MAX525BC/D Maxim Integrated, MAX525BC/D Datasheet

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MAX525BC/D

Manufacturer Part Number
MAX525BC/D
Description
Digital to Analog Converters - DAC
Manufacturer
Maxim Integrated
Datasheet

Specifications of MAX525BC/D

Number Of Converters
4
Resolution
12 bit
Interface Type
QSPI, SPI, Serial (3-Wire, Microwire)
Maximum Operating Temperature
+ 70 C
Mounting Style
SMD/SMT
Package / Case
Die
Minimum Operating Temperature
0 C
Supply Voltage - Max
5.5 V
Supply Voltage - Min
4.5 V
The MAX525 combines four low-power, voltage-output,
12-bit digital-to-analog converters (DACs) and four pre-
cision output amplifiers in a space-saving, 20-pin pack-
age. 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 applica-
tions. Other features include software shutdown, hard-
ware 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 sin-
gle software command. The DAC registers can be
simultaneously updated through the 3-wire serial inter-
face. All logic inputs are TTL/CMOS-logic compatible.
__________________General Description
________________________Applications
19-1098; Rev 2; 10/02
SPI and QSPI are trademarks of Motorola, Inc. MICROWIRE is a trademark of National Semiconductor Corp.
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.
_________________________________________________________________________Functional Diagram
Low-Power, Quad, 12-Bit Voltage-Output DAC
Industrial Process Controls
Automatic Test Equipment
Digital Offset and Gain Adjustment
Motion Control
Remote Industrial Controls
Microprocessor-Controlled Systems
________________________________________________________________ Maxim Integrated Products
DOUT
CS DIN SCLK
REGISTER
CONTROL
16-BIT
SHIFT
SR
CL
OUTPUT
CONTROL
DECODE
LOGIC
UPO
PDL
DGND
REGISTER A
REGISTER B
REGISTER C
REGISTER D
INPUT
INPUT
INPUT
INPUT
AGND
V
DD
REGISTER B
REGISTER C
REGISTER D
REGISTER A
DAC
DAC
DAC
DAC
______________________________Features
o Four 12-Bit DACs with Configurable
o +5V Single-Supply Operation
o Low Supply Current: 0.85mA Normal Operation
o Available in 20-Pin SSOP
o Power-On Reset Clears all Registers and
o Capable of Recalling Last State Prior to Shutdown
o SPI/QSPI and MICROWIRE Compatible
o Simultaneous or Independent Control of DACs
o User-Programmable Digital Output
Ordering Information continued at end of data sheet.
Pin Configuration appears at end of data sheet.
_________________Ordering Information
MAX525ACPP
MAX525BCPP
MAX525ACAP
MAX525BCAP
MAX525
Output Amplifiers
DACs to Zero
through 3-Wire Serial Interface
PART
with Serial Interface
DAC A
DAC C
DAC B
DAC D
REFAB
REFCD
TEMP RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
10µA Shutdown Mode
20 Plastic DIP
20 Plastic DIP
20 SSOP
20 SSOP
PIN-PACKAGE
FBA
FBB
OUTB
FBC
FBD
OUTD
OUTC
OUTA
(LSB)
±1/2
±1
±1/2
±1
INL
1

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MAX525BC/D Summary of contents

Page 1

... OUTPUT CS DIN SCLK UPO SPI and QSPI are trademarks of Motorola, Inc. MICROWIRE is a trademark of National Semiconductor Corp. ________________________________________________________________ Maxim Integrated Products 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. with Serial Interface ...

Page 2

Low-Power, Quad, 12-Bit Voltage-Output DAC with Serial Interface ABSOLUTE MAXIMUM RATINGS V to AGND............................................................-0. DGND ...........................................................-0.3V to +6V DD AGND to DGND ..................................................................±0.3V REFAB, REFCD to AGND ...........................-0. OUT_, FB_ to AGND...................................-0.3V to ...

Page 3

Low-Power, Quad, 12-Bit Voltage-Output DAC ELECTRICAL CHARACTERISTICS (continued +5V ±10%, AGND = DGND = 0V, REFAB = REFCD = 2.5V noted. Typical values are +25°C. Output buffer connected in unity-gain configuration (Figure 9).) ...

