Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsData collecting ICsData acquisition IC - DA converter (DAC) uMAX 8

General Description

The MAX5304 combines a low-power, voltage-output,

10-bit digital-to-analog converter (DAC) and a precision

output amplifier in an 8-pin µMAX package. It operates

from a single +5V supply, drawing less than 280µA of

supply current.

The output amplifier’s inverting input is available to the

user, allowing specific gain configurations, remote

sensing, and high output-current capability. This makes

the MAX5304 ideal for a wide range of applications,

including industrial process control. Other features

include a software shutdown and power-on reset.

The serial interface is SPI™/QSPI™/MICROWIRE™

compatible. The DAC has a double-buffered input,

organized as an input register followed by a DAC regis-

ter. A 16-bit serial word loads data into the input regis-

ter. The DAC register can be updated independently or

simultaneously with the input register. All logic inputs

are TTL/CMOS-logic compatible and buffered with

Schmitt triggers to allow direct interfacing to optocou-

plers.

Applications

Digital Offset and Gain Adjustment

Industrial Process Control

Microprocessor-Controlled Systems

Portable Test Instruments

Remote Industrial Control

Features

♦ 10-Bit DAC with Configurable Output Amplifier

♦ +5V Single-Supply Operation

♦ Low Supply Current

0.28mA Normal Operation

2µA Shutdown Mode

♦ Available in 8-Pin µMAX

♦ Power-On Reset Clears DAC Output to Zero

♦ SPI/QSPI/MICROWIRE Compatible

♦ Schmitt-Trigger Digital Inputs for Direct

Optocoupler Interface

MAX5304

10-Bit Voltage-Output DAC

in 8-Pin µMAX

________________________________________________________________ Maxim Integrated Products 1

MAX5304

OUT

DIN

SCLK

DAC

REF

DAC

INPUT

CONTROL

GND

16-BIT

SHIFT

Functional Diagram

REF

DIN

SCLK

GND

OUT

MAX5304

µMAX

TOP VIEW

Pin Configuration

19-1562; Rev 0; 10/99

PART

MAX5304CUA

MAX5304EUA -40°C to +85°C

0°C to +70°C

TEMP. RANGE PIN-PACKAGE

8 µMAX

_________________Ordering Information

SPI and QSPI are trademarks of Motorola, Inc.

MICROWIRE is a trademark of National Semiconductor Corp.

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.

Summary of content (12 pages)

