AD1556 Analog Devices, AD1556 Datasheet - Page 13

• Manufacturer Part Number: AD1556
• Description: Digital Filter/Decimator for 24-Bit Sigma-Delta A/D Converter
• Manufacturer: Analog Devices

Specifications of AD1556

• Resolution (bits): 24bit
• # Chan: 2
• Sample Rate: 256kSPS
• Interface: Byte,Ser
• Analog Input Type: Diff-Bip,SE-Bip
• Ain Range: Bip 2.25V/(PGA Gain)
• Adc Architecture: Sigma-Delta,Sigma-Delta Modulator
• Pkg Type: LCC

REV. B
TPC 2. FFT (2048 Points) Full-Scale AIN Input, Gain of 34
TPC 3. FFT (16384 Points) Full-Scale AIN Input, Gain of 1
TPC 1. FFT (2048 Points) Full-Scale MODIN Input
–100
–120
–140
–160
–180
–200
–100
–120
–140
–160
–180
–200
–100
–120
–140
–160
–180
–200
–20
–40
–60
–80
–20
–40
–60
–80
–20
–40
–60
–80
0
0
0
0
0
0
50
50
500
100
100
1000
150
150
1500
FREQUENCY – Hz
FREQUENCY – Hz
FREQUENCY – Hz
200
200
2000
250
250
300
300
2500
350
350
Typical Performance Characteristics–
3000
f
SNR = 105.8dB
THD = –114.9dB
f
SNR = 116.7dB
THD = –120dB
f
SNR = 68.2dB
THD = –120dB
IN
IN
IN
400
400
= 24.4Hz
= 24.4Hz
= 24.4Hz
3500
450
450
4000
500
500
–13–
TPC 6. Common-Mode Rejection vs. Temperature
TPC 5. Dynamic Range Distribution (272 Units)
130
120
110
100
150
140
130
120
110
100
35
30
25
20
15
10
90
90
80
TPC 4. Dynamic Range vs. Temperature
5
0
–122
–55
–55
G = 2.5
–35
–35
G = 8.5
G = 34
–121
–15
–15
G = 128
DYNAMIC RANGE – dB
5
5
TEMPERATURE – C
TEMPERATURE – C
–119
G = 128
G = 2.5
25
25
G = 1
AD1555/AD1556
45
45
–118
G = 34
65
65
G = 1
85
G = 8.5
85
–117
105
105
–116
125
125