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AD7891BP-1 Fiches technique(PDF) 7 Page - Analog Devices

No de pièce AD7891BP-1
Description  LC2MOS 8-Channel, 12-Bit High Speed Data Acquisition System
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Fabricant  AD [Analog Devices]
Site Internet  http://www.analog.com
Logo AD - Analog Devices

AD7891BP-1 Fiches technique(HTML) 7 Page - Analog Devices

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AD7891
–7–
REV. A
PIN FUNCTION DESCRIPTIONS
Mnemonic
Description
VINXA, VINXB
Analog Input Channels. The AD7891 contains eight pairs of analog input channels. Each channel con-
tains two input pins to allow a number of different input ranges to be used with the AD7891. There are
two possible input voltage ranges on the AD7891-1. The
±5 V input range is selected by connecting the
input voltage to both VINXA and VINXB, while the
±10 V input range is selected by applying the input
voltage to VINXA and connecting VINXB to AGND. The AD7891-2 has three possible input ranges. The
0 V to +2.5 V input range is selected by connecting the analog input voltage to both VINXA and VINXB; the
0 V to +5 V input range is selected by applying the input voltage to VINXA and connecting VINXB to AGND
while the
±2.5 V input range is selected by connecting the analog input voltage to V
INXA and connecting
VINXB to REF IN (provided this REF IN voltage comes from a low impedance source). The channel to be
converted is selected by the A2, A1 and A0 bits of the control register. In the parallel interface mode,
these bits are available as three data input lines (DB3 to DB5) in a parallel write operation while in the
serial interface mode, these three bits are accessed via the DATA IN line in a serial write operation. The
multiplexer has guaranteed break-before-make operation.
VDD
Positive supply voltage, +5 V
± 5%.
AGND
Analog Ground. Ground reference for track/hold, comparator and DAC.
DGND
Digital Ground. Ground reference for digital circuitry.
STANDBY
Standby Mode Input. TTL-compatible input which is used to put the device into the power save or
standby mode. The
STANDBY input is high for normal operation and low for standby operation.
REF OUT/REF IN
Voltage Reference Output/Input. The part can either be used with its own internal reference or with an
external reference source. The on-chip +2.5 V reference voltage is provided at this pin. When using this
internal reference as the reference source for the part, REF OUT should be decoupled to REF GND with
a 0.1
µF disc ceramic capacitor. The output impedance of the reference source is typically 2 kΩ. When
using an external reference source as the reference voltage for the part, the reference source should be
connected to this pin. This overdrives the internal reference and provides the reference source for the
part. The reference pin is buffered on-chip but must be able to sink or source current through this 2 k
resistor to the output of the on-chip reference. The nominal reference voltage for correct operation of the
AD7891 is +2.5 V.
REF GND
Reference Ground. Ground reference for the part’s on-chip reference buffer. The REF OUT pin of the
part should be decoupled with a 0.1
µF capacitor to this REF GND pin. If the AD7891 is used with an
external reference, the external reference should also be decoupled to this pin. The REF GND pin should
be connected to the AGND pin or the system’s AGND plane.
CONVST
Convert Start. Edge-triggered logic input. A low to high transition on this input puts the track/hold into
hold and initiates conversion. When changing channels on the part, sufficient time should be given for
multiplexer settling and track/hold acquisition between the channel change and the rising edge of
CONVST.
EOC
End-of-Conversion. Active low logic output indicating converter status. The end of conversion is signified
by a low-going pulse on this line. The duration of this
EOC pulse is nominally 80 ns.
MODE
Interface Mode. Control input which determines the interface mode for the part. With this pin at a logic
low, the AD7891 is in its serial interface mode; with this pin at a logic high, the device is in its parallel
interface mode.
NC
No Connect. The two NC pins on the device can be left unconnected. If they are to be connected to a
voltage it should be to ground potential. To ensure correct operation of the AD7891, neither of the NC
pins should be connected to a logic high potential.


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