PDF MAX1125 Data sheet ( Hoja de datos )

Número de pieza	MAX1125
Descripción	8-Bit / 300Msps Flash ADC
Fabricantes	Maxim Integrated
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No Preview Available ! 19-1100; Rev 0; 6/96 EVAALVUAAILTAIOBNLEKIT 8-Bit, 300Msps Flash ADC _______________General Description The MAX1125 is a monolithic, flash analog-to-digital con- verter (ADC) capable of digitizing a 2V analog input signal into 8-bit digital words at a typical 300Msps update rate. For most applications, no external sample-and-hold is required for accurate conversion due to the device's narrow aperture time, wide bandwidth, and low input capacitance. A single standard -5.2V power supply is required to operate the MAX1125, with nominal 2.2W power dissipation. A special decoding scheme reduces metastable errors to 1LSB. The part is packaged in a 42-pin ceramic sidebraze that is pin compatible with the CX20116 and CX41396D. The surface-mount 44-pin CERQUAD pack- age allows access to additional reference ladder taps, an overrange bit, and a data-ready output. The pin- compatible 150Msps MAX1114 is also available. ________________________Applications Digital Oscilloscopes Transient Capture Radar, EW, ECM Direct RF Down-Conversion Medical Electronics Ultrasound, CAT Instrumentation _________________Pin Configurations TOP VIEW DGND 1 AGND 2 VEE 3 MINV 4 CLK 5 CLK 6 VEE 7 AGND 8 AGND 9 VRBS 10 VRBF 11 MAX1125 33 AGND 32 VEE 31 LINV 30 N.C. 29 DRINV 28 N.C. 27 VEE 26 AGND 25 AGND 24 VRTS 23 VRTF CERQUAD ____________________________Features o Metastable Errors Reduced to 1LSB o 10pF Input Capacitance o 210MHz Input Bandwidth o 300Msps Conversion Rate o 2.2W Typical Power Dissipation o Single -5.2V Supply ______________Ordering Information PART TEMP. RANGE PIN-PACKAGE INL (LSBs) MAX1125AIDO -20°C to +85°C 42 Ceramic SB ±0.75 MAX1125BIDO -20°C to +85°C 42 Ceramic SB ±1 MAX1125AIBH -20°C to +85°C 44 CERQUAD ±0.75 MAX1125BIBH -20°C to +85°C 44 CERQUAD ±1 Functional Diagram appears at end of data sheet. ____Pin Configurations (continued) TOP VIEW VEE 1 N.C. 2 LINV 3 VEE 4 AGND 5 DGND 6 DO (LSB) 7 D1 8 D2 9 D3 10 D4 11 D5 12 D6 13 D7 (MSB) 14 DGND 15 AGND 16 VEE 17 MINV 18 N.C. 19 CLK 20 CLK 21 MAX1125 Ceramic SB 42 N.C. 41 VRTF 40 N.C. 39 VEE 38 VEE 37 N.C. 36 N.C. 35 AGND 34 VIN 33 AGND 32 VR2 31 AGND 30 VIN 29 AGND 28 N.C. 27 N.C. 26 VEE 25 VEE 24 N.C. 23 VRBF 22 N.C. ________________________________________________________________ Maxim Integrated Products 1 For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800 1 page 8-Bit, 300Msps Flash ADC ______________________________________________________________Pin Description PIN Ceramic SB 1, 4, 17, 25, 26, 38, 39 CERQUAD 3, 7, 12, 22, 27, 32 2, 19, 22, 24, 27, 28, 36, 37, 40, 42 28, 30 3 31 5, 16, 29, 31, 33, 35 2, 8, 9, 14, 16, 18, 20, 25, 26, 33 6, 15 7 8–13 14 18 — 20 21 — 23 1, 34 36 37–42 43 4 44 5 6 10 11 30, 34 15, 19 — 13 32 17 — 21 41 23 — 24 — 29 — 35 NAME FUNCTION VEE N.C. LINV AGND DGND D0 D1–D6 D7 MINV D8 CLK CLK VRBS VRBF VIN VR1 VR2 VR3 VRTF VRTS DRINV DREADY Negative Analog Supply (nominally -5.2V) No Connect. Not internally connected. D0–D6 Output Inversion Control Analog Ground Digital Ground Digital Data Output (LSB) Digital Data Output Digital Data Output (MSB) D7 Output Inversion Control Overrange Output Inverse ECL Clock Input Pin ECL Clock Input Pin Reference Voltage Bottom, Sense Reference Voltage Bottom, Force Analog Input. Can be connected to the input signal or used as a sense. Reference Voltage Tap 1 (typically -1.5V) Reference Voltage Tap 2 (typically -1V) Reference Voltage Tap 3 (typically -0.5V) Reference Voltage Top, Force Reference Voltage Top, Sense Data-Ready Inverse Data-Ready Output _______________Detailed Description The MAX1125 is a 300Msps, monolithic, 8-bit parallel flash analog-to-digital converter (ADC) with an analog bandwidth of over 200MHz. A major advance over pre- vious flash converters is the inclusion of 256 input pre- amplifiers between the reference ladder and input comparators. (See Functional Diagram.) This feature not only reduces clock-transient kickback to the input and reference ladder due to a low AC beta, but also reduces the effect of the dynamic state of the input sig- nal on the latching characteristics of the input compara- tors. The preamplifiers act as buffers and stabilize the input capacitance so it remains constant for varying input voltages and frequencies, making the part easier to drive than previous flash converters. The MAX1125 incorporates a special decoding scheme that reduces metastable errors (sparkle codes or flyers) to a maxi- mum of 1LSB. _______________________________________________________________________________________ 5 5 Page 8-Bit, 300Msps Flash ADC AGND Figure 5. Clock Input VEE VREF CLK CLK 13k -1.3V 13k VEE 1N4736 R4 -2V R4 R1 R1 R1 R1 R1 R1 R1 R1 R3 R2 VIN R2 CLK CLK R2 R1 = 50Ω 1/4 Watt CC 5% R2 = 1kΩ 1/4 Watt CC 5% R3 = 6.5Ω 1/4 Watt CC 5% R4 = 6.5Ω 1/2 Watt CC 5% VREF = -2.00V VEE = -6.6V VRBF VEE D0 D1 MAX1125 VIN D2 D3 D4 D5 D6 CLK D7 CLK LINV MINV Figure 6. Burn-In Circuit (Ceramic SB package only) R2 -2V ______________________________________________________________________________________ 11 11 Page

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