voltage Adjustment
V
V
, is as simple as applying the desired voltage on
OUT
and toggling the adjust pin (ADJ) to lock the V
IN
OUT
♦ Can be Adjusted to Within 1mV
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.
♦ 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
Applications
♦ Low Power Consumption
Power-Supply Calibration
Threshold Setting
Offset Nulling
♦ 2.4V to 3.6V Single-Supply Operation
♦ Small 5-Lead SOT23 Package
Bias Adjusting
Power Amps
Ordering Information
Pressure Bridges
Factory-Calibrated Equipment
PIN-
SOT
PART
TEMP RANGE
PACKAGE
MARK
DS4303R/T&R
DS4303R+T&R
-40°C to +85°C
-40°C to +85°C
SOT23-5
SOT23-5
4303
4303+
+Denotes lead-free package.
Typical Operating Circuit
Pin Configuration
TOP VIEW
EXISTING SOLUTION
DS4303 SOLUTION
V
CC
ADJ
1
2
3
5
4
V
CC
REFERENCE
VOLTAGE
DS4303
V
CC
REFERENCE
VOLTAGE
DS4303
V
OUT
GND
SHUNT
VOLTAGE
REFERENCE
GND
V
ADJ
IN
HAND SELECTED
0.1% RESISTOR
OR MECHANICAL POT
V
IN
V
OUT
ACCESS FOR
AUTOMATED
ALIGNMENT
SOT23
______________________________________________ Maxim Integrated Products
1
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.
Voltage Sample and Infinite Hold
ABSOLUTE MAXIMUM RATINGS
Voltage on V
Relative to GND...........................-0.5V to +6.0V
EEPROM Programming Adjust Temperature..........0°C to +70°C
to GND Short-Circuit Duration .........................Continuous
CC
Voltage on V , ADJ, and V
V
OUT
IN
OUT
Relative to GND ...-0.5V to (V
Operating Temperature Range ...........................-40°C to +85°C
+ 0.5V), not to exceed +6.0V
Storage Temperature Range.............................-55°C to +125°C
Soldering Temperature...See IPC/JEDEC J-STD-020 Specification
CC
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
(T = -40°C to +85°C)
A
PARAMETER
SYMBOL
CONDITIONS
MIN
2.4
0.3
-0.3
-1
TYP
MAX
3.6
UNITS
Supply Voltage
V
(Note 1)
V
V
CC
V
Voltage Range
V
V - 0.3
CC
IN
IN
ADJ Logic 0
V
0.3 x V
V
IL
CC
V
V
Current
Load
V
+1
mA
pF
OUT
OUT
OUTI
V
100
OUTL
ELECTRICAL CHARACTERISTICS
(V
CC
= +2.4 to +3.6V, T = -40°C to +85°C, unless otherwise noted.)
A
PARAMETER
SYMBOL
CONDITIONS
, ADJ and V = open circuit
MIN
TYP
MAX
UNITS
mA
kΩ
Supply Current
Resistance
I
V
1.1
1.6
CC
IN
OUT
V
R
R
95
18
IN
PD
PU
ADJ Pullup Resistance
kΩ
V
V
V
Voltage Range
Tracking Accuracy
Quantization
V
(Note 1)
(Note 2)
(Note 3)
0.3
V - 0.3
CC
V
OUT
OUT
OUT
OUTR
V
20
mV
OUTTA
V
1
mV
OUTQ
-40°C to +85°C, V
-40°C to +25°C, V
= 0.4V
= 3.0V
= 3.0V
104
+28
-13
µV/°C
OUT
V
Temperature Coefficient
V
-5
+62
+6
OUT
OUTTC
OUT
ppm/°C
+25°C to +85°C, V
-31
-4.0
OUT
V
V
Line Regulation
Load Regulation
V
V
+1.0
5.5
mV/V
mV/mA
ppm
OUT
OUT
OUTLN
OUTLD
-1mA ≤ V
≤ +1mA
OUTI
Long-Term Stability
V
1000 hours at +25°C
0.1Hz ≤ ƒ ≤ 10Hz
10Hz ≤ ƒ ≤ 1kHz
ƒ= 200kHz
TBD
200
26
OUTLTS
e
e
µV
P-P
n1
V
Noise
OUT
µV
n2
RMS
V
V
PSRR
V
21
dB
ms/V
ms
OUT
OUT
OUTPSRR
Self-Adjust Settling Time
t
ST
(Note 4)
11
15
12
10
EEPROM Programming Time
Turn-On Time
t
(Note 5)
9
W
t
V
and ADJ = open circuit (Note 6)
IN
µs
ON
ADJ Toggle Low Time
t
100
ns
ADJ
V
Factory Trimmed Value
V
+25°C, V = 3.3V (Note 7)
1200
mV
OUT
OUT FT
CC
2
_____________________________________________________________________
Voltage Sample and Infinite Hold
NONVOLATILE MEMORY CHARACTERISTICS
(V
CC
= +2.4V to 3.6V, unless otherwise noted.)
