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MAX11045ECB+ Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX11045ECB+ Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 20 page 4-/6-/8-Channel, 16-Bit, Simultaneous-Sampling ADCs 10 ______________________________________________________________________________________ Detailed Description The MAX11044/MAX11045/MAX11046 are fast, low- power ADCs that combine 4, 6, or 8 independent ADC channels in a single IC. Each channel includes simulta- neously sampling independent T/H circuitry that pre- serves relative phase information between inputs making the MAX11044/MAX11045/MAX11046 ideal for motor control and power monitoring. The MAX11044/ MAX11045/MAX11046 are available with ±5V input ranges that feature ±20mA overrange, fault-tolerant inputs. The MAX11044/MAX11045/MAX11046 operate with a single 4.75V to 5.25V supply. A separate 2.7V to 5.25V supply for digital circuitry makes the devices compatible with low-voltage processors. The MAX11044/MAX11045/MAX11046 perform conver- sions for all channels in parallel by activating indepen- dent ADCs. Results are available through a high-speed, 20MHz, parallel data bus after a conversion time of 3μs following the end of a sample. The data bus is bidirec- tional and allows for easy programming of the configu- ration register. The MAX11044/MAX11045/MAX11046 feature a reference buffer, which is driven by an internal bandgap reference circuit (VREFIO = 4.096V). Drive REFIO with an external reference or bypass with 0.1μF capacitor to ground when using the internal reference. Analog Inputs Track and Hold (T/H) To preserve phase information across all channels, each input includes a dedicated T/H circuitry. The input tracking circuitry provides a 4MHz small-signal band- width, enabling the device to digitize high-speed tran- sient events and measure periodic signals with band- widths exceeding the ADC’s sampling rate by using undersampling techniques. Use anti-alias filtering to avoid high-frequency signals being aliased into the fre- quency band of interest. Input Range and Protection The full-scale analog input voltage is a product of the ref- erence voltage. For the MAX11044/MAX11045/ MAX11046, the full-scale input is bipolar in the range of: When in external reference mode, drive VREFIO with a 3.0V to 4.25V source, resulting in an input range of ±3.662V to ±5.188V, respectively. All analog inputs are fault-protected to up to ±20mA. The MAX11044/MAX11045/MAX11046 include an input clamping circuit that activates when the input voltage at the analog input is above (VAVDD + 300mV) or below –(VAVDD + 300mV). The clamp circuit remains high impedance while the input signal is within the range of ±VAVDD and draws little or almost no current. However, when the input signal exceeds ±VAVDD, the clamps begin to turn on and shunt current to/from the AVDD supply. Consequently, to obtain the highest accuracy, ensure that the input voltage does not exceed ±VAVDD. Note that the input clamp circuit also has a small amount of hysteresis and once triggered remains engaged, shunting current to/from AVDD until the input returns to within the convertible range by several hun- dredths of a volt. This effect can cause some errors at ±( . ) Vx REFIO 5 4 096 Pin Description (continued) PIN TQFP TQFN NAME FUNCTION 42 37 CH4 Channel 4 Analog Input 44 39 CH5 Channel 5 Analog Input 47 42 CH6 Channel 6 Analog Input 50 45 CH7 Channel 7 Analog Input 61 52 WR Active-Low Write Input. Drive WR low to write to the ADC. Configuration registers are loaded on the rising edge of WR. 62 53 CS Active-Low Chip-Select Input. Drive CS low when reading from or writing to the ADC. 63 54 RD Active-Low Read Input. Drive RD low to read from the ADC. Each rising edge of RD advances the channel output on the data bus. 64 55 DB15 16-Bit Parallel Data Bus Digital Out Bit 15 —— EP Exposed Pad. Internally connected to AGND. Connect to a large ground plane to maximize thermal performance. Not intended as an electrical connection point. |
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