Maxim MAX5384EZT-T Low-cost, low-power, 8-bit dacs with 3-wire serial interface in sot23 Datasheet

19-1718; Rev 2; 1/02
Low-Cost, Low-Power, 8-Bit DACs with 3-Wire
Serial Interface in SOT23
Features
♦ 8-Bit Resolution in a Miniature 6-Pin SOT23
Package
♦ Wide +2.7V to +5.5V Supply Range (MAX5385)
♦ <1µA Shutdown Mode
♦ Software-Selectable Output Resistance During
Shutdown
♦ Buffered Output Drives Resistive Loads
♦ Low-Glitch Power-On Reset to Zero DAC Output
♦ 3-Wire SPI/QSPI/MICROWIRE-Compatible Interface
♦ < ±5% Full-Scale Error (MAX5385)
♦ < ±1LSB max INL/DNL
♦ Low 230µA (max) Supply Current
Ordering Information
PART
Applications
TEMP RANGE
PINPACKAGE
SOT
TOP MARK
MAX5383EUT-T -40°C to +85°C
6 SOT23
AADF
Automatic Tuning (VCO)
MAX5383EZT-T
6 SOT23-Thin
AAAH
Power Amplifier Bias Control
MAX5384EUT-T -40°C to +85°C
6 SOT23
AADH
Programmable Threshold Levels
MAX5384EZT-T
6 SOT23-Thin
AAAI
Automatic Gain Control
MAX5385EUT-T -40°C to +85°C
6 SOT23
AADJ
MAX5385EZT-T
6 SOT23-Thin
AAAJ
Automatic Offset Adjustment
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
Selector Guide
SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
PART
INTERNAL REFERENCE
MAX5383
2V
MAX5384
4V
MAX5385
0.9 ✕ VDD
Typical Operating Circuit
+2.7V TO +5.5V
Pin Configuration
TOP VIEW
OUT 1
PCS0
MOSI
SCK
GND
6 CS
VDD
MC68XXXX
CS
DIN
SCLK
MAX5385
OUT
GND 2
MAX5383
MAX5384
MAX5385
VDD 3
5
SCLK
4
DIN
SOT23
________________________________________________________________ Maxim Integrated Products
1
For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
MAX5383/MAX5384/MAX5385
General Description
The MAX5383/MAX5384/MAX5385 low-cost, 8-bit digitalto-analog converters (DACs) in miniature 6-pin SOT23
packages have a simple 3-wire, SPI™/QSPI™/
MICROWIRE™-compatible serial interface that operates
up to 10MHz. The MAX5383 has an internal +2V reference and operates from a +2.7V to +3.6V supply. The
MAX5384 has an internal +4V reference and operates
from a +4.5V to +5.5V supply. The MAX5385 operates
over the full +2.7V to +5.5V supply range and has an
internal reference equal to 0.9 ✕ VDD.
The MAX5383/MAX5384/MAX5385 require an extremely
low supply current of only 150µA (typ) and provide a
buffered voltage output. These devices power up at zero
code and remain there until a new code is written to the
DAC registers. This provides additional safety for applications that drive valves or other transducers that need
to be off on power-up. The MAX5383/MAX5384/
MAX5385 include a 1µA, low-power shutdown mode that
features software-selectable output loads of 1kΩ, 100kΩ,
or 1MΩ to ground.
MAX5383/MAX5384/MAX5385
Low-Cost, Low-Power, 8-Bit DACs with 3-Wire
Serial Interface in SOT23
ABSOLUTE MAXIMUM RATINGS
VDD to GND ..............................................................-0.3V to +6V
OUT ............................................................-0.3V to (VDD + 0.3V)
CS, SCLK, DIN to GND ............................................-0.3V to +6V
Maximum Current into Any Pin............................................50mA
Continuous Power Dissipation (TA = +70°C)
6-Pin SOT23 (derate 8.7mW/°C above +70°C)..........696mW
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Maximum Junction Temperature .....................................+150°C
Lead Temperature (soldering, 10s) .................................+300°C
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.
