AD7767BRUZ-2 Analog Devices Inc, AD7767BRUZ-2 Datasheet - Page 21

• Manufacturer Part Number: AD7767BRUZ-2
• Description: ADC 24BIT 32KSPS SAR 16-TSSOP
• Manufacturer: Analog Devices Inc

Specifications of AD7767BRUZ-2

• Data Interface: Serial
• Number Of Bits: 24
• Sampling Rate (per Second): 32k
• Number Of Converters: 1
• Power Dissipation (max): 18mW
• Voltage Supply Source: Analog and Digital
• Operating Temperature: -40°C ~ 105°C
• Mounting Type: Surface Mount
• Package / Case: 16-TSSOP (0.173", 4.40mm Width)
• Resolution (bits): 24bit
• Sampling Rate: 128kSPS
• Input Channel Type: Differential, Single Ended
• Supply Voltage Range - Analog: 2.375V To 2.625V
• Number Of Elements: 1
• Resolution: 24Bit
• Architecture: SAR
• Sample Rate: 32KSPS
• Input Polarity: Unipolar
• Input Type: Voltage
• Rated Input Volt: ±2.5V
• Differential Input: Yes
• Power Supply Requirement: Analog and Digital
• Single Supply Voltage (typ): 2.5V
• Single Supply Voltage (min): 2.375V
• Single Supply Voltage (max): 2.625V
• Dual Supply Voltage (typ): Not RequiredV
• Dual Supply Voltage (min): Not RequiredV
• Dual Supply Voltage (max): Not RequiredV
• Power Dissipation: 10.5mW
• Integral Nonlinearity Error: ±7.6ppm
• Operating Temp Range: -40C to 105C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 16
• Package Type: TSSOP
• Input Signal Type: Differential
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: EVAL-AD7767EDZ - BOARD EVAL AD7767 128KSPS 108DBEVAL-AD7767-1EDZ - BOARD EVAL AD7767-1 64KSPS 111DB
• Lead Free Status / Rohs Status: Compliant

ANTIALIASING
The AD7767/AD7767-1/AD7767-2 sample the analog input
at a maximum rate of 1.024 MHz. The on-board digital filter
provides up to 100 dB attenuation for any possible aliasing
frequency in the range from the beginning of the filter stop
band (0.547 × ODR) to where the image of the digital filter pass
band occurs. This occurs at MCLK minus the filter stop band
(MCLK − 0.547 × ODR), as shown in Figure 42.
Table 9 shows the attenuation achieved by various orders of
front-end antialias filters prior to the signal entering the AD7767/
AD7767-1/AD7767-2 at the image of the digital filter stop band,
which is 1.024 MHz − 0.547 × ODR.
Table 9. Antialias Filter Order,
Attenuation at at First Image Point
Model
AD7767
AD7767-1
AD7767-2
The
customers that require extra antialias protection. These devices
sample the signal internally at a rate of 20 MHz to achieve up to
a maximum of 156 kHz or 312 kHz output data rate. This
means that the first alias point of these devices when run at the
maximum speeds is 19.921 MHz and 19.843 MHz, respectively.
POWER DISSIPATION
The AD7767/AD7767-1/AD7767-2 offer exceptional perform-
ance at ultralow power. Figure 43, Figure 44, and Figure 45
show how the current consumption of the AD7767/AD7767-1/
AD7767-2 scales with the MCLK frequency applied to the device.
Both the digital and analog currents scale as the MCLK frequency
is reduced. The actual throughput equals the MCLK frequency
BAND OF INTEREST
AD7764
Figure 42. AD7767/AD7767-1/AD7767 Spectrum
and
Filter Order
First
Second
Third
First
Second
Third
First
Second
Third
ANTIALIAS PROTECTION
DIGITAL FILTER 100dB
AD7765
∑-Δ devices are available to
f
Attenuation at
1.024 MHz – 0.547 × ODR
27 dB
50 dB
70 dB
33 dB
62 dB
89 dB
38 dB
74 dB
110 dB
MCLK
FIRST IMAGE POINT
– (0.547 × ODR)
IMAGE AT
DIGITAL FILTER
f
MCLK
f
MCLK
Rev. C | Page 21 of 24
applied divided by the decimation rate employed by the device
in use. For instance, operating the AD7767 device with an MCLK
of 800 kHz results in an output data rate of 100 kHz due to the
decimate-by-8 filtering.
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
2.5
2.0
1.5
1.0
0.5
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
0
0
0
0
0
Figure 44. AD7767-1 Current vs. MCLK Frequency
Figure 45. AD7767-2 Current vs. MCLK Frequency
Figure 43. AD7767 Current vs. MCLK Frequency
100k
100k
100k
200k
200k
200k
300k
300k
300k
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
400k
400k
400k
500k
500k
500k
AI
600k
AI
600k
600k
I
I
I
REF
REF
REF
DD
DD
700k
700k
700k
DI
DI
DD
DD
800k
800k
800k
DI
DD
900k
900k
900k
AI
AD7767
DD
1000k
1000k
1000k