Rainbow Electronics MAX5812 User Manual

General Description

The MAX5812 is a single, 12-bit voltage-output, digital-to­analog converter (DAC) with an I2C™-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 VDD= 3.6V. A low-power power­down mode decreases current consumption to less than
1µA. The MAX5812 features three software-selectable
power-down output impedances: 100kΩ, 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 100kΩ power-down mode.

The MAX5812 features a double-buffered I2C-compatible
serial interface that allows multiple devices to share a sin­gle 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 discon­necting 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-sav­ing 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 VDD= 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

100kΩ, 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

Pin Configuration

Ordering Information

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.

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.

PART TEMP RANGE

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

PIN­PACKAGE

TOP

MARK

V

DD

µC

SCL

SDA

R

R

P

P

R

S

SCL

R

S

SDA

R

S

SCL

R

S

SDA

MAX5812

MAX5812

V

OUT

V

OUT

DD

DD

V

DD

TOP VIEW

1

V

DD

2

GND

3

SDA

6

OUT

ADD

MAX5812

SOT23

5

SCL

4

MAX5812

12-Bit Low-Power, 2-Wire, Serial
Voltage-Output DAC

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VDD= +2.7V to +5.5V, GND = 0, RL= 5kΩ, CL= 200pF, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at

V

DD

= +5V, TA= +25°C.) (Note 1)

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.

VDD, SCL, SDA to GND............................................-0.3V to +6V

OUT, ADD to GND........................................-0.3V to V

DD

+ 0.3V

Maximum Current Into Any Pin ...........................................50mA

Continuous Power Dissipation (T

A

= +70°C)

6-Pin SOT23 (derate 9.1mW above +70°C).................727mW

Operating Temperature Range ...........................-40°C to +85°C

Maximum Junction Temperature .....................................+150°C

Storage Temperature Range .............................-65°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

STATIC ACCURACY (Note 2)

Resolution N 12 Bits

Integral Nonlinearity INL (Note 3) ±2 ±16 LSB

Differential Nonlinearity DNL Guaranteed monotonic (Note 3) ±1 LSB

Zero-Code Error ZCE

Zero-Code Error Tempco 2.3 ppm/oC

Gain Error GE Code = FFF hex -0.8 -3 %FS

Gain-Error Tempco 0.26 ppm/oC

DAC OUTPUT

Output Voltage Range No load (Note 4) 0 V

DC Output Impedance Code = 800 hex 1.2 Ω

Short-Circuit Current

Wake-Up Time

DAC Output Leakage Current

DIGITAL INPUTS (SCL, SDA)

Input High Voltage V

Input Low Voltage V

Input Hysteresis 0.05 ✕ V

Input Leakage Current Digital inputs = 0 or V

Input Capacitance 6pF

DIGITAL OUTPUT (SDA)

Output Logic Low Voltage V

Three-State Leakage Current I

Three-State Output Capacitance 6pF

DYNAMIC PERFORMANCE

Voltage-Output Slew Rate SR 0.5 V/µs

Voltage-Output Settling Time

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Code = 000 hex, V

IH

IL

OL

L

VDD = 5V, V

V

DD

VDD = 5V 8

V

DD

Power-down mode = high impedance,
V

DD

I

SINK

Digital inputs = 0 or V

To 1/2LSB code 400 hex to C00 hex or
C00 hex to 400 hex (Note 5)

OUT

= 3V, V

OUT

= 3V 8

= 5.5V, V

= 3mA 0.4 V

= 2.7V

DD

= full scale (short to GND) 42.2

= full scale (short to GND) 15.1

= VDD or GND

OUT

DD

DD

±6 ±40 mV

±0.1 ±1 µA

0.7 ✕ V

DD

0.3 ✕ V

DD

±0.1 ±1µA

±0.1 ±1µA

412µs

DD

DD

V

mA

µs

V

V

V

MAX5812

12-Bit Low-Power, 2-Wire, Serial

Voltage-Output DAC

_______________________________________________________________________________________ 3

Note 1: All devices are 100% production tested at TA= +25°C and are guaranteed by design for TA= T

MIN

to T

MAX

.

Note 2: Static specifications are tested with the output unloaded.
Note 3: Linearity is guaranteed from codes 115 to 3981.
Note 4: Offset and gain error limit the FSR.
Note 5: Guaranteed by design. Not production tested.

