PRELIMINARYTECHNICALDATA
3MSPS,10-/12-Bit
a
Preliminary Technical Data
ADCs in 8-Lead TSOT
AD7273/AD7274
FEATURES
FUNCTIONAL BLOCK DIAGRAM
Fast Throughput Rate: 3MSPS
Specified for VDD of 2.35 V to 3.6V
Low Power:
13.5 mW max at 3MSPS with 3V Supplies
Wide Input Bandwidth:
V
GND
DD
70dB SNR at 1MHz Input Frequency
Flexible Power/Serial Clock Speed Management
No Pipeline Delays
High Speed Serial Interface
SPITM/QSPITM/MICROWIRETM/DSPCompatible
Power Down Mode: 1µA max
8-Lead TSOT Package
10-/12-BIT
SUCCESSIVE
APPROXIMATION
ADC
V
V
T/H
IN
REF
8-Lead MSOP Package
SCLK
CONTROL
LOGIC
SDATA
APPLICATIONS
Battery-Powered Systems
Personal Digital Assistants
Medical Instruments
AD7273/AD7274
MobileCommunications
Instrumentation and Control Systems
Data Acquisition Systems
High-SpeedModems
GND
Optical Sensors
GENERAL DESCRIPTION
PRODUCT HIGHLIGHTS
The AD7273/AD7274 are 10-bit and 12-bit, high speed,
low power, successive-approximation ADCs respectively.
The parts operate from a single 2.35V to 3.6 V power
supply and feature throughput rates up to 3 MSPS. The
parts contain a low-noise, wide bandwidth track/hold am-
plifier which can handle input frequencies in excess of
TBD MHz.
1. 3MSPS ADCs in an 8-lead TSOT package.
2. High Throughput with Low Power Consumption.
3. Flexible Power/Serial Clock Speed Management.
The conversion rate is determined by the serial clock
allowing the conversion time to be reduced through the
serial clock speed increase. This allows the average
power consumption to be reduced when a power-down
mode is used while not converting. The AD7273/
AD7274 features a power down mode to maximize
power efficiency at lower throughput rates. Current con-
sumption is 1 µA max when in Power Down mode.
The conversion process and data acquisition are controlled
using CS and the serial clock, allowing the devices to
interface with microprocessors or DSPs. The input signal
is sampled on the falling edge of CS and the conversion is
also initiated at this point. The conversion rate is deter-
mined by the SCLK. There are no pipeline delays associ-
ated with the part.
4. Reference can be driven up to the power supply.
5. No Pipeline Delay.
The AD7273/AD7274 use advanced design techniques to
achieve very low power dissipation at high throughput
rates.
The parts feature a standard successive-approximation
ADC with accurate control of the sampling instant via a
CS input and once-off conversion control.
The reference for the parts is applied externally and can
be in the range of 1.2V to VDD. This allows the widest
dynamic input range to the ADC.
REV. PrB (6/04)
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Analog Devices, Inc., 2004