AD7091R-2BCPZ

The AD7091R-2/AD7091R-4/AD7091R-8 family is a multichannel 12-bit, ultralow power, successive approximation analog-to-digital converter (ADC) that is available in two, four, or eight analog input channel options. The AD7091R-2/AD7091R-4/ AD7091R-8 operate from a single 2.7 V to 5.25 V power supply and are capable of achieving a sampling rate of 1 MSPS. The AD7091R-2/AD7091R-4/AD7091R-8 family offers up to eight single-ended analog input channels with a channel sequencer that allows a preprogrammed selection of channels to be converted sequentially. The AD7091R-2/AD7091R-4/ AD7091R-8 also feature an on-chip conversion clock, an on-chip accurate 2.5 V reference, and a high speed serial interface. The AD7091R-2/AD7091R-4/AD7091R-8 have a serial port interface (SPI) that allows data to be read after the conversion while achieving a 1 MSPS throughput rate. The conversion process and data acquisition are controlled using the CONVST pin. The AD7091R-2/AD7091R-4/AD7091R-8 use advanced design techniques to achieve ultralow power dissipation at high throughput rates. They also feature 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 prior to 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

• Ultralow system power
• Flexible power/throughput rate management
• Normal mode 1.4 mW at 1 MSPS
• Power-down mode 550 nA typical at VDD = 5.25 V
• 435 nA typical at VDD = 3 V
• Programmable ALERT interrupt pin (4-/8-channel models)
• High performance
• 1 MSPS throughput with no latency/pipeline delay
• SNR: 70 dB typical at 10 kHz input frequency
• THD: −80 dB typical at 10 kHz input frequency
• INL: ±0.7 LSB typical, ±1.0 LSB maximum
• Small system footprint
• On-chip accurate 2.5 V reference, 5 ppm/°C typical drift
• MUXOUT/ADCIN to allow single buffer amplifier
• Daisy-chain mode
• 16-lead, 20-lead, and 24-lead 4 mm × 4 mm LFCSP packages
• 16-lead, 20-lead, and 24-lead TSSOP packages
• Easy to use
• SPI/QSPI/MICROWIRE/DSP compatible digital interface
• Integrated programmable channel sequencer
• BUSY indication available (4-/8-channel models)
• Built in features for control and monitoring applications
• GPOx pins available (4-/8-channel models)
• Wide operating range
• Temperature range: -40°C to +125°C
• Specified for VDD of 2.7 V to 5.25 V