Texas Instruments AFEx39xx/AFEx39xx-Q1 Smart Analog Front Ends

Texas Instruments AFEx39xx/AFEx39xx-Q1 Smart Analog Front Ends (AFEs) are designed for thermoelectric cooling (TEC) control using voltage or PWM output. The AFE639D2 supports an I²C controller to interface with external digital temperature sensors. The AFE639D2 and AFE539A4 support voltage output, and AFE439A2 supports PWM output. The AFEx39xx/AFEx39xx-Q1 supports a comparator channel for fault management. These devices also support Hi-Z power-down mode and Hi-Z output on the DAC channel during power off. These devices have an integrated state machine preprogrammed as a proportional-integral (PI) controller. The AFEx39xx/AFEx39xx-Q1 is an excellent choice for TEC control, temperature control, and dynamic headroom control applications. The Texas Instruments AFEx39xx/AFEx39xx-Q1 integrates advanced features, internal reference, and NVM, enabling this smart AFE for processor-less applications and design reuse.

Features

Integrated proportional-integral (PI) control
- Standalone operation from nonvolatile memory (NVM)
- Programmable proportional and integral gain
- Comparator input for output clamping
- Programmable min, max, and common-mode values for output
- Programmable loop-phase inversion
AFE639D2
- I²C controller for external digital temperature sensor interface
- 12-bit DAC output: 4LSB DNL, 1LSB DNL
AFE539A4
- 10-bit ADC input: 2LSB INL, 1LSB DNL
- 10-bit DAC output: 1LSB INL and DNL
AFE439A2
- 8-bit ADC input: 1LSB INL and DNL
- 7-bit duty-cycle PWM output

Programmable comparator for fault management
High impedance output on DAC channel when V_DD is off
Automatically detects I²C or SPI
- 1.62V V_IH with V_DD = 5.5V
VREF/MODE pin selects between programming and standalone modes
User-programmable NVM
Internal, external, or power supply as reference
Wide operating range
- 1.8V to 5.5V power supply
- Temperature range of –40˚C to +125˚C
16-pin WQFN (3mm × 3mm) tiny package

Applications

Laser
Chemistry and gas analyzer
Mechanically scanning LIDAR

Robot sensing module
Mobile robot sensing module
Seeker front end

Functional Block Diagrams

Block Diagram - Texas Instruments AFEx39xx/AFEx39xx-Q1 Smart Analog Front Ends

Texas Instruments AFEx39xx/AFEx39xx-Q1 Smart Analog Front Ends

Features

Applications

Functional Block Diagrams

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