LTC1859 查看數據表（PDF） - Linear Technology
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LTC1859 Datasheet PDF : 22 Pages
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LTC1857/LTC1858/LTC1859
TYPICAL PERFORMANCE CHARACTERISTICS
LTC1859 Power Supply
Feedthrough vs Ripple Frequency
–10
fSAMPLE = 100kHz
–20 VRIPPLE = 60mV
–30
–40
–50
–60
–70
–80
100
1k
10k
100k
RIPPLE FREQUENCY (Hz)
1M
1859 G10
Supply Current vs Supply Voltage
9.0
fSAMPLE = 100kHz
8.5
8.0
7.5
7.0
4.5
4.75
5
5.25
SUPPLY VOLTAGE (V)
5.5
1859 G11
Supply Current vs Temperature
9.0
fSAMPLE = 100kHz
8.5
8.0
7.5
7.0
–50 –25 0
25 50
TEMPERATURE (°C)
75 100
1859 G12
PIN FUNCTIONS
COM (Pin 1): Common Input. This is the reference point
for all single-ended inputs. It must be free of noise and is
usually connected to the analog ground plane.
CH0 (Pin 2): Analog MUX Input.
CH1 (Pin 3): Analog MUX Input.
CH2 (Pin 4): Analog MUX Input.
CH3 (Pin 5): Analog MUX Input.
CH4 (Pin 6): Analog MUX Input.
CH5 (Pin 7): Analog MUX Input.
CH6 (Pin 8): Analog MUX Input.
CH7 (Pin 9): Analog MUX Input.
MUXOUT + (Pin 10): Positive MUX Output. Output of the ana-
log multiplexer. Connect to ADC+ for normal operation.
MUXOUT– (Pin 11): Negative MUX Output. Output of the ana-
log multiplexer. Connect to ADC– for normal operation.
ADC+ (Pin 12): Positive Analog Input to the Analog-to-
Digital Converter.
ADC– (Pin 13): Negative Analog Input to the Analog-to-
Digital Converter.
AGND1 (Pin 14): Analog Ground.
VREF (Pin 15): 2.5V Reference Output. Bypass to analog
ground with a 1µF tantalum capacitor.
REFCOMP (Pin 16): Reference Buffer Output. Bypass to
analog ground with a 10µF tantalum and a 0.1µF ceramic
capacitor. Nominal output voltage is 4.096V.
AGND2 (Pin 17): Analog Ground.
AGND3 (Pin 18): Analog Ground. This is the substrate
connection.
AVDD (Pin 19): 5V Analog Supply. Bypass to analog ground
with a 0.1µF ceramic and a 10µF tantalum capacitor.
DVDD (Pin 20): 5V Digital Supply. Bypass to digital ground
with a 0.1µF ceramic and a 10µF tantalum capacitor.
OVDD (Pin 21): Positive Supply for the Digital Output
Buffers (3V to 5V). Bypass to digital ground with a 0.1µF
ceramic and a 10µF tantalum capacitor.
BUSY (Pin 22): Output shows converter status. It is low
when a conversion is in progress.
SDO (Pin 23): Serial Data Output.
For more information www.linear.com/LTC1857
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