AD7819 Analog Devices, AD7819 Datasheet
AD7819
Specifications of AD7819
Available stocks
Related parts for AD7819
AD7819 Summary of contents
Page 1
... This feature significantly reduces the power consumption of the part at lower throughput rates. The AD7819 can also operate in a high speed mode where the part is not powered down between conversions. In this mode of opera- tion the part is capable of providing 200 kSPS throughput. ...
Page 2
... AD7819–SPECIFICATIONS Parameter DYNAMIC PERFORMANCE 1 Signal to (Noise + Distortion) Ratio 1 Total Harmonic Distortion (THD) 1 Peak Harmonic or Spurious Noise 2 Intermodulation Distortion 2nd Order Terms 3rd Order Terms DC ACCURACY Resolution Minimum Resolution for Which No Missing Codes Are Guaranteed 1 Relative Accuracy 1 Differential Nonlinearity (DNL) 1 Total Unadjusted Error ...
Page 3
... 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 AD7819 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 ...
Page 4
... CONVST 4 CONVST signal. A high-to-low transition on this line initiates the conversion process if the internal CONVST signal is low. Depending on the signal on this pin at the end of a conversion, the AD7819 automatically powers down. CS Chip Select. This is a logic input used in conjunction with RD to enable outputs. ...
Page 5
... N-bit converter with a sine wave input is given by: Signal to (Noise + Distortion) = (6.02N + 1.76) dB Thus for an 8-bit converter, this is 50 dB. Total Harmonic Distortion Total harmonic distortion (THD) is the ratio of the rms sum of harmonics to the fundamental. For the AD7819 it is defined as ...
Page 6
... RESTRIBUTION Analog Input DAC Figure 5 shows an equivalent circuit of the analog input struc- ture of the AD7819. The two diodes, D1 and D2, provide ESD CONTROL protection for the analog inputs. Care must be taken to ensure LOGIC that the analog input signal never exceeds the supply rails by more than 200 mV ...
Page 7
... If, for example, the AD7819 is operated in a continuous sam- pling mode with a throughput rate of 10 kSPS, the power consumption is calculated as follows. The power dissipation during normal operation is 10.5 mW time is 1.5 µs and the conversion time is 4.5 µs, the AD7819 can be said to dissipate 10.5 mW for 6 µs (worst case) during is first applied. DD each conversion cycle. If the throughput rate is 10 kSPS, the cycle time is then 100 µ ...
Page 8
... This signal may be used to initiate an ISR on a microprocessor. At this point the conversion result is latched into the output register where it may be read. The AD7819 has an 8-bit wide parallel interface. The state of the external CONVST signal at the end of conversion also establishes the mode of operation of the AD7819 ...
Page 9
... CS/RD DB7–DB0 PARALLEL INTERFACE The parallel interface of the AD7819 is eight bits wide. The out- put data buffers are activated when both CS and RD are logic low. At this point the contents of the data register are placed on the 8-bit data bus. Figure 15 shows the timing diagram for the par- allel port ...
Page 10
... Port 2. Port 2 latches remain stable when the AD7819 is addressed, as they do not have to be turned around (set to 1) for data input as is the case for Port 0. 8051 AD0– ...
Page 11
... Thin Shrink Small Outline Package (RU-16) 0.201 (5.10) 0.193 (4.90 PIN 1 0.006 (0.15) 0.002 (0.05) 0.0433 (1.10) MAX 0.0118 (0.30) 0.0256 SEATING 0.0079 (0.20) 0.0075 (0.19) (0.65) PLANE 0.0035 (0.090) BSC AD7819 0.325 (8.25) 0.195 (4.95) 0.300 (7.62) 0.115 (2.93) 0.015 (0.381) 0.008 (0.204) 0.0196 (0.50) x 45° 0.0099 (0.25) 8° 0° 0.0500 (1.27) 0.0160 (0.41) 0.028 (0.70) 8° 0.020 (0.50) 0° ...