AD7276BRMZ Analog Devices Inc, AD7276BRMZ Datasheet - Page 21

• Manufacturer Part Number: AD7276BRMZ
• Description: IC ADC 12BIT 3MSPS HS LP 8MSOP
• Manufacturer: Analog Devices Inc

Specifications of AD7276BRMZ

• Data Interface: DSP, MICROWIRE™, QSPI™, Serial, SPI™
• Number Of Bits: 12
• Sampling Rate (per Second): 3M
• Number Of Converters: 1
• Power Dissipation (max): 19.8mW
• Voltage Supply Source: Single Supply
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
• Resolution (bits): 12bit
• Sampling Rate: 3MSPS
• Input Channel Type: Single Ended
• Supply Current: 5.5mA
• Digital Ic Case Style: SOP
• No. Of Pins: 8
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: EVAL-AD7276CBZ - BOARD EVALUATION FOR AD7276
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

POWER VS. THROUGHPUT RATE
Figure 29 shows the power consumption of the device in
normal mode, in which the part is never powered down. By
using the power-down mode of the AD7276/AD7277/AD7278
when not performing a conversion, the average power consump-
tion of the ADC decreases as the throughput rate decreases.
Figure 30 shows that as the throughput rate is reduced, the
device remains in its power-down state longer, and the average
power consumption over time drops accordingly. For example,
if the AD7276/AD7277/AD7278 are operated in continuous
sampling mode with a throughput rate of 200 kSPS and an SCLK
of 48 MHz (V
down mode between conversions, then the power consumption
is calculated as follows. The power dissipation during normal
operation is 12.6 mW (V
dummy cycle, that is, 333 ns, and the remaining conversion
time is 290 ns, then the AD7276/AD7277/AD7278 can be said
to dissipate 12.6 mW for 623 ns during each conversion cycle. If
the throughput rate is 200 kSPS, then the cycle time is 5 μs and
the average power dissipated during each cycle is 623/5,000 ×
12.6 mW = 1.56 mW. Figure 29 shows the power vs. throughput
rate when using the partial power-down mode between conver-
sions at 3 V. The power-down mode is intended for use with
throughput rates of less than 600 kSPS, because at higher
sampling rates, there is no power saving achieved by using the
power-down mode.
DD
= 3 V) and the devices are placed into power-
DD
= 3 V). If the power-up time is one
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7.4
7.2
7.0
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5.6
5.4
5.2
5.0
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4.2
4.0
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3.6
3.4
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3.0
8.0
7.5
7.0
6.5
6.0
5.5
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
Figure 30. Power vs. Throughput Partial Power-Down Mode
0
0
0
Figure 29. Power vs. Throughput Normal Mode
200
400
200
600
AD7276/AD7277/AD7278
THROUGHPUT (kSPS)
THROUGHPUT (kSPS)
800
400
1000 1200 1400 1600 1800
50MHz SCLK
600
800
VARIABLE
SCLK
V
DD
= 3V
2000
1000