19-1446; Rev 2; 5/06
+5V/+3V, 12-Bit, Serial, Force/Sense DACs
with 10ppm/°C Internal Reference
General Description
The MAX5122/MAX5123 low-power, 12-bit, voltage-out-
put, digital-to-analog converters (DACs) feature an inter-
nal 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 con-
figurations, remote sensing, and high output drive capa-
bility 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.
♦
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)
Features
MAX5122/MAX5123
Ordering Information
PART
MAX5122AEEE
MAX5122BEEE
MAX5123AEEE
MAX5123BEEE
PIN-
PACKAGE
16 QSOP
16 QSOP
16 QSOP
16 QSOP
INL
(LSB)
±0.5
±1
±1
±2
PKG
CODE
E16-5
E16-5
E16-5
E16-5
Applications
Industrial Process Control
Automatic Test Equipment
Digital Offset and Gain Adjustment
Motion Control
Microprocessor-Controlled Systems
Note:
All devices are specified over the -40°C to +85°C oper-
ating temperature range.
Pin Configuration
TOP VIEW
FB 1
OUT 2
RSTVAL 3
PDL 4
CLR 5
CS 6
DIN 7
SCLK 8
16 V
DD
15 REFADJ
14 REF
MAX5122
MAX5123
13 AGND
12 PD
11 UPO
10 DOUT
9
DGND
SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
QSOP
1
________________________________________________________________
Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
+5V/+3V, 12-Bit, Serial, Force/Sense DACs
with 10ppm/°C Internal Reference
MAX5122/MAX5123
ABSOLUTE MAXIMUM RATINGS
V
DD
to 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, 10s) .................................+300°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.
ELECTRICAL CHARACTERISTICS—MAX5122 (+5V)
(V
DD
= +5V ±10%, AGND = DGND, 33nF capacitor at REFADJ, internal reference, R
L
= 5kΩ, C
L
= 100pF, output amplifier configured
in unity-gain, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
STATIC PERFORMANCE
Resolution
Integral Nonlinearity (Note 1)
Differential Nonlinearity
Offset Error (Note 2)
Gain Error
Full-Scale Temperature
Coefficient (Note 3)
Power-Supply Rejection Ratio
REFERENCE
Output Voltage
Output Voltage Temperature
Coefficient
Reference External Load Regulation
Reference Short-Circuit Current
REFADJ Current
DIGITAL INPUT
Input High Voltage
Input Low Voltage
Input Hysteresis
Input Leakage Current
Input Capacitance
DIGITAL OUTPUTS
Output High Voltage
Output Low Voltage
V
OH
V
OL
I
SOURCE
= 2mA
I
SINK
= 2mA
V
DD
- 0.5
0.13
0.4
V
V
V
IH
V
IL
V
HYS
I
IN
C
IN
V
IN
= 0 or V
DD
-1
200
0.001
8
1
3
0.8
V
V
mV
µA
pF
REFADJ = V
DD
V
REF
TCV
REF
V
OUT
/I
OUT
T
A
= +25°C
MAX5122A
MAX5122B
0
≤
I
OUT
≤
100µA (sourcing)
2.475
2.5
3
10
0.1
4
3.3
7
1
2.525
V
ppm/°C
µV/µA
mA
µA
N
INL
DNL
V
OS
GE
TCV
FS
PSRR
MAX5122A
MAX5123B
4.5V
≤
V
DD
≤
5.5V
MAX5122A
MAX5123B
12
-0.5
-1
-1
-10
-3
-0.2
3
10
20
0.5
1
1
10
3
10
30
250
Bits
LSB
LSB
mV
mV
ppm/°C
µV/V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
2
_______________________________________________________________________________________
+5V/+3V, 12-Bit, Serial, Force/Sense DACs
with 10ppm/°C Internal Reference
ELECTRICAL CHARACTERISTICS—MAX5122 (+5V) (continued)
(V
DD
= +5V ±10%, AGND = DGND, 33nF capacitor at REFADJ, internal reference, R
L
= 5kΩ, C
L
= 100pF, output amplifier configured
in unity-gain, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
DYNAMIC PERFORMANCE
Voltage Output Slew Rate
Output Settling Time
Output Voltage Swing (Note 4)
Current into FB
Time Required to Exit Shutdown
Digital Feedthrough
POWER REQUIREMENTS
Power-Supply Voltage (Note 5)
Power-Supply Current (Note 5)
Power-Supply Current in Shutdown
V
DD
I
DD
I
SHDN
4.5
500
3
5.5
600
20
V
µA
µA
CS
= V
DD
, f
SCLK
= 100kHz,
V
SCLK
= 5Vp-p
-0.1
SR
To ±0.5LSB, V
STEP
= 2.5V
0.6
20
0 to V
DD
0
2
5
0.1
V/µs
µs
V
µA
ms
nV-sec
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX5122/MAX5123
ELECTRICAL CHARACTERISTICS—MAX5123 (+3V)
(V
DD
= +3V ±10%, AGND = DGND, 33nF capacitor at REFADJ, internal reference, R
L
= 5kΩ, C
L
= 100pF, output amplifier connected
in unity-gain, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
STATIC PERFORMANCE
Resolution
Integral Nonlinearity (Note 1)
Differential Nonlinearity
Offset Error (Note 2)
Gain Error
Full-Scale Temperature
