Rainbow-electronics MAX5250 User Manual

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__________________General Description
The +5V MAX5250 combines four low-power, voltage-
output, 10-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
MAX5250 ideal for industrial-process-control applica-
tions. Other features include software shutdown, hard-
ware 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
be updated independently or simultaneously with a sin-
gle software command. All logic inputs are TTL/CMOS-
logic compatible.
________________________Applications
Digital Offset and Gain Adjustment
Microprocessor-Controlled Systems
Industrial Process Controls
Automatic Test Equipment
Remote Industrial Controls
Motion Control
______________________________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
MAX5250
Low-Power, Quad, 10-Bit Voltage-Output DAC
with Serial Interface
________________________________________________________________
Maxim Integrated Products
1
MAX5250
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
19-1171; Rev 0; 12/96
_________________Ordering Information
Ordering Information continued on last page.
Pin Configuration appears at end of data sheet.
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
SPI and QSPI are trademarks of Motorola, Inc. Microwire is a trademark of National Semiconductor Corp.
PART
MAX5250ACPP
MAX5250BCPP
MAX5250ACAP 0°C to +70°C
0°C to +70°C
0°C to +70°C
TEMP. RANGE PIN-PACKAGE
20 Plastic DIP
20 Plastic DIP
20 SSOP
INL
(LSB)
±1/2
±1
±1/2
MAX5250BCAP 0°C to +70°C 20 SSOP ±1
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Summary of Contents

Page 1 - Maxim Integrated Products

__________________General DescriptionThe +5V MAX5250 combines four low-power, voltage-output, 10-bit digital-to-analog converters (DACs) andfour preci

Page 2 - ELECTRICAL CHARACTERISTICS

MAX5250Figure 5 shows the serial-interface timing requirements.The chip-select pin (CS) must be low to enable theDAC’s serial interface. When CS is hi

Page 3

Power-Down (PDL)The power-down lockout pin PDL disables softwareshutdown when low. When in shutdown, transitioningPDL from high to low wakes up the pa

Page 4 - MAX5250-01

MAX5250Low-Power, Quad, 10-Bit Voltage-Output DACwith Serial Interface12 _____________________________________________________________________________

Page 5 - = +5V, T

__________Applications InformationUnipolar OutputFor a unipolar output, the output voltages and the refer-ence inputs have the same polarity. Figure 9

Page 6 - MAX5250-13

MAX5250Using an AC Reference In applications where the reference has AC signal com-ponents, the MAX5250 has multiplying capability withinthe reference

Page 7

Power-Supply Considerations On power-up, all input and DAC registers are cleared(set to zero code) and DOUT is in Mode 0 (serial datais shifted out of

Page 8 - Power-Down Mode

Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses arei

Page 9 - Serial-Interface Description

MAX5250Low-Power, Quad, 10-Bit Voltage-Output DACwith Serial Interface2 ______________________________________________________________________________

Page 10 - Serial-Data Output (DOUT)

MAX5250Low-Power, Quad, 10-Bit Voltage-Output DACwith Serial Interface________________________________________________________________________________

Page 11 - Daisy Chaining Devices

1000950900850800750700650600550500-55 -40 -20 0 20 40 60 80 100 120MAX5250-03SUPPLY CURRENT (µA)SUPPLY CURRENTvs. TEMPERATURETEMPERATURE (°C)CODE =

Page 12

MAX5250Low-Power, Quad, 10-Bit Voltage-Output DACwith Serial Interface________________________________________________________________________________

Page 13 - Bipolar Output

10µs/divMAJOR-CARRY TRANSITIONMAX5250-07OUTB,AC COUPLED100mV/divCS5V/div2µs/divOUTA,AC COUPLED10mV/divDIGITAL FEEDTHROUGH (SCLK = 100kHz)MAX5250-

Page 14 - Using an AC Reference

MAX5250Low-Power, Quad, 10-Bit Voltage-Output DACwith Serial Interface________________________________________________________________________________

Page 15 - Power-Supply Considerations

MAX5250Low-Power, Quad, 10-Bit Voltage-Output DACwith Serial Interface8 ______________________________________________________________________________

Page 16 - SMALL-OUTLINE

In power-down mode, the MAX5250 output amplifiersand the reference inputs enter a high-impedance state.The serial interface remains active. Data in th

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