AD7457 Datasheet PDF - Analog Devices
| Part Number | AD7457 | |
| Description | 100 kSPS 12-Bit ADC | |
| Manufacturers | Analog Devices | |
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There is a preview and AD7457 download ( pdf file ) link at the bottom of this page. Total 21 Pages | ||
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Low Power, Pseudo Differential, 100 kSPS
12-Bit ADC in an 8-Lead SOT-23
AD7457
FEATURES
Specified for VDD of 2.7 V to 5.25 V
Low power:
0.9 mW max at 100 kSPS with VDD = 3 V
3 mW max at 100 kSPS with VDD = 5 V
Pseudo differential analog input
Wide input bandwidth:
70 dB SINAD at 30 kHz input frequency
Flexible power/serial clock speed management
No pipeline delays
High speed serial interface—SPI®-/QSPI™-/
MICROWIRE™-/DSP-compatible
Automatic power-down mode
8-lead SOT-23 package
APPLICATIONS
Transducer interface
Battery-powered systems
Data acquisition systems
Portable instrumentation
GENERAL DESCRIPTION
The AD7457 is a 12-bit, 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 of up to
100 kSPS.
The part contains a low noise, wide bandwidth, differential
track-and-hold (T/H) amplifier that can handle input frequen-
cies in excess of 1 MHz. The reference voltage for the AD7457 is
applied externally to the VREF pin and can range from 100 mV to
VDD, depending on 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 SAR architecture of this
part ensures that there are no pipeline delays.
The AD7457 uses advanced design techniques to achieve very
low power dissipation.
FUNCTIONAL BLOCK DIAGRAM
VDD
VIN+
VIN–
VREF
12-BIT
T/H SUCCESSIVE
APPROXIMATION
ADC
AD7457
CONTROL LOGIC
SCLK
SDATA
CS
GND
Figure 1.
PRODUCT HIGHLIGHTS
1. Operation with 2.7 V to 5.25 V power supplies.
2. Low power consumption. With a 3 V supply, the AD7457
offers 0.9 mW maximum power consumption for a
100 kSPS throughput rate.
3. Pseudo 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. Automatic power-
down after conversion allows the average power consump-
tion to be reduced.
5. Variable voltage reference input.
6. No pipeline delays.
7. Accurate control of the sampling instant via the CS input
and once-off conversion control.
8. ENOB > 10 bits typically with 500 mV reference.
Rev. 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 that may result from its use.
Specifications subject to change without notice. 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 owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.326.8703 © 2005 Analog Devices, Inc. All rights reserved.
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AD7457
Parameter
POWER REQUIREMENTS
VDD
IDD7, 8
During Conversion6
Normal Mode (Static)
Normal Mode (Operational)
Power-Down
Power Dissipation
Normal Mode (Operational)
Power-Down
Test Conditions/Comments
VDD = 4.75 V to 5.25 V
VDD = 2.7 V to 3.6 V
SCLK on or off
VDD = 4.75 V to 5.25 V
VDD= 2.7 V to 3.6 V
SCLK on or off
VDD = 5 V
VDD = 3 V
VDD = 5 V; SCLK on or off
VDD = 3 V; SCLK on or off
B Version1
2.7/5.25
1.5
1.2
0.5
0.7
0.33
1
3
0.9
5
3
Unit
V min/max
mA max
mA max
mA typ
mA max
mA max
µA max
mW max
mW max
µW max
µW max
1 Temperature range for B version: −40°C to +85°C.
2 See the Terminology section.
3 Analog inputs with slew rates exceeding 27 V/µs (full-scale input sine wave > 3.5 MHz) within the acquisition time may cause an incorrect result to be returned by the
converter.
4 A dc input is applied to VIN– to provide a pseudo ground for VIN+.
5 The AD7457 is functional with a reference input range of 100 mV to VDD.
6 Guaranteed by characterization.
7 See the Power Consumption section.
8 Measured with a full-scale dc input.
Rev. A | Page 4 of 20
Preview 5 Page |
Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for AD7457 electronic component. |
| Information | Total 21 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ AD7457.PDF Datasheet ] | |
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