The AD7911/AD7921 are 10-bit and 12-bit, high speed, low power, 2-channel, successive-approximation ADCs respectively. The parts operate from a single 2.35 V to 5.25 V power supply and feature throughput rates up to 250 kSPS. The parts contain a low-noise, wide bandwidth track/hold amplifier, which can handle input frequencies in excess of 6 MHz.
The conversion process and data acquisition are controlled using CS and the serial clock, allowing the devices to interface with microprocessors or DSPs. The input signal is sampled on the falling edge of CS and the conversion is also initiated at this point. There are no pipeline delays associated with the part.
The channel to be converted is selected through the DIN pin and the mode of operation is controlled by CS. The serial data stream from the DOUT pin has a channel identifier bit, which provides information about the channel converted.
The AD7911/AD7921 use advanced design techniques to achieve very low power dissipation at high throughput rates.
The reference for the part is taken internally from VDD. This allows the widest dynamic input range to the ADC. Thus the analog input range for the part is 0 to VDD.
The conversion rate is determined by the SCLK.
Features and Benefits
| Analog to Digital Converters |
| Document | note |
| AD7911/AD7921: 2-Channel, 2.35 V to 5.25 V 250 KSPS, 10-/12-Bit ADCs Data Sheet (Rev. A) | PDF 312 kB |
| Part Number | Package | Packing Qty | Temp Range | Price 100-499 | Price 1000+ | RoHS |
|---|---|---|---|---|---|---|
| AD7911ARM-REEL7 Last Time Buy | 8 ld MSOP | REEL 1000 | -40 to 85C | 0 | 0 | N |
| AD7911ARMZ Production | 8 ld MSOP | OTH 50 | -40 to 85C | 2.94 | 2.46 | Y |
| AD7911ARMZ-REEL Production | 8 ld MSOP | REEL 3000 | -40 to 85C | 0 | 2.46 | Y |
| AD7911ARMZ-REEL7 Production | 8 ld MSOP | REEL 1000 | -40 to 85C | 0 | 2.46 | Y |
| AD7911AUJZ-R2 Production | 8 ld TSOT | REEL 250 | -40 to 85C | 2.94 | 2.9 | Y |
| AD7911AUJZ-REEL7 Production | 8 ld TSOT | REEL 3000 | -40 to 85C | 0 | 2.02 | Y |
