AD7322 Analog Devices, AD7322 Datasheet - Page 29

• Manufacturer Part Number: AD7322
• Description: Software Selectable True Bipolar Input, 2-Channel, 12-Bit Plus Sign ADC
• Manufacturer: Analog Devices

Specifications of AD7322

• Resolution (bits): 13bit
• # Chan: 2
• Sample Rate: 1MSPS
• Interface: Ser,SPI
• Analog Input Type: Diff-Bip,Diff-Uni,SE-Uni
• Ain Range: Bip (Vref),Bip (Vref) x 2,Bip (Vref) x 4,Bip 10V,Bip 2.5V,Bip 5.0V,Uni (Vref) x 4,Uni 10V
• Adc Architecture: SAR
• Pkg Type: SOP

POWER vs. THROUGHPUT RATE
The power consumption of the AD7322 varies with throughput
rate. The static power consumed by the AD7322 is very low, and
a significant power savings can be achieved as the throughput
rate is reduced. Figure 48 and Figure 49 shows the power vs.
throughput rate for the AD7322 at a V
respectively. Both plots clearly show that the average power
consumed by the AD7322 is greatly reduced as the sample
frequency is reduced. This is true whether a fixed SCLK value is
used or if it is scaled with the sampling frequency. Figure 48 and
Figure 49 show the power consumption when operating in
normal mode for a fixed 20 MHz SCLK and a variable SCLK
that scales with the sampling frequency.
12
10
8
6
4
2
0
0
Figure 48. Power vs. Throughput Rate with 3 V V
100
200
300
THROUGHPUT RATE (kSPS)
400
20MHz SCLK
500
600
V
V
T
INTERNAL REFERENCE
700
CC
A
CC
DD
VARIABLE SCLK
= 25°C
of 3 V and 5 V,
/V
= 3V
SS
800
= ±12V
900 1000
CC
1100
Rev. A | Page 29 of 36
20
18
16
14
12
10
8
6
4
2
0
0
Figure 49. Power vs. Throughput Rate with 5 V V
100
200
300
THROUGHPUT RATE (kHz)
400
500
VARIABLE SCLK
600
V
V
T
INTERNAL REFERENCE
A
CC
DD
= 25°C
/V
700
= 5V
SS
= ±12V
20MHz SCLK
800
900
CC
AD7322
1000