Rainbow Electronics MAX5250 User Manual

19-1171; Rev 0; 12/96

Low-Power, Quad, 10-Bit Voltage-Output DAC

with Serial Interface

__________________General Description

The +5V MAX5250 combines four low-power, voltage­output, 10-bit digital-to-analog converters (DACs) and
four precision output amplifiers in a space-saving, 20­pin 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
MAX5250 ideal for industrial-process-control applica­tions. Other features include software shutdown, hard­ware shutdown lockout, an active-low reset that 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
3-wire serial interface is compatible with SPI™/QSPI™
and Microwire™. It allows the input and DAC registers to

______________________________Features

♦ Four 10-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 and DIP Packages
♦ Power-On Reset Clears all Registers and

DACs to Zero

♦ SPI/QSPI and Microwire Compatible
♦ Simultaneous or Independent Control of DACs

via 3-Wire Serial Interface

♦ User-Programmable Digital Output
♦ Schmitt-Trigger Inputs for Direct Optocoupler

Interface

♦ 12-Bit Upgrade Available: MAX525

be updated independently or simultaneously with a sin­gle software command. All logic inputs are TTL/CMOS-

_________________Ordering Information

logic compatible.

INL

(LSB)

±1/2
±1
±1/2

________________________Applications

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

PART

MAX5250ACPP
MAX5250BCPP
MAX5250ACAP 0°C to +70°C
MAX5250BCAP 0°C to +70°C 20 SSOP ±1

Ordering Information continued on last page.
Pin Configuration appears at end of data sheet.

TEMP. RANGE PIN-PACKAGE

0°C to +70°C
0°C to +70°C

20 Plastic DIP
20 Plastic DIP
20 SSOP

Motion Control

_________________________________________________________________________Functional Diagram

MAX5250

DOUT

CL

16-BIT

SHIFT

REGISTER

SR

CONTROL

DIN

CS

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

________________________________________________________________

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

MAX5250

REFAB

DAC A

DAC B

DAC C

DAC D

FBA
OUTA

FBB
OUTB

FBC
OUTC

FBD
OUTD

Maxim Integrated Products

1

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

Low-Power, Quad, 10-Bit Voltage-Output DAC
with Serial Interface

ABSOLUTE MAXIMUM RATINGS

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

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

V

DD

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

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

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

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

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

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

DD
DD

DD

+ 0.3V)
+ 0.3V)

+ 0.3V)

MAX5250

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.

Continuous Power Dissipation (T

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

MAX5250_C_P......................................................0°C to +70°C

MAX5250_E_P ...................................................-40°C to +85°C

MAX5250BMJP................................................-55°C to +125°C

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

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

ELECTRICAL CHARACTERISTICS

(VDD= +5V ±10%, AGND = DGND = 0V, REFAB = REFCD = 2.5V, RL= 5kΩ, CL= 100pF, TA= T
noted. Typical values are at T

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

A

= +70°C)

A

to T

MIN

, unless otherwise

MAX

PARAMETER SYMBOL MIN TYP MAX UNITS

STATIC PERFORMANCE—ANALOG SECTION

Resolution N 10 Bits
Integral Nonlinearity

(Note 1)
Differential Nonlinearity DNL ±1.0 LSB

Offset Error V
Offset-Error Tempco 6 ppm/°C
Gain Error (Note 1) GE ±1.0 LSB
Gain-Error Tempco 1 ppm/°C
Power-Supply Rejection Ratio PSRR 100 800 µV/V

REFERENCE INPUT

Reference Input Range V
Reference Input Resistance R

MULTIPLYING-MODE PERFORMANCE

Reference -3dB Bandwidth 650 kHz
Reference Feedthrough -84 dBInput code = all 0s, V

Signal-to-Noise Plus
Distortion Ratio

INL

REF
REF

SINAD 72 dB

MAX5250A
MAX5250B
Guaranteed monotonic

OS

4.5V ≤ VDD≤ 5.5V

Code dependent, minimum at code 554 hex

V

= 0.67Vp-p

REF

V

= 1Vp-p at 25kHz, code = full scale

REF

CONDITIONS

= 3.6Vp-p at 1kHz

REF

±0.25 ±0.5

±1.0

±6.0 mV

0V

10 kΩ

- 1.4 V

DD

LSB

2 _______________________________________________________________________________________

Low-Power, Quad, 10-Bit Voltage-Output DAC

with Serial Interface

ELECTRICAL CHARACTERISTICS (continued)

(VDD= +5V ±10%, AGND = DGND = 0V, REFAB = REFCD = 2.5V, RL= 5kΩ, CL= 100pF, TA= T
noted. Typical values are at T

PARAMETER SYMBOL MIN TYP MAX UNITS

DIGITAL INPUTS

Input High Voltage V
Input Low Voltage V
Input Leakage Current I
Input Capacitance C

DIGITAL OUTPUTS

Output High Voltage V
Output Low Voltage V

DYNAMIC PERFORMANCE

Voltage Output Slew Rate SR 0.6 V/µs
Output Settling Time 10 µs
Output Voltage Swing 0 to V
Current into FB_ 0 0.1 µA

