Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsData collecting ICsData acquisition IC - DA converter (DAC) SOIC 14

_______________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

or V

. The buffer for DAC B can source or

sink 0.5mA to within 0.5V of V

or V

. 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

–

—

–

. 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.

________________________Applications

Digital Gain and Offset Adjustment

Programmable Attenuators

Programmable Current Sources

Programmable Voltage Sources

RF Digitally Adjustable Bias Circuits

VCO Tuning

____________________________Features

♦ Operate from a Single +5V (MAX512) or

+3V (MAX513) Supply, or from Bipolar Supplies

♦ Low Power Consumption

1mA Operating Current

<1µA Shutdown Current

♦ Unipolar or Bipolar Outputs

♦ 5MHz, 3-Wire Serial Interface

♦ SPI, QSPI, and Microwire Compatible

♦ Two Buffered, Bipolar-Output DACs (DACs A/B)

♦ Independently Programmable Shutdown Mode

♦ Space-Saving 14-Pin SO/DIP Packages

♦ Pin and Software Reset

______________Ordering Information

Ordering Information continued at end of data sheet.

* Contact factory for dice specifications.

MAX512/MAX513

Low-Cost, Triple, 8-Bit Voltage-Output DACs

with Serial Interface

________________________________________________________________

Maxim Integrated Products

DAC

LATCH

DAC A

DAC

LATCH

DAC B

DAC

LATCH

LATCH

DAC C

SCLK

OUTA

OUTB

OUTC

LOUT

DIN CS REFAB REFC

RESET

GND

16-BIT SHIFT REGISTER

CONTROL (8) DATA (8)

MAX512

MAX513

567

1112

________________Functional Diagram

LOUT

I.C.

REFAB

REFC

RESET

SCLK

DIN

DIP/SO

TOP VIEW

MAX512

MAX513

OUTC

OUTB

OUTA

GND

__________________Pin Configuration

19-0252; Rev 2; 5/96

PART TEMP. RANGE PIN-PACKAGE

MAX512CPD

0°C to +70°C 14 Plastic DIP

MAX512CSD 0°C to +70°C 14 SO

MAX512C/D 0°C to +70°C Dice*

Microwire is a trademark of National Semiconductor Corp. SPI and QSPI are trademarks of Motorola Inc.

For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800

Summary of content (16 pages)