PARAMETER
Programming Cycles
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
+70°C (Note 8)
50,000
Cycles
Note 1: All voltages referenced to ground.
Note 2: Tracking accuracy is defined as V
- V after the DS4303 has completed self-adjustment.
OUT
IN
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 requires to self-adjust. The settling time is determined by the following
OUT
formula: ∆V
x t
ST
.
OUT
Note 5: EEPROM programming time is the hold time required after the DS4303 has completed self-adjustment before V or V
IN
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
to reach its specified accuracy after the required supply voltage is
OUT
applied.
Note 7: V
not loaded.
OUT
Note 8: Guaranteed by design.
Typical Operating Characteristics
(V
CC
= 3.3V, T = +25°C, unless otherwise noted.)
A
ACTIVE SUPPLY CURRENT
ACTIVE SUPPLY CURRENT
vs. TEMPERATURE (V = 3.0V)
ACTIVE SUPPLY CURRENT
vs. SUPPLY VOLTAGE
vs. TEMPERATURE (V
= 0.3V)
OUT
OUT
1.30
1.25
1.20
1.15
1.10
1.05
1.00
1.45
1.43
1.41
1.39
1.37
1.35
1.33
1.31
1.29
1.27
1.25
1.40
1.35
1.30
1.25
1.20
1.15
1.10
1.05
1.00
V
= 3.6V
CC
T
A
= +85°C
V
= 3.6V
CC
V
CC
= 3.3V
T
A
= +25°C
T
A
= -40°C
V
CC
= 3.0V
V
= 3.3V
CC
V
CC
= 2.4V
I = 0mA
L
I = 0mA
ADJ = V
I = 0mA
L
ADJ = V
CC
L
CC
-40
-15
10
35
60
85
-40
-15
10
35
60
85
2.4
2.6
2.8
3.0
3.2
3.4
3.6
TEMPERATURE (°C)
TEMPERATURE (°C)
SUPPLY VOLTAGE (V)
_____________________________________________________________________
3
Voltage Sample and Infinite Hold
Typical Operating Characteristics (continued)
= 3.3V, T = +25°C, unless otherwise noted.)
