AD7477SRT Analog Devices, AD7477SRT Datasheet

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AD7477SRT

Manufacturer Part Number
AD7477SRT
Description
AD7477SRT1 MSPS, 12-/10-/8-Bit ADCs in 6-Lead SOT-23
Manufacturer
Analog Devices
Datasheet
GENERAL DESCRIPTION
The AD7476/AD7477/AD7478 are, respectively, 12-bit, 10-bit,
and 8-bit, high speed, low power, successive-approximation
ADCs. The parts operate from a single 2.35 V to 5.25 V power
supply and feature throughput rates up to 1 MSPS. The parts
contain a low noise, wide bandwidth track-and-hold amplifier
that can handle input frequencies in excess of 6 MHz.
The conversion process and data acquisition are controlled
using CS and the serial clock, allowing the devices to interface
with microprocessors or DSPs. The input signal is sampled on
the falling edge of CS and the conversion is also initiated at this
point. There are no pipeline delays associated with the part.
The AD7476/AD7477/AD7478 use advanced design techniques
to achieve very low power dissipation at high throughput rates.
The reference for the part is taken internally from V
allows the widest dynamic input range to the ADC. Thus the
analog input range for the part is 0 V to V
rate is determined by the SCLK.
*Protected by U.S.Patent No. 6,681,332.
REV. D
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. Trademarks and
registered trademarks are the property of their respective owners.
FEATURES
Fast Throughput Rate: 1 MSPS
Specified for V
Low Power:
Wide Input Bandwidth:
Flexible Power/Serial Clock Speed Management
No Pipeline Delays
High Speed Serial Interface
Standby Mode: 1 A Max
6-Lead SOT-23 Package
APPLICATIONS
Battery-Powered Systems
Instrumentation and Control Systems
Data Acquisition Systems
High Speed Modems
Optical Sensors
Personal Digital Assistants
Medical Instruments
Mobile Communications
3.6 mW Typ at 1 MSPS with 3 V Supplies
15 mW Typ at 1 MSPS with 5 V Supplies
70 dB SNR at 100 kHz Input Frequency
SPI
®
/QSPI™/MICROWIRE™/DSP Compatible
DD
of 2.35 V to 5.25 V
DD
. The conversion
DD
. This
PRODUCT HIGHLIGHTS
1. First 12-/10-/8-Bit ADCs in a SOT-23 Package.
2. High Throughput with Low Power Consumption.
3. Flexible Power/Serial Clock Speed Management.
4. Reference Derived from the Power Supply.
5. No Pipeline Delay.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
The parts feature a standard successive-approximation ADC
with accurate control of the sampling instant via a CS input
and once-off conversion control.
The conversion rate is determined by the serial clock, allowing
the conversion time to be reduced through the serial clock
speed increase. This allows the average power consumption
to be reduced while not converting. The part also features a
shutdown mode to maximize power efficiency at lower
throughput rates. Current consumption is 1 µA maximum
when in shutdown.
AD7476/AD7477/AD7478
1 MSPS, 12-/10-/8-Bit ADCs
V
IN
FUNCTIONAL BLOCK DIAGRAM
AD7476/AD7477/AD7478
T/H
© 2004 Analog Devices, Inc. All rights reserved.
APPROXIMATION
SUCCESSIVE-
8-/10-/12-BIT
GND
CONTROL
in 6-Lead SOT-23
LOGIC
ADC
V
DD
www.analog.com
SCLK
SDATA
CS
*

Related parts for AD7477SRT

AD7477SRT Summary of contents

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... 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 owners. 1 MSPS, 12-/10-/8-Bit ADCs ...

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AD7476–SPECIFICATIONS Parameter DYNAMIC PERFORMANCE 3 Signal-to-(Noise + Distortion) (SINAD) 3 Signal-to-Noise Ratio (SNR) 3 Total Harmonic Distortion (THD) 3 Peak Harmonic or Spurious Noise (SFDR) 3 Intermodulation Distortion (IMD) Second-Order Terms Third-Order Terms Aperture Delay Aperture Jitter Full Power Bandwidth ...

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AD7477–SPECIFICATIONS Parameter DYNAMIC PERFORMANCE Signal-to-(Noise + Distortion) (SINAD) Total Harmonic Distortion (THD) Peak Harmonic or Spurious Noise (SFDR) Intermodulation Distortion (IMD) Second-Order Terms Third-Order Terms Aperture Delay Aperture Jitter Full Power Bandwidth DC ACCURACY Resolution Integral Nonlinearity Differential Nonlinearity Offset ...

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AD7476–SPECIFICATIONS 8 Parameter DYNAMIC PERFORMANCE Signal-to-(Noise + Distortion) (SINAD) Total Harmonic Distortion (THD) Peak Harmonic or Spurious Noise (SFDR) Intermodulation Distortion (IMD) Second-Order Terms Third-Order Terms Aperture Delay Aperture Jitter Full Power Bandwidth DC ACCURACY Resolution Integral Nonlinearity Differential Nonlinearity ...

