General Description
The MAX1221/MAX1223/MAX1343 integrate a multichan-
nel, 12-bit, analog-to-digital converter (ADC) and a 12-bit,
digital-to-analog converter (DAC) in a single IC. The
devices also include a temperature sensor and config-
urable general-purpose I/O ports (GPIOs) with a 25MHz
SPITM-/QSPITM-/MICROWIRETM-compatible serial inter-
face. The ADC is available in a 12 or an eight input-chan-
nel version. The DAC outputs settle within 2.0s, and the
ADC has a 225ksps conversion rate.
All devices include an internal reference (2.5V) providing
a well-regulated, low-noise reference for both the ADC
and DAC. Programmable reference modes for the ADC
and DAC allow the use of an internal reference, an exter-
nal reference, or a combination of both. Features such as
an internal 1C accurate temperature sensor, FIFO,
scan modes, programmable internal or external clock
modes, data averaging, and AutoShutdownTM allow users
to minimize both power consumption and processor
requirements. The low glitch energy (4nV
s) and low digi-
tal feedthrough (0.5nV
s) of the integrated DACs make
these devices ideal for digital control of fast-response
closed-loop systems.
The devices are guaranteed to operate with a supply volt-
age from +2.7V to +5.25V. The devices consume 2.5mA
at 225ksps throughput, only 22A at 1ksps throughput,
and under 0.2A in the shutdown mode. The MAX1221/
MAX1343 offer four GPIOs that can be configured as
inputs or outputs.
The MAX1221/MAX1223/MAX1343 are available in 36-pin
thin QFN packages. All devices are specified over the
-40C to +85C temperature range.
Applications
Closed-Loop Controls for Optical Components
and Base Stations
System Supervision and Control
Data-Acquisition Systems
Features
12-Bit, 225ksps ADC
Analog Multiplexer with True-Differential
Track/Hold (T/H)
12 Single-Ended Channels or Six Differential
Channels (Unipolar or Bipolar) (MAX1223)
Eight Single-Ended Channels or Four Differential
Channels (Unipolar or Bipolar)
(MAX1221/MAX1343)
Excellent Accuracy: 0.5 LSB INL, 0.5 LSB DNL
12-Bit, Octal, 2s Settling DAC
(MAX1221/MAX1223)
Ultra-Low Glitch Energy (4nV
s)
Power-Up Options from Zero Scale or Full Scale
Excellent Accuracy: 0.5 LSB INL
Internal Reference or External Single-Ended/
Differential Reference
Internal Reference Voltage 2.5V
Internal 1C Accurate Temperature Sensor
On-Chip FIFO Capable of Storing 16 ADC
Conversion Results and One Temperature Result
On-Chip Channel-Scan Mode and Internal
Data-Averaging Features
Analog Single-Supply Operation
+2.7V to +5.25V
2.7V to AV
DD
Digital Supply
25MHz, SPI/QSPI/MICROWIRE Serial Interface
AutoShutdown Between Conversions
Low-Power ADC
2.5mA at 225ksps
22A at 1ksps
0.2A at Shutdown
Low-Power DAC: 1.5mA
Evaluation Kit Available (Order MAX1258EVKIT)
MAX1221/MAX1223/MAX1343
12-Bit, Multichannel ADCs/DACs with FIFO,
Temperature Sensing, and GPIO Ports
________________________________________________________________ Maxim Integrated Products
1
Ordering Information/Selector Guide
19-4010; Rev 0; 5/06
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.
EVALUATION KIT
AVAILABLE
Pin Configurations appear at end of data sheet.
PART
PIN-PACKAGE
REF
VOLTAGE
(V)
ANALOG
SUPPLY
VOLTAGE (V)
RESOLUTION
BITS**
ADC
CHANNELS
DAC
CHANNELS
GPIOs
PKG
CODE
MAX1221BETX
36 Thin QFN-EP*
2.5
2.7 to 5.25
12
8
8
4
T3666-3
MAX1223BETX
36 Thin QFN-EP*
2.5
2.7 to 5.25
12
12
8
0
T3666-3
MAX1343BETX
36 Thin QFN-EP*
2.5
2.7 to 5.25
12
8
4
4
T3666-3
SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
AutoShutdown is a trademark of Maxim Integrated Products, Inc.
Note: All devices are specified over the -40C to +85C operating temperature range.
*EP = Exposed pad.
