AD7888

a +2.7 V to +5.25 V, Micropower, 8-Channel, 125 kSPS, 12-Bit ADC in 16-Lead TSSOP AD7888 FUNCTIONAL BLOCK DIAGRAM AIN1 AIN8 2.5V REF REF IN/REF OUT BUF FEATURES Specified for VDD of +2.7 V to +5.25 V Flexible Power/Throughput Rate Management Shutdown Mode: 1 ␮ A Max Eight Single-Ended Inputs Serial Interface: SPI™/QSPI™/MICROWIRE™/DSP Compatible 16-Lead Narrow SOIC and TSSOP Packages APPLICATIONS Battery-Powered Systems (Personal Digital Assistants, Medical Instruments, Mobile Communications) Instrumentation and Control Systems High Speed Modems AD7888 I/P MUX T/H VDD COMP CHARGE REDISTRIBUTION DAC SAR + ADC CONTROL LOGIC GENERAL DESCRIPTION AGND SPORT AGND The AD7888 is a high speed, low power, 12-bit ADC that operates from a single +2.7 V to +5.25 V power supply. The AD7888 is capable of a 125 kSPS throughput rate. The input track-andhold acquires a signal in 500 ns and features a single-ended sampling scheme. The AD7888 contains eight single-ended analog inputs, AIN1 through AIN8. The analog input on each of these channels is from 0 to VREF. The part is capable of converting full power signals up to 2.5 MHz. The AD7888 features an on-chip 2.5 V reference that can be used as the reference source for the A/D converter. The REF IN/REF OUT pin allows the user access to this reference. Alternatively, this pin can be overdriven to provide an external reference voltage for the AD7888. The voltage range for this external reference is from 1.2 V to VDD. CMOS construction ...