19-1559; Rev 0; 10/99
Low-Power, 12-Bit Voltage-Output DAC
with Serial Interface
__________________General Description
The MAX5302 combines a low-power, voltage-output,
12-bit digital-to-analog converter (DAC) and a precision
output amplifier in an 8-pin µMAX package. It operates
from a single +5V supply, drawing less than 280µA of
supply current.
The output amplifier’s inverting input is available to the
user, allowing specific gain configurations, remote sens-
ing, and high output current capability. This makes the
MAX5302 ideal for a wide range of applications, includ-
ing industrial process control. Other features include a
software shutdown and power-on reset.
The serial interface is SPI™/QSPI™/MICROWIRE™ com-
patible. The DAC has a double-buffered input, organized
as an input register followed by a DAC register. A 16-bit
serial word loads data into the input register. The DAC
register can be updated independently or simultaneously
with the input register. All logic inputs are TTL/CMOS-
logic compatible and buffered with Schmitt triggers to
allow direct interfacing to optocouplers.
o
+5V Single-Supply Operation
o
Low Supply Current: 0.28mA Normal Operation
2µA Shutdown Mode
o
Available in 8-Pin µMAX
o
Power-On Reset Clears DAC Output to Zero
o
SPI/QSPI/MICROWIRE Compatible
o
Schmitt-Trigger Digital Inputs for Direct
Optocoupler Interface
Features
o
12-Bit DAC with Configurable Output Amplifier
MAX5302
Ordering Information
PART
MAX5302CUA
MAX5302EUA
TEMP. RANGE
0°C to +70°C
-40°C to +85°C
PIN-PACKAGE
8 µMAX
8 µMAX
Applications
Industrial Process Control
Automatic Test Equipment
Digital Offset and Gain Adjustment
Motion Control
Remote Industrial Control
Microprocessor-Controlled Systems
Functional Diagram
GND
V
DD
REF
FB
OUT
DAC
OUT
1
CS
2
INPUT
REGISTER
CS
DIN
SCLK
DIN
3
SCLK
4
16-BIT
SHIFT
REGISTER
Pin Configuration
TOP VIEW
DAC
REGISTER
CONTROL
8
V
DD
GND
REF
FB
MAX5302
7
6
5
MAX5302
µMAX
SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
________________________________________________________________
Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
Low-Power, 12-Bit Voltage-Output DAC
with Serial Interface
MAX5302
ABSOLUTE MAXIMUM RATINGS
V
DD
to GND ..............................................................-0.3V to +6V
REF, OUT, FB to GND ................................-0.3V to (V
DD
+ 0.3V)
Digital Inputs to GND ...............................................-0.3V to +6V
Continuous Current into Any Pin.......................................±20mA
Continuous Power Dissipation (T
A
= +70°C)
8-Pin µMAX (derate 4.10mW/°C above +70°C) .........330mW
Operating Temperature Ranges
MAX5302CUA ...................................................0°C to +70°C
MAX5302EUA ................................................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10sec) .............................+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
(Circuit of Figure 8, V
DD
= +5V ±10%, V
REF
= +2.5V, R
L
= 5kΩ, C
L
= 100pF, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical val-
ues are at T
A
= +25°C. Output buffer connected in unity-gain configuration.)
PARAMETER
Resolution
Differential Nonlinearity
Integral Nonlinearity (Note 1)
Offset Error
Offset-Error Tempco
Gain Error (Note 1)
Gain-Error Tempco
Power-Supply Rejection Ratio
REFERENCE INPUT
Reference Input Range
Reference Input Resistance
Reference -3dB Bandwidth
Reference Feedthrough
Signal-to-Noise Plus
Distortion Ratio
DIGITAL INPUTS
Input Voltage High
Input Voltage Low
Input Leakage Current
Input Capacitance
V
IH
V
IL
I
IN
C
IN
V
IN
= 0 or V
DD
0.001
8
2.4
0.8
±0.5
V
V
µA
pF
SINAD
V
REF
R
REF
Code dependent, minimum at code 1554 hex
V
REF
= 0.67Vp-p
Input code = all 0s, V
REF
= 3.6Vp-p at 1kHz
V
REF
= 1Vp-p at 25kHz, code = full scale
0
14
20
650
-84
77
V
DD
- 1.4
V
kΩ
kHz
dB
dB
PSRR
4.5V
≤
V
DD
≤
5.5V
SYMBOL
N
DNL
INL
V
OS
TCV
OS
GE
±0.3
6
-0.3
1
800
±3
Guaranteed monotonic
CONDITIONS
MIN
12
±1.0
±4
±8
TYP
MAX
UNITS
Bits
LSB
LSB
mV
ppm/°C
LSB
ppm/°C
µV/V
STATIC PERFORMANCE—ANALOG SECTION
MULTIPLYING-MODE PERFORMANCE
2
_______________________________________________________________________________________
Low-Power, 12-Bit Voltage-Output DAC
with Serial Interface
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 8, V
DD
= +5V ±10%, V
REF
= +2.5V, R
L
= 5kΩ, C
L
= 100pF, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical val-
ues are at T
A
= +25°C. Output buffer connected in unity-gain configuration.)
