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MFG:ADI D/C:09
Part Number: AD7998
MFG: ADI
D/C: 09
Description: The AD7997/AD7998 are 8-channel, 10- and 12-bit, low power, successive approximation ADCs with an I2C-...
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AD7998
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DataSheet
General Description
AD7998 General Description
The AD7997/AD7998 are 8-channel, 10- and 12-bit, low power, successive approximation ADCs with an I2C-compatible interface. The parts operate from a single 2.7 V to 5.5 V power supply and feature a 2 s conversion time. The parts contain an 8-channel multiplexer and track-and-hold amplifier that can handle input frequencies up to 11 MHz.
The AD7997/AD7998 provide a 2-wire serial interface that is compatible with I2C interfaces. Each part comes in two versions, AD7997-0/AD7998-0 and AD7997-1/AD7998-1, and each version allows at least two different I2C addresses. The I2C interface on the AD7997-0/AD7998-0 supports standard and fast I2C interface modes. The I2C interface on the AD7997-1/ AD7998-1 supports standard, fast, and high speed I2C interface modes.
The AD7997/AD7998 normally remain in a shutdown state while not converting, and power up only for conversions. The conversion process can be controlled using the CONVST pin, by a command mode where conversions occur across I2C write operations or an automatic conversion interval mode selected through software control.
The AD7997/AD7998 require an external reference that should be applied to the REFIN pin and can be in the range of 1.2 V to VDD. This allows the widest dynamic input range to the ADC.
On-chip limit registers can be programmed with high and low limits for the conversion result, and an open-drain, out-of-range indicator output (ALERT) becomes active when the programmed high or low limits are violated by the conversion result. This output can be used as an interrupt.
AD7998 Maximum Ratings
VDD to GND........................................................−0.3 V to 7 V
Analog Input Voltage to GND...............−0.3 V to VDD + 0.3 V
Reference Input Voltage to GND..........−0.3 V to VDD + 0.3 V
Digital Input Voltage to GND...........................−0.3 V to +7 V
Digital Output Voltage to GND.............−0.3 V to VDD + 0.3 V
Input Current to Any Pin Except Supplies1...............±10 mA
Operating Temperature Range
Commercial (B Version)...............................−40°C to +85°C
Storage Temperature Range....................−65°C to +150°C
Junction Temperature................................................150°C
20-Lead TSSOP
JA Thermal Impedance.........................................143°C/W
JC Thermal Impedance...........................................45°C/W
Pb/SN Temperature, Soldering
Reflow (10 s to 30 s).....................................240 (+0/-5)°C
Pb-free Temperature, Soldering
Reflow................................................................260 (+0)°C
ESD............................................................................1.5 kV
Analog Input Voltage to GND...............−0.3 V to VDD + 0.3 V
Reference Input Voltage to GND..........−0.3 V to VDD + 0.3 V
Digital Input Voltage to GND...........................−0.3 V to +7 V
Digital Output Voltage to GND.............−0.3 V to VDD + 0.3 V
Input Current to Any Pin Except Supplies1...............±10 mA
Operating Temperature Range
Commercial (B Version)...............................−40°C to +85°C
Storage Temperature Range....................−65°C to +150°C
Junction Temperature................................................150°C
20-Lead TSSOP
JA Thermal Impedance.........................................143°C/W
JC Thermal Impedance...........................................45°C/W
Pb/SN Temperature, Soldering
Reflow (10 s to 30 s).....................................240 (+0/-5)°C
Pb-free Temperature, Soldering
Reflow................................................................260 (+0)°C
ESD............................................................................1.5 kV
AD7998 Features
` 10- and 12-bit ADC with fast conversion time: 2 s typ
` 8 single-ended analog input channels
` Specified for VDD of 2.7 V to 5.5 V
` Low power consumption
` Fast throughput rate: up to 188 kSPS
` Sequencer operation
` Automatic cycle mode
` I2C®-compatible serial interface supports standard, fast, and high speed modes
` Out-of-range indicator/alert function
` Pin-selectable addressing via AS
` Shutdown mode: 1 A max
` Temperature range: −40°C to +85°C
` 20-lead TSSOP package
` See the AD7992 and AD7994 for 2-channel and 4-channel equivalent devices, respectively
` 8 single-ended analog input channels
` Specified for VDD of 2.7 V to 5.5 V
` Low power consumption
` Fast throughput rate: up to 188 kSPS
` Sequencer operation
` Automatic cycle mode
` I2C®-compatible serial interface supports standard, fast, and high speed modes
` Out-of-range indicator/alert function
` Pin-selectable addressing via AS
` Shutdown mode: 1 A max
` Temperature range: −40°C to +85°C
` 20-lead TSSOP package
` See the AD7992 and AD7994 for 2-channel and 4-channel equivalent devices, respectively
AD7998 Connection Diagram
AD7998
PDF/DataSheet Download
- Datasheet: AD7998
- File Size: 1081952 KB
- Manufacturer: AD [Analog Devices]
- Click here to Download
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