Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsData collecting ICsData acquisition IC - DA converter (DAC) SOT 23 8

General Description

The MAX5223 contains two 8-bit, buffered, voltage out-

put digital-to-analog converters (DAC A and DAC B) in a

small 8-pin SOT23 package. DAC outputs can source

and sink 1mA to within 100mV of ground and V

. The

MAX5223 operates with a single +2.7V to +5.5V supply.

The device uses a 3-wire serial interface, which oper-

ates at clock rates up to 25MHz and is compatible with

SPI™, QSPI™, and MICROWIRE™ interface standards.

The serial input shift register is 16 bits long and con-

sists of 8 bits of DAC input data and 8 bits for DAC

selection and shutdown control. DAC registers can be

loaded independently or in parallel at the positive edge

of CS.

The MAX5223’s ultra-low power consumption and tiny

8-pin SOT23 package make it ideal for portable and

battery-powered applications. Supply current is a low

100µA and drops below 1µA in shutdown mode. In

addition, the reference input is disconnected from the

REF pin during shutdown, which reduces the system’s

total power consumption.

________________________Applications

Digital Gain and Offset Adjustment

Programmable Current Source

Programmable Voltage Source

Power Amp Bias Control

VCO Tuning

Features

♦ Tiny 8-Pin SOT23 Package (3mm

3mm)

♦ Low Power Consumption

100µA Operating Current

<1µA Shutdown Current

♦ +2.7V to +5.5V Single-Supply Operation

♦ Dual Buffered Voltage Output

♦ Programmable Shutdown Mode

♦ 25MHz, 3-Wire Serial Interface

♦ SPI, QSPI, and MICROWIRE-Compatible

MAX5223

Low-Power, Dual, 8-Bit, Voltage Output

Serial DAC in 8-Pin SOT23

________________________________________________________________ Maxim Integrated Products 1

DAC

LATCH

DAC A

DAC

LATCH

DAC B

SCLK

OUTA

OUTB

DIN REF

16-BIT SHIFT REGISTER

CONTROL (8) DATA (8)

MAX5223

0.1µF

(OPTIONAL)

OUTA

OUTB

GND2

0.22µF

Functional Diagram

OUTB

OUTA

SCLK

DIN

REF

GND

MAX5223

TOP VIEW

SOT23-8

Pin Configuration

19-1895; Rev 0; 1/01

PART TEMP. RANGE PIN-PACKAGE

MAX5223EKA-T -40°C to +85°C 8 SOT23

SPI and QSPI are trademarks of Motorola, Inc.

MICROWIRE is a trademark of National Semiconductor Corp.

Ordering Information

For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

Summary of content (11 pages)

