max5302cuat Maxim Integrated Products, Inc., max5302cuat Datasheet

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max5302cuat

Manufacturer Part Number
max5302cuat
Description
Max5302 Low-power, 12-bit Voltage-output Dac With Serial Interface
Manufacturer
Maxim Integrated Products, Inc.
Datasheet
The MAX5302 combines a low-power, voltage-output,
12-bit digital-to-analog converter (DAC) and a precision
output amplifier in an 8-pin µMAX package. It operates
from a single +5V supply, drawing less than 280µA of
supply current.
The output amplifier’s inverting input is available to the
user, allowing specific gain configurations, remote sens-
ing, and high output current capability. This makes the
MAX5302 ideal for a wide range of applications, includ-
ing industrial process control. Other features include a
software shutdown and power-on reset.
The serial interface is SPI™/QSPI™/MICROWIRE™ com-
patible. The DAC has a double-buffered input, organized
as an input register followed by a DAC register. A 16-bit
serial word loads data into the input register. The DAC
register can be updated independently or simultaneously
with the input register. All logic inputs are TTL/CMOS-
logic compatible and buffered with Schmitt triggers to
allow direct interfacing to optocouplers.
__________________General Description
19-1559; Rev 0; 10/99
SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
SCLK
DIN
CS
Industrial Process Control
Automatic Test Equipment
Digital Offset and Gain Adjustment
Motion Control
Remote Industrial Control
Microprocessor-Controlled Systems
CONTROL
GND
REGISTER
16-BIT
SHIFT
________________________________________________________________ Maxim Integrated Products
REGISTER
REGISTER
Low-Power, 12-Bit Voltage-Output DAC
INPUT
DAC
V
DD
Functional Diagram
REF
DAC
Applications
MAX5302
OUT
FB
o 12-Bit DAC with Configurable Output Amplifier
o +5V Single-Supply Operation
o Low Supply Current: 0.28mA Normal Operation
o Available in 8-Pin µMAX
o Power-On Reset Clears DAC Output to Zero
o SPI/QSPI/MICROWIRE Compatible
o Schmitt-Trigger Digital Inputs for Direct
MAX5302CUA
MAX5302EUA
Optocoupler Interface
TOP VIEW
PART
with Serial Interface
SCLK
OUT
DIN
CS
-40°C to +85°C
TEMP. RANGE
0°C to +70°C
1
2
3
4
Ordering Information
MAX5302
µMAX
2µA Shutdown Mode
Pin Configuration
8
7
6
5
PIN-PACKAGE
8 µMAX
8 µMAX
V
GND
REF
FB
DD
Features
1

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max5302cuat Summary of contents

Page 1

Rev 0; 10/99 Low-Power, 12-Bit Voltage-Output DAC __________________General Description The MAX5302 combines a low-power, voltage-output, 12-bit digital-to-analog converter (DAC) and a precision output amplifier in an 8-pin µMAX package. It operates from a single +5V supply, drawing less than ...

Page 2

Low-Power, 12-Bit Voltage-Output DAC with Serial Interface ABSOLUTE MAXIMUM RATINGS V to GND ..............................................................-0.3V to +6V DD REF, OUT GND ................................-0. Digital Inputs to GND ...............................................-0.3V to +6V Continuous Current into Any Pin.......................................±20mA Continuous Power Dissipation ...

Page 3

Low-Power, 12-Bit Voltage-Output DAC ELECTRICAL CHARACTERISTICS (continued) (Circuit of Figure +5V ±10 ues are +25°C. Output buffer connected in unity-gain configuration.) A PARAMETER SYMBOL DIGITAL INPUTS DYNAMIC PERFORMANCE Voltage Output Slew Rate ...

Page 4

Low-Power, 12-Bit Voltage-Output DAC with Serial Interface __________________________________________Typical Operating Characteristics (V = +5V 5kΩ 100pF +25°C, unless otherwise noted INTEGRAL NONLINEARITY vs. REFERENCE VOLTAGE 0.3 0.2 0.1 0 -0.1 -0.2 ...

Page 5

Low-Power, 12-Bit Voltage-Output DAC (V = +5V 5kΩ 100pF MAJOR-CARRY TRANSITION CS 5V/div OUT AC-COUPLED 100mV/div 10µs/div _______________________________________________________________________________________ with Serial Interface Typical Operating Characteristics (continued) = +25°C, unless otherwise noted.) SCLK ...

Page 6

Low-Power, 12-Bit Voltage-Output DAC with Serial Interface _____________________Pin Description PIN NAME FUNCTION 1 OUT DAC Output Voltage CS 2 Chip-Select Input. Active low. 3 DIN Serial-Data Input 4 SCLK Serial-Clock Input 5 FB DAC Output Amplifier Feedback 6 REF Reference ...

Page 7

Low-Power, 12-Bit Voltage-Output DAC SCLK MAX5302 DIN CS Figure 2. Connections for MICROWIRE DIN MAX5302 SCLK CS CPOL = 0, CPHA = 0 Figure 3. Connections for SPI/QSPI Table 1. Serial-Interface Programming Commands 16-BIT SERIAL WORD D11............... ...

Page 8

Low-Power, 12-Bit Voltage-Output DAC with Serial Interface CS SCLK 1 DIN D11 D10 Figure 5. Serial-Interface Timing Diagram CS t CSS t CSO SCLK DIN Figure 6. Detailed Serial-Interface Timing Diagram DIN SCLK ...

Page 9

Low-Power, 12-Bit Voltage-Output DAC bits (C2, C1, C0), followed by the 12+1 data bits D11...D0, S0 (Figure 4). Set the sub-bit (S0) to zero. The 3-bit control code determines the register to be updated and the configuration when exiting shutdown. ...

Page 10

Low-Power, 12-Bit Voltage-Output DAC with Serial Interface +5V REF V DD MAX5302 DAC GND Figure 9. Unipolar Rail-to-Rail Output Circuit Digitally Programmable Current Source The circuit of Figure 12 places an NPN transistor (2N3904 or similar) within the op amp ...

Page 11

Low-Power, 12-Bit Voltage-Output DAC +5V +5V MAX495 26k AC REFERENCE INPUT 10k 500mVp-p REF DAC Figure 11. AC Reference Input Circuit Chip Information TRANSISTOR COUNT: 3053 SUBSTRATE CONNECTED TO AGND ______________________________________________________________________________________ with Serial Interface V DD OUT MAX5302 GND Figure ...

Page 12

Low-Power, 12-Bit Voltage-Output DAC with Serial Interface Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and ...

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