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TIMING SPECIFICATIONS Limit MIN AD7476/AD7477/AD7478 3 Parameter SCLK × × CONVERT SCLK QUIET t ...

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... AD7476BRTZ-REEL 3 AD7476BRTZ-REEL7 AD7476SRT-500RL7 AD7476SRT-R2 AD7476SRT-REEL AD7476SRT-REEL7 3 AD7476SRTZ-500RL7 3 AD7476SRTZ-R2 3 AD7476SRTZ-REEL 3 AD7476SRTZ-REEL7 AD7477ART-500RL7 AD7477ART-REEL AD7477ART-REEL7 AD7477SRT-500RL7 AD7477SRT-R2 AD7477SRT-REEL AD7477SRT-REEL7 AD7478ART-500RL7 AD7478ART-REEL AD7478ART-REEL7 AD7478SRT-500RL7 AD7478SRT-R2 AD7478SRT-REEL7 4 EVAL-AD7476CB 4 EVAL-AD7477CB 5 EVAL-CONTROL BRD2 NOTES 1 Linearity Error here refers to integral linearity error SOT-23 free. 4 This can be used as a standalone evaluation board or in conjunction with the EVAL-CONTROL BOARD for evaluation/demonstration purposes. ...

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Pin No. Mnemonic Function 1 V Power Supply Input. The GND Analog Ground. Ground reference point for all circuitry on the AD7476/AD7477/AD7478. All analog input signals should be referred to this GND voltage Analog Input. ...

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AD7476/AD7477/AD7478 TERMINOLOGY Integral Nonlinearity This is the maximum deviation from a straight line passing through the endpoints of the ADC transfer function. For the AD7476/ AD7477, the endpoints of the transfer function are zero scale, a point 1/2 LSB below ...

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Typical Performance Characteristics–AD7476/AD7477/AD7478 0 –15 –35 –55 –75 –95 –115 50 100 150 200 250 300 0 FREQUENCY – kHz TPC 1. AD7476 Dynamic Performance at 1 MSPS –15 –15 –35 –55 –75 –95 –115 0 50 100 150 FREQUENCY ...

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AD7476/AD7477/AD7478 CIRCUIT INFORMATION The AD7476/AD7477/AD7478 are, respectively, 12-bit, 10-bit, and 8-bit, fast, micropower, single-supply ADCs. The parts can be operated from a 2. 5.25 V supply. When operated from either supply ...

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Alternatively, because the supply current required by the AD7476/AD7477/AD7478 is so low, a precision reference can be used as the supply source to the AD7476/AD7477/AD7478. A REF19x voltage reference (REF195 for REF193 for 3 V) can be ...

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AD7476/AD7477/AD7478 –50 –55 –60 –65 V –70 DD –75 –80 –85 –90 10k 100k INPUT FREQUENCY – Hz Figure 9. THD vs. Analog Input Frequency, f –72 –74 –76 –78 –80 –82 –84 10k 100k INPUT FREQUENCY – Hz Figure ...

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THE PART BEGINS TO POWER SCLK SDATA INVALID DATA conversion result. CS may idle high until the next conversion or may idle low until CS returns high sometime prior to the next conversion (effectively idling CS ...

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AD7476/AD7477/AD7478 POWER VS. THROUGHPUT RATE By using the Power-Down mode on the AD7476/AD7477/AD7478 when not converting, the average power consumption of the ADC decreases at lower throughput rates. Figure 14 shows how as the throughput rate is reduced, the device ...

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SCLK THREE- STATE Z ZERO ZERO SDATA 4 LEADING ZEROS Figure 15. AD7476 Serial Interface Timing Diagram SCLK THREE- STATE Z ZERO ZERO SDATA 4 LEADING ...

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AD7476/AD7477/AD7478 MICROPROCESSOR INTERFACING The serial interface on the AD7476/AD7477/AD7478 allows the part to be directly connected to a range of many different microprocessors. This section explains how to interface the AD7476/AD7477/AD7478 with some of the more common microcontroller and DSP ...

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AD7476/AD7477/AD7478 to DSP56xxx Interface The connection diagram in Figure 20 shows how the AD7476/ AD7477/AD7478 can be connected to the SSI (Synchronous Serial Interface) of the DSP56xxx family of DSPs from Motorola. The SSI is operated in Synchronous Mode (SYN ...

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AD7476/AD7477/AD7478 0.15 MAX OUTLINE DIMENSIONS 6-Lead Plastic Surface-Mount Package [SOT-23] (RT-6) Dimensions shown in millimeters 2.90 BSC 2.80 BSC 1.60 BSC PIN 1 0.95 BSC 1.90 1.30 BSC 1.15 0.90 1.45 MAX 0.22 0.08 ...

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Revision History Location 3/04—Data Sheet changed from REV REV. D. Added U.S. Patent number . . . . . . . . . . . . . . . . . . . . . . . . ...

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