MAX520BEWE ,Quad/Octal, 2-Wire Serial 8-Bit DACs with Rail-to-Rail OutputsGeneral Description ________
MAX521ACAG ,Quad/Octal, 2-Wire Serial 8-Bit DACs with Rail-to-Rail OutputsELECTRICAL CHARACTERISTICS(V = 5V ±10%, V = 4V, R = ¥ (MAX520), R = 10kΩ (MAX521), C = 0pF (MAX520) ..
MAX521ACAG ,Quad/Octal, 2-Wire Serial 8-Bit DACs with Rail-to-Rail OutputsApplicationsOrdering Information continued at end of data sheet.Minimum Component Analog Systems†MA ..
MAX521ACAG+ ,Quad/Octal, 2-Wire Serial 8-Bit DACs with Rail-to-Rail OutputsMAX520/MAX52119-0378; Rev 3; 9/96Quad/Octal, 2-Wire Serial 8-Bit DACsw ith Rail-to-Rail Outputs____ ..
MAX521ACPP ,Quad/Octal, 2-Wire Serial 8-Bit DACs with Rail-to-Rail OutputsFeatures' Single +5V SupplyThe MAX520/MAX521 are quad/octal, 8-bit voltage-outputdigital-to-analog ..
MAX521ACWG ,Octal, 2-wire serial 8-bit DAC with Rail-to-Rail, unbuffered outputs. TUE(LSB) 1.ApplicationsOrdering Information continued at end of data sheet.Minimum Component Analog Systems†MA ..
MAX9710ETP+ ,3W Mono/Stereo BTL Audio Power Amplifiers with Shutdownfeatures♦ Low Quiescent Current: 7mA include low 2mV V (minimizing DC current drainOS♦ Low-Power Sh ..
MAX9710ETP+T ,3W Mono/Stereo BTL Audio Power Amplifiers with ShutdownApplications12-Thin QFN-EP* MonoMAX9711ETC -40°C to +85°CNotebook PCs Two-Way Radios *EP = Exposed ..
MAX9711 ,3W Mono/Stereo BTL Audio Power Amplifiers with ShutdownBlock DiagramPin ConfigurationsTOP VIEWSINGLE SUPPLY4.5V TO 5.5V20 19 18 17 16LEFT IN15 PGNDINL 1BI ..
MAX9711ETC+ ,3W Mono/Stereo BTL Audio Power Amplifiers with Shutdownfeatures♦ Low Quiescent Current: 7mA include low 2mV V (minimizing DC current drainOS♦ Low-Power Sh ..
MAX9711ETC+T ,3W Mono/Stereo BTL Audio Power Amplifiers with ShutdownFeaturesThe MAX9710/MAX9711 are stereo/mono 3W bridge-tied♦ 3W into 3Ω (1% THD+N)load (BTL) audio p ..
MAX9712EUB , 500mW, Low EMI, Filterless, Class D Audio Amplifier
MAX520ACAP-MAX520ACPE-MAX520ACWE-MAX520AEAP-MAX520AEWE-MAX520BCWE-MAX520BEAP-MAX520BEWE-MAX521ACAG-MAX521ACPP-MAX521AEAG-MAX521AEWG-MAX521BCAG-MAX521BCWG-MAX521BEAG
Quad/Octal, 2-Wire Serial 8-Bit DACs with Rail-to-Rail Outputs
_______________General DescriptionThe MAX520/MAX521 are quad/octal, 8-bit voltage-output
digital-to-analog converters (DACs) with simple 2-wire ser-
ial interfaces that allow communication between multiple
devices. They operate from a single +5V supply and their
reference input range includes both supply rails.
The MAX521 includes rail-to-rail output buffer amplifiers for
reduced system size and component count when driving
loads. The MAX520’s unbuffered voltage outputs reduce
the device’s total supply current to 4µA and provide
increased accuracy at low output currents.
The MAX520/MAX521 feature a serial interface and internal
software protocol, allowing communication at data rates up
to 400kbps. The interface, combined with the double-
buffered input configuration, allows the DAC registers to be
updated individually or simultaneously. In addition, the
devices can be put into a low-power shutdown mode that
reduces supply current to 4µA. Power-on reset ensures the
DAC outputs are at 0V when power is initially applied.
The MAX520 is available in 16-pin DIP and wide SO pack-
ages, as well as a space-saving 20-pin SSOP. The
MAX521 comes in 20-pin DIP and 24-pin SO packages, as
well as a space-saving 24-pin SSOP.