ELECTRICAL CHARACTERISTICS
(VDD = +2.7V to +3.6V (MAX5383), VDD = +4.5V to +5.5V (MAX5384), VDD = +2.7V to +5.5V (MAX5385), RL = 10kΩ, CL = 50pF,
TA = TMIN to TMAX, unless otherwise noted. Typical values are TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
±1
LSB
STATIC ACCURACY
Resolution
8
Integral Linearity Error
INL
Differential Linearity Error
DNL
Guaranteed monotonic
Offset Error
VOS
(Note 2)
Bits
(Note 1)
±1
Offset Error Supply Rejection
MAX5385 (Notes 2, 3)
Offset Error Temperature
Coefficient
MAX5383/MAX5384
3
MAX5385
1
Full-Scale Error
Code = 255, no load
Full-Scale Error Supply
Rejection
Code = 255 (Note 4)
Full-Scale Error Temperature
Coefficient
Code = 255
±1
LSB
±25
mV
60
dB
ppm/ °C
MAX5383/MAX5384
10
MAX5385
5
% of
ideal FS
MAX5383/MAX5384
50
dB
MAX5383/MAX5384
±40
MAX5385
±10
ppm/ °C
DAC OUTPUT
Internal Reference Voltage
(Note 5)
Output Load Regulation
Shutdown Output Resistance
to GND
REF
MAX5383
1.8
2
2.2
MAX5384
3.6
4
4.4
MAX5385
0.85 ×
VDD
0.9 ×
VDD
0.95 ×
VDD
Code = 255, 0µA to 100µA
0.5
Code = 0, 0µA to 100µA
0.5
VOUT = 0 to V DD
[D13, D12] = 0, 1
1k
[D13, D12] = 1, 0
100k
[D13, D12] = 1, 1
1M
V
LSB
Ω
DYNAMIC PERFORMANCE
Voltage Output Slew Rate
Positive and negative
0.4
V/µs
Output Settling Time
To 1/2 LSB, 50kΩ and 50pF load (Note 6)
20
µs
Digital Feedthrough
Code = 0, all digital inputs from 0 to V DD
2
nVs
2
_______________________________________________________________________________________
Low-Cost, Low-Power, 8-Bit DACs with 3-Wire
Serial Interface in SOT23
(VDD = +2.7V to +3.6V (MAX5383), VDD = +4.5V to +5.5V (MAX5384), VDD = +2.7V to +5.5V (MAX5385), RL = 10kΩ, CL = 50pF,
TA = TMIN to TMAX, unless otherwise noted. Typical values are TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Digital-Analog Glitch Impulse
Code 127 to 128
40
nVs
Wake-Up Time
From software shutdown
50
µs
POWER REQUIREMENTS
Supply Voltage
VDD
Supply Current
IDD
MAX5383
2.7
3.6
MAX5384
4.5
5.5
MAX5385
2.7
5.5
No load, all digital inputs at 0 or V DD ,
code = 255
150
Shutdown mode
230
V
µA
1
DIGITAL INPUTS
Input Low Voltage
VIL
Input High Voltage
VIH
Input Hysteresis
VH
Input Capacitance
CIN
Input Leakage Current
IIN
0.3 ×
VDD
0.7 ×
V DD
V
0.05 ×
VDD
(Note 7)
V
V
10
pF
±1
µA
TIMING CHARACTERISTICS
(Figures 3 and 4, VDD = +2.7V to +3.6V (MAX5383), VDD = +4.5V to +5.5V (MAX5384), VDD = +2.7V to +5.5V (MAX5385),
RL = 10kΩ, CL = 50pF, TA = TMIN to TMAX, unless otherwise noted. Typical values are TA = +25°C.) (Note 7)
PARAMETER
SCLK Period
SCLK Pulse Width High
SYMBOL
tCP
tCH
CONDITIONS
MIN
100
40
TYP
MAX
UNITS
ns
ns
SCLK Pulse Width Low
tCL
40
ns
CS Fall to SCLK Rise Setup
Time
tCSS
40
ns
SCLK Rise to CS Rise Hold
Time
tCSH
0
ns
DIN Setup Time
tDS
40
ns
DIN Hold Time
tDH
0
ns
SCLK Rise to CS Fall Delay
tCS0
10
ns
_______________________________________________________________________________________
3
MAX5383/MAX5384/MAX5385
ELECTRICAL CHARACTERISTICS (continued)
TIMING CHARACTERISTICS (continued)
(Figures 3 and 4, VDD = +2.7V to +3.6V (MAX5383), VDD = +4.5V to +5.5V (MAX5384), VDD = +2.7V to +5.5V (MAX5385),
RL = 10kΩ, CL = 50pF, TA = TMIN to TMAX, unless otherwise noted. Typical values are TA = +25°C.) (Note 7)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
CS Rise to SCLK Rise Hold
tCS1
40
ns
CS Pulse Width High
tCSW
100
ns
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
Note 6:
Note 7:
Guaranteed from code 5 to code 255.
