Rainbow Electronics MAX5121 User Manual

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General Description

The MAX5120/MAX5121 are low-power, 12-bit, voltage­output digital-to-analog converters (DACs) with an inter­nal 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 mid­scale 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 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) 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 Offset
♦ SPI/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 Package
♦ Pin-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

________________________________________________________________

Maxim Integrated Products

1

16
15
14
13
12
11
10

9

1
2
3
4
5
6
7
8

OS V

DD

REFADJ
REF
AGND
PD
UPO
DOUT
DGND

TOP VIEW

MAX5120
MAX5121

QSOP

OUT

RSTVAL

CS

PDL
CLR

DIN

SCLK

19-1428; Rev 0; 2/99

PART

MAX5120AEEE

MAX5120BEEE -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
MAX5121AEEE
MAX5121BEEE±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.

MAX5120/MAX5121

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

2 _______________________________________________________________________________________

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= 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)

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

DD

+ 0.3V)

OS to AGND ...................................(AGND - 4V) 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

MAX5120A

REFADJ = V

DD

4.5V ≤ VDD≤ 5.5V

MAX5120B

MAX5120B

MAX5120A

MAX5120A

Code = FFF hex, TA= +25°C

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

V2.5V

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)

V4.0458 4.095 4.1442V

FS

Full-Scale Voltage

LSB-1 1DNLDifferential Nonlinearity

mV-10 10V

OS

Offset Error (Note 2)

-3 -0.2 3 mVGEGain 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

MAX5120B

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

MAX5120/MAX5121

+3V/+5V, 12-Bit, Serial Voltage-Output DACs

with Internal Reference

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS—MAX5120 (+5V) (continued)

(VDD= +5V ±10%, OS = AGND = DGND = 0V, 33nF capacitor at REFADJ, internal reference, RL= 5kΩ, CL= 100pF, TA= T

MIN

to

T

MAX

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

To ±0.5LSB, V

STEP

= 4V

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-s5Digital Feedthrough

ms2Time Required to Exit Shutdown

kΩ83 121R

OS

OS Input Resistance

µs20Output Settling Time

V0 to V

DD

Output Voltage Swing (Note 4)

UNITSMIN TYP MAXSYMBOLPARAMETER

ELECTRICAL CHARACTERISTICS—MAX5121 (+3V)

(VDD= +3V ±10%, OS = AGND = DGND = 0V, 33nF capacitor at REFADJ, internal reference, RL= 5kΩ, CL= 100pF, TA= T

MIN

to

T

MAX

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

MAX5121A

REFADJ = V

DD

2.7V ≤ VDD≤ 3.3V

MAX5121B

MAX5121B

MAX5121A

MAX5121A

Data = FFF hex, TA= +25°C

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

MAX5121B

3

0 ≤ I

OUT

≤ 100µA (sourcing)

Output Voltage Temperature
Coefficient

V1.25V

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)

V2.0229 2.0475 2.0721V

FS

Full-Scale Voltage

LSB-1 1DNLDifferential Nonlinearity

mV-10 10V

OS

Offset Error (Note 2)

-5 -0.2 5

Reference External Load Regulation

mVGEGain Error

UNITSMIN TYP MAXSYMBOLPARAMETER

-2 2

INLIntegral Nonlinearity (Note 1)

V/µs0.6SRVoltage Output Slew Rate

DYNAMIC PERFORMANCE

POWER REQUIREMENTS

STATIC PERFORMANCE

REFERENCE

DIGITAL INPUT

MAX5120/MAX5121

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

4 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS—MAX5121 (+3V) (continued)

(VDD= +3V ±10%, OS = AGND = DGND = 0V, 33nF capacitor at REFADJ, internal reference, RL= 5kΩ, CL= 100pF, TA= T

MIN

to

T

MAX

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

To ±0.5LSB, V

STEP

= 2V

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-s5Digital Feedthrough

ms2Time Required to Exit Shutdown

kΩ83 121R

OS

OS Input Resistance

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—MAX5120 (+5V)

(VDD= +5V ±10%, OS = AGND = DGND = 0V, 33nF capacitor at REFADJ, internal reference, RL= 5kΩ, CL= 100pF, TA= 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

MAX5120/MAX5121

+3V/+5V, 12-Bit, Serial Voltage-Output DACs

with Internal Reference

_______________________________________________________________________________________ 5

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

∆V

OUT

over the temperature range is

divided by ∆T.

