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AD7771 Datasheet(PDF) 4 Page - Analog Devices

No. de pieza AD7771
Descripción Electrónicos  8-Ch, 24-Bit Simultaneous Sampling ADC
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Fabricante Electrónico  AD [Analog Devices]
Página de inicio  http://www.analog.com
Logo AD - Analog Devices

AD7771 Datasheet(HTML) 4 Page - Analog Devices

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Rev. PrC | Page 3 of 13
GENERAL DESCRIPTION
The AD7771 is an 8-channel simultaneously sampled, Analog-
to-Digital Converter. There are 8 full Sigma Delta ADCs on-
chip. The AD7771 provides a high input impedance to allow for
direct sensor connection. Each input channel has a
programmable gain stage catering for gains of 1,2,4,8 to map
lower amplitude sensor outputs into the Full Scale ADC input
range to maximize the Dynamic Range of the signal chain. The
Analog inputs can accept unipolar 0 to 2.4V or true bipolar
±1.25V analog input signals with 3.3V or ±1.65V Analog
Supply voltages respectively. The Analog inputs can be
configured to accept True Differential or Single-Ended signals
to match different sensor output configurations.
Each channel contains an ADC modulator and Sinc 3/Sinc 5
low latency digital filters. A Sample Rate Converter (SRC) is
provided to allow fine resolution control over the AD7771
Output Data Rate (ODR). This can be used in Power Quality
Applications where the ODR resolution is required to maintain
coherency with 0.01Hz changes in the line frequency. The SRC
can be programmed through the SPI interface. The AD7771
implements two different interfaces, Data Output Interface and
a SPI control Interface. The ADC Data Output interface is
dedicated to transmitting the ADC conversion results from the
AD7771 to the processor, acting as a master. The SPI interface
is used to write to and read from the AD7771 configuration
registers and for the control and reading of data from the SAR
ADC. The SPI interface can also be configure to output the
sigma delta conversion data.
The AD7771 includes a 12-Bit SAR ADC. This ADC can be
used for AD7771 diagnostics without having to decommission
one of the Sigma Delta ADC channels dedicated to system
measurement functions. With the use of an external multiplexer
and signal conditioning, the SAR ADC can be used to validate
the Sigma Delta ADC measurements in applications where
Functional Safety is required. In addition, the AD7771 offers
three GPIOs that can be used to control an external multiplexer.
The AD7771 contains a 2.5V reference and reference buffer.
The reference has a temperature co-efficient of 20 ppm/°C max.
The AD7771 offers two modes of operation: High Resolution
Mode and Low Power Mode. The High Resolution mode
provides higher dynamic range while consuming 13 mW/ch
and the Low Power mode consumes just 5 mW/ch at a reduced
dynamic range specification.
The specified operating temperature range is -40°C to +105°C
while the part is operational up to +125°C.
Input referred noise for SINC 3 and SINC5 filters,
SINC5
ODR BW
Gain1(uVrms/uVpp) Gain2(uVrms/uVpp) Gain4(uVrms/uVpp) Gain8(uVrms/uVpp)
128k
26098
30.20
22.80
19.20
17.20
64k
14122
13.70
10.10
8.28
7.46
32k
7215
7.40
4.79
3.63
3.14
16k
3627.5
4.65
2.74
1.87
1.54
8k
1816.2
3.17
1.79
1.17
0.93
4k
908.5
2.23
1.25
0.79
0.63
SINC3
ODR BW
Gain1(uVrms/uVpp) Gain2(uVrms/uVpp) Gain4(uVrms/uVpp) Gain8(uVrms/uVpp)
32k
10045
11.91
7.00
4.79
3.84
16k
5076.2
5.60
3.35
2.37
1.99
8k
2545
3.64
2.10
1.42
1.15
4k
1273.5
2.51
1.42
0.93
0.74
2k
636.75
1.77
0.99
0.64
0.51
1k
318.5
1.25
0.71
0.45
0.36
Preliminary Technical Data
AD7771


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