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AD7922 PDF даташит

Спецификация AD7922 изготовлена ​​​​«Analog Devices» и имеет функцию, называемую «2-Channel/ 2.35 V to 5.25 V/ 1 MSPS/ 10-/12-Bit ADCs».

Детали детали

Номер произв AD7922
Описание 2-Channel/ 2.35 V to 5.25 V/ 1 MSPS/ 10-/12-Bit ADCs
Производители Analog Devices
логотип Analog Devices логотип 

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AD7922 Даташит, Описание, Даташиты
FEATURES
Fast throughput rate: 1 MSPS
Specified for VDD of 2.35 V to 5.25 V
Low power:
4.8 mW typ at 1 MSPS with 3 V supplies
15.5mW typ at 1 MSPS with 5 V supplies
Wide input bandwidth:
71 dB minimum SNR at 100 kHz input frequency
Flexible power/serial clock speed management
No pipeline delays
High speed serial interface:
SPI®/QSPI™/MICROWIRE™/DSP compatible
Standby mode: 1 µA maximum
Daisy-chain mode
8-lead TSOT package
8-lead MSOP package
APPLICATIONS
Battery-powered systems:
Personal digital assistants
Medical instruments
Mobile communications
Instrumentation and control systems
Data acquisition systems
High speed modems
Optical sensors
GENERAL DESCRIPTION
The AD7912/AD79221 are 10-bit and 12-bit, high speed, low
power, 2-channel successive approximation ADCs, respectively.
The parts operate from a single 2.35 V to 5.25 V power supply
and feature throughput rates of up to 1 MSPS. The parts contain
a low noise, wide bandwidth track-and-hold amplifier, which
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 conversion rate is
determined by the SCLK signal. The input signal is sampled on
the falling edge of CS and the conversion is also initiated at this
point. The channel to be converted is selected through the DIN
pin, and the mode of operation is controlled by CS. The serial
data stream from the DOUT pin has a channel identifier bit and
mode identifier bit, which provide information about the
converted channel and the current mode of operation.
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.
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.
2-Channel, 2.35 V to 5.25 V,
1 MSPS, 10-/12-Bit ADCs
AD7912/AD7922
FUNCTIONAL BLOCK DIAGRAM
VDD
VIN0
VIN1
MUX
T/H
10-/12-BIT
SUCCESSIVE
APPROXIMATION
ADC
AD7912/AD7922 CONTROL LOGIC
SCLK
CS
DOUT
DIN
GND
Figure 1.
Several AD7912/AD7922 can be connected together in a daisy
chain. The AD7912/AD7922 feature a daisy-chain mode that
allows the user to read the conversion results from the ADCs
contained in the chain. The AD7912/AD7922 use advanced
design techniques to achieve very low power dissipation at high
throughput rates. The reference for the part is taken internally
from VDD, thereby allowing the widest dynamic input range to
the ADC.
PRODUCT HIGHLIGHTS
1. 2-channel, 1 MSPS, 10-/12-bit ADCs in TSOT package.
2. High throughput with low power consumption.
3. Flexible power/serial clock speed management.
The conversion rate is determined by the serial clock. The
parts also feature a power-down mode to maximize power
efficiency at lower throughput rates. Average power
consumption is reduced when the power-down mode is
used while not converting. Current consumption is 1 µA
maximum and 50 nA typically when in power-down mode.
4. Daisy-chain mode.
5. No pipeline delay.
The parts feature a standard successive approximation ADC
with accurate control of the sampling instant via a CS input
and once-off conversion control.
1 Protected by U.S. Patent Number 6,681,332.
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 © 2004 Analog Devices, Inc. All rights reserved.