PAGE 1
9-0252; Rev 2; 5/96 Low-Cost, Triple, 8-Bit Voltage-Output DACs with Serial Interface ____________________________Features ♦ Operate from a Single +5V (MAX512) or +3V (MAX513) Supply, or from Bipolar Supplies ♦ Low Power Consumption 1mA Operating Current <1µA Shutdown Current ♦ Unipolar or Bipolar Outputs ♦ 5MHz, 3-Wire Serial Interface ♦ SPI, QSPI, and Microwire Compatible ♦ Two Buffered, Bipolar-Output DACs (DACs A/B) ♦ Independently Programmable Shutdown Mode ♦ Space-Saving 14-Pin SO/DIP Packages ♦ Pin
PAGE 2
MAX512/MAX513 Low-Cost, Triple, 8-Bit Voltage-Output DACs with Serial Interface ABSOLUTE MAXIMUM RATINGS VDD to GND ................................................................ -0.3V, +6V VSS to GND................................................................. -6V, +0.3V VDD to VSS ................................................................ -0.3V, +12V Digital Inputs and Outputs to GND............... -0.3V, (VDD + 0.3V) REFAB ................................................ (VSS - 0.
PAGE 3
Low-Cost, Triple, 8-Bit Voltage-Output DACs with Serial Interface (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 , TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS REF_ V DAC OUTPUTS Output Voltage Range 0 Capacitive Load Output Resistance DAC A 0.10 DAC B 0.01 DAC C 0 µF DAC A 0.050 DAC B 0.
PAGE 4
TIMING CHARACTERISTICS (Note 4) (VDD = +4.5V to +5.5V for MAX512, VDD = +2.7V to +3.6V for MAX513, VSS = GND = 0V, TA = TMIN to TMAX, unless otherwise noted.
PAGE 5
Low-Cost, Triple, 8-Bit Voltage Output DACs with Serial Interface REFC GROUNDED FOR REF_ < 0 CODE = ALL 1s ISS, VDD = 3V, VSS = -3V -0.5 -1.0 1.340 -3 -2 -1 1 0 3 2 3.0 2.5 2.0 1.5 1.0 0.5 20 40 60 80 100 120 140 -60 -40 -20 0 20 40 60 80 100 120 140 REFAB = REFC (V) TEMPERATURE (°C) TEMPERATURE (°C) REFERENCE FEEDTHROUGH vs. FREQUENCY REFERENCE LARGE-SIGNAL FREQUENCY RESPONSE REFERENCE SMALL-SIGNAL FREQUENCY RESPONSE -40 DAC C -60 -80 DAC A, B 0 -5 -10 -15 -20 -100 -120 0.
PAGE 6
MAX512/MAX513 Low-Cost, Triple, 8-Bit Voltage Output DACs with Serial Interface ____________________________Typical Operating Characteristics (continued) (TA = +25°C, unless otherwise noted.) LINE-TRANSIENT RESPONSE (OUTC) LINE-TRANSIENT RESPONSE (OUTA) 3.14V 3.14V A A 2.86V 2.86V B B 20µs/div 20µs/div REFC = 2.56V, NO LOAD, CODE = ALL 1s REFAB = 2.
PAGE 7
Low-Cost, Triple, 8-Bit Voltage Output DACs with Serial Interface POSITIVE SETTLING TIME (DAC A) POSITIVE SETTLING TIME (DAC B) A A B B 20µs/div 20µs/div VDD = 3V, VSS = 0V, REFAB = VDD, RL = 1k Ω, CL = 0.1µF ALL BITS OFF TO ALL BITS ON VDD = 3V, VSS = 0V, REFAB = VDD, RL = 10k Ω, CL = 0.
PAGE 8
MAX512/MAX513 Low-Cost, Triple, 8-Bit Voltage-Output DACs with Serial Interface _____________________________Typical Operating Characteristics (continued) (TA = +25°C, unless otherwise noted.) TIME EXITING SHUTDOWN MODE OUTPUT VOLTAGE NOISE DC TO 1MHz A OUTA, 200µV/div B 20µs/div 2ms/div VDD = 3V, VSS = 0V, REFAB = VDD, RL = 1k Ω, CL = 0.
PAGE 9
Low-Cost, Triple, 8-Bit Voltage-Output DACs with Serial Interface MAX512/MAX513 _______________Detailed Description Analog Section The MAX512/MAX513 contain three 8-bit, voltage-output, digital-to-analog converters (DACs). The DACs are “inverted” R-2R ladder networks using complementary switches that convert 8-bit digital inputs into equivalent analog output voltages in proportion to the applied reference voltages.
PAGE 10
Reset –————– –— ———– The RESET input is active low. When asserted (RESET = 0), DACs A and B are set to full scale (FFhex) and active, while DAC C is set to zero code (00hex) and active. The 16-bit serial register is cleared to 0000hex. LOUT is reset to zero. Table 1. Input Shift Register DATA BITS Shutdown Mode When programmed to shutdown mode, the outputs of DAC A and B go into a high-impedance state. Virtually no current flows into or out of the buffer amplifiers in that state.
PAGE 11
Low-Cost, Triple, 8-Bit Voltage-Output DACs with Serial Interface MAX512/MAX513 Table 2.
PAGE 12
MAX512/MAX513 Low-Cost, Triple, 8-Bit Voltage-Output DACs with Serial Interface CS tCSPWH tCSS tCSH tCH SCLK tCL tDS tDH DIN tOD LOUT Figure 3. MAX512/MAX513 Detailed Serial-Interface Timing Diagram _____________ Applications Information Power-Supply and Reference Operating Ranges The MAX512 is fully specified to operate with VDD = 5V ±10% and VSS = GND = 0V. The MAX513 is specified for single-supply operation with VDD ranging from 2.7V to 3.
PAGE 13
Low-Cost, Triple, 8-Bit Voltage-Output DACs with Serial Interface DAC CONTENTS ANALOG OUTPUT B7 B6 B5 B4 B3 B2 B1 B0 MAX512/MAX513 Table 3. Unipolar Code Table Table 4.
PAGE 14
MAX512/MAX513 Low-Cost, Triple, 8-Bit Voltage-Output DACs with Serial Interface REFAB VDD REFC DIN 1 R* CS 2 12 SCLK 3 DAC LATCH A 16-BIT SHIFT REGISTER CONTROL (8) DATA (8) R* 11 8 OUTA DAC A DAC LATCH B DAC B DAC LATCH C DAC C 0.05µF 0.1µF VSS R* 9 OUTB 0.1µF VDD 0.1µF 10 OUTC 0.1µF 14 LATCH 5 VSS 7 VDD VSS 0.22µF VOUT ICL7612A** MAX512 MAX513 VDD VOUT ICL7612A** R* RESET 4 0.1µF LOUT VSS GND 6 0.22µF * R IN 10kΩ RANGE ** CONNECT PIN 8 TO GND Figure 4.
PAGE 15
Low-Cost, Triple, 8-Bit Voltage-Output DACs with Serial Interface PART TEMP. RANGE ___________________Chip Topography PIN-PACKAGE MAX512EPD -40°C to +85°C 14 Plastic DIP MAX512ESD MAX512MJD MAX513CPD -40°C to +85°C -55°C to +125°C 0°C to +70°C 14 SO 14 CERDIP 14 Plastic DIP MAX513CSD MAX513C/D MAX513EPD MAX513ESD MAX513MJD 0°C to +70°C 0°C to +70°C -40°C to +85°C -40°C to +85°C -55°C to +125°C 14 SO Dice* 14 Plastic DIP 14 SO 14 CERDIP OUTC OUTB OUTA V SS GND V DD REFC REFAB 0.122" (3.
PAGE 16
MAX512/MAX513 Low-Cost, Triple, 8-Bit Voltage-Output DACs with Serial Interface ________________________________________________________Package Information DIM D1 A A1 A2 A3 B B1 C D D1 E E1 e eA eB L α E E1 D A3 A A2 L A1 INCHES MAX MIN 0.200 – – 0.015 0.150 0.125 0.080 0.055 0.022 0.016 0.065 0.050 0.012 0.008 0.765 0.735 0.080 0.050 0.325 0.300 0.280 0.240 0.100 BSC 0.300 BSC 0.400 – 0.150 0.115 15˚ 0˚ MILLIMETERS MIN MAX – 5.08 0.38 – 3.18 3.81 1.40 2.03 0.41 0.56 1.27 1.65 0.20 0.30 18.67 19.