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AD7703SQ Datasheet(PDF) 6 Page - Analog Devices

No. de pieza AD7703SQ
Descripción Electrónicos  LC2MOS 20-Bit A/D Converter
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Fabricante Electrónico  AD [Analog Devices]
Página de inicio  http://www.analog.com
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AD7703SQ Datasheet(HTML) 6 Page - Analog Devices

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AD7703
–6–
REV. D
PIN FUNCTION DESCRIPTION
Pin
Mnemonic
Description
1
MODE
Selects the Serial Interface Mode. If MODE is tied to DGND, the Synchronous External Clocking (SEC)
mode is selected. SCLK is configured as an input, and the output appears without formatting, the MSB com-
ing first. If MODE is tied to +5 V, the AD7703 operates in the Synchronous Self-Clocking (SSC) mode.
SCLK is configured as an output, with a clock frequency for fCLKIN/4 and 25% duty cycle.
2
CLKOUT
Clock Output to generate an Internal Master Clock by connecting a crystal between CLKOUT and CLKIN.
If an external clock is used, CLKOUT is not connected.
3
CLKIN
Clock Input for External Clock.
4, 17
SC1, SC2
System Calibration Pins. The state of these pins, when CAL is taken high, determines the type of calibration
performed.
5
DGND
Digital Ground. Ground reference for all digital signals.
6DVSS
Digital Negative Supply, –5 V nominal.
7AVSS
Analog Negative Supply, –5 V nominal.
8
AGND
Analog Ground. Ground reference for all analog signals.
9AIN
Analog Input.
10
VREF
Voltage Reference Input, +2.5 V nominal. This determines the value of positive full-scale in the unipolar
mode and of both positive and negative full-scale in the Bipolar Mode.
11
SLEEP
Sleep mode pin. When this pin is taken low, the AD7703 goes into a low-power mode with typically 10
µW
power consumption.
12
BP/UP
Bipolar/Unipolar mode pin. When this pin is Low, the AD7703 is configured for a unipolar input range going
from AGND to VREF. When Pin 12 is High, the AD7703 is configured for a bipolar input range,
±V
REF.
13
CAL
Calibration mode pin. When CAL is taken High for more than 4 cycles, the AD7703 is reset and performs a
calibration cycle when CAL is brought Low again. The CAL pin can also be used as a strobe to synchronize
the operation of several AD7703s.
14
AVDD
Analog Positive Supply, +5 V nominal.
15
DVDD
Digital Positive Supply, +5 V nominal.
16
CS
Chip Select Input. When CS is brought low, the AD7703 will begin to transmit serial data in a format deter-
mined by the state of the MODE pin.
18
DRDY
Data Ready Output. DRDY is low when valid data is available in the output register. It goes high after trans-
mission of a word is completed. It also goes high for four clock cycles when a new data word is being loaded
into the output register, to indicate that valid data is not available, irrespective of whether data transmission is
complete or not.
19
SCLK
Serial Clock Input/Output. The SCLK pin in configured as an input or output, dependent on the type of se-
rial data transmission that has been selected by the MODE pin. When configured as an output in the Syn-
chronous Self-Clocking mode, it has a frequency of fCLKIN/4 and a duty cycle of 25%.
20
SDATA
Serial Data Output. The AD7703’s output data is available at this pin as a 20-bit serial word.
Table I. Bit Weight Table (2.5 V Reference Voltage)
UNIPOLAR MODE
BIPOLAR MODE
V
LSBs
% FS
ppm FS LSBs
% FS
ppm FS
0.596
0.25
0.0000238
0.24
0.13
0.0000119
0.12
1.192
0.5
0.0000477
0.48
0.26
0.0000238
0.24
2.384
1.00
0.0000954
0.95
0.5
0.0000477
0.48
4.768
2.00
0.0001907
1.91
1.00
0.0000954
0.95
9.537
4.00
0.0003814
3.81
2.00
0.0001907
1.91
PIN CONFIGURATION
DIP, Cerdip, SOIC
MODE
SC1
DGND
CLKOUT
CLKIN
AGND
DVSS
AVSS
AIN
VREF
SDATA
SCLK
SC2
CAL
AVDD
DVDD
DRDY
CS
BP/UP
SLEEP
TOP VIEW
(Not to Scale)
AD7703
1
2
3
4
5
6
7
8
9
10
14
13
12
11
20
19
18
17
16
15


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