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MX7705 Datasheet(PDF) 17 Page - Maxim Integrated Products |
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MX7705 Datasheet(HTML) 17 Page - Maxim Integrated Products |
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17 / 33 page  MX7705 16-Bit, Low-Power, 2-Channel, Sigma-Delta ADC Maxim Integrated | 17 www.maximintegrated.com Detailed Description The MX7705 low-power, 2-channel, serial-output ADC uses a sigma-delta modulator with a digital filter to achieve 16-bit resolution with no missing codes. The device includes a PGA, an on-chip input buffer, and a bidirectional communications port. The MX7705 oper- ates with a single 2.7V to 5.25V supply. Fully differential inputs, an internal input buffer, and an on-chip PGA (gain = 1 to 128) allow low-level signals to be directly measured, minimizing the requirements for external signal conditioning. Self-calibration corrects for gain and offset errors. A programmable digital filter allows for the selection of the output data rate and first- notch frequency from 20Hz to 500Hz. The bidirectional serial SPI-/QSPI-/MICROWIRE-compati- ble interface consists of four digital control lines (SCLK, CS, DOUT, and DIN) and provides an easy interface to microcontrollers (µCs). Connect CS to GND to configure the MX7705 for 3-wire operation. Analog Inputs The MX7705 accepts four analog inputs (AIN1+, AIN1-, AIN2+, and AIN2-) in buffered or unbuffered mode. Use Table 8 to select the positive and negative input pair for a fully differential channel. The input buffer iso- lates the inputs from the capacitive load presented by the PGA/modulator, allowing for high source-imped- ance analog transducers. The value of the BUF bit in the setup register (see the Setup Register section) deter- mines whether the input buffer is enabled or disabled. Internal protection diodes, which clamp the analog input to VDD and/or GND, allow the input to swing from (GND - 0.3V) to (VDD + 0.3V), without damaging the device. If the analog input exceeds 300mV beyond the supplies, limit the input current to 10mA. Input Buffers When the analog input buffer is disabled, the analog input drives a typical 7pF (gain = 1) capacitor, CTOTAL, in series with the 7k Ω typical on-resistance of the track and hold (T/H) switch (Figure 1). CTOTAL is comprised of the sampling capacitor, CSAMP, and the stray capac- itance, CSTRAY. During the conversion, CSAMP charges to (AIN+ - AIN-). The gain determines the value of CSAMP (Table 5). MX7705 SWITCHING NETWORK CLOCK GENERATOR DIVIDER DIGITAL FILTER 2ND-ORDER SIGMA-DELTA MODULATOR PGA BUFFER BUFFER SERIAL INTERFACE, REGISTERS, AND CONTROL VDD GND SCLK DIN DOUT CLKIN CLKOUT AIN1+ AIN1- AIN2+ AIN2- REF+ REF- S1 S2 S1 AND S2 ARE OPEN IN BUFFERED MODE AND CLOSED IN UNBUFFERED MODE CS DRDY RESET Functional Diagram |
Similar Part No. - MX7705_V01 |
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Similar Description - MX7705_V01 |
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