AD7091R-2BRUZ Datasheet, PDF (1/41 Pages) List of Unclassifed Manufacturers – 2-/4-/8-Channel, 1 MSPS, Ultralow Power, 12-Bit ADC in 16-/20-/24-Lead TSSOP

Data Sheet
2-/4-/8-Channel, 1 MSPS, Ultralow Power,
12-Bit ADC in 16-/20-/24-Lead TSSOP
AD7091R-2/AD7091R-4/AD7091R-8
FEATURES
Fast throughput rate: 1 MSPS
Specified for VDD of 2.7 V to 5.25 V
Ultralow power: 467 µA typical at 3 V and 1 MSPS
On-chip accurate 2.5 V reference, 5 ppm/°C typical drift
2, 4, and 8 single-ended analog input channels
Programmable channel sequencer
ALERT function available in 4- and 8-channel versions
BUSY indication available in 4- and 8-channel versions
GPOx pins available in 4- and 8-channel versions
Wide input bandwidth
70 dB signal-to-noise ratio (SNR) typical at input
frequency of 10 kHz
Flexible power/throughput rate management
No pipeline delays
High speed serial interface
SPI/QSPI™/MICROWIRE™/DSP compatible
Daisy-chain mode
Power-down mode
550 nA typical at VDD = 5.25 V
435 nA typical at VDD = 3 V
16-lead, 20-lead, and 24-lead 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-2/AD7091R-4/AD7091R-8 family is a multichannel
12-bit, ultralow power, successive approximation analog-to-
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 is capable
of achieving a sampling rate of 1 MSPS. The AD7091R-2/
AD7091R-4/AD7091R-8 contain a wide bandwidth track-and-
hold amplifier that can operate at input frequencies in excess of
1.5 MHz. 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.
Rev. 0
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FUNCTIONAL BLOCK DIAGRAM
MUX_OUT ADC_IN V_DD
REF_IN/
REF_OUT
REGCAP
V_IN0
V_IN1
V_IN2
V_IN3
V_IN4
V_IN5
V_IN6
V_IN7
I/P
MUX
CHANNEL
SEQUENCER
2.5V
VREF
T/H
12-BIT
SUCCESSIVE
APPROXIMATION
ADC
ON-CHIP
OSC
CONTROL LOGIC
AND REGISTERS
AD7091R-8
V_DRIVE
RESET
CONVST
SDO
SDI
SCLK
CS
GND
ALERT/
BUSY/
GPO₀
Figure 1.
GPO₁
GND
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 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.
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