19-3295; Rev 7; 2/12
12-Bit, Multichannel ADCs/DACs with FIFO,
Temperature Sensing, and GPIO Ports
07/MAX1258
General Description
Features
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
o 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)
25MHz SPI-/QSPI™-/MICROWIRE -compatible serial
Eight Single-Ended Channels or Four Differential
Channels (Unipolar or Bipolar) (MAX1220)
Excellent Accuracy: 0ꢀ5 ꢁSB ꢂIꢁ, 0ꢀ5 ꢁSB DIꢁ
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.
o 12-Bit, Octal, 2µs Settling DAC
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 1ksps
throughput, 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.
Ultra-ꢁow Glitch Energy (4nV•s)
Power-Up Options from Zero Scale or Full Scale
Excellent Accuracy: 0ꢀ5 ꢁSB ꢂIꢁ
o ꢂnternal Reference or External Single-Ended/
Differential Reference
ꢂnternal Reference Voltage 2ꢀ5V or 4ꢀ096V
o ꢂnternal 1ꢃC Accurate Temperature Sensor
o On-Chip FꢂFO Capable of Storing 16 ADC
Conversion Results and One Temperature Result
o On-Chip Channel-Scan Mode and ꢂnternal
Data-Averaging Features
o Analog Single-Supply Operation
+2ꢀ7V to +3ꢀ6V or +4ꢀ75V to +5ꢀ25V
o Digital Supply: +2ꢀ7V to AVDD
o 25MHz, SPꢂ/QSPꢂ/MꢂCROWꢂRE Serial ꢂnterface
o AutoShutdown Between Conversions
o ꢁow-Power ADC
2ꢀ5mA at 225ksps
22µA at 1ksps
The MAX1220 is available in a 36-pin TQFN package.
The MAX1257/MAX1258 are available in 48-pin TQFN
package. All devices are specified over the
-40°C to +85°C temperature range.
0ꢀ2µA at Shutdown
o ꢁow-Power DAC: 1ꢀ5mA
o Evaluation Kit Available (Order MAX1258EVKꢂT)
Applications
Controls for Optical Components
Base-Station Control Loops
QSPI is a trademark of Motorola, Inc.
MICROWIRE is a registered trademark of National
Semiconductor Corp.
System Supervision and Control
Data-Acquisition Systems
AutoShutdown is a trademark of Maxim Integrated Products, Inc.
Pin Configurations appear at end of data sheetꢀ
Ordering Information/Selector Guide
REF
VOLTAGE
(V)
ANALOG
SUPPLY
VOLTAGE (V)
RESOLUTION
BITS**
ADC
CHANNELS
DAC
CHANNELS
PART
PIN-PACKAGE
GPIOs
MAX1220BETX+
MAX1257BETM+
MAX1258BETM+
36 Thin QFN-EP*
48 Thin QFN-EP*
48 Thin QFN-EP*
4.096
2.5
4.75 to 5.25
2.7 to 3.6
12
12
12
8
8
8
8
4
16
16
12
12
4.096
4.75 to 5.25
Iote: 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.
________________________________________________________________ Maxim ꢂntegrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at wwwꢀmaxim-icꢀcomꢀ
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