AD7982BRMZ Analog Devices Inc, AD7982BRMZ Datasheet
AD7982BRMZ
Specifications of AD7982BRMZ
Available stocks
Related parts for AD7982BRMZ
AD7982BRMZ Summary of contents
Page 1
FEATURES 18-bit resolution with no missing codes Throughput: 1 MSPS Low power dissipation 7 MSPS 70 μ kSPS INL: ±1 LSB typical, ±2 LSB maximum Dynamic range True differential analog input range: ±V ...
Page 2
AD7982 TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 Application Diagram Example........................................................ 1 General Description ......................................................................... 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 Timing Specifications .................................................................. 5 Absolute Maximum Ratings............................................................ 6 ESD Caution.................................................................................. 6 Pin Configurations and Function Descriptions ........................... ...
Page 3
SPECIFICATIONS VDD = 2.5 V, VIO = 2 5.5 V, REF = Table 2. Parameter RESOLUTION ANALOG INPUT Voltage Range Absolute Input Voltage Common-Mode Input Range Analog Input CMRR Leakage Current at 25°C Input Impedance ...
Page 4
AD7982 VDD = 2.5 V, VIO = 2 5.5 V, REF = Table 3. Parameter REFERENCE Voltage Range Load Current SAMPLING DYNAMICS −3 dB Input Bandwidth Aperture Delay DIGITAL INPUTS Logic Levels ...
Page 5
TIMING SPECIFICATIONS T = −40°C to +85°C, VDD = 2. 2.63 V, VIO = 2 5.5 V, unless otherwise noted. A Table 4. Parameter Conversion Time: CNV Rising Edge to Data Available Acquisition Time Time Between ...
Page 6
AD7982 ABSOLUTE MAXIMUM RATINGS Table 5. Parameter Analog Inputs 1 IN+, IN− to GND Supply Voltage REF, VIO to GND VDD to GND VDD to VIO Digital Inputs to GND Digital Outputs to GND Storage Temperature Range Junction Temperature θ ...
Page 7
PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS REF 1 10 VDD 2 9 AD7982 IN TOP VIEW (Not to Scale) IN– GND 5 6 Figure 4. 10-Lead MSOP Pin Configuration Table 6. Pin Function Descriptions Pin 1 No. ...
Page 8
AD7982 TERMINOLOGY Integral Nonlinearity Error (INL) INL refers to the deviation of each individual code from a line drawn from negative full scale through positive full scale. The point used as negative full scale occurs ½ LSB before the first ...
Page 9
TYPICAL PERFORMANCE CHARACTERISTICS VDD = 2.5 V, REF = 5.0 V, VIO = 3.3 V. 2.0 POSITIVE INL: +0.79 LSB NEGATIVE INL: –0.68 LSB 1.5 1.0 0.5 0 –0.5 –1.0 –1.5 –2.0 0 65536 131072 CODE Figure 6. Integral Nonlinearity ...
Page 10
AD7982 100 SNR, SINAD 95 90 ENOB 85 80 2.25 2.75 3.25 3.75 4.25 REFERENCE VOLTAGE (V) Figure 12. SNR, SINAD, and ENOB vs. Reference Voltage 100 –55 –35 – TEMPERATURE (°C) ...
Page 11
I VDD 1.2 1.0 0.8 0.6 I REF 0.4 I VIO 0.2 0 2.375 2.425 2.475 2.525 2.575 SUPPLY VOLTAGE (V) Figure 18. Operating Currents vs. Supply Voltage VDD VIO ...
Page 12
AD7982 THEORY OF OPERATION IN+ 131,072C REF GND 131,072C IN– CIRCUIT INFORMATION The AD7982 is a fast, low power, single-supply, precise, 18-bit ADC using a successive approximation architecture. The AD7982 is capable of converting 1,000,000 samples per second (1 MSPS) ...
Page 13
Transfer Functions The ideal transfer characteristic for the AD7982 is shown in Figure 22 and Table 7. 011...111 011...110 011...101 100...010 100...001 100...000 –FSR –FSR + 1 LSB –FSR + 0.5 LSB +FSR – 1.5 LSB ANALOG INPUT Figure 22. ...
Page 14
AD7982 ANALOG INPUTS Figure 24 shows an equivalent circuit of the input structure of the AD7982. The two diodes, D1 and D2, provide ESD protection for the analog inputs, IN+ and IN−. Care must be taken to ensure that the ...
Page 15
SINGLE-TO-DIFFERENTIAL DRIVER For applications using a single-ended analog signal, either bipolar or unipolar, the ADA4941 single-ended-to-differential driver allows for a differential input to the part. The schematic is shown in Figure 26. R1 and R2 set the attenuation ratio between ...
Page 16
AD7982 DIGITAL INTERFACE Although the AD7982 has a reduced number of pins, it offers flexibility in its serial interface modes. When in CS mode, the AD7982 is compatible with SPI, QSPI, digital hosts, and DSPs. In this mode, the AD7982 ...
Page 17
CS MODE, 3-WIRE WITHOUT BUSY INDICATOR This mode is usually used when a single AD7982 is connected to an SPI-compatible digital host. The connection diagram is shown in Figure 29, and the corresponding timing is given in Figure 30. With ...
Page 18
AD7982 CS MODE, 3-WIRE WITH BUSY INDICATOR This mode is usually used when a single AD7982 is connected to an SPI-compatible digital host having an interrupt input. The connection diagram is shown in Figure 31, and the corresponding timing is ...
Page 19
CS MODE, 4-WIRE WITHOUT BUSY INDICATOR This mode is usually used when multiple AD7982s are connected to an SPI-compatible digital host. A connection diagram example using two AD7982s is shown in Figure 33, and the corresponding timing is given in ...
Page 20
AD7982 CS MODE, 4-WIRE WITH BUSY INDICATOR This mode is usually used when a single AD7982 is connected to an SPI-compatible digital host with an interrupt input and when it is desired to keep CNV, which is used to sample ...
Page 21
CHAIN MODE WITHOUT BUSY INDICATOR This mode can be used to daisy-chain multiple AD7982s on a 3-wire serial interface. This feature is useful for reducing component count and wiring connections, for example, in isolated multiconverter applications or for systems with ...
Page 22
AD7982 CHAIN MODE WITH BUSY INDICATOR This mode can also be used to daisy-chain multiple AD7982s on a 3-wire serial interface while providing a busy indicator. This feature is useful for reducing component count and wiring connections, for example, in ...
Page 23
APPLICATION HINTS LAYOUT The printed circuit board that houses the AD7982 should be designed so that the analog and digital sections are separated and confined to certain areas of the board. The pinout of the AD7982, with its analog signals ...
Page 24
... OUTLINE DIMENSIONS PIN 1 INDEX AREA 0.80 0.75 0.70 SEATING PLANE ORDERING GUIDE Model Temperature Range 1 AD7982BRMZ −40°C to +85°C AD7982BRMZRL7 1 −40°C to +85°C 1 AD7982BCPZ −40°C to +85°C AD7982BCPZ-RL7 1 −40°C to +85°C 1 AD7982BCPZ-RL −40°C to +85° EVAL-AD7982CBZ ...