具有跟踪/保持功能的 8 位高速 μP 兼容型模数转换器
| Resolution (Bits) | 8 |
| Number of input channels | 1 |
| Sample rate (Max) (kSPS) | 658 |
| Interface type | Parallel |
| Architecture | SAR |
| Input type | Single-Ended |
| Rating | Catalog |
| Reference mode | Ext |
| Input range (Max) (V) | 8 |
| Input range (Min) (V) | 0 |
| Operating temperature range (C) | -40 to 85 |
| Power consumption (Typ) (mW) | 65 |
| Analog voltage AVDD (Min) (V) | 4.5 |
| Analog voltage AVDD (Max) (V) | 8 |
| INL (Max) (+/-LSB) | 1 |
| Digital supply (Min) (V) | 4.5 |
| Digital supply (Max) (V) | 8 |
- 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: ±? LSB and ± 1 LSB
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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.
