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參數(shù)資料
| 型號： | AD745 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Ultralow Noise, High Speed, BiFET Op Amp |
| 中文描述： | 超低噪聲，高速，BiFET運算放大器 |
| 文件頁數(shù)： | 1/20頁 |
| 文件大小： | 411K |
| 代理商： | AD745 |
REV. PrD 5 March 03
Preliminary Technical Data
PRELIMINARY TECHNICAL DATA
Differential Input, 555kSPS,
12-Bit ADC in an 8-lead SOT-23
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.
AD7452
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., 200
3
a
FEATURES
Specified for V
DD
of 3 V and 5 V
Low Power at max Throughput Rate:
7 mW typ at 555kSPS with 3 V Supplies
3 mW typ at 555kSPS with 5 V Supplies
Fully Differential Analog Input
Wide Input Bandwidth:
70dB SINAD at 100kHz 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 AD7452 is a 12-bit, low power, successive-approxi-
mation (SAR) analog-to-digital converter that features a
fully differential analog input. This part operates from a
single 3 V or 5 V power supply and features throughput
rates up to 555kSPS.
The 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. 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 AD7452 uses advanced design techniques to achieve
very low power dissipation.
PRODUCT HIGHLIGHTS
1.Operation with either 3 V or 5 V power supplies.
2.Low Power Consumption.
With a 3V supply, the AD7452 offers
3 mW typ power consumption for 555kSPS
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 for a 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
AD7452
VIN+
VIN-
VREF
GND
SCLK
SDATA
T/H
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