The offset value extrapolated from the range over which the INL is guaranteed.
MAX5385 tested at 5V ±10%.
MAX5383 tested at 3V ±10%; MAX5384 tested at 5V ±10%.
Actual output voltages at full-scale are 255/256 ✕ VREF.
Output settling time is measured by stepping from code 5 to code 255, and from code 255 to code 5.
Guaranteed by design.
Typical Operating Characteristics
(VDD = +3.0V (MAX5383), VDD = +5.0V (MAX5384/MAX5385), TA = +25°C, unless otherwise noted.)
INL (LSB)
0
-0.025
INL (LSB)
-0.05
0.025
INL (LSB)
MAX5383/4/5-03
0.050
0
MAX5383/4/5-02
0
MAX5383/4/5-01
0.075
INTEGRAL NONLINEARITY
vs. TEMPERATURE
INTEGRAL NONLINEARITY
vs. SUPPLY VOLTAGE
INTEGRAL NONLINEARITY vs. CODE
-0.10
-0.025
-0.050
-0.15
-0.075
-0.100
-0.050
-0.20
0
50
100
150
200
250
300
2.5
3.0
3.5
4.0
4.5
5.0
-40
5.5
-20
0
20
40
60
80
CODE
SUPPLY VOLTAGE (V)
TEMPERATURE (°C)
DIFFERENTIAL NONLINEARITY vs. CODE
DIFFERENTIAL NONLINEARITY
vs. SUPPLY VOLTAGE
DIFFERENTIAL NONLINEARITY
vs. TEMPERATURE
DNL (LSB)
0
-0.005
-0.010
-0.015
100
MAX5383/4/5-06
-0.005
-0.005
DNL (LSB)
0.005
0
MAX5383/4/5-05
0
MAX5383/4/5-04
0.010
DNL (LSB)
MAX5383/MAX5384/MAX5385
Low-Cost, Low-Power, 8-Bit DACs with 3-Wire
Serial Interface in SOT23
-0.010
-0.015
-0.010
-0.020
-0.025
-0.025
0
100
200
CODE
4
-0.020
-0.020
-0.015
300
2.5
3.0
3.5
4.0
4.5
SUPPLY VOLTAGE (V)
5.0
5.5
-40
-20
0
20
40
60
TEMPERATURE (°C)
_______________________________________________________________________________________
80
100
Low-Cost, Low-Power, 8-Bit DACs with 3-Wire
Serial Interface in SOT23
TOTAL UNADJUSTED ERROR vs. CODE
MAX5383/4/5-09
0
MAX5383/4/5-08
0.10
OFFSET ERROR vs. TEMPERATURE
OFFSET ERROR vs. SUPPLY VOLTAGE
0
MAX5383/4/5-07
0.15
-0.05
VOS (mV)
VOS (mV)
0
-0.25
-0.25
-0.10
-0.15
-0.50
-0.50
200
300
2.5
3.0
CODE
3.5
4.0
4.5
FULL-SCALE ERROR vs. SUPPLY VOLTAGE
-20
0
0.50
MAX5383
0.25
0.75
0.8
0.50
0.4
MAX5385
0
0
-0.25
-0.4
-0.50
-0.75
3.0
3.5
4.0
4.5
5.0
FULL-SCALE ERROR (LSB)
MAX5384
MAX5383/4/5-11
40
60
80
100
1.2
0.8
MAX5383
MAX5384
0.25
0.4
0
0
MAX5385
-0.25
-0.4
-0.8
-0.50
-0.8
-1.2
5.5
-0.75
-40
-20
SUPPLY VOLTAGE (V)
0
20
40
60
80
-1.2
100
TEMPERATURE (°C)
SUPPLY CURRENT vs. TEMPERATURE
SUPPLY CURRENT vs. SUPPLY VOLTAGE
180
MAX5384
140
MAX5385
100
80
60
40
NO LOAD
155
SUPPLY CURRENT (µA)
MAX5383
160
MAX5383/4/5-12
200
120
20
TEMPERATURE (°C)
FULL-SCALE ERROR vs. TEMPERATURE
1.2
FULL-SCALE ERROR (%)
MAX5383/4/5-10
160
-40
5.5
SUPPLY VOLTAGE (V)
0.75
2.5
5.0
MAX5383/4/5-13
100
FULL-SCALE ERROR (LSB)
0
FULL-SCALE ERROR (%)
-0.20
SUPPLY CURRENT (µA)
TUE (LSB)
0.05
MAX5384
150
145
MAX5385
140
MAX5383
135
20
130
0
2.5
3.0
3.5
4.0
4.5
SUPPLY VOLTAGE (V)
5.0
5.5
-40
-20
0
20
40
60
80
100
TEMPERATURE (°C)
_______________________________________________________________________________________
5
MAX5383/MAX5384/MAX5385
Typical Operating Characteristics (continued)
(VDD = +3.0V (MAX5383), VDD = +5.0V (MAX5384/MAX5385), TA = +25°C, unless otherwise noted.)
