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AD7938BCPZ-6 데이터시트(PDF) 8 Page - Analog Devices

부품명 AD7938BCPZ-6
상세설명  8-Channel, 625 kSPS, 12-Bit Parallel ADCs with a Sequencer
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AD7938-6
Rev. 0 | Page 8 of 32
Pin No
Mnemonic
Function
21
AGND
Analog Ground. This is the ground reference point for all analog circuitry on the AD7938-6. 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.
22
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 this appears at this pin. 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.
23 to 30
VIN0 to VIN7
Analog Input 0 to Analog Input 7. Eight analog input channels that are multiplexed into the on-chip track-and-
hold. The analog inputs can be programmed to be eight single-ended inputs, four fully differential pairs, four
pseudo-differential pairs, or seven pseudo-differential inputs by setting the MODE bits in the control register
appropriately (see Table 8). The analog input channel to be converted can either be selected by writing to the
address bits (ADD2 to ADD0) in the control register prior to the conversion or the on-chip sequencer can be
used. The SEQ and SHDW bits in conjunction with the address bits in the control register allow the shadow
register to be programmed. The input range for all input channels can either be 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.
31
VDD
Power Supply Input. The VDD range for the AD7938-6 is 2.7 V to 5.25 V. The supply should be decoupled to
AGND with a 0.1 µF capacitor and a 10 µF tantalum capacitor.
32
W/B
Word/Byte Input. When this input is logic high, data is transferred to and from the AD7938-6 in 12-bit words on
Pins DB0 to DB11. When this pin is logic low, byte transfer mode is enabled. Data and the channel ID are
transferred on Pins DB0 to DB7, and Pin DB8/HBEN assumes its HBEN functionality. Unused data lines when
operating in byte transfer mode should be tied off to DGND.


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