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AD7940BRM Folha de dados(PDF) 7 Page - Analog Devices

Nome de Peças AD7940BRM
Descrição Electrónicos  3mW, 100kSPS, 14-Bit ADC in 6-Lead SOT-23
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Fabricante Electrônico  AD [Analog Devices]
Página de início  http://www.analog.com
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AD7940
Rev. 0 | Page 7 of 20
PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS
CS
SDATA
SCLK
6
5
4
VDD 1
GND
2
VIN 3
AD7940
TOP VIEW
(Not to Scale)
SOT-23
Figure 3. SOT-23 Pin Configuration
NC = NO CONNECT
AD7490
MSOP
TOP VIEW
(Not to Scale)
VDD 1
GND
2
GND
3
VIN 4
CS
SDATA
NC
SCLK
8
7
6
5
Figure 4. MSOP Pin Configuration
Table 5. Pin Function Descriptions
Pin No.
SOT-23
Pin No.
MSOP
Mnemonic
Function
1
1
VDD
Power Supply Input. The VDD range for the AD7940 is from 2.5 V to 5.5 V.
2
2, 3
GND
Analog Ground. Ground reference point for all circuitry on the AD7940. All analog input signals should
be referred to this GND voltage.
3
4
VIN
Analog Input. Single-ended analog input channel. The input range is 0 V to VDD.
4
5
SCLK
Serial Clock. Logic input. SCLK provides the serial clock for accessing data from this part. This clock
input is also used as the clock source for the AD7940's conversion process.
5
7
SDATA
Data Out. Logic output. The conversion result from the AD7940 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
AD7940 consists of two leading zeros followed by 14 bits of conversion data that are provided MSB
first. This will be followed by four trailing zeroes if CS is held low for a total of 24 SCLK cycles. See the
Serial Interface section.
6
8
CS
Chip Select. Active low logic input. This input provides the dual function of initiating conversions on
the AD7940 and framing the serial data transfer.
N/A
6
NC
No Connect. This pin should be left unconnected.


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