Typical Operating Characteristics (continued)
(VDD = +3.0V (MAX5383), VDD = +5.0V (MAX5384/MAX5385), TA = +25°C, unless otherwise noted.)
145
140
MAX5383
VDD = +5V
135
MAX5383
VDD = +3V
0.6
0.4
32
64
96
128 160 192 224
256
2.5
CODE
OUTPUT LOAD REGULATION
MAX5383/4/5-17
3.0
3.5
4.0
4.5
5.0
VDD = +3V
-40
5.5
-20
0
40
60
TEMPERATURE (°C)
OUTPUT VOLTAGE ON POWER-UP
MAX5383
OUTPUT VOLTAGE
EXITING SHUTDOWN
OUT
50mV/div
3.0
80
100
MAX5383/4/5-19
3.5
OUT
500mV/div
2.5
C
0.2
D
E
0.1
0
0
1
2
3
4
5
6
7
8
9
VOUT ZERO CODE (V)
B
2.0
1.5
VDD
2V/div
CS
3V/div
10
4µs/div
10µs/div
LOAD CURRENT (mA)
SHDN TO 0 x 80
MAX5383
OUTPUT SETTLING FROM
3/4FS TO 1/4FS
MAX5383/4/5-21
MAX5383
OUTPUT SETTLING FROM
1/4FS TO 3/4FS
MAX5383/4/5-20
A: MAX5384/MAX5385, VDD = +4.5V, FULL SCALE OR SOURCING
B: MAX5383, FULL SCALE, VDD = +2.7V SINKING, VDD = +5.0V SOURCING
C: MAX5383, FULL SCALE, VDD = +2.7V SOURCING
D: ZERO CODE, VDD = +2.7V SINKING
E: ZERO CODE, VDD = +5.5V SINKING
OUT
0.5V/div
OUT
0.5V/div
CS
3V/div
CS
3V/div
1µs/div
6
20
SUPPLY VOLTAGE (V)
A
4.0
VDD = +5V
0.4
MAX5383/4/5-18
4.5
0.6
0
0
0
0.8
0.2
0.2
130
MAX5383/4/5-16
MAX5383/4/5-15
0.8
150
1.0
SUPPLY CURRENT (µA)
MAX5385
VDD = +5V
SUPPLY CURRENT (µA)
SUPPLY CURRENT (µA)
155
1.0
MAX5383/4/5-14
160
MAX5384
VDD = +5V
SHUTDOWN SUPPLY CURRENT
vs. TEMPERATURE
SHUTDOWN SUPPLY CURRENT
vs. SUPPLY VOLTAGE
SUPPLY CURRENT vs. CODE
VOUT FULL SCALE (V)
MAX5383/MAX5384/MAX5385
Low-Cost, Low-Power, 8-Bit DACs with 3-Wire
Serial Interface in SOT23
_______________________________________________________________________________________
1µs/div
Low-Cost, Low-Power, 8-Bit DACs with 3-Wire
Serial Interface in SOT23
MAX5383
OUTPUT SETTLING
1LSB STEP UP
MAX5383/4/5-23
MAX5383/4/5-22
MAX5383
OUTPUT SETTLING
1LSB STEP DOWN
OUT
20mV/div
AC-COUPLED
OUT
20mV/div
AC-COUPLED
CS
3V/div
CS
3V/div
2µs/div
2µs/div
0 x 7F TO 0 x 80
0 x 80 TO 0 x 7F
Pin Description
PIN
NAME
DESCRIPTION
1
OUT
DAC Voltage Output
2
GND
Ground
3
VDD
Power-Supply Input
4
DIN
Serial Data Input
5
SCLK
Serial Clock Input
6
CS
Chip-Select Input
Detailed Description
The MAX5383/MAX5384/MAX5385 voltage-output, 8-bit
DACs ensure monotonic performance by offering full 8bit performance with less than 1LSB integral nonlinearity error and less than 1LSB differential nonlinearity
error. The devices use a simple 3-wire, SPI/QSPI/
MICROWIRE-compatible serial interface that operates
up to 10MHz. They include an internal reference, an
output buffer, and three low-current shutdown modes,
making these devices ideal for low-power, highly integrated applications. Figure 1 shows the devices’ functional diagram.