PAGE 1
9-1895; Rev 0; 1/01 Low-Power, Dual, 8-Bit, Voltage Output Serial DAC in 8-Pin SOT23 Features ♦ Tiny 8-Pin SOT23 Package (3mm ✕ 3mm) The device uses a 3-wire serial interface, which operates at clock rates up to 25MHz and is compatible with SPI™, QSPI™, and MICROWIRE™ interface standards. 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 control.
PAGE 2
MAX5223 Low-Power, Dual, 8-Bit, Voltage Output Serial DAC in 8-Pin SOT23 ABSOLUTE MAXIMUM RATINGS VDD to GND ............................................................. -0.3V to +6V All Other Pins to GND (Note 1).................. -0.3V to (VDD + 0.3V) Continuous Power Dissipation (TA = +70°C) 8-Pin SOT23 (derate 8.7mW/°C above +70°C)............696mW Operating Temperature Range ...........................-40°C to +85°C Junction Temperature ......................................................
PAGE 3
Low-Power, Dual, 8-Bit, Voltage Output Serial DAC in 8-Pin SOT23 MAX5223 ELECTRICAL CHARACTERISTICS (continued) (VDD = +2.7V to +5.5V, REF = VDD, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DYNAMIC PERFORMANCE Voltage Output Slew Rate SR CL = 100pF Voltage Output Settling Time To ±1⁄2LSB, CL = 100pF Digital Feedthrough and Crosstalk All zeros to all ones 0.15 V/µs 50 µs 0.
PAGE 4
__________________________________________Typical Operating Characteristics (VDD = +3V, TA = +25°C, unless otherwise noted.) OUTPUT VOLTAGE vs. OUTPUT SOURCE CURRENT (VDD = +5V) 2.0 1.5 1.0 4 3 2 600 500 400 300 200 100 1 0.5 0 0.01 0.1 1 10 0 0.0001 100 0.01 1 -100 0.0001 100 0.001 0.01 0.1 1 10 OUTPUT SOURCE CURRENT (mA) OUTPUT SOURCE CURRENT (mA) OUTPUT SINK CURRENT (mA) INTEGRAL NONLINEARITY vs. DIGITAL CODE DIFFERENTIAL NONLINEARITY vs.
PAGE 5
Low-Power, Dual, 8-Bit, Voltage Output Serial DAC in 8-Pin SOT23 LARGE-SIGNAL OUTPUT STEP RESPONSE CLOCK FEEDTHROUGH MAX5223 toc10 MAX5223 toc11 CH1 SCLK, 5MHz 0 TO 3V 5V/div CH2 OUT_ 10mV/div AC-COUPLED CS 2V/div OUT_ 1V/div CS = HIGH, SCLK = 5MHz 10µs/div 50ns/div VREF = VDD = +3V RL = 10kΩ, CL = 100pF POWER-UP OUTPUT GLITCH POWER-UP OUTPUT GLITCH MAX5223 toc13 MAX5223 toc12 VDD 2V/div VDD 2V/div OUT_ 50mV/div OUT_ 20mV/div 100µs/div VDD = 0 TO 5V RISE TIME = FALL TIME = 10µs 2ms/di
PAGE 6
MAX5223 Low-Power, Dual, 8-Bit, Voltage Output Serial DAC in 8-Pin SOT23 Typical Operating Characteristics (continued) (VDD = +3V, TA = +25°C, unless otherwise noted.) OUTPUT VOLTAGE NOISE (DC TO 1MHz) MAX5223 toc16 OUTA 2mV/div AC-COUPLED CH1 VDD = +3V, REF = VDD, NO LOAD, DIGITAL CODE = FF 2ms/div ______________________________________________________________Pin Description 6 PIN NAME FUNCTION 1 –—– CS Chip Select. Active-Low. Enables data to be shifted into the 16-bit shift register.
PAGE 7
Low-Power, Dual, 8-Bit, Voltage Output Serial DAC in 8-Pin SOT23 Analog Section The MAX5223 contains two 8-bit, voltage output DACs. The DACs are “inverted” R-2R ladder networks. They use complementary switches that convert 8-bit digital inputs into equivalent analog output voltages in proportion to the applied reference voltage. The MAX5223 has one reference input that is shared by DAC A and DAC B.
PAGE 8
Table 1. Input Shift Register DATA BITS in starting with UB1 (uncommitted bit), followed by the remaining control bits and the data byte. The least significant bit (LSB) of the data byte (D0) is the last bit clocked into the shift register (Figure 2). Table 3 is an example of a 16-bit input word. It performs the following functions: • 80 hex (128 decimal) loaded into DAC registers A and B. • DAC A and DAC B are active. Table 4 shows code examples and how to calculate their corresponding outputs.
PAGE 9
Low-Power, Dual, 8-Bit, Voltage Output Serial DAC in 8-Pin SOT23 MAX5223 Table 2.
PAGE 10
MAX5223 Low-Power, Dual, 8-Bit, Voltage Output Serial DAC in 8-Pin SOT23 CS tCSPWH tCSS tCSH tCH SCLK tCL tDS tDH DIN Figure 3. Detailed Serial-Interface Timing Diagram Applications Information The MAX5223 is specified for single-supply operation with V DD ranging from +2.7V to +5.5V, covering all commonly used supply voltages in +3V and +5V systems. Table 4.
PAGE 11
Low-Power, Dual, 8-Bit, Voltage Output Serial DAC in 8-Pin SOT23 SOT23, 8L.EPS 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.