1 Features

? Current-source DAC:

– 1-LSB DNL

– Two ranges: 300 mA and 220 mA

– 770-mV headroom

? Dual voltage-output DACs:

– 1-LSB DNL

– Gains of 1 ×, 1.5 ×, 2 ×, 3 ×, and 4 ×

? ADC input on channel 1

? Programmable comparator mode on channel 1

? High-impedance output when VDD is off

? High-impedance and resistive pulldown powerdown

modes

? 50-MHz SPI-compatible interface

? Automatically detects I2C or SPI

– 1.62-V VIH with VDD = 5.5 V

? General-purpose input/output (GPIO) configurable

as multiple functions

? Predefined waveform generation: sine, cosine,

triangular, sawtooth

? User-programmable nonvolatile memory (NVM)

? Internal or power-supply as reference

? Wide operating range:

– Power supply: 3 V to 5.5 V

– Temperature: –40?C to +125?C

2 Applications

? Optical module

? Laser

3 Description

The 10-bit AFE532A3W and the 8-bit AFE432A3W

(AFEx32A3W) are a three-channel, buffered voltageoutput,

current-output, and ADC-input smart analog

front end (AFE). The AFEx32A3W devices support

a current source that can be used for linear

control of laser diodes and miniature motors. These

devices support Hi-Z power-down mode and Hi-

Z output during power-off conditions for voltage

output. Channel 1 can be configured as an ADC,

voltage-output DAC or a comparator. The voltageoutput

DACs provide a force-sense option for use

as a programmable comparator and current sink.

The multifunction GPIO, function generation, and

programmable nonvolatile memory (NVM) enable

these smart AFEs for processor-less applications and

design reuse. These devices automatically detect SPI

or I2C interfaces and contain an internal reference.

The AFEx32A3W feature set combined with the tiny

package and low power make these smart AFEs an

excellent choice for applications such as laser diode

power control and electro-absorption modulated laser

(EML) control in passive optical network (PON) and

other industrial laser applications.