MAXIM MAX5820 Technical data

General Description

The MAX5820 is a dual, 8-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
(115µA at VDD= 3.6V). A power-down mode decreases
current consumption to less than 1µA. The MAX5820 fea­tures three software-selectable power-down output
impedances: 100kΩ, 1kΩ, and high impedance. Other
features include internal precision rail-to-rail output
buffers and a power-on reset (POR) circuit that powers up
the DAC in the 100kΩ power-down mode.

The MAX5820 features a double-buffered I

2

C-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
MAX5820 minimizes digital noise feedthrough by discon­necting the clock (SCL) signal from the rest of the device
when an address mismatch is detected.

The MAX5820 is specified over the extended (-40°C to
+85°C) temperature range and is available in a small
8-pin µMAX®package. Refer to the MAX5822 data
sheet for the 12-bit version and to the MAX5821 data
sheet for a 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 Instrumentation

Features

♦ Ultra-Low Supply Current

115µA at V

DD

= 3.6V

135µA at V

DD

= 5.5V

♦ 300nA Low-Power Power-Down Mode

♦ Single 2.7V to 5.5V Supply Voltage

♦ Fast 400kHz I2C-Compatible 2-Wire

Serial Interface

♦ Schmitt-Trigger Inputs for Direct Interfacing

to Optocouplers

♦ Rail-to-Rail Output Buffer Amplifiers

♦ Three Software-Selectable Power-Down Output

Impedances

100kΩ, 1kΩ, and High Impedance

♦ Readback Mode for Bus and Data Checking

♦ Power-On Reset to Zero

♦ 8-Pin µMAX Package

MAX5820

Dual, 8-Bit, Low-Power, 2-Wire, Serial

Voltage-Output DAC

________________________________________________________________ Maxim Integrated Products 1

Pin Configuration

Ordering Information

R

P

R

P

V

DD

µC

SDA

SCL

SDA

SDA

REF

REF

REF

SCL

SCL

V

DD

V

DD

R

S

R

S

V

DD

OUTA

OUTB

OUTA

OUTB

MAX5820

MAX5820

R

S

R

S

Typical Operating Circuit

19-3538; Rev 0; 2/05

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.

µMAX is a registered trademark of Maxim Integrated Products, Inc.
*Purchase of I

2

C components from Maxim Integrated Products, Inc., or one of its sublicensed Associate Companies, conveys a

license under the Philips I

2

C Patent Rights to use these components in an I2C system, provided that the system conforms to the

I

2

C Standard Specification defined by Philips.

PART

MAX5820LEUA -40°C to +85°C 8 µMAX 0111 00X

MAX5820MEUA -40°C to +85°C 8 µMAX 1011 00X

TEMP

RANGE

PIN­PACKAGE

ADDRESS

TOP VIEW

1

V

DD

2

87OUTB

OUTAGND

MAX5820

3

ADD

4

µMAX

REF

6

SDASCL

5

MAX5820

Dual, 8-Bit, Low-Power, 2-Wire, Serial
Voltage-Output DAC

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VDD= +2.7V to +5.5V, GND = 0, V

REF

= VDD, 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_, REF, ADD to GND..............................-0.3V to V

DD

+ 0.3V

Maximum Current into Any Pin............................................50mA

Continuous Power Dissipation (T

A

= +70°C)

8-Pin µMAX (derate 4.5mW above +70°C) ...................362mW

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

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

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

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

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

STATIC ACCURACY (NOTE 2)

Resolution N 8 Bits

Integral Nonlinearity INL (Note 3) ±0.5 ±1 LSB

Differential Nonlinearity DNL Guaranteed monotonic (Note 2) ±0.5 LSB

Zero-Code Error ZCE Code = 00 hex, VDD = 2.7V 6 40 mV

Zero-Code Error Tempco 2.3 ppm/oC

Gain Error GE Code = FF hex -0.8 -3 %FSR

Gain-Error Tempco 0.26 ppm/oC

Power-Supply Rejection Ratio PSRR Code = FF hex, VDD = 4.5V to 5.5V 58.8 dB

DC Crosstalk 30 µV

REFERENCE INPUT

Reference Input Voltage Range V

Reference Input Impedance 65 90 kΩ

Reference Current Power-down mode 0.3 1 µA

DAC OUTPUT

Output Voltage Range No load (Note 4) 0 V

DC Output Impedance Code = 80 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

REF

VDD = 5V, V

V

DD

VDD = 5V 8

V

DD

Power-down mode = high impedance,
V

DD

IH

IL

OUT

= 3V, V

OUT

= 3V 8

= 5.5V, V

= full scale (short to GND) 42.2

= full scale (short to GND) 15.1

_ = VDD to GND

OUT

0V

±0.1 ±1 µA

0.7 x
V

DD

0.3 x
V

DD

DD

DD

V

V

mA

µs

V

V

MAX5820

Dual, 8-Bit, Low-Power, 2-Wire, Serial

Voltage-Output DAC

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(VDD= +2.7V to +5.5V, GND = 0, V

