Rainbow Electronics MAX5812 - Manual

General Description
The MAX5812 is a single, 12-bit voltage-output, digital-to-
analog converter (DAC) with an I
2 C™-compatible 2-wire
interface that operates at clock rates up to 400kHz. The
device operates from a single 2.7V to 5.5V supply and
draws only 100µA at V
DD = 3.6V. A low-power power-
down mode decreases current consumption to less than
1µA. The MAX5812 features three software-selectable
power-down output impedances: 100k
Ω, 1kΩ, and high
impedance. Other features include an internal precision
Rail-to-Rail
® output buffer and a power-on reset circuit
that powers up the DAC in the 100k Ω power-down mode.
The MAX5812 features a double-buffered I 2 C-compatible
serial interface that allows multiple devices to share a sin-
gle bus. All logic inputs are CMOS-logic compatible and
buffered with Schmitt triggers, allowing direct interfacing
to optocoupled and transformer-isolated interfaces. The
MAX5812 minimizes digital noise feedthrough by discon-
necting the clock (SCL) signal from the rest of the device
when an address mismatch is detected.
The MAX5812 is specified over the extended temperature
range of -40°C to +85°C and is available in a space-sav-
ing 6-pin SOT23 package. Refer to the MAX5811 for the
10-bit version.
Applications
Digital Gain and Offset Adjustments
Programmable Voltage and Current Sources
Programmable Attenuation
VCO/Varactor Diode Control
Low-Cost Instrumentation
Battery-Operated Equipment
Features
♦ Ultra-Low Supply Current
100µA at V DD = 3.6V
130µA at V DD = 5.5V
♦ 300nA Low-Power Power-Down Mode
♦ Single 2.7V to 5.5V Supply Voltage
♦ Fast 400kHz I
2 C-Compatible 2-Wire Serial
Interface
♦ Schmitt-Trigger Inputs for Direct Interfacing to
Optocouplers
♦ Rail-to-Rail Output Buffer Amplifier
♦ Three Software-Selectable Power-Down Output
Impedances
100k
Ω, 1kΩ, and High Impedance
♦ Read-Back Mode for Bus and Data Checking
♦ Power-On Reset to Zero
♦ Miniature 6-Pin SOT23 Package
MAX5812
12-Bit Low-Power, 2-Wire, Serial
Voltage-Output DAC
________________________________________________________________ Maxim Integrated Products 1
SCL SDA
1
2
6
5
V
DD
ADD GND
OUT
MAX5812
SOT23
TOP VIEW
3 4
Pin Configuration
Ordering Information
R S
R S
R S
R S
R P R P
V DD
µC
SDA SCL
SDA
SDA
SCL
SCL
V DD
V DD
V DD
OUT
OUT
MAX5812
MAX5812
Typical Operating Circuit
19-2340; Rev 0; 1/02
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.
PART TEMP RANGE
PIN-
PACKAGE TOP
MARK
MAX5812LEUT -40°C to +85°C 6 SOT23 AAYT
MAX5812MEUT -40°C to +85°C 6 SOT23 AAYV
MAX5812NEUT -40°C to +85°C 6 SOT23 AAYX
MAX5812PEUT -40°C to +85°C 6 SOT23 AAYZ
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
I 2 C is a trademark of Philips Corporation.
Selector Guide appears at end of data sheet.
Functional Diagram appears at end of data sheet.