AD9057PCB

AD9057 AD | Alldatasheet

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REV. B Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. a 8-Bit

40 MSPS/60 MSPS/80 MSPS A/D Converter

Tel: 617/329-4700 World Wide Web Site: http://www.analog.com Fax: 617/326-8703 © Analog Devices, Inc., 1997 FUNCTIONAL BLOCK DIAGRAM ADCT/H

8 D7–D0

+2.5V 1kΩ GND PRODUCT DESCRIPTION The AD9057 is an 8-bit monolithic analog-to-digital converter optimized for low cost, low power, small size, and ease of use. With a 40 MSPS, 60 MSPS or 80 MSPS encode rates capabil- ity and full-power analog bandwidth of 120 MHz, the compo- nent is ideal for applications requiring excellent dynamic performance. To minimize system cost and power dissipation, the AD9057 includes an internal +2.5 V reference and a track-and-hold circuit. The user must provide only a +5 V power supply and an encode clock. No external reference or driver components are required for many applications. The AD9057’s encode input is TTL/CMOS compatible and the 8-bit digital outputs can be operated from +5 V or +3 V supplies. A power-down function may be exercised to bring total con- sumption to < 10 mW. In power-down mode the digital outputs are driven to a high impedance state. Fabricated on an advanced BiCMOS process, the AD9057 is available in a space saving 20-lead surface mount plastic pack- age (20 SSOP) and is specified over the i ndustrial (–40°C to +85°C) temperature range. Customers desiring multichannel digitization may consider the AD9059, a dual 8-bit, 60 MSPS monolithic based on the AD9057 ADC core. The AD9059 is available in a 28-lead sur- face mount plastic package (28 SSOP) and is specified over the industrial temperature range.

FEATURES

8-Bit, Low Power ADC: 200 mW Typical

120 MHz Analog Bandwidth

On-Chip +2.5 V Reference and T/H

1 V p-p Analog Input Range

Single +5 V Supply Operation +5 V or +3 V Logic Interface Power-Down Mode: < 10 mW Three Performance Grades (40 MSPS, 60 MSPS, 80 MSPS)

APPLICATIONS

Digital Communications (QAM Demodulators) RGB & YC/Composite Video Processing Digital Data Storage Read Channels Medical Imaging Digital Instrumentation PIN CONFIGURATION TOP VIEW (Not to Scale) PWRDN D0 (LSB) VREF OUT VREF IN GND AD9057 VDD GNDVD BIAS OUT AIN VD GND ENCODE D7 (MSB)

REV. B–2– AD9057–SPECIFICATIONS Test AD9057BRS-40 AD9057BRS-60 AD9057BRS-80 Parameter Temp Level Min Typ Max Min Typ Max Min Typ Max Units RESOLUTION 8 8 8 Bits DC ACCURACY Full VI 2.0 2.0 2.0 LSB Full VI 2.0 2.0 2.0 LSB No Missing Codes Full VI GUARANTEED GUARANTEED GUARANTEED Full VI –8 +8 –8 +8 –8 +8 % FS Gain Tempco1 Full V ± 70 ± 70 ± 70 ppm/ °C ANALOG INPUT Input Voltage Range (Centered at +2.5 V) +25 °C V 1.0 1.0 1.0 V p-p Input Offset Voltage +25 °C I –15 ± 0 +15 –15 ± 0 +15 –15 ± 0 +15 mV Full VI –25 +25 –25 +25 –25 +25 mV Input Resistance +25 °C V 150 150 150 k Ω Input Capacitance +25 °C V 222 p F Input Bias Current +25 °C I 61 6 61 6 61 6 µA Full VI 25 25 25 µA Analog Bandwidth +25 °C V 120 120 120 MHz BANDGAP REFERENCE Temperature Coefficient Full V ± 10 ± 10 ± 10 ppm/ °C SWITCHING PERFORMANCE Maximum Conversion Rate Full VI 40 60 80 MSPS Minimum Conversion Rate Full IV 5 5 5 MSPS Aperture Delay (t A) +25 °C V 2.7 2.7 2.7 ns Aperture Uncertainty (Jitter) +25 °C V 5 5 5 ps, rms DYNAMIC PERFORMANCE 3 Transient Response +25 °C V 999 n s Overvoltage Recovery Time +25 °C V 999 n s Signal-to-Noise Ratio (SINAD) (With Harmonics) fIN = 10.3 MHz +25 °C I 42 45.5 42 45 41.5 45 dB fIN = 76 MHz +25 °C V 44.0 43.5 43.5 dB Effective Number of Bits fIN = 76 MHz +25 °C V 7.0 6.9 6.9 Bits Signal-to-Noise Ratio (SNR) (Without Harmonics) fIN = 10.3 MHz +25 °C I 43 46.5 43 46 42.5 46 dB fIN = 76 MHz +25 °C V 45.5 45 45 dB 2nd Harmonic Distortion fIN = 10.3 MHz +25 °C I –50 –62 –50 –62 –50 –62 dBc fIN = 76 MHz +25 °C V –54 –54 –54 dBc 3rd Harmonic Distortion fIN = 10.3 MHz +25 °C I –46 –60 –46 –60 –46 –60 dBc fIN = 76 MHz +25 °C V –54 –54 –54 dBc Two Tone Intermodulation Distortion (IMD) +25 °C V –52 –52 –52 dBc Differential Phase +25 °C V 0.8 0.8 0.8 Degrees Differential Gain +25 °C V 1.0 1.0 1.0 % DIGITAL INPUTS Logic “1” Voltage Full VI 2.0 2.0 2.0 V Logic “0” Voltage Full VI 0.8 0.8 0.8 V Logic “1” Current Full VI ± 1 ± 1 ± 1 µA Logic “0” Current Full VI ± 1 ± 1 ± 1 µA Input Capacitance +25 °C V 4.5 4.5 4.5 pF Encode Pulse Width High (t EH) +25 °C IV 9.0 166 6.7 166 5.5 166 ns Encode Pulse Width Low (t EL) +25 °C IV 9.0 166 6.7 166 5.5 166 ns (VD = +5 V, VDD = +3 V; external reference)

