AD7949BCPZRL7 LFCSP-20 A/D conversion chip price is beautiful
summary
The AD7949 is an 8-channel, 14 bit, charge redistribution, successive approximation (SAR) analog-to-digital converter (ADC) powered by a single power supply (VDD).
The AD7949 is built with all the components required by the multi-channel, low-power data acquisition system, including: a true 14 bit SAR ADC without loss of code; 8-channel, low crosstalk multiplexer for configuring input as single ended input (with or without reference ground), differential input or bipolar input; Internal low drift reference voltage source (2.5 V or 4.096 V can be selected) and buffer; Temperature sensor; Selectable single pole filter; And a sequencer used for sequential continuous sampling of multiple channels.
AD7949 uses a simple SPI interface to write configuration registers and receive conversion results. The SPI interface uses a separate power supply (VIO), which is set as the main logic level. Power consumption is proportional to the throughput rate.
The AD7949 is packaged in a 20 pin mini LFCSP and operates from − 40 ° C to+85 ° C.
Product characteristics
14 bit resolution, no loss of code
8-channel multiplexer, input selectable
Unipolar single ended input
Differential input (using reference ground)
Pseudo bipolar input
Throughput rate: 250 kSPS
INL/DNL: ± 0.5/± 0.25 LSB (typical value)
SINAD: 85 dB (20 kHz)
Total harmonic distortion (THD): − 100 dB (20 kHz)
Analog input range: 0 V to VREF (VREF can be up to VDD)
Multiple types of datum sources
Internal selectable 2.5 V or 4.096 V reference source
External buffered reference source (up to 4.096 V)
External reference source (up to VDD)
Internal temperature sensor (TEMP)
Channel sequencer, optional single pole filter, busy indicator
No pipeline delay, SAR architecture
Single power supply operation: 2.3 V to 5.5 V, logic interface voltage: 1.8 V to 5.5 V
Serial interface, compatible with SPI, MICROWIRE, QSPI and DSP
power waste
2.9 mW @ 2.5 V/200 kSPS
10.8 mW @ 5 V/250 kSPS
Standby current: 50 nA
20 pin 4 mm × 4 mm LFCSP package
application
Multi channel system monitoring
Battery powered equipment
Medical instrument: ECG/EKG
Mobile communication: GPS
Power line monitoring
data acquisition
Seismic data acquisition system
Instruments and Apparatuses
The AD7949 is an 8-channel, 14 bit, charge redistribution, successive approximation (SAR) analog-to-digital converter (ADC) powered by a single power supply (VDD).
The AD7949 is built with all the components required by the multi-channel, low-power data acquisition system, including: a true 14 bit SAR ADC without loss of code; 8-channel, low crosstalk multiplexer for configuring input as single ended input (with or without reference ground), differential input or bipolar input; Internal low drift reference voltage source (2.5 V or 4.096 V can be selected) and buffer; Temperature sensor; Selectable single pole filter; And a sequencer used for sequential continuous sampling of multiple channels.
AD7949 uses a simple SPI interface to write configuration registers and receive conversion results. The SPI interface uses a separate power supply (VIO), which is set as the main logic level. Power consumption is proportional to the throughput rate.
The AD7949 is packaged in a 20 pin mini LFCSP and operates from − 40 ° C to+85 ° C.
Product characteristics
14 bit resolution, no loss of code
8-channel multiplexer, input selectable
Unipolar single ended input
Differential input (using reference ground)
Pseudo bipolar input
Throughput rate: 250 kSPS
INL/DNL: ± 0.5/± 0.25 LSB (typical value)
SINAD: 85 dB (20 kHz)
Total harmonic distortion (THD): − 100 dB (20 kHz)
Analog input range: 0 V to VREF (VREF can be up to VDD)
Multiple types of datum sources
Internal selectable 2.5 V or 4.096 V reference source
External buffered reference source (up to 4.096 V)
External reference source (up to VDD)
Internal temperature sensor (TEMP)
Channel sequencer, optional single pole filter, busy indicator
No pipeline delay, SAR architecture
Single power supply operation: 2.3 V to 5.5 V, logic interface voltage: 1.8 V to 5.5 V
Serial interface, compatible with SPI, MICROWIRE, QSPI and DSP
power waste
2.9 mW @ 2.5 V/200 kSPS
10.8 mW @ 5 V/250 kSPS
Standby current: 50 nA
20 pin 4 mm × 4 mm LFCSP package
application
Multi channel system monitoring
Battery powered equipment
Medical instrument: ECG/EKG
Mobile communication: GPS
Power line monitoring
data acquisition
Seismic data acquisition system
Instruments and Apparatuses
process control
