AD7789

Features:

AD7788: 16-bit resolution
AD7789: 24-bit resolution
Power
Supply: 2.5 V to 5.25 V operation
Normal: 75 A maximum
Power-down: 1 A maximum
RMS noise: 1.5 V
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_DD monitor channel
10-lead MSOP

Application

Smart transmitters
Battery applications
Portable instrumentation
Sensor measurement
Temperature measurement
Pressure measurement
Weigh scales
4 to 20 mA loops




Pinout








Specifications



Parameter Rating
V_DD to GND 0.3 V to +7 V
Analog Input Voltage to GND 0.3 V to VDD + 0.3 V
Reference Input Voltage to GND 0.3 V to VDD + 0.3 V
Total AIN/REFIN Current (Indefinite) 30 mA
Digital Input Voltage to GND 0.3 V to VDD + 0.3 V
Digital Output Voltage to GND 0.3 V to VDD + 0.3 V
Operating Temperature Range
B Grade 40°C to +105°C
A Grade 40°C to +85°C
Storage Temperature Range 65°C to +150°C
Maximum Junction Temperature 150°C
MSOP
_JA Thermal Impedance 206°C/W
_JC Thermal Impedance 44°C/W
Lead Temperature, Soldering (10 sec) 300°C
IR Reflow, Peak Temperature 220°C




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 - ADC with one differential input. The AD7788 is a 16-bit version of the AD7789.

The device AD7788/AD7789 operates from an internal clock. Therefore, the user does not have to supply a clock source to the device. The output data rate is 16.6 Hz, which gives simultaneous 50 Hz/60 Hz rejection.

The part AD7788/AD7789 operates with a single power supply from 2.5 V to 5.25 V. When operating from a 3 V supply, the power dissipation for the part is 225 W maximum. The AD7788/AD7789 is housed in a 10-lead MSOP.