AD7877ACPZ

Product Summary

The AD7877ACPZ is a 12-bit, successive approximation ADC with a synchronous serial interface and low on resistance switches for driving touch screens. The AD7877ACPZ operates from a single 2.7 V to 5.25 V power supply (functional operation to 2.2 V), and features throughput rates of 125kSPS. The AD7877ACPZ features direct battery measurement on two inputs, temperature and touch-pressure measurement. The applications of the AD7877ACPZ include Personal digital assistants, Smart hand-held devices, Touch screen monitors, Point-of-sale terminals, Medical devices, Cell phones, Pagers.

Parametrics

AD7877ACPZ absolute maximum ratings: (1)VCC to GND: -0.3 V to +7 V; (2)Analog Input Voltage to GND: -0.3 V to VCC + 0.3 V; (3)Digital Input Voltage to GND: -0.3 V to VCC + 0.3 V; (4)Digital Output Voltage to GND: -0.3 V to VCC + 0.3 V; (5)VREF to GND: -0.3 V to VCC + 0.3 V; (6)VBAT to GND: -0.3 V to VCC +5 V; (7)Input Current to Any Pin Except Supplies1: 10mA; (8)ESD Rating (IEC 1000-4-2, Air Discharge) Tablet Pins (X+, X., Y+, Y.): 4kV; (9)Other Pins: 2kV; (10)Operating Temperature Range: -40℃ to +85℃; (11)Storage Temperature Range: -65℃ to +150℃; (12)Junction Temperature: 150℃; (13)LFCSP Package Power Dissipation: 450mW; (14)θJA Thermal Impedance: 135.7℃/W; (15)IR Reflow Peak Temperature: 220℃; (16)Pb-Free Parts Only: 260℃ (±0.5℃); (17)Lead Temperature (Soldering 10 sec): 300℃.

Features

AD7877ACPZ features: (1)4-wire touch screen interface; (2)LCD noise reduction feature (STOPACQ pin); (3)Automatic conversion sequencer and timer; (4)User-programmable conversion parameters; (5)On-chip temperature sensor: -40℃ to +85℃; (6)On-chip 2.5 V reference; (7)On-chip 8-bit DAC; (8)3 auxiliary analog inputs; (9)1 dedicated and 3 optional GPIOs; (10)2 direct battery measurement channels (0.5 V to 5 V); (11)3 interrupt outputs; (12)Touch-pressure measurement; (13)Wake up on touch function; (14)Specified throughput rate of 125kSPS; (15)Single supply, VCC of 2.7 V to 5.25 V; (16)Separate VDRIVE level for serial interface; (17)Shutdown mode: 1μA maximum; (18)32-lead, LFCSP, 5 mm × 5 mm package; (19)25-ball,WLCSP, 2.5 mm × 2.8 mm package; (20)Qualified for automotive applications.

Diagrams