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.