AT1175 AIMTRON | Alldatasheet
Document overview
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Technical content
Features
˙Resolution: 8-Bit ± 0.5 LSB(DNL) ˙Maximum Conversion Rate: 20 MSPS ˙Built-in Sample and Hold Function ˙Built-in Reference V oltage Self Bias Circuit ˙Single +5.0 V Power Supply ˙Three-State TTL Compatible Output ˙Direct Replacement for the Sony CXD1175
Applications
˙Video Digitizing ˙Personal Computer Video ˙Multimedia ˙Digital Television General Description The AT1175 is a CMOS two-step A/D converter capable of digitizing full-scale analog input signals into 8-bit digital words at sample rate o f 20 MSPS. For most application, no external sample-and- hold or video driving amplifiers are needed thanks to the device’s narrow aperture time, wide bandwidth, and low input capacitance. The AT1175 operates from a single +5.0V power supply and has an internal voltage reference, which eliminates the need for external reference circuitry. All digital inputs are CMOS compatible and the tri-state outputs are TTL- compatible. The AT1175 is ideal for most video and image processing applications that require low power dissipation and low cost. Block Diagram Aimtron reserves the right without notice to change this circuitry and specifications.
Preliminary Product Information 8-Bit 20MSPS CMOS VIDEO A/D CONVERTER Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: service@aimtron.com.tw Pin Configuration
Ordering Information
Part number. Package Marking AT1175S SOP24( 300 mil) AT1175S AT1175S_GRE SOP24(300 mil),Green AT1175S, date code with one bottom line Pin Description PIN NAME FUNCTION PIN NAME FUNCTION OE Output Enable Control D0~D7 Enabled When OE = Low D0~D7 at Tri-state When OE = High AVDD Analog +5V Supply 2,24 DGND Digital GND 23 VRB Reference Voltage (Bottom) 3~10 D0~D7 Digital Output Data D0 (LSB), D7(MSB) 17 VRT Reference Voltage (Top) 11,13 DV DD Digital +5V Supply 19 V IN Analog Input
12 CLK Clock Input 20
16 VRTS Shorted with VRT to Generate
+2.6V Reference
22 VRBS Shorted with VRB to
Generate +0.6V Reference
Preliminary Product Information 8-Bit 20MSPS CMOS VIDEO A/D CONVERTER Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: service@aimtron.com.tw Absolute Maximum Ratings (Beyond which damage may occur) 250C Supply Voltages Input Voltages Reference Input V oltage ………………….…AGND to V DD Temperature Operating Temperature …………..…………-20 to +70 0C Lead Temperature, (Soldering 10 seconds) ………..300 0C Storage Temperature …………………...….-55 to +125 0C Electrical Specifications Ta=+250C, A VDD=DVDD= VDD =+5.0V , AGND=DGND=0.0V , VRB=1V and VRT=3V , fs=20 MSPS ,unless otherwise specified. PARAMETERS TEST CONDICTION MIN TYP MAX UNITS Resolution 8 Bits DC Accuracy (+250C) Integral Nonlinearity Differential Nonlinearity Zero Scale Error Full Scale Error No Missing Codes fs=20 MSPS, V IN =1.0V to 3.0V EZS EFS ±0.8 ±0.5 - 1 0 - 3 5 - 6 0 0 4 5 6 0 G u a r a n t e e d LSB LSB mV mV Analog Input Input V oltage Range Input Bias Current Input Resistance Input Capacitance V IN V RB V RT ±5.0 100 200 1 5 V μA kΩ pF Reference Input Reference Ladder Resistance Reference Current Reference Input V oltage Reference Differential Internal Bias1 Internal Bias2 (V RT) V RT to VRB V RT - VRB =2.0V V RB V RT V RT - VRB V RB V RT –VRB Short V RT and VRTS Short V RB and VRBS Short VRT and VRTS Short V RB and AGND 200 270 340 5.2 7.5 10.5 0.0 0.6 3.0 2.0 2.6 V DD 1 . 0 - 5 . 0 0.55 0.60 0.65 1.9 2.0 2.1 2.25 2.39 2.53 Ω mA V V V V V V Dynamic Performance Signal-To-Noise Ratio fin=1.667MHz fin=3.85MHz Spurious Free Dynamic Range fin=1.667MHz fin=3.85MHz Differential Phase Differential Gain fs=14.29 MSPS fs=14.29 MSPS NTSC 40 IRE Mod Ramp fs=14.3 MSPS 44 46 43 48 4 1 4 2 0.7 1.0 dB dB dB dB Degrees Digital Inputs V oltage, Logic High 4.0 VDD V
Preliminary Product Information 8-Bit 20MSPS CMOS VIDEO A/D CONVERTER Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: service@aimtron.com.tw V oltage, Logic Low Input Current, Logic High Input Current, Logic Low V DD=max, VIH=VDD V DD=max, VIL=DGND 0 1 . 0 5 . 0 5 . 0 V μA μA Digital Outputs Output Current, Logic High Output Current, Logic Low Output Current, High ‘Z’ V oltage , Logic High V oltage , Logic Low V DD=min V OH=4.25V V DD=min V OL=0.4V V DD=max /OE=V DD I OH =-4mA I OL =4mA - 1.1 2.0 3.5 0 . 8 mA mA μA V V Power Supply Requirements AV DD (Analog Supply V oltage) DV DD (Digital Supply V oltage) Supply V oltage Difference Supply Current Power Dissipation (A VDD-DVDD) fs=20 MSPS(Does not include ref. current) NTSC ramp wave input + 4 . 7 5 + 5 . 0 + 5 . 2 5 + 4 . 7 5 + 5 . 0 + 5 . 2 5 - 0 . 1 0 . 0 0 . 1 3 0 1 5 0 V V V mA mW Timing Specifications Ta=+250C, A VDD=DVDD= VDD =+5.0V , AGND=DGND=0.0V , VRB=1V and VRT=3V , fs=20 MSPS ,unless otherwise specified. PARAMETERS TEST CONDICTION MIN TYP MAX UNITS fS Maximum conversion rate f in=1kHz ramp 20 MSPS tW(H) Pulse Width High 15 ns tW(L) Pulse Width Low 15 ns td(D) Digital output delay time CL≦10pF 1 8 3 0 n s tAJ Aperture jitter time 30 ps td(S) S a m p l i n g d e l a y t i m e 4 n s ten Output Enable time C L=10pF 5 ns tdis Output Disable time C L=10pF 7 ns N+5N+4 N+3 N+2 N+1N tw(H) tw(L) td(s) N-3 N-2 N-1 N N+2 Analog input Clock Data Output td(D) OE tdis ten
Preliminary Product Information 8-Bit 20MSPS CMOS VIDEO A/D CONVERTER Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: service@aimtron.com.tw Digital Output Code Input Signal Voltage Step Digital output code M S B L S B VRT VRB 127 128 254 255 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 Typical Application Schematic
Preliminary Product Information 8-Bit 20MSPS CMOS VIDEO A/D CONVERTER Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: service@aimtron.com.tw Package Outline (24-pin 300 mil Plastic SOP) DIMENSIONS IN MILLIMETERS DIMENSIONS IN INCHESSYMBOLS MIN NOM MAX MIN NOM MAX A1 0.10 - 0.30 0.004 - 0.012 y0-80-8