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MAX5821LEUAMAXN/a53avaiDual, 10-Bit, Low-Power, 2-Wire, Serial Voltage-Output DAC


MAX5821LEUA ,Dual, 10-Bit, Low-Power, 2-Wire, Serial Voltage-Output DACApplications MAX5821LEUA -40 C to +85 C 8 µMAX 0111 00Xo oMAX5821MEUA -40 C to +85 C 8 µMAX 1011 00 ..
MAX5822LEUA+ ,Dual, 12-Bit, Low-Power, 2-Wire, Serial Voltage-Output DACApplicationso oMAX5822LEUA -40 C to +85 C 8 µMAX 0111 00XDigital Gain and Offset Adjustmentso oMAX5 ..
MAX5822LEUA+ ,Dual, 12-Bit, Low-Power, 2-Wire, Serial Voltage-Output DACELECTRICAL CHARACTERISTICS(V = +2.7V to +5.5V, GND = 0, V = V , R = 5kΩ , C = 200pF, T = T to T , u ..
MAX5839BCMH ,Octal, 13-Bit Voltage-Output DAC with Parallel Interfacefeatures double-buffered interface logic Double-Buffered Digital Inputswith a 13-bit parallel data ..
MAX5841LEUB ,Quad, 10-Bit, Low-Power, 2-Wire, Serial Voltage-Output DACApplicationso oMAX5841MEUB -40 C to +85 C 10 µMAX 1011 10XDigital Gain and Offset AdjustmentsProgra ..
MAX5841LEUB+ ,Quad, 10-Bit, Low-Power, 2-Wire, Serial Voltage-Output DACApplicationso oMAX5841MEUB -40 C to +85 C 10 µMAX 1011 10XDigital Gain and Offset AdjustmentsProgra ..
MAZ8039L ,Silicon planar typeAbsolute Maximum Ratings T = 25°CaMarking SymbolParameter Symbol Rating UnitRefer to the list of t ..
MAZ8039-L ,Silicon planar typeElectrical Characteristics T = 25°CaParameter Symbol Conditions Min Typ Max UnitForward voltage V ..
MAZ8043-H ,Silicon planar typeelectrical characteristicsZ Zwithin part numbersReverse current I V ··············· Specified value ..
MAZ8043-L ,Silicon planar typeAbsolute Maximum Ratings T = 25°CaMarking SymbolParameter Symbol Rating UnitRefer to the list of t ..
MAZ8043-M ,Silicon planar typeZener DiodesMAZ8000 SeriesSilicon planar typeUnit : mmFor stabilization of power supplyKA
MAZ8047 ,Small-signal deviceelectrical characteristicswithin part numbersReverse current I V Specified value µ AR R*3Temperatur ..


MAX5821LEUA
Dual, 10-Bit, Low-Power, 2-Wire, Serial Voltage-Output DAC
General Description
The MAX5821 is a dual, 10-bit voltage-output, digital-to-
analog 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
MAX5821 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 100kΩpower-
down mode.
The MAX5821 features a double-buffered I2C-compati-
ble serial interface that allows multiple devices to share
a single bus. All logic inputs are CMOS-logic compati-
ble and buffered with Schmitt triggers, allowing direct
interfacing to optocoupled and transformer-isolated
interfaces. The MAX5821 minimizes digital noise
feedthrough by disconnecting the clock (SCL) signal
from the rest of the device when an address mismatch
is detected.
The MAX5821 is specified over the extended tempera-
ture range of -40°C to +85°C and is available in a
miniature 8-pin µMAX package. Refer to the MAX5822
data sheet for the 12-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 VDD= 3.6V
135µA at VDD= 5.5V
300nA Low-Power Power-Down ModeSingle 2.7V to 5.5V Supply VoltageFast 400kHz I2C-Compatible 2-Wire
Serial Interface
Schmitt-Trigger Inputs for Direct Interfacing
to Optocouplers
Rail-to-Rail Output Buffer AmplifiersThree Software-Selectable Power-Down Output
Impedances
100kΩ, 1kΩ, and High Impedance
Read-Back Mode for Bus and Data CheckingPower-On Reset to Zero8-Pin µMAX Package
MAX5821
Dual, 10-Bit, Low-Power, 2-Wire, Serial
Voltage-Output DAC
Pin Configuration
Ordering Informationypical Operating Circuit

