Texas Instruments AFE 32A3W Series Manual

AFEx32A3W 10-Bit and 8-Bit, Three-Channel Voltage-Output, Current-Output, and

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 power-
down modes
• 50-MHz SPI-compatible interface
• Automatically detects I
– 1.62-V V with V
IH DD
• 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
LOW
Figure 3-1. Electro-absorption Modulated Laser (EML) Control Using AFEx32A3W
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
ADC-Input Smart AFE With I
2
C or SPI
= 5.5 V
1.5 F
100 nF
¡
CAP
LDO
NVM
BUFFER
SDA/SCLK
A0/SDI
SCL/SYNC
HIGH
BUFFER
GPIO/SDO
BUFFER
Output Configuration
Logic
AGND
2
C or SPI

3 Description

The 10-bit AFE532A3W and the 8-bit AFE432A3W
(AFEx32A3W) are a three-channel, buffered voltage-
output, 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 voltage-
output 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
2
or I C 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.
Device Information
PART NUMBER
AFE532A3W YBH (DSBGA, 16)
AFE432A3W YBH (DSBGA, 16)
(1) For more information see
(2) The package size (length × width) is a nominal value and
includes pins, where applicable.
V
DD
V PV
DD DD
Internal
Reference
EML
IDAC
10 k
10 k
V
¢
SS
VOUT –
EAM
+
VDD
10 k
£
ADC
FB1
AFEx32A3W
PGND
AFE532A3W, AFE432A3W
SLASFB2 – NOVEMBER 2023
(1)
PACKAGE PACKAGE SIZE
1.72 mm × 1.72 mm
1.72 mm × 1.72 mm
Section 11.
V
DD
(2)