AD7854

Specified for VDD of 3 V_DD to 5.5 V
Read-Only Operation
AD7854200 kSPS; AD7854L100 kSPS
System and Self-Calibration
Low Power
Normal Operation
DD = 3 V)
AD7854L: 5.5 mW (VDD = 3 V)
Automatic Power-Down After Conversion (25uW)
AD7854: 1.3 mW 10 kSPS
AD7854L: 650uW 10 kSPS
Flexible Parallel Interface
12-Bit Parallel/8-Bit Parallel (AD7854)
28-Lead DIP, SOIC and SSOP Packages (AD7854)

(TA = +25°C unless otherwise noted)
AVDD to AGND . . . . . . . . . . . . . . . . . . . . . . . 0.3 V to +7 V
DVDD to DGND . . . . . . . . . . . . . . . . . . . . . . . 0.3 V to +7 V
AV to DV . . . . . . . . . . . . . . . . . . . . . . .. . 0.3 V to +0.3 V
Analog Input Voltage to AGND . . . . 0.3 V to AVDD + 0.3 V
Digital Input Voltage to DGND . . . . 0.3 V to DVDD + 0.3 V
Digital Output Voltage to DGND . . . 0.3 V to DVDD + 0.3 V
REFIN/REFOUT to AGND . . . . . . . . . 0.3 V to AVDD + 0.3 V
Input Current to Any Pin Except Supplies^{2. . . . . . . . . ±10 mA
Operating Temperature Range
Commercial (A, B Versions) . . . . . . . . . . . 40°C to +85°C
Commercial (S Version) . . . . . . . . . . . . . . 55°C to +125°C
Storage Temperature Range . . . . . . . . . . . 65°C to +150°C
Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . +150°C
Cerdip Package, Power Dissipation . . . . . . . . . . . . . . 450 mW
_{JA Thermal Impedance . . . . . . . . . . . . . . . . . . . . . . 75°C/W}
Lead Temperature, (Soldering, 10 secs) . . . . . . . . . +300°C
SOIC, SSOP Package, Power Dissipation . . . . . . . . . 450 mW
JA Thermal Impedance . . . 75°C/W (SOIC) 115°C/W (SSOP)
JC Thermal Impedance . . . 25°C/W (SOIC) 35°C/W (SSOP)
Lead Temperature, Soldering
Vapor Phase (60 secs) . . . . . . . . . . . . . . . . . . . . . . +215°C
Infrared (15 secs) . . . . . . . . . . . . . . . . . . . . . . . . . +220°C}

The AD7854/AD7854L is a high speed, low power, 12-bit ADC that operates from a single 3 V or 5 V power supply, the AD7854 being optimized for speed and the AD7854L for low power. The ADC powers up with a set of default conditions at which time it can be operated as a read-only ADC. The ADC contains self calibration and system calibration options to ensure accurate operation over time and temperature and has a number of power-down options for low power applications.

The AD7854 is capable of 200 kHz throughput rate while the AD7854L is capable of 100 kHz throughput rate. The input track-and-hold acquires a signal in 500 ns and features a pseudo differential sampling scheme. The AD7854 and AD7854L input voltage range is 0 to V_REF (unipolar) and V_REF/2 to +V_REF/2_,

centered at V_REF/2 (bipolar_).The coding is straight binary in unipolar mode and twos complement in bipolar mode. Input signal range is to the supply and the part is capable of converting full-power signals to 100kHz.

CMOS construction ensures low power dissipation of typically 5.4 mW for normal operation and 3.6 W in power-down mode. The part is available in 28-lead, 0.6 inch wide dual-in-line package (DIP), 28-lead small outline (SOIC) and 28-lead small shrink outline (SSOP) packages.