Analog Section
The MAX5383/MAX5384/MAX5385 employ a currentsteering DAC topology as shown in Figure 2. At the
core of the DAC is a reference voltage-to-current converter (V/I) that generates a reference current. This current is mirrored to 255 equally weighted current
sources. DAC switches control the outputs of these current mirrors so that only the desired fraction of the total
current-mirror currents is steered to the DAC output.
The current is then converted to a voltage across a
resistor, and this voltage is buffered by the output
buffer amplifier.
Output Voltage
Table 1 shows the relationship between the DAC code
and the analog output voltage. The 8-bit DAC code is
binary unipolar with 1LSB = (VREF/256). The MAX5383/
MAX5384 have a full-scale output voltage of (+2V - 1LSB)
and (+4V - 1LSB), set by the internal references. The
MAX5385 has a full-scale output voltage of (0.9 ✕ VDD 1LSB).
Output Buffer
The DAC voltage output is an internally buffered unitygain follower that slews up to ±0.4V/µs. The output can
swing from 0 to full scale. With a 1/4FS to 3/4FS output
transition, the amplifier outputs typically settle to
1/2LSB in less than 5µs when loaded with 10kΩ in parallel with 50pF. The buffer amplifiers are stable with any
_______________________________________________________________________________________
7
MAX5383/MAX5384/MAX5385
Typical Operating Characteristics (continued)
(VDD = +3.0V (MAX5383), VDD = +5.0V (MAX5384/MAX5385), TA = +25°C, unless otherwise noted.)
MAX5383/MAX5384/MAX5385
Low-Cost, Low-Power, 8-Bit DACs with 3-Wire
Serial Interface in SOT23
VDD
OUT
CURRENT-STEERING
DAC
REF
255
MAX5383
MAX5384
MAX5385
DATA LATCH
CS
CONTROL LOGIC
DIN
8
SCLK
SERIAL INPUT REGISTER
GND
Figure 1. Functional Diagram
combination of resistive loads >10kΩ and capacitive
loads <50pF.
Power-On Reset
The MAX5383/MAX5384/MAX5385 have a power-on
reset circuit to set the DAC’s output to 0 when VDD is
first applied or when VDD dips below 1.7V (typ). This
ensures that unwanted DAC output voltages will not
occur immediately following a system startup, such as
after a loss of power. The output glitch on startup is typically less than 50mV.
VREF
SW1
SW2
SW255
OUT
Figure 2. Current-Steering DAC Topology
Table 1. Unipolar Code Output Voltage
Digital Section
OUTPUT VOLTAGE
DAC CODE
[D11–D4]
1111 1111
8
Shutdown Mode
The MAX5383/MAX5384/MAX5385 include three software-controlled shutdown modes that reduce the supply
current to <1µA. All internal circuitry is disabled, and a
known impedance is placed from OUT to GND to
ensure 0V while in shutdown. Table 2 details the three
shutdown modes of operation.
3-Wire Serial Interface
MAX5383
MAX5384
MAX5385
2V ×
(255/256)
4V ×
(255/256)
0.9 × V DD ×
(255/256)
1000 0000
1V
2V
0.9 × V DD / 2
0000 0001
7.8mV
15.6mV
0.9 × V DD / 256
0000 0000
0
0
0
The MAX5383/MAX5384/MAX5385s’ digital interface is
a standard 3-wire connection compatible with
SPI/QSPI/MICROWIRE interfaces. The chip-select input
(CS) frames the serial data loading at the data-input pin
(DIN). Immediately following CS’s high-to-low transition,
the data is shifted synchronously and latched into the
input register on the rising edge of the serial clock input
(SCLK). After 16 bits have been loaded into the serial
_______________________________________________________________________________________
Low-Cost, Low-Power, 8-Bit DACs with 3-Wire
Serial Interface in SOT23
Applications Information
Device Powered by an External Reference
Since the MAX5385 generates an output voltage proportional to VDD, a noisy power supply will affect the
accuracy of the on-board reference, thereby affecting
the overall accuracy of the DAC. The circuit in Figure 5
rejects this power-supply noise by powering the device
directly with a precision voltage reference, improving
overall system accuracy. The MAX6103 (+3V, 75ppm)
or the MAX6105 (+5V, 75ppm) precision voltage references are ideal choices due to the low power requirements of the MAX5385. This solution is also useful
when the required full-scale output voltage is different
from the available supply voltages.
