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PDF AD7793 Data sheet ( Hoja de datos )
| Número de pieza | AD7793 | |
| Descripción | (AD7792 / AD7793) 16/24-Bit Sigma-Delta ADC | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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Low Power, 16/24-Bit Sigma-Delta ADC with
Low-Noise In-Amp and Embedded Reference
Preliminary Technical Data
AD7792/AD7793
FEATURES
Resolution:
AD7792: 16-Bit
AD7793: 24-Bit
Low Noise Programmable Gain Instrumentation-Amp
RMS noise: 80 nV (Gain = 64)
Bandgap Reference with 5ppm/ C Drift typ
Power
Supply: 2.7 V to 5.25 V operation
Normal: 400 µA typ
Power-down: 1 µA max
Update Rate: 4 Hz to 500 Hz
Simultaneous 50 Hz/60 Hz Rejection
Internal Clock Oscillator
Programmable Current Sources (10 µA/200 µA/1 mA)
On-Chip Bias Voltage Generator
100 nA Burnout Currents
Independent Interface Power Supply
16-Lead TSSOP Package
INTERFACE
3-wire serial
SPI®, QSPI™, MICROWIRE™, and DSP compatible
Schmitt trigger on SCLK
APPLICATIONS
Thermocouple Measurements
RTD Measurements
Thermistor Measurements
FUNCTIONAL BLOCK DIAGRAM
GND AVDD
REFIN(+)/AIN3(+) REFIN(-)/AIN3(-)
VBIAS
VDD
AIN1(+)
AIN1(-)
AIN2(+)
AIN2(-)
IOUT1
MUX
VDD
GND
BANDGAP
REFERENCE
GND
IN-AMP
SIGMA DELTA
ADC
INTERNAL
CLOCK
SERIAL
INTERFACE
AND
CONTROL
LOGIC
IOUT2
AD7792/AD7793
CLK
DOUT/RDY
DIN
SCLK
CS
DVDD
Figure 1.
GENERAL DESCRIPTION
The AD7792/AD7793 is a low power, complete analog front end
for low frequency measurement applications. The
AD7792/AD7793 contains a low noise 16/24-bit ∑-∆ ADC with
three differential analog inputs. The on-chip low noise
instrumentation amplifier means that signals of small
amplitude can be interfaced directly to the ADC. With a gain
setting of 64, the rms noise is 80 nV when the update rate equals
16.6 Hz.
The device contains a precision low noise, low drift internal
bandgap reference for absolute measurements. An external
reference can also be used if ratiometric measurements are re-
quired. On-chip programmable excitation current sources can
be used to supply a constant current to RTDs and thermistors
while the 100 nA burnout currents can be used to ensure that
the sensors connected to the ADC are not burnt out. For ther-
mocouple applications, the on-chip bias voltage generator steps
up the common mode voltage from the thermocouple so that it
is within the ADC’s allowable range.
The device can be operated with the internal clock or, alterna-
tively, an external clock can be used if synchronizing several
devices. The output data rate from the part is software pro-
grammable and can be varied from 4 Hz to 500 Hz.
The part operates with a power supply from 2.7 V to 5.25 V. It
consumes a current of 450 uA maximum and is housed in a 16-
lead TSSOP package.
REV.PrF
6/04.
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 companies.
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.
1 page  
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Preliminary Technical Data
Parameter
VT(+)
VT(–)
VT(+) - VT(–)
CLK2
VINL, Input Low Voltage
VINL, Input Low Voltage
VINH, Input High Voltage
VINH, Input High Voltage
Input Currents
Input Capacitance
LOGIC OUTPUTS (Including CLK)
VOH, Output High Voltage2
VOL, Output Low Voltage2
VOH, Output High Voltage2
VOL, Output Low Voltage2
AD7792/AD7793B
0.9/2
0.4/1.1
0.3/0.85
Unit
V min/V max
V min/V max
V min/V max
0.8 V max
0.4 V max
3.5 V min
2.5 V min
±1 µA max
10 pF typ
DVDD – 0.6
0.4
4
0.4
V min
V max
V min
V max
Floating-State Leakage Current
Floating-State Output Capacitance
Data Output Coding
SYSTEM CALIBRATION2
Full-Scale Calibration Limit
Zero-Scale Calibration Limit
Input Span
POWER REQUIREMENTS7
Power Supply Voltage
AVDD – GND
DVDD – GND
Power Supply Currents
IDD Current
IDD (Power-Down Mode)
±1
10
Offset Binary
1.05 x FS
-1.05 x FS
0.8 x FS
2.1 x FS
2.7/5.25
2.7/5.25
150
175
380
450
1
µA max
pF typ
V max
V min
V min
V max
V min/max
V min/max
µA max
µA max
µA max
µA max
µA max
AD7792/AD7793
Test Conditions/Comments
DVDD = 3 V
DVDD = 3 V
DVDD = 3 V
DVDD = 5 V
DVDD = 3 V
DVDD = 5 V
DVDD = 3 V
VIN = DVDD or GND
All Digital Inputs
DVDD = 3 V, ISOURCE = 100 µA
DVDD = 3 V, ISINK = 100 µA
DVDD = 5 V, ISOURCE = 200 µA
DVDD = 5 V, ISINK = 1.6 mA (DOUT/RDY)/800 µA
(CLK)
125 µA typ, Unbuffered Mode, Ext. Reference
150 µA typ, Buffered Mode, In-Amp Bypassed, Ext
Ref
330 µA typ, In-Amp used, Ext. Ref
400 µA typ, In-Amp used, Int Ref
1 Temperature Range –40°C to +105°C.
2 Specification is not production tested but is supported by characterization data at initial product release.
3 Following a self-calibration, this error will be in the order of the noise for the programmed gain and update rate selected. A system calibration will completely remove
this error.
4 Recalibration at any temperature will remove these errors.
5 Full-scale error applies to both positive and negative full-scale and applies at the factory calibration conditions (AVDD = 4 V).
6 FS[3:0] are the four bits used in the mode register to select the output word rate.
7 Digital inputs equal to DVDD or GND.
REV.PrF 6/04 | Page 5
5 Page 
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Preliminary Technical Data
TYPICAL PERFORMANCE CHARACTERISTICS
AD7792/AD7793
Figure 6.
Figure 9.
Figure 7.
Figure 10.
Figure 8.
REV.PrF 6/04 | Page 11
Figure 11.
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet AD7793.PDF ] | |
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