PAGE 1
9-1562; Rev 0; 10/99 10-Bit Voltage-Output DAC in 8-Pin µMAX Applications Digital Offset and Gain Adjustment Features ♦ 10-Bit DAC with Configurable Output Amplifier ♦ +5V Single-Supply Operation ♦ Low Supply Current 0.28mA Normal Operation 2µA Shutdown Mode ♦ Available in 8-Pin µMAX ♦ Power-On Reset Clears DAC Output to Zero ♦ SPI/QSPI/MICROWIRE Compatible ♦ Schmitt-Trigger Digital Inputs for Direct Optocoupler Interface _________________Ordering Information PART TEMP.
PAGE 2
MAX5304 10-Bit Voltage-Output DAC in 8-Pin µMAX ABSOLUTE MAXIMUM RATINGS VDD to GND...............................................................-0.3V to +6V REF, OUT, FB to GND.................................-0.3V to (VDD + 0.3V) Digital Inputs to GND................................................-0.3V to +6V Continuous Current into Any Pin.......................................±20mA Continuous Power Dissipation (TA = +70°C) 8-Pin µMAX (derate 4.10mW/°C above+70°C) ..........
PAGE 3
10-Bit Voltage-Output DAC in 8-Pin µMAX (Circuit of Figure 8, VDD = +5V ±10%, VREF = +2.5V, RL = 5kΩ, CL = 100pF, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C. Output buffer connected in unity-gain configuration.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DIGITAL INPUTS DYNAMIC PERFORMANCE Voltage Output Slew Rate SR Output Settling Time To ±1/2LSB, VSTEP = 2.5V Output Voltage Swing Rail-to-rail (Note 2) 0.6 V/µs 10 µs 0 to VDD V Current into FB 0.
PAGE 4
__________________________________________Typical Operating Characteristics (VDD = +5V, RL = 5kΩ, CL = 100pF, TA = +25°C, unless otherwise noted.) REFERENCE VOLTAGE INPUT FREQUENCY RESPONSE -0.025 360 SUPPLY CURRENT (µA) RELATIVE OUTPUT (dB) 0 RL = ∞ 380 -4 0.025 INL (LSB) 400 MAX5304-02 0 MAX5304-01 0.050 SUPPLY CURRENT vs. TEMPERATURE MAX5304-03 INTEGRAL NONLINEARITY vs. REFERENCE VOLTAGE -8 -12 -16 340 320 300 280 260 240 220 -20 0.4 1.2 2.0 2.8 3.6 0 4.
PAGE 5
10-Bit Voltage-Output DAC in 8-Pin µMAX (VDD = +5V, RL = 5kΩ, CL = 100pF, TA = +25°C, unless otherwise noted.
PAGE 6
MAX5304 10-Bit Voltage-Output DAC in 8-Pin µMAX _____________________Pin Description FB PIN NAME FUNCTION 1 OUT 2 CS Chip-Select Input. Active low. 3 DIN Serial-Data Input 4 SCLK Serial-Clock Input 5 FB 6 REF Reference Voltage Input REF 7 GND Ground AGND 8 VDD Positive Power Supply DAC Output Voltage R 2R 2R R 2R OUT R 2R 2R MSB DAC Output Amplifier Feedback SHOWN FOR ALL 1s ON DAC Figure 1.
PAGE 7
10-Bit Voltage-Output DAC in 8-Pin µMAX MAX5304 SCLK SK DIN SO CS I/O MAX5304 In shutdown mode, the amplifier’s output and the reference input enter a high-impedance state. The serial interface remains active. Data in the input register is retained in shutdown, allowing the MAX5304 to recall the output state prior to entering shutdown. Exit shutdown mode by either recalling the previous configuration or updating the DAC with new data.
PAGE 8
MAX5304 10-Bit Voltage-Output DAC in 8-Pin µMAX Table 1. Serial-Interface Programming Commands 16-BIT16-BIT SERIAL SERIAL WORDWORD C2 C1 FUNCTION C0 D9.......................D0 MSB LSB S2...S0 X 0 0 10 bits of data 000 Load input register; DAC register immediately updated (also exit shutdown). X 0 1 10 bits of data 000 Load input register; DAC register unchanged. X 1 0 XXXXXXXXXX XXX Update DAC register from input register (also exit shutdown; recall previous state).
PAGE 9
10-Bit Voltage-Output DAC in 8-Pin µMAX MAX5304 DIN SCLK CS1 CS2 TO OTHER SERIAL DEVICES CS3 CS CS CS MAX5304 MAX5304 MAX5304 SCLK SCLK SCLK DIN DIN DIN Figure 7. Multiple MAX5304s Sharing Common DIN and SCLK Lines Figure 7 shows a method of connecting several MAX5304s. In this configuration, the clock and the data bus are common to all devices, and separate chipselect lines are used for each IC. Applications Information Table 2.
PAGE 10
MAX5304 10-Bit Voltage-Output DAC in 8-Pin µMAX Table 3.
PAGE 11
10-Bit Voltage-Output DAC in 8-Pin µMAX MAX5304 +5V R1 R2 REF +5V 26k AC REFERENCE INPUT +5V VDD MAX495 500mVp-p V+ FB 10k VDD REF VOUT DAC OUT DAC V- OUT MAX5304 GND MAX5304 GND R1 = R2 = 10kΩ ±0.1% Figure 10. Bipolar Output Circuit Figure 11. AC Reference Input Circuit Power-Supply Considerations +5V REF VDD VL MAX5304 IOUT DAC OUT 2N3904 FB GND R Figure 12. Digitally Programmable Current Source On power-up, the input and DAC registers are cleared (set to zero code).
PAGE 12
10-Bit Voltage-Output DAC in 8-Pin µMAX 8LUMAXD.EPS MAX5304 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.