**Number of resolution bits refers to both DAC and ADC.
MAX1221/MAX1223/MAX1343
12-Bit, Multichannel ADCs/DACs with FIFO,
Temperature Sensing, and GPIO Ports
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(AV
DD
= DV
DD
= 2.7V to 5.25V, external reference V
REF
= 2.5V, f
CLK
= 3.6MHz (50% duty cycle), T
A
= -40C to +85C, unless other-
wise noted. Typical values are at AV
DD
= DV
DD
= 3V. T
A
= +25C. Outputs are unloaded, unless otherwise noted.)
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.
AV
DD
to AGND .........................................................-0.3V to +6V
DGND to AGND.....................................................-0.3V to +0.3V
DV
DD
to AV
DD
.......................................................-3.0V to +0.3V
Digital Inputs to DGND.............................................-0.3V to +6V
Digital Outputs to DGND .........................-0.3V to (DV
DD
+ 0.3V)
Analog Inputs, Analog Outputs and REF_
to AGND ...............................................-0.3V to (AV
DD
+ 0.3V)
Maximum Current into Any Pin (except AGND, DGND, AV
DD
,
DV
DD
, and OUT_) ...........................................................50mA
Maximum Current into OUT_.............................................100mA
Continuous Power Dissipation (T
A
= +70C)
36-Pin Thin QFN (6mm x 6mm)
(derate 26.3mW/C above +70C) ......................2105.3mW
Operating Temperature Range ...........................-40C to +85C
Storage Temperature Range .............................-60C to +150C
Junction Temperature ......................................................+150C
Lead Temperature (soldering, 10s) .................................+300C
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
ADC
DC ACCURACY (Note 1)
Resolution
12
Bits
Integral Nonlinearity
INL
0.5
1.0
LSB
Differential Nonlinearity
DNL
0.5
1.0
LSB
Offset Error
0.5
4.0
LSB
Gain Error
(Note 2)
0.5
4.0
LSB
Gain Temperature Coefficient
0.8
ppm/C
Channel-to-Channel Offset
0.1
LSB
DYNAMIC SPECIFICATIONS (10kHz sine-wave input, V
IN
= 2.5V
P-P
, 225ksps, f
CLK
= 3.6MHz)
Signal-to-Noise Plus Distortion
SINAD
70
dB
Total Harmonic Distortion
(Up to the Fifth Harmonic)
THD
-76
dBc
Spurious-Free Dynamic Range
SFDR
72
dBc
Intermodulation Distortion
IMD
f
IN1
= 9.9kHz, f
IN2
= 10.2kHz
76
dBc
Full-Linear Bandwidth
SINAD > 70dB
100
kHz
Full-Power Bandwidth
-3dB point
1
MHz
CONVERSION RATE (Note 3)
External reference
0.8
s
Power-Up Time
t
PU
Internal reference (Note 4)
218
C onver si on
cl ock
cycl es
Note: If the package power dissipation is not exceeded, one output at a time may be shorted to AV
DD
, DV
DD
, AGND, or DGND
indefinitely.
MAX1221/MAX1223/MAX1343
12-Bit, Multichannel ADCs/DACs with FIFO,
Temperature Sensing, and GPIO Ports
_______________________________________________________________________________________
3
ELECTRICAL CHARACTERISTICS (continued)
(AV
DD
= DV
DD
= 2.7V to 5.25V, external reference V
REF
= 2.5V, f
CLK
= 3.6MHz (50% duty cycle), T
A
= -40C to +85C, unless other-
wise noted. Typical values are at AV
DD
= DV
DD
= 3V. T
A
= +25C. Outputs are unloaded, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Acquisition Time
t
ACQ
(Note 5)
0.6
s
Internally clocked
5.5
Conversion Time
t
CONV
Externally clocked
3.6
s
External-Clock Frequency
f
CLK
Externally clocked conversion (Note 5)
0.1
3.6
MHz
Duty Cycle
40
60
%
Aperture Delay
30
ns
Aperture Jitter
< 50
ps
ANALOG INPUTS
Unipolar
0
V
REF
Input Voltage Range (Note 6)
Bipolar
-V
REF
/ 2
V
REF
/ 2
V
Input Leakage Current
0.01
1
A
Input Capacitance
24
pF
INTERNAL TEMPERATURE SENSOR
T
A
