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MAX5120BEEEMaxim N/a8avai+3V/+5V, 12-Bit, Serial Voltage-Output DACs with Internal Reference


MAX5120BEEE ,+3V/+5V, 12-Bit, Serial Voltage-Output DACs with Internal ReferenceFeaturesThe MAX5120/MAX5121 are low-power, 12-bit, voltage-' Single-Supply Operationoutput digital- ..
MAX5120BEEE+ ,+3V/+5V, 12-Bit, Serial, Voltage-Output DACs with Internal ReferenceFeaturesThe MAX5120/MAX5121 are low-power, 12-bit, voltage-♦ Single-Supply Operationoutput digital- ..
MAX5122AEEE ,+5V/+3V, 12-Bit, Serial, Force/Sense DACs with 10ppm/∑C Internal ReferenceApplicationsPin ConfigurationIndustrial Process ControlAutomatic Test EquipmentTOP VIEWFB 1 16 VDDD ..
MAX5122BEEE ,+5V/+3V, 12-Bit, Serial, Force/Sense DACs with 10ppm/∑C Internal ReferenceELECTRICAL CHARACTERISTICS—MAX5122 (+5V)(V = +5V ±10%, AGND = DGND, 33nF capacitor at REFADJ, inter ..
MAX5122BEEE ,+5V/+3V, 12-Bit, Serial, Force/Sense DACs with 10ppm/∑C Internal Referenceapplications. Bothdevices draw only 500µA of supply current, which' Buffered Output Capable of Driv ..
MAX5123AEEE ,+5V/+3V / 12-Bit / Serial / Force/Sense DACs with 10ppm/C Internal ReferenceFeaturesThe MAX5122/MAX5123 low-power, 12-bit, voltage-out-' Single-Supply Operationput, digital-to ..
MAX951ESA+ ,Ultra-Low-Power, Single-Supply Op Amp + Comparator + ReferenceFeaturesThe MAX951–MAX954 feature combinations of a Op Amp + Comparator + Reference in an 8-Pinmic ..
MAX951ESA+T ,Ultra-Low-Power, Single-Supply Op Amp + Comparator + ReferenceFeaturesThe MAX951–MAX954 feature combinations of a Op Amp + Comparator + Reference in an 8-Pinmic ..
MAX951EUA+ ,Ultra-Low-Power, Single-Supply Op Amp + Comparator + ReferenceApplicationsInstruments, Terminals, and Bar-Code ReadersTOP VIEWBattery-Powered SystemsAutomotive K ..
MAX9526ATJ , Low-Power, High-Performance NTSC/PAL Video Decoder
MAX952EPA ,Ultra-Low-Power, Single-Supply Op Amp Comparator ReferenceMAX951–MAX95419-0431; Rev 1; 7/97Ultra-Low-Power, Single-Supply Op Amp + Comparator + Reference____ ..
MAX952ESA ,Ultra-Low-Power, Single-Supply Op Amp Comparator ReferenceMAX951–MAX95419-0431; Rev 1; 7/97Ultra-Low-Power, Single-Supply Op Amp + Comparator + Reference____ ..


MAX5120BEEE
+3V/+5V, 12-Bit, Serial Voltage-Output DACs with Internal Reference
General Description
The MAX5120/MAX5121 are low-power, 12-bit, voltage-
output digital-to-analog converters (DACs) with an inter-
nal precision bandgap reference and an output amplifier.
The MAX5120 operates on a +5V supply with an internal
amplifier reference of +2.5V and is capable of a +4.095V
full-scale output range. The MAX5121, operating on +3V,
delivers its +2.0475V full-scale output with an internal
precision reference of +1.25V. If necessary, the user can
override the internal, <10ppm/°C voltage reference with
an external reference. Both devices draw only 500µA of
supply current, which reduces to 3µA in power-down
mode. In addition, their power-up reset feature allows for
a user-selectable initial output state of either 0V or mid-
scale and minimizes output voltage glitches during
power-up.
The serial interface is compatible with SPI™, QSPI™
and MICROWIRE™, which makes the MAX5120/
MAX5121 suitable for cascading multiple devices. Each
DAC has a double-buffered input organized as an input
register followed by a DAC register. A 16-bit shift regis-
ter loads data into the input register. The DAC register
may be updated independently or simultaneously with
the input register.
Both devices are available in a 16-pin QSOP package
and are specified for the extended industrial (-40°C to
+85°C) temperature range. For pin-compatible 14-bit
upgrades, see the MAX5170/MAX5172 data sheet;
for pin-compatible 13-bit versions, see the MAX5130/
MAX5131 data sheet.
________________________Applications

