AD7091R-5_17 Datasheet, PDF (1/35 Pages) Analog Devices – 4-Channel, I 2 C, Ultralow Power 12-Bit ADC in 20-Lead LFCSP/TSSOP

Data Sheet
4-Channel, I²C, Ultralow Power,
12-Bit ADC in 20-Lead LFCSP/TSSOP
AD7091R-5
FEATURES
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
APPLICATIONS
Battery-powered systems
Personal digital assistants
Medical instruments
Mobile communications
Instrumentation and control systems
Data acquisition systems
Optical sensors
Diagnostic/monitoring functions
GENERAL DESCRIPTION
The AD7091R-5 is a 12-bit, multichannel, ultralow power, succes-
sive 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/GPO1 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.
FUNCTIONAL BLOCK DIAGRAM
REF_IN/
MUX_OUT ADC_IN V_DD REF_{OUT REGCAP}
V_IN0
V_IN1
V_IN2
V_IN3
INPUT
MUX
CHANNEL
SEQUENCER
2.5V
VREF
12-BIT
T/H
SUCCESSIVE
APPROXIMATION
ADC
ON-CHIP
OSC
CONTROL
LOGIC
I²C INTERFACE
AD7091R-5
RESET
CONVST/GPO₁
SDA
SCL
AS₀
AS₁
V_DRIVE
GND
ALERT/BUSY/ GPO₂ GND
GPO₀
Figure 1.
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.
Rev. 0
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