19-2316; Rev 0; 1/02
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.2C is a trademark of Philips Corp.
230
MAX5821
Dual, 10-Bit, Low-Power, 2-Wire, Serial
Voltage-Output DAC
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS

(VDD= +2.7V to +5.5V, GND = 0, VREF= VDD, RL= 5kΩ, CL= 200pF, TA= TMINto TMAX, unless otherwise noted. Typical values are
at VDD= +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 VDD+ 0.3V
Maximum Current into Any Pin............................................50mA
Continuous Power Dissipation (TA= +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
MAX5821
Dual, 10-Bit, Low-Power, 2-Wire, Serial
Voltage-Output DAC
ELECTRICAL CHARACTERISTICS (continued)

(VDD= +2.7V to +5.5V, GND = 0, VREF= VDD, RL= 5kΩ, CL= 200pF, TA= TMINto TMAX, unless otherwise noted. Typical values are
MAX5821
Dual, 10-Bit, Low-Power, 2-Wire, Serial
Voltage-Output DAC
INTEGRAL NONLINEARITY
vs. INPUT CODE

MAX5821 toc01
INPUT CODE
INL (LSB)
INTEGRAL NONLINEARITY
vs. SUPPLY VOLTAGE
MAX5821 toc02
SUPPLY VOLTAGE (V)
INL (LSB)
INTEGRAL NONLINEARITY
vs. TEMPERATURE
MAX5821 toc03
TEMPERATURE (°C)
INL (LSB)3510-15
DIFFERENTIAL NONLINEARITY
vs. INPUT CODE
MAX5821 toc04
INPUT CODE
DNL (LSB)
DIFFERENTIAL NONLINEARITY
vs. SUPPLY VOLTAGE
MAX5821 toc05
SUPPLY VOLTAGE (V)
DNL (LSB)
DIFFERENTIAL NONLINEARITY
vs. TEMPERATURE
MAX5821 toc06
TEMPERATURE (°C)
DNL (LSB)3510-15
Typical Operating Characteristics
(VDD= +5V, RL= 5kΩ, TA= +25°C.)
ELECTRICAL CHARACTERISTICS (continued)

(VDD= +2.7V to +5.5V, GND = 0, VREF= VDD, RL= 5kΩ, CL= 200pF, TA= TMINto TMAX, unless otherwise noted. Typical values are
at VDD= +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= TMINto TMAX.
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.
MAX5821
Dual, 10-Bit, Low-Power, 2-Wire, Serial
Voltage-Output DAC
ZERO-CODE ERROR
vs. SUPPLY VOLTAGE

MAX5821 toc07
SUPPLY VOLTAGE (V)
ZERO-CODE ERROR (mV)
ZERO-CODE ERROR
vs. TEMPERATURE
MAX5821 toc08
TEMPERATURE (°C)
ZERO-CODE ERROR (mV)3510-15
GAIN ERROR vs. SUPPLY VOLTAGE
MAX5821 toc09
SUPPLY VOLTAGE (V)
GAIN ERROR (%FSR)
GAIN ERROR vs. TEMPERATURE
MAX5821 toc10
TEMPERATURE (°C)
GAIN ERROR (%FSR)3510-15
DAC OUTPUT VOLTAGE
vs. OUTPUT SOURCE CURRENT (NOTE 6)
MAX5821 toc11
OUTPUT SOURCE CURRENT (mA)
DAC OUTPUT VOLTAGE (V)642
DAC OUTPUT VOLTAGE
vs. OUTPUT SINK CURRENT (NOTE 6)
MAX5821 toc12
OUTPUT SINK CURRENT (mA)
DAC OUTPUT VOLTAGE (V)642
SUPPLY CURRENT vs. INPUT CODE
MAX5821 toc13
INPUT CODE
SUPPLY CURRENT (
SUPPLY CURRENT vs. TEMPERATURE
MAX5821 toc14
TEMPERATURE (°C)
SUPPLY CURRENT (3510-15
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX5821 toc15
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (
2.75.5ypical Operating Characteristics (continued)
(VDD= +5V, RL= 5kΩ, TA= +25°C.)
MAX5821
Dual, 10-Bit, Low-Power, 2-Wire, Serial
Voltage-Output DAC
POWER-DOWN SUPPLY CURRENT
vs. SUPPLY VOLTAGE

