19-4009; Rev 1; 3/08
10-Bit, Multichannel ADCs/DACs with FIFO,
Temperature Sensing, and GPIO Ports
The MAX1021/MAX1043 integrate a multichannel, 10-bit,
analog-to-digital converter (ADC) and a 10-bit, digital-to-
analog converter (DAC) in a single IC. The devices also
include a temperature sensor and configurable general-
purpose I/O ports (GPIOs) with a 25MHz SPI™-/QSPI™-/
MICROWIRE™-compatible serial interface. The ADC is
available in an eight input-channel version. The DAC out-
puts settle within 2.0µs, and the ADC has a 225ksps con-
All devices include an internal reference (2.5V) to provide
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 ±1°C 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
The devices are guaranteed to operate with a supply volt-
age from +2.7V to +5.25V. They consume 2.5mA at
225ksps throughput, only 22µA at 1ksps throughput, and
under 0.2µA in the shutdown mode. The MAX1021/
MAX1043 offer four GPIOs that can be configured as
inputs or outputs.
The MAX1021/MAX1043 are available in 36-pin thin QFN
packages. These devices are specified over the -40°C to
+85°C temperature range.
Closed-Loop Controls for Optical Components
and Base Stations
System Supervision and Control
♦ 10-Bit, 225ksps ADC
Analog Multiplexer with True-Differential
Eight Single-Ended Channels or Four
Channels (Unipolar or Bipolar)
Excellent Accuracy: ±0.5 LSB INL, ±0.5 LSB
DNL, No Missing Codes Over Temperature
♦ 10-Bit, Octal, 2µs Settling DAC (MAX1021)
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/
Internal Reference Voltage (2.5V)
♦ Internal ±1°C Accurate Temperature Sensor
♦ On-Chip FIFO Capable of Storing 16 ADC
Conversion Results and One Temperature Result
♦ On-Chip Channel-Scan Mode and Internal
♦ Analog Single-Supply Operation
+2.7V to +5.25V
♦ Digital Supply: +2.7V to AVDD
♦ 25MHz, SPI/QSPI/MICROWIRE Serial Interface
♦ AutoShutdown Between Conversions
♦ Low-Power ADC
2.5mA at 225ksps
22µA at 1ksps
0.2µA at Shutdown
♦ Low-Power DAC: 1.5mA
♦ Evaluation Kit Available (Order MAX1258EVKIT)
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 sheet.
Ordering Information/Selector Guide
ANALOG SUPPLY RESOLUTION
VOLTAGE (V) VOLTAGE (V)
MAX1021BETX 36 Thin QFN-EP*
2.7 to 5.25
MAX1043BETX 36 Thin QFN-EP*
2.7 to 5.25
Note: All devices are specified over the -40°C to +85°C operating temperature range.
*EP = Exposed pad.
**Number of resolution bits refers to both DAC and ADC.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
Free Datasheet http://www.datasheet4u.com/