Rainbow Electronics MAX5223 - Manual

General Description
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
DD . The
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
Digital Gain and Offset Adjustment
Programmable Current Source
Programmable Voltage Source
Power Amp Bias Control
VCO Tuning
Features
♦ Tiny 8-Pin SOT23 Package (3mm ✕ 3mm)
♦ Low Power Consumption
100µA Operating Current
<1µA Shutdown Current
♦ +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
MAX5223
Low-Power, Dual, 8-Bit, Voltage Output
Serial DAC in 8-Pin SOT23
________________________________________________________________ Maxim Integrated Products 1
DAC
LATCH
A
DAC A
DAC
LATCH
B
DAC B
SCLK
OUTA
OUTB
DIN REF V DD
16-BIT SHIFT REGISTER
CONTROL (8)
DATA (8)
MAX5223
8 3
1
5
6
7
4
0.1 µ F
(OPTIONAL)
V OUTA
V OUTB
GND 2
0.22 µ F
CS
Functional Diagram
OUTB V DD
OUTA SCLK
1
2
8
7
DIN
REF GND
CS
MAX5223
TOP VIEW
3
4
6
5
SOT23-8
Pin Configuration
19-1895; Rev 0; 1/01
PART TEMP. RANGE PIN-PACKAGE
MAX5223EKA-T -40°C to +85°C 8 SOT23
SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
Ordering Information
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.