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Temperature Sensor, Four Channel ADC and Quad Voltage Output DAC

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Part Details
  • Four 8-bit DACs
  • Buffered Voltage Output
  • Guaranteed Monotonic by Design Over All Codes
  • 10-Bit Four Channel ADC :
    - DC Input Bandwidth
    - Input Range: 0 V to 2.25 V
  • 10-bit Temperature-to-digital Converter
  • Temperature Range: -40 ºC to +120 ºC
  • Temperature Sensor Accuracy of ±0.5 ºC
  • Supply Range : + 2.7 V to + 5.5 V
  • Power-Down Current 1 µA
  • Internal 2.25 VREF Option
Additional Details
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The ADT7518 combines a 10-bit temperature-to-digital converter, a 10-bit 4-channel ADC, and a quad 8-bit DAC, in a 16-lead QSOP package. The part also includes a band gap temperature sensor and a 10-bit ADC to monitor and digitize the temperature reading to a resolution of 0.25°C.

The ADT7518 operates from a single 2.7 V to 5.5 V supply. The input voltage range on the ADC channels is 0 V to 2.25 V, and the input bandwidth is dc. The reference for the ADC channels is derived internally. The output voltage of the DAC ranges from 0 V to VDD, with an output voltage settling time of 7 ms typical.

The ADT7518 provides two serial interface options: a 4-wire serial interface that is compatible with SPI, QSPI, MICROWIRE, and DSP interface standards, and a 2-wire SMBus/I2C interface. It features a standby mode that is controlled through the serial interface.

The reference for the four DACs is derived either internally or from a reference pin. The outputs of all DACs may be updated simultaneously using the software LDAC function or the external LDAC pin. The ADT7518 incorporates a power-on reset circuit, which ensures that the DAC output powers up to 0 V and remains there until a valid write takes place.

The ADT7518’s wide supply voltage range, low supply current, and SPI-/I2C-compatible interface make it ideal for a variety of applications, including personal computers, office equipment, and domestic appliances.

It is recommended that new designs use the ADT7519 rather than the ADT7518. The ADT7518’s internal and external temp-erature accuracy spec is only valid when not using the internal reference for the on-chip DAC. The ADT7519 does not have this limitation.

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