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參數(shù)資料
| 型號(hào)： | EVAL-AD7453CB2 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Pseudo Differential, 555 kSPS, 12-Bit ADC in an 8-Lead SOT-23 |
| 中文描述： | 偽差分，555 kSPS的，在1 8 12位ADC引腳SOT - 23 |
| 文件頁數(shù)： | 1/20頁 |
| 文件大?。?/td> | 255K |
| 代理商： | EVAL-AD7453CB2 |
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reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties that
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective companies.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
2003 Analog Devices, Inc. All rights reserved.
www.analog.com
AD7453
Pseudo Differential, 555 kSPS,
12-Bit ADC in an 8-Lead SOT-23
FEATURES
Specified for V
DD
of 2.7 V to 5.25 V
Low Power at Max Throughput Rate:
3.3 mW Max at 555 kSPS with V
DD
= 3 V
7.25 mW Max at 555 kSPS with V
DD
= 5 V
Pseudo Differential Analog Input
Wide Input Bandwidth:
70 dB SINAD at 100 kHz Input Frequency
Flexible Power/Serial Clock Speed Management
No Pipeline Delays
High Speed Serial Interface—SPI
/QSPI/
MICROWIRE/DSP Compatible
Power-Down Mode: 1 A Max
8-Lead SOT-23 Package
APPLICATIONS
Transducer Interface
Battery-Powered Systems
Data Acquisition Systems
Portable Instrumentation
Motor Control
Communications
FUNCTIONAL BLOCK DIAGRAM
V
REF
T/H
CONTROL LOGIC
12-BIT
SUCCESSIVE
APPROXIMATION
ADC
GND
SCLK
SDATA
CS
V
DD
AD7453
V
IN+
V
IN–
GENERAL DESCRIPTION
The AD7453 is a 12-bit, high speed, low power, successive
approximation (SAR) analog-to-digital converter that features a
pseudo differential analog input. This part operates from a
single 2.7 V to 5.25 V power supply and features throughput
rates up to 555 kSPS.
The part contains a low noise, wide bandwidth, differential
track-and-hold amplifier (T/H) that can handle input frequen-
cies in excess of 1 MHz. The reference voltage for the AD7453
is applied externally to the V
REF
pin and can range from
100 mV to 3.5 V, depending on the power supply and what
suits the application.
The conversion process and data acquisition are controlled
using
CS
and the serial clock, allowing the device to interface
with microprocessors or DSPs. The input signals are sampled
on the falling edge of
CS
; the conversion is also initiated at
this point.
The SAR architecture of this part ensures that there are no
pipeline delays.
The AD7453 uses advanced design techniques to achieve very
low power dissipation.
PRODUCT HIGHLIGHTS
1. Operation with 2.7 V to 5.25 V Power Supplies.
2. High Throughput with Low Power Consumption.
With a 3 V supply, the AD7453 offers 3.3 mW max power
consumption for a 555 kSPS throughput rate.
3. Pseudo Differential Analog Input.
4. Flexible Power/Serial Clock Speed Management.
The conversion rate is determined by the serial clock, allow-
ing the power to be reduced as the conversion time is reduced
through the serial clock speed increase. This 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 > 10-bits Typically with 500 mV Reference.
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