General Description
The DS4302 is a 5-bit digital-to-analog converter (DAC)
with three programmable digital outputs. The DS4302
communicates through a 2-wire, SMBusTM-compatible,
serial interface. The tiny 8-pin SOP package is ideal
for use in space-constrained applications.
Applications
CCFL Backlight Brightness Control
Power-Supply Calibration
Features
SO Package is a Drop-In Replacement for the
MPS1251 and MPS1252
Single 5-Bit DAC (32 Steps)
0V to 2V and 0V to 1.9V Versions
Three Programmable Digital Outputs
SMBus-Compatible Serial Interface
4.5V to 5.5V Supply Voltage Range
8-Pin SO and 8-Pin SOP Packages
Industrial Temperature Range: -40C to +85C
DS4302
2-Wire, 5-Bit DAC with Three Digital Outputs
______________________________________________ Maxim Integrated Products
1
TOP VIEW
P1
P2
GND
1
2
8
7
V
CC
P0
SDA
V
OUT
SCL
SO/SOP
3
4
6
5
DS4302
Pin Configuration
Ordering Information
Rev 1; 6/04
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.
Add "/T&R" for tape-and-reel orders.
*Contact factory for availability.
SMBus is a trademark of Intel Corp.
PART
V
OUT
RANGE
TOP
BRAND
PIN-
PACKAGE
DS4302Z-020
0V to 2.0V
4302B
8 SO
DS4302Z-019*
0V to 1.9V
4302A
8 SO
DS4302U-020
0V to 2.0V
4302B
8 SOP
DS4302U-019*
0V to 1.9V
4302A
8 SOP
Pin Description
PIN
NAME
FUNCTION
1
SCL
Serial Clock Input. 2-wire clock input.
2
SDA
Serial Data Input/Output. Bidirectional,
2-wire data pin.
3
V
OUT
DAC Output Voltage
4
GND
Ground
5
P2
6
P1
7
P0
Programmable Digital Output
8
V
CC
Power-Supply Input
DS4302
2-Wire, 5-Bit DAC with Three Digital Outputs
2
_____________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
RECOMMENDED DC 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 Range on V
CC
, SDA, and SCL Pins
Relative to Ground.............................................-0.5V to +6.0V
Operating Temperature Range ...........................-40C to +85C
Storage Temperature Range .............................-55C to +125C
Soldering Temperature.....See IPC/JEDEC J-STD-020A Specification
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Supply Voltage
V
CC
(Note 1)
4.5
5.5
V
Input Logic 1 (SDA, SCL)
V
IH
2.0
V
CC
+ 0.3
V
Input Logic 0 (SDA, SCL)
V
IL
GND - 0.3
0.8
V
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Standby Current
I
STBY
(Notes 2, 3)
200
300
A
Input Leakage
I
L
(Note 4)
-1.0
+1.0
A
3mA sink current
0.0
0.4
SDA Low-Level Output Voltage
V
OL1
6mA sink current
0.0
0.6
V
P0, P1, P2 Low-Level Output
Voltage
V
OL2
(Note 1)
4mA sink
+0.4V
V
P0, P1, P2 High-Level Output
Voltage
V
OH
(Note 1)
4mA source
V
CC
- 0.4V
V
V
OUT
Maximum Level (-020)
V
CC
= 5.0V, Data = 00000XXX (Note 3)
1.925
2.0
2.075
V
V
OUT
Minimum Level (-020)
V
CC
= 5.0V, Data = 11111XXX
0.0
0.05
0.1
V
V
OUT
Maximum Level (-019)
V
CC
= 5.0V, Data = 00000XXX (Note 3)
1.825
1.9
1.975
V
V
OUT
Minimum Level (-019)
V
CC
= 5.0V, Data = 11111XXX
0.0
0.05
0.1
V
Power-On Reset
1.7
V
Settling Time
10
s
D/A Output Levels
32
steps
DC ELECTRICAL CHARACTERISTICS
(V
CC
= +4.5V to 5.5V, T
A
= -40C to +85C.)
X = Don't care.
