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參數資料
| 型號： | AD7440 |
| 英文描述： | AD7450A/AD7440: Differential Input. 1MSPS. 12-Bit ADC in 8-lead SOT-23 Preliminary Data Sheet (Rev. PrF. 3/03) |
| 中文描述： | AD7450A/AD7440：差分輸入。 1MSPS。 12位ADC，采用8引腳SOT - 23的初步數據（牧師脈沖重復頻率。3 / 03） |
| 文件頁數： | 1/24頁 |
| 文件大?。?/td> | 914K |
| 代理商： | AD7440 |
REV. PrF 10 March 03
Preliminary Technical Data
PRELIMINARY TECHNICAL DATA
a
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 rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
AD7450A/AD7440
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
Analog Devices, Inc., 2003
Differential Input, 1MSPS,
12- & 10-Bit ADCs in 8-lead SOT-23
FEATURES
Fast Throughput Rate: 1MSPS
Specified for V
DD
of 3 V and 5 V
Low Power at max Throughput Rate:
3.75 mW typ at 1MSPS with 3 V Supplies
9 mW typ at 1MSPS with 5 V Supplies
Fully Differential Analog Input
Wide Input Bandwidth:
70dB SINAD at 200kHz Input Frequency
Flexible Power/Serial Clock Speed Management
No Pipeline Delays
High Speed Serial Interface - SPI
TM
/QSPI
TM
/
MICROWIRE
TM
/ DSP Compatible
Power-Down Mode: 1μA max
8 Lead SOT-23 and MSOP Packages
APPLICATIONS
Transducer Interface
Battery Powered Systems
Data Acquisition Systems
Portable Instrumentation
Motor Control
Communications
GENERAL DESCRIPTION
The AD7450A/AD7440 are respectively 12- and 10-bit,
high speed, low power, successive-approximation (SAR)
analog-to-digital converters that feature a fully differential
analog input. These parts operate from a single 3 V or 5 V
power supply and feature throughput rates up to 1MSPS.
The parts contains a low-noise, wide bandwidth, differen-
tial track and hold amplifier (T/H) which can handle
input frequencies in excess of 1MHz with the -3dB point
being 20MHz typically. The reference voltage is applied
externally to the V
REF
pin and can be varied from 100 mV
to 3.5 V depending on the power supply and what suits the
application. The value of the reference voltage determines
the common mode voltage range of the part. With this
truly differential input structure and variable reference
input, the user can select a variety of input ranges and bias
points.
The conversion process and data acquisition are controlled
using
CS
and the serial clock allowing the device to inter-
face with Microprocessors or DSPs. The input signals are
sampled on the falling edge of
CS
and the conversion is
also initiated at this point.
FUNCTIONAL BLOCK DIAGRAM
VDD
The SAR architecture of these parts ensures that there are
no pipeline delays.
The AD7450A and the AD7440 use advanced design tech-
niques to achieve very low power dissipation at high
throughput rates.
PRODUCT HIGHLIGHTS
1.Operation with either 3 V or 5 V power supplies.
2.High Throughput with Low Power Consumption.
With a 3V supply, the AD7450A/AD7440 offer
3.75mW typ power consumption for 1MSPS throughput.
3.Fully Differential Analog Input.
4.Flexible Power/Serial Clock Speed Management.
The conversion rate is determined by the serial clock,
allowing the power to be reduced as the conversion time
is reduced through the serial clock speed increase. These
parts also feature a shutdown mode to maximize power
efficiency at lower throughput rates.
5.Variable Voltage Reference Input.
6.No Pipeline Delay.
7.Accurate control of the sampling instant via a
CS
input
and once off conversion control.
8. ENOB > 8 bits typically with 100mV reference.
MICROWIRE is a trademark of National Semiconductor Corporation.
SPI and QSPI are trademarks of Motorola, Inc.
12-BIT SUCCESSIVE
APPROXIMATION
ADC
CONTROL
LOGIC
AD7450A/
AD7440
VIN+
VIN-
VREF
GND
SCLK
SDATA
T/H
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| AD7450A | AD7450A/AD7440: Differential Input. 1MSPS. 12-Bit ADC in 8-lead SOT-23 Preliminary Data Sheet (Rev. PrF. 3/03) |
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