4-Channel, IC, Ultralow Power 12-Bit ADC in 20-Lead LFCSP/TSSOP

The AD7091R-5 is a 12-bit, multichannel, ultralow power, successive approximation analog-to-digital converter (ADC). The AD7091R-5 operates from a single 2.7 V to 5.25 V power supply and typically consumes only 24 µA at a 3 V supply in fast mode.

The AD7091R-5 provides a 2-wire serial interface compatible with I2C interfaces. The conversion process can be controlled by a sample mode via the CONVST pin, an autocycle mode selected through software control, or a command mode in which conversions occur across I2C write operations.

The device contains a wide bandwidth track-and-hold amplifier that can handle input frequencies up to 1.5 MHz. The AD7091R-5 also features an on-chip conversion clock, an on-chip accurate 2.5 V reference, and a programmable out-of-bounds user alert function.

The AD7091R-5 offers four single-ended analog input channels with a channel sequencer that allows a preprogrammed selection of channels to be converted sequentially.

The AD7091R-5 uses advanced design techniques to achieve ultralow power dissipation without compromising performance. It also features flexible power management options. An on-chip configuration register allows the user to set up different operating conditions. These include power management, alert functionality, busy indication, channel sequencing, and general-purpose output pins. The MUXOUT and ADCIN pins allow signal conditioning of the multiplexer output before acquisition by the ADC.

Applications

* Battery powered systems

* Personal digital assistants

* Medical instruments

* Mobile communications

* Instrumentation and control systems

* Data acquisition systems

* Optical sensors

* Diagnostic/monitoring functions

* I2C-compatible serial interface supports standard and fast modes

* Ultralow power: 90 μW typical at 3 V in fast mode

* Specified for VDD of 2.7 V to 5.25 V

* On-chip accurate 2.5 V reference, 5 ppm/°C typical drift

* 4 single-ended analog input channels

* ALERT function

* BUSY function

* Autocycle mode

* Wide input bandwidth

* 68 dB signal-to-noise ratio (SNR) typical at input frequency of 1 kHz

* Flexible power/throughput rate management

* No pipeline delays

* Power-down mode

* 550 nA typical at VDD = 5.25 V

* 435 nA typical at VDD = 3 V

* 20-lead LFCSP and TSSOP packages

* Temperature range: −40°C to +125°C