The AD7840 is a fast, complete 14-bit voltage output D/A converter. It consists of a 14-bit DAC, 3V buried Zener reference, DAC output amplifier and high speed control logic.
The part features double-buffered interface logic with a 14-bit input latch and 14-bit DAC latch. Data is loaded to the input latch in either of two modes, parallel or serial. This data is then transferred to the DAC latch under control of an a asynchronous LDAC signal. A fast data setup time of 21ns allows direct parallel interfacing to digital signal processors and high speed 16-bit microprocessors. In the serial mode, the maximum serial data clock rate can be as high as 6Mhz.
The analog output from the AD7840 provides a bipolar output range of +-3V. The AD7840 is fully specified for dynamic performance parameters such as signal-to-noise ratio and harmonic distortion as well as for traditional dc specifications. Full power output signals up to 20kHz can be created.
The AD7840 is fabricated in linear compatible CMOS (LC2MOS), an advanced, mixed technology process that combines precision bipolar circuits with low power CMOS logic. The part is available in a 24-pin plastic and hermetic dual-in-line packaged (DIP) and is also packaged in 28-terminal plastic leaded chip carrier (PLCC).
Features and Benefits
| Digital to Analog Converters |
| Document | note |
| AD7840: Complete 14-Bit CMOS DAC Data Sheet (Rev. B) | PDF 337 kB |
| Part Number | Package | Packing Qty | Temp Range | Price 100-499 | Price 1000+ | RoHS |
|---|---|---|---|---|---|---|
| AD7840ARS Last Time Buy | 24 ld SSOP | OTH 59 | -25 to 85C | 0 | 0 | N |
| AD7840ARS-REEL Last Time Buy | 24 ld SSOP | REEL 1500 | -25 to 85C | 0 | 0 | N |
| AD7840ARSZ Production | 24 ld SSOP | OTH 59 | -25 to 85C | 14.8 | 12.02 | Y |
| AD7840ARSZ-REEL Production | 24 ld SSOP | REEL 1500 | -25 to 85C | 0 | 12.62 | Y |
| AD7840JN Production | 24 ld PDIP | OTH 15 | 0 to 70C | 0 | 0 | N |
| AD7840JNZ Production | 24 ld PDIP | OTH 15 | 0 to 70C | 14.15 | 12.02 | Y |
| AD7840JP Last Time Buy | PLCC:PLASTIC LEAD CHIP CAR | OTH 39 | 0 to 70C | 0 | 0 | N |
| AD7840JPZ Production | PLCC:PLASTIC LEAD CHIP CAR | OTH 39 | 0 to 70C | 14.8 | 12.02 | Y |
| AD7840JPZ-REEL Production | PLCC:PLASTIC LEAD CHIP CAR | REEL 750 | 0 to 70C | 0 | 12 | Y |
| AD7840KNZ Last Time Buy | 24 ld PDIP | OTH 15 | 0 to 70C | 16.96 | 14.42 | Y |
| AD7840KP Last Time Buy | PLCC:PLASTIC LEAD CHIP CAR | OTH 39 | 0 to 70C | 0 | 0 | N |
| AD7840KP-REEL Last Time Buy | PLCC:PLASTIC LEAD CHIP CAR | REEL 750 | 0 to 70C | 0 | 14.42 | N |
| AD7840KPZ Production | PLCC:PLASTIC LEAD CHIP CAR | OTH 39 | 0 to 70C | 16.9 | 13.73 | Y |
| AD7840KPZ-RL Production | PLCC:PLASTIC LEAD CHIP CAR | REEL 750 | 0 to 70C | 16.9 | 13.73 | Y |
| AD7840SQ/883B Production | CERDIP GLASS SEAL | OTH 15 | -55 to 125C | 81.84 | 73.65 | N |
