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MFG:ADI D/C:09
Part Number: AD7887
MFG: ADI
D/C: 09
Description: The AD7887 is a high speed, low power, 12-bit ADC that oper-ates from a single +2.7 V to +5.25 V power supply. The A...
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AD7887
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DataSheet
General Description
AD7887 General Description
The AD7887 is a high speed, low power, 12-bit ADC that oper-ates from a single +2.7 V to +5.25 V power supply. The AD7887 is capable of 125 kSPS throughput rate. The input track-and- hold acquires a signal in 500 ns and features a single-ended sampling scheme. The output coding for the AD7887 is straight binary and the part is capable of converting full power signals up to 2.5 MHz.
The AD7887 can be configured for either dual or single chan-nel operation, via the on-chip Control Register. There is a default single-channel mode that allows the AD7887 to be operated as a read-only ADC. In single-channel operation, there is one analog input (AIN0) with the V REF/AIN1 pin as-suming its VREF function. This VREF pin allows the user access to the part's internal +2.5 V reference, or the VREF pin can be overdriven by an external reference to provide the reference voltage for the part. This external reference voltage has a range of +2.5 V to VDD. The analog input range on AIN0 is 0 to +VREF.
In dual-channel operation, the VREF/AIN1 pin assumes its AIN1 function, providing a second analog input channel. In this case, the reference voltage for the part is provided via the VDD pin. As a result, the input voltage range on both the AIN0 and AIN1 inputs is 0 to VDD.
AD7887 Maximum Ratings
(TA = +25°C unless otherwise noted)
VDD to AGND . . . . . . . . . . . . . . . . . . . . . . . .0.3 V to +7 V
Analog Input Voltage to AGND . . . . .0.3 V to VDD + 0.3 V
Digital Input Voltage to AGND . . . . .0.3 V to VDD + 0.3 V
Digital Output Voltage to AGND . . . .0.3 V to VDD + 0.3 V
REFIN/REFOUT to AGND . . . . . . . . . .0.3 V to VDD + 0.3 V
Input Current to Any Pin Except Supplies2. . . . . . .±10 mA
Operating Temperature Range
Commercial
A, B Versions . . . . . . . . . . . . . . . . . . . .40°C to +125°C
Storage Temperature Range . . . . . ... .65°C to +150°C
Junction Temperature . . . . . . . . . . . . . . . . . . . . ..+150°C
SOIC, µSOIC Package, Power Dissipation . . . . . .450 mW
JA Thermal Impedance . . . . . . . . . .. . .157°C/W (SOIC)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .205.9°C/W (µSOIC)
JC Thermal Impedance . . . . . . . . . .. . . .56°C/W (SOIC)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .43.74°C/W (µSOIC)
Lead Temperature, Soldering
Vapor Phase (60 sec) . . . . . . . . . . . . . . . . . . . . . .+215°C
Infrared (15 sec) . . . . . . . . . . . . . . . . . . . . . . . . . .+220°C
ESD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4.5 kV
VDD to AGND . . . . . . . . . . . . . . . . . . . . . . . .0.3 V to +7 V
Analog Input Voltage to AGND . . . . .0.3 V to VDD + 0.3 V
Digital Input Voltage to AGND . . . . .0.3 V to VDD + 0.3 V
Digital Output Voltage to AGND . . . .0.3 V to VDD + 0.3 V
REFIN/REFOUT to AGND . . . . . . . . . .0.3 V to VDD + 0.3 V
Input Current to Any Pin Except Supplies2. . . . . . .±10 mA
Operating Temperature Range
Commercial
A, B Versions . . . . . . . . . . . . . . . . . . . .40°C to +125°C
Storage Temperature Range . . . . . ... .65°C to +150°C
Junction Temperature . . . . . . . . . . . . . . . . . . . . ..+150°C
SOIC, µSOIC Package, Power Dissipation . . . . . .450 mW
JA Thermal Impedance . . . . . . . . . .. . .157°C/W (SOIC)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .205.9°C/W (µSOIC)
JC Thermal Impedance . . . . . . . . . .. . . .56°C/W (SOIC)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .43.74°C/W (µSOIC)
Lead Temperature, Soldering
Vapor Phase (60 sec) . . . . . . . . . . . . . . . . . . . . . .+215°C
Infrared (15 sec) . . . . . . . . . . . . . . . . . . . . . . . . . .+220°C
ESD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4.5 kV
AD7887 Features
Specified for VDD of +2.7V to +5.25V
Flexible Power/Throughput Rate Management
Shutdown Mode: 1 A Max
One/Two Single-Ended Inputs
Serial Interface: SPI™/QSPI™/MICROWIRE™/DSP Compatible
8-Lead Narrow SOIC and SOIC Packages
Flexible Power/Throughput Rate Management
Shutdown Mode: 1 A Max
One/Two Single-Ended Inputs
Serial Interface: SPI™/QSPI™/MICROWIRE™/DSP Compatible
8-Lead Narrow SOIC and SOIC Packages
AD7887 Typical Application
-Battery-Powered Systems (Personal Digital Assistants,Medical Instruments, Mobile Communications)
-Instrumentation and Control Systems
-High Speed Modems
-Instrumentation and Control Systems
-High Speed Modems
AD7887 Connection Diagram
AD7887
PDF/DataSheet Download
- Datasheet: AD7887
- File Size: 137055 KB
- Manufacturer: AD [Analog Devices]
- Click here to Download
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