19-1088; Rev 3; 12/99
+5V, Serial-Input, Voltage-Output, 14-Bit DACs
General Description
The MAX544/MAX545 are serial-input, voltage-output,
14-bit digital-to-analog converters (DACs) that operate
from a single +5V supply. They provide 14-bit perfor-
mance (±0.5LSB INL and ±0.9LSB DNL) over tempera-
ture without any adjustments. The DAC output is
unbuffered, resulting in a low supply current of 0.3mA
and a low offset error of 0.6mV.
The DAC output range is 0V to V
REF.
For bipolar opera-
tion, matched scaling resistors are provided in the
MAX545 for use with an external precision op amp
(such as the MAX400), generating a ±V
REF
output
swing. The MAX545 also includes Kelvin-sense con-
nections for the reference and analog ground pins to
reduce layout sensitivity.
A 16-bit serial word is used to load data into the DAC
latch. The 10MHz, 3-wire serial interface is compatible
with SPI™/QSPI™/MICROWIRE™, and it also interfaces
directly with optocouplers for applications requiring isola-
tion. A power-on reset circuit clears the DAC output to 0V
(unipolar mode) when power is initially applied.
The MAX544 is available in 8-pin plastic DIP and SO
packages. The MAX545 is available in 14-pin plastic
DIP and SO packages.
o
+5V Single-Supply Operation
o
Low Power: 1.5mW
o
1µs Settling Time
o
Unbuffered Voltage Output Directly Drives 60kΩ
Loads
o
SPI/QSPI/MICROWIRE-Compatible Serial Interface
o
Power-On Reset Circuit Clears DAC Output to 0V
(unipolar mode)
o
Schmitt-Trigger Inputs for Direct Optocoupler
Interface
o
Pin-Compatible 16-Bit Upgrades
(MAX541/MAX542)
Features
o
Full 14-Bit Performance Without Adjustments
MAX544/MAX545
Ordering Information
PART
MAX544ACPA
MAX544BCPA
MAX544ACSA
MAX544BCSA
TEMP. RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
PIN-PACKAGE
8 Plastic DIP
8 Plastic DIP
8 SO
8 SO
INL
(LSB)
±1/2
±1
±1/2
±1
Applications
Digital Offset and Gain Adjustment
Instrumentation
Industrial Process Control
Automated Test Equipment
Data-Acquisition Systems
Ordering Information continued at end of data sheet.
Functional Diagrams
V
DD
RFB
R
FB
INV
Pin Configurations
TOP VIEW
REFF
REFS
MAX545
R
INV
RFB 1
OUT 2
14 V
DD
13 INV
14-BIT DAC
OUT
AGNDF
OUT
1
AGND
2
REF
3
CS
4
8
V
DD
AGNDF 3
AGNDS 4
REFS 5
MAX545
12 DGND
11 LDAC
10 DIN
9 N.C.
8
SCLK
MAX544
7
DGND
6
DIN
5
SCLK
REFF 6
CS 7
CS
LDAC
SCLK
DIN
DATA LATCH
CONTROL
LOGIC
SERIAL INPUT REGISTER
DGND
AGNDS
DIP/SO
DIP/SO
Functional Diagrams continued at end of data sheet.
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.
+5V, Serial-Input, Voltage-Output, 14-Bit DACs
MAX544/MAX545
ABSOLUTE MAXIMUM RATINGS
V
DD
to DGND ...........................................................-0.3V to +6V
CS,
SCLK, DIN,
LDAC
to DGND ..............................-0.3V to +6V
REF, REFF, REFS to AGND ........................-0.3V to (V
DD
+ 0.3V)
AGND, AGNDF, AGNDS to DGND .......................-0.3V to +0.3V
OUT, INV to AGND DGND .......................................-0.3V to V
DD
RFB to AGND DGND...................................................-6V to +6V
Maximum Current into Any Pin............................................50mA
Continuous Power Dissipation (T
A
= +70°C)
8-Pin Plastic DIP (derate 9.09mW/°C above +70°C) .....727mW
8-Pin SO (derate 5.88mW/°C above +70°C) .................471mW
14-Pin Plastic DIP (derate 10.00mW/°C above +70°C) ...800mW