________________________ApplicationsMinimum Component Analog Systems
Digital Offset/Gain Adjustment
Industrial Process Control
Automatic Test Equipment
Programmable Attenuators
____________________________FeaturesSingle +5V SupplySimple 2-Wire Serial InterfaceI2C CompatibleOutputs Swing Rail to Rail:
Unbuffered Outputs (MAX520)
Buffered Outputs (MAX521)1%-Accurate Trimmed Output Resistance (MAX520A)Ultra-Low 4µA Supply Current (MAX520)Individual DACs Have Separate Reference InputsPower-On Reset Clears All Latches4µA Power-Down Mode
MAX520/MAX521
Quad/Octal, 2-Wire Serial 8-Bit DACs
with Rail-to-Rail Outputs
_________________Pin Configurations
_______________Functional Diagrams
______________Ordering Information19-0378; Rev 3; 9/96
Ordering Information continued at end of data sheet.†MAX520 “A” grade parts include a 1%-accurate, factory-trimmed
output resistance.
MAX520/MAX521
Quad/Octal, 2-Wire Serial 8-Bit DACs
with Rail-to-Rail Outputs
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VDD= 5V ±10%, VREF_= 4V, RL= ¥(MAX520), RL= 10kΩ(MAX521), CL= 0pF (MAX520), CL= 100pF (MAX521), TA= TMINto TMAX,
unless otherwise noted. Typical values are at TA= +25°C)
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.
VDDto DGND...........................................................-0.3V to +6V
VDDto AGND............................................................-0.3V to +6V
OUT_..........................................................-0.3V to (VDD+ 0.3V)
REF_...........................................................-0.3V to (VDD+ 0.3V)
AD0, AD1, AD2...........................................-0.3V to (VDD+ 0.3V)
SCL, SDA to DGND..................................................-0.3V to +6V
AGND to DGND.....................................................-0.3V to +0.3V
Maximum Current into Any Pin............................................50mA
Continuous Power Dissipation (TA= +70°C)
16-Pin Plastic DIP (derate 10.53mW/°C above +70°C)....842mW
20-Pin Plastic DIP (derate 11.11mW/°C above +70°C)....889mW
16-Pin Wide SO (derate 9.52mW/°C above +70°C)......762mW
24-Pin Wide SO (derate 11.76mW/°C above +70°C)....941mW
20-Pin SSOP (derate 8.00mW/°C above +70°C).........640mW
24-Pin SSOP (derate 8.00mW/°C above +70°C).........640mW
16-Pin CERDIP (derate 10.00mW/°C above +70°C)....800mW
20-Pin CERDIP (derate 11.11mW/°C above +70°C)....889mW
Operating Temperature Ranges
MAX520_C_ _/MAX521_C_ _..............................0°C to +70°C
MAX520_E_ _/MAX521_E_ _...........................-40°C to +85°C
MAX520_MJE/MAX521BMJP........................-55°C to +125°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10sec).............................+300°C
MAX520/MAX521
Quad/Octal, 2-Wire Serial 8-Bit DACs
with Rail-to-Rail Outputs
ELECTRICAL CHARACTERISTICS (continued)(VDD= 5V ±10%, VREF_= 4V, RL= ¥(MAX520), RL= 10kΩ(MAX521), CL= 0pF (MAX520), CL= 100pF (MAX521), TA= TMINto TMAX,
unless otherwise noted. Typical values are at TA= +25°C)
MAX520/MAX521
Quad/Octal, 2-Wire Serial 8-Bit DACs
with Rail-to-Rail Outputs
Note 1:Input resistance is code dependent. The lowest input resistance occurs at code = 55 hex.
Note 2:Input capacitance is code dependent. The highest input capacitance occurs at code = FF hex.
Note 3:VREF_= 4Vp-p, 10kHz. Channel-to-channel isolation is measured by setting the code of one DAC to FF hex and setting the
code of all other DACs to 00 hex.
Note 4:VREF_= 4Vp-p, 10kHz, DAC code = 00 hex.
Note 5:Guaranteed by design.
Note 6:I2C-compatible mode.
Note 7:Output settling time is measured by taking the code from 00 hex to FF hex, and from FF hex to 00 hex.
ELECTRICAL CHARACTERISTICS (continued)(VDD= 5V ±10%, VREF_= 4V, RL= ¥(MAX520), RL= 10kΩ(MAX521), CL= 0pF (MAX520), CL= 100pF (MAX521), TA= TMINto TMAX,
unless otherwise noted. Typical values are at TA= +25°C)
MAX520/MAX521
Quad/Octal, 2-Wire Serial 8-Bit DACs
with Rail-to-Rail Outputs
Note 8:A master device must provide a hold time of at least 300ns for the SDA signal (referred to VILof the SCL signal) in order to
bridge the undefined region of SCL’s falling edge.
Note 9:Cb = total capacitance of one bus line in pF. tRand tfmeasured between 0.3VDDand 0.7VDD.
Note 10:An input filter on the SDA and SCL input suppresses noise spikes less than 50ns.
Note 11:Guaranteed by design.
TIMING CHARACTERISTICS(VDD= 5V ±10%, TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.)
