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

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

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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 ADCs (<=10MSPS)

Resolution (Bits)
# Input Channels
Multi-Channel Configuration
Input Type
Power Consumption (Typ) (mW)
Input Range (Min) (V)
Input Range (Max) (V)
Analog Voltage AVDD (Min) (V)
Analog Voltage AVDD (Max) (V)
Operating Temperature Range (C)
THD (Typ) (dB)
SNR (dB)
Reference Mode
ADC0820-N ADC088S022 ADC088S052 ADC088S102
8    8    8    8   
1    8    8    8   
N/A    Multiplexed    Multiplexed    Multiplexed   
Single-Ended    Single-Ended    Single-Ended    Single-Ended   
65    0.9    1.2    1.8   
0    0    0    0   
8    5.25    5.25    5.25   
Parallel    Microwire (Serial I/O)
Microwire (Serial I/O)
Microwire (Serial I/O)
N/A    N/A    N/A    N/A   
4.5    2.7    2.7    2.7   
8    5.25    5.25    5.25   
SAR    SAR    SAR    SAR   
-40 to 85    -40 to 105    -40 to 105    -40 to 105   
20SOIC    16TSSOP    16TSSOP    16TSSOP   
N/A    -70.1    -70.6    -71.2   
  49.5    49.6    49.6   
Ext    Supply    Supply    Supply