A
(V
CC
LOAD REGULATION
LOAD REGULATION
LINE REGULATION
(V = 0.3V)
(V
= 0.3V)
(V
OUT
= 3.0V)
OUT
OUT
5
4
3
2
1
0
3
2
0
-500
T
= +25°C
A
T
= +25°C
A
T
= -40°C
A
1
-1000
-1500
-2000
-2500
-3000
T
= -40°C
A
0
T
= -40°C
A
T
= +85°C
A
-1
-2
-3
-4
T
A
= +25°C
-1
-2
-3
-4
-5
T
= +85°C
A
T
A
= +85°C
V
= 3.0V
V
CC
= 3.6V
CC
I = 0mA
L
-1.0
-0.5
0
0.5
1.0
-1.0
-0.5
0
0.5
1.0
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
POWER-SUPPLY REJECTION RATIO
DS4303 OUTPUT NOISE
(0.1Hz TO 10Hz)
(V
= 3.0V)
vs. FREQUENCY (V = 3.6V)
OUT
CC
0
-50
50
45
40
35
30
25
20
300
200
100
0
V
V
= 0.3 V,
= 300mV
OUT
CC-AC
-100
-150
-200
-250
-300
-350
-400
T
A
= -40°C
T
= +25°C
A
-100
-200
-300
V = 3.0 V,
OUT
T
A
= +85°C
V
= 300mV
CC-AC
RMS
I = 0mA
L
V
CC
= 3.6V
1
V
OUT
= 3.0V
2
3.30 3.35 3.40 3.45 3.50 3.55 3.60
SUPPLY VOLTAGE (V)
10
100
1,000
0
3
4
FREQUENCY (kHz)
TIME (s)
DS4303 TURN-ON
TRANSIENT
DS4303 LOAD TRANSIENT
(V = 3.3V, V = 3.6V)
DS4303 OUTPUT NOISE
(10Hz to 1kHz)
OUT
CC
DS4303 toc12
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
6
5
4
3
2
1
0
+1mA
I
OUT
-1mA
V
CC
V
OUT
V
OUT
AC-COUPLED
200mV/div
C
OUT
=100pF
V
CC
= 3.6V
V
OUT
= 3.0V
100
1µs/div
0.2ms/div
10
1000
FREQUENCY (Hz)
4
_____________________________________________________________________
Voltage Sample and Infinite Hold
Typical Operating Characteristics (continued)
= 3.3V, T = +25°C, unless otherwise noted.)
A
(V
CC
DS4303 LINE TRANSIENT
DS4303 SHUTDOWN TRANSIENT
(V = 3.3V)
(V
= 2.0)
OUT
OUT
DS4303 toc13
DS4303 toc14
3.6V
V
CC
3.0V
500mV/div
V
OUT
V
OUT
V
CC
AC-COUPLED
200mV/div
C
OUT
= 100pF
0.2ms/div
2ms/div
DS4303 NORMALIZED V
DS4303 V
ADJUST TRANSIENT
OUT
OUT
vs. TEMPERATURE (V
= 0.4V)
(V = 3.6V, V = 3.3V)
OUT
CC
IN
DS4303 toc15
1.008
1.003
0.998
0.993
0.988
2V/div
1V/div
ADJ
V
OUT
V
CC
= 3.3V
-40
-15
10
35
60
85
5ms/div
TEMPERATURE (°C)
DS4303 NORMALIZED V
OUT
vs. TEMPERATURE (V
= 3.0V)
OUT
1.0005
1.0000
0.9995
0.9990
0.9985
0.9980
0.9975
0.9970
0.9965
V
CC
= 3.3V
10
-40
-15
35
60
85
TEMPERATURE (°C)
_____________________________________________________________________
5
Voltage Sample and Infinite Hold
Detailed Description
Pin Description
The DS4303 provides a precise, NV output voltage,
, making it an ideal solution for factory calibration
V
OUT
PIN
1
NAME
ADJ
FUNCTION
Adjust Control Input
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 with-
in 1mV. A graphical description of the DS4303 is pro-
vided in the block diagram.
2
GND
Ground
3
V
Sample Voltage Input
Voltage Output
IN
4
V
OUT
During factory calibration, a simple adjustment proce-
dure must be followed. This entire procedure includes
5
V
Power-Supply Voltage
CC
setting V , toggling ADJ, waiting as V
self-adjusts,
OUT
IN
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 V . This
IN
Block Diagram
voltage needs to be completely stable before the
adjustment procedure begins, and it must remain sta-
ble throughout the entire adjustment procedure. The
DS4303 will start its self-adjust procedure when the
V
CC
DS4303
R
PU
ADJ pin is pulled low and held low for at least t
,
ADJ
ADJ
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
V
OUT
ADC
AND
CONTROL
12-BIT
DAC
V
IN
V
CC
falling edge on ADJ and the wait time, t
, the V
ADJ
OUT
self-
R
PD
V
REF
self-adjust period begins. The length of the V
V
CC
OUT
EEPROM
GND
adjust period can be determined using the formula
∆V x t , where ∆V is | V
- V
|.