MAX5821 toc16
SUPPLY VOLTAGE (V)
POWER-DOWN SUPPLY CURRENT (nA)
POWER-UP GLITCH
MAX5821 toc17
100µs/div
VDD
OUT_
10mV/div
EXITING SHUTDOWN

MAX5821 toc18
2µs/div
OUT_500mV/div
MAJOR CARRY TRANSITION
(POSITIVE)

MAX5821 toc19
2µs/div
OUT_5mV/div
MAJOR CARRY TRANSITION
(NEGATIVE)

MAX5821 toc20
2µs/div
OUT_5mV/div
SETTLING TIME
(POSITIVE)

MAX5821 toc21
2µs/div
OUT_500mV/div
SETTLING TIME
(NEGATIVE)

MAX5821 toc22
2µs/div
OUT_500mV/div
DIGITAL FEEDTHROUGH

MAX5821 toc23
40µs/div
OUT_2mV/div
SCL2V/div
CROSSTALK

MAX5821 toc24
4µs/div
VOUTB1mV/div
VOUTA2V/div
Typical Operating Characteristics (continued)

(VDD= +5V, RL= 5kΩ, TA= +25°C.)
Note 6:
The ability to drive loads greater than 5kΩis not implied.
Detailed Description
The MAX5821 is a dual, 10-bit, voltage-output DAC with
an I2C/SMBus-compatible 2-wire interface. The device
consists of a serial interface, power-down circuitry, dual
input and DAC registers, two 10-bit resistor string
DACs, two unity-gain output buffers, and output resistor
networks. The serial interface decodes the address and
control bits, routing the data to the proper input or DAC
register. Data can be directly written to the DAC regis-
ter, immediately updating the device output, or can be
written to the input register without changing the DAC
output. Both registers retain data as long as the device
is powered.
DAC Operation

The MAX5821 uses a segmented resistor string DAC
architecture, which saves power in the overall system
and guarantees output monotonicity. The MAX5821’s
input coding is straight binary, with the output voltage
given by the following equation:
where N = 10 (bits), and D = the decimal value of the
input code (0 to 1023).
Output Buffer

The MAX5821 analog outputs are buffered by preci-
sion, unity-gain followers that slew 0.5V/µs. Each buffer
output swings rail-to-rail, and is capable of driving 5kΩ
in parallel with 200pF. The output settles to ±0.5LSB
within 4µs.
Power-On Reset

The MAX5821 features an internal POR circuit that ini-
tializes the device upon power-up. The DAC registers
are set to zero scale and the device is powered down,
with the output buffers disabled and the outputs pulled
to GND through the 100kΩtermination resistor.
Following power-up, a wake-up command must be initi-
ated before any conversions are performed.
Power-Down Modes

The MAX5821 has three software-controlled low-power
power-down modes. All three modes disable the output
buffers and disconnect the DAC resistor strings from
REF, reducing supply current draw to 1µA and the ref-
erence current draw to less than 1µA. In power-down
mode 0, the device output is high impedance. In
power-down mode 1, the device output is internally
pulled to GND by a 1kΩtermination resistor. In power-
down mode 2, the device output is internally pulled to
GND by a 100kΩtermination resistor. Table 1 shows
the power-down mode command words.
Upon wake-up, the DAC output is restored to its previ-
ous value. Data is retained in the input and DAC regis-
ters during power-down mode.
Digital Interface

The MAX5821 features an I2C/SMBus-compatible 2-
wire interface consisting of a serial data line (SDA) and
a serial clock line (SCL). The MAX5821 is SMBus com-
patible within the range of VDD= 2.7V to 3.6V. SDA and
SCL facilitate bidirectional communication between the
MAX5821 and the master at rates up to 400kHz. Figure
1 shows the 2-wire interface timing diagram. The
MAX5821 is a transmit/receive slave-only device, rely-
ing upon a master to generate a clock signal. The mas-
ter (typically a microcontroller) initiates data transfer on
the bus and generates SCL to permit that transfer.
A master device communicates to the MAX5821 by
transmitting the proper address followed by command
and/or data words. Each transmit sequence is framed
by a START (S) or REPEATED START (Sr) condition and
a STOP (P) condition. Each word transmitted over the
MAX5821
Dual, 10-Bit, Low-Power, 2-Wire, Serial
Voltage-Output DAC
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