AD7843ARUZ Analog Devices Inc, AD7843ARUZ Datasheet - Page 10

• Manufacturer Part Number: AD7843ARUZ
• Description: IC ADC 12BIT TOUCHSCREEN 16TSSOP
• Manufacturer: Analog Devices Inc
• Type: Resistiver

Specifications of AD7843ARUZ

• Resolution (bits): 12 b
• Data Interface: Serial
• Touch Panel Interface: 4-Wire
• Number Of Inputs/keys: 1 TSC
• Data Rate/sampling Rate (sps, Bps): 125k
• Voltage Reference: External
• Voltage - Supply: 2.2 V ~ 5.25 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-TSSOP
• Voltage Supply Source: Single Supply
• Sampling Rate (per Second): 125k
• Sampling Rate: 125kSPS
• Supply Current: 240µA
• Digital Ic Case Style: TSSOP
• No. Of Pins: 16
• Operating Temperature Range: -40°C To +85°C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: EVAL-AD7843EBZ - BOARD EVAL FOR AD7843
• Lead Free Status / Rohs Status: Compliant

AD7843
–100
–120
–20
–40
–60
–80
0
0
V
100mV p-p SINEWAVE ON +V
f
SAMPLE
CC
10
Figure 16. AC PSRR vs. Supply Ripple Frequency
= 3V, V
= 125kHz,
20
REF
V
CC
30
= 2.5V
RIPPLE FREQUENCY (kHz)
f
IN
40
= 20kHz
50
CC
60
70
80
90
100
Rev. B | Page 10 of 20
Figure 16 shows the power supply rejection ratio versus V
supply frequency for the AD7843. The power supply rejection
ratio is defined as the ratio of the power in the ADC output at
full-scale frequency f
applied to the ADC V
where:
Pf is the power at frequency f in ADC output.
Pfs is the power at frequency f
supply.
Here a 100 mV p-p sine wave is coupled onto the V
Decoupling capacitors of 10 µF and 0.1 µF were used on the
supply.
PSRR (dB) = 10 log (Pf/Pfs)
S
CC
to the power of a 100 mV sine wave
supply of frequency f
S
coupled onto the ADC V
S
:
CC
supply.
CC
CC