High throughput with low power consumption. Eight analog inputs with a channel sequencer. Accurate on-chip 2.5 V reference. Single-ended, pseudo differential, or fully differential analog inputs that are software selectable. Single-supply operation with VDRIVE function. The VDRIVE function allows the parallel interface to connect directly to 3 V or 5 V processor systems independent of VDD. No pipeline delay. Accurate control of the sampling instant via a CONVST input and once-off conversion control.
The AD7938/AD7939 are 12-bit and 10-bit, high speed, low power, successive approximation (SAR) analog-to-digital converters (ADCs). The parts operate from a single 2.7 V to 5.25 V power supply and feature throughput rates up to 1.5 MSPS. The parts contain a low noise, wide bandwidth, differential track-and-hold amplifier that can handle input frequencies up to 50 MHz.
The AD7938/AD7939 feature eight analog input channels with a channel sequencer that allows a preprogrammed selection of channels to be converted sequentially. These parts can operatewith either single-ended, fully differential, or pseudodifferential analog inputs.
The conversion process and data acquisition are controlled using standard control inputs that allow easy interfacing with microprocessors and DSPs. The input signal is sampled on the falling edge of CONVST and the conversion is also initiated at this point.
The AD7938/AD7939 have an accurate on-chip 2.5 V reference that can be used as the reference source for the analog-to-digital conversion. Alternatively, this pin can be overdriven to provide an external reference.
These parts use advanced design techniques to achieve very low power dissipation at high throughput rates. They also feature flexible power management options. An on-chip control register allows the user to set up different operating conditions, including analog input range and configuration, output coding, power management, and channel sequencing.
Features and Benefits
| Analog to Digital Converters |
Document | note |
AD7938/AD7939: 8-Channel, 1.5 MSPS, 12-Bit and 10-Bit Data Sheet (Rev. C) | PDF 738 kB |
Part Number | Package | Packing Qty | Temp Range | Price 100-499 | Price 1000+ | RoHS |
---|---|---|---|---|---|---|
AD7939BCPZ Production | 32 ld LFCSP (5x5mm) w/3.1mm exposed pad | OTH 490 | -40 to 85C | 5.51 | 4.64 | Y |
AD7939BCPZ-REEL7 Production | 32 ld LFCSP (5x5mm) w/3.1mm exposed pad | REEL 1500 | -40 to 85C | 0 | 4.64 | Y |
AD7939BSUZ Production | 32 ld TQFP (7x7x1.0mm) | OTH 250 | -40 to 85C | 5.51 | 4.64 | Y |
AD7939BSUZ-REEL7 Production | 32 ld TQFP (7x7x1.0mm) | REEL 500 | -40 to 85C | 0 | 4.64 | Y |