Coefficient (Note 3)
Power-Supply Rejection Ratio
REFERENCE
Output Voltage
Output Voltage Temperature
Coefficient
Reference External Load Regulation
Reference Short-Circuit Current
REFADJ Current
DIGITAL INPUT
Input High Voltage
Input Low Voltage
Input Hysteresis
V
IH
V
IL
V
HYS
200
2.2
0.8
V
V
mV
REFADJ = V
DD
V
REF
TCV
REF
V
OUT
/I
OUT
T
A
= +25°C
MAX5123A
MAX5123B
0
≤
I
OUT
≤
100µA (sourcing)
1.237
1.25
3
10
0.1
4
3.3
7
1
1.263
V
ppm/°C
µV/µA
mA
µA
N
INL
DNL
V
OS
GE
TCV
FS
PSRR
MAX5123A
MAX5123B
2.7V
≤
V
DD
≤
3.3V
MAX5123A
MAX5123B
12
-1
-2
-1
-10
-5
-0.2
3
10
20
1
2
1
10
5
10
30
250
Bits
LSB
LSB
mV
mV
ppm/°C
µV/V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
_______________________________________________________________________________________
3
+5V/+3V, 12-Bit, Serial, Force/Sense DACs
with 10ppm/°C Internal Reference
MAX5122/MAX5123
ELECTRICAL CHARACTERISTICS—MAX5123 (+3V) (continued)
(V
DD
= +3V ±10%, AGND = DGND, 33nF capacitor at REFADJ, internal reference, R
L
= 5kΩ, C
L
= 100pF, output amplifier connected
in unity-gain, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
Input Leakage Current
Input Capacitance
DIGITAL OUTPUTS
Output High Voltage
Output Low Voltage
DYNAMIC PERFORMANCE
Voltage Output Slew Rate
Output Settling Time
Output Voltage Swing (Note 4)
Current into FB
Time Required to Exit Shutdown
Digital Feedthrough
POWER REQUIREMENTS
Power-Supply Voltage (Note 5)
Power-Supply Current (Note 5)
Power-Supply Current in Shutdown
V
DD
I
DD
I
SHDN
2.7
500
3
3.6
600
20
V
µA
µA
CS
= V
DD
, f
SCLK
= 100kHz,
V
SCLK
= 3Vp-p
-0.1
SR
To ±0.5LSB, V
STEP
= 1.25V
0.6
20
0 to V
DD
0
2
5
0.1
V/µs
µs
V
µA
ms
nV-sec
V
OH
V
OL
I
SOURCE
= 2mA
I
SINK
= 2mA
V
DD
- 0.5
0.13
0.4
V
V
SYMBOL
I
IN
C
IN
CONDITIONS
V
IN
= 0 or V
DD
MIN
-1
TYP
0.001
8
MAX
1
UNITS
µA
pF
TIMING CHARACTERISTICS—MAX5122 (+5V)
(V
DD
= +5V ±10%, AGND = DGND, 33nF capacitor at REFADJ, internal reference, R
L
= 5kΩ, C
L
= 100pF, output amplifier connected
in unity-gain, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
SCLK Clock Period
SCLK Pulse Width High
SCLK Pulse Width Low
CS
Fall to SCLK Rise Setup Time
SCLK Rise to
CS
Rise Hold Time
SDI Setup Time
SDI Hold Time
SCLK Rise to DOUT Valid
Propagation Delay Time
SCLK Fall to DOUT Valid
Propagation Delay Time
SCLK Rise to
CS
Fall Delay Time
CS
Rise to SCLK Rise Hold Time
CS
Pulse Width High
SYMBOL
t
CP
t
CH
t
CL
t
CSS
t
CSH
t
DS
t
DH
t
DO1
t
DO2
t
CS0
t
CS1
t
CSW
C
LOAD
= 200pF
C
LOAD
= 200pF
10
40
100
CONDITIONS
MIN
100
40
40
40
0
40
0
80
80
TYP
MAX
UNITS
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
4
_______________________________________________________________________________________
+5V/+3V, 12-Bit, Serial, Force/Sense DACs
with 10ppm/°C Internal Reference
TIMING CHARACTERISTICS—MAX5123 (+3V)
(V
DD
= +3V ±10%, AGND = DGND, 33nF capacitor at REFADJ, internal reference, R
L
= 5kΩ, C
L
= 100pF, output amplifier connected
in unity-gain, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
SCLK Clock Period
SCLK Pulse Width High
SCLK Pulse Width Low
CS
Fall to SCLK Rise Setup Time
SCLK Rise to
CS
Rise Hold Time
SDI Setup Time
SDI Hold Time
SCLK Rise to DOUT Valid
Propagation Delay Time
SCLK Fall to DOUT Valid
Propagation Delay Time
SCLK Rise to
CS
Fall Delay Time
CS
Rise to SCLK Rise Hold Time
CS
Pulse Width High
SYMBOL
t
CP
t
CH
t
CL
t
CSS
t
CSH
t
DS
t
DH
t
DO1
t
DO2
t
CS0
t
CS1
t
CSW
C
LOAD
= 200pF
C
LOAD
= 200pF
10
75
150
CONDITIONS
MIN
150
75
75
60
0
60
0
200
200
TYP
MAX
UNITS
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
MAX5122/MAX5123
Note 1:
Accuracy is guaranteed by the following table:
V
DD
(V)
5
3
Accuracy Guaranteed
From Code:
16
33
To Code:
4095
4095
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
and the typical reference voltage.
Note 4:
Accuracy is better than 1.0LSB for V
OUT
= 10mV to (V
DD
- 180mV). Guaranteed by PSR test on end points.
Note 5:
R
LOAD
=
∞
and digital inputs are at either V
DD
or DGND.
_______________________________________________________________________________________
5
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