Digital Inputs and Interface Logic
The digital interface for the 8-bit DAC is based on a
3-wire standard that is compatible with SPI, QSPI, and
MICROWIRE interfaces. The three digital inputs (CS, DIN,
and SCLK) load the digital input serially into the DAC.
All the digital inputs include Schmitt-trigger buffers to
accept slow-transition interfaces. This means that optocouplers can interface directly to the MAX5383/
MAX5384/MAX5385 without additional external logic.
The digital inputs are compatible with CMOS logic levels
and can be driven with voltages up to +5.5V regardless
of the supply voltage.
Power-Supply Bypassing and Layout
Careful PC board layout is important for best system
performance. To reduce crosstalk and noise injection,
keep analog and digital signals separate. To ensure
that the ground return from GND to the supply ground
is short and low impedance, a ground plane is recommended. Bypass VDD with a 0.1µF capacitor to ground
as close as possible to the device. If the supply is
excessively noisy, connect a 10Ω resistor in series with
the supply and VDD and add additional capacitance.
Table 2. Shutdown Modes
DAC CODE
[D13 AND D12]
MODE
OUTPUT RESISTANCE TO
GROUND (Ω)
MAXIMUM SUPPLY
CURRENT ( µA)
01
Shutdown
1k
1
10
Shutdown
100k
1
11
Shutdown
1M
1
Table 3. Serial Interface Mapping
16-BIT SERIAL WORD
MSB
XX00
ANALOG
LSB
0000
0000
OUTPUT
FUNCTION
XXXX
0V
Normal operation
Normal operation
XX00
1111
1111
XXXX
VREF × (255/256)
XX00
0000
0001
XXXX
VREF × (1/256)
Normal operation
XX00
1000
0000
XXXX
VREF × (128/256)
Normal operation
XX01
XXXX
XXXX
XXXX
0V
Shutdown,
1kΩ to GND
XX10
XXXX
XXXX
XXXX
0V
Shutdown,
100kΩ to GND
XX11
XXXX
XXXX
XXXX
0V
Shutdown,
1MΩ to GND
X = Don’t care
_______________________________________________________________________________________
9
MAX5383/MAX5384/MAX5385
input register, it transfers its contents to the DAC latch
on CS’s low-to-high transition (Figure 3). Note that if CS
is not kept low during the entire 16 SCLK cycles, data
will be corrupted. In this case, reload the DAC latch
with a new 16-bit word. The serial clock (SCLK) can
idle either high or low between transitions. Figure 4
shows the complete 3-wire serial interface transmission. Table 3 lists serial interface mapping.
MAX5383/MAX5384/MAX5385
Low-Cost, Low-Power, 8-Bit DACs with 3-Wire
Serial Interface in SOT23
;;;;;;;;
;;;;;;;;;
; ; ;;
tCSH
CS
tCSO
tCSS
tCH
SCLK
tCS1
tCL
tDH
tDS
D15
DIN
D14
D0
Figure 3. 3-Wire Serial Interface Timing Diagram
CS
DAC
UPDATED
SCLK
DIN
D15 D14 D13 D12 D11 D10 D9 D8
D7 D6 D5 D4 D3 D2 D1 D0
Figure 4. Complete 3-Wire Serial Interface Transmission
Chip Information
+3.2V TO +12V
TRANSISTOR COUNT: 2160
IN
MAX6103 OUT
+3.00V
0.1µF
GND
VDD
CS
DIN
SCLK
MAX5385
OUT
0 TO +2.7V
GND
Figure 5. Powering the MAX5385 with a Precision Voltage
Reference
10
______________________________________________________________________________________
Low-Cost, Low-Power, 8-Bit DACs with 3-Wire
Serial Interface in SOT23
______________________________________________________________________________________
11
MAX5383/MAX5384/MAX5385
Package Information
Low-Cost, Low-Power, 8-Bit DACs with 3-Wire
Serial Interface in SOT23
MAX5383/MAX5384/MAX5385
Package Information (continued)
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.
12 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2002 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.