MAXIM MAX525 Technical data

__________________General Description

The MAX525 combines four low-power, voltage-output,
12-bit digital-to-analog converters (DACs) and four pre­cision output amplifiers in a space-saving, 20-pin pack­age. In addition to the four voltage outputs, each
amplifier’s negative input is also available to the user.
This facilitates specific gain configurations, remote
sensing, and high output drive capacity, making the
MAX525 ideal for industrial-process-control applica­tions. Other features include software shutdown, hard­ware shutdown lockout, an active-low reset which clears
all registers and DACs to zero, a user-programmable
logic output, and a serial-data output.

Each DAC has a double-buffered input organized as an
input register followed by a DAC register. A 16-bit serial
word loads data into each input/DAC register. The serial
interface is compatible with SPI™/QSPI™ and
MICROWIRE™. It allows the input and DAC registers to
be updated independently or simultaneously with a sin­gle software command. The DAC registers can be
simultaneously updated through the 3-wire serial inter­face. All logic inputs are TTL/CMOS-logic compatible.

________________________Applications

Industrial Process Controls
Automatic Test Equipment
Digital Offset and Gain Adjustment
Motion Control
Remote Industrial Controls
Microprocessor-Controlled Systems

______________________________Features

♦ Four 12-Bit DACs with Configurable

Output Amplifiers

♦ +5V Single-Supply Operation

♦ Low Supply Current: 0.85mA Normal Operation

10µA Shutdown Mode

♦ Available in 20-Pin SSOP

♦ Power-On Reset Clears all Registers and

DACs to Zero

♦ Capable of Recalling Last State Prior to Shutdown

♦ SPI/QSPI and MICROWIRE Compatible

♦ Simultaneous or Independent Control of DACs

through 3-Wire Serial Interface

♦ User-Programmable Digital Output

MAX525

Low-Power, Quad, 12-Bit Voltage-Output DAC

with Serial Interface

________________________________________________________________ Maxim Integrated Products 1

_________________________________________________________________________Functional Diagram

19-1098; Rev 2; 10/02

PART

MAX525ACPP

MAX525BCPP 0°C to +70°C

0°C to +70°C

TEMP RANGE PIN-PACKAGE

20 Plastic DIP

20 Plastic DIP

_________________Ordering Information

Ordering Information continued at end of data sheet.

Pin Configuration appears at end of data sheet.

INL

(LSB)

±1/2

±1

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

MAX525ACAP

MAX525BCAP 0°C to +70°C

0°C to +70°C 20 SSOP

20 SSOP

±1/2

±1

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.

DOUT

CL

16-BIT

SHIFT

REGISTER

SR

CONTROL

DIN

CS

PDL

DGND

DECODE

CONTROL

LOGIC

OUTPUT

SCLK

UPO REFCD

AGND

INPUT

REGISTER A

INPUT

REGISTER B

INPUT

REGISTER C

INPUT

REGISTER D

V

DD

REGISTER A

REGISTER B

REGISTER C

REGISTER D

DAC

DAC

DAC

DAC

MAX525

REFAB

FBA

OUTA

DAC A

FBB

OUTB

DAC B

FBC

OUTC

DAC C

FBD

OUTD

DAC D

MAX525

Low-Power, Quad, 12-Bit Voltage-Output DAC
with Serial Interface

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VDD= +5V ±10%, AGND = DGND = 0V, REFAB = REFCD = 2.5V, RL= 5kΩ, CL= 100pF, TA= T

MIN

to T

MAX

, unless otherwise

noted. Typical values are at T

A

= +25°C. Output buffer connected in unity-gain configuration (Figure 9).)

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 AGND............................................................-0.3V to +6V

V

DD

to DGND ...........................................................-0.3V to +6V

AGND to DGND ..................................................................±0.3V

REFAB, REFCD to AGND...........................-0.3V to (V

DD

+ 0.3V)

OUT_, FB_ to AGND...................................-0.3V to (V

DD

+ 0.3V)

Digital Inputs to DGND.............................................-0.3V to +6V

DOUT, UPO to DGND ................................-0.3V to (V

DD

+ 0.3V)

Continuous Current into Any Pin.......................................±20mA

Continuous Power Dissipation (T

A

= +70°C)