1Gain error and gain temperature coefficient are based on the ADC only (with a fixed +2.5 V external reference). an ac load of 10 pF or a dc current of ± 40 µA. 3SNR/harmonics based on an analog input voltage of –0.5 dBFS referenced to a 1.0 V full-scale input range. 4Digital supply current based on V DD = +3 V output drive with <10 pF loading under dynamic test conditions. 5Power dissipation is based on specified encode and 10.3 MHz analog input dynamic test conditions (V D = +5 V ± 5%, VDD = +3 V ± 5%). 6Typical thermal impedance for the RS style (SSOP) 20-pin package: θJC = 46°C/W, θCA = 80°C/W, θJA = 126°C/W. Specifications subject to change without notice. Figure 1. Timing Diagram

–4– REV. B ABSOLUTE MAXIMUM RATINGS ORDERING GUIDE Temperature Model Range Package Option* AD9057BRS–40, –60, –80 –40 °C to +85°C RS-20 AD9057/PCB +25 °C Evaluation Board *RS = Shrink Small Outline (SSOP). Table I. Digital Coding (VREF = +2.5 V) Analog Input Voltage Level Digital Output

3.0 V Positive Full Scale 1111 1111

2.502 V Midscale +1/2 LSB 1000 0000

2.498 V Midscale –1/2 LSB 0111 1111

2.0 Negative Full Scale 0000 0000

Pin No. Name Function

1 PWRDN Power-Down Function Select;

Mode (Digital Outputs Go to High Impedance State).

2 VREF OUT Internal Reference Output

(+2.5 V typ); Bypass with 0.1 µF to Ground. 3 VREF IN Reference Input for ADC (+2.5 V typ, ± 10%). 4, 9, 16 GND Ground (Analog/Digital). 5, 8 V D Analog +5 V Power Supply.

6 BIAS OUT Bias Pin for AC Coupling

(1 kΩ to REF IN). 7 AIN Analog Input for ADC.

10 ENCODE Encode Clock for ADC (ADC

ENCODE). 11–14, 17–20 D7–D4, D3–D0 Digital Outputs of ADC. 15 V DD Digital Output Power Supply. Nominally +3 V to +5 V. PIN CONFIGURATION TOP VIEW (Not to Scale) PWRDN D0 (LSB) VREF OUT VREF IN GND AD9057 VDD GNDVD BIAS OUT AIN VD GND ENCODE D7 (MSB) WARNING! ESD SENSITIVE DEVICE CAUTION ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although the AD9057 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality.

nal reference may be applied.

7 AD9057

Figure 14. Capacitively Coupled AD9057 analog input signals are referenced to ground). Figure 15. DC Coupled AD9057 (Inverted VIN) set the ADC gain/offset by connecting VREF OUT to VREF IN. current (for dc biasing the analog input or other user circuitry). configured to interface directly with +3 V or +5 V logic systems. ible with TTL, +5 V CMOS, and +3 V CMOS logic families. digital output HIGH level will change for +5 V or +3 V systems. analog supply to minimize digital noise coupling into the ADC.

connect E8 to E9 (ground to PWRDN). board user at connector Pins 2 and 21. Figure 18. Equivalent Circuits

Figure 19. Evaluation Board Schematic

Figure 20. Evaluation Board Layout

–12– REV. B OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 20-Lead SSOP (RS-20) 20 11 101 0.295 (7.50) 0.271 (6.90) 0.311 (7.9) 0.301 (7.64) 0.212 (5.38) 0.205 (5.21) PIN 1 SEATING PLANE 0.008 (0.203) 0.002 (0.050) 0.07 (1.78) 0.066 (1.67) 0.0256 (0.65) BSC 0.078 (1.98) 0.068 (1.73) 0.009 (0.229) 0.005 (0.127) 0.037 (0.94) 0.022 (0.559) C2156b–2–4/97PRINTED IN U.S.A.