Instruction Manual

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General Description

The MAX5230/MAX5231 low-power, dual 12-bit voltage-

output digital-to-analog converters (DACs) feature an

internal 3ppm/°C precision bandgap voltage reference

and precision output amplifiers. The MAX5231 operates

on a single 5V supply with an internal 2.5V reference and

features a 4.095V full-scale output range. The MAX5230

operates on a single 3V supply with an internal 1.25V ref-

erence and features a 2.0475V full-scale output range.

The MAX5231 consumes only 470µA while the MAX5230

consumes only 420µA of supply current. Both devices

feature low-power (2µA) software- and hardware-

enabled shutdown modes.

The MAX5230/MAX5231 feature a 13.5MHz SPI™-,

QSPI™-, and MICROWIRE™-compatible 3-wire serial

interface. An additional data output (DOUT) allows for

daisy-chaining and read back. Each DAC has a double-

buffered digital input. The MAX5230/MAX5231 feature

two software-selectable shutdown output impedances:

1kΩ or 200kΩ. A power-up reset feature sets DAC out-

puts at ground or at the midscale DAC code.

The MAX5230/MAX5231 are specified over the extended

temperature range (-40°C to +85°C) and are available in

16-pin QSOP packages.

Applications

Industrial Process Controls

Automatic Test Equipment

Digital Offset and Gain Adjustment

Motion Control

µP-Controlled Systems

Features

♦ Internal 3ppm/°C Precision Bandgap Reference

2.465V (MAX5231)

1.234V (MAX5230)

♦ 10ppm/°C (max) Full-Scale Output Range

4.095V (MAX5231)

2.0475V (MAX5230)

♦ Single-Supply Operation

5V (MAX5231)

3V (MAX5230)

♦ Low Supply Current

470µA (MAX5231)

420µA (MAX5230)

♦ 13.5MHz SPI/QSPI/MICROWIRE-Compatible,

3-Wire Serial Interface

♦ Pin-Programmable Power-Up Reset State to Zero

or Midscale Output Voltage

♦ Programmable Shutdown Modes with 1kΩ or

200kΩ Internal Output Loads

♦ Recalls Output State Prior to Shutdown or Reset

♦ Buffered Output Drives 5kΩ || 100pF Loads

♦ Space-Saving 16-Pin QSOP Package

MAX5230/MAX5231

3V/5V, 12-Bit, Serial Voltage-Output Dual DACs

with Internal Reference

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

19-2332; Rev 0; 1/02

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

Functional Diagram appears at end of data sheet.

SPI and QSPI are trademarks of Motorola, Inc.

MICROWIRE is a trademark of National Semiconductor, Corp.

PART TEMP RANGE

PIN-

PACKAGE

INL

(LSB)

MAX5230AEEE -40°C to +85°C 16 QSOP ±0.5

MAX5230BEEE -40°C to +85°C 16 QSOP ±1

MAX5231AEEE -40°C to +85°C 16 QSOP ±0.5

MAX5231BEEE -40°C to +85°C 16 QSOP ±1

OSA OSB

OUTB

AGND

REF

PDL

DOUT

DGND

TOP VIEW

MAX5230

MAX5231

QSOP

OUTA

RSTV

DIN

CLR

LDAC

SCLK

Pin Configuration

Summary of content (18 pages)

