參數(shù)資料
型號(hào)： AD7709ARUZ
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 32/32頁(yè)
文件大?。?/td> 0K
描述： IC ADC 16BIT SIGMA-DELTA 24TSSOP
標(biāo)準(zhǔn)包裝： 62
位數(shù)： 16
采樣率（每秒）： 105
數(shù)據(jù)接口： DSP，MICROWIRE?，QSPI?，串行，SPI?
轉(zhuǎn)換器數(shù)目： 1
功率耗散（最大）： 3.75mW
電壓電源： 單電源
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 24-TSSOP（0.173"，4.40mm 寬）
供應(yīng)商設(shè)備封裝： 24-TSSOP
包裝： 管件
輸入數(shù)目和類型： 2 個(gè)差分，單極；2 個(gè)差分，雙極；4 個(gè)偽差分，單極；4 個(gè)偽差分，雙極
REV. A
AD7709
–9–
PIN FUNCTION DESCRIPTIONS
Pin No. Mnemonic Function
1
IOUT1
Output for Internal Excitation Current Source. Either current source IEXC1, IEXC2, IEXC3, or a combina-
tion of the current sources, can be switched to this output.
2
IOUT2
Output for Internal Excitation Current Source. Either current source IEXC1, IEXC2, IEXC3, or a combina-
tion of the current sources, can be switched to this output.
3
REFIN1(+) Positive Reference Input. REFIN1(+) can lie anywhere between VDD and GND + 1 V. The nominal refer-
ence voltage (REFIN1(+) – REFIN1(–)) is 2.5 V, but the part is functional with a reference range from 1 V to VDD.
4
REFIN1(–) Negative Reference Input. This reference input can lie anywhere between GND and VDD – 1 V.
5
AIN1
Analog Input. Programmable gain input that can be used as a pseudo-differential input when used with
AINCOM or as the positive input of a fully differential input pair when used with AIN2.
6
AIN2
Analog Input. Programmable gain input that can be used as a pseudo-differential input when used with
AINCOM or as the negative input of a fully differential input pair when used with AIN1.
7
AIN3/P3
Analog Input/Digital Port Bit. Programmable gain input that can be used as a pseudo-differential input when
used with AINCOM or as the positive input of a fully differential input pair when used with AIN4. This pin
can also be programmed as a general-purpose digital input bit.
8
AIN4/P4
Analog Input/Digital Port Bit. Programmable gain input that can be used as a pseudo-differential input when
used with AINCOM or as the negative input of a fully-differential input pair when used with AIN3. This pin
can also be programmed as a general-purpose digital input bit.
9
AINCOM
All analog inputs are referenced to this input when configured in pseudo-differential input mode.
10
REFIN2(+) Positive Reference Input. REFIN2(+) can lie anywhere between VDD and GND + 1 V. The nominal reference
voltage (REFIN2(+) – REFIN2(–)) is 2.5 V, but the part is functional with a reference range from 1 V to VDD.
11
REFIN2(–) Negative Reference Input. This reference input can lie anywhere between GND and VDD – 1 V.
12
P2/SW2
Dual-Purpose Pin. It can act as a general-purpose output (P2) bit or as a low-side power switch (SW2) to
PWRGND.
13
PWRGND
Ground Point for the Low-Side Power Switches SW2 and SW1. PWRGND must be tied to GND.
14
P1/SW1
Dual-Purpose Pin. It can act as a general-purpose output (P1) bit or as a low-side power switch (SW1) to
PWRGND.
15
RESET
Digital Input Used to Reset the ADC to Its Power-On-Reset Status. This pin has a weak pull-up internally to VDD.
16
SCLK
Serial Clock Input for Data Transfers to and from the ADC. The SCLK has a Schmitt-triggered input making
the interface suitable for opto-isolated applications. The serial clock can be continuous with all data transmitted
in a continuous train of pulses. Alternatively, it can be a noncontinuous clock with the information being
transmitted to or from the AD7709 in smaller batches of data. A weak pull-up to VDD is provided on the
SCLK input.
17
CS
Chip Select Input. This is an active low logic input used to select the AD7709.
CS can be used to select the
AD7709 in systems with more than one device on the serial bus or as a frame synchronization signal in com-
municating with the device.
CS can be hardwired low allowing the AD7709 to operate in 3-wire mode with
SCLK, DIN, and DOUT used to interface with the device. A weak pull-up to VDD is provided on the CS input.
18
RDY
RDY is a Logic Low Status Output from the AD7709. RDY is low if the ADC has valid data in its data
register. This output returns high on completion of a read operation from the data register. If data is not
read,
RDY will return high prior to the next update indicating to the user that a read operation should
not be initiated.
19
DOUT
Serial Data Output Accessing the Output Shift Register of the AD7709. The output shift register can contain
data from any of the on-chip data or control registers.
20
DIN
Serial Data Input Accessing the Input Shift Register on the AD7709. Data in this shift register is transferred to
the control registers within the ADC, the selection bits of the communications register selecting which
control register. A weak pull-up to VDD is provided on the DIN input.
21
GND
Ground Reference Point for the AD7709
22
VDD
Supply Voltage, 3 V or 5 V Nominal
23
XTAL2
Output from the 32.768 kHz Crystal Oscillator Inverter
24
XTAL1
Input to the 32.768 kHz Crystal Oscillator Inverter
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