Rainbow Electronics MAX5223 User Manual

General Description

The MAX5223 contains two 8-bit, buffered, voltage output 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 VDD. The MAX5223 operates with a single +2.7V to +5.5V supply.

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. 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.

MAX5223

Low-Power, Dual, 8-Bit, Voltage Output Serial DAC in 8-Pin SOT23

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VDD= +2.7V to +5.5V, REF = VDD, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.)

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

VDDto GND............................................................. -0.3V to +6V

All Other Pins to GND (Note 1).................. -0.3V to (V

+ 0.3V)

Continuous Power Dissipation (T

= +70°C)

8-Pin SOT23 (derate 8.7mW/°C above +70°C)............696mW

Operating Temperature Range ...........................-40°C to +85°C

Junction Temperature......................................................+150°C

Storage Temperature Range.............................-65°C to +150°C

Lead Temperature (soldering, 10s).................................+300°C

PARAMETER

SYMBOL CONDITIONS MIN TYP MAX

Resolution N 8

±0.3 ±1 ±0.2 ±1

±1 10

100

GND V

816

0 REF

100

500

0.7 x V

0.3 x V

0.1 ±10 10(Note 4)

VIN= 0 or V

LOAD

= 0

(Note 3)

2.7V ≤ VDD≤ 3.6V, V

REF

= 2.4V,

LOAD

= 250µA

4.5V ≤ VDD≤ 5.5V, V

REF

= 4.096V,

LOAD

= 250µA

Guaranteed monotonic, I

LOAD

= 250µA (Note 2)

LOAD

= 250µA (Note 2)INL DNL TUE

VZS

PSRR

REF

Input Capacitance

Input Current

Input Low Voltage

Input High Voltage

Output Resistance

Capacitive Load at OUT_

Output Voltage Range

Reference Input Resistance (Shutdown Mode)

Reference Input Resistance

Reference Input Capacitance

Reference Input Voltage Range

Power Supply Rejection Ratio

Zero-Code Temperature Coefficient

Zero-Code Offset

Total Unadjusted Error

Differential Nonlinearity

Integral Nonlinearity

µA

Ω

MΩ

kΩ

mV/V

µV/°C

LSB

Bits

UNITS

STATIC PERFORMANCE

REFERENCE INPUT

DAC OUTPUTS

DIGITAL INPUTS

MAX5223

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

Serial DAC in 8-Pin SOT23

_______________________________________________________________________________________ 3

Note 1: The outputs may be shorted to VDDor GND if the package power dissipation is not exceeded. Typical short-circuit current to

GND is 70mA.

Note 2: Reduced digital code range (code 24 through code 232) is due to swing limitations of the output amplifiers. See Typical

Operating Characteristics.

Note 3: Reference input resistance is code-dependent. The lowest input resistance occurs at code 55hex. See the Reference Input

section.

Note 4: Guaranteed by design. Not production tested.

ELECTRICAL CHARACTERISTICS (continued)

(VDD= +2.7V to +5.5V, REF = VDD, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.)

TIMING CHARACTERISTICS

(Figure 3, VDD= +2.7V to +5.5V, TA= T

MIN

to T

MAX

, unless otherwise noted.) (Note 4)

VDD= +3.6V

VDD= +5.5V

100 220

µA

150 275

All inputs = 0I

Supply Current

µA0.6VDD= +5.5VShutdown Supply Current

V2.7 5.5V

Supply Voltage Range

nV-s0.25All zeros to all ones

Digital Feedthrough and Crosstalk

µs

To ±1⁄2LSB, CL= 100pF

Voltage Output Settling Time

V/µs0.15CL= 100pFSRVoltage Output Slew Rate

PARAMETER SYMBOL MIN TYP MAX UNITSCONDITIONS

SERIAL INTERFACE TIMING

CONDITIONS

ns50t

CSPWH

–C—S–

Pulse Width High

ns20t

SCLK Pulse Width Low

ns20t

SCLK Pulse Width High

ns20t

DIN to SCLK Rise Hold Time

ns20t

DIN to SCLK Rise Setup Time

UNITSMIN TYP MAXSYMBOLPARAMETER

ns50t

CSS

ns50t

CSH

SCLK Rise to –C—S–Rise Setup Time

DYNAMIC PERFORMANCE

POWER SUPPLY

–C—S–

Fall to SCLK Rise Setup Time

0.04

0.08

0.06

0.12

0.10

0.16

0.14

0.18

-40

-10

5-25 2035506580

POSITIVE SUPPLY CURRENT

vs. TEMPERATURE

MAX5223 toc07

TEMPERATURE (°C)

(mA)

0.3

0.2

0.1

0.4

0.5

0.6

0.7

0.8

0.9

1.0

2345

SHUTDOWN SUPPLY CURRENT

vs. SUPPLY VOLTAGE

MAX5223 toc08

SUPPLY VOLTAGE (V)

(µA)

-40

0.1 1 10 100 1k 10k

REFERENCE SMALL SIGNAL

FREQUENCY RESPONSE

-35

-30

MAX5223 toc09

FREQUENCY (Hz)

RELATIVE OUTPUT (dB)

-20

-25

-5

-10

-15

MAX5223

Low-Power, Dual, 8-Bit, Voltage Output Serial DAC in 8-Pin SOT23

4 _______________________________________________________________________________________

__________________________________________Typical Operating Characteristics

(VDD= +3V, TA = +25°C, unless otherwise noted.)

1.0

0.5

2.0

1.5

3.0

2.5

3.5

0.001 0.10.01 1 10 100

OUTPUT VOLTAGE

vs. OUTPUT SOURCE CURRENT

MAX5223 toc01

OUTPUT SOURCE CURRENT (mA)

OUTPUT VOLTAGE (V)

-2.20

-0.15

-0.10

-0.05

0.05

0.10

0.15

0.20

0 10050 150 200 250 300

INTEGRAL NONLINEARITY

vs. DIGITAL CODE

MAX5223 toc04

CODE

INL (LSB)

0.0001 0.01 1 100

OUTPUT VOLTAGE vs.

OUTPUT SOURCE CURRENT (V

= +5V)

MAX5223 toc02

OUTPUT SOURCE CURRENT (mA)

OUTPUT VOLTAGE (V)

-100

100

400 300 200

700 600 500

800

0.0001 0.010.001 0.1 1 10

OUTPUT VOLTAGE

vs. OUTPUT SINK CURRENT

MAX5223 toc03

OUTPUT SINK CURRENT (mA)

OUTPUT VOLTAGE (mV)

-0.10

-0.04

-0.06

-0.08

-0.02

0.02

0.04

0.06

0.08

0.10

0 10050 150 200 250 300

DIFFERENTIAL NONLINEARITY

vs. DIGITAL CODE

MAX5223 toc05

CODE

DNL (LSB)

0.02

0.04

0.06

0.08

0.10

0.12

0.14

0.16

2345

POSITIVE SUPPLY CURRENT

vs. SUPPLY VOLTAGE

MAX5223 toc06

VDD (V)

(mA)

+ 7 hidden pages