Page 4

Low-Power, Quad, 12-Bit Voltage-Output DAC with Serial Interface ELECTRICAL CHARACTERISTICS (continued +5V ±10%, AGND = DGND = 0V, REFAB = REFCD = 2.5V noted. Typical values are +25°C. Output buffer connected in unity-gain ...

Page 5

Low-Power, Quad, 12-Bit Voltage-Output DAC ____________________________Typical Operating Characteristics (continued +5V +25°C, unless otherwise noted SUPPLY CURRENT vs. SUPPLY VOLTAGE 1000 950 900 850 800 750 700 650 CODE = FFF HEX 600 4.0 4.2 ...

Page 6

Low-Power, Quad, 12-Bit Voltage-Output DAC with Serial Interface ____________________________Typical Operating Characteristics (continued +5V +25°C, unless otherwise noted MAJOR-CARRY TRANSITION 10 s/div V = 2.5V 100pF REF L L ...

Page 7

Low-Power, Quad, 12-Bit Voltage-Output DAC ______________________________________________________________Pin Description PIN NAME 1 AGND Analog Ground 2 FBA DAC A Output Amplifier Feedback 3 OUTA DAC A Output Voltage 4 OUTB DAC B Output Voltage 5 FBB DAC B Output Amplifier Feedback 6 ...

Page 8

Low-Power, Quad, 12-Bit Voltage-Output DAC with Serial Interface D10 REF_ AGND SHOWN FOR ALL 1s ON DAC Figure 1. Simplified DAC Circuit Diagram _______________Detailed Description The MAX525 contains four 12-bit, voltage-output ...

Page 9

Low-Power, Quad, 12-Bit Voltage-Output DAC In power-down mode, the MAX525 output amplifiers and the reference inputs enter a high-impedance state. The serial interface remains active. Data in the input registers is retained in power-down, allowing the MAX525 to recall the ...

Page 10

Low-Power, Quad, 12-Bit Voltage-Output DAC with Serial Interface Table 1. Serial-Interface Programming Commands C1 16-BIT SERIAL WORD C0 D11................. MSB 12-bit DAC data 12-bit DAC data 1 0 ...

Page 11

Low-Power, Quad, 12-Bit Voltage-Output DAC CS SCLK 1 DIN DOUT (MODE 0) MSB FROM PREVIOUS WRITE DOUT (MODE 1) MSB FROM PREVIOUS WRITE Figure 5. Serial-Interface Timing Diagram CS t CSS ...

Page 12

Low-Power, Quad, 12-Bit Voltage-Output DAC with Serial Interface MAX525 SCLK SCLK DIN DOUT DIN CS CS Figure 7. Daisy-Chaining MAX525s DIN SCLK CS1 CS2 CS3 CS MAX525 SCLK DIN Figure 8. Multiple MAX525s Sharing a Common DIN Line 12 ______________________________________________________________________________________ ...

Page 13

Low-Power, Quad, 12-Bit Voltage-Output DAC __________Applications Information For a unipolar output, the output voltages and the refer- ence inputs have the same polarity. Figure 9 shows the MAX525 unipolar output circuit, which is also the typi- cal operating circuit. Table ...

Page 14

Low-Power, Quad, 12-Bit Voltage-Output DAC with Serial Interface +5V REFERENCE INPUTS MAX525 V REFAB REFCD DD DAC A DAC B DAC C DAC D AGND DGND 2.5V REFAB REFCD Figure 10. Unipolar Rail-to-Rail Output Circuit R1 ...

Page 15

Low-Power, Quad, 12-Bit Voltage-Output DAC REF_ MAX525 DAC_ Figure 13. Digitally Programmable Current Source Power-Supply Considerations On power-up, all input and DAC registers are cleared (set to zero code) and DOUT is in Mode 0 (serial data is shifted out ...

Page 16

... Low-Power, Quad, 12-Bit Voltage-Output DAC with Serial Interface _Ordering Information (continued) PART TEMP RANGE PIN-PACKAGE MAX525BC/D 0°C to +70°C Dice* MAX525AEPP -40°C to +85°C 20 Plastic DIP MAX525BEPP -40°C to +85°C 20 Plastic DIP MAX525AEAP -40°C to +85°C 20 SSOP MAX525BEAP -40°C to +85°C ...

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