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CS5372 Datasheet(PDF) 7 Page - Cirrus Logic |
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CS5372 Datasheet(HTML) 7 Page - Cirrus Logic |
7 / 22 page CS5371/CS5372 DS255PP2 7 2. GENERAL DESCRIPTION. The CS5371 and CS5372 are one and two channel fourth-order ∆−Σ modulators, optimized for ex- tremely high resolution measurement of signals be- tween DC and 1644 Hz. They are designed to be used with the CS5376 low power multi-channel decimation filter. Figure 3 on page 8 shows a four- channel system connection diagram for two CS5372 and one CS5376. High Performance The CS5371/CS5372 modulators have exceptional performance characteristics. Modulator dynamic range (SNR) is 124 dB over a 411 Hz bandwidth, with total harmonic distortion (THD) of -118 dB. Low Power Consumption The CS5371/CS5372 modulators have very low power consumption. Power consumption is only 25 mW per channel in normal mode (LPWR=0, MCLK=2.048 MHz), and 15 mW per channel in low power mode (LPWR=1, MCLK=1.024 MHz). An independently selectable power-down mode (PWDN=1) can be used to disable a modulator and reduces its power consumption to 1 mW. If MCLK is then halted (MCLK=0), the modulator enters a micropower state using only 10 µW per channel. Small Package Size The CS5371/CS5372 modulators are available in a very small 24-pin SSOP package approximately 8 mm x 8 mm in size. The CS5372 has two modu- lator channels per package to increase board layout density even further. Multi-Channel System Support Combining the CS5371 and CS5372 modulators with the CS5376 digital filter permits multiple channel system configurations to be supported. 1 Channel - CS5371, CS5376 2 Channel - CS5372, CS5376 3 Channel - CS5371, CS5372, CS5376 4 Channel - CS5372, CS5372, CS5376 Differential Analog Signal Inputs The CS5371/CS5372 modulators have differential analog inputs capable of measuring signals up to 5.0 V peak-to-peak (2.5 V fully differential) when using a 2.5 V voltage reference. The inputs will tolerate a 5% over-range voltage and continue op- erating at full specification. Digital Filter Interface The CS5371/CS5372 modulators are designed to operate with the CS5376 digital filter. The CS5376 generates the modulator clock and synchronization signal inputs (MCLK and MSYNC), while receiv- ing the modulator data and over-range flag outputs (MDATA and MFLAG). The modulators produce an oversampled ∆−Σ serial bit stream at 512 kbits per second when operated from a 2.048 MHz mod- ulator clock. Multiple Power Supply Configurations The CS5371/CS5372 modulators support multiple power supply configurations. They can run from single or dual supplies in the following configura- tions: s VA+ = +5V; VA- = 0V; VD = +3V to +5V s VA+ = +2.5V; VA- = -2.5V; VD = +3V to +5V s VA+ = +3V; VA- = -3V; VD = +3V |
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Similar Description - CS5372 |
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