AD7820: 8-Bit, 2uS, Sampling A/D Converter
The AD7820 is a high speed, microprocessor-compatible 8-bit ADC which uses a half-flash conversion technique to achieve a conversion time of 1.36 us. The converter has a 0 V to +5 V analog input voltage range with a single +5 V supply.
The half-flash technique consists of 31 comparators, a most significant 4-bit ADC and a least significant 4-bit ADC. The input to the AD7820 is tracked and held by the input sampling circuitry, eliminating the need for an external sample-and-hold for signals with slew rates less than 100 mV/us.
The part is designed for ease of microprocessor interface with the AD7820 appearing as a memory location or I/O port without the need for external interfacing logic. All digital outputs use latched, three-state output buffer circuitry to allow direct connection to a microprocessor data bus or system input port. A non-three state overflow output is also provided to allow cascading of devices to give higher resolution.
AD7820 特点
- Fast Conversion Time: 1.36 us max
- Built-In Track-and-Hold Function
- No Missed Codes
- No User Trims Required
- Single +5V Supply
- Ratiometric Operation
- No External Clock
- Extended Temperature Range Operation
- Skinny 20-Pin DIP, SOIC and 20-Terminal Surface Mount Packages
AD7820 功能框图
| 产品型号 | 产品状态 | 封装 | 引脚 | 温度范围 |
|---|---|---|---|---|
| 5962-88650012A | 量产 | LCC:CER LEADLESS CHIP CARR | 20 | 军用 |
| 5962-8865001RA | 量产 | CERDIP GLASS SEAL | 20 | 军用 |
| 5962-88650022A | 量产 | LCC:CER LEADLESS CHIP CARR | 20 | 军用 |
| 5962-8865002RA | 量产 | CERDIP GLASS SEAL | 20 | 军用 |
| AD7820BQ | 量产 | CERDIP GLASS SEAL | 20 | 工业 |
| AD7820CQ | 量产 | CERDIP GLASS SEAL | 20 | 工业 |
| AD7820KN | 量产 | 20 ld PDIP | 20 | 商业 |
| AD7820KNZ | 量产 | 20 ld PDIP | 20 | 商业 |
| AD7820KP | 量产 | 20 ld PLCC | 20 | 商业 |
| AD7820KP-REEL | 量产 | 20 ld PLCC | 20 | 商业 |
| AD7820KPZ | 量产 | 20 ld PLCC | 20 | 商业 |
| AD7820KPZ-REEL | 量产 | 20 ld PLCC | 20 | 商业 |
| AD7820KR | 量产 | 20 ld SOIC - Wide | 20 | 商业 |
| AD7820KR-REEL | 量产 | 20 ld SOIC - Wide | 20 | 商业 |
| AD7820KRZ | 量产 | 20 ld SOIC - Wide | 20 | 商业 |
| AD7820KRZ-REEL | 量产 | 20 ld SOIC - Wide | 20 | 商业 |
| AD7820LN | 量产 | 20 ld PDIP | 20 | 商业 |
| AD7820LNZ | 量产 | 20 ld PDIP | 20 | 商业 |
| AD7820LP-REEL | 量产 | 20 ld PLCC | 20 | 商业 |
| AD7820LPZ | 量产 | 20 ld PLCC | 20 | 商业 |
| AD7820LR-REEL | 量产 | 20 ld SOIC - Wide | 20 | 商业 |
| AD7820LRZ | 量产 | 20 ld SOIC - Wide | 20 | 商业 |
| AD7820LRZ-REEL | 量产 | 20 ld SOIC - Wide | 20 | 商业 |
| AD7820TCHIPS | 量产 | CHIPS OR DIE | - | 商业 |
| AD7820TQ | 量产 | CERDIP GLASS SEAL | 20 | 军用 |