1.6 V, Micropower 12-/10-/8-Bit ADCs
AD7466/AD7467/AD7468
FEATURES FUNCTIONAL BLOCK DIAGRAM
V
DD
Specified for V of 1.6 V to 3.6 V
DD
Low power:
0.62 mW typical at 100 kSPS with 3 V supplies
12-/10-/8-BIT
SUCCESSIVE
0.48 mW typical at 50 kSPS with 3.6 V supplies
V T/H
IN
APPROXIMATION
ADC
0.12 mW typical at 100 kSPS with 1.6 V supplies
Fast throughput rate: 200 kSPS
Wide input bandwidth:
SCLK
71 dB SNR at 30 kHz input frequency
CONTROL
SDATA
Flexible power/serial clock speed management
LOGIC
CS
No pipeline delays
High speed serial interface:
AD7466/AD7467/AD7468
SPI/QSPI/MICROWIRE/DSP compatible
GND
Automatic power-down
Power-down mode: 8 nA typical
Figure 1.
6-lead SOT-23 package
8-lead MSOP package
APPLICATIONS
Battery-powered systems
Medical instruments
Remote data acquisition
Isolated data acquisition
GENERAL DESCRIPTION PRODUCT HIGHLIGHTS
1
The AD7466/AD7467/AD7468 are 12-/10-/8-bit, high speed, 1. Specified for supply voltages of 1.6 V to 3.6 V.
low power, successive approximation analog-to-digital
2. 12-, 10-, and 8-bit ADCs in SOT-23 and MSOP packages.
converters (ADCs), respectively. The parts operate from a single
3. High throughput rate with low power consumption.
1.6 V to 3.6 V power supply and feature throughput rates up to
Power consumption in normal mode of operation at
200 kSPS with low power dissipation. The parts contain a low
100 kSPS and 3 V is 0.9 mW maximum.
noise, wide bandwidth track-and-hold amplifier, which can
handle input frequencies in excess of 3 MHz. 4. Flexible power/serial clock speed management.
The conversion rate is determined by the serial clock,
The conversion process and data acquisition are controlled
allowing the conversion time to be reduced through
using CS and the serial clock, allowing the devices to interface
increases in the serial clock speed. Automatic power-down
with microprocessors or DSPs. The input signal is sampled on
after conversion allows the average power consumption to
the falling edge of CS, and the conversion is also initiated at this
be reduced when in power-down. Current consumption is
point. There are no pipeline delays associated with the part.
0.1 A maximum and 8 nA typically when in power-down.
The reference for the part is taken internally from V . This
DD
5. Reference derived from the power supply.
allows the widest dynamic input range to the ADC. Thus, the
6. No pipeline delay.
analog input range for the part is 0 V to V . The conversion
DD
rate is determined by the SCLK.
7. The part features a standard successive approximation
ADC with accurate control of conversions via a CS input.
1
Protected by U.S. Patent No. 6,681,332.
Rev. C
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
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rights of third parties that may result from its use. Specifications subject to change without notice. No
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Trademarks and registered trademarks are the property of their respective owners.
02643-001AD7466/AD7467/AD7468
TABLE OF CONTENTS
Features .............................................................................................. 1 Power Requirement Curves ...................................................... 13
Applications....................................................................................... 1 Terminology.................................................................................... 16
Functional Block Diagram .............................................................. 1 Theory of Operation ...................................................................... 17
General Description ......................................................................... 1 Circuit Information.................................................................... 17
Product Highlights ........................................................................... 1 Converter Operation.................................................................. 17
Revision History ............................................................................... 2 ADC Transfer Function............................................................. 17
Specifications..................................................................................... 3 Typical Connection Diagram ................................................... 17
AD7466.......................................................................................... 3 Analog Input ............................................................................... 18
AD7467.......................................................................................... 5 Digital Inputs .............................................................................. 18
AD7468.......................................................................................... 7 Normal Mode.............................................................................. 19
Timing Specifications .................................................................. 9 Power Consumption .................................................................. 20
Timing Examples........................................................................ 10 Serial Interface ................................................................................ 22
Absolute Maximum Ratings.......................................................... 11 Microprocessor Interfacing....................................................... 23
ESD Caution................................................................................ 11 Application Hints ........................................................................... 25
Pin Configurations and Function Descriptions ......................... 12 Grounding and Layout .............................................................. 25
Typical Performance Characteristics ........................................... 13 Evaluating the Performance of the AD7466 and AD7467.... 25
Dynamic Performance Curves ................................................. 13 Outline Dimensions....................................................................... 26
DC Accuracy Curves ................................................................. 13 Ordering Guide .......................................................................... 27
REVISION HISTORY
5/07Rev. B to Rev. C
Deleted Figure 3.............................................................................. 10
Updated Outline Dimensions ....................................................... 26
Changes to Ordering Guide .......................................................... 27
4/05Rev. A to Rev. B
Moved Terminology Section......................................................... 16
Changes to Ordering Guide .......................................................... 27
11/04Rev. 0 to Rev. A
Updated Format..................................................................Universal
Changes to General Description .................................................... 1
Added Patent Number ..................................................................... 1
Updated Outline Dimensions ....................................................... 26
Changes to Ordering Guide .......................................................... 27
5/03Revision 0: Initial Version
Rev. C | Page 2 of 28