= +25C
0.7
Measurement Error (Notes 5, 7)
T
A
= T
MIN
to T
MAX
1.0
2.0
C
Temperature Resolution
1/8
C/LSB
INTERNAL REFERENCE
REF1 Output Voltage
(Note 8)
2.482
2.50
2.518
V
REF1 Voltage Temperature
Coefficient
TC
REF
30
ppm/C
REF1 Output Impedance
6.5
k
REF1 Short-Circuit Current
V
REF
= 2.5V
0.39
mA
EXTERNAL REFERENCE
REF1 Input Voltage Range
V
REF1
REF mode 11 (Note 4)
1
AV
DD
+
0.05
V
REF mode 01
1
AV
DD
+
0.05
REF2 Input Voltage Range
(Note 4)
V
REF2
REF mode 11
0
1
V
MAX1221/MAX1223/MAX1343
12-Bit, Multichannel ADCs/DACs with FIFO,
Temperature Sensing, and GPIO Ports
4
_______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(AV
DD
= DV
DD
= 2.7V to 5.25V, external reference V
REF
= 2.5V, f
CLK
= 3.6MHz (50% duty cycle), T
A
= -40C to +85C, unless other-
wise noted. Typical values are at AV
DD
= DV
DD
= 3V. T
A
= +25C. Outputs are unloaded, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
V
REF
= 2.5V, f
SAMPLE
= 225ksps
25
80
REF1 Input Current (Note 9)
I
REF1
Acquisition between conversions
0.01
1
A
V
REF
= 2.5V, f
SAMPLE
= 225ksps
25
80
REF2 Input Current
I
REF2
Acquisition between conversions
0.01
1
A
DAC
DC ACCURACY (Note 10)
Resolution
12
Bits
Integral Nonlinearity
INL
0.5
4
LSB
Differential Nonlinearity
DNL
Guaranteed monotonic
1.0
LSB
Offset Error
V
OS
(Note 8)
3
10
mV
Offset-Error Drift
10
ppm of
FS/C
Gain Error
GE
(Note 8)
5
10
LSB
Gain Temperature Coefficient
8
ppm of
FS/C
DAC OUTPUT
No load
0.02
AV
DD
-
0.02
Output Voltage Range
10k
load to either rail
0.1
AV
DD
-
0.1
V
DC Output Impedance
0.5
Capacitive Load
(Note 11)
1
nF
Resistive Load to AGND
R
L
AV
DD
= 2.7V, V
REF
= 2.5V,
gain error < 1%
2000
MAX1221/MAX1223/MAX1343
12-Bit, Multichannel ADCs/DACs with FIFO,
Temperature Sensing, and GPIO Ports
_______________________________________________________________________________________
5
ELECTRICAL CHARACTERISTICS (continued)
(AV
DD
= DV
DD
= 2.7V to 5.25V, external reference V
REF
= 2.5V, f
CLK
= 3.6MHz (50% duty cycle), T
A
= -40C to +85C, unless other-
wise noted. Typical values are at AV
DD
= DV
DD
= 3V. T
A
= +25C. Outputs are unloaded, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
From power-down mode, AV
DD
= 5V
25
Wake-Up Time (Note 12)
From power-down mode, AV
DD
= 2.7V
21
s
1k
Output Termination
Programmed in power-down mode
1
k
100k
Output Termination
At wake-up or programmed in
power-down mode
100
k
DYNAMIC PERFORMANCE (Notes 5, 13)
Output-Voltage Slew Rate
SR
Positive and negative
3
V/s
Output-Voltage Settling Time
t
S
To 1 LSB, 400 - C00 hex (Note 7)
2
5
s
Digital Feedthrough
Code 0, all digital inputs from 0 to DV
DD
0.5
nV
s
Major Code Transition Glitch
Impulse
Between codes 2047 and 2048
4
nV
s
From V
REF
660
Output Noise (0.1Hz to 50MHz)
Using internal reference
720
V
P-P
From V
REF
260
Output Noise (0.1Hz to 500kHz)
Using internal reference
320
V
P-P
DAC-to-DAC Transition
Crosstalk
0.5
nV
s
INTERNAL REFERENCE
REF1 Output Voltage
2.482
2.50
2.518
V
REF1 Temperature Coefficient
TC
REF
30
ppm/C
REF1 Short-Circuit Current
V
REF
= 2.5V
0.39
mA
EXTERNAL-REFERENCE INPUT
REF1 Input Voltage Range
V
REF1
REF modes 01, 10, and 11 (Note 4)
0.7
AV
DD
V
REF1 Input Impedance
R
REF1
70
100
130
k
DIGITAL INTERFACE
DIGITAL INPUTS (SCLK, DIN,
CS, CNVST, LDAC)
Input-Voltage High
V
IH
DV
DD
= 2.7V to 5.25V
2.4
V
DV
DD
= 3.6V to 5.25V
0.8
Input-Voltage Low
V
IL
DV
DD
= 2.7V to 3.6V
0.6
V
Input Leakage Current
I
L
0.01
10
A
Input Capacitance
C
IN
15
pF
DIGITAL OUTPUT (DOUT) (Note 14)
Output-Voltage Low
V
OL
I
SINK
= 2mA
0.4
V
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