AD7321 Analog Devices, AD7321 Datasheet - Page 30

• Manufacturer Part Number: AD7321
• Description: 500 kSPS, 2-Channel, Software-Selectable, True Bipolar Input, 12-Bit Plus Sign ADC
• Manufacturer: Analog Devices

Specifications of AD7321

• Resolution (bits): 13bit
• # Chan: 2
• Sample Rate: 500kSPS
• Interface: Ser,SPI
• Analog Input Type: Diff-Uni,SE-Uni
• Ain Range: Bip 10V,Bip 2.5V,Bip 5.0V,Uni 10V
• Adc Architecture: SAR
• Pkg Type: SOP

AD7321
POWER VS. THROUGHPUT RATE
The power consumption of the AD7321 varies with throughput
rate. The static power consumed by the AD7321 is very low, and
significant power savings is achieved as the throughput rate is
reduced. Figure 48 and Figure 49 shows the power vs.
throughput rate for the AD7321 at a V
respectively. Both plots clearly show that the average power
consumed by the AD7321 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 variable SCLK that scales with the sampling
frequency.
12
10
8
6
4
2
0
0
V
V
T
INTERNAL REFERENCE
CC
DD
A
Figure 48. Power vs. Throughput Rate with 3 V V
= 25°C
/V
= 3V
SS
= ±12V
100
THROUGHPUT RATE (kSPS)
200
300
CC
VARIABLE SCLK
of 3 V and 5 V,
400
CC
500
Rev. A | Page 30 of 36
20
18
16
14
12
10
8
6
4
2
0
0
V
V
T
INTERNAL REFERENCE
A
CC
DD
Figure 49. Power vs. Throughput Rate with 5 V V
= 25°C
/V
= 5V
SS
= ±12V
100
VARIABLE SCLK
THROUGHPUT RATE (kSPS)
200
300
400
CC
500