Industrial Process Controls
Automatic Test Equipment (ATE)
Digital Offset and Gain Adjustment
Motion Control
µP-Controlled Systems
Features
Single-Supply Operation
+5V (MAX5120)
+3V (MAX5121)
Full-Scale Output Range
+4.095V (MAX5120)
+2.0475V (MAX5121)
Built-In 10ppm/°C (max) Precision Bandgap
Reference
+2.5V (MAX5120)
+1.25V (MAX5121)
Adjustable Output OffsetSPI/QSPI/MICROWIRE-Compatible, 3-Wire Serial
Interface
Pin-Programmable Shutdown Mode and Power-
Up Reset (0V or Midscale Output Voltage)
Buffered Output Capable of Driving 5kΩ100pF
or 4–20mA Loads
Space-Saving 16-Pin QSOP PackagePin-Compatible 13-Bit Upgrades Available
(MAX5130/MAX5131)
Pin-Compatible 14-Bit Upgrades Available
(MAX5170/MAX5172)
MAX5120/MAX5121
+3V/+5V, 12-Bit, Serial Voltage-Output DACs
with Internal Reference

19-1428; Rev 0; 2/99
Pin ConfigurationOrdering Information

SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
MAX5120/MAX5121
+3V/+5V, 12-Bit, Serial Voltage-Output DACs
with Internal Reference
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS—MAX5120 (+5V)

(VDD= +5V ±10%, OS = AGND = DGND = 0V, 33nF capacitor at REFADJ, internal reference, RL= 5kΩ, CL= 100pF, 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 AGND, DGND...............................................-0.3V to +6V
AGND to DGND.....................................................-0.3V to +0.3V
Digital Inputs to DGND.............................................-0.3V to +6V
Digital Outputs (DOUT, UPO) to DGND.....-0.3V to (VDD+ 0.3V)
OUT to AGND.............................................-0.3V to (VDD+ 0.3V)
OS to AGND...................................(AGND - 4V) to (VDD+ 0.3V)
REF, REFADJ to AGND..............................-0.3V to (VDD+ 0.3V)
Maximum Current into Any Pin............................................50mA
Continuous Power Dissipation (TA= +70°C)
QSOP (derate 8.00mW/°C above +70°C).....................667mW
Operating Temperature Range ..........................-40°C to +85°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10sec).............................+300°C
MAX5120/MAX5121
+3V/+5V, 12-Bit, Serial Voltage-Output DACs
with Internal Reference
ELECTRICAL CHARACTERISTICS—MAX5120 (+5V) (continued)

(VDD= +5V ±10%, OS = AGND = DGND = 0V, 33nF capacitor at REFADJ, internal reference, RL= 5kΩ, CL= 100pF, TA= TMINto
TMAX, unless otherwise noted. Typical values are at TA= +25°C.)
ELECTRICAL CHARACTERISTICS—MAX5121 (+3V)

(VDD= +3V ±10%, OS = AGND = DGND = 0V, 33nF capacitor at REFADJ, internal reference, RL= 5kΩ, CL= 100pF, TA= TMINto
TMAX, unless otherwise noted. Typical values are at TA= +25°C.)
MAX5120/MAX5121
+3V/+5V, 12-Bit, Serial Voltage-Output DACs
with Internal Reference
ELECTRICAL CHARACTERISTICS—MAX5121 (+3V) (continued)

(VDD= +3V ±10%, OS = AGND = DGND = 0V, 33nF capacitor at REFADJ, internal reference, RL= 5kΩ, CL= 100pF, TA= TMINto
TMAX, unless otherwise noted. Typical values are at TA= +25°C.)
TIMING CHARACTERISTICS—MAX5120 (+5V)

(VDD= +5V ±10%, OS = AGND = DGND = 0V, 33nF capacitor at REFADJ, internal reference, RL= 5kΩ, CL= 100pF, TA= TMINto
TMAX, unless otherwise noted. Typical values are at TA= +25°C.)
MAX5120/MAX5121
+3V/+5V, 12-Bit, Serial Voltage-Output DACs
with Internal Reference
Note 1:
Accuracy is guaranteed as shown in the following table:
Note 2:
Offset is measured at the code closest to 10mV.
Note 3:
The temperature coefficient is determined by the “box” method in which the maximum DVOUTover the temperature range is
divided by DT.
Note 4:
Accuracy is better than 1.0LSB for VOUT= 10mV to (VDD- 180mV). Guaranteed by PSR test on end points.
Note 5:
RLOAD= ¥and digital inputs are at either VDDor DGND.
TIMING CHARACTERISTICS—MAX5121 (+3V)

(VDD= +3V ±10%, OS = AGND = DGND = 0V, 33nF capacitor at REFADJ, internal reference, RL= 5kΩ, CL= 100pF, TA= TMINto
TMAX, unless otherwise noted. Typical values are at TA= +25°C.)
Typical Operating Characteristics

(VDD= +5V (MAX5120), VDD= +3V (MAX5121), RL= 5kΩ, CL= 100pF, OS = AGND, TA = +25°C, unless otherwise noted.)
MAX5120/MAX5121
+3V/+5V, 12-Bit, Serial Voltage-Output DACs
with Internal Referenceypical Operating Characteristics (continued)

(VDD= +5V (MAX5120), VDD= +3V (MAX5121), RL= 5kΩ, CL= 100pF, OS = AGND, TA = +25°C, unless otherwise noted.)
MAX5120/MAX5121
+3V/+5V, 12-Bit, Serial Voltage-Output DACs
with Internal Referenceypical Operating Characteristics (continued)

