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參數資料
| 型號： | AD7998BRUZ-1REEL3 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 8-Channel, 10- and 12-Bit ADCs with I2CCompatible |
| 中文描述： | 8通道，10 -和12位ADC與I2CCompatible |
| 文件頁數： | 16/32頁 |
| 文件大小： | 1056K |
| 代理商： | AD7998BRUZ-1REEL3 |
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AD7997/AD7998
TYPICAL CONNECTION DIAGRAM
The typical connection diagram for the AD7997/AD7998 is
shown in Figure 22. In this figure, the address select pin (AS)
is tied to V
DD
; however, AS can also be tied to AGND or left
floating, allowing the user to select up to five AD7997/AD7998
devices on the same serial bus. An external reference must be
applied to the AD7997/AD7998. This reference can be in the
range of 1.2 V to V
DD
. A precision reference like the REF 19x
family, AD780, ADR03, or ADR381 can be used to supply the
reference voltage to the ADC.
Rev. 0 | Page 16 of 32
SDA and SCL form the 2-wire I
2
C-/SMBus-compatible
interface. External pull-up resisters are required for both SDA
and SCL lines.
The AD7998-0/AD7997-0 support standard and fast I
2
C
interface modes. The AD7998-1/AD7997-1 support standard,
fast, and high speed I
2
C interface modes. Therefore if operating
in either standard or fast mode, up to five AD7997/AD7998
devices can be connected to the bus, as noted:
3 × AD7997-0/AD7998-0 and 2 × AD7997-1/ AD7998-1
or
3 × AD7997-1/AD7998-1 and 2 × AD7997-0/AD7998-0
In high speed mode, up to three AD7997-1/AD7998-1 devices
can be connected to the bus.
Wake-up from shutdown and acquisition prior to a conversion
is approximately 1 μs, and conversion time is approximately
2 μs. The AD7997/AD7998 enters shutdown mode again after
each conversion, which is useful in applications where power
consumption is a concern.
ANALOG INPUT
Figure 21 shows an equivalent circuit of the AD7997/AD7998
analog input structure. The two diodes, D1 and D2, provide
ESD protection for the analog inputs. Care must be taken to
ensure that the analog input signal does not exceed the supply
rails by more than 300 mV. This causes the diodes to become
forward biased and start conducting current into the substrate.
These diodes can conduct a maximum current of 10 mA
without causing irreversible damage to the part.
V
IN
D1
V
DD
D2
R1
C2
30pF
C1
4pF
CONVERSION PHASE—SWITCH OPEN
TRACK PHASE—SWITCH CLOSED
0
Figure 21. Equivalent Analog Input Circuit
Capacitor C1 in Figure 21 is typically about 4 pF and can
primarily be attributed to pin capacitance. Resistor R1 is a
lumped component made up of the on resistance (R
ON
) of
a track-and-hold switch, and also includes the R
ON
of the
input multiplexer. The total resistance is typically about 400 .
C2, the ADC sampling capacitor, has a typical capacitance of
30 pF.
V
DD
V
IN
1
AGND
5V SUPPLY
REF 19x
1
μ
F
0.1
μ
F
10
μ
F
AD7997/
AD7998
0V to REF
IN
INPUT
SDA
μ
C/
μ
P
SCL
2-WIRE SERIAL
INTERFACE
CONVST
ALERT
REF
IN
R
P
R
P
R
P
V
DD
AS
V
IN
8
0
0.1
μ
F
Figure 22. AD7997/AD7998 Typical Connection Diagram
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