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參數(shù)資料
| 型號： | EVAL-AD7992EBZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 7/29頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD EVALUATION FOR AD7992 |
| 標準包裝： | 1 |
| ADC 的數(shù)量： | 1 |
| 位數(shù)： | 12 |
| 采樣率（每秒）： | 188k |
| 數(shù)據(jù)接口： | I²C，串行 |
| 輸入范圍： | 0 ~ VREF |
| 在以下條件下的電源（標準）： | 7.7mW @ 188kSPS，5.5 V |
| 工作溫度： | -40°C ~ 125°C |
| 已用 IC / 零件： | AD7992 |
| 已供物品： | 板，線纜 |
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AD7992
Rev. 0 | Page 14 of 28
TYPICAL CONNECTION DIAGRAM
Figure 21 shows the typical connection diagram for the
however AS can also be tied to AGND or left floating, allowing
the user to select up to five AD7992 devices on the same serial
bus. An external reference must be applied to the AD7992.
This reference can be in the range of 1.2 V to VDD. A precision
reference like the REF 19x family, ADR03, or ADR381 can be
used to supply the reference voltage to the ADC. The AD7992
can be configured to be a single-channel device with the
reference voltage applied to the VIN2/REFIN pin. The AD7992
can also be configured as a dual-channel device where the
reference voltage is taken from the supply voltage VDD, and the
VIN2/REFIN takes on its analog input function,VIN2.
SDA and SCL form the 2-wire I2C/SMBus-compatible interface.
External pull-up resisters are required for both SDA and SCL
lines.
The AD7992-0 supports standard and fast I2C interface modes.
The AD7992-1 supports standard, fast, and high speed I2C
interface modes. Therefore, if operating the AD7992 in either
standard or fast mode, up to five AD7992 devices can be
connected to the bus (3 × AD7992-0 and 2 × AD7992-1 or
3 × AD7992-1 and 2 × AD7992-0). In high speed mode, up to
three AD7992-1 devices can be connected to the bus.
Wake up from power-down prior to a conversion is approx-
imately 1 s, and conversion time is approximately 2 s. The
AD7992 enters shutdown mode again after each conversion,
which is useful in applications where power consumption is a
concern.
ANALOG INPUT
Figure 20 shows an equivalent circuit of the AD7992 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 these 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.
VIN
D1
VDD
D2
R1
C2
30pF
C1
4pF
CONVERSION PHASE - SWITCH OPEN
TRACK PHASE - SWITCH CLOSED
03473-0-022
Figure 20. Equivalent Analog Input Circuit
Capacitor C1 in Figure 20 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 (RON) of
a track-and-hold switch, and also the RON of the input multi-
plexer. The total resistor is typically about 400 . C2, the ADC
sampling capacitor, has a typical capacitance of 30 pF.
VDD
VIN1
GND
5V SUPPLY
REF 19x
1
F
0.1
F
10
F
AD7992
0V to REFIN
INPUT
SDA
C/P
SCL
2-WIRE SERIAL
INTERFACE
CONVST
ALERT
VIN2/REFIN
RP
SET TO REQUIRED
ADDRESS
AS
03263-0-004
0.1
F
Figure 21. AD7992 Typical Connection Diagram, Single-Channel Mode, Mode 1
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| EVAL-AD7993EBZ | 功能描述:BOARD EVAL FOR AD7993 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - 模數(shù)轉換器 (ADC) 系列:- 產品培訓模塊:Obsolescence Mitigation Program 標準包裝:1 系列:- ADC 的數(shù)量:1 位數(shù):12 采樣率（每秒）:94.4k 數(shù)據(jù)接口:USB 輸入范圍:±VREF/2 在以下條件下的電源（標準）:- 工作溫度:-40°C ~ 85°C 已用 IC / 零件:MAX11645 已供物品:板，軟件 |
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