AD7492_01 AD [Analog Devices], AD7492_01 Datasheet
AD7492_01
Related parts for AD7492_01
AD7492_01 Summary of contents
Page 1
GENERAL DESCRIPTION The AD7492 and AD7492-5 are 12-bit high-speed, low power, successive-approximation ADCs. The parts operate from a single 2 5.25 V power supply and feature throughput rates up to 1.25 MSPS. They contain a low-noise, wide ...
Page 2
AD7492 AD7492-5–SPECIFICATIONS Parameter DYNAMIC PERFORMANCE Signal to Noise + Distortion (SINAD) Signal-to-Noise Ratio (SNR) Total Harmonic Distortion (THD) Peak Harmonic or Spurious Noise (SFDR) Intermodulation Distortion (IMD) Second Order Terms Third Order Terms Aperture Delay Aperture Jitter Full Power Bandwidth ...
Page 3
AD7492–SPECIFICATIONS Parameter DYNAMIC PERFORMANCE Signal to Noise + Distortion (SINAD) Signal-to-Noise Ratio (SNR) Total Harmonic Distortion (THD) Peak Harmonic or Spurious Noise (SFDR) Intermodulation Distortion (IMD) Second Order Terms Third Order Terms Aperture Delay Aperture Jitter Full Power Bandwidth DC ...
Page 4
AD7492 1 TIMING SPECIFICATIONS Limit at T MIN Parameter AD7492 t 880 CONVERT WAKEUP 500 ...
Page 5
ABSOLUTE MAXIMUM RATINGS (T = 25°C unless otherwise noted AGND/DGND . . . . . . . . . . . . . . . . . –0 AGND/DGND ...
Page 6
AD7492 Pin Mnemonic Function 1–3, DB9–DB11, Data Bit 0 to DB11. Parallel digital outputs that provide the conversion result for the part. These are three-state outputs that are controlled by CS and RD. The output high voltage level for these ...
Page 7
TERMINOLOGY Integral Nonlinearity This is the maximum deviation from a straight line passing through the endpoints of the ADC transfer function. The end- points of the transfer function are zero scale, a point 1/2 LSB below the first code transition, ...
Page 8
AD7492 –Typical Performance Characteristics 500 1000 1500 INPUT FREQUENCY – kHz 100 200 350 500 ...
Page 9
CODE 1 0.8 0.6 0.4 0.2 0 –0.2 –0.4 –0.6 –0.8 –1 1023 1534 2045 2556 0 512 CODE CIRCUIT DESCRIPTION CONVERTER OPERATION ...
Page 10
AD7492 + DRIVE DV DD 1nF AD7492 C/ P REF OUT 2.5V 100nF PARALLELED DB0– INTERFACE DB9 (DB11) CS PS/FS CONVST RD BUSY ADC TRANSFER FUNCTION The output coding of the AD7492 is straight binary. ...
Page 11
CONVST BUSY CS RD DBx CONVST BUSY DBx this mode a new conversion should not be initiated until 140 ns after BUSY goes low. This acquisition time allows the track/hold circuit to accurately acquire the input signal. As mentioned earlier, ...
Page 12
AD7492 V DRIVE The V pin is used as the voltage supply to the digital output DRIVE drivers and the digital input circuitry separate supply from AV and DV . The purpose of using a separate supply ...
Page 13
Figure 15 to Figure 17 show a typical graphical representation of Power versus Throughput for the AD7492 when in (a) Mode and 3 V, (b) Mode 2 in full sleep mode @ 5 V and 3 ...
Page 14
AD7492 POWER SUPPLIES Separate power supplies for AV and necessary, DV may share its power connection The digital supply (DV ) must not exceed the analog supply DD ( more than 0.3 ...
Page 15
AD7492 to 80C186 Interface Figure 23 shows the AD7492 interfaced to the 80C186 micropro- cessor. The 80C186 DMA controller provides two independent high-speed DMA channels where data transfer can occur between memory and I/O spaces. (The AD7492 occupies one of ...
Page 16
AD7492 PIN 1 0.0118 (0.30) 0.0040 (0.10) PIN 1 0.006 (0.15) 0.002 (0.05) SEATING PLANE OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 24-Lead SOIC (R-24) 0.6141 (15.60) 0.5985 (15.20 0.2992 (7.60) 0.2914 (7.40) 0.4193 (10.65 ...