ELECTRICAL CHARACTERISTICS (continued)

(VDD= +2.7V to +5.5V, GND = 0, RL= 5kΩ, CL= 200pF, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at

V

DD

= +5V, TA= +25°C.) (Note 1)

Digital Feedthrough Code = 000 hex, digital inputs from 0 to V

Digital-to-Analog Glitch Impulse

POWER SUPPLIES

Supply Voltage Range V

Supply Current with No Load

Power-Down Supply Current All digital inputs at 0 or V

TIMING CHARACTERISTICS (Figure 1)

Serial Clock Frequency f

Bus Free Time Between STOP
and START Conditions

START Condition Hold Time t

SCL Pulse Width Low t

SCL Pulse Width High t

Repeated START Setup Time t

Data Hold Time t

Data Setup Time t

SDA and SCL Receiving
Rise Time

SDA and SCL Receiving
Fall Time

SDA Transmitting Fall Time t

STOP Condition Setup Time t

Bus Capacitance C

Maximum Duration of
Suppressed Pulse Widths

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Major carry transition, code = 7FF hex to 800
hex and 800 hex to 7FF hex

DD

All digital inputs at 0 or VDD = 3.6V 100 170

All digital inputs at 0 or V

SCL

t

BUF

HD, STA

LOW

HIGH

SU, STA

HD, DAT

SU, DAT

t

t

SU-STO

t

SP

(Note 5) 0 300 ns

r

(Note 5) 0 300 ns

f

(Note 5)

f

(Note 5) 400 pF

b

DD

DD

= 5.5V 130 190

= 5.5V 0.3 1 µA

DD

2.7 5.5 V

0 400 kHz

1.3 µs

0.6 µs

1.3 µs

0.6 µs

0.6 µs

00.9µs

100 ns

20 +

0.1C

0.6 µs

050ns

0.2 nV-s

12 nV-s

b

µA

250 ns

MAX5812

12-Bit Low-Power, 2-Wire, Serial
Voltage-Output DAC

4 _______________________________________________________________________________________

Typical Operating Characteristics

(VDD= +5V, RL= 5kΩ, TA= +25°C.)

INTEGRAL NONLINEARITY

vs. INPUT CODE

4

3

2

1

0

-1

-2

INTEGRAL NONLINEARITY (LSB)

-3

-4
0 1024 2048 3072 4096

INPUT CODE

5

MAX5812 toc01

4

3

2

INTEGRAL NONLINEARITY (LSB)

1

0

INTEGRAL NONLINEARITY

vs. SUPPLY VOLTAGE

2.7 4.13.4 4.8 5.5
SUPPLY VOLTAGE (V)

5

MAX5812 toc02

4

3

2

INTEGRAL NONLINEARITY (LSB)

1

0

-40 10-15 35 60 85

INTEGRAL NONLINEARITY

vs. TEMPERATURE

MAX5812 toc03

TEMPERATURE (°C)

DIFFERENTIAL NONLINEARITY

vs. INPUT CODE

1.00

0.75

0.50

0.25

0

-0.25

-0.50

DIFFERENTIAL NONLINEARITY (LSB)

-0.75

-1.00
0 1024 2048 3072 4096

INPUT CODE

ZERO-CODE ERROR

vs. SUPPLY VOLTAGE

10

8

6

4

ZERO-CODE ERROR (mV)

2

0

2.7 4.13.4 4.8 5.5
SUPPLY VOLTAGE (V)

NO LOAD

DIFFERENTIAL NONLINEARITY

0

MAX5812 toc04

-0.25

-0.50

-0.75

DIFFERENTIAL NONLINEARITY (LSB)

-1.00

2.7 4.13.4 4.8 5.5

10

MAX8512 toc07

8

6

4

ZERO-CODE ERROR (mV)

2

0

-40 10-15 35 60 85

vs. SUPPLY VOLTAGE

SUPPLY VOLTAGE (V)

ZERO-CODE ERROR

vs. TEMPERATURE

NO LOAD

TEMPERATURE (°C)

DIFFERENTIAL NONLINEARITY

0

MAX5812 toc05

-0.25

-0.50

-0.75

DIFFERENTIAL NONLINEARITY (LSB)

-1.00

-40 10-15 35 60 85

-2.0

MAX5812 toc08

-1.6

-1.2

-0.8

GAIN ERROR (%FSR)

-0.4

0

2.7 4.13.4 4.8 5.5

vs. TEMPERATURE

MAX5812 toc06

TEMPERATURE (°C)

GAIN ERROR

vs. SUPPLY VOLTAGE

MAX5812 toc09

NO LOAD

SUPPLY VOLTAGE (V)