(VDD= +5V (MAX5120), VDD= +3V (MAX5121), RL= 5kΩ, CL= 100pF, OS = AGND, TA = +25°C, unless otherwise noted.)
MAX5120/MAX5121
+3V/+5V, 12-Bit, Serial Voltage-Output DACs
with Internal Referenceypical Operating Characteristics (continued)

(VDD= +5V (MAX5120), VDD= +3V (MAX5121), RL= 5kΩ, CL= 100pF, OS = AGND, TA = +25°C, unless otherwise noted.)
Pin Description
MAX5120/MAX5121
+3V/+5V, 12-Bit, Serial Voltage-Output DACs
with Internal Reference
_______________Detailed Description

The MAX5120/MAX5121 12-bit, voltage-output DACs
are easily configured with a 3-wire serial interface. They
include a 16-bit data-in/data-out shift register and have
a double-buffered input consisting of an input register
and a DAC register. In addition, these devices employ
precision bandgap references and trimmed internal
resistors to produce a gain of 1.6384V/V, maximizing
the output voltage swing (Figure 1). The MAX5120/
MAX5121 output amplifier’s offset-adjust pin allows for
a DC shift in the DAC outputs. The full-scale output volt-
age is +4.095V for the MAX5120 and +2.0475V for the
MAX5121. These DACs are designed with an inverted
R-2R ladder network (Figure 2) that produces a weight-
ed output voltage proportional to the digital input code.
Internal Reference

Both the MAX5120 and MAX5121 use an on-board pre-
cision bandgap reference to generate an output volt-
age of +2.5V (MAX5120) or +1.25V (MAX5121). With a
low temperature coefficient of only 10ppm/°C (max),
the REF pin can source up to 100µA and may become
unstable with capacitive loads exceeding 100pF.
REFADJ can be used for minor adjustments (1%) to the
reference voltage. Use the circuits shown in Figure 3a
Figure 1. Simplified Functional Diagram
MAX5120/MAX5121
(MAX5120) and Figure 3b (MAX5121) to achieve these
adjustments. Connect a 33nF capacitor from REFADJ
to AGND to establish low-noise operation of the DAC.
Larger capacitor values may be used, but will result in
increased start-up delay. The time constant (t) for the
start-up delay is determined by the REFADJ input
impedance of 4kΩand CREFADJ:= 4kΩ·CREFADJ
External Reference

An external reference may be applied to the REF pin.
Disable the internal reference by pulling REFADJ to
VDD. This allows an external reference signal (AC- or
DC-based) to be fed into the REF pin. For proper oper-
ation, do notexceed the input voltage range limits of
0V to (VDD- 1.4V) for VREF.
Determine the output voltage using the following equa-
tion (REFADJ = VDD; OS = AGND):
VOUT= [VREF·(NB / 4096)] ·1.6384V/V
where NB is the numeric value of the MAX5120/
MAX5121 input code (0 to 4095), VREFis the external
reference voltage, and 1.6384V/V is the gain of the
internal output amplifier. The REF pin has a minimum
input resistance of 40kΩand is code-dependent.
Output Amplifier

The output amplifier of the MAX5120/MAX5121
employs a trimmed resistor-divider to set a gain of
+1.6384V/V and minimize the gain error. With its on-
board laser-trimmed +1.25V reference and the output
buffer gain, the MAX5121 achieves a full-scale output
of +2.0475V, while the MAX5120 provides a +4.095V
full-scale output with a +2.5V reference.
The output amplifier has a typical slew rate of 0.6V/µs
and settles to ±0.5LSB within 20µs, with a load of 5kΩ
in parallel with 100pF. Loads less than 1kΩmay result
in degraded performance.
The OS pin may be used to adjust the output offset volt-
age. For instance, to achieve a +1V offset, apply
-1.566V (Offset = -[Output Buffer Gain - 1] ·VOS) to OS
to produce an output voltage range from +1V to (1V +
VREF·1.6384V/V). Note that the DAC’s output range is
still limited by the maximum output voltage specifica-
tion.
Power-Down Mode

The MAX5120/MAX5121 feature software- and hard-
ware-programmable (PD pin) shutdown modes that
reduce the typical supply current to 3µA. To enter soft-
ware shutdown mode, program the control sequence
for the DAC as shown in Table 1.
In shutdown mode, the amplifier output becomes high
impedance and the serial interface remains active.
Data in the input registers is saved, allowing the
MAX5120/MAX5121 to recall the output state prior to
entering shutdown when returning to normal operation
mode. To exit shutdown mode, load both input and
DAC registers simultaneously or update the DAC regis-
ter from the input register. When returning from shut-
down mode, wait 2ms for the reference to settle. When
using an external reference, the DAC requires only
20µs for the output to stabilize.
+3V/+5V, 12-Bit, Serial Voltage-Output DACs
with Internal Reference

Figure 3a. MAX5120 Reference Adjust CircuitFigure 3b. MAX5121 Reference Adjust Circuit
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