AD7789BRMZ Analog Devices Inc, AD7789BRMZ Datasheet

IC ADC 24BIT LP 10-MSOP

AD7789BRMZ

Manufacturer Part Number
AD7789BRMZ
Description
IC ADC 24BIT LP 10-MSOP
Manufacturer
Analog Devices Inc
Datasheet

Specifications of AD7789BRMZ

Data Interface
DSP, MICROWIRE™, QSPI™, Serial, SPI™
Number Of Bits
24
Sampling Rate (per Second)
16.6
Number Of Converters
1
Power Dissipation (max)
230µW
Voltage Supply Source
Single Supply
Operating Temperature
-40°C ~ 105°C
Mounting Type
Surface Mount
Package / Case
10-TFSOP (0.118", 3.00mm Width)
Resolution (bits)
24bit
Input Channel Type
Differential
Supply Current
80µA
Digital Ic Case Style
SOP
No. Of Pins
10
Operating Temperature Range
-40°C To +105°C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

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Manufacturer
Quantity
Price
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AD7789BRMZ
Manufacturer:
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FEATURES
AD7788: 16-bit resolution
AD7789: 24-bit resolution
Power
RMS noise: 1.5 μV
AD7788: 16-bit p-p resolution
AD7789: 19-bit p-p resolution (21.5 bits effective)
Integral nonlinearity: 3.5 ppm typical
Simultaneous 50 Hz and 60 Hz rejection
Internal clock oscillator
V
10-lead MSOP
INTERFACE
3-wire serial
SPI®-, QSPI™-, MICROWIRE™-, and DSP-compatible
Schmitt trigger on SCLK
APPLICATIONS
Smart transmitters
Battery applications
Portable instrumentation
Sensor measurement
Temperature measurement
Pressure measurement
Weigh scales
4 to 20 mA loops
Rev. B
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.
DD
Supply: 2.5 V to 5.25 V operation
Normal: 75 μA maximum
Power-down: 1 μA maximum
monitor channel
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 AD7788/AD7789 are low power, low noise, analog front
ends for low frequency measurement applications. The AD7789
contains a low noise, 24-bit, ∑-Δ ADC with one differential
input. The AD7788 is a 16-bit version of the AD7789.
The devices operate from an internal clock. Therefore, the
user does not have to supply a clock source to the devices.
The output data rate is 16.6 Hz, which gives simultaneous
50 Hz/60 Hz rejection.
The parts operate with a single power supply from 2.5 V to
5.25 V. When operating from a 3 V supply, the power dissi-
pation for the part is 225 μW maximum. The AD7788/AD7789
are available in a 10-lead MSOP.
AIN(+)
AIN(–)
AD7788/
AD7789
FUNCTIONAL BLOCK DIAGRAM
*AD7788: 16-BIT ADC
AD7789: 24-BIT ADC
Low Power, 16-/24-Bit,
REFIN(+) REFIN(–)
©2006 Analog Devices, Inc. All rights reserved.
Sigma-Delta ADCs
ADC*
Σ-Δ
Figure 1.
AD7788/AD7789
GND
INTERFACE
CONTROL
CLOCK
SERIAL
LOGIC
AND
V
DD
www.analog.com
DOUT/RDY
DIN
SCLK
CS

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AD7789BRMZ Summary of contents

Page 1

FEATURES AD7788: 16-bit resolution AD7789: 24-bit resolution Power Supply: 2 5.25 V operation Normal: 75 μA maximum Power-down: 1 μA maximum RMS noise: 1.5 μV AD7788: 16-bit p-p resolution AD7789: 19-bit p-p resolution (21.5 bits effective) Integral nonlinearity: ...

Page 2

AD7788/AD7789 TABLE OF CONTENTS Features .............................................................................................. 1 Interface ............................................................................................. 1 Applications....................................................................................... 1 Functional Block Diagram .............................................................. 1 General Description ......................................................................... 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 AD7789 .......................................................................................... 3 AD7788 .......................................................................................... 4 AD7788/AD7789.......................................................................... 5 Timing Characteristics ................................................................ 6 Timing ...

Page 3

SPECIFICATIONS AD7789 5.25 V; REFIN(+) = 2.5 V; REFIN(−) = GND; GND = 0 V; all specifications T DD Table 1. 1 Parameter ADC CHANNEL SPECIFICATION Output Update Rate ADC CHANNEL 2 No Missing Codes ...

