19-0252; Rev 2; 5/96
Low-Cost, Triple, 8-Bit Voltage-Output DACs
with Serial Interface
_______________General Description
The MAX512/MAX513 contain three 8-bit, voltage-output
digital-to-analog converters (DAC A, DAC B, and DAC C).
Output buffer amplifiers for DACs A and B provide voltage
outputs while reducing external component count. The
output buffer for DAC A can source or sink 5mA to within
0.5V of V
DD
or V
SS
. The buffer for DAC B can source or
sink 0.5mA to within 0.5V of V
DD
or V
SS
. DAC C is
unbuffered, providing a third voltage output with increased
accuracy. The MAX512 operates with a single
+5V ±10% supply, and the MAX513 operates with a
+2.7V to +3.6V supply. Both devices can also operate
with split supplies.
The 3-wire serial interface has a maximum operating fre-
quency of 5MHz and is compatible with SPI™, QSPI™,
and Microwire™. The serial input shift register is 16 bits
long and consists of 8 bits of DAC input data and 8 bits
for DAC selection and shutdown. DAC registers can be
loaded independently or in parallel at the positive edge
––
—
of CS. A latched logic output is also available for auxil-
iary control.
Ultra-low power consumption and small packages
(14-pin DIP/SO) make the MAX512/MAX513 ideal for
portable and battery-powered applications. Supply cur-
rent is only 1mA, dropping to less than 1µA in shutdown.
Any of the three DACs can be independently shut down.
In shutdown mode, the DAC's R-2R ladder network is
disconnected from the reference input, minimizing sys-
tem power consumption.
____________________________Features
o
Operate from a Single +5V (MAX512) or
+3V (MAX513) Supply, or from Bipolar Supplies
o
Low Power Consumption
1mA Operating Current
<1µA Shutdown Current
o
Unipolar or Bipolar Outputs
o
5MHz, 3-Wire Serial Interface
o
SPI, QSPI, and Microwire Compatible
o
Two Buffered, Bipolar-Output DACs (DACs A/B)
o
Independently Programmable Shutdown Mode
o
Space-Saving 14-Pin SO/DIP Packages
o
Pin and Software Reset
MAX512/MAX513
______________Ordering Information
PART
MAX512CPD
MAX512CSD
MAX512C/D
TEMP. RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
PIN-PACKAGE
14 Plastic DIP
14 SO
Dice*
Ordering Information continued at end of data sheet.
* Contact factory for dice specifications.
________________Functional Diagram
DIN
1
SCLK
3
DAC
LATCH
A
DAC A
CS
2
REFAB REFC
12
11
________________________Applications
Digital Gain and Offset Adjustment
Programmable Attenuators
Programmable Current Sources
Programmable Voltage Sources
RF Digitally Adjustable Bias Circuits
VCO Tuning
OUTA
8
16-BIT SHIFT REGISTER
DATA (8)
__________________Pin Configuration
TOP VIEW
DIN
CS
1
2
14
LOUT
13
I.C.
DAC
LATCH
B
DAC B
OUTB
9
DAC
LATCH
C
DAC C
OUTC
10
CONTROL (8)
SCLK
3
RESET
4
V
DD
GND
5
6
MAX512
MAX513
12
REFAB
11
REFC
10
OUTC
9
8
OUTB
OUTA
MAX512
MAX513
LATCH
LOUT
14
5
V
DD
7
V
SS
6
GND
V
SS
7
DIP/SO
4
RESET
Microwire is a trademark of National Semiconductor Corp. SPI and QSPI are trademarks of Motorola Inc.
