Rainbow Electronics MAX5123 User Manual

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General Description

The MAX5122/MAX5123 low-power, 12-bit, voltage-out­put, digital-to-analog converters (DACs) feature an inter­nal precision bandgap reference and output amplifier.

The MAX5122 operates on a single +5V supply with an
internal +2.5V reference, and offers a configurable output
amplifier. If necessary, the user can override the on-chip,
<10ppm/°C voltage reference with an external reference.
The MAX5123 has the same features as the MAX5122 but
operates from a single +3V supply and has an internal
+1.25V precision reference. The user-accessible inverting
input and output of the amplifier allows specific gain con­figurations, remote sensing, and high output drive capa­bility for a wide range of force/sense applications. 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 midscale and reduces output
glitches during power-up.

The serial interface is compatible with SPI™, QSPI™, and
MICROWIRE™, which makes the MAX5122/MAX5123
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 register 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) operating temperature range. For pin-compatible
14-bit upgrades, see the MAX5171/MAX5173 data sheet;
for the pin-compatible 13-bit version, see the MAX5132/
MAX5133 data sheet.

Applications

Industrial Process Control
Automatic Test Equipment
Digital Offset and Gain Adjustment
Motion Control
Microprocessor-Controlled Systems

Features

♦ Single-Supply Operation

+5V (MAX5122)
+3V (MAX5123)

♦ Built-In 10ppm/°C max Precision Bandgap Reference

+2.5V (MAX5122)
+1.25V (MAX5123)

♦ SPI/QSPI/MICROWIRE-Compatible, 3-Wire Serial

Interface

♦ Pin-Programmable Shutdown Mode and Power-

Up Reset (0 or Midscale Output Voltage)

♦ Buffered Output Capable of Driving 5kΩ 100pF

or 4–20mA Loads

♦ Space-Saving 16-Pin QSOP Package
♦ Pin-Compatible 13-Bit Upgrades Available

(MAX5132/MAX5133)

♦ Pin-Compatible 14-Bit Upgrades Available

(MAX5171/MAX5173)

MAX5122/MAX5123

+5V/+3V, 12-Bit, Serial, Force/Sense DACs

with 10ppm/°C Internal Reference

________________________________________________________________

Maxim Integrated Products

1

16
15
14
13
12
11
10

9

1
2
3
4
5
6
7
8

FB V

DD

REFADJ
REF
AGND
PD
UPO
DOUT
DGND

TOP VIEW

MAX5122
MAX5123

QSOP

OUT

RSTVAL

CS

PDL
CLR

DIN

SCLK

19-1446; Rev 0; 3/99

PART

MAX5122AEEE

MAX5122BEEE -40°C to +85°C

-40°C to +85°C

TEMP. RANGE

PIN-

PACKAGE

16 QSOP
16 QSOP

Pin Configuration

Ordering Information

INL

(LSB)

±0.5

±1
MAX5123AEEE
MAX5123BEEE±1-40°C to +85°C

-40°C to +85°C 16 QSOP
16 QSOP ±2

SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.

MAX5122/MAX5123

+5V/+3V, 12-Bit, Serial, Force/Sense DACs
with 10ppm/°C Internal Reference

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS—MAX5122 (+5V)

(VDD= +5V ±10%, AGND = DGND, 33nF capacitor at REFADJ, internal reference, RL= 5kΩ, CL= 100pF, output amplifier configured
in unity-gain, T

A

= T

MIN

to T

MAX

, 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 (V

DD

+ 0.3V)

FB, OUT to AGND ......................................-0.3V to (V

DD

+ 0.3V)

REF, REFADJ to AGND..............................-0.3V to (V

DD

+ 0.3V)

