AD7450BRMZ

Manufacturer Part NumberAD7450BRMZ
Description3V/5V DIFFERENTIAL INPUT 12 BIT SAR IC
ManufacturerAnalog Devices Inc
AD7450BRMZ datasheet
 


Specifications of AD7450BRMZ

Rohs CompliantYESNumber Of Bits12
Sampling Rate (per Second)1MData InterfaceDSP, MICROWIRE™, QSPI™, Serial, SPI™
Number Of Converters1Power Dissipation (max)9.25mW
Voltage Supply SourceSingle SupplyOperating Temperature-40°C ~ 85°C
Mounting TypeSurface MountPackage / Case8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Lead Free Status / RoHS StatusLead free / RoHS CompliantFor Use WithEVAL-AD7450CBZ - BOARD EVALUATION FOR AD7450
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FEATURES
Fast Throughput Rate: 1 MSPS
Specified for V
of 3 V and 5 V
DD
Low Power at Max Throughput Rate:
3.75 mW Max at 833 kSPS with 3 V Supplies
9 mW Max at 1 MSPS with 5 V Supplies
Fully Differential Analog Input
Wide Input Bandwidth:
70 dB SINAD at 300 kHz Input Frequency
Flexible Power/Serial Clock Speed Management
No Pipeline Delays
High-Speed Serial Interface—SPI
TM
MICROWIRE
/DSP Compatible
Power-Down Mode: 1 A Max
8-Lead SOIC and SOIC Packages
APPLICATIONS
Transducer Interface
Battery-Powered Systems
Data Acquisition Systems
Portable Instrumentation
Motor Control
Communications
GENERAL DESCRIPTION
The AD7450 is a 12-bit, high-speed, low power, successive
approximation (SAR) analog-to-digital converter that features a
fully differential analog input. It operates from a single 3 V or 5 V
power supply and features throughput rates up to 833 kSPS or
1 MSPS, respectively.
This part contains a low noise, wide bandwidth, differential track-
and-hold amplifier (T/H) that can handle input frequencies in
excess of 1 MHz with the –3 dB point typically being 20 MHz.
The reference voltage for the AD7450 is applied externally to the
V
pin and can be varied from 100 mV to 3.5 V, depending
REF
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 and data acquisition processes 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, and the conversion is also initiated at
this point.
The SAR architecture of this part ensures that there are no
pipeline delays.
SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corporation.
REV. 0
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. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices.
12-Bit ADC in SOIC-8 and SO-8
V
IN+
V
IN–
V
REF
TM
TM
/QSPI
The AD7450 uses advanced design techniques to achieve 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 3 V
supply, the AD7450 offers 3.75 mW max power consumption
for 833 kSPS 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. 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 > 8 bits typically with 100 mV reference.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
Differential Input, 1 MSPS
AD7450
FUNCTIONAL BLOCK DIAGRAM
V
DD
12-BIT SUCCESSIVE
T/H
APPROXIMATION
ADC
AD7450
CONTROL
LOGIC
GND
www.analog.com
© Analog Devices, Inc., 2002
SCLK
SDATA
CS