REF

= VDD, 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)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Input Hysteresis

Input Leakage Current Digital inputs = 0 or V

Input Capacitance 6pF

DIGITAL OUTPUT (SDA)

Output Logic-Low Voltage V

Tri-State Leakage Current I

Tri-State Output Capacitance 6pF

DYNAMIC PERFORMANCE

Voltage-Output Slew Rate SR 0.5 V/µs

Voltage-Output Settling Time

Digital Feedthrough Code = 00 hex, digital inputs from 0 to V

Digital-to-Analog Glitch Impulse

DAC-to-DAC Crosstalk 2.4 nV-s

POWER SUPPLIES

Supply Voltage Range V

Supply Current with No Load I

Power-Down Supply Current I

TIMING CHARACTERISTICS (FIGURE 1)

Serial Clock Frequency f

Bus Free Time Between STOP
and START Conditions

START Condition Hold Time tHD,

SCL Pulse-Width Low t

SCL Pulse-Width High t

Repeated START Setup Time tSU,

Data Hold Time tHD,

Data Setup Time tSU,

SDA and SCL Receiving
Rise Time

SDA and SCL Receiving
Fall Time

SDA Transmitting Fall Time t

I

OL

L

DD

DD

DDPD

SCL

t

BUF

STA

LOW

HIGH

STA

DAT

DAT

t

r

t

f

f

= 3mA 0.4 V

SINK

Digital inputs = 0 or V

To 0.5 LSB code 40 hex to C0 hex or
C0 hex to 40 hex (Note 5)

Major carry transition (code = 7F hex to 80
hex and 80 hex to 7F hex)

All digital inputs at 0 or VDD = 3.6V 115 205

All digital inputs at 0 or VDD = 5.5V 135 215

All digital inputs at 0 or VDD = 5.5V 0.3 1 µA

(Note 5) 0 300 ns

(Note 5) 0 300 ns

(Note 5)

DD

DD

0.05 x
V

DD

±0.1 ±1µA

±0.1 ±1µA

412µs

DD

2.7 5.5 V

0 400 kHz

1.3 µs

0.6 µs

1.3 µs

0.6 µs

0.6 µs

0 0.9 µs

100 ns

20 +

0.1C

0.2 nV-s

12 nV-s

b

V

µA

250 ns

MAX5820

Dual, 8-Bit, Low-Power, 2-Wire, Serial
Voltage-Output DAC

4 _______________________________________________________________________________________

Typical Operating Characteristics

(VDD= +5V, RL= 5kΩ, TA= +25°C.)

ELECTRICAL CHARACTERISTICS (continued)

(VDD= +2.7V to +5.5V, GND = 0, V

REF

= VDD, 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)

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 7 to 248.
Note 4: Offset and gain error limit the FSR.
Note 5: Guaranteed by design. Not production tested.

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

STOP Condition Setup Time tSU,

Bus Capacitance C

Maximum Duration of
Suppressed Pulse Widths

STO

(Note 5) 400 pF

b

t

SP

0.6 µs

050ns

INTEGRAL NONLINEARITY

vs. INPUT CODE

MAX5820 toc01

1.25

1.00

0.75

INL (LSB)

0.50

0.25

0

1.00

0.75

0.50

0.25

0

INL (LSB)

-0.25

-0.50

-0.75

-1.00
0256

INPUT CODE

19212864

DIFFERENTIAL NONLINEARITY

1.00

vs. INPUT CODE

0.75

0.50

0.25

0

DNL (LSB)

-0.25

-0.50

-0.75

-1.00
0256

INPUT CODE

19212864

MAX5820 toc04

0

-0.1

-0.2

DNL (LSB)

-0.3

-0.4

-0.5

INTEGRAL NONLINEARITY

vs. SUPPLY VOLTAGE

2.7 5.5
SUPPLY VOLTAGE (V)

4.84.13.4

DIFFERENTIAL NONLINEARITY

vs. SUPPLY VOLTAGE

2.7 5.5
SUPPLY VOLTAGE (V)

4.84.13.4

MAX5820 toc02

MAX5820 toc05

1.25

1.00

0.75

INL (LSB)

0.50

0.25

0

-40 85

DIFFERENTIAL NONLINEARITY

0

-0.1

-0.2

DNL (LSB)

-0.3

-0.4

-0.5

-40 85

INTEGRAL NONLINEARITY

vs. TEMPERATURE

TEMPERATURE (°C)

vs. TEMPERATURE

TEMPERATURE (°C)

MAX5820 toc03

603510-15

MAX5820 toc06

603510-15