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

Continuous Power Dissipation (T

A

= +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

VIN= 0 or V

DD

MAX5122A

REFADJ = V

DD

4.5V ≤ VDD≤ 5.5V

MAX5123B

MAX5122B

MAX5122A

MAX5122A

TA= +25°C

CONDITIONS

pF8C

IN

Input Capacitance

µA-1 0.001 1I

IN

Input Leakage Current

mV200V

HYS

Input Hysteresis

V0.8V

IL

Input Low Voltage

V3V

IH

Input High Voltage

µA3.3 7REFADJ Current

ppm/°C

10

TCV

REF

3

Output Voltage Temperature
Coefficient

V2.475 2.5 2.525V

REF

Output Voltage

-0.5 0.5

Bits12NResolution

µV/V20 250PSRRPower-Supply Rejection Ratio

ppm/°C

10 30

TCV

FS

310

Full-Scale Temperature
Coefficient (Note 3)

LSB-1 1DNLDifferential Nonlinearity

mV-10 10V

OS

Offset Error (Note 2)

mV-3 -0.2 3GEGain Error

UNITSMIN TYP MAXSYMBOLPARAMETER

I

SINK

= 2mA

I

SOURCE

= 2mA

V0.13 0.4V

OL

Output Low Voltage

VVDD- 0.5V

OH

Output High Voltage

MAX5123B

LSB

-1 1

INLIntegral Nonlinearity (Note 1)

0 ≤ I

OUT

≤ 100µA (sourcing) µV/µA0.1 1V

OUT/IOUT

Reference External Load Regulation

mA4Reference Short-Circuit Current

STATIC PERFORMANCE

REFERENCE

DIGITAL INPUT

DIGITAL OUTPUTS

MAX5122/MAX5123

+5V/+3V, 12-Bit, Serial, Force/Sense DACs

with 10ppm/°C Internal Reference

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS—MAX5122 (+5V) (continued)

(VDD= +5V ±10%, AGND = DGND, 33nF capacitor at REFADJ, internal reference, RL= 5kΩ, CL= 100pF, output amplifier configured
in unity-gain, T

A

= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.)

To ±0.5LSB, V

STEP

= 2.5V

CS = VDD, f

SCLK

= 100kHz,

V

SCLK

= 5Vp-p

CONDITIONS

µA320I

SHDN

Power-Supply Current in Shutdown

µA500 600I

DD

Power-Supply Current (Note 5)

V4.5 5.5V

DD

Power-Supply Voltage (Note 5)

nV-sec5Digital Feedthrough

ms2Time Required to Exit Shutdown

µs20Output Settling Time

V0 to V

DD

Output Voltage Swing (Note 4)

UNITSMIN TYP MAXSYMBOLPARAMETER

ELECTRICAL CHARACTERISTICS—MAX5123 (+3V)

(VDD= +3V ±10%, AGND = DGND, 33nF capacitor at REFADJ, internal reference, RL= 5kΩ, CL= 100pF, output amplifier connected
in unity-gain, T

A

= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.)

MAX5123A

REFADJ = V

DD

2.7V ≤ VDD≤ 3.3V

MAX5123B

MAX5123B

MAX5123A

MAX5123A

TA= +25°C

CONDITIONS

mV200V

HYS

Input Hysteresis

V0.8V

IL

Input Low Voltage

V2.2V

IH

Input High Voltage

µA3.3 7REFADJ Current

mA4Reference Short-Circuit Current

ppm/°C

10

TCV

REF

MAX5123B

3

0 ≤ I

OUT

≤ 100µA (sourcing)

Output Voltage Temperature
Coefficient

V1.237 1.25 1.263V

REF

Output Voltage

-1 1

µV/µA0.1 1

Bits12NResolution

µV/V20 250PSRRPower-Supply Rejection Ratio

ppm/°C

10 30

TCV

FS

LSB

310

V

OUT/IOUT

Full-Scale Temperature
Coefficient (Note 3)

LSB-1 1DNLDifferential Nonlinearity

mV-10 10V

OS

Offset Error (Note 2)

Reference External Load Regulation

mV-5 -0.2 5GEGain Error

UNITSMIN TYP MAXSYMBOLPARAMETER

-2 2

INLIntegral Nonlinearity (Note 1)

