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AD7934BRU-6REEL7 Arkusz danych(PDF) 8 Page - Analog Devices

Numer części AD7934BRU-6REEL7
Szczegółowy opis  4-Channel, 625 kSPS, 12-Bit Parallel ADC with a Sequencer
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Strona internetowa  http://www.analog.com
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AD7934BRU-6REEL7 Arkusz danych(HTML) 8 Page - Analog Devices

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AD7934-6
Rev. A | Page 8 of 28
Pin No.
Mnemonic
Description
21
RD
Read Input. Active low logic input used in conjunction with CS to access the conversion result. The conversion
result is placed on the data bus following the falling edge of RD read while CS is low.
22
CS
Chip Select. Active low logic input used in conjunction with RD and WR to read conversion data or write data
to the control register.
23
AGND
Analog Ground. This is the ground reference point for all analog circuitry on the AD7934-6. All analog input
signals and any external reference signal should be referred to this AGND voltage. The AGND and DGND
voltages should ideally be at the same potential and must not be more than 0.3 V apart, even on a transient
basis.
24
VREFIN/VREFOUT
Reference Input/Output. This pin is connected to the internal reference, and is the reference source for the
ADC. The nominal internal reference voltage is 2.5 V, and it appears at this pin. It is recommended that this pin
be decoupled to AGND with a 470 nF capacitor. This pin can be overdriven by an external reference. The input
voltage range for the external reference is 0.1 V to VDD; however, care must be taken to ensure that the analog
input range does not exceed VDD + 0.3 V. See the Reference Section.
25 to 28
VIN0 to VIN3
Analog Input 0 to Analog Input 3. Four analog input channels that are multiplexed into the on-chip track-and-
hold. The analog inputs can be programmed to be four single-ended inputs, two fully differential pairs, or two
pseudo differential pairs by setting the MODE bits in the control register appropriately (see Table 9). The
analog input channel to be converted can be selected either by writing to the address bits (ADD1 and ADD0)
in the control register prior to the conversion, or by using the on-chip sequencer. The input range for all input
channels can be either 0 V to VREF, or 0 V to 2 × VREF, and the coding can be binary or twos complement,
depending on the states of the RANGE and CODING bits in the control register. Any unused input channels
should be connected to AGND to avoid noise pickup.


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