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AD7124-8BCPZ-RL Datenblatt(PDF) 4 Page - Analog Devices

Teilenummer AD7124-8BCPZ-RL
Bauteilbeschribung  8-Channel, Low Noise, Low Power, 24-Bit, Sigma-Delta ADC with PGA and Reference
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Hersteller  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD7124-8BCPZ-RL Datenblatt(HTML) 4 Page - Analog Devices

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AD7124-8
Data Sheet
Rev. B | Page 4 of 91
GENERAL DESCRIPTION
The AD7124-8 is a low power, low noise, completely integrated
analog front end for high precision measurement applications.
The device contains a low noise, 24-bit Σ-Δ analog-to-digital
converter (ADC), and can be configured to have 8 differential
inputs or 15 single-ended or pseudo differential inputs. The on-
chip low gain stage ensures that signals of small amplitude can
be interfaced directly to the ADC.
One of the major advantages of the AD7124-8 is that it gives the
user the flexibility to employ one of three integrated power
modes. The current consumption, range of output data rates,
and rms noise can be tailored with the power mode selected.
The device also offers a multitude of filter options, ensuring that
the user has the highest degree of flexibility.
The AD7124-8 can achieve simultaneous 50 Hz and 60 Hz
rejection when operating at an output data rate of 25 SPS (single
cycle settling), with rejection in excess of 80 dB achieved at lower
output data rates.
The AD7124-8 establishes the highest degree of signal chain
integration. The device contains a precision, low noise, low
drift internal band gap reference and accepts an external
differential reference, which can be internally buffered. Other
key integrated features include programmable low drift excitation
current sources, burnout currents, and a bias voltage generator,
which sets the common-mode voltage of a channel to AVDD/2.
The low-side power switch enables the user to power down
bridge sensors between conversions, ensuring the absolute
minimal power consumption of the system. The device also
allows the user the option of operating with either an internal
clock or an external clock.
The integrated channel sequencer allows several channels to be
enabled simultaneously, and the AD7124-8 sequentially converts
on each enabled channel, simplifying communication with the
device. As many as 16 channels can be enabled at any time, a
channel being defined as an analog input or a diagnostic such
as a power supply check or a reference check. This unique
feature allows diagnostics to be interleaved with conversions.
The AD7124-8 also supports per channel configuration. The
device allows eight configurations or setups. Each configuration
consists of gain, filter type, output data rate, buffering, and
reference source. The user can assign any of these setups on a
channel by channel basis.
The AD7124-8 also has extensive diagnostic functionality
integrated as part of its comprehensive feature set. These
diagnostics include a cyclic redundancy check (CRC), signal
chain checks, and serial interface checks, which lead to a more
robust solution. These diagnostics reduce the need for external
components to implement diagnostics, resulting in reduced
board space needs, reduced design cycle times, and cost savings.
The failure modes effects and diagnostic analysis (FMEDA) of a
typical application has shown a safe failure fraction (SFF) greater
than 90% according to IEC 61508.
The device operates with a single analog power supply from 2.7 V
to 3.6 V or a dual 1.8 V power supply. The digital supply has a
range of 1.65 V to 3.6 V. It is specified for a temperature range
of −40°C to +105°C. The AD7124-8 is housed in a 32-lead
LFCSP package.
Note that, throughout this data sheet, multifunction pins, such
as DOUT/RDY, are referred to either by the entire pin name or
by a single function of the pin, for example, RDY, when only
that function is relevant.
Table 1. AD7124-8 Overview
Parameter
Low Power Mode
Mid Power Mode
Full Power Mode
Maximum Output Data Rate
2400 SPS
4800 SPS
19,200 SPS
RMS Noise (Gain = 128)
24 nV
20 nV
23 nV
Peak-to-Peak Resolution at 1200 SPS
(Gain = 1)
16.4 bits
17.1 bits
18 bits
Typical Current (ADC + PGA)
255 µA
355 µA
930 µA


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