________________________________________________________________
Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
Low-Cost, Triple, 8-Bit Voltage-Output DACs
with Serial Interface
MAX512/MAX513
ABSOLUTE MAXIMUM RATINGS
V
DD
to GND ................................................................ -0.3V, +6V
V
SS
to GND................................................................. -6V, +0.3V
V
DD
to V
SS
................................................................ -0.3V, +12V
Digital Inputs and Outputs to GND............... -0.3V, (V
DD
+ 0.3V)
REFAB ................................................ (V
SS
- 0.3V), (V
DD
+ 0.3V)
OUTA, OUTB (Note 1) ....................................................V
SS
, V
DD
OUTC.............................................................-0.3V, (V
DD
+ 0.3V)
REFC..............................................................-0.3V, (V
DD
+ 0.3V)
Continuous Power Dissipation (T
A
= +70°C)
Plastic DIP (derate 10.00mW/°C above +70°C) ............800mW
SO (derate 8.33mW/°C above +70°C) ...........................667mW
CERDIP (derate 9.09mW/°C above +70°C) ...................727mW
Operating Temperature Ranges
MAX51_C_ _ .........................................................0°C to +70°C
MAX51_E_ _.......................................................-40°C to +85°C
MAX51_MJD ....................................................-55°C to +125°C
Storage Temperature Range .............................-65°C to +165°C
Lead Temperature (soldering, 10sec) .............................+300°C
Note 1:
The outputs may be shorted to V
DD
, V
SS
, or GND if the package power dissipation is not exceeded. Typical short-circuit cur-
rent to GND is 50mA.
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
= +4.5V to +5.5V for MAX512, V
DD
= +2.7V to +3.6V for MAX513, V
SS
= GND = 0V, REFAB = REFC = V
DD
,
T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
STATIC PERFORMANCE
Resolution
Differential Nonlinearity
Integral Nonlinearity
Total Unadjusted Error
Zero-Code Temperature
Coefficient
N
DNL
INL
TUE
Guaranteed monotonic
DAC A/B (Note 2)
DAC C
(Note 2)
DAC A/B
DAC C
MAX512, 4.5V
≤
V
DD
≤
5.5V,
REFAB = REFC = 4.096V
MAX513, 2.7V
≤
V
DD
≤
3.6V,
REFAB = REFC = 2.4V
REFAB
REFC
REFAB (Note 3)
REFC (Note 3)
REFAB, REFC
V
SS
GND
25
R
REF
8
12
2
±1
100
5
0.01
%/%
0.015
8
±1
±1.5
±1
Bits
LSB
LSB
LSB
LSB
µV/°C
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Power-Supply Rejection Ratio
PSRR
REFERENCE INPUTS
Reference Input Voltage Range
Reference Input Capacitance
Reference Input Resistance
Reference Input Resistance
(shutdown mode)
V
DD
V
DD
V
pF
kΩ
MΩ
2
_______________________________________________________________________________________
Low-Cost, Triple, 8-Bit Voltage-Output DACs
with Serial Interface
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +4.5V to +5.5V for MAX512, V
DD
= +2.7V to +3.6V for MAX513, V
SS
= GND = 0V, REFAB = REFC = V
DD
,
T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
DAC OUTPUTS
Output Voltage Range
DAC A
Capacitive Load
DAC B
DAC C
DAC A
Output Resistance
DIGITAL INPUTS
Input High Voltage
Input Low Voltage
Input Current
Input Capacitance
DIGITAL OUTPUT
Output High Voltage
Output Low Voltage
DYNAMIC PERFORMANCE
Voltage-Output Slew Rate
Voltage-Output Settling Time
Digital Feedthrough and Crosstalk
POWER SUPPLIES
Positive Supply Voltage Range
Negative Supply Voltage Range
(Note 6)
Positive Supply Current
Negative Supply Current
Shutdown Supply Current
V
DD
V
SS
I
DD
I
SS
MAX512
MAX513
MAX512
MAX513
All inputs = 0V
MAX512 (V
DD
= 5.5V)
MAX513 (V
DD
= 3.6V)
4.5
2.7
-5.5
-3.6
1.3
0.9
-1.3
0.1
5.5
3.6
-4.5
-2.7
2.8
2.5
V
V
mA
mA
µA
SR
C
L
= 0.1µF (DAC A), C
L
= 0.01µF (DAC B)
C
L
= 0.1µF (DAC A)
To ±
1
⁄
2
LSB
All 0s to all 1s
C
L
= 0.01µF (DAC B)
C
L
= 0.1nF (DAC C)
0.1
70
70
35
10
nV-s
µs
V/µs
V
OH
V
OL
I
SOURCE
≤
1.6mA
I
SINK
≤
1.6mA
V
DD
- 0.4
0.4
V
V
V
IH
V
IL
I
IN
C
IN
V
IN
= 0V or V
DD
(Notes 4, 5)
0.1
(0.7)(V
DD
)
(0.3)(V
DD
)
±10
10
V
V
µA
pF
DAC B
DAC C
0
0.10
0.01
0
0.050
0.500
24
kΩ
µF
REF_
V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX512/MAX513
All inputs = 0V, V
SS
= -5.5V
Note 2:
Digital code from 24 through 232 are due to swing limitations of output amplifiers on DAC A and DAC B. See
Typical
Operating Characteristics.