PAGE 1
9-2332; Rev 0; 1/02 3V/5V, 12-Bit, Serial Voltage-Output Dual DACs with Internal Reference The MAX5230/MAX5231 feature a 13.5MHz SPI™-, QSPI™-, and MICROWIRE™-compatible 3-wire serial interface. An additional data output (DOUT) allows for daisy-chaining and read back. Each DAC has a doublebuffered digital input. The MAX5230/MAX5231 feature two software-selectable shutdown output impedances: 1kΩ or 200kΩ. A power-up reset feature sets DAC outputs at ground or at the midscale DAC code.
PAGE 2
MAX5230/MAX5231 3V/5V, 12-Bit, Serial Voltage-Output Dual DACs with Internal Reference ABSOLUTE MAXIMUM RATINGS VDD to AGND, DGND ...............................................-0.3V to +6V AGND to DGND.....................................................-0.3V to +0.3V Digital Inputs to DGND.............................................-0.3V to +6V Digital Output (DOUT) to DGND...................-0.3V to VDD + 0.3V OUT_ to AGND .............................................-0.3V to VDD + 0.3V OS_ to AGND....
PAGE 3
V/5V, 12-Bit, Serial Voltage-Output Dual DACs with Internal Reference (VDD = +4.5V to +5.5V, OS_ = AGND = DGND = 0, RL = 5kΩ, CL = 100pF, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL CONDITIONS MIN To ±0.5LSB, VSTEP = ±4V (VDD - 0.25V) ≥ VOUT ≥ 0.
PAGE 4
MAX5230/MAX5231 3V/5V, 12-Bit, Serial Voltage-Output Dual DACs with Internal Reference ELECTRICAL CHARACTERISTICS—MAX5230 (continued) (VDD = +2.7V to +3.6V, OS_ = AGND = DGND = 0, RL = 5kΩ, CL = 100pF, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER Reference External Load Regulation SYMBOL CONDITIONS MIN VOUT/IOUT 0 ≤ IOUT ≤ 100µA (sourcing) Reference Short-Circuit Current TYP MAX UNITS 0.
PAGE 5
3V/5V, 12-Bit, Serial Voltage-Output Dual DACs with Internal Reference (VDD = +2.7V to +3.6V, OS_ = AGND = DGND = 0, RL = 5kΩ, CL = 100pF, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS 3.6 V 420 475 µA Full power-down mode 0.
PAGE 6
TIMING CHARACTERISTICS—MAX5230 (VDD = +2.7V to +3.6V, AGND = DGND = 0, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.
PAGE 7
3V/5V, 12-Bit, Serial Voltage-Output Dual DACs with Internal Reference 0 -0.05 420 440 410 -0.10 -0.15 500 1000 1500 2000 2500 3000 3500 4000 430 420 410 400 0 400 -40 -15 10 35 60 85 -40 -15 10 35 60 85 DIGITAL INPUT CODE TEMPERATURE (°C) TEMPERATURE (°C) SUPPLY CURRENT vs. SUPPLY VOLTAGE (MAX5230) SUPPLY CURRENT vs. SUPPLY VOLTAGE (MAX5231) FULL POWER-DOWN SUPPLY CURRENT vs. TEMPERATURE (MAX5230) 415 410 480 475 470 MAX5230/MAX5231 toc09 420 485 0.80 0.
PAGE 8
Typical Operating Characteristics (continued) (VDD = +3V (MAX5230), VDD = +5V (MAX5231), RL = 5kΩ, CL = 100pF, OS_ = AGND, both DACs enabled with full-scale output code, TA = +25°C, unless otherwise noted.) 240 235 375 230 370 365 360 355 NO LOAD -15 10 35 60 85 -40 2.0470 2.0465 2.0460 350 -15 10 35 60 -40 85 -15 10 35 60 85 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) FULL-SCALE OUTPUT VOLTAGE vs. TEMPERATURE (MAX5231) FULL-SCALE ERROR vs.
PAGE 9
3V/5V, 12-Bit, Serial Voltage-Output Dual DACs with Internal Reference MAX5230/MAX5231 Typical Operating Characteristics (continued) (VDD = +3V (MAX5230), VDD = +5V (MAX5231), RL = 5kΩ, CL = 100pF, OS_ = AGND, both DACs enabled with full-scale output code, TA = +25°C, unless otherwise noted.
PAGE 10
