AD7921 Analog Devices, AD7921 Datasheet - Page 4

• Manufacturer Part Number: AD7921
• Description: 2-Channel, 2.35 V to 5.25 V, 250 kSPS, 12-Bit A/D Converter
• Manufacturer: Analog Devices

Specifications of AD7921

• Resolution (bits): 12bit
• # Chan: 2
• Sample Rate: 250kSPS
• Interface: Ser,SPI
• Analog Input Type: SE-Uni
• Ain Range: Uni Vdd
• Adc Architecture: SAR
• Pkg Type: SOP,SOT

AD7911/AD7921
Parameter
CONVERSION RATE
POWER REQUIREMENTS
1
2
3
4
Operational from V
See the Terminology section.
Guaranteed by characterization.
See the Power vs. Throughput Rate section.
Conversion Time
Track-and-Hold Acquisition Time
Throughput Rate
V
I
Power Dissipation
DD
DD
Normal Mode (Static)
Normal Mode (Operational)
Full Power-Down Mode (Static)
Full Power-Down Mode (Dynamic)
Normal Mode (Operational)
Full Power-Down
DD
= 2 V, with V
4
IH
= 1.9 V minimum and V
2
IL
A Grade
2.8
290
250
2.35/5.25
3
1.5
4
2
1
0.38
0.2
20
6
5
= 0.1 V maximum.
1
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Unit
μs max
ns max
kSPS max
V min/max
mA typ
mA typ
mA max
mA max
μA max
mA typ
mA typ
mW max
mW max
μW max
Test Conditions/Comments
Digital I/Ps = 0 V or V
V
V
V
V
SCLK on or off, typically 50 nA
V
V
V
V
V
14 SCLK cycles with SCLK at 5 MHz
DD
DD
DD
DD
DD
DD
DD
DD
DD
= 4.75 V to 5.25 V, SCLK on or off
= 2.35 V to 3.6 V, SCLK on or off
= 4.75 V to 5.25 V, f
= 2.35 V to 3.6 V, f
= 5 V, f
= 3 V, f
= 5 V, f
= 3 V, f
= 5 V
SCLK
SCLK
SAMPLE
SAMPLE
= 5 MHz, f
= 5 MHz, f
= 250 kSPS
= 250 kSPS
DD
SAMPLE
SAMPLE
SAMPLE
SAMPLE
= 250 kSPS
= 250 kSPS
= 25 kSPS
= 25 kSPS