AD7866

Dual 12-Bit, 2-Channel ADC
Fast Throughput Rate

Specified for V_DDof 2.7V to 5.25V
Low Power

Wide Input Bandwidth

Flexible Power/Throughput Rate Management
Simultaneous Conversion/Read
No Pipeline Delays
High-Speed Serial Interface SPI^TM/QSPI^TM/

AV_DD to A_GND . . . . . . . . . . . . . . . . . . . . . . . .........-0.3 V to +7 V
DV_DDto D_GND . . . . . . . . . . . . . . . . . . . . ......... . . 0.3 V to +7 V
V_DRIVEto D_GND . . . . . . . . . . . . . .......... . 0.3 V to DV_DD+ 0.3 V
V_DRIVEto AGND . . . . . . . . . . . . . . . ....... 0.3 V to AV_DD+ 0.3 V
AV_DD to DV_DD. . . . . . . . . . . . . . . . . ....... . . . . . 0.3 V to +0.3 V
AGND to DGND . . . . . . . . . . . . . . . . ........... . . . 0.3 V to +0.3 V
Analog Input Voltage to AGND . . . ......... 0.3 V to AV_DD + 0.3 V
Digital Input Voltage to DGND . . . . . . ........ . . . . 0.3 V to +7 V
V_REFto A_GND . . . . . . . . . . . . . . . .......... . 0.3 V to AV_DD + 0.3 V
Digital Output Voltage to DGND . .0.3 V to V_DRIVE+ 0.3 V
Input Current to Any Pin Except Supplies². . . . . . ...... . ±10 mA
Operating Temperature Range
Commercial (A, B Versions) . . . . . . . . . . . . ...... 40oC to +85^oC

Storage Temperature Range . . . . . . . . . . . . ...65^oC to +150^oC
Junction Temperature . . . . . . . . . . . . . . . . . . . ..... . . . . . .150_^oC
TSSOP Package, Power Dissipation . . . . . . . . . ....... . . . 450 mW

The AD7866 is a dual 12-bit high-speed, low power, successive- approximation ADC. The part operates from a single 2.7 V to 5.25 V power supply and features throughput rates up to 1 MSPS. The device contains two ADCs, each preceded by a low-noise, wide bandwidth track/hold amplifier which can handle input frequencies in excess of 10 MHz.

The conversion process and data acquisition of AD7866 are controlled using standard control inputs allowing easy interfacing to micro processors or DSPs. The input signal is sampled on the falling edge of CSand conversion is also initiated at this point. The conversion time is determined by the SCLK frequency. There are no pipelined delays associated with the part.

The AD7866 uses advanced design techniques to achieve very low power dissipation at high throughput rates. With 3 V supplies and 1 MSPS throughput rate, the part consumes a maximum of 3.8 mA. With 5 V supplies and 1 MSPS, the current consumption is a maximum of 4.8 mA. The part also offers flexible power/ throughput rate management when operating in sleep mode. The analog input range for the part can be selected to be a 0 Vto V_REF range or a 2 *VREFrange with eitherstraight binary ortwo's complement output coding. The AD7866 has anon-chip 2.5 V reference which can be overdriven if an externalreference is preferred. Each on-board ADC can also be supplied with a separate individual external reference. The AD7866 is available in a 20-lead thin shrink small outline (TSSOP) package.