Maxim MAX525BMJP, MAX525BEPP, MAX525BEAP, MAX525BCPP, MAX525BCAP Datasheet

__________________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 via 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

via 3-Wire Serial Interface

♦ User-Programmable Digital Output

MAX525

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

with Serial Interface

________________________________________________________________

Maxim Integrated Products

1

MAX525

OUTA

FBA

FBB

FBC

FBD

DAC A

DAC B

DAC C

DAC D

REFAB

DAC

REGISTER A

DECODE

CONTROL

INPUT

REGISTER A

DAC

REGISTER B

INPUT

REGISTER B

DAC

REGISTER C

INPUT

REGISTER C

DAC

REGISTER D

INPUT

REGISTER D

16-BIT

SHIFT

REGISTER

SR

CONTROL

LOGIC

OUTPUT

CS

DIN

SCLK

OUTB

OUTC

OUTD

DOUT

PDL

CL

V

DD

AGND

DGND

UPO REFCD

_________________________________________________________________________Functional Diagram

19-1098; Rev 1; 12/96

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 on last page.

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 free samples & the latest literature: http://www.maxim-ic.com, or phone [phone].
For small orders, phone [phone] ext. 3468.

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, 10sec).............................+300°C

Code-dependent, minimum at code 555 hex

4.5V ≤ VDD≤ 5.5V

Guaranteed monotonic

CONDITIONS

kΩ10R

REF

Reference Input Resistance

V0 V

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 (Note 1) -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

= 0.67Vp-p

Rail to rail (Note 2)

To ±1/2LSB, V

STEP

= 2.5V

VIN= 0V or V

DD

V

REF

= 1Vp-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

= 3.6Vp-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

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 0.67Vp-p
R

L

= 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

0.50

0

1

100

TOTAL HARMONIC DISTORTION PLUS NOISE

vs. FREQUENCY

0.05

MAX525-05

FREQUENCY (kHz)

THD + NOISE (%)

0.15

0.25

0.35

10

0.45

0.10

0.20

0.30

0.40

DAC CODE = ALL 1s
REFAB = 1Vp-p
R

L

= 5kΩ

C

L

= 100pF

-100

0.5 1.6 3.8

OUTPUT FFT PLOT

-60

0

MAX525-10

FREQUENCY (kHz)

SIGNAL AMPLITUDE (dB)

2.7 4.9 6.0

-20

-40

-80

V

REF

= 1kHz, 0.006V TO 3.6V

R

L

= 5kΩ

C

L

= 100pF

____________________________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

0

-5

0.01 0.1 1 10 100

FULL-SCALE ERROR

vs. LOAD

-4

MAX525-09

LOAD (kΩ)

FULL-SCALE ERROR (LSB)

-3

-2

-1

-100

0.5 1.2 2.6

REFERENCE FEEDTHROUGH

AT 1kHz

-60

0

MAX525-11

FREQUENCY (kHz)

SIGNAL AMPLITUDE (dB)

1.9 3.3 4.0

-20

-40

-80

OUTA FEEDTHROUGH

REFAB INPUT SIGNAL

V

REF

= 3.6Vp-p @ 1kHz

R

L

= 5kΩ

C

L

= 100pF