DS4302
2-Wire, 5-Bit DAC with Three Digital Outputs
_____________________________________________________________________
3
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
SCL Clock Frequency
f
SCL
0
400
kHz
Bus Free Time Between STOP
and START Conditions
t
BUF
1.3
s
Low Period of SCL
t
LOW
1.3
s
High Period of SCL
t
HIGH
0.6
s
Data Hold Time
t
HD:DAT
0
0.9
s
Data Setup Time
t
SU:DAT
100
ns
Start Setup Time
t
SU:STA
0.6
s
SDA and SCL Rise Time
t
R
(Note 5)
20 + 0.1C
B
300
ns
SDA and SCL Fall Time
t
F
(Note 5)
20 + 0.1C
B
300
ns
Stop Setup Time
t
SU:STO
0.6
s
SDA and SCL Capacitive
Loading
C
B
(Note 5)
400
pF
AC ELECTRICAL CHARACTERISTICS (Figure 3)
(V
CC
= +4.5V to 5.5V, T
A
= -40C to +85C, timing referenced to V
IL(MAX)
and V
IH(MIN)
.)
Note 1: All voltages referenced to ground.
Note 2: I
STBY
specified for the inactive state measured with SDA = SCL = V
CC
and with V
OUT
, P0, P1, and P2 floating.
Note 3: No load on V
OUT
.
Note 4: The DS4302 will not obstruct the SDA and SCL lines if V
CC
is switched off as long as the voltages applied to these inputs
does not violate their min and max input-voltage levels.
Note 5: C
B
--total capacitance of one bus line in picofarads.
DS4302
2-Wire, 5-Bit DAC with Three Digital Outputs
4
_____________________________________________________________________
Typical Operating Characteristics
(V
CC
= +5.0V, T
A
= +25C.)
STANDBY SUPPLY CURRENT
vs. SUPPLY VOLTGE
DS4302 toc01
SUPPLY VOLTAGE (V)
STANDBY SUPPLY CURRENT (
A)
5.25
5.00
4.75
50
100
150
200
250
300
0
4.50
5.50
OUTPUTS UNLOADED
SDA = SCL = V
CC
STANDBY SUPPLY CURRENT
vs. TEMPERATURE
DS4302 toc02
TEMPERATURE (C)
STANDBY SUPPLY CURRENT (
A)
20
40
60
0
-20
50
100
150
200
250
300
0
-40
80
OUTPUTS UNLOADED
SDA = SCL = V
CC
= 5.0V
SUPPLY CURRENT
vs. SCL FREQUENCY
DS4302 toc03
SCL FREQUENCY (kHz)
SUPPLY CURRENT (
A)
300
200
100
50
100
150
200
250
300
0
0
400
OUTPUTS UNLOADED
SDA = V
CC
V
OUT
vs. DAC SETTING
DS4302 toc04
DAC SETTING (dec)
V
OUT
(V)
30
25
20
15
10
5
0.5
1.0
1.5
2.0
0
0
DS4302-020 VERSION
V
OUT
vs. SUPPLY VOLTAGE
DS4302 toc05
SUPPLY VOLTAGE (V)
V
OUT
(V)
5.25
5.00
4.75
1.95
2.00
2.05
2.10
1.90
4.50
5.50
V
CC
= SDA = SCL
V
OUT
PERCENT CHANGE FROM +25C
vs. TEMPERATURE
DS4302 toc06
TEMPERATURE (C)
V
OUT
PERCENT CHANGE (%)
80
60
40
20
0
-20
-0.5
0
0.5
1.0
-1.0
-40
V
CC
= SDA = SCL
DS4302
2-Wire, 5-Bit DAC with Three Digital Outputs
_____________________________________________________________________
5
Functional Diagram
2-WIRE
INTERFACE
GND
5-BIT
DAC
V
OUT
BANDGAP
REFERENCE
SCL
SDA
MSB
LSB
DATA BYTE REGISTER
DAC VALUE
P0
P2 P1
P0
V
CC
V
CC
OUTPUT CELL
P1
P2
V
CC
OUTPUT CELL
OUTPUT CELL
BUFFER
DS4302
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