DS4402 Datasheet PDF - Dallas Semiconducotr
| Part Number | DS4402 | |
| Description | (DS4402 / DS4404) I2C Adjustable Current DAC | |
| Manufacturers | Dallas Semiconducotr | |
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Rev 0; 4/06
Two/Four-Channel, I2C Adjustable Current DAC
General Description
The DS4402 and DS4404 contain two and four I2C*
adjustable current DACs, respectively, that are each
capable of sinking or sourcing current. Each output has
31 sink and 31 source settings that are programmed by
the I2C interface. External resistors set the full-scale
range and step size of each output.
Applications
Power-Supply Adjustment
Power-Supply Margining
Adjustable Current Sink or Source
Pin Configuration
TOP VIEW
SDA 1
SCL 2
GND
FS3
(N.C.)
FS2
(N.C.)
FS1
3
4
5
6
FS0 7
DS4404/
DS4402
14
OUT3
(N.C.)
13 VCC
12
OUT2
(N.C.)
11 A1
10 OUT1
9 A0
8 OUT0
TDFN
(3mm x 3mm x 0.8mm)
( ) INDICATES FOR DS4402 ONLY.
Features
o Two (DS4402) or Four (DS4404) Current DACs
o Full-Scale Range for Each DAC Determined by
External Resistors
o 31 Settings Each for Sink and Source Modes
o I2C-Compatible Serial Interface
o Two Three-Level Address Pins Allow Nine
Devices on Same I2C Bus
o Low Cost
o Small Package (14-Pin TDFN)
o -40°C to +85°C Temperature Range
o 1.7V to 5.5V Operation
Ordering Information
PART
TEMP RANGE
DS4402N+
-40°C to +85°C
DS4402N+T&R -40°C to +85°C
DS4404N+
-40°C to +85°C
DS4404N+T&R -40°C to +85°C
+Denotes lead-free package.
T&R denotes tape-and-reel package.
PIN-PACKAGE
14 TDFN (3mm x 3mm)
14 TDFN (3mm x 3mm)
14 TDFN (3mm x 3mm)
14 TDFN (3mm x 3mm)
Typical Operating Circuit
4.7kΩ
4.7kΩ
SDA
SCL
A1
A0
GND
VCC
DS4402 OUT0
OUT1
VCC VOUT0
OUT
DC/DC
CONVERTER
FB
R0A
R0B
VOUT1
OUT
DC/DC
CONVERTER
FB
R1A
R1B
FS0 FS1
RFS0 RFS1
*Purchase of I2C components from Maxim Integrated Products, Inc., or one of its sublicensed Associated Companies, conveys a
license under the Philips I2C Patent Rights to use these components in an I2C system, provided that the system conforms to the I2C
Standard Specification as defined by Philips.
______________________________________________ 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.
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Two/Four-Channel, I2C Adjustable Current DAC
Detailed Description
The DS4402/DS4404 contain two/four I2C adjustable
current sources (Figure 1) that are each capable of
sinking and sourcing current. Each output has 31 sink
and 31 source settings that are programmed through
the I2C interface. The full-scale ranges (and corre-
sponding step sizes) of the outputs are determined by
external resistors that adjust the output currents over a
4:1 range. The formula to determine the external resis-
tor values (RFS) for each of the outputs is given by:
Equation 1:
RFS = (VREF / IFS) x (31 / 4)
where IFS = desired full-scale current
On power-up, the DS4402/DS4404 output zero current.
This is done to prevent it from sinking or sourcing an
incorrect current before the system host controller has
had a chance to modify the device’s setting.
As a source for biasing instrumentation or other cir-
cuits, the DS4402/DS4404 provide a simple and inex-
pensive current source with an I2C interface for control.
The adjustable full-scale range allows the application to
get the most out of its 5-bit sink or source resolution.
When used in adjustable power-supply applications
(see the Typical Operating Circuit), the DS4402/DS4404
do not affect the initial power-up supply voltage because
it defaults to providing zero output current on power-up.
As it sources or sinks current into the feedback voltage
node, it changes the amount of output voltage required
by the regulator to reach its steady state operating point.
By using the external resistor to set the output current
range, the devices provide flexibility for adjusting the
impedances of the feedback network or the range over
which the power supply can be controlled or margined.
I2C Slave Address
The DS4402/DS4404 respond to one of nine I2C slave
addresses determined by the two tri-level address
inputs. The three input states are connected to VCC,
connected to ground, or disconnected. To sense the
disconnected state (Figure 2), the address inputs have
weak internal resistors that pull the pins to mid-supply.
VCC
RIN
A1
A0
RIN
RIN
I2C
ADDRESS
DECODE
RIN
Figure 2. I2C Address Inputs
Table 1 lists the slave address determined by the
address input combinations.
Table 1. Slave Addresses
A1
GND
GND
VCC
VCC
N.C.
N.C.
GND
VCC
N.C.
A0
GND
VCC
GND
VCC
GND
VCC
N.C.
N.C.
N.C.
SLAVE ADDRESS
(HEXADECIMAL)
90h
92h
94h
96h
98h
9Ah
9Ch
9Eh
A0h
_____________________________________________________________________ 5
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| Part Number | Description | MFRS |
| DS4402 | The function is (DS4402 / DS4404) I2C Adjustable Current DAC. Dallas Semiconducotr | |
| DS4404 | The function is (DS4402 / DS4404) I2C Adjustable Current DAC. Dallas Semiconducotr | |
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