Plastic DIP (derate 8.00mW/°C above +70°C) .................640mW

SSOP (derate 8.00mW/°C above +70°C) ......................640mW

CERDIP (derate 11.11mW/°C above +70°C).................889mW

Operating Temperature Ranges

MAX525_C_P ........................................................0°C to +70°C

MAX525_E_P .....................................................-40°C to +85°C

MAX525_MJP ..................................................-55°C to +125°C

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

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

Code-dependent, minimum at code 555 hex

4.5V ≤ VDD≤ 5.5V

(Note 1)

Guaranteed monotonic

CONDITIONS

kΩ8R

REF

Reference Input Resistance

V0V

DD

- 1.4V

REF

Reference Input Range

LSB±0.35 ±1.0INLIntegral Nonlinearity

mVOffset Error ±1.0 ±6.0

LSB-0.8 ±2.0GEGain Error

µV/VPSRRPower-Supply Rejection Ratio 100 600

±0.25 ±0.5

Bits12NResolution

ppm/°C1Gain-Error Tempco

LSBGEGain Error -0.8 ±2.0

ppm/°C6Offset-Error Tempco

LSB

±1.0

INL

Integral Nonlinearity
(Note 1)

LSB±1.0DNLDifferential Nonlinearity

±6.0 mVV

OS

Offset Error

UNITSMIN TYP MAXSYMBOLPARAMETER

MAX525A

MAX525B

µA0.01 ±1Reference Current in Shutdown

STATIC PERFORMANCE—ANALOG SECTION

MATCHING PERFORMANCE (TA= +25°C)

REFERENCE INPUT

MAX525

Low-Power, Quad, 12-Bit Voltage-Output DAC

with Serial Interface

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(VDD= +5V ±10%, AGND = DGND = 0V, REFAB = REFCD = 2.5V, RL= 5kΩ, CL= 100pF, TA= T

MIN

to T

MAX

, unless otherwise

noted. Typical values are at T

A

= +25°C. Output buffer connected in unity-gain configuration (Figure 9).)

(Note 3)

CS = VDD, DIN = 100kHz

V

REF

= 0.67V

P-P

Rail-to-Rail®(Note 2)

To ±1/2LSB, V

STEP

= 2.5V

VIN= 0V or V

DD

V

REF

= 1V

P-P

at 25kHz

I

SINK

= 2mA

I

SOURCE

= 2mA

CONDITIONS

mA0.85 0.98I

DD

Supply Current

V4.5 5.5V

DD

Supply Voltage

nV-s5Digital Crosstalk

nV-s5Digital Feedthrough

µs15

Start-Up Time Exiting
Shutdown Mode

µA0 0.1Current into FB_

V0 to V

DD

Output Voltage Swing

µs12Output Settling Time

V/µs0.6SRVoltage Output Slew Rate

V0.13 0.4V

OL

Output Low Voltage

VVDD- 0.5V

OH

Output High Voltage

kHz650Reference -3dB Bandwidth

pF8C

IN

Input Capacitance

µA0.01 ±1.0I

IN

Input Leakage Current

V0.8V

IL

Input Low Voltage

dB72SINAD

Signal-to-Noise Plus
Distortion Ratio

V2.4V

IH

Input High Voltage

UNITSMIN TYP MAXSYMBOLPARAMETER

Input code = all 0s, V

REF

= 3.6V

P-P

at 1kHz dB-84Reference Feedthrough

(Note 3) µA10 20Supply Current in Shutdown

µA0.01 ±1Reference Current in Shutdown

Note 1: Guaranteed from code 11 to code 4095 in unity-gain configuration.
Note 2: Accuracy is better than 1.0LSB for V

OUT

= 6mV to VDD- 60mV, guaranteed by PSR test on end points.

Note 3: R

L

= ∞, digital inputs at DGND or VDD.

RL= ∞

µA0.01 ±1

OUT_ Leakage Current
in Shutdown

MULTIPLYING-MODE PERFORMANCE

DIGITAL INPUTS

DIGITAL OUTPUTS

DYNAMIC PERFORMANCE

POWER SUPPLIES

Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.

