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AD7918BRU-REEL Folha de dados(PDF) 10 Page - Analog Devices

Nome de Peças AD7918BRU-REEL
Descrição Electrónicos  8-Channel, 1 MSPS, 8-/10-/12-Bit ADCs with Sequencer in 20-Lead TSSOP
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Fabricante Electrônico  AD [Analog Devices]
Página de início  http://www.analog.com
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AD7908/AD7918/AD7928
REV. A
PIN FUNCTION DESCRIPTIONS
Pin No.
Mnemonic
Function
1
SCLK
Serial Clock. Logic input. SCLK provides the serial clock for accessing data from the part. This clock
input is also used as the clock source for the AD7908/AD7918/AD7928’s conversion process.
2DIN
Data In. Logic input. Data to be written to the AD7908/AD7918/AD7928’s Control Register is provided on
this input and is clocked into the register on the falling edge of SCLK (see the Control Register section).
3
CS
Chip Select. Active low logic input. This input provides the dual function of initiating conversions on
the AD7908/AD7918/AD7928, and also frames the serial data transfer.
4, 8, 17, 20
AGND
Analog Ground. Ground reference point for all analog circuitry on the AD7908/AD7918/AD7928.
All analog input signals and any external reference signal should be referred to this AGND voltage.
All AGND pins should be connected together.
5, 6
AVDD
Analog Power Supply Input. The AVDD range for the AD7908/AD7918/AD7928 is from 2.7 V to 5.25 V.
For the 0 V to 2
REFIN range, AVDD should be from 4.75 V to 5.25 V.
7
REFIN
Reference Input for the AD7908/AD7918/AD7928. An external reference must be applied to this input.
The voltage range for the external reference is 2.5 V ± 1% for specified performance.
16–9VIN0–VIN7Analog Input 0 through Analog Input 7. Eight single-ended analog input channels that are multiplexed
into the on-chip track-and-hold. The analog input channel to be converted is selected by using the
address bits ADD2 through ADD0 of the Control Register. The address bits, in conjunction with the SEQ
and SHADOW bits, allow the Sequencer to be programmed. The input range for all input channels
can extend from 0 V to REFIN or 0 V to 2
REFIN as selected via the RANGE bit in the Control
Register. Any unused input channels must be connected to AGND to avoid noise pickup.
18
DOUT
Data Out. Logic output. The conversion result from the AD7908/AD7918/AD7928 is provided on
this output as a serial data stream. The bits are clocked out on the falling edge of the SCLK input. The
data stream from the AD7908 consists of one leading zero, three address bits indicating which channel
the conversion result corresponds to, followed by the eight bits of conversion data, followed by four
trailing zeros, provided MSB first; the data stream from the AD7918 consists of one leading zero,
three address bits indicating which channel the conversion result corresponds to, followed by the 10 bits
of conversion data, followed by two trailing zeros, also provided MSB first; the data stream from the
AD7928 consists of one leading zero, three address bits indicating which channel the conversion result
corresponds to, followed by the 12 bits of conversion data, provided MSB first. The output coding
may be selected as straight binary or twos complement via the CODING bit in the Control Register.
19
VDRIVE
Logic Power Supply Input. The voltage supplied at this pin determines at what voltage the serial
interface of the AD7908/AD7918/AD7928 will operate.
PIN CONFIGURATION
20-Lead TSSOP
1
AD7908/
AD7918/
AD7928
SCLK
AGND
20
TOP VIEW
(Not to Scale)
2
DIN
VDRIVE
19
3
CS
DOUT
18
4
AGND
AGND
17
5
AVDD
VIN0
16
6
AVDD
VIN1
15
7
REFIN
VIN2
14
8
AGND
VIN3
13
9
VIN7VIN4
12
10
VIN6VIN5
11
–10–


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