AD7091R-5BCPZ

The AD7091R-5 is a 12-bit, multichannel, ultra low 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 (overline)/GPO₁ (overline) 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 ultra low 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

Key features

• I2C-compatible serial interface supports standard and fast modes
• Ultra low power: 90 μA 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/℃ 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℃ to +125℃