AD7191BRUZ Analog Devices Inc, AD7191BRUZ Datasheet

IC ADC 2CH 24B SD 24TSSOP

AD7191BRUZ

Manufacturer Part Number
AD7191BRUZ
Description
IC ADC 2CH 24B SD 24TSSOP
Manufacturer
Analog Devices Inc
Datasheet

Specifications of AD7191BRUZ

Data Interface
MICROWIRE™, QSPI™, Serial, SPI™
Design Resources
Precision Weigh Scale Design Using AD7191 with Internal PGA (CN0118)
Number Of Bits
24
Number Of Converters
1
Voltage Supply Source
Analog and Digital
Operating Temperature
-40°C ~ 105°C
Mounting Type
Surface Mount
Package / Case
24-TSSOP (0.173", 4.40mm Width)
Resolution (bits)
24bit
Sampling Rate
120SPS
Input Channel Type
Differential
Supply Voltage Range - Analog
3V To 5.25V
Supply Voltage Range - Digital
2.7V To 5.25V
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

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Price
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AD7191BRUZ
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ADI
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1 000
Part Number:
AD7191BRUZ
Manufacturer:
Analog Devices Inc
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135
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AD7191BRUZ
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FEATURES
Pin-programmable output rate
Output data rate: 10 Hz, 50 Hz, 60 Hz, 120 Hz
Pin-programmable PGA
Gain: 1, 8, 64, 128
Pin-programmable power-down and reset
RMS noise: 15 nV @ 10 Hz (gain = 128)
Up to 21.5 noise free bits (gain = 1)
Internal or external clock
Bridge power-down switch
Offset drift: 5 nV/°C
Gain drift: 1 ppm/°C
Specified drift over time
Simultaneous 50 Hz/60 Hz rejection
Internal temperature sensor
Power supply: 3 V to 5.25 V
Current: 4.35 mA
Temperature range: –40°C to +105°C
Package: 24-lead TSSOP
INTERFACE
2-wire serial
SPI, QSPI™, and MICROWIRE™ compatible
Schmitt trigger on SCLK
APPLICATIONS
Weigh scales
Strain gauge transducers
Pressure measurement
Medical and scientific instrumentation
Rev. A
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.
BPDSW
AIN1
AIN2
AIN3
AIN4
AV
AD7191
DD
MUX
AGND
TEMPERATURE
Pin-Programmable, Ultralow Noise, 24-Bit,
SENSOR
FUNCTIONAL BLOCK DIAGRAM
DV
DD
PGA
DGND
MCLK1
Sigma-Delta ADC for Bridge Sensors
CIRCUITRY
CLOCK
REFIN(+) REFIN(–)
Figure 1.
MCLK2
ADC
Σ-Δ
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
GENERAL DESCRIPTION
The AD7191 is a low noise, complete analog front end for high
precision measurement applications. It contains a low noise,
24-bit sigma-delta (Σ-Δ) ADC. The on-chip low noise gain
stage means that signals of small amplitude can be interfaced
directly to the ADC. It contains two differential analog inputs.
The part also includes a temperature sensor that can be used for
temperature compensation.
For ease-of-use, all the features of the AD7191 are controlled by
dedicated pins. The on-chip PGA has a gain of 1, 8, 64, or 128,
supporting a full-scale differential input of ±5 V, ±625 mV,
±78 mV, or ±39 mV. The output data rate can be programmed
to 10 Hz, 50 Hz, 60 Hz, or 120 Hz. Simultaneous 50 Hz and 60 Hz
rejection is obtained when the output data rate is set to 10 Hz
or 50 Hz; 60 Hz only rejection is obtained when the output data
rate is set to 60 Hz. The AD7191 can be operated with the
internal clock, or an external clock can be used.
The part operates with a power supply of 3 V to 5.25 V. It
consumes a current of 4.35 mA. It is available in a 24-lead
TSSOP package.
ODR2 ODR1 TEMP
AND CONTROL
INTERFACE
SERIAL
LOGIC
©2009 Analog Devices, Inc. All rights reserved.
DOUT/RDY
SCLK
PDOWN
CHAN
CLKSEL
PGA2
PGA1
AD7191
www.analog.com

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AD7191BRUZ Summary of contents

Page 1

FEATURES Pin-programmable output rate Output data rate: 10 Hz, 50 Hz, 60 Hz, 120 Hz Pin-programmable PGA Gain 64, 128 Pin-programmable power-down and reset RMS noise (gain = 128 21.5 noise ...

Page 2

AD7191 TABLE OF CONTENTS Features .............................................................................................. 1 Interface ............................................................................................. 1 Applications ....................................................................................... 1 General Description ......................................................................... 1 Functional Block Diagram .............................................................. 1 Revision History ............................................................................... 2 Specifications ..................................................................................... 3 Timing Characteristics ................................................................ 6 Timing Diagram ........................................................................... 6 Absolute Maximum Ratings ...

