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MAX1151AIZS Datasheet(PDF) 4 Page - Maxim Integrated Products |
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MAX1151AIZS Datasheet(HTML) 4 Page - Maxim Integrated Products |
4 / 8 page 8-Bit, 750Msps Flash ADC 4 _______________________________________________________________________________________ ______________________________________________________________Pin Description NAME FUNCTION 1, 2, 3 D2B, D3B, D4B Data Output Bank, Bits 2, 3, and 4 4, 5, 19, 20, 22, 23, 27, 28, 38, 39, 40, 46, 47, 49, 60, 67, 79 VEE Negative Supply, nominally -5.2V PIN 6 D5B Data Output Bank B, Bit 5 7, 9, 11, 54, 56, 58, 69, 71, 73, 75, 77 DGND Digital Ground 13, 14, 31, 34, 41, 63, 64 N.C. No Connection. Not internally connected. 12 D8B Data Output Bank B, Bit 8 (OVR) 10 D7B Data Output Bank B, Bit 7 (MSB) 8 D6B Data Output Bank B, Bit 6 35 VRM Reference-Voltage Middle, nominally -1V 32, 33 VIN Analog Input Voltage. Can be either voltage or sense. 24 VRBS Reference-Voltage Sense Bottom 21 VRBF Reference-Voltage Force Bottom 15-18, 25, 26, 29, 30, 36, 37, 44, 45, 51, 52 AGND Analog Ground 50 CLK Clock Input 48 NCLK Inverse Clock Input 43 VRTS Reference-Voltage Sense Top 42 VRTF Reference-Voltage Force Top 59, 61, 62, 65, 66, 68 D1A–D6A Data Output Bank A, Bits 1–6 57 D0A Data Output Bank A, Bit 0 (LSB) 55 NDRA Not Data Ready Bank A 53 DRA Data Ready Bank A 72 D8A Data Output Bank A, Bit 8 (OVR) 70 D7A Data Output Bank A, Bit 7 (MSB) 80 D1B Data Output Bank B, Bit 1 78 D0B Data Output Bank B, Bit 0 (LSB) 76 DRB Data Ready Bank B 74 NDRB Not Data Ready Bank B _______________Detailed Description The MAX1151 is one of the fastest monolithic, 8-bit, paral- lel, flash analog-to-digital converters (ADCs) available today. The nominal conversion rate is 750Msps, and the analog bandwidth is in excess of 900MHz. A major advance over previous flash converters is the inclusion of 255 input preamplifiers between the reference ladder and input comparators (see Functional Diagram). This not only reduces clock transient kickback to the input and reference ladder but also reduces the effect of the input signal’s dynamic state on the input comparators’ latching characteristics. The preamplifiers act as buffers to stabi- lize the input capacitance so that it remains constant over different input voltage and frequency ranges, making the part easier to drive than previous flash converters. The preamplifiers also add a gain of +2 to the input signal, so that each comparator has a wider overdrive or threshold range to trip into or out of the active state. This gain reduces metastable states that can cause errors at the output. |
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