max5223 Maxim Integrated Products, Inc., max5223 Datasheet

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max5223

Manufacturer Part Number
max5223
Description
Max5223 Low-power, Dual, 8-bit, Voltage-output Serial Dac In 8-pin Sot23
Manufacturer
Maxim Integrated Products, Inc.
Datasheet

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max5223EKA+T
Manufacturer:
MAXIM
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max5223EKA+T
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The MAX5223 contains two 8-bit, buffered, voltage out-
put digital-to-analog converters (DAC A and DAC B) in a
small 8-pin SOT23 package. DAC outputs can source
and sink 1mA to within 100mV of ground and V
MAX5223 operates with a single +2.7V to +5.5V supply.
The device uses a 3-wire serial interface, which oper-
ates at clock rates up to 25MHz and is compatible with
SPI™, QSPI™, and MICROWIRE™ interface standards.
The serial input shift register is 16 bits long and con-
sists of 8 bits of DAC input data and 8 bits for DAC
selection and shutdown control. DAC registers can be
loaded independently or in parallel at the positive edge
of CS.
The MAX5223’s ultra-low power consumption and tiny
8-pin SOT23 package make it ideal for portable and
battery-powered applications. Supply current is a low
100µA and drops below 1µA in shutdown mode. In
addition, the reference input is disconnected from the
REF pin during shutdown, which reduces the system’s
total power consumption.
________________________Applications
19-1895; Rev 0; 1/01
SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
TOP VIEW
Digital Gain and Offset Adjustment
Programmable Current Source
Programmable Voltage Source
Power Amp Bias Control
VCO Tuning
SCLK
GND
V
CS
DD
________________________________________________________________ Maxim Integrated Products
1
2
3
4
Low-Power, Dual, 8-Bit, Voltage Output
General Description
SOT23-8
MAX5223
Pin Configuration
8
7
6
5
DIN
REF
OUTB
OUTA
DD
. The
Serial DAC in 8-Pin SOT23
MAX5223EKA-T
SCLK
Tiny 8-Pin SOT23 Package (3mm
Low Power Consumption
+2.7V to +5.5V Single-Supply Operation
Dual Buffered Voltage Output
Programmable Shutdown Mode
25MHz, 3-Wire Serial Interface
SPI, QSPI, and MICROWIRE-Compatible
CS
4
1
100µA Operating Current
<1µA Shutdown Current
PART
8
DIN
0.22 F
LATCH
LATCH
DAC
DAC
TEMP. RANGE
-40°C to +85°C
A
B
3
Ordering Information
2
V
Functional Diagram
DD
GND
7
DAC A
DAC B
REF
MAX5223
0.1 F
(OPTIONAL)
8 SOT23
PIN-PACKAGE
3mm)
Features
OUTA
OUTB
5
6
V
V
OUTA
OUTB
1

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max5223 Summary of contents

Page 1

... A and DAC small 8-pin SOT23 package. DAC outputs can source and sink 1mA to within 100mV of ground and V MAX5223 operates with a single +2.7V to +5.5V supply. The device uses a 3-wire serial interface, which oper- ates at clock rates up to 25MHz and is compatible with SPI™ ...

Page 2

Low-Power, Dual, 8-Bit, Voltage Output Serial DAC in 8-Pin SOT23 ABSOLUTE MAXIMUM RATINGS V to GND ............................................................. -0.3V to +6V DD All Other Pins to GND (Note 1).................. -0. Continuous Power Dissipation (T = +70°C) A 8-Pin SOT23 ...

Page 3

Low-Power, Dual, 8-Bit, Voltage Output ELECTRICAL CHARACTERISTICS (continued +2.7V to +5.5V, REF = PARAMETER SYMBOL DYNAMIC PERFORMANCE Voltage Output Slew Rate Voltage Output Settling Time Digital Feedthrough and Crosstalk POWER SUPPLY Supply ...

Page 4

Low-Power, Dual, 8-Bit, Voltage Output Serial DAC in 8-Pin SOT23 __________________________________________Typical Operating Characteristics (V = +3V +25°C, unless otherwise noted OUTPUT VOLTAGE vs. OUTPUT SOURCE CURRENT 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 0.001 0.01 ...

Page 5

... 10k L ALL DATA BITS OFF TO ALL DATA BITS ON CLOCK FEEDTHROUGH MAX5223 toc11 SCLK, 5MHz 5V/div OUT_ 10mV/div AC-COUPLED 50ns/div POWER-UP OUTPUT GLITCH MAX5223 toc13 V DD 2V/div OUT_ 20mV/div 2ms/div = POSITIVE SETTLING TIME MAX5223 toc15 CS 2V/div OUT_ 1V/div 4 s/div ...

Page 6

... Reference Input for DAC A and DAC B (Optional: Bypass with 0.1µF to GND) 8 DIN Serial Data Input of the 16-Bit Shift Register. Data is clocked into the register on the rising edge of SCLK. 6 _______________________________________________________________________________________ Typical Operating Characteristics (continued) OUTPUT VOLTAGE NOISE (DC TO 1MHz) MAX5223 toc16 CH1 OUTA 2mV/div AC-COUPLED V = +3V, REF = LOAD, ...

Page 7

... DAC register remains unchanged. This removes the load from the reference input to save power. Bringing the MAX5223 out of shut- down mode restores the DAC output voltage. Since the input resistance at REF is code-dependent, the DAC’s ...

Page 8

Low-Power, Dual, 8-Bit, Voltage Output Serial DAC in 8-Pin SOT23 in starting with UB1 (uncommitted bit), followed by the remaining control bits and the data byte. The least sig- nificant bit (LSB) of the data byte (D0) is the last ...

Page 9

... V and 0 Microprocessor Interfacing The MAX5223 serial interface is compatible with MICROWIRE, SPI, and QSPI. For SPI, clear the CPOL and CPHA bits (CPOL = 0 and CPHA = 0). CPOL = 0 sets the inactive clock state to zero, and CPHA = 0 _______________________________________________________________________________________ Serial DAC in 8-Pin SOT23 DATA D7 LA ...

Page 10

... DIN Figure 3. Detailed Serial-Interface Timing Diagram Applications Information The MAX5223 is specified for single-supply operation with V ranging from +2.7V to +5.5V, covering all DD commonly used supply voltages in +3V and +5V sys- tems. An internal POR circuit forces the outputs to zero scale and initializes all internal registers to zero. Perform an initial write operation to set the outputs to the desired voltage at power-up ...

Page 11

Low-Power, Dual, 8-Bit, Voltage Output ________________________________________________________Package Information 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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