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What is AD7450A?

This electronic component, produced by the manufacturer "Analog Devices", performs the same function as "(AD7440 / AD7450A) Differential Input / 1 MSPS 10-Bit and 12-Bit ADCs in an 8-Lead SOT-23".


AD7450A Datasheet PDF - Analog Devices

Part Number AD7450A
Description (AD7440 / AD7450A) Differential Input / 1 MSPS 10-Bit and 12-Bit ADCs in an 8-Lead SOT-23
Manufacturers Analog Devices 
Logo Analog Devices Logo 


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PRELIMINARY TECHNICAL DATA
a
Differential Input, 1MSPS,
12- & 10-Bit ADCs in 8-lead SOT-23
Preliminary Technical Data
AD7450A/AD7440
FEATURES
Fast Throughput Rate: 1MSPS
Specified for VDD 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 - SPITM/QSPITM/
MICROWIRETM/ 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 VREF 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
VIN+
VIN-
VREF
T/H
12-BIT SUCCESSIVE
APPROXIMATION
ADC
AD7450A/
AD7440
CONTROL
LOGIC
SCLK
SDATA
+5
GND
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.
REV. PrG 04/03
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.
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
© Analog Devices, Inc., 2003

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AD7450A equivalent
PRELIMINARY TECHNICAL DATA
AD7440-SPECIFICATIONS
AD7450A/AD7440
Parameter
CONVERSION RATE
Conversion Time
Track/Hold Acquisition Time2
Throughput Rate8
Test Conditions/Comments
888ns with an 18MHz SCLK
Sine Wave Input
Step Input
B Version1 Units
16
200
TBD
1
SCLK cycles
ns max
ns max
MSPS max
POWER REQUIREMENTS
VDD
IDD9,10
Normal Mode(Static)
Normal Mode (Operational)
Full Power-Down Mode
Power Dissipation
Normal Mode (Operational)
Full Power-Down
Range: 3 V+20%/-10%;
5 V ± 5%
SCLK On or Off
VDD = 4.75V to 5.25V,
1.38mW typ for 100ksps9
VDD = 2.7 V to 3.6V,
0.53mW typ for 100ksps9
SCLK On or Off
VDD =5 V.
VDD =3 V.
VDD =5 V. SCLK On or Off
VDD =3 V. SCLK On or Off
2.7V/5.25V
0.5
1.8
1.25
1
9
3.75
5
3
Vmin/max
mA typ
mA max
mA max
µA max
mW max
mW max
µW max
µW max
NOTES
1Temperature ranges as follows: B Versions: –40°C to +85°C.
2See ‘Terminology’ section.
3Because the input spans of VIN+ and VIN- are both VREF, and they are 180° out of phase, the differential voltage is 2 x VREF.
4Common Mode Voltage. The input signal can be centered on any choice of dc Common Mode Voltage as long as this value is in the range
specified in Figures tbd and tbd.
5The AD7440 is functional with a reference input from100mV and for VDD = 5V, the reference can range up to 3.5V.
6The AD7440 is functional with a reference input from100mV and for VDD = 3V, the reference range up to 2.2V.
7Sample tested @ +25°C to ensure compliance.
8See ‘Serial Interface Section’.
9See POWER VERSUS THROUGHPUT RATE section.
10Measured with a midscale DC input.
Specifications subject to change without notice.
REV. PrG
–5–


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Featured Datasheets

Part NumberDescriptionMFRS
AD7450The function is Differential Input/ 1MSPS/ 12-Bit ADC in SO-8 and S0-8. Analog DevicesAnalog Devices
AD7450AThe function is (AD7440 / AD7450A) Differential Input / 1 MSPS 10-Bit and 12-Bit ADCs in an 8-Lead SOT-23. Analog DevicesAnalog Devices

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