ANALOG DEVICES AD7298-1 Service Manual
AD7298-1
10-BIT
SUCCESSIVE
APPROXIMATION
ADC
INPUT
MUX
T/H
V
DD
GND
PD/RST
SCLK
DOUT
DIN
CS
V
DRIVE
V
IN7
V
IN0
CONTROL
LOGIC
SEQUENCER
V
REF
BUFREF
AD7298-1
09321-001
FEATURES
10-bit SAR ADC
8 single-ended inputs
Channel sequencer functionality
Fast throughput of 1 MSPS
Analog input range: 0 V to 2.5 V
Temperature range: −40°C to +125°C
Specified for V
Logic voltage V
Power-down current: <10 µA
Internal 2.5 V reference
Internal power-on reset
High speed serial interface SPI
20-lead LFCSP
of 2.8 V to 3.6 V
DD
= 1.65 V to 3.6 V
DRIVE
8-Channel, 1 MSPS, 10-Bit SAR ADC
FUNCTIONAL BLOCK DIAGRAM
GENERAL DESCRIPTION
The AD7298-1 is a 10-bit, high speed, low power, 8-channel,
successive approximation ADC. The part operates from a single
3.3 V power supply and features throughput rates up to 1 MSPS.
The device contains a low noise, wide bandwidth track-and-hold
amplifier that can handle input frequencies in excess of 30 MHz.
The AD7298-1 offers a programmable sequencer, which enables
the selection of a preprogrammable sequence of channels for
conversion. The device has an on-chip, 2.5 V reference that can
be disabled to allow the use of an external reference.
The device offers a 4-wire serial interface compatible with SPI and
DSP interface standards.
The AD7298-1 uses advanced design techniques to achieve very
low power dissipation at high throughput rates. The part also
offers flexible power/throughput rate management options. The
part is offered in a 20-lead LFCSP package.
Figure 1.
PRODUCT HIGHLIGHTS
1. Ideally Suited to Monitoring System Variables in a Variety
of Systems. This includes telecommunications, and process
and industrial control.
2. High Throughput Rate of 1 MSPS with Low Power
Consumption.
3. Eight Single-Ended Inputs with a Channel Sequencer. A
consecutive sequence of channels can be selected on which
the ADC cycles and converts.
Rev. A
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