14-Pin SO (derate 8.33mW/°C above +70°C) ...............667mW
14-Pin Ceramic SB (derate 10.00mW/°C above +70°C...800mW
Operating Temperature Ranges
MAX544 _C_ A/MAX545_C_D ..............................0°C to +70°C
MAX544 _E_ A/MAX545_E_D............................-40°C to +85°C
MAX545BMJD .................................................-55°C to +125°C
Storage Temperature Range .............................-65°C to +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
(V
DD
= +5V ± 5%, V
REF
= +2.5V, AGND = DGND = 0, T
A
= T
MIN
to T
MAX
, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN
14
MAX54_A
MAX54_B
±0.15
±0.15
±0.15
±0.05
±5
±0.1
R
OUT
(Note 2)
MAX545
MAX545
BZS
TC
PSR
V
REF
R
REF
MAX545
4.75V
≤
V
DD
≤
5.25V
(Note 3)
Unipolar mode
MAX545, bipolar mode
2.0
11.5
9.0
25
1
10
10
±0.5
±1.0
3.0
R
FB
/R
INV
Ratio error
6.25
1.0
±0.03
±10
±0.5
±1
±0.9
±0.6
TYP
MAX
UNITS
Bits
LSB
LSB
mV
ppm/°C
LSB
ppm/°C
kΩ
STATIC PERFORMANCE—ANALOG SECTION
(R
L
=
∞)
Resolution
N
Integral Nonlinearity
Differential Nonlinearity
Zero-Code Offset Error
Zero-Code Tempco
Gain Error (Note 1)
Gain-Error Tempco
DAC Output Resistance
Bipolar Resistor Matching
Bipolar Zero Offset Error
Bipolar Zero Tempco
Power-Supply Rejection
REFERENCE INPUT
Reference Input Range
Reference Input Resistance
(Note 4)
INL
DNL
ZSE
ZS
TC
V
DD
= 5V
Guaranteed monotonic
%
LSB
ppm/°C
LSB
V
kΩ
DYNAMIC PERFORMANCE—ANALOG SECTION
(R
L
=
∞,
unipolar mode)
Voltage-Output Slew Rate
SR
C
L
= 10pF (Note 5)
Output Settling Time
DAC Glitch Impulse
Digital Feedthrough
To ±
1
/
2
LSB of FS, C
L
= 10pF
Major-carry transition
Code = 0000 hex;
CS
= V
DD
;
LDAC
= 0V;
SCLK, DIN = 0V to V
DD
levels
V/µs
µs
nVs
nVs
2
_______________________________________________________________________________________
+5V, Serial-Input, Voltage-Output, 14-Bit DACs
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +5V ± 5%, V
REF
= +2.5V, AGND = DGND = 0, T
A
= T
MIN
to T
MAX
, unless otherwise noted.)
PARAMETER
Reference -3dB Bandwidth
Reference Feedthrough
Signal-to-Noise Ratio
Reference Input Capacitance
SNR
C
IN
Code = 0000 hex
Code = FFFC hex
2.4
0.8
V
IN
= 0
(Note 6)
0.40
4.75
0.3
1.5
5.25
1.1
±1
10
SYMBOL
BW
CONDITIONS
Code = FFFC hex
Code = 0000 hex, V
REF
= 1Vp-p at 100kHz
MIN
TYP
1
1
83
75
120
MAX
UNITS
MHz
mVp-p
dB
pF
MAX544/MAX545
DYNAMIC PERFORMANCE—REFERENCE SECTION
STATIC PERFORMANCE—DIGITAL INPUTS
Input High Voltage
Input Low Voltage
Input Current
Input Capacitance
Hysteresis Voltage
POWER SUPPLY
Positive Supply Range
Positive Supply Current
Power Dissipation
V
DD
I
DD
PD
V
mA
mW
V
IH
V
IL
I
IN
C
IN
V
H
V
V
µA
pF
V
TIMING CHARACTERISTICS
(V
DD
= +5V ± 5%, V
REF
= +2.5V, AGND = DGND = 0, CMOS inputs, T
A
= T
MIN
to T
MAX
, unless otherwise noted.)
PARAMETER
SCLK Frequency
SCLK Pulse Width High
SCLK Pulse Width Low
CS
Low to SCLK High Setup
CS
High to SCLK High Setup
SCLK High to
CS
Low Hold
SCLK High to
CS
High Hold
DIN to SCLK High Setup
DIN to SCLK High Hold
LDAC
Pulse Width
CS
High to
LDAC
Low Setup
V
DD
High to
CS
Low
(power-up delay)
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
Note 6:
SYMBOL
f
SCLK
t
CH
t
CL
t
CSS0
t
CSS1
t
CSH0
t
CSH1
t
DS
t
DH
t
LDAC
t
LDACS
MAX545
MAX545 (Note 6)
(Note 6)
45
45
45
45
30
45
40
0
50
50
20
CONDITIONS
MIN
TYP
MAX
10
UNITS
MHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
µs
Gain Error tested at V
REF
= 2.0V, 2.5V, and 3.0V.
