AD7994BRUZ-0 Analog Devices Inc, AD7994BRUZ-0 Datasheet - Page 17
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AD7994BRUZ-0
Manufacturer Part Number
AD7994BRUZ-0
Description
IC ADC 12BIT 4CHAN I2C 16TSSOP
Manufacturer
Analog Devices Inc
Datasheet
1.AD7993BRUZ-0.pdf
(32 pages)
Specifications of AD7994BRUZ-0
Data Interface
I²C, Serial
Number Of Bits
12
Sampling Rate (per Second)
188k
Number Of Converters
1
Power Dissipation (max)
2.2mW
Voltage Supply Source
Single Supply
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
16-TSSOP (0.173", 4.40mm Width)
Resolution (bits)
12bit
Sampling Rate
188kSPS
Input Channel Type
Single Ended
Supply Voltage Range - Analog
2.7V To 5.5V
Supply Current
1.4mA
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With
EVAL-AD7994CBZ - BOARD EVALUATION FOR AD7994CBZ
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
AD7994BRUZ-0
Manufacturer:
AD
Quantity:
1 222
Part Number:
AD7994BRUZ-0
Manufacturer:
ADI/亚德诺
Quantity:
20 000
Company:
Part Number:
AD7994BRUZ-0REEL
Manufacturer:
MICROCHIP
Quantity:
5 700
For ac applications, removing high frequency components from
the analog input signal is recommended by use of an RC band-
pass filter on the relevant analog input pin. In applications
where harmonic distortion and signal-to-noise ratio are critical,
the analog input should be driven from a low impedance
source. Large source impedances significantly affect the ac
performance of the ADC. This may necessitate the use of an
input buffer amplifier. The choice of the op amp is a function of
the particular application.
When no amplifier is used to drive the analog input, the source
impedance should be limited to low values. The maximum
source impedance depends on the amount of total harmonic
distortion (THD) that can be tolerated. THD increases as
the source impedance increases, and performance degrades.
Figure 23 shows the THD vs. the analog input signal frequency
when using supply voltages of 3 V ± 10% and 5 V ± 10%.
Figure 24 shows the THD vs. the analog input signal frequency
for different source impedances.
Rev. 0 | Page 17 of 32
–100
–60
–100
–40
–50
–70
–80
–90
–60
–40
–50
–70
–80
–90
10
10
Figure 23. THD vs. Analog Input Frequency for Various
Figure 24. THD vs. Analog Input Frequency for Various
V
Source Impedances for V
DD
= 2.7V
Supply Voltages, F
INPUT FREQUENCY (kHz)
INPUT FREQUENCY (kHz)
V
V
100
DD
DD
100
S
DD
= 136 kSPS, Mode 1
= 4.5V
= 5V
R
= 5 V, 136 kSPS, Mode 1
R
IN
V
IN
DD
R
= 1000 Ω
= 100 Ω
IN
= 3V
= 10 Ω
AD7993/AD7994
V
DD
V
DD
= 3.3V
= 5.5V
R
IN
V
= 50 Ω
DD
= 5V
1000
1000