AD9042 Analog Devices, Inc., AD9042 Datasheet
AD9042
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AD9042 Summary of contents
Page 1
... All necessary functions, including track-and-hold (T/H) and reference are included on chip to provide a complete conversion solution. The AD9042 runs off of a single +5 V supply and provides CMOS-compatible digital outputs at 41 MSPS. Designed specifically to address the needs of wideband, multichannel receivers, the AD9042 maintains 80 dB spurious-free dynamic range (SFDR) over a bandwidth of 20 MHz. Noise performance is also exceptional ...
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... REF OFFSET 3 ENCODE driven by single-ended source; ENCODE bypassed to ground through 0.01 F capacitor. 4 ENCODE may also be driven differentially in conjunction with ENCODE; see “Encoding the AD9042” for details. Specifications subject to change without notice. SWITCHING SPECIFICATIONS Parameter (Conditions) Maximum Conversion Rate Minimum Conversion Rate ...
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... Transient Response Overvoltage Recovery Time NOTES 1 All ac specifications tested by driving ENCODE and ENCODE differentially; see “ENCODING the AD9042” for details (Pin 10 on AD9042AST only) tied to GND through 0.01 F capacitor. 3 Analog input signal power at –1 dBFS; signal-to-noise ratio (SNR) is the ratio of signal level to total noise (first five harmonics removed). ...
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... 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 AD9042 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 ...
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... REF 10 through 50 resistor 15 18–27 28 NOTE 1 Output coded as twos complement. AD9042 CUSTOM 28-PIN DIP PACKAGE –5– AD9042 AD9042AD PIN DESCRIPTIONS Name Function GND Ground Power Supply (Digital). CC Powers output stage only. GND Ground. ENCODE Encode input. Data conversion initiated on rising edge ...
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... AD9042 DIE LAYOUT AND MECHANICAL INFORMATION Die Dimensions . . . . . . . . . . . . . . . . 155 Pad Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Metalization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Aluminum Backing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . None Substrate Potential . . . . . . . . . . . . . . . . . . . . . . . . . . . . GND Transistor Count . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2,605 Passivation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Oxynitride Die Attach . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Silver Filled Bond Wire . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Gold DIE LAYOUT W/PAD LABELS DEFINITION OF SPECIFICATIONS Analog Bandwidth The analog input frequency at which the spectral power of the fundamental frequency (as determined by the FFT analysis) is reduced ...
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... Figure 5. Digital Output Stage 2.4V 0.5mA Figure 6. 2.4 V Reference +5V 2,12,14 0.1µF 10k 28 200kHz 8 D11 AIN SINEWAVE 9 V OFFSET 49 REF 4 ENCODE TTL CLOCK OSC ENCODE D0 17 1,3,6,7,11,13 PIN BYPASSED TO GND REF WITH A 0.1µF CAPACITOR. PINS 15,16 ARE NOT CONNECTED. Figure 7. AD9042AD Burn-In Diagram V REF +5V ...
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... AD9042–Typical Performance Characteristics 0 –20 –40 – –80 –100 –120 dc 4.1 8.2 12.3 FREQUENCY – MHz Figure 8. Single Tone at 1.2 MHz 0 –20 –40 – –80 –100 –120 dc 4.1 8.2 12.3 FREQUENCY – MHz Figure 9. Single Tone at 9.6 MHz 0 ENCODE = 41 MSPS –20 AIN = 19.5MHz – ...
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... AIN = 19.5MHz 50 SFDR = 80dB 40 REFERENCE LINE dBc –80 –70 –60 –50 –40 –30 ANALOG INPUT POWER LEVEL – dBFS Figure 15. AD9042AD Single Tone SFDR 100 ENCODE = 41 MSPS 19.3MHz F2 = 19.51MHz 50 SFDR = 80dB 40 REFERENCE LINE –80 –70 – ...
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... AD9042 0 ENCODE = 41 MSPS AIN = 19.5MHz @ –29 dBFS –20 NO DITHER –40 – –80 –100 –120 dc 4.1 8.2 12.3 FREQUENCY – MHz Figure 20. 4K FFT without Dither 100 90 ENCODE = 41 MSPS 80 AIN = 19.5MHz NO DITHER SFDR = 80dB 10 REFERENCE LINE 0 –80 –70 –60 –50 – ...
