MAX1220_10 Datasheet, PDF (1/43 Pages) Maxim Integrated Products – 12-Bit, Multichannel ADCs/DACs with FIFO, Temperature Sensing, and GPIO Ports

19-3295; Rev 6; 1/10
EVAALVUAAILTAIOBNLEKIT
12-Bit, Multichannel ADCs/DACs with FIFO,
Temperature Sensing, and GPIO Ports
General Description
The MAX1220/MAX1257/MAX1258 integrate a 12-bit,
multichannel, analog-to-digital converter (ADC), and a 12-
bit, octal, digital-to-analog converter (DAC) in a single IC.
These 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 8 and 16 input-channel
versions. The octal DAC outputs settle within 2.0µs and
the ADC has a 225ksps conversion rate.
All devices include an internal reference (2.5V or
4.096V) for both the ADC and DAC. Programmable ref-
erence modes allow the use of an internal reference, an
external 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 power consumption and proces-
sor requirements. The low glitch energy (4nV•s) and low
digital feedthrough (0.5nV•s) of the integrated octal
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 +3.6V (MAX1257) and from +4.75V to
+5.25V (MAX1220/MAX1258). These devices consume
2.5mA at 225ksps throughput, only 22µA at 1ksp through-
put, and under 0.2µA in the shutdown mode. The
MAX1257/MAX1258 feature 12 GPIOs, while the
MAX1220 offers four GPIOs that can be configured as
inputs or outputs.
The MAX1220 is available in a 36-pin thin QFN pack-
age. The MAX1257/MAX1258 are available in 48-pin
thin QFN package. All devices are specified over the
-40°C to +85°C temperature range.
Applications
Controls for Optical Components
Base-Station Control Loops
System Supervision and Control
Data-Acquisition Systems
Features
♦ 12-Bit, 225ksps ADC
Analog Multiplexer with True-Differential
Track/Hold (T/H)
16 Single-Ended Channels or 8 Differential
Channels (Unipolar or Bipolar)
(MAX1257/MAX1258)
Eight Single-Ended Channels or Four Differential
Channels (Unipolar or Bipolar) (MAX1220)
Excellent Accuracy: ±0.5 LSB INL, ±0.5 LSB DNL
♦ 12-Bit, Octal, 2µs Settling DAC
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 or 4.096V
♦ 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
Data-Averaging Features
♦ Analog Single-Supply Operation
+2.7V to +3.6V or +4.75V to +5.25V
♦ Digital Supply: +2.7V to AV_DD
♦ 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
PART
PIN-PACKAGE
REF
VOLTAGE
(V)
ANALOG
SUPPLY
VOLTAGE (V)
MAX1220BETX+ 36 Thin QFN-EP*
4.096
4.75 to 5.25
MAX1257BETM+ 48 Thin QFN-EP*
2.5
2.7 to 3.6
MAX1258BETM+ 48 Thin QFN-EP*
4.096
4.75 to 5.25
Note: All devices are specified over the -40°C to +85°C operating range.
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
**Number of resolution bits refers to both DAC and ADC.
RESOLUTION
BITS**
12
12
12
ADC
CHANNELS
8
16
16
DAC
CHANNELS
GPIOs
8
4
8
12
8
12
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or visit Maxim’s website at www.maxim-ic.com.