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—MAX5121 (+3V)

(VDD= +3V ±10%, OS = AGND = DGND = 0V, 33nF capacitor at REFADJ, internal reference, RL= 5kΩ, CL= 100pF, TA= 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

105
203

4095
4095

Accuracy Guaranteed

To Code:From Code:

V

DD

(V)

Typical Operating Characteristics

(VDD= +5V (MAX5120), VDD= +3V (MAX5121), RL= 5kΩ, CL= 100pF, OS = AGND, TA = +25°C, unless otherwise noted.)

-0.20

-0.15

-0.10

-0.05

0

0.05

0.10

0.15

0.20

0 1000 2000 3000 4000 5000

MAX5120

INTEGRAL NONLINEARITY vs.

DIGITAL INPUT CODE

MAX5120/21 toc01

DIGITAL INPUT CODE

INL (LSB)

-0.20

-0.15

-0.10

-0.05

0

0.05

0.10

0.15

0.20

0 1000 2000 3000 4000 5000

MAX5120

DIFFERENTIAL NONLINEARITY vs.

DIGITAL INPUT CODE

MAX5120/21 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

MAX5120

REFERENCE VOLTAGE vs. TEMPERATURE

MAX5120/21 toc03

TEMPERATURE (°C)

REFERENCE VOLTAGE (V)

MAX5120/MAX5121

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

6 _______________________________________________________________________________________

Typical Operating Characteristics (continued)

(VDD= +5V (MAX5120), VDD= +3V (MAX5121), RL= 5kΩ, CL= 100pF, OS = AGND, TA = +25°C, unless otherwise noted.)

200

250

300

350

400

450

500

-60 -20-40 0 20406080100

MAX5120

SUPPLY CURRENT vs. TEMPERATURE

MAX5120/21 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

(CODE = AAA HEX)

(CODE = 000 HEX)

6.0

MAX5120

SUPPLY CURRENT vs. SUPPLY VOLTAGE

MAX5120/21 toc05

SUPPLY VOLTAGE (V)

SUPPLY CURRENT (µA)

1.0

1.5

2.0

2.5

3.0

3.5

4.0

-60 -20-40 0 20406080100

MAX5120

SHUTDOWN CURRENT vs. TEMPERATURE

MAX5120/21 toc06

TEMPERATURE (°C)

SHUTDOWN CURRENT (µA)

4.093

4.094

4.095

4.096

4.097

4.098

4.099

-60 -20-40 0 20406080100

MAX5120

FULL-SCALE OUTPUT vs. TEMPERATURE

MAX5120/21 toc07

TEMPERATURE (°C)

FULL-SCALE OUTPUT (V)

RL = 5kΩ
C

L

= 100pF

CS
5V/div

OUT
1V/div

5µs/div

MAX5120

DYNAMIC RESPONSE FALL TIME

MAX5120/21-10

0.1 1 10 100

MAX5120

FULL-SCALE ERROR vs. RESISTIVE LOAD

MAX5120/21 toc08

RL (kΩ)

FULL-SCALE ERROR (LSB)

0.50

-1.50

-1.25

-1.00

-0.75

-0.50

-0.25

0

0.25

CS
5V/div

OUT
1V/div

5µs/div

MAX5120

DYNAMIC RESPONSE RISE TIME

MAX5120/21-09

SCLK
2V/div

OUT
1mV/div
AC COUPLED

2µs/div

MAX5120

DIGITAL FEEDTHROUGH (SCLK, OUT)

MAX5120/21-11

CS
2V/div

OUT
100mV/div
AC COUPLED

5µs/div

MAX5120

MAJOR CARRY TRANSITION

MAX5120/21-12