AD7746ARUZ Analog Devices Inc, AD7746ARUZ Datasheet - Page 9

• Manufacturer Part Number: AD7746ARUZ
• Description: IC CONV 2CH CAP TO DGTL 16-TSSOP
• Manufacturer: Analog Devices Inc
• Type: Capacitance-to-Digital Converterr

Specifications of AD7746ARUZ

• Resolution (bits): 24 b
• Data Interface: Serial
• Design Resources: Extending the Capacitive Input Range of AD7745/AD7746 (CN0129)
• Voltage Supply Source: Single Supply
• Voltage - Supply: 2.7 V ~ 5.25 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 16-TSSOP
• Sampling Rate: 90SPS
• Input Channel Type: Differential, Single Ended
• Supply Current: 750µA
• Digital Ic Case Style: TSSOP
• No. Of Pins: 16
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: EVAL-AD7746EBZ - BOARD EVALUATION FOR AD7746
• Sampling Rate (per Second): -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

0.0001
0.001
Figure 12. Capacitance Input Error vs. Leakage Current to GND,
Figure 13. Capacitance Input Error vs. Leakage Current to GND,
0.01
–10
–12
–10
–12
0.1
Figure 14. Capacitance Input Error vs. Resistance in Parallel
–2
–4
–6
–8
–2
–4
–6
–8
10
–250
–250
8
6
4
2
0
8
6
4
2
0
1
1
–200 –150 –100
–200 –150 –100
CIN(+) to EXC = 4 pF, CIN(−) to EXC = 0 pF,
CIN(+) to EXC =4 pF, CIN(−) to EXC = 0 pF,
2.7V
5V
3.3V
10
with Measured Capacitance
3V
PARALLEL RESISTANCE (MΩ)
CIN LEAKAGE TO GND (nA)
CIN LEAKAGE TO GND (nA)
VDD=3.3 V and 5 V
V
DD
= 2.7 V and 3 V
–50
–50
100
0
0
1000
50
50
100
100
10000
150
150
200
200
100000
250
250
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–0.05
–0.10
–0.15
–0.20
–0.2
–0.4
–0.6
–0.8
–1.0
0.20
0.15
0.10
0.05
–10
CIN(+) to EXC = 4 pF, the Same Configuration as in Figure 30
–2
–4
–6
–8
0.2
Figure 16. Capacitance Input Power Supply Rejection (PSR),
0
0
0
Figure 15. Capacitance Input Error vs. Serial Resistance,
2.5
0
CIN(+) to EXC = 21 pF, CIN(−) to EXC = 23 pF, V
0
Figure 17. CAPDAC Differential Nonlinearity (DNL)
16
the Same Configuration as in Figure 34.
1
3.0
32
2
SERIAL RESISTANCE (kΩ)
3.5
48
CAPDAC CODE
3
V
DD
4.0
64
(V)
4
80
AD7745/AD7746
4.5
5
96
DD
5.0
= 5 V,
6
112
128
5.5
7