AD7828
FEATURES
4 or 8 Analog Input Channels Built-In Track-and-Hold Function 10 k Hz Signal Handling on Each Channel Fast Microprocessor Interface Single 5 V Supply Low Power: 50 m W Fast Conversion Rate: 2.5 s/Channel Tight Error Specification: 1/2 LSB
LC2MOS High Speed 4- and 8-Channel 8-Bit ADCs
AD7824/AD7828
FUNCTIONAL BLOCK DIAGRAM
VREF (+) VREF (- )
AIN1
4-BIT FLASH
ADC (4MSB)
DB7 DB6 DB5 DB4
AIN4 MUX- AIN8
VREF (+) 16
4-BIT DAC
4-BIT FLASH
ADC (4LSB)
THREESTATE DRIVERS
ADDRESS LATCH
DECODE
A0 A1 A2-
- - AD7824
- 4-CHANNEL MUX
- - AD7828
- 8-CHANNEL MUX
A2
- AD7828 ONLY
TIMING AND CONTROL CIRCUITRY
DB3 DB2 DB1 DB0
GENERAL DESCRIPTION
The AD7824 and AD7828 are high speed, multichannel, 8-bit ADCs with a choice of four (AD7824) or eight (AD7828) multiplexed analog inputs. A half-flash conversion technique gives a fast conversion rate of 2.5 µs per channel, and the parts have a built-in track-and-hold function capable of digitizing full-scale...
