(ACTIVE) 8-Bit High Speed µP Compatible A/D Converter with Track/Hold Function


Functional diagram

Typical Application

Typical Performance


By using a half-flash conversion technique, the 8-bit ADC0820-N CMOS A/D offers a 1.5 µs conversion time and dissipates only 75 mW of power. The half-flash technique consists of 32 comparators, a most significant 4-bit ADC and a least significant 4-bit ADC.

The input to the ADC0820-N is tracked and held by the input sampling circuitry eliminating the need for an external sample-and-hold for signals moving at less than 100 mV/µs.

For ease of interface to microprocessors, the ADC0820-N has been designed to appear as a memory location or I/O port without the need for external interfacing logic.


  • Built-In Track-and-Hold Function
  • No Missing Codes
  • No External Clocking
  • Single Supply—5 VDC
  • Easy Interface to All Microprocessors, or Operates Stand-Alone
  • Latched TRI-STATE Output
  • Logic Inputs and Outputs Meet Both MOS and T2L Voltage Level Specifications
  • Operates Ratiometrically or with any Reference Value Equal to or Less than VCC
  • 0V to 5V Analog Input Voltage Range with Single 5V Supply
  • No Zero or Full-Scale Adjust Required
  • Overflow Output Available for Cascading
  • 0.3 in. Standard Width 20-Pin PDIP
  • 20-Pin PLCC
  • 20-Pin SOIC

Key Specifications

  • Resolution: 8 Bits
  • Conversion Time
    • 2.5 µs Max (RD Mode)
    • 1.5 µs Max (WR-RD Mode)
  • Low Power: 75 mW Max
  • Total Unadjusted Error: ±½ LSB and ± 1 LSB

All trademarks are the property of their respective owners.


Resolution (Bits) 8   
Sample Rate (max) (SPS) 666KSPS   
# Input Channels 1   
Input Type Single-Ended   
Power Consumption (Typ) (mW) 75   
Input Range (Min) (V) 0   
Input Range (Max) (V) 8   
Interface Parallel   
Integrated Features Oscillator   
Analog Voltage AVDD (Min) (V) 4.5   
Analog Voltage AVDD (Max) (V) 8   
Architecture SAR   
Operating Temperature Range (C) -40 to 85   
Pin/Package 20PDIP^20SOIC   
THD (Typ) (dB)  
SNR (dB)  
Reference Mode Ext   

Technical Documents

Datasheet (1)

Solution guides (1)

Other Products in Same Family

© Texas Instruments Inc. Privacy Terms