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... CMOS-compatible, coded as twos complement. APPLYING THE AD9042 Encoding the AD9042 The AD9042 is designed to interface with TTL and CMOS logic families. The source used to drive the ENCODE pin(s) must be clean and free from jitter. Sources with excessive jitter will limit SNR (ref. Equation 1 under “Noise Floor and SNR”). ...
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... Driving the Analog Input Because the AD9042 operates off of a single +5 V supply, the analog input range is offset from ground by 2.4 volts. The analog input, AIN operational amplifier configured in an inverting mode (ref. Equivalent Circuits: Analog Input Stage). ...
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... To minimize capacitive loading, there should only be one gate on each output pin. An example of this is shown in the evaluation board schematics shown in Figures 37 and 38. The digital outputs of the AD9042 have a unique constant slew rate output stage. The output slew rate is about 1 V/ns independent of output loading. A typical CMOS gate combined with PCB trace and through hole will have a load of approxi- mately 10 pF ...
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... Data is latched in a pipeline configuration; a rising edge generates the new AD9042 data sample, latches the previous data at the converter output, and strobes the external data register over J3. Power and ground must be applied power the digital logic section of the evaluation board ...
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... C13 C15 C16 0.1µF 0.1µF 0.1µF Figure 38. AD9042ST/PCB Schematic Table II. AD9042ST/PCB Bill of Material Description Banana Jack Ceramic Chip Capacitor 0805, 0.1 F Tantalum Chip Capacitor 10 F 40-Pin Double Row Male Header BNC Coaxial PCB Connector Surface Mount Resistor 1206, 60.4 ohms Surface Mount Resistor 1206, 499 ohms Surface Mount Resistor 1206, 49 ...
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... R10 R11 R12 R13 Figure 40. AD9042D/PCB Bottom Side Silk Screen M3 C12 C11 a © 1995 USA JB8/KU8 Figure 41. AD9042D/PCB Top Side Copper (Negative) R15 Figure 42. AD9042D/PCB Bottom Side Copper (Negative) –16– REV. A ...
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... C18 Figure 43. AD9042ST/PCB Top Side Silk Screen Figure 44. AD9042ST/PCB Bottom Side Silk Screen REV. A Figure 45. AD9042ST/PCB Top Side Copper (Negative) Figure 46. AD9042ST/PCB Bottom Side Copper (Positive) –17– AD9042 ...
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... AD9042 Figure 47. AD9042ST/PCB Grounded Layer (Negative) +5VA Figure 48. AD9042ST/PCB “Split” Power Layer (Negative) –18– +5V REV. A ...
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... I and Q components separated. These functions are realizable through DSP techniques, however several key technology breakthroughs are required: high dynamic range ADCs such as the AD9042, new DSPs (highly programmable with onboard memory, fast), digital tuner & filter (with programmable frequency and BW) and wide band mixers (high dynamic range with > ...
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... Figure 52. Simplified 5 MHz Wideband “A” Carrier Receiver System Requirements Figure 52 shows a typical wideband receiver subsystem based around the AD9042. This strip consists of a wideband IF filter, amplifier, ADC, latches, channelizer and interface to a digital signal processor. This design shows a typical clocking scheme used in many receiver designs ...
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... For example kHz AMPS signal is being digitized with an AD9042 sampling at 40.96 MSPS, the ratio would be 0.030 MHz/20.48 MHz. Expressed in log form, the processing gain is –10 log (0.030 MHz / 20.48 MHz ...
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... Multitone Performance The plot below shows the AD9042 in a worst case scenario of four strong tones spaced fairly close together. In this plot no dither was used, and the converter still maintained 85 dBFS of spurious-free range. As illustrated previously, a modest amount ...
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... The high dynamic range and excellent noise performance of the AD9042 enable higher image quality medical ultrasound systems. Figure 58 shows the AD9042 used in one channel of the receive chain of a medical ultrasound system. The AD604 receives its input directly from the transducer, or from an external preamp connected to the transducer ...
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... BSC SQ 0.030 (0.75) 0.018 (0.45 SEATING PLANE TOP VIEW (PINS DOWN) 11 0.006 (0.15) 0.039 12 0.002 (0.05) (1.00) REF 0.018 (0.45) 0.031 (0.80) 0.008 (0.20) BSC 0.012 (0.30) 0.003 (0.09) AD9042AD OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 28-Pin Hermetic Ceramic DIP (DH-28 0.595 0.010 (15.11 0.25 0.050 0.010 1.400 0.014 (1.27 0.25) (35.56 0.35) 0.150 (3.81) MIN 0 ...