OUT NEW
ST
OUT OLD
∆V
OUT
V
OUT
∆V
OUT
∆V x t
OUT ST
∆V x t
OUT ST
V
IN
t
t
W
W
ADJ
t
t
t
ADJ
ADJ
ADJ
FIRST PROGRAMMING CYCLE
ADDITIONAL PROGRAMMING CYCLES (IF REQUIRED)
Figure 1. Timing Diagram
_____________________________________________________________________
6
Voltage Sample and Infinite Hold
AUTOMATED TEST EQUIPMENT
DEVICE UNDER TEST (DUT)
DS4303
2.4V TO 3.6V
V
CC
EEPROM
STEP 1:
SET REFERENCE
VOLTAGE
DIGITALLY
CONTROLLED
VOLTAGE SOURCE
V
IN
VOLTAGE
SAMPLE AND
INFINITE
ADJ
STEP 2:
TOGGLE ADJ
DIGITAL PIN DRIVER
HOLD
V
OUT
GND
BED-OF-NAILS
TEST
ACCESS
CIRCUITRY
REQUIRING
VOLTAGE
STEP 3:
DETERMINE IF
THE REFERENCE
VOLTAGE NEEDS
ADJUSTMENT
DIGITALLY
CONTROLLED
MEASUREMENT
PARAMETER MEASURED
DURING CALIBRATION
ADJUSTMENT
Figure 2. Application Circuit
During the V
self-adjust period, the DS4303 inter-
circuit. V
can be readjusted at any time by following
OUT
OUT
nally adjusts the onboard DAC until V
matches V .
the same procedure. The closed-loop nature of the
adjustment process removes all the system inaccura-
cies such as resistor tolerances, amplifier offsets, gain
mismatches, and even the inaccuracies in the automat-
ed equipment that provides the reference voltage.
OUT
IN
After V
has stabilized to within the tracking accura-
OUT
cy, V
, of V , it will be automatically stored in
IN
OUTTA
EEPROM. The storage period lasts for the duration of
the EEPROM write time, t . After the first adjustment
W
procedure has completed, V
can be measured,
OUT
Typical Operating Circuit
The typical operating circuit shows an example of how
the DS4303 can replace most existing calibration solu-
tions. Many power supplies use a shunt voltage refer-
ence to provide the internal reference voltage, and
fine-tune adjustments are often made with hand-select-
ed discrete resistors. The DS4303 replaces this cum-
bersome 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 inven-
tory costs, and a quicker time-to-market.
and if necessary V can be readjusted and the entire
IN
adjustment procedure can be repeated to fine-tune
V
within the V
range.
OUTQ
OUT
Following each self-adjust procedure, V
indefinitely, even if the DS4303 is power cycled.
is saved
OUT
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 V pin, (2) control the
IN
ADJ input, and (3) sense the needed feedback para-
meter. During manufacture, an automated test proce-
dure adjusts V
by changing V , until the feedback
IN
OUT,
parameter is optimized. After the bed-of-nails operation
is complete, both the V and ADJ inputs are left open
IN
_____________________________________________________________________
7
Voltage Sample and Infinite Hold
Layout Considerations
Chip Topology
To prevent an inadvertent programming cycle from
TRANSISTOR COUNT: 6001
occurring during power-up, minimize capacitive load-
ing 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.
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 0.01µF
or 0.1µF. Use a high-quality, ceramic, surface-mount
Package Information
For the latest package outline information, go to
www.maxim-ic.com/DallasPackInfo.
capacitor, and mount it as close as possible to the V
and GND pins of the IC to minimize lead inductance.
CC
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
© 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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