V/µs0.6SRVoltage Output Slew Rate

STATIC PERFORMANCE

REFERENCE

DIGITAL INPUT

µA-0.1 0 0.1Current into FB

DYNAMIC PERFORMANCE

POWER REQUIREMENTS

MAX5122/MAX5123

+5V/+3V, 12-Bit, Serial, Force/Sense DACs
with 10ppm/°C Internal Reference

4 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS—MAX5123 (+3V) (continued)

(VDD= +3V ±10%, AGND = DGND, 33nF capacitor at REFADJ, internal reference, RL= 5kΩ, CL= 100pF, output amplifier connected
in unity-gain, T

A

= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.)

To ±0.5LSB, V

STEP

= 1.25V

CS = VDD, f

SCLK

= 100kHz,

V

SCLK

= 3Vp-p

CONDITIONS

µA320I

SHDN

Power-Supply Current in Shutdown

µA500 600I

DD

Power-Supply Current (Note 5)

V2.7 3.6V

DD

Power-Supply Voltage (Note 5)

nV-sec5Digital Feedthrough

ms2Time Required to Exit Shutdown

µA-0.1 0 0.1Current into FB

µs20Output Settling Time

V0 to V

DD

Output Voltage Swing (Note 4)

UNITSMIN TYP MAXSYMBOLPARAMETER

I

SINK

= 2mA V0.13 0.4V

OL

Output Low Voltage

I

SOURCE

= 2mA VVDD- 0.5V

OH

Output High Voltage

VIN= 0 or V

DD

µA-1 0.001 1I

IN

Input Leakage Current

pF8C

IN

Input Capacitance

V/µs0.6SRVoltage Output Slew Rate

TIMING CHARACTERISTICS—MAX5122 (+5V)

(VDD= +5V ±10%, AGND = DGND, 33nF capacitor at REFADJ, internal reference, RL= 5kΩ, CL= 100pF, output amplifier connected
in unity-gain, T

A

= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.)

ns40t

CSS

CS Fall to SCLK Rise Setup Time

ns40t

CL

SCLK Pulse Width Low

CONDITIONS

ns100t

CP

SCLK Clock Period

ns40t

CH

SCLK Pulse Width High

ns0t

CSH

SCLK Rise to CS Rise Hold Time

ns10t

CS0

SCLK Rise to CS Fall Delay Time

ns40t

DS

SDI Setup Time

ns0t

DH

SDI Hold Time

UNITSMIN TYP MAXSYMBOLPARAMETER

ns100t

CSW

CS Pulse Width High

ns40t

CS1

CS Rise to SCLK Rise Hold Time

C

LOAD

= 200pF ns80t

DO1

SCLK Rise to DOUT Valid
Propagation Delay Time

C

LOAD

= 200pF ns80t

DO2

SCLK Fall to DOUT Valid
Propagation Delay Time

DIGITAL OUTPUTS

POWER REQUIREMENTS

DYNAMIC PERFORMANCE

MAX5122/MAX5123

+5V/+3V, 12-Bit, Serial, Force/Sense DACs

with 10ppm/°C Internal Reference

_______________________________________________________________________________________ 5

Note 1: Accuracy is guaranteed by the following table:

Note 2: Offset is measured at the code closest to 10mV.
Note 2: The temperature coefficient is determined by the “box” method, in which the maximum

∆V

OUT

over the temperature range

is divided by ∆T and the typical reference voltage.

Note 4: Accuracy is better than 1.0LSB for V

OUT

= 10mV to (VDD- 180mV). Guaranteed by PSR test on end points.

Note 5: R

LOAD

= ∞and digital inputs are at either VDDor DGND.