Page 4

AD7788/AD7789 AD7788 grade 2 5. grade); REFIN(+) = 2.5 V; REFIN(−) = GND; GND = 0 V; all specifications unless ...

Page 5

AD7788/AD7789 Table 3. Parameter LOGIC INPUTS 1 All Inputs Except SCLK V , Input Low Voltage INL V , Input High Voltage INH SCLK Only (Schmitt-Triggered Input) V (+) − (+) ...

Page 6

AD7788/AD7789 TIMING CHARACTERISTICS 5.25 V (AD7788B and AD7789 Input Logic Input Logic Table Parameter Limit MIN MAX t ...

Page 7

TIMING DIAGRAMS DOUT/RDY (O) I (1.6mA WITH V SINK 100µA WITH OUTPUT 1.6V PIN 50pF I (200µA WITH V SOURCE 100µA WITH V DD Figure 2. Load Circuit for Timing Characterization CS ( MSB t ...

Page 8

AD7788/AD7789 ABSOLUTE MAXIMUM RATINGS T = 25°C, unless otherwise noted. A Table 5. Parameter V to GND DD Analog Input Voltage to GND Reference Input Voltage to GND Total AIN/REFIN Current (Indefinite) Digital Input Voltage to GND Digital Output Voltage ...

Page 9

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS Table 6. Pin Function Descriptions Pin No. Mnemonic Description 1 SCLK Serial Clock Input for Data Transfers to and from the ADC. The SCLK has a Schmitt-triggered input, making the interface suitable for opto-isolated applications. ...

Page 10

AD7788/AD7789 TYPICAL PERFORMANCE CHARACTERISTICS 0 –10 –20 –30 –40 –50 –60 –70 –80 –90 –100 –110 –120 100 FREQUENCY (Hz) Figure 6. Frequency Response with 16.6 Hz Update Rate ...

Page 11

ON-CHIP REGISTERS The ADC is controlled and configured via a number of on-chip registers, which are described on the following pages. In the following descriptions, set implies a Logic 1 state and cleared implies a Logic 0 state, unless otherwise ...

Page 12

AD7788/AD7789 Table 8. Register Selection RS1 RS0 Register 0 0 Communications register during a write operation 0 0 Status register during a read operation 0 1 Mode register 1 0 Reserved 1 1 Data register Table 9. Channel Selection CH1 ...

Page 13

MODE REGISTER (RS1, RS0 = 0, 1; Power-On/Reset = 0x02) The mode register is an 8-bit register from which data can be read from or written to. This register is used to configure the ADC for range, to set unipolar ...

Page 14

AD7788/AD7789 ADC CIRCUIT INFORMATION The AD7788/AD7789 are low power ADCs that incorporate a Σ-Δ modulator and on-chip digital filtering intended for the measurement of wide dynamic range, low frequency signals, such as those in pressure transducers, weigh scales, and temper- ...

Page 15

The serial interface can be reset by writing a series the DIN input Logic 1 is written to the AD7788/AD7789 for at least 32 serial clock cycles, the serial interface is reset. This ensures that ...

Page 16

AD7788/AD7789 Continuous Read Mode Rather than write to the communications register each time a conversion is complete to access the data, the AD7788/AD7789 can be placed in continuous read mode. By writing 001111XX to the communications register, the user needs ...

Page 17

CIRCUIT DESCRIPTION ANALOG INPUT CHANNEL The AD7788/AD7789 have one differential analog input channel that is connected to the modulator, thus, the input is unbuffered. Note that this unbuffered input path provides a dynamic load to the driving source. Therefore, resistor/capacitor ...

Page 18

AD7788/AD7789 Reference voltage sources like those recommended in the pre- vious section (for example, ADR391) typically have low output impedances and are, therefore, tolerant to having decoupling capacitors on REFIN(+) without introducing gain errors in the system. Deriving the reference ...

Page 19

... AD7788ARM-REEL −40°C to +85°C 1 AD7788ARMZ −40°C to +85°C AD7789BRM −40°C to +105°C AD7789BRM-REEL −40°C to +105°C 1 AD7789BRMZ −40°C to +105°C 1 AD7789BRMZ-REEL −40°C to +105°C EVAL-AD7788EB EVAL-AD7789EB Pb-free part. 3.10 3.00 2. 5.15 3.10 4.90 3 ...

Page 20

AD7788/AD7789 NOTES ©2006 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. C03539-0-3/06(B) Rev Page ...

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