AD7457 Analog Devices, AD7457 Datasheet - Page 8

• Manufacturer Part Number: AD7457
• Description: Pseudo Differential Input, 100 kSPS, 12-Bit ADC in 8-Lead SOT-23
• Manufacturer: Analog Devices

Specifications of AD7457

• Resolution (bits): 12bit
• # Chan: 1
• Sample Rate: 100kSPS
• Interface: Ser,SPI
• Analog Input Type: Diff-Uni
• Ain Range: (Vref) p-p
• Adc Architecture: SAR
• Pkg Type: SOT

AD7457
TYPICAL PERFORMANCE CHARACTERISTICS
T
A
Figure 6. PSRR vs. Supply Ripple Frequency Without Supply Decoupling
= 25°C, f
Figure 5. SINAD vs. Analog Input Frequency for V
–100
–120
–140
–100
–120
–140
–20
–40
–60
–80
–20
–40
–60
–80
75
70
65
0
10
0
0
0
100mV p-p SINE WAVE ON V
NO DECOUPLING ON V
S
= 100 kSPS, f
100
Figure 7. Dynamic Performance for V
V
DD
200
= 3V
SUPPLY RIPPLE FREQUENCY (kHz)
300
30
SCLK
FREQUENCY (kHz)
FREQUENCY (kHz)
400
V
DD
DD
20
= 10 MHz, V
= 3V
500
DD
V
50
DD
= 5V
600
8192 POINT FFT
f
f
SINAD = 71dB
THD = –82dB
SFDR = –83dB
SAMPLE
IN
30
700
= 30kHz
DD
DD
= 2.7 V to 5.25 V, V
DD
= 5 V
= 100kSPS
800
= 3 V and 5 V
V
DD
40
= 5V
900 1000
50
100
Rev. A | Page 8 of 20
REF
= 2.5 V, unless otherwise noted.
10,000
9,000
8,000
7,000
6,000
5,000
4,000
3,000
2,000
1,000
–0.2
–0.4
–0.6
–0.8
–1.0
–0.2
–0.4
–0.6
–0.8
–1.0
1.0
0.8
0.6
0.4
0.2
1.0
0.8
0.6
0.4
0.2
Figure 10. Histogram of 10,000 Conversions of a DC Input
0
2046
0
0
0
0
Figure 8. Typical DNL for the AD7457 for V
Figure 9. Typical INL for the AD7457 for V
2047
1024
1024
27 CODES
2048
CODES
CODES
CODE
CODE
2048
2048
9949
2049
24 CODES
3072
3072
DD
DD
2050
= 5 V
= 5 V
4096
2051
4096