R
OUT
tolerance is typically ±20%.
Min/max range guaranteed by gain-error test. Operation outside min/max limits will result in degraded performance.
Reference input resistance is code dependent, minimum at 8554 hex.
Slew-rate value is measured from 0% to 63%.
Guaranteed by design. Not production tested.
_______________________________________________________________________________________
3
+5V, Serial-Input, Voltage-Output, 14-Bit DACs
MAX544/MAX545
Typical Operating Characteristics
(V
DD
= 5V, V
REF
= +2.5V, T
A
= +25°C, unless otherwise noted.)
SUPPLY CURRENT
vs. TEMPERATURE
MAX544/MAX545-01
SUPPLY CURRENT
vs. REFERENCE VOLTAGE
MAX544/MAX545-02
ZERO-CODE OFFSET ERROR
vs. TEMPERATURE
0.15
ZERO-CODE OFFSET ERROR (LSB)
0.10
0.05
0
-0.05
-0.10
-0.15
-0.20
MAX544/MAX545-03
0.50
0.45
SUPPLY CURRENT (mA)
0.40
0.35
0.30
0.25
0.20
-40
-20
0
20
40
60
80
0.35
0.34
0.33
SUPPLY CURRENT (mA)
0.32
0.31
0.30
0.29
0.28
0.27
0.26
0.25
0.20
100
0
1
2
3
4
5
6
-60
-20
20
60
100
140
TEMPERATURE (°C)
REFERENCE VOLTAGE (V)
TEMPERATURE (°C)
INTEGRAL NONLINEARITY
vs. TEMPERATURE
MAX544/MAX545-04
DIFFERENTIAL NONLINEARITY
vs. TEMPERATURE
MAX544/MAX545-05
GAIN ERROR
vs. TEMPERATURE
0.15
0.10
MAX544/MAX545-06
0.30
0.20
0.10
INL (LSB)
0
-0.10
-0.20
-0.30
-60
-20
20
60
100
-INL
0.30
0.20
0.10
DNL (LSB)
0
-DNL
-0.10
-0.20
-0.30
0.20
+INL
+DNL
GAIN ERROR (LSB)
0.05
0
-0.05
-0.10
-0.15
-0.20
140
-60
-20
20
60
100
140
-60
-20
20
60
100
140
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
INTEGRAL NONLINEARITY
vs. CODE
MAX544/MAX545-07
DIFFERENTIAL NONLINEARITY
vs. CODE
MAX544/MAX545-08
REFERENCE CURRENT
vs. CODE
MAX544/MAX545-09
0.250
0.250
200
REFERENCE CURRENT (µA)
0
0.125
DNL (LSB)
INL (LSB)
0.125
160
120
0
0
80
-0.125
-0.125
40
-0.250
0
5k
10k
DAC CODE
15k
20k
-0.250
5k
10k
DAC CODE
15k
20k
0
0
4k
8k
12k
16k
20k
DAC CODE
4
_______________________________________________________________________________________
+5V, Serial-Input, Voltage-Output, 14-Bit DACs
Typical Operating Characteristics (continued)
(V
DD
= +5V, V
REF
= +2.5V, T
A
= +25°C, unless otherwise noted.)
FULL-SCALE STEP RESPONSE
(f
SCLK
= 10MHz)
MAX544-10
MAX544/MAX545
FULL-SCALE STEP RESPONSE
(f
SCLK
= 20MHz)
C
L
= 10pF
R
L
=
∞
MAX544-10A
C
L
= 10pF
R
L
=
∞
OUT
500mV/div
OUT
500mV/div
2µs/div
1µs/div
2µs/div
400ns/div
MAJOR-CARRY OUTPUT GLITCH
DIGITAL FEEDTHROUGH
CS
(5V/div)
SCLK
5V/div
OUT
(AC-COUPLED,
100mV/div)
2µs/div
MAX544/MAX545-11
OUT
(AC-COUPLED,
50mV/div)
2µs/div
MAX544/MAX545-12
CODE = 0000 hex
Pin Descriptions
MAX544
PIN
1
2
3
4
5
6
7
8
NAME
OUT
AGND
REF
CS
SCLK
DIN
DGND
V
DD
DAC Output Voltage
Analog Ground
Voltage Reference Input. Connect to external +2.5V reference.
Chip-Select Input
Serial-Clock Input. Duty cycle must be between 40% and 60%.
Serial-Data Input
Digital Ground
+5V Supply Voltage
5
FUNCTION
_______________________________________________________________________________________
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