參數(shù)資料
        型號(hào)： AD7608BSTZ-RL
        廠商： Analog Devices Inc
        文件頁數(shù)： 11/32頁
        文件大小： 0K
        描述： IC DAS W/ADC 18BIT 8CH 64LQFP
        標(biāo)準(zhǔn)包裝： 1,500
        類型： 數(shù)據(jù)采集系統(tǒng)（DAS），ADC
        分辨率（位）： 18 b
        采樣率（每秒）： 200k
        數(shù)據(jù)接口： DSP，MICROWIRE?，并聯(lián)，QSPI?，串行，SPI?
        電壓電源： 模擬和數(shù)字
        電源電壓： 2.3 V ~ 5.25 V，4.75 V ~ 5.25 V
        工作溫度： -40°C ~ 85°C
        安裝類型： 表面貼裝
        封裝/外殼： 64-LQFP
        供應(yīng)商設(shè)備封裝： 64-LQFP（10x10）
        包裝： 帶卷 (TR)
        Data Sheet
        AD7608
        Rev. A | Page 19 of 32
        THEORY OF OPERATION
        CONVERTER DETAILS
        The AD7608 is a data acquisition system that employs a high
        speed, low power, charge redistribution, successive approxi-
        mation analog-to-digital converter (ADC) and allows the
        simultaneous sampling of eight analog input channels. The
        analog inputs on the AD7608 can accept true bipolar input
        signals. The RANGE pin is used to select either ±10 V or
        ±5 V as the input range. The AD7608 operates from a single
        5 V supply.
        The AD7608 contains input clamp protection, input signal
        scaling amplifiers, a second-order antialiasing filter, track-and-
        hold amplifiers, an on-chip reference, reference buffers, a high
        speed ADC, a digital filter, and high speed parallel and serial
        interfaces. Sampling on the AD7608 is controlled using the
        CONVST x signals.
        ANALOG INPUT
        Analog Input Ranges
        The AD7608 can handle true bipolar, single-ended input voltages.
        The logic level on the RANGE pin determines the analog input
        range of all analog input channels. If this pin is tied to a logic
        high, the analog input range is ±10 V for all channels. If this pin
        is tied to a logic low, the analog input range is ±5 V for all
        channels. A logic change on the RANGE pin has an immediate
        effect on the analog input range; how-ever, there is typically
        a settling time of approximately 80 s, in addition to the normal
        acquisition time requirement. The recommended practice is to
        hardwire the RANGE pin according to the desired input range
        for the system signals.
        During normal operation, the applied analog input voltage
        should remain within the analog input range selected via the
        range pin. A RESET pulse must be applied after power-up to
        ensure the analog input channels are configured for the range
        selected.
        When in a power-down mode, it is recommended to tie the
        analog inputs to GND. As per the input clamp protection section,
        the overvoltage clamp protection is recommended for use in
        transient overvoltage conditions and should not remain active
        for extended periods. Stressing the analog inputs outside of the
        conditions mentioned here may degrade the Bipolar Zero Code
        error and THD performance of the AD7608.
        Analog Input Impedance
        The analog input impedance of the AD7608 is 1 M. This is
        a fixed input impedance that does not vary with the AD7608
        sampling frequency. This high analog input impedance elimi-
        nates the need for a driver amplifier in front of the AD7608,
        allowing for direct connection to the source or sensor. With
        the need for a driver amplifier eliminated, bipolar supplies
        (which are often a source of noise in a system) can be
        removed from the signal chain.
        Analog Input Clamp Protection
        Figure 31 shows the analog input structure of the AD7608. Each
        AD7608 analog input contains clamp protection circuitry. Despite
        single 5 V supply operation, this analog input clamp protection
        allows for an input overvoltage up to ±16.5 V.
        1M
        CLAMP
        Vx
        1M
        CLAMP
        VxGND
        SECOND-
        ORDER
        LPF
        RFB
        08938-
        029
        Figure 31. Analog Input Circuitry
        Figure 32 shows the voltage vs. current characteristic of the
        clamp circuit. For input voltages of up to ±16.5 V, no current
        flows in the clamp circuit. For input voltages that are above
        ±16.5 V, the AD7608 clamp circuitry turns on.
        30
        –40
        –30
        –20
        –10
        0
        10
        20
        –25
        –20
        –15
        –10
        –5
        0
        5
        10
        15
        20
        25
        INP
        UT
        CL
        AM
        P
        CURRE
        NT
        SOURCE VOLTAGE (V)
        08938-
        030
        AVCC, VDRIVE = 5V
        TA = 25 °C
        Figure 32. Input Protection Clamp Profile
        A series resistor should be placed on the analog input channels
        to limit the current to ±10 mA for input voltages above ±16.5 V.
        In an application where there is a series resistance on an analog
        input channel, Vx, a corresponding resistance is required on the
        analog input GND channel, VxGND (see Figure 33). If there is
        no corresponding resistor on the VxGND channel, an offset
        error occurs on that channel.
        1M
        CLAMP
        Vx
        1M
        CLAMP
        VxGND
        RFB
        C
        R
        ANALOG
        INPUT
        SIGNAL
        AD7608
        08938-
        031
        Figure 33. Input Resistance Matching on the Analog Input
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