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AD7922 Даташит, Описание, Даташиты
AD7912/AD7922
TABLE OF CONTENTS
Specifications..................................................................................... 3
AD7912 Specifications................................................................. 3
AD7922 Specifications................................................................. 5
Timing Specifications .................................................................. 7
Timing Diagrams.......................................................................... 7
Timing Examples.......................................................................... 8
Absolute Maximum Ratings............................................................ 9
ESD Caution.................................................................................. 9
Pin Configurations and Function Descriptions ......................... 10
Terminology .................................................................................... 11
Typical Performance Characteristics ........................................... 13
Circuit Information ........................................................................ 15
Converter Operation.................................................................. 15
ADC Transfer Function............................................................. 15
Typical Connection Diagram ................................................... 16
Analog Input ............................................................................... 16
Digital Inputs .............................................................................. 17
REVISION HISTORY
Revision 0: Initial Version
DIN Input.................................................................................... 17
DOUT Output ............................................................................ 17
Modes of Operation ....................................................................... 18
Normal Mode.............................................................................. 18
Power-Down Mode.................................................................... 18
Power-Up Time .......................................................................... 20
Daisy-Chain Mode ..................................................................... 20
Daisy-Chain Example ................................................................ 22
Power vs. Throughput Rate ........................................................... 24
Serial Interface ................................................................................ 25
Microprocessor Interfacing....................................................... 26
Application Hints ........................................................................... 28
Grounding and Layout .............................................................. 28
Evaluating AD7912/AD7922 Performance................................. 29
Outline Dimensions ....................................................................... 30
Ordering Guide .......................................................................... 30
Rev. 0 | Page 2 of 32









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AD7922 Даташит, Описание, Даташиты
AD7912/AD7922
SPECIFICATIONS
AD7912 SPECIFICATIONS
Temperature range for A Grade from −40°C to +85°C.
VDD = 2.35 V to 5.25 V, fSCLK = 18 MHz, fSAMPLE = 1 MSPS; TA = TMIN to TMAX, unless otherwise noted.
Table 1.
Parameter
DYNAMIC PERFORMANCE
Signal-to- Noise + Distortion (SINAD)2
Total Harmonic Distortion (THD)2
Peak Harmonic or Spurious Noise (SFDR)2
Intermodulation Distortion (IMD)2
Second-Order Terms
Third-Order Terms
Aperture Delay
Aperture Jitter
Channel-to-Channel Isolation2
Full Power Bandwidth
DC ACCURACY
Resolution
Integral Nonlinearity2
Differential Nonlinearity2
Offset Error2
Offset Error Match2, 3
Gain Error2
Gain Error Match2, 3
Total Unadjusted Error (TUE)2
ANALOG INPUT
Input Voltage Ranges
DC Leakage Current
Input Capacitance
LOGIC INPUTS
Input High Voltage, VINH
Input Low Voltage, VINL
Input Current, IIN, SCLK Pin
Input Current, IIN, CS Pin
Input Current, IIN, DIN Pin
Input Capacitance, CIN3
LOGIC OUTPUTS
Output High Voltage, VOH
Output Low Voltage, VOL
Floating-State Leakage Current
Floating-State Output Capacitance3
Output Coding
A Grade1
Unit
61 dB min
−71 dB max
−72 dB max
−82 dB typ
−83 dB typ
10 ns typ
30 ps typ
90 dB typ
8.5 MHz typ
1.5 MHz typ
10 Bits
±0.5 LSB max
±0.5 LSB max
±0.5 LSB max
±0.3 LSB max
±0.5 LSB max
±0.3 LSB max
±0.5 LSB max
0 to VDD
±0.3
20
V
µA max
pF typ
0.7 (VDD)
2
0.3
0.2 (VDD)
0.8
±0.3
±0.3
±0.3
5
V min
V min
V max
V max
V max
µA max
µA max
µA max
pF max
VDD − 0.2
V min
0.2 V max
±0.3 µA max
5 pF max
Straight (natural) binary
Test Conditions/Comments
fIN = 100 kHz sine wave
fa = 100.73 kHz, fb = 90.7 kHz
fa = 100.73 kHz, fb = 90.7 kHz
@ 3 dB
@ 0.1 dB
Guaranteed no missed codes to 10 bits
2.35 V ≤ VDD ≤ 2.7 V
2.7 V < VDD ≤ 5.25 V
VDD = 2.35 V
2.35 V < VDD ≤ 2.7 V
2.7 V < VDD ≤ 5.25 V
Typically 8 nA, VIN = 0 V or VDD
ISOURCE = 200 µA, VDD = 2.35 V to 5.25 V
ISINK = 200 µA
Rev. 0 | Page 3 of 32










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