19-4010; Rev 1; 12/07
12-Bit, Multichannel ADCs/DACs with FIFO,
Temperature Sensing, and GPIO Ports
2/MAX143
General Description
Features
♦ 12-Bit, 225ksps ADC
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
SPI™-/QSPI™-/MICROWIRE™-compatible serial inter-
face. The ADC is available in a 12 or an eight input-chan-
nel version. The DAC outputs settle within 2.0µs, and the
ADC has a 225ksps conversion rate.
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: ±±05 ꢀSB ꢁIꢀ, ±±05 ꢀSB DIꢀ
♦ 12-Bit, Octal, 2µs Settling DAC
(MAX1221/MAX1223)
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 1ꢀC accurate temperature sensor, FIFO,
scan modes, programmable internal or external clock
modes, data averaging, and AutoShutdown™ 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.
Ultra-ꢀow Glitch Energy (4nV•s)
Power-Up Options from Zero Scale or Full Scale
Excellent Accuracy: ±±05 ꢀSB ꢁIꢀ
♦ ꢁnternal Reference or External Single-Ended/
Differential Reference
ꢁnternal Reference Voltage 205V
♦ ꢁnternal ±1ꢂC Accurate Temperature Sensor
♦ On-Chip FꢁFO Capable of Storing 16 ADC
Conversion Results and One Temperature Result
♦ On-Chip Channel-Scan Mode and ꢁnternal
Data-Averaging Features
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 22µA at 1ksps throughput,
and under 0.2µA in the shutdown mode. The MAX1221/
MAX1343 offer four GPIOs that can be configured as
inputs or outputs.
♦ Analog Single-Supply Operation
+207V to +5025V
♦ 207V to AV
Digital Supply
DD
♦ 25MHz, SPꢁ/QSPꢁ/MꢁCROWꢁRE Serial ꢁnterface
♦ AutoShutdown Between Conversions
♦ ꢀow-Power ADC
205mA at 225ksps
22µA at 1ksps
The MAX1221/MAX1223/MAX1343 are available in 36-pin
thin QFN packages. All devices are specified over the
-40ꢀC to +85ꢀC temperature range.
±02µA at Shutdown
Applications
Closed-Loop Controls for Optical Components
and Base Stations
♦ ꢀow-Power DAC: 105mA
♦ Evaluation Kit Available (Order MAX1258EVKꢁT)
System Supervision and Control
Data-Acquisition Systems
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.
Pin Configurations appear at end of data sheet0
Ordering Information/Selector Guide
REF
VOꢀTAGE
(V)
AIAꢀOG
SUPPꢀY
VOꢀTAGE (V)
RESOꢀUTꢁOI
BꢁTS**
ADC
DAC
PKG
CODE
PART
PꢁI-PACKAGE
GPꢁOs
CHAIIEꢀS CHAIIEꢀS
MAX1221BETX
MAX1223BETX
MAX1343BETX
36 Thin QFN-EP*
36 Thin QFN-EP*
36 Thin QFN-EP*
2.5
2.5
2.5
2.7 to 5.25
2.7 to 5.25
2.7 to 5.25
12
12
12
8
12
8
8
8
4
4
0
4
T3666-3
T3666-3
T3666-3
Iote: All devices are specified over the -40ꢀC to +85ꢀC operating temperature range.
*EP = Exposed pad.
**Number of resolution bits refers to both DAC and ADC.
________________________________________________________________ Maxim ꢁntegrated Products
1
For pricing delivery, and ordering information please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www0maxim-ic0com0
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