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MFG:ADI D/C:09
Part Number: AD7821
MFG: ADI
D/C: 09
Description: The AD7821 is a high speed, 8-bit, sampling, analog-to-digital converter that offers improved performa...
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AD7821
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DataSheet
General Description
AD7821 General Description
The AD7821 is a high speed, 8-bit, sampling, analog-to-digital converter that offers improved performance over the popular AD7820. It offers a conversion time of 660 ns (vs. 1.36 ms for the AD7820) and 100 kHz signal bandwidth (vs. 6.4 kHz). The sampling instant is better defined and occurs on the falling edge of WR or RD. The provision of a VSS pin (Pin 19) allows the part to operate from ±5 V supplies and to digitize bipolar input signals. Alternatively, for unipolar inputs, the VSS pin can be grounded and the AD7821 will operate from a single +5 V supply, like the AD7820.
The AD7821 has a built-in track-and-hold function capable of digitizing full-scale signals up to 100 kHz max. It also uses a half-flash conversion technique that eliminates the need to generate a CLK signal for the ADC.
The AD7821 is designed with standard microprocessor control signals (CS, RD, WR, RDY, INT) and latched, three-state data outputs capable of interfacing to high speed data buses. An overflow output (OFL) is also provided for cascading devices to achieve higher resolution.
The AD7821 is fabricated in Linear-Compatible CMOS (LC2MOS), an advanced, mixed technology process combining precision bipolar circuits with low power CMOS logic. The part features a low power dissipation of 50 mW.
AD7821 Maximum Ratings
VDD to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.3 V, + 7 V
VSS to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +0.3 V, + 7 V
Digital Input Voltage to GND
(Pins 68, 13) . . . . . . . . . . . . . . . . . . .. . . 0.3 V, VDD + 0.3 V
Digital Output Voltage to GND
(Pins 25, 9, 1418) . . . . . . . . . . . . . . . . 0.3 V, VDD + 0.3 V
VREF(+) to GND . . . . . . . . . . . . . . . . . VSS 0.3 V, VDD + 0.3 V
VREF() to GND . . . . . . . . . . . . . . . . . VSS 0.3 V, VDD + 0.3 V
VIN to GND . . . . . . . . . . . . . . . . . . . . VSS 0.3 V, VDD + 0.3 V
Operating Temperature Range
Commercial (K Version) . . . . . . . . . . . .. . . . .40°C to +85°C
Industrial (B Version) . . . . . . . . . . . . . .. . . . 40°C to +85°C
Extended (T Version) . . . . . . . . . . . . .. . . . 55°C to +125°C
Storage Temperature Range . . . . . . . . . . 65°C to +150°C
Lead Temperature (Soldering, 10 secs) . . . . . . . . . . . +300°C
Power Dissipation (Any Package) to +75°C . . . . . . . 450 mW
Derates above +75°C by . . . . . . . . . . . . . . . . . . . . 6 mW/°C
VSS to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +0.3 V, + 7 V
Digital Input Voltage to GND
(Pins 68, 13) . . . . . . . . . . . . . . . . . . .. . . 0.3 V, VDD + 0.3 V
Digital Output Voltage to GND
(Pins 25, 9, 1418) . . . . . . . . . . . . . . . . 0.3 V, VDD + 0.3 V
VREF(+) to GND . . . . . . . . . . . . . . . . . VSS 0.3 V, VDD + 0.3 V
VREF() to GND . . . . . . . . . . . . . . . . . VSS 0.3 V, VDD + 0.3 V
VIN to GND . . . . . . . . . . . . . . . . . . . . VSS 0.3 V, VDD + 0.3 V
Operating Temperature Range
Commercial (K Version) . . . . . . . . . . . .. . . . .40°C to +85°C
Industrial (B Version) . . . . . . . . . . . . . .. . . . 40°C to +85°C
Extended (T Version) . . . . . . . . . . . . .. . . . 55°C to +125°C
Storage Temperature Range . . . . . . . . . . 65°C to +150°C
Lead Temperature (Soldering, 10 secs) . . . . . . . . . . . +300°C
Power Dissipation (Any Package) to +75°C . . . . . . . 450 mW
Derates above +75°C by . . . . . . . . . . . . . . . . . . . . 6 mW/°C
AD7821 Features
Fast Conversion Time: 660 ns max
100 kHz Track-and-Hold Function
1 MHz Sample Rate
Unipolar and Bipolar Input Ranges
Ratiometric Reference Inputs
No External Clock
Extended Temperature Range Operation
Skinny 20-Pin DlPs, SOIC and 20-Terminal
Surface Mount Packages
100 kHz Track-and-Hold Function
1 MHz Sample Rate
Unipolar and Bipolar Input Ranges
Ratiometric Reference Inputs
No External Clock
Extended Temperature Range Operation
Skinny 20-Pin DlPs, SOIC and 20-Terminal
Surface Mount Packages
AD7821 Connection Diagram
AD7821
PDF/DataSheet Download
- Datasheet: AD7821
- File Size: 952631 KB
- Manufacturer: AD
- Click here to Download
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