MAX5230/MAX5231 3V/5V, 12-Bit, Serial Voltage-Output Dual DACs with Internal Reference Pin Description PIN NAME 1 OSA FUNCTION 2 OUTA DAC A Output 3 RSTV Reset Value Input 1: Connect to VDD to select midscale as the reset value. 0: Connect to DGND to select zero as the reset value. 4 LDAC Load DACs A and B 5 CLR Clear Input. Both DAC outputs go to zero or midscale. Clears both DAC internal registers (input register and DAC register) to its predetermined (RSTV) state.
PAGE 11
3V/5V, 12-Bit, Serial Voltage-Output Dual DACs with Internal Reference MAX5230/MAX5231 tLDL tCSLD LDAC tCSW CS tCSO tCSS tCSH tCS1 SCLK tCH tCL tCP DIN tDS tDH tD02 tD01 DOUT Figure 2. Detailed Serial Interface Timing Detailed Description The MAX5230/MAX5231 12-bit, voltage-output DACs are easily configured with a 3-wire SPI-, QSPI-, MICROWIRE-compatible serial interface.
PAGE 12
MAX5230/MAX5231 3V/5V, 12-Bit, Serial Voltage-Output Dual DACs with Internal Reference ously. The control bits and D11–D8 allow the DACs to operate independently. Table 1. Serial Data Format MSB <------------16-bits of serial data ------------> LSB 3 Control Bits MSB .. 12 Data Bits ... LSB Sub-Bit C2…C0 D11 ..............................
PAGE 13
3V/5V, 12-Bit, Serial Voltage-Output Dual DACs with Internal Reference Full power-down mode shuts down the main bias generator, reference, and both DACs. The shutdown impedance of the DAC outputs can still be controlled independently, as described in Tables 2 and 3. A serial interface command exits shutdown mode and updates a DAC register. Each DAC can exit shutdown at the same time or independently (see Tables 2 and 3).
PAGE 14
Applications Information Definitions Integral Nonlinearity (INL) Integral nonlinearity (Figure 6a) is the deviation of the values on an actual transfer function from a straight line. This straight line can be either a best-straight-line fit (closest approximation to the actual transfer curve) or a line drawn between the endpoints of the transfer function, once offset and gain errors have been nullified. For a DAC, the deviations are measured at every single step.
PAGE 15
3V/5V, 12-Bit, Serial Voltage-Output Dual DACs with Internal Reference V+ DAC CONTENTS ANALOG OUTPUT (V) MSB LSB MAX5230 MAX5231 1111 1111 1 1000 0000 0 1000 0000 0 0111 1111 1 0000 0000 0000 0000 0 111 (0) 001 (0) 000 (0) 111 (0) 001 (0) 000 (0) 2.04750 1.02425 1.02375 1.02325 0.00050 0 4.0950 2.0485 2.0475 2.0465 0.0010 0 5V/3V REF PHOTODIODE VDD REF OS_ 121kΩ V+ 77.25kΩ Digital Feedthrough Digital feedthrough is noise generated on the DAC’s output when any digital input transitions.
PAGE 16
MAX5230/MAX5231 3V/5V, 12-Bit, Serial Voltage-Output Dual DACs with Internal Reference DIN SCLK CS1 CS2 TO OTHER SERIAL DEVICES CS3 CS CS MAX5230 MAX5231 CS MAX5230 MAX5231 MAX5230 MAX5231 SCLK SCLK SCLK DIN DIN DIN Figure 9. Multiple MAX5230/MAX5231s Sharing a Common DIN Line SCLK CS CS CS MAX5230 MAX5231 SCLK DIN DIN CS MAX5230 MAX5231 SCLK DOUT DIN TO OTHER SERIAL DEVICES MAX5230 MAX5231 SCLK DOUT DIN DOUT Figure 10.
PAGE 17
3V/5V, 12-Bit, Serial Voltage-Output Dual DACs with Internal Reference CS DOUT DIN SCLK VDD AGND DGND 121kΩ OSA 77.25kΩ AMP A DAC A PDL SR CONTROL OUTA 16-BIT SHIFT REGISTER 1kΩ 1kΩ SHUTDOWN LDAC RSTV CLR DECODE CONTROL 121kΩ OSB 1 77.25kΩ INPUT REGISTERS DAC REGISTER AMP B DAC B OUTB 1kΩ SHUTDOWN BANDGAP REFERENCE 1.25V 2X (1X) 2.5V (1.
PAGE 18
MAX5230/MAX5231 3V/5V, 12-Bit, Serial Voltage-Output Dual DACs with Internal Reference QSOP.EPS Package Information Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.