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| 型號(hào)： | EVAL-AD7450CB |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Differential Input, 1MSPS, 12-Bit ADC in レSO-8 and S0-8 |
| 中文描述： | 差分輸入，1MSPS，12位ADC在レ的SO - 8和S0 - 8 |
| 文件頁(yè)數(shù)： | 1/24頁(yè) |
| 文件大?。?/td> | 432K |
| 代理商： | EVAL-AD7450CB |
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REV. PrJ 27/02/02
Prelimnary 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.
AD7450
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
www.analog.com
Analog Devices, Inc., 2002
Dfferential Input, 1MSPS,
12-Bit ADC in μSO8 and S0-8
FEATURES
Fast Throughput Rate: 1MSPS
Specified for V
DD
of 3 V and 5 V
Low Power at max Throughput Rate:
3 mW typ at 833kSPS with 3 V Supplies
8 mW typ at 1MSPS with 5 V Supplies
Fully Differential Analog Input
Wide Input Bandwidth:
70dB S INAD at 300kHz Input Frequency
Flexible Power/Serial Clock Speed Management
No Pipeline Delays
High S peed S erial Interface - S PI
TM
/QS PI
TM
/
MicroWire
TM
/ DS P Compatible
Pow erdow n Mode: 1μA max
8 Pin μSOIC and SOIC Packages
APPLICATIONS
Transducer Interface
Battery Powered Systems
Data Acquisition Systems
Portable Instrumentation
Motor Control
Communications
G E NE R A L D E SC R IP T ION
T he AD7450 is a 12-bit, high speed, low power, succes-
sive-approximation (SAR) analog-to-digital converter
featuring a fully differential analog input. It operates from
a single 3 V or 5 V power supply and features throughput
rates up to 833kSPS or 1MSPS respectively.
T his part 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. T he reference voltage for the
AD7450 is applied externally to the V
REF
pin and can be
varied from 100 mV to 2.5 V depending on the power
supply and to suit the application. T he value of the refer-
ence 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.
T he conversion process and data acquisition are controlled
using
CS
and the serial clock allowing the device to inter-
face with Microprocessors or DSPs. T he input signals are
sampled on the falling edge of
CS
and the conversion is
also initiated at this point.
F UNC T IONA L BL OC K D IA GR A M
T he SAR architecture of this part ensures that there are
no pipeline delays.
T he AD7450 uses advanced design techniques to achieve
very low power dissipation at high throughput rates.
P R OD UC T H IG H L IG H T S
1.Operation with either 3 V or 5 V power supplies.
2.High T hroughput with L ow Power Consumption.
With a 3V supply, the AD7450 offers 3mW typ power
consumption for 833kSPS throughput.
3.Fully Differential Analog Input.
4.Flexible Power/Serial C lock Speed Management.
T he 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. T his
part also features 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 typ 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
AD7450
VIN+
VIN-
VREF
GND
SCLK
SDATA
CS
VDD
T/H
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