70

1000

950

900

850

800

750

700

650

600

550

500

-55 -40 -20 0 20 40 60 80 100 120

MAX525-03

SUPPLY CURRENT (µA)

SUPPLY CURRENT

vs. TEMPERATURE

TEMPERATURE (°C)

CODE = FFF HEX

INL (LSB)

-0.5

0.4 0.8 1.2 1.6 2.0 2.4 2.8 3.2 3.6 4.0
REFERENCE VOLTAGE (V)

MAX525-01

4.4

0.3

0.2

0.1

0

-0.1

-0.2

-0.3

-0.4
RL = 5kΩ

INTEGRAL NONLINEARITY
vs. REFERENCE VOLTAGE

0

-4

-8

-12

-16

-20
0 500k 1M 1.5M 2M 2.5M 3M

MAX525-02

RELATIVE OUTPUT (dB)

REFERENCE VOLTAGE INPUT

FREQUENCY RESPONSE

FREQUENCY (Hz)

REFAB SWEPT 0.67V

P-P

RL = 5kΩ
C

L

= 100pF

__________________________________________Typical Operating Characteristics

(V

DD

= +5V, TA = +25°C, unless otherwise noted.)

MAX525

Low-Power, Quad, 12-Bit Voltage-Output DAC
with Serial Interface

4 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

(VDD= +5V ±10%, AGND = DGND = 0V, REFAB = REFCD = 2.5V, RL= 5kΩ, CL= 100pF, TA= T

MIN

to T

MAX

, unless otherwise

noted. Typical values are at T

A

= +25°C. Output buffer connected in unity-gain configuration (Figure 9).)

CONDITIONS

t

D02

SCLK Fall to DOUT Valid
Propagation Delay

t

D01

SCLK Rise to DOUT Valid
Propagation Delay

ns100t

CP

SCLK Clock Period

ns0t

DH

DIN Hold Time

ns40t

DS

DIN Setup Time

ns0t

CSH

SCLK Rise to CS Rise Hold Time

ns40t

CSS

CS Fall to SCLK Rise Setup Time

ns40t

CH

SCLK Pulse Width High

ns40t

CL

SCLK Pulse Width Low

UNITSMIN TYP MAXSYMBOLPARAMETER

ns100t

CSW

CS Pulse Width High

ns40t

CS1

CS Rise to SCLK Rise Hold Time

ns40t

CS0

SCLK Rise to CS Fall Delay

C

LOAD

= 200pF

C

LOAD

= 200pF

80

80

TIMING CHARACTERISTICS (Figure 6)

ns

ns

MAX525

Low-Power, Quad, 12-Bit Voltage-Output DAC

with Serial Interface

_______________________________________________________________________________________ 5

____________________________Typical Operating Characteristics (continued)

(V

DD

= +5V, TA = +25°C, unless otherwise noted.)

4.0 4.2 4.64.4 4.8 5.0 5.2 5.4 5.6

SUPPLY CURRENT

vs. SUPPLY VOLTAGE

MAX525-04

SUPPLY VOLTAGE (V)

SUPPLY CURRENT (µA)

1000

950

900

850

800

750

700

650

600

CODE = FFF HEX

TOTAL HARMONIC DISTORTION PLUS NOISE

0.50
DAC CODE = ALL 1s

0.45
REFAB = 1V

RL = 5kΩ

0.40
C

L

0.35

0.30

0.25

0.20

THD + NOISE (%)

0.15

0.10

0.05

0

1

FULL-SCALE ERROR

vs. LOAD

0

-1

-2

= 100pF

vs. FREQUENCY

P-P

10

FREQUENCY (kHz)

MAX525-09

-20

-40

MAX525-05

100

REFERENCE FEEDTHROUGH

0

REFAB INPUT SIGNAL

0

-20

-40

-60

SIGNAL AMPLITUDE (dB)

-80

-100

0.5 1.6 3.8

AT 1kHz

V

= 3.6V

P-P

AT 1kHz

REF

= 5kΩ

R

L

= 100pF

C

L

OUTPUT FFT PLOT

V

= 1kHz, 0.006V TO 3.6V

REF

= 5kΩ

R

L

= 100pF

C

L

2.7 4.9 6.0

FREQUENCY (kHz)

MAX525-11

MAX525-10

-3

FULL-SCALE ERROR (LSB)

-4

-5

0.01 0.1 1 10 100
LOAD (kΩ)

-60

SIGNAL AMPLITUDE (dB)

-80

-100

0.5 1.2 2.6

OUTA FEEDTHROUGH

FREQUENCY (kHz)

1.9 3.3 4.0