AD9040A Analog Devices, Inc., AD9040A Datasheet
AD9040A
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AD9040A Summary of contents
Page 1
... MSPS sample rates with 10-bit resolution. Digital inputs and outputs are CMOS compatible; the analog input requires a signal p-p amplitude. The two-step architecture used in the AD9040A is optimized to provide the best dynamic performance available while maintaining low power requirements of only 940 mW typically; maximum dissi- pation is 1 ...
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... + + + + + + + + +25 C III +25 C III –2– AD9040AJN/JR Typ Max Units 10 Bits 1.0 2.0 LSB 2.5 LSB 1.0 2.0 LSB 2.5 LSB Guaranteed 0.5 1 ppm p ...
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... ANALOG –V DIGITAL INPUTS . . . . . . . . . . . . . . . . . . . . . . . . . Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . REF Digital Output Current . . . . . . . . . . . . . . . . . . . . . . . . . 20 mA Operating Temperature AD9040AJN/ +70 C Storage Temperature . . . . . . . . . . . . . . . . . – +150 C Maximum Junction Temperature S Lead Soldering Temp (10 sec +300 C NOTES 1 Absolute maximum ratings are limiting values to be applied individually, and beyond which the serviceability of the circuit may be impaired ...
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... D0 (LSB GND GND OUT REF D AD9040A GND REF TOP VIEW (Not to Scale) NC – ENCODE GND – (MSB ...
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... Two-Tone Intermodulation Distortion (IMD) Rejection The ratio of the power of either of two input signals to the power of the strongest third-order IMD signal 2.5k 6.8k BP REF GND V SS Figure 2. Equivalent Circuits –5– AD9040A OUT D0 GND GND BANDGAP OUTPUT CMOS OUTPUT ...
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... ENCODE command. The conversion process begins on the rising edge of this pulse, which should have a 50% ( 10%) duty cycle. Minimum encode rate of the AD9040A is 10 MSPS because of the use of three internal T/H devices. The held analog value of the first track-and-hold is applied to a 5-bit flash converter and a pair of internal T/Hs (shown in the block diagram as a single unit) ...
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... One synthesizer clocks a flat pulse network at a frequency of 19.9609375 MHz to provide the analog input signal; the other synthesizer output is shaped to provide a CMOS 40 MHz sam- pling clock. At the output of the AD9040A, output data reflects an interleaved alias of the input pulse. The repetitive sampling allows the measurement of ADC transient response as shown in performance graphs elsewhere in this data sheet ...
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... AD9040A should be connected to the analog ground plane. The power supplies of the AD9040A should be isolated from the supplies used for external devices; this reduces the amount of noise coupled into the ADC. The digital +5 volt connection ...
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... Figure 8. PCB Top View DAC Reconstruction The AD9040A evaluation board provides an onboard AD9721 reconstruction DAC for observing the digitized analog input signal. The AD9721 is terminated into 51 ohms to provide p-p signal at the output (RC OUTPUT). Output Data The output data bits are latched with a CMOS 74AC574 which drives a 40-pin connector (AMP p/n 102153-9) ...
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... C10 0.1 F 0.1 F 0 74AC574 AD9040AJR REF OUT R18 100 (MSB R17 100 ENC 74AC574 D8 D8 – R16 100 ...
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... FREQUENCY – MHz Figure 18. 0 ENCODE = 40.5 MSPS ANALOG IN = 2.3 MHz SNR = 55.20 dB SNR (w/o har.) = 55.90 dB 2nd HARMONIC = –75.1 dB 3rd HARMONIC = –73.2 dB –65 0 10.1 20.2 FREQUENCY – MHz Figure 21. –11– AD9040A 10.3 MHz CLOCK RATE – MSPS Figure 13. SNR vs. Clock Rate ...
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... AD9040A 28-Lead Plastic DIP (N-28) 1.565 (39.70) 1.380 (35.10 PIN 1 0.250 (6.35) MAX 0.022 (0.558) 0.100 0.070 (1.77) (2.54) 0.014 (0.356) MAX BSC 0.625 (15.87) 0.600 (15.24) 0.015 (0.381) 0.008 (0.204) OUTLINE DIMENSIONS Dimensions shown in inches and (mm) 15 0.550 (13.97) 0.530 (13.46) 14 0.015 (0.38) MIN 0.140 (3.55) MIN SEATING PLANE 0.012 (0.30) 0.004 (0.10) ...