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MFG:ADI D/C:09
Part Number: AD7877
MFG: ADI
D/C: 09
Description: The AD7877 is a 12-bit successive approximation ADC witha synchronousserialinte...
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AD7877
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DataSheet
General Description
AD7877 General Description
The AD7877 is a 12-bit successive approximation ADC with a synchronous serial interface and low on resistance switches for driving touch screens. The AD7877 operates from a single 2.7 V to 5.25 V power supply (functional operation to 2.2V), and features throughput rates of 125 kSPS. The AD7877 features direct battery measurement on two inputs, temperature and touch-pressure measurement.
The AD7877 also has an on-board reference of 2.5 V. When not in use, it can beshut down to conserve power.An external reference can also beapplied and can be varied fro 1 V to+VCC, while the analog input range is from 0 V to VREF. The device includes a shutdo wnmode, which reduces its current consumption to less than 1 µA.
To reduce the effects of noise from LCDs, the acquisition phase of the on-board ADC can be controlled via the STOPACQ pin.User-programmable conversion controls include variable acquisition time and first conversion delay. Up to 16 averages can be taken per conversion. There is also an on-board DAC for LCD backlig ht or contrast control. The AD7877 can run in either slave or master mode, using a conversion sequencer and timer. It is ideal for battery-powered systems such as personal digital assistants with resistive touch screens and other portable equipment.
The part is available in a 32-lead lead frame chip scale package (LFCSP).
AD7877 Maximum Ratings
| Parameter | Rating |
| VCC to GND | -0.3V to +7V |
| Analog Input Voltage to GND | -0.3V to VCC +0.3V |
| Digital Input Voltage to GND | -0.3V to VCC +0.3V |
| Digital Output Voltage to GND | -0.3V to VCC +0.3V |
| VREF to GND | -0.3V to VCC +0.3V |
|
Input Current to Any Pin Except Supplies, |
10mA |
|
ESD Rating |
2.5KV |
| Operating Temperature Range | -40 to +85 |
| Storage Temperature Range | -65 to +150 |
| Junction Temperature | 150 |
| LFCSP package | |
| Power Dissipation | 450mW |
| JA Thermal Impedance | 135.7/W |
| IR Reflow Peak Temperature | 220 |
| Pb-Free Parts Only | 260(±0.5) |
| Lead Temperature(Soldering 10s) | 300 |
AD7877 Features
4-wire touch screen interface
LCD noise reduction feature (STOPACQ pin)
Automatic conversion sequencer and timer
User-programmable conversion parameters
On-chip temperature sensor: −40°C to +85°C
On-chip 2.5 V reference
On-chip 8-bit DAC
3 auxiliary analog inputs
1 dedicated and 3 optional GPIOs
2 direct battery measurement channels (0.5V to 5 V)
3 interrupt outputs
Touch-pressure measurement
Wake up on touch function
Specified throughput rate of 125 kSPS
Single supply, VCC of 2.7 V to 5.25 V
Separate VDRIVE level for serial interface
Shutdown mode: 1 µA maximum
32-lead LFCSP 5 mm x 5 mm package
LCD noise reduction feature (STOPACQ pin)
Automatic conversion sequencer and timer
User-programmable conversion parameters
On-chip temperature sensor: −40°C to +85°C
On-chip 2.5 V reference
On-chip 8-bit DAC
3 auxiliary analog inputs
1 dedicated and 3 optional GPIOs
2 direct battery measurement channels (0.5V to 5 V)
3 interrupt outputs
Touch-pressure measurement
Wake up on touch function
Specified throughput rate of 125 kSPS
Single supply, VCC of 2.7 V to 5.25 V
Separate VDRIVE level for serial interface
Shutdown mode: 1 µA maximum
32-lead LFCSP 5 mm x 5 mm package
AD7877 Typical Application
-Personal digital assistants
-Smart hand-held devices
-Touch screen monitors
-Point-of-sale terminals
-Medical devices
-Cell phones
-Pagers
-Smart hand-held devices
-Touch screen monitors
-Point-of-sale terminals
-Medical devices
-Cell phones
-Pagers
AD7877
PDF/DataSheet Download
- Datasheet: AD7877
- File Size: 2570475 KB
- Manufacturer: AD
- Click here to Download
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