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MAX5251B Datasheet

Download or read online Maxim Integrated MAX5251B 3V, Quad, 10-Bit, Voltage-Output DAC with Serial Interface pdf datasheet.



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19-1172; Rev 1; 10/02
+3V, Quad, 10-Bit Voltage-Output DAC
__________________General Description
The +3V MAX5251 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
MAX5251 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 regis-
ters to be updated independently or simultaneously with
a single 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
_________________________________________________________________________Functional Diagram
DOUT
CL
DECODE
CONTROL
16-BIT
SHIFT
REGISTER
SR
LOGIC
CONTROL
OUTPUT
CS DIN SCLK
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
______________________________Features
o Four 10-Bit DACs with Configurable
Output Amplifiers
o +3.0V to +3.6V Single-Supply Operation
o Low Supply Current: 0.8mA Normal Operation
o Available in 20-Pin SSOP
o Power-On Reset Clears all Registers and
DACs to Zero
o SPI/QSPI and MICROWIRE Compatible
o Simultaneous or Independent Control of DACs
Through 3-Wire Serial Interface
o User-Programmable Digital Output
o Schmitt-Trigger Digital Inputs for Direct
Optocoupler Interface
o 12-Bit Upgrade Available: MAX5253
_________________Ordering Information
PART
MAX5251ACPP
MAX5251BCPP
MAX5251ACAP
MAX5251BCAP
Ordering Information continued on last page.
Pin Configuration appears at end of data sheet.
V
PDL
DGND
AGND
DD
MAX5251
INPUT
DAC
REGISTER A
REGISTER A
INPUT
DAC
REGISTER B
REGISTER B
INPUT
DAC
REGISTER C
REGISTER C
INPUT
DAC
REGISTER D
REGISTER D
UPO
3µA Shutdown Mode
TEMP RANGE
PIN-PACKAGE
0°C to +70°C
20 Plastic DIP
0°C to +70°C
20 Plastic DIP
0°C to +70°C
20 SSOP
0°C to +70°C
20 SSOP
REFAB
FBA
OUTA
DAC A
FBB
OUTB
DAC B
FBC
OUTC
DAC C
FBD
OUTD
DAC D
REFCD
INL
(LSB)
±1/2
±1
±1/2
±1
1

Summary of Contents

Page 1

... Through 3-Wire Serial Interface o User-Programmable Digital Output o Schmitt-Trigger Digital Inputs for Direct Optocoupler Interface o 12-Bit Upgrade Available: MAX5253 ___Ordering Information PART MAX5251ACPP MAX5251BCPP MAX5251ACAP MAX5251BCAP Ordering Information continued on last page. Pin Configuration appears at end of data sheet. V PDL DGND AGND DD MAX5251 INPUT ...

Page 2

... Reference Input Range V REF Reference Input Resistance R REF 2 ___ Operating Temperature Ranges MAX5251_C_P ...0°C to 70°C MAX5251_E_P ...-40°C to 85°C 0.3V) MAX5251BMJP ...-55°C to 125° 0.3V) Storage Temperature Range ...-65°C to 150°C DD Lead Temperature (soldering, 10s) ...300°C 0.3V 5kΩ 100pF CONDITIONS ...

Page 3

Quad, 10-Bit Voltage-Output DAC ELECTRICAL CHARACTERISTICS (continued 3.0V to 3.6V, AGND DGND 0V, REFAB REFCD 1.25V noted. Typical values are 25°C. Output buffer connected in unity-gain configuration (Figure ...

Page 4

Quad, 10-Bit Voltage-Output DAC with Serial Interface ELECTRICAL CHARACTERISTICS (continued 3.0V to 3.6V, AGND DGND 0V, REFAB REFCD 1.25V noted. Typical values are 25°C. Output buffer connected in ...

Page 5

Quad, 10-Bit Voltage-Output DAC ___Typical Operating Characteristics (continued 3.3V 25°C, unless otherwise noted SUPPLY CURRENT vs. SUPPLY VOLTAGE 1000 950 900 850 800 750 700 650 600 550 CODE FFC HEX 500 ...

Page 6

Quad, 10-Bit Voltage-Output DAC with Serial Interface ___Typical Operating Characteristics (continued 3.3V 1.25V 5kΩ, C REF L DD MAJOR-CARRY TRANSITION 10µs/div ANALOG CROSSTALK GND 10µs/div DAC A CODE SWITCHING FROM 00C HEX TO ...

Page 7

Quad, 10-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

Quad, 10-Bit Voltage-Output DAC with Serial Interface REF_ AGND SHOWN FOR ALL 1s ON DAC Figure 1. Simplified DAC Circuit Diagram ___Detailed Description The MAX5251 contains four voltage-output digital-to- ...

Page 9

Quad, 10-Bit Voltage-Output DAC In shutdown mode, the MAX5251 output amplifiers and the reference inputs enter a high-impedance state. The serial interface remains active. Data in the input regis- ters is retained in shutdown, allowing the MAX5251 to recall ...

Page 10

Quad, 10-Bit Voltage-Output DAC with Serial Interface Table 1. Serial-Interface Programming Commands 16-BIT SERIAL WORD D9... MSB...LSB 10-bit DAC data 10-bit DAC data ...

Page 11

Quad, 10-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

Quad, 10-Bit Voltage-Output DAC with Serial Interface MAX5251 SCLK SCLK DIN DOUT DIN CS CS Figure 7. Daisy-Chaining MAX5251s DIN SCLK CS1 CS2 CS3 CS MAX5251 SCLK DIN Figure 8. Multiple MAX5251s Sharing a Common DIN Line 12 ___ ...

Page 13

Quad, 10-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 MAX5251 unipolar output circuit, which is also the typi- cal operating circuit. Table ...

Page 14

Quad, 10-Bit Voltage-Output DAC with Serial Interface 3.3V REFERENCE INPUTS MAX5251 REFAB V REFCD DD DAC A DAC B DAC C DAC D AGND DGND 1.25V REFAB REFCD 16kΩ 2.6 ...

Page 15

Quad, 10-Bit Voltage-Output DAC REF_ MAX5251 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

... SSOP MAX5251BEAP -40°C to 85°C 20 SSOP MAX5251BMJP -55°C to 125°C 20 CERDIP Contact factory for availability and processing to MIL-STD-883. (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.) ...

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