AD7470 Analog Devices, AD7470 Datasheet
AD7470
Specifications of AD7470
Available stocks
Related parts for AD7470
AD7470 Summary of contents
Page 1
... CONVST LOGIC AD7470/AD7472 AGND AD7470 IS A 10-BIT PART WITH DB0 TO DB9 AS OUTPUTS. AD7472 IS A 12-BIT PART WITH DB0 TO DB11 AS OUTPUTS also possible to operate the parts in an auto sleep mode, where the part wakes conversion and automatically enters sleep mode at the end of conversion. This method allows very low power dissipation numbers at lower throughput rates ...
Page 2
... The AD7470 functionally works at 2.35 V. Typical specifications @ 25°C for SNR (100 kHz dB; THD (100 kHz) = –84 dB; INL ± 0.8 LSB The AD7470 will typically maintain A-grade performance up to 125°C, with a reduced CLK of 20 MHz @ 5 V and 16 MHz @ 3 V. Typical sleep mode current @ 125°C is 700 nA. 4 Sample tested @ 25°C to ensure compliance. ...
Page 3
... Straight (Natural) Binary 135 135 135 1.2 1.5 1.2 +2.7/+5.25 2.4 900 1.5 800 –3– AD7470/AD7472 = 26 MHz @ 5 V and CLKIN unless otherwise noted.) MAX Unit Test Conditions/Comments f = 1.5 MSPS @ 1.2 MSPS @ typ f = 500 kHz Sine Wave IN dB min f = 100 kHz Sine Wave IN ...
Page 4
... AD7470/AD7472 AD7472–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 ACCURACY Resolution Integral Nonlinearity ...
Page 5
... OUTPUT PIN C L 50pF 200 –5– AD7470/AD7472 unless otherwise noted.) MIN MAX Description t = 1/f CLK CLK IN Wake-Up Time CONVST Pulse Width CONVST to BUSY Delay and B Versions Version ...
Page 6
... 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 AD7470/AD7472 features proprietary ESD protection circuitry, permanent dam- age may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality. Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . 150° ...
Page 7
... REF IN Reference Input. An external reference must be applied to this input. The voltage range for the external reference is 2.5 V ± 1% for specified performance. AV Analog Supply Voltage, 2 5.25 V. This is the only supply voltage for all analog circuitry on the AD7470/ DD AD7472. The AV DD apart even on a transient basis. This supply should be decoupled to AGND. ...
Page 8
... V logic. DB0–DB9/11 Data Bit 0 to Data Bit 9 (AD7470) and DB11 (AD7472). 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 9
... The last transition should occur at the analog value 1.5 LSB below the nominal full scale. The first transition is a 0.5 LSB above the low end of the scale (zero in the case of AD7470/ AD7472). The gain error is the deviation of the actual difference between the first and last code transitions from the ideal differ- ence between the first and last code transitions with offset errors removed ...
Page 10
... The CS and RD lines are then activated in parallel to read the 10- or 12-data bits. The recom- mended REF IN voltage is 2.5 V providing an analog input range 2.5 V, making the AD7470/AD7472 a unipolar ADC recommended to perform a dummy conversion after power-up as the first conversion result could be incorrect. This COMPARATOR also ensures that the part is in the correct mode of operation ...
Page 11
... CLOCK SOURCES The max CLK specification for the AD7470 is 30 MHz, and for the AD7472 MHz. These frequencies are not standard off-the-shelf oscillator frequencies. Many manufacturers pro- duce oscillator modules close to these frequencies; a typical one being 25.175 MHz from IQD Limited. AEL Crystals Limited produces a 25 MHz oscillator module in various packages ...
Page 12
... AD7470/AD7472 PARALLEL INTERFACE The parallel interfaces of the AD7470 and AD7472 are 10 bits and 12 bits wide, respectively. The output data buffers are acti- vated when both CS and RD are logic low. At this point, the con- tents of the data register are placed onto the data bus. Figure 10 shows the timing diagram for the parallel port ...
Page 13
... V supply, the V DRIVE The ADC has better dynamic performance than operating the part while still being able to interface parts, pushes the AD7470/AD7472 to the top bracket of high performance 10-bit/12-bit ADCs. Of course, the ADC can have its V and DV DRIVE ered from supply ...
Page 14
... AD7470/AD7472 Mode 1 Figure 14 shows the AD7472 conversion sequence in Mode 1 using a throughput rate of 500 kSPS and a clock frequency of 26 MHz supply, the current consumption for the part when converting is typically 2 mA, and the quiescent current is typically 650 µA. The conversion time of 531.66 ns contributes 2.658 mW to the overall power dissipation in the following way: (531.66 ns/2 µ ...
Page 15
... TPC 2. Power vs. Throughput (Mode and 3 V) 1.0 0.8 0.6 0.4 0.2 0 –0.2 –0.4 –0.6 –0.8 –1.0 0 512 1024 1536 2048 2560 CODE TPC 3. Typical INL for 2. ° C Typical Performance Characteristics–AD7470/AD7472 –0.2 –0.4 –0.6 –0.8 –1.0 1100 1300 1500 600 650 700 750 3072 3584 4096 1.0 0.8 0.6 0.4 ...
Page 16
... AD7470/AD7472 70.6 70.4 –40 C +25 C 70.2 70.0 69.8 69.6 69.4 69.2 2.50 2.75 3.00 3.25 3.50 3.75 4.00 4.25 4.50 4.75 5.00 5.25 SUPPLY (V) TPC 7. Typical SNR vs. Supply 0 –20 –40 –60 –80 –100 –120 0 100 200 300 FREQUENCY (kHz) TPC 8. Typical SNR @ 500 kHz Input Tone 0.2 –0.3 –0.8 –1.3 +85 C –1.8 –2.3 –2.8 –3.3 –3.8 10 400 500 600 –16– ...
Page 17
... AD7470/ AD7472 should use as large a trace as possible to provide a low impedance path and reduce the effects of glitches on the power supply line ...
Page 18
... PORTC and PORTD of the microcontroller are AD7470/ bidirectional and used to address the AD7470/AD7472 and also AD7472* to read in the 10-bit (AD7470) or 12-bit (AD7472) data. The OE pin on the PIC can be used to enable the output buffers on the AD7470/AD7472 and to perform a read operation. CS ...
Page 19
... CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN (RU-24) Dimensions shown in millimeters 7.90 7.80 7. 4.50 4.40 4.30 6.40 BSC 1 12 0.65 1.20 BSC MAX 0.30 0.20 SEATING 0.19 PLANE 0.09 0.10 COPLANARITY COMPLIANT TO JEDEC STANDARDS MO-153AD –19– AD7470/AD7472 0.75 (0.0295) 45 0.25 (0.0098 1.27 (0.0500) 0.40 (0.0157) 0. 0.60 0.45 ...
Page 20
... AD7470/AD7472 Revision History Location 10/03—Data Sheet changed from REV REV. B. Added Y version . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Universal Changes to SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Changes to TIMING SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Changes to ABSOLUTE MAXIMUM RATINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Changes to ORDERING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Changes to PIN FUNCTION DESCRIPTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Changes to Offset Error description Changes to Gain Error description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Changes to OPERATING MODES section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Changes to POWER-UP section ...