19-0252; Rev 2; 5/96
Low-Cost, Triple, 8-Bit Voltage-Output DACs
with Serial Interface
____________________________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
______________Ordering Information
PART
14 Plastic DIP
MAX512CSD
MAX512C/D
0°C to +70°C
0°C to +70°C
14 SO
Dice*
Ordering Information continued at end of data sheet.
* Contact factory for dice specifications.
________________Functional Diagram
DIN
1
14 LOUT
CS
2
13 I.C.
SCLK 3
MAX512
MAX513
12 REFAB
RESET 4
11 REFC
V DD
5
10 OUTC
GND
6
9
8
REFAB REFC
12
11
SCLK
3
DAC
LATCH
A
DAC B
DAC
LATCH
C
OUTA
8
DAC A
DAC
LATCH
B
DAC C
OUTB
9
OUTC
10
MAX512
MAX513
OUTB
V SS 7
CS
2
16-BIT SHIFT REGISTER
DATA (8)
TOP VIEW
DIN
1
CONTROL (8)
__________________Pin Configuration
PIN-PACKAGE
0°C to +70°C
________________________Applications
Digital Gain and Offset Adjustment
Programmable Attenuators
Programmable Current Sources
Programmable Voltage Sources
RF Digitally Adjustable Bias Circuits
VCO Tuning
TEMP. RANGE
MAX512CPD
OUTA
DIP/SO
LOUT
14
LATCH
4
RESET
5
VDD
7
VSS
6
GND
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
MAX512/MAX513
_______________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 VDD or VSS. 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 frequency 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 auxiliary control.
Ultra-low power consumption and small packages
(14-pin DIP/SO) make the MAX512/MAX513 ideal for
portable and battery-powered applications. Supply current 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 system power consumption.
