AD7933 Datasheet | Analog Devices

FEATURES Fast throughput rate: 1.5 MSPS Specified for VDD of 2.7 V to 5.25 V Low power 8 m W max at 1.5 MSPS with 3 V supplies 16 m W max at 1.5 MSPS with 5 V supplies 4 analog input channels with a sequencer Software configurable analog inputs 4-channel single-ended inputs 2-channel fully differential inputs 2-channel pseudo-differential inputs Accurate on-chip 2.5 V reference Wide input bandwidth 70 d B SNR at 50 k Hz input frequency No pipeline delays High speed parallel interface- word/byte modes Full shutdown mode: 1 µA max 28 lead TSSOP package 4-Channel, 1.5 MSPS, 12-Bit and 10-Bit Parallel ADCs with a Sequencer AD7933/AD7934 FUNCTIONAL BLOCK DIAGRAM VDD VREFIN/ VREFOUT VIN0 I/P MUX VIN3 T/H 12-/10-BIT SAR ADC AND CONTROL AGND AD7933/AD7934 2.5V VREF CLKIN CONVST BUSY SEQUENCER PARALLEL INTERFACE/CONTROL REGISTER VDRIVE DB0 DB11 CS RD WR W/B DGND Figure 1. GENERAL DESCRIPTION The AD7933/AD7934 are 12-bit and 10-bit, high speed, low power, successive approximation (SAR) ADCs. The parts operate from a single 2.7 V to 5.25 V power supply and feature throughput rates to 1.5 MSPS. The parts contain a low noise, wide bandwidth, differential track-and-hold amplifier that can handle input frequencies up to 20 MHz. The AD7933/AD7934 feature 4 analog input channels with a channel sequencer to allow a consecutive sequence of channels to be converted on. These parts can accept either single-ended, fully differential, or pseudo-differential analog inputs. The conversion process and data acquisition are controlled using standard control inputs, which allows for easy interfacing to microprocessors and DSPs. The input signal is sampled on the falling edge of CONVST and the conversion is also initiated at this point. The AD7933/AD7934 has 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...