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| 型號： | AD7998BRU-1REEL |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | ADC |
| 英文描述： | 8-Channel, 10- and 12-Bit ADCs with I2CCompatible |
| 中文描述： | 8-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO20 |
| 封裝： | MO-153-AC, TSSOP-20 |
| 文件頁數(shù)： | 10/32頁 |
| 文件大小： | 1056K |
| 代理商： | AD7998BRU-1REEL |
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AD7997/AD7998
PIN CONFIGURATION AND PIN FUNCTION DESCRIPTIONS
Rev. 0 | Page 10 of 32
AD7997/
AD7998
TOP VIEW
5
(Not to Scale)
1
2
3
4
17
18
19
20
SDA
ALERT/BUSY
CONVST
SCL
V
DD
AGND
V
DD
AGND
AGND
V
IN
4
V
IN
6
14
13
V
IN
2
16
15
AS
AGND
REF
IN
V
IN
1
V
IN
3
V
IN
5
V
IN
7
6
7
8
9
10
V
IN
8
12
11
0
Figure 3. AD7998/AD7997 Pin Configuration
Table 5. Pin Function Descriptions
Pin No.
Mnemonic
1, 3,
4, 20
2, 5
V
DD
6
REF
IN
Function
Analog Ground. Ground reference point for all circuitry on the AD7997/AD7998. All analog input signals should be
referred to this AGND voltage.
Power Supply Input. The V
DD
range for the AD7997/AD7998 is from 2.7 V to 5.5 V.
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 V
DD
. A 0.1 μF and 1 μF capacitors should be placed between REF
IN
and AGND. See Typical Connection Diagram.
Analog Input 1. Single-ended analog input channel. The input range is 0 V to REF
IN
.
Analog Input 3. Single-ended analog input channel. The input range is 0 V to REF
IN
.
Analog Input 5. Single-ended analog input channel. The input range is 0 V to REF
IN
.
Analog Input 7. Single-ended analog input channel. The input range is 0 V to REF
IN
.
Analog Input 8. Single-ended analog input channel. The input range is 0 V to REF
IN
.
Analog Input 6. Single-ended analog input channel. The input range is 0 V to REF
IN
.
Analog Input 4. Single-ended analog input channel. The input range is 0 V to REF
IN
.
Analog Input 2. Single-ended analog input channel. The input range is 0 V to REF
IN
.
Logic Input. Address select input that selects one of three I
2
C addresses for the AD7997/AD7998, as shown in Table
6
.
The device address depends on the voltage applied to this pin.
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).
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.
Digital I/O. Serial bus bidirectional data. Open-drain output. External pull-up resistor required.
Digital Input. Serial bus clock. Open-drain input. External pull-up resistor required.
AGND
7
8
9
10
11
12
13
14
15
V
IN
1
V
IN
3
V
IN
5
V
IN
7
V
IN
8
V
IN
6
V
IN
4
V
IN
2
AS
16
CONVST
17
ALERT/BUSY
18
19
Table 6. I
2
C Address Selection
Part Number
AD7997-0
AD7997-0
AD7997-1
AD7997-1
AD7997-x
1
AD7998-0
AD7998-0
AD7998-1
AD7998-1
AD7998-x
1
SDA
SCL
AS Pin
AGND
V
DD
AGND
V
DD
Float
AGND
V
DD
AGND
V
DD
Float
I
2
C Address
010 0001
010 0010
010 0011
010 0100
010 0000
010 0001
010 0010
010 0011
010 0100
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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