__________________________________________Typical Operating Characteristics(VDD= 5V, DAC outputs unloaded, TA = +25°C, unless otherwise noted.)
MAX520
SUPPLY CURRENT vs. TEMPERATURE
MAX520/521-01
TEMPERATURE (°C)
IDD
MAX520
REFERENCE INPUT CURRENT vs.
TEMPERATURE (SHUTDOWN MODE)
MAX520/521-02
TEMPERATURE (°C)
SHUTDOWN REFERENCE CURRENT (nA)
0600100k10k1M10M
MAX520
REFERENCE VOLTAGE INPUT
FREQUENCY RESPONSEMAX520/521-03
FREQUENCY (Hz)
RELATIVE OUTPUT (dB)
-10
MAX520/MAX521
Quad/Octal, 2-Wire Serial 8-Bit DACs
with Rail-to-Rail Outputs
______________________________Typical Operating Characteristics (continued)(VDD= 5V, DAC outputs unloaded, TA = +25°C, unless otherwise noted.)
MAX520/MAX521
Quad/Octal, 2-Wire Serial 8-Bit DACs
with Rail-to-Rail OutputsMAX521
SUPPLY CURRENT vs. TEMPERATURE
MAX520/521-08
TEMPERATURE (°C)
ICC
(mA)100
MAX521
SHUTDOWN SUPPLY CURRENT
vs. TEMPERATUREMAX520/521-09
TEMPERATURE (°C)
SHUTDOWN I1001035
MAX521
SUPPLY CURRENT
vs. REFERENCE VOLTAGEMAX520/521-10
REFERENCE VOLTAGE (V)
ICC
(mA)
MAX521
DAC OUTPUT HIGH VOLTAGE
vs. OUTPUT SOURCE CURRENT
MAX520/521-11
OUTPUT SOURCE CURRENT (mA)
- V
OUT
(V)
MAX521
DAC OUTPUT LOW VOLTAGE
vs. OUTPUT SINK CURRENT
MAX520/521-12
OUTPUT SINK CURRENT (mA)
OUT
(V)
0.4100k10k1M10M
MAX521
REFERENCE VOLTAGE INPUT
FREQUENCY RESPONSEMAX520/521-13
FREQUENCY (Hz)
RELATIVE OUTPUT (dB)
__________________________________________Typical Operating Characteristics
(VDD= 5V, DAC outputs unloaded, TA = +25°C, unless otherwise noted.)
MAX520/MAX521
Quad/Octal, 2-Wire Serial 8-Bit DACs
with Rail-to-Rail Outputs
______________________________Typical Operating Characteristics (continued)(VDD= 5V, DAC outputs unloaded, TA = +25°C, unless otherwise noted.)
MAX520/MAX521
Quad/Octal, 2-Wire Serial 8-Bit DACs
with Rail-to-Rail Outputs
MAX520/MAX521
Quad/Octal, 2-Wire Serial 8-Bit DACs
with Rail-to-Rail Outputs
_______________Detailed Description
Serial InterfaceThe MAX520/MAX521 use a simple 2-wire serial interface
requiring only two I/O lines (2-wire bus) of a standard
microprocessor (µP) port. Figure 1 shows the timing dia-
gram for signals on the 2-wire bus. Figure 2 shows the
typical application of the MAX520/MAX521. The 2-wire
bus can have several devices (in addition to the
MAX520/MAX521) attached. The two bus lines (SDA and
SCL) must be high when the bus is not in use. When in
use, the port bits are toggled to generate the appropriate
signals for SDA and SCL. External pull-up resistors are
not required on these lines. The MAX520/MAX521 can
be used in applications where pull-up resistors are
required (such as in I2C systems) to maintain compatibil-
ity with the existing circuitry.
The MAX520/MAX521 are receive-only devices and
must be controlled by a bus master device. They oper-
ate at SCL rates up to 400kHz. A master device sends
information to the devices by transmitting their address
over the bus and then transmitting the desired informa-
tion. Each transmission consists of a START condition,
the MAX520/MAX521’s programmable slave-address,
one or more command-byte/output-byte pairs (or a
command byte alone, if it is the last byte in the trans-
mission), and finally, a STOP condition (Figure 3).
The address byte and pairs of command and output
bytes are transmitted between the STARTand STOPcon-
ditions. The SDA state is allowed to change only while
SCL is low. SDA’s state is sampled, and therefore must
remain stable while SCL is high. The only exceptions to
this are the STARTand STOPconditions. Data is transmit-
ted in 8-bit bytes. Nine clock cycles are required to trans-
fer the data bits to the MAX520/MAX521. Set SDA low
during the 9th clock cycle as the MAX520/MAX521 pull
SDA low during this time. RC(Figure 2) limits the current
that flows during this time if SDA stays high for short peri-
ods of time.
Figure 3. A Complete Serial Transmission
