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AD7998BRUZ-1REEL3 датащи(PDF) 10 Page - Analog Devices

номер детали AD7998BRUZ-1REEL3
подробное описание детали  8-Channel, 10- and 12-Bit ADCs with I2CCompatible
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производитель  AD [Analog Devices]
домашняя страница  http://www.analog.com
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AD7998BRUZ-1REEL3 датащи(HTML) 10 Page - Analog Devices

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AD7997/AD7998
Rev. 0 | Page 10 of 32
PIN CONFIGURATION AND PIN FUNCTION DESCRIPTIONS
AD7997/
AD7998
TOP VIEW
1
2
3
4
17
18
19
20
SDA
SCL
VDD
AGND
VIN4
14
13
VIN2
5
(Not to Scale)
ALERT/BUSY
16
VDD
15
AS
AGND
REFIN
6
VIN1
7
VIN3
8
AGND
AGND
VIN5
9
VIN7 10
VIN8
12
11
VIN6
CONVST
Figure 3. AD7998/AD7997 Pin Configuration
Table 5. Pin Function Descriptions
Pin No.
Mnemonic
Function
1, 3,
4, 20
AGND
Analog Ground. Ground reference point for all circuitry on the AD7997/AD7998. All analog input signals should be
referred to this AGND voltage.
2, 5
VDD
Power Supply Input. The VDD range for the AD7997/AD7998 is from 2.7 V to 5.5 V.
6
REFIN
Voltage Reference Input. The external reference for the AD7997/AD7998 should be applied to this input pin. The
voltage range for the external reference is 1.2 V to VDD. A 0.1 µF and 1 µF capacitors should be placed between REFIN
and AGND. See Typical Connection Diagram.
7
VIN1
Analog Input 1. Single-ended analog input channel. The input range is 0 V to REFIN.
8
VIN3
Analog Input 3. Single-ended analog input channel. The input range is 0 V to REFIN.
9
VIN5
Analog Input 5. Single-ended analog input channel. The input range is 0 V to REFIN.
10
VIN7
Analog Input 7. Single-ended analog input channel. The input range is 0 V to REFIN.
11
VIN8
Analog Input 8. Single-ended analog input channel. The input range is 0 V to REFIN.
12
VIN6
Analog Input 6. Single-ended analog input channel. The input range is 0 V to REFIN.
13
VIN4
Analog Input 4. Single-ended analog input channel. The input range is 0 V to REFIN.
14
VIN2
Analog Input 2. Single-ended analog input channel. The input range is 0 V to REFIN.
15
AS
Logic Input. Address select input that selects one of three I2C addresses for the AD7997/AD7998, as shown in Table
6.
The device address depends on the voltage applied to this pin.
16
CONVST
Logic Input Signal. Convert start signal. This is an edge-triggered logic input. The rising edge of this signal powers up
the part. The power-up time for the part is 1 µs. The falling edge of CONVST places the track/hold into hold mode and
initiates a conversion. A power-up time of at least 1 µs must be allowed for the CONVST high pulse; otherwise, the
conversion result is invalid (see the Modes of Operation section).
17
ALERT/BUSY
Digital Output. Selectable as an ALERT or BUSY output function. When configured as an ALERT, this pin acts as an out-
of-range indicator and, if enabled, becomes active when the conversion result violates the DATAHIGH or DATALOW
register values. See the Limit Registers section. When configured as a BUSY output, this pin becomes active when a
conversion is in progress. Open-drain output.
18
SDA
Digital I/O. Serial bus bidirectional data. Open-drain output. External pull-up resistor required.
19
SCL
Digital Input. Serial bus clock. Open-drain input. External pull-up resistor required.
Table 6. I2C Address Selection
Part Number
AS Pin
I2C Address
AD7997-0
AGND
010 0001
AD7997-0
VDD
010 0010
AD7997-1
AGND
010 0011
AD7997-1
VDD
010 0100
AD7997-x1
Float
010 0000
AD7998-0
AGND
010 0001
AD7998-0
VDD
010 0010
AD7998-1
AGND
010 0011
AD7998-1
VDD
010 0100
AD7998-x1
Float
010 0000
1 If the AS pin is left floating on any of the AD7997/AD7998 parts, the device address is 010 0000.


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