Page 3

SPECIFICATIONS 5. 2 5.25 V; AGND = DGND = 0 V; REFIN(+) = specifications unless otherwise noted. MIN MAX Table 1. 1 Parameter ...

Page 4

AD7191 1 Parameter Analog Input Current 2 Input Current Input Current Drift REFERENCE INPUT REFIN Voltage 2 Reference Voltage Range 2 Absolute REFIN Voltage Limits Average Reference Input Current Average Reference Input Current Drift 2 Normal-Mode Rejection Common-Mode Rejection TEMPERATURE ...

Page 5

Parameter Floating-State Leakage Current Floating-State Output Capacitance Data Output Coding 3 POWER REQUIREMENTS Power Supply Voltage AV − AGND DD DV − DGND DD Power Supply Currents AI Current DD DI Current DD I (Power-Down Mode Temperature ...

Page 6

AD7191 TIMING CHARACTERISTICS 5. 2 5.25 V; AGND = DGND = 0 V, Input Logic Input Logic Table ...

Page 7

ABSOLUTE MAXIMUM RATINGS T = 25°C, unless otherwise noted. A Table 3. Parameter AV to AGND DGND DD AGND to DGND Analog Input Voltage to AGND Reference Input Voltage to AGND Digital Input Voltage to DGND Digital ...

Page 8

AD7191 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS Table 4. Pin Function Descriptions Pin No. Mnemonic Description When the master clock for the device is provided externally by a crystal, the crystal is connected between 1 MCLK1 MCLK1 and MCLK2. Alternatively, the ...

Page 9

Pin No. Mnemonic Description 20 AV Analog Supply Voltage 5. with Digital Supply Voltage with DV 22 ODR1 Output Data Rate, Digital Input Pin. ...

Page 10

AD7191 TYPICAL PERFORMANCE CHARACTERISTICS 8,388,295 8,388,290 8,388,285 8,388,280 8,388,275 8,388,270 0 200 400 600 SAMPLE Figure 5. Noise ( Output Data Rate = 10 Hz, REF DD Gain = 128) 150 100 50 0 CODE Figure 6. ...

Page 11

SAMPLE Figure 9. Noise ( Output Data Rate = 120 Hz, REF DD Gain = 1) 150 100 50 0 CODE Figure 10. Noise Distribution Histogram ...

Page 12

AD7191 170 168 166 164 162 160 158 156 154 –60 –40 – TEMPERATURE (°C) Figure 13. Offset Error (Gain = 1) 0.4 0.2 0 –0.2 –0.4 –0.6 –0.8 –1.0 –1.2 –1.4 –60 –40 – ...

Page 13

RMS NOISE AND RESOLUTION SPECIFICATIONS Table 5 shows the rms noise of the AD7191 for the four output data rates and four gains. The numbers given are for an external 5 V reference. These numbers are typical and are generated ...

Page 14

AD7191 ADC CIRCUIT INFORMATION OVERVIEW The AD7191 is a low noise, complete analog front end for high precision measurement applications. It contains a low noise, 24-bit, Σ-Δ ADC, a PGA, and an on-chip digital filter intended for measuring wide dynamic ...

Page 15

FREQUENCY (Hz) Figure 21. Filter Profile for the 60 Hz Output Data Rate 0 –10 –20 –30 –40 –50 –60 –70 ...

Page 16

AD7191 TEMPERATURE SENSOR Embedded in the AD7191 is a temperature sensor. The temperature sensor is selected when the TEMP pin is tied high. The TEMP pin has higher priority than the CHAN pin; therefore, when TEMP is high, the temperature ...

Page 17

REFIN(+) without introducing gain errors in the system. Deriving the reference input voltage across an external resistor means that the reference input sees a significant external source impedance. External decoupling on the REFIN pins is ...

Page 18

AD7191 In systems where the AGND and DGND pins are connected somewhere else in the system(that is, at the system power supply), they should not be connected again at the AD7191 because a ground loop results. In these situations, it ...

Page 19

APPLICATIONS INFORMATION The AD7191 provides a low-cost, high resolution analog-to- digital function. Because the analog-to-digital function is provided by a ∑-Δ architecture, the part is more immune to noisy environments, making it ideal for use in sensor measurement and industrial ...

Page 20

... OUTLINE DIMENSIONS 0.15 0.05 ORDERING GUIDE Models Temperature Range 1 AD7191BRUZ –40°C to +105°C 1 AD7191BRUZ-REEL –40°C to +105° RoHS Compliant Part. ©2009 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. 7.90 7.80 7. ...

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