OUT_ Leakage Current
in Shutdown

Start-Up Time Exiting
Shutdown Mode

Digital Feedthrough 5 nV-s
Digital Crosstalk 5 nV-s

POWER SUPPLIES

Supply Voltage V
Supply Current I
Supply Current in Shutdown 10 20 µA
Reference Current in Shutdown 0.01 ±1 µA

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

A

CONDITIONS

2.4 V

VDD- 0.5 V

4.5 5.5 V

IN

OH
OL

DD

DD

IH
IL

VIN= 0V or V

IN

I

SOURCE

I

= 2mA

SINK

To ±1/2LSB, V
Rail-to-rail (Note 2)

RL= ∞

CS = VDD, DIN = 100kHz

(Note 3)
(Note 3)

DD

= 2mA

STEP

= 2.5V

to T

MIN

0.01 ±1.0 µA

0.13 0.4 V

0.01 ±1 µA

0.85 0.98 mA

, unless otherwise

MAX

0.8 V

8 pF

DD

15 µs

MAX5250

V

Note 1: Guaranteed from code 3 to code 1023 in unity-gain configuration.
Note 2: Accuracy is better than 1LSB for V

end points.

Note 3: R

= ∞, digital inputs at DGND or VDD.

L

_______________________________________________________________________________________ 3

= 6mV to VDD- 60mV, guaranteed by a power-supply rejection test at the

OUT

Low-Power, Quad, 10-Bit Voltage-Output DAC
with Serial Interface

ELECTRICAL CHARACTERISTICS (continued)

(VDD= +5V ±10%, AGND = DGND = 0V, REFAB = REFCD = 2.5V, RL= 5kΩ, CL= 100pF, TA= T
noted. Typical values are at T

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

A

CONDITIONS

TIMING CHARACTERISTICS (Figure 6)

SCLK Clock Period
SCLK Pulse Width High

MAX5250

SCLK Pulse Width Low
CS Fall to SCLK Rise Setup Time
SCLK Raise to CS Rise Hold Time
DIN Setup Time
DIN Hold Time

SCLK Rise to DOUT Valid
Propagation Delay

SCLK Fall to DOUT Valid
Propagation Delay

SCLK Rise to CS Fall Delay

CS Rise to SCLK Rise Hold Time
CS Pulse Width High

CP
CH

CL
CSS
CSH

DS

DH

D01

D02

CS0
CS1

CSW

C

C

LOAD

LOAD

= 200pF

= 200pF

MIN

to T

, unless otherwise

MAX

UNITSMIN TYP MAXSYMBOLPARAMETER

ns100t
ns40t
ns40t
ns40t
ns0t
ns40t
ns0t

ns80t

ns80t
ns40t

ns40t
ns100t

__________________________________________Typical Operating Characteristics

(V

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

DD

INTEGRAL NONLINEARITY
vs. REFERENCE VOLTAGE

0.075

0.050

0.025
0

-0.025

INL (LSB)

-0.050

-0.075

-0.100
RL = 5kΩ

-0.125

0.4 1.2 2.0 2.8 3.6
REFERENCE VOLTAGE (V)

MAX5250-01

RELATIVE OUTPUT (dB)

4.4

-12

-16

-20

REFERENCE VOLTAGE INPUT

FREQUENCY RESPONSE

0

-4



-8

0 500k 1.0M 1.5M 2.0M 2.5M 3.0M



REFAB SWEPT 0.67Vp-p
RL = 5kΩ
CL = 100pF

FREQUENCY (Hz)

MAX5250-02

1000

950
900
850
800
750
700
650

SUPPLY CURRENT (µA)

600
550
500

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

4 _______________________________________________________________________________________

SUPPLY CURRENT

vs. TEMPERATURE

CODE = FFC hex

TEMPERATURE (°C)



MAX5250-03

Low-Power, Quad, 10-Bit Voltage-Output DAC

with Serial Interface

____________________________Typical Operating Characteristics (continued)

(V

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

DD



SUPPLY CURRENT

vs. SUPPLY VOLTAGE

1000

950
900
850
800
750

SUPPLY CURRENT (µA)

700
650

CODE = FFC hex

600

4.0 4.2 4.64.4 4.8 5.0 5.2 5.4 5.6
SUPPLY VOLTAGE (V)

0

-0.25

-0.50

TOTAL HARMONIC DISTORTION PLUS NOISE

0.50

0.45

MAX5250-04

0.40

0.35

0.30

0.25

0.20

THD + NOISE (%)

0.15

0.10

0.05
0

FULL-SCALE ERROR

vs. LOAD

vs. FREQUENCY

DAC CODE = FULL SCALE
REFAB = 1Vp-p

= 5kΩ

R

L

= 100pF

C

L

1

FREQUENCY (kHz)

MAX5250-09

0

MAX5250-05

10

100

-20

-40

-60

SIGNAL AMPLITUDE (dB)

-80

-100

0.5 1.6 3.8

REFERENCE FEEDTHROUGH

AT 1kHz

0

-20

-40

REFAB INPUT SIGNAL

V

= 3.6Vp-p @ 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)

MAX5250-11

MAX5250

MAX5250-10

-0.75

FULL-SCALE ERROR (LSB)

-1.00

-1.25

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

_______________________________________________________________________________________

5