TIMING CHARACTERISTICS—MAX5123 (+3V)

(VDD= +3V ±10%, AGND = DGND, 33nF capacitor at REFADJ, internal reference, RL= 5kΩ, CL= 100pF, output amplifier connected
in unity-gain, T

A

= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.)

ns60t

CSS

CS Fall to SCLK Rise Setup Time

ns150

ns

C

LOAD

= 200pF

75

t

CSW

t

CL

SCLK Pulse Width Low

CONDITIONS

ns150t

CP

SCLK Clock Period

ns75t

CH

SCLK Pulse Width High

ns0t

CSH

SCLK Rise to CS Rise Hold Time

CS Pulse Width High

ns75t

CS1

CS Rise to SCLK Rise Hold Time

C

LOAD

= 200pF ns200t

DO1

SCLK Rise to DOUT Valid
Propagation Delay Time

ns200t

DO2

SCLK Fall to DOUT Valid
Propagation Delay Time

ns10t

CS0

SCLK Rise to CS Fall Delay Time

ns60t

DS

SDI Setup Time

ns0t

DH

SDI Hold Time

UNITSMIN TYP MAXSYMBOLPARAMETER

165
333

4095
4095

Accuracy Guaranteed

To Code:From Code:

V

DD

(V)

MAX5122/MAX5123

+5V/+3V, 12-Bit, Serial, Force/Sense DACs
with 10ppm/°C Internal Reference

6 _______________________________________________________________________________________

Typical Operating Characteristics

(VDD= +5V, RL= 5kΩ, CL= 100pF, output amplifier in unity-gain configuration, TA= +25°C, unless otherwise noted.)

200

250

300

350

400

450

500

-60 -20-40 0 20406080100

MAX5122

SUPPLY CURRENT vs. TEMPERATURE

MAX5122/23 toc04

TEMPERATURE (°C)

SUPPLY CURRENT (µA)

(CODE = AAA HEX)

(CODE = 000 HEX)

250

300

400

350

450

500

4.0 4.5 5.0 5.5 6.0

MAX5122

SUPPLY CURRENT vs. SUPPLY VOLTAGE

MAX5122/23 toc05

SUPPLY VOLTAGE (V)

SUPPLY CURRENT (µA)

(CODE = AAA HEX)

(CODE = 000 HEX)

0

0.25

0.50

1.00

0.75

1.25

1.75

1.50

2.00

-60 -20-40 0 20406080100

MAX5122

SHUTDOWN CURRENT vs. TEMPERATURE

MAX5122/23 toc06

TEMPERATURE (°C)

SHUTDOWN CURRENT (µA)

2.490

2.495

2.500

2.505

2.510

-60 -20-40 0 20406080100

MAX5122

FULL-SCALE OUTPUT VOLTAGE

vs. TEMPERATURE

MAX5122/23 toc07

TEMPERATURE (°C)

FULL-SCALE OUTPUT (V)

RL = 5kΩ
C

L

= 100pF

0.1 1 10 100

MAX5122

FULL-SCALE OUTPUT ERROR vs. RESISTIVE LOAD

MAX5122/23 toc08

RL (kΩ)

FULL-SCALE OUTPUT ERROR (LSB)

0.25

-2.00

-1.25

-0.50

CS
5V/div

OUT
1V/div

2µs/div

MAX5122

DYNAMIC RESPONSE RISE TIME

MAX5122/23-09

-0.20

-0.15

-0.10

-0.05

0

0.05

0.10

0.15

0.20

0 1,000 2,000 3,000 4,000 5,000

MAX5122

INTEGRAL NONLINEARITY vs.

DIGITAL INPUT CODE

MAX5122/23 toc01

DIGITAL INPUT CODE

INL (LSB)

-0.20

-0.15

-0.10

-0.05

0

0.05

0.10

0.15

0.20

0 1,000 2,000 3,000 4,000 5,000

MAX5122

DIFFERENTIAL NONLINEARITY vs.

DIGITAL INPUT CODE

MAX5122/23 toc02

DIGITAL INPUT CODE

DNL (LSB)

2.490

2.495

2.500

2.505

2.510

-60 -20 20 60-40 0 40 80 100

MAX5122

REFERENCE VOLTAGE vs. TEMPERATURE

MAX5122/23 toc03

TEMPERATURE (°C)

REFERENCE VOLTAGE (V)