Note 3:
Reference input resistance is code dependent. The lowest input resistance occurs at code 55hex. Refer to the reference
input section in the
Detailed Description.
Note 4:
Guaranteed by design. Not production tested.
Note 5:
Input capacitance is code dependent. The highest capacitance occurs at code 00hex.
Note 6:
For single-supply mode, tie V
SS
to GND.
_______________________________________________________________________________________
3
Low-Cost, Triple, 8-Bit Voltage Output DACs
with Serial Interface
MAX512/MAX513
TIMING CHARACTERISTICS
(Note 4)
(V
DD
= +4.5V to +5.5V for MAX512, V
DD
= +2.7V to +3.6V for MAX513, V
SS
= GND = 0V, T
A
= T
MIN
to T
MAX
, unless otherwise noted.)
PARAMETER
SERIAL INTERFACE TIMING
––
—
CS Fall to SCLK Rise Setup Time
––
—
SCLK Rise to CS Rise Setup Time
DIN to SCLK Rise Setup Time
DIN to SCLK Rise Hold Time
SCLK Pulse Width High
SCLK Pulse Width Low
Output Delay LOUT
––
—
CS Pulse Width High
SYMBOL
t
CSS
t
CSH
t
DS
t
DH
t
CH
t
CL
t
OD
t
CSPWH
C
L
= 100pF
200
CONDITIONS
MIN
150
150
50
50
100
100
150
TYP
MAX
UNITS
ns
ns
ns
ns
ns
ns
ns
ns
Note 4:
Guaranteed by design. Not production tested.
__________________________________________Typical Operating Characteristics
(T
A
= +25°C, unless otherwise noted.)
OUTPUT VOLTAGE vs.
OUTPUT SOURCE CURRENT (V
DD
= 3V)
MAX512 TOC-01
OUTPUT VOLTAGE vs.
OUTPUT SOURCE CURRENT (V
DD
= 5V)
MAX512 TOC-02
OUTPUT VOLTAGE vs.
OUTPUT SINK CURRENT
V
DD
= 3V, V
SS
= GND = 0V
800 REFAB = V
DD
CODE = ALL 1s
700
600
500
400
300
200
100
DAC B
MAX512 TOC-03
3.5
3
OUTPUT VOLTAGE (V)
2.5
2
1.5
1
0.5
V
DD
= 3V, V
SS
= GND = 0V
REFAB = V
DD
CODE = ALL 1s
DAC B
DAC A
5.2
5.0
OUTPUT VOLTAGE (V)
4.8
4.6
4.4
4.2
4.0
V
DD
= 5V, V
SS
= GND = 0V
REFAB = V
DD
CODE = ALL 1s
DAC B
DAC A
900
DAC A
0
0.0001 0.001 0.01
0.1
1
10
100
3.8
0.0001 0.001 0.01
OUTPUT VOLTAGE (mV)
1
10
100
0.1
0
0.0001 0.001 0.01
0.1
1
10
100
OUTPUT SOURCE CURRENT (mA)
OUTPUT SOURCE CURRENT (mA)
OUTPUT SINK CURRENT (mA)
TOTAL UNADJUSTED ERROR
vs. DIGITAL CODE (Dual Supplies)
MAX512 TOC-04
TOTAL UNADJUSTED ERROR
vs. DIGITAL CODE (Single Supply)
MAX512 TOC-05
POSITIVE SUPPLY CURRENT
vs. SUPPLY VOLTAGE
1.4
1.3
1.2
I
DD
(mA)
1.1
1.0
0.9
0.8
0.7
REFAB = REFC = V
DD
ALL LOGIC INPUTS GROUNDED
MAX512 TOC-06
12
10
8
TUE (LSB)
6
4
2
0
-2
