參數(shù)資料
型號： AD7746ARUZ
廠商： Analog Devices Inc
文件頁數(shù)： 26/28頁
文件大?。?/td> 0K
描述： IC CONV 2CH CAP TO DGTL 16-TSSOP
設(shè)計(jì)資源： Extending the Capacitive Input Range of AD7745/AD7746 (CN0129)
標(biāo)準(zhǔn)包裝： 96
類型： 電容數(shù)字轉(zhuǎn)換器
分辨率（位）： 24 b
數(shù)據(jù)接口： 串行
電壓電源： 單電源
電源電壓： 2.7 V ~ 5.25 V
工作溫度： -40°C ~ 125°C
安裝類型： 表面貼裝
封裝/外殼： 16-TSSOP（0.173"，4.40mm 寬）
供應(yīng)商設(shè)備封裝： 16-TSSOP
包裝： 管件
產(chǎn)品目錄頁面： 781 (CN2011-ZH PDF)
配用： EVAL-AD7746EBZ-ND - BOARD EVALUATION FOR AD7746
AD7745/AD7746
Rev. 0| Page 7 of 28
PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
AD7745
TOP VIEW
(Not to Scale)
SCL
EXCA
EXCB
REFIN(+)
REFIN(–)
CIN1(–)
CIN1(+)
RDY
SDA
VDD
GND
VIN(–)
VIN(+)
NC
NC = NO CONNECT
05468-004
Figure 4. AD7745 Pin Configuration (16-Lead TSSOP)
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
AD7746
TOP VIEW
(Not to Scale)
SCL
EXCA
EXCB
REFIN(+)
REFIN(–)
CIN1(–)
CIN1(+)
RDY
SDA
VDD
GND
VIN(–)
VIN(+)
CIN2(–)
CIN2(+)
NC
NC = NO CONNECT
05468-005
Figure 5. AD7746 Pin Configuration (16-Lead TSSOP)
Table 4. Pin Function Descriptions
Pin No.
Mnemonic
Description
1
SCL
Serial Interface Clock Input. Connects to the master clock line. Requires pull-up resistor if not already
provided in the system.
2
RDY
Logic Output. A falling edge on this output indicates that a conversion on enabled channel(s) has been
finished and the new data is available. Alternatively, the status register can be read via the 2-wire serial
interface and the relevant bit(s) decoded to query the finished conversion. If not used, this pin should be left
as an open circuit.
3, 4
EXCA, EXCB
CDC Excitation Outputs. The measured capacitance is connected between one of the EXC pins and one of the
CIN pins. If not used, these pins should be left as an open circuit.
5, 6
REFIN(+),
REFIN(–)
Differential Voltage Reference Input for the Voltage Channel (ADC). Alternatively, the on-chip internal
reference can be used for the voltage channel. These reference input pins are not used for conversion on
capacitive channel(s) (CDC). If not used, these pins can be left as an open circuit or connected to GND.
7
CIN1(–)
CDC Negative Capacitive Input in Differential Mode. This pin is internally disconnected in single-ended CDC
configuration. If not used, this pin can be left as an open circuit or connected to GND.
8
CIN1(+)
CDC Capacitive Input (in Single-Ended Mode) or Positive Capacitive Input (in Differential Mode). The
measured capacitance is connected between one of the EXC pins and one of the CIN pins. If not used, this pin
can be left as an open circuit or connected to GND.
9, 10
(AD7745)
NC
Not Connected. This pin should be left as an open circuit.
9
(AD7746)
CIN2(+)
CDC Second Capacitive Input (in Single-Ended Mode) or Positive Capacitive Input (in Differential Mode). If not
used, this pin can be left open circuit or connected to GND.
10
(AD7746)
CIN2(–)
CDC Negative Capacitive Input in Differential Mode. This pin is internally disconnected in a single-ended CDC
configuration. If not used, this pin can be left as an open circuit or connected to GND.
11, 12
VIN(+), VIN(–)
Differential Voltage Input for the Voltage Channel (ADC). These pins are also used to connect an external
temperature sensing diode. If not used, these pins can be left as an open circuit or connected to GND.
13
GND
Ground Pin.
14
VDD
Power Supply Voltage. This pin should be decoupled to GND, using a low impedance capacitor, for example
in combination with a 10 F tantalum and a 0.1 F multilayer ceramic.
15
NC
Not Connected. This pin should be left as an open circuit.
16
SDA
Serial Interface Bidirectional Data. Connects to the master data line. Requires a pull-up resistor if not provided
elsewhere in the system.
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