PARAMETER
DYNAMIC PERFORMANCE
DIGITAL INPUTS
Voltage Output Slew Rate
Output Settling Time
Output Voltage Swing
Current into FB
Start-Up Time
Digital Feedthrough
POWER SUPPLIES
Supply Voltage
Supply Current
Supply Current in Shutdown
Reference Current in Shutdown
TIMING CHARACTERISTICS
(Figure 6)
SCLK Clock Period
SCLK Pulse Width High
SCLK Pulse Width Low
CS
Fall to SCLK Rise Setup Time
SCLK Rise to
CS
Rise Hold Time
DIN Setup Time
DIN Hold Time
SCLK Rise to
CS
Fall Delay
CS
Rise to SCLK Rise Hold Time
CS
Pulse Width High
t
CP
t
CH
t
CL
t
CSS
t
CSH
t
DS
t
DH
t
CS0
t
CS1
t
CSW
100
40
40
40
0
40
0
40
40
100
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
V
DD
I
DD
(Note 3)
(Note 3)
4.5
0.28
4
0.001
5.5
0.4
20
±0.5
V
mA
µA
µA
CS
= V
DD
, DIN = 100kHz
SR
To ±1/2LSB, V
STEP
= 2.5V
Rail-to-rail (Note 2)
0.6
14
0 to V
DD
0.001
20
5
±0.1
V/µs
µs
V
µA
µs
nVs
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX5302
Note 1:
Guaranteed from code 11 to code 4095 in unity-gain configuration.
Note 2:
Accuracy is better than 1LSB for V
OUT
= 8mV to (V
DD
- 100mV), guaranteed by a power-supply rejection test at the end
points.
Note 3:
R
L
=
∞,
digital inputs at GND or V
DD
.
_______________________________________________________________________________________
3
Low-Power, 12-Bit Voltage-Output DAC
with Serial Interface
MAX5302
__________________________________________Typical Operating Characteristics
(V
DD
= +5V, R
L
= 5kΩ, C
L
= 100pF, T
A
= +25°C, unless otherwise noted.)
INTEGRAL NONLINEARITY
vs. REFERENCE VOLTAGE
MAX5302 toc01
REFERENCE VOLTAGE INPUT
FREQUENCY RESPONSE
MAX5302 toc02
SUPPLY CURRENT
vs. TEMPERATURE
380
360
SUPPLY CURRENT (µA)
340
320
300
280
260
240
220
R
L
=
∞
MAX5302 toc03
0.3
0.2
0.1
0
INL (LSB)
-0.1
-0.2
-0.3
-0.4
-0.5
0.4
1.2
2.0
2.8
3.6
REFERENCE VOLTAGE (V)
0
400
-4
RELATIVE OUTPUT (dB)
-8
-12
-16
-20
4.4
0
500k
1M
1.5M
2M
2.5M
3M
FREQUENCY (Hz)
200
-60
-20
20
60
100
140
TEMPERATURE (°C)
POWER-DOWN SUPPLY CURRENT
vs. TEMPERATURE
MAX5302 toc04
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX5302 toc05
POWER-DOWN SUPPLY CURRENT (µA)
9
8
450
400
SUPPLY CURRENT (µA)
350
300
250
200
150
100
50
0
-55
-60
THD + NOISE (dB)
-65
-70
-75
-80
-85
-90
V
REF
= 2.5V
DC
+ 1Vp-p SINE
CODE = FULL SCALE
7
6
5
4
3
2
1
0
-60
-20
20
60
100
140
4.0
4.4
4.8
5.2
5.6
6.0
1
10
FREQUENCY (kHz)
100
TEMPERATURE (°C)
SUPPLY VOLTAGE (V)
OUTPUT FFT PLOT
MAX5302 toc07
FULL-SCALE OUTPUT vs. LOAD
MAX5302 toc08
REFERENCE FEEDTHROUGH
AT 1kHz
REFERENCE INPUT SIGNAL
-20
SIGNAL AMPLITUDE (dB)
MAX5302-09a/09b
0
FULL-SCALE OUTPUT (V)
-20
SIGNAL AMPLITUDE (dB)
V
REF
= 3.6Vp-p
CODE = FULL SCALE
f
IN
= 1kHz
2.49980
2.49976
2.49972
2.49968
2.49964
2.49960
2.49956
0.1k
0
-40
-40
-60
-60
OUTPUT FEEDTHROUGH
-80
-80
-100
0.5
1.6
2.7
3.8
4.9
6.0
FREQUENCY (kHz)
-100
1k
10k
LOAD (Ω)
100k
1M
0.5
1.6
2.7
3.8
4.9
6.0
FREQUENCY (kHz)
4
_______________________________________________________________________________________
MAX5302 toc06
10
500
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
-50
Low-Power, 12-Bit Voltage-Output DAC
with Serial Interface
MAX5302
Typical Operating Characteristics (continued)
(V
DD
= +5V, R
L
= 5kΩ, C
L
= 100pF, T
A
= +25°C, unless otherwise noted.)
MAJOR-CARRY TRANSITION
MAX5302 toc10
DIGITAL FEEDTHROUGH (f
SCLK
= 100kHz)
MAX5302 toc11
CS
5V/div
SCLK
2V/div
OUT
AC-COUPLED
100mV/div
OUT
AC-COUPLED
10mV/div
CODE = 2048
10µs/div
CS = 5V
2µs/div
DYNAMIC RESPONSE
MAX5302 toc12
OUT
1V/div
GND
10µs/div
GAIN = 2, SWITCHING FROM CODE 0 TO 4020
_______________________________________________________________________________________
5
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