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PDF AD7991 Data sheet ( Hoja de datos )
| Número de pieza | AD7991 | |
| Descripción | (AD7991 - AD7999) 12-/10-/8-Bit ADC | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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4-Channel, 12-/10-/8-Bit ADC with I2C-
Compatible Interface in 8-Lead SOT23
Preliminary Technical Data
AD7991/AD7995/AD7999
FEATURES
12-/10-/8-bit ADC with fast conversion time: 2 µs typ
4 Channel / 3 Channel with Reference input
Specified for VDD of 2.7 V to 5.5 V
Sequencer operation
Temperature Range: -40 °C to 125 °C
I2C®-compatible serial interface supports standard, fast,
and High-speed modes
2 versions allow 2 I2C addresses
Low power consumption
Shutdown mode: 1 µA max
8-lead SOT23 package
APPLICATIONS
System Monitoring
Battery Powered Systems
Data Acquisition
Medical Instruments
FUNCTIONAL BLOCK DIAGRAM
VDD
VIN0
VIN1
VIN2
VIN3/Vref
I/P T/H
MUX
12-/10-/8-BIT
SAR
ADC
CONTROL
LOGIC &
I2C
INTERFACE
AD7991/7995/7999
GND
Figure 1.
SCL
SDA
GENERAL DESCRIPTION
The AD7991/AD7995/AD7999 are 12-/10-/8-bit, low power,
successive approximation ADCs with an I2C-compatible
interface. The parts operate from a single 2.7 V to 5.5 V power
supply and feature a 2 µs conversion time. The part contains a
4-channel multiplexer and track-and-hold amplifier that can
handle input frequencies up to 11 MHz.
The AD7991/AD7995/AD7999 provides a 2-wire serial
interface compatible with I2C interfaces. The parts come in two
versions with each part having an individual I2C address. This
will allow two of the same devices be connected to the same I2C
bus. Both parts support standard, fast and high-speed I2C
interface modes
The AD7991/AD7995/AD7999 normally remain in a shutdown
state while not converting, and power up only for conversions.
The conversion process is controlled by a command mode,
where every time an I2C read operation is executed on the
AD7991/AD7995/AD7999, a conversion is performed and the
result is returned on the I2C bus.
The reference for the part is taken from VDD, this allows the
widest dynamic input range to the ADC. Thus the analog input
range to the ADC is 0V to VDD. An external reference may also
be used with this part. The external reference may be applied
through the Ain3 input.
Rev. PrB
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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
PRODUCT HIGHLIGHTS
1. 4 single ended analog input channels, with the option of
having 3 single ended analog input channels and 1
reference input channel.
2. I2C compatible serial Interface. Standard, Fast and Hs-
Modes
3. Automatic shutdown.
4. Reference derived from the power supply or external
reference.
5. 8-lead SOT23 Package.
Table 1 Related Devices
Device Number Resolution
Input Channels
AD7998
12
8
AD7997
10
8
AD7994
12
4
AD7993
10
4
AD7992
12
2
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2006 Analog Devices, Inc. All rights reserved.
1 page  
Preliminary Technical Data
AD7991/AD7995/AD7999
AD7995 SPECIFICATIONS
Temperature range for Y version is −40°C to +125°C. Unless otherwise noted, VDD = 2.7 V to 5.5 V; fSCL = 3.4 Mhz Unless otherwise noted;
TA = TMIN to TMAX.
Table 3.
Parameter
DYNAMIC PERFORMANCE1
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
Channel-to-Channel Isolation2
Full Power Bandwidth2
DC ACCURACY
Resolution
Integral Nonlinearity1, 2
Differential Nonlinearity1, 2
Offset Error2
Offset Error Matching
Offset Temperature drift
Gain Error2
Gain Error Matching
Gain Temperature drift
ANALOG INPUT
Input Voltage Range
DC Leakage Current
Input Capacitance
REFERENCE INPUT
REFIN Input Voltage Range
DC Leakage Current
REFIN Input Capacitance
Input Impedance
LOGIC INPUTS (SDA, SCL)
Input High Voltage, VINH
Input Low Voltage, VINL
Input Leakage Current, IIN
Input Capacitance, CIN3
Input Hysteresis, VHYST
LOGIC OUTPUTS (OPEN DRAIN)
Output Low Voltage, VOL
Floating-State Leakage Current
Floating-State Output Capacitance3
Output Coding
THROUGHPUT RATE
Y Version Unit
61 dB min
–75 dB max
–76 dB max
–86 dB typ
–86 dB typ
-90 dB typ
11 MHz typ
2 MHz typ
10 Bits
±0.5 LSB max
±0.5 LSB max
±2 LSB max
±0.5 LSB max
TBD ppm/°C typ
±1.5 LSB max
±0.5 LSB max
TBD ppm/°C typ
0 to REFIN
±1
30
V
µA max
pF typ
1.2 to VDD
±1
30
69
V min/V max
µA max
pF typ
kΩ typ
0.7 (VDD)
0.3 (VDD)
±1
10
0.1 (VDD)
V min
V max
µA max
pF max
V min
0.4 V max
0.6 V max
±1 µA max
10 pF max
Straight (Natural) Binary
18 * (1/fSCL) us max
Test Conditions/Comments
FIN = 10 kHz sine wave for fSCL from 1.7 MHz to
3.4 MHz
FIN = 1 kHz sine wave for fSCL up to 400 kHz
fa = 10.1 kHz, fb = 9.9 kHz for fSCL from 1.7 MHz
to 3.4 MHz
fa = 1.1 kHz, fb = 0.9 kHz for fSCL up to 400 kHz
FIN = 108 Hz; see the Terminology Section
@ 3 dB
@ 0.1 dB
Guaranteed no missed codes to 10 bits
When Vin3/VREF = VIN3, Vref = VDD
VIN = 0 V or VDD
ISINK = 3 mA
ISINK = 6 mA
See the Serial Interface section
Rev. PrB | Page 5 of 25
5 Page 
Preliminary Technical Data
ABSOLUTE MAXIMUM RATINGS
AD7991/AD7995/AD7999
TA = 25°C, unless otherwise noted.
Table 6.
Parameter
VDD to GND
Analog Input Voltage to GND
Reference Input Voltage to GND
Digital Input Voltage to GND
Digital Output Voltage to GND
Input Current to Any Pin Except Supplies1
Operating Temperature Range
Commercial (B Version)
Industrial (Y Version)
Storage Temperature Range
Junction Temperature
8-Lead SOT-23 Package
θJA Thermal Impedance
θJC Thermal Impedance
Pb/SN Temperature, Soldering
Reflow (10 sec to 30 sec)
Pb-Free Temperature, Soldering Reflow
ESD
Rating
−0.3 V to 7 V
−0.3 V to VDD + 0.3 V
−0.3 V to VDD + 0.3 V
−0.3 V to +7 V
−0.3 V to VDD + 0.3 V
±10 mA
−40°C to +85°C
−40°C to +125°C
−65°C to +150°
150°C
TBD °C/W
TBD °C/W
TBD °C
TBD °C
TBD kV
1 Transient currents of up to 100 mA do not cause SCR latch-up.
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those listed in the operational sections
of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
ESD CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on
the human body and test equipment and can discharge without detection. Although this product features
proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy
electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance
degradation or loss of functionality.
Rev. PrB | Page 11 of 25
11 Page | ||
| Páginas | Total 25 Páginas | |
| PDF Descargar | [ Datasheet AD7991.PDF ] | |
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