0
DAC A LOADED WITH 5mA
-5
-10
TUE (LSB)
-15
-20
-25
-30
-35
0
32
64
96
128
V
DD
= 3V, V
SS
= GND = 0V
REFAB = 3V
DAC B LOADED WITH 0.5mA
1.5
V
DD
= +3V, V
SS
= -3V
REFAB = V
SS
, REFC = V
DD
CODE = ALL 1s
DAC A LOADED WITH 5mA
DAC B LOADED WITH 0.5mA
DAC A NO LOAD
DAC B NO LOAD
DAC C NO LOAD
0
32
64
96 128 160 192 224 255
DIGITAL CODE
0.6
0.5
2.5
3.0
3.5
4.0
V
DD
(V)
4.5
5.0
5.5
160 192 224 255
DIGITAL CODE
4
_______________________________________________________________________________________
Low-Cost, Triple, 8-Bit Voltage Output DACs
with Serial Interface
____________________________Typical Operating Characteristics (continued)
(T
A
= +25°C, unless otherwise noted.)
MAX512/MAX513
SUPPLY CURRENT
vs. REFERENCE VOLTAGE
MAX512 TOC-07
POSITIVE SUPPLY CURRENT
vs. TEMPERATURE
MAX512 TOC-08
SHUTDOWN SUPPLY CURRENT
vs. TEMPERATURE
SHUTDOWN SUPPLY CURRENT (µA)
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
-60 -40 -20 0
20 40 60 80 100 120 140
V
DD
= +5V, V
SS
= GND = 0V
REFAB = REFC = V
DD
ALL LOGIC INPUTS = +5V
MAX512 TOC-09
1.5
1.0
0.5
0
I
DD
, V
DD
= 5V, V
SS
= -5V
1.370
1.365
1.360
I
DD
(mA)
1.355
1.350
1.345
1.340
V
DD
= +5V, V
SS
= GND = 0V
REFAB = REFC = V
DD
ALL LOGIC INPUTS = +5V
ALL DACs SET TO ALL 1s
-60 -40 -20 0
4.5
I
SUPPLY
(mA)
I
DD
, V
DD
= 3V, V
SS
= -3V
REFC GROUNDED FOR REF_ < 0
CODE = ALL 1s
I
SS
, V
DD
= 3V, V
SS
= -3V
-0.5
-1.0
-1.5
-5 -4
I
SS
, V
DD
= 5V, V
SS
= -5V
-3
-2
-1
0
1
2
3
4
20 40 60 80 100 120 140
REFAB = REFC (V)
TEMPERATURE (°C)
TEMPERATURE (°C)
REFERENCE FEEDTHROUGH
vs. FREQUENCY
MAX512 TOC-10
REFERENCE LARGE-SIGNAL
FREQUENCY RESPONSE
MAX512 TOC-11
REFERENCE SMALL-SIGNAL
FREQUENCY RESPONSE
0
RELATIVE OUTPUT (dB)
DAC C
DAC B
-40
MAX512 TOC-12
0
-20
FEEDTHROUGH (dB)
-40
-60
-80
RELATIVE OUTPUT (dB)
V
DD
= 3V, V
SS
= GND = 0V
REF_ FROM 0V TO 2.9V
NO LOAD
CODE = ALL 0s
5
0
-5
-10
-15
-20
V
DD
= 3V, V
SS
= GND = 0V
REFAB, REFC
SINE WAVE 0V TO V
DD
0.01
0.1
1
10
100
DAC A
-20
DAC C
DAC A, B
-60
-100
-120
0.01
0.1
1
10
100
1000
FREQUENCY (kHz)
-25
0.001
-80
1000
V
DD
= 3V, V
SS
= GND = 0V
REFAB, REFC
SINE WAVE ±40mV
0.1k
1k
10k
100k
1M
10M
FREQUENCY (kHz)
FREQUENCY (Hz)
_______________________________________________________________________________________
5
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