8-Bit High Speed µP Compatible A/D Converter with Track/Hold Function  - ADC0820-N


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


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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

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Parametrics Compare all products in Precision ADC (<=10MSPS)

Resolution (Bits)
Sample Rate (max) (SPS)
# Input Channels
Multi-Channel Configuration
Input Range (Min) (V)
Input Range (Max) (V)
Integrated Features
Analog Voltage AV/DD (Min) (V)
Analog Voltage AV/DD (Max) (V)
Operating Temperature Range (C)
Approx. Price (US$)
Input Type
THD (Typ) (dB)
INL (Max) (+/-LSB)
SNR (dB)
Reference Mode
ADC0820-N ADC088S022 ADC088S052 ADC088S102
8     8     8     8    
666KSPS     200kSPS     500kSPS     1MSPS    
1     8     8     8    
  Multiplexed     Multiplexed     Multiplexed    
0     0     0     0    
8     5.25     5.25     5.25    
Parallel     Microwire (Serial I/O)
Serial SPI    
Microwire (Serial I/O)
Serial SPI    
Microwire (Serial I/O)
Serial SPI    
4.5     2.7     2.7     2.7    
8     5.25     5.25     5.25    
SAR     SAR     SAR     SAR    
Catalog     Catalog     Catalog     Catalog    
-40 to 85     -40 to 105     -40 to 105     -40 to 105    
16TSSOP     16TSSOP     16TSSOP    
1.55 | 1ku     1.20 | 1ku     1.30 | 1ku     1.50 | 1ku    
Single-Ended     Single-Ended     Single-Ended     Single-Ended    
  -70.1     -70.6     -71.2    
1     0.2     0.2     0.2    
  49.5     49.6     49.6    
Ext     Supply     Supply     Supply