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AD7664AST Folha de dados(PDF) 11 Page - Analog Devices

Nome de Peças AD7664AST
Descrição Electrónicos  16-Bit, 570 kSPS CMOS ADC
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Fabricante Electrônico  AD [Analog Devices]
Página de início  http://www.analog.com
Logo AD - Analog Devices

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AD7664
–11–
Table I. Output Codes and Ideal Input Voltages
Digital Output Code
Hexa
Analog
Straight
Two’s
Description
Input
Binary
Complement
FSR –1 LSB
2.499962 V
FFFF
1
7FFF
1
FSR – 2 LSB
2.499923 V
FFFE
7FFE
Midscale + 1 LSB
1.250038 V
8001
0001
Midscale
1.25 V
8000
0000
Midscale – 1 LSB
1.249962 V
7FFF
FFFF
–FSR + 1 LSB
38
µV
0001
8001
–FSR
0 V
0000
2
8000
2
NOTES
1This is also the code for overrange analog input (V
IN – VINGND above
VREF – VREFGND).
2This is also the code for underrange analog input (V
IN below VINGND)
TYPICAL CONNECTION DIAGRAM
Figure 5 shows a typical connection diagram for the AD7664.
Analog Input
Figure 6 shows an equivalent circuit of the input structure of
the AD7664.
C2
R1
D1
D2
C1
IN
OR INGND
AGND
AVDD
Figure 6. Equivalent Analog Input Circuit
The two diodes D1 and D2 provide ESD protection for the
analog inputs IN and INGND. Care must be taken to ensure
that the analog input signal never exceeds the supply rails by more
than 0.3 V. This will cause these diodes to become forward-
biased and start conducting current. These diodes can handle
a forward-biased current of 100 mA maximum. For instance,
these conditions could eventually occur when the input buffer’s
(U1) supplies are different from AVDD. In such case, an input
buffer with a short circuit current limitation can be used to
protect the part.
100nF
10 F
100nF
10 F
AVDD
10 F
100nF
AGND
DGND
DVDD
OVDD
OGND
WARP
IMPULSE
SER/
PAR
CNVST
BUSY
SDOUT
SCLK
RD
CS
RESET
PD
IN
INGND
REFGND
100nF
CREF1
2.5V REF1
REF
100
D3
CLOCK
AD7664
ANALOG INPUT
(0V TO 2.5V)
C/ P/DSP
SERIAL
PORT
DIGITAL SUPPLY
(3.3V OR 5V)
ANALOG
SUPPLY
(5V)
NOTES:
1 THE AD780 IS RECOMMENDED WITH C
REF = 47 F.
2 THE AD829 IS RECOMMENDED WITH A COMPENSATION CAPACITOR C
C = 82 pF, TYPE CERAMIC NPO.
3 OPTIONAL LOW JITTER CNVST.
DVDD
CC
OB/
2C
2.7nF
U12
15
Figure 5. Typical Connection Diagram


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