AD1556 Analog Devices, AD1556 Datasheet - Page 4

• 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

AD1555/AD1556
Input and Gain
Input Range
Dynamic Range
Equivalent Input Noise
Input and Gain
F
F
F
*
Input and Gain
F
F
F
*
Output Word Rate F
(Sampling Rate in ms)
16000 Hz (1/16 ms)
8000 Hz (1/8 ms)
4000 Hz (1/4 ms)
2000 Hz (1/2 ms)
1000 Hz (1 ms)
500 Hz (2 ms)
250 Hz (4 ms)
Not tested in production. Guaranteed by design.
Not tested in production. Guaranteed by design.
O
O
O
O
O
O
F
F
F
F
F
F
F
F
F
F
F
F
F
F
= 1 kHz (1 ms)
= 500 Hz (2 ms)
= 250 Hz (4 ms)
= 1 kHz (1 ms)
= 500 Hz (2 ms)
= 250 Hz (4 ms)
O
O
O
O
O
O
O
O
O
O
O
O
O
O
= 16 kHz (1/16 ms)
= 8 kHz (1/8 ms)
= 4 kHz (1/4 ms)
= 2 kHz (1/2 ms)
= 1 kHz (1 ms)
= 500 Hz (2 ms)
= 250 Hz (4 ms)
= 16 kHz (1/16 ms)
= 8 kHz (1/8 ms)
= 4 kHz (1/4 ms)
= 2 kHz (1/2 ms)
= 1 kHz (1 ms)
= 500 Hz (2 ms)
= 250 Hz (4 ms)
O
MODIN
1.6 V rms
40 dB
69 dB
98 dB
117 dB
120 dB
123 dB
126 dB
15.5 mV rms
560 µV rms
20 µV rms
2.25 µV rms
1.59 µV rms
1.13 µV rms
797 nV rms
MODIN
116
119
122
MODIN
116.5
119.5
122.5
Table Ib. Minimum Dynamic Performances (AD1555BP Only)
Table Ia. Minimum Dynamic Performances (AD1555AP Only)
Pass Band
(Hz)
6000
3000
1500
750
375
187.5
93.75
Table I. Dynamic and Noise Typical Performances
PGA = 1 (0 dB)
1.6 V rms
40 dB
69 dB
98 dB
117 dB
120 dB
123 dB
126 dB
15.5 mV rms
560 µV rms
20 µV rms
2.25 µV rms
1.59 µV rms
1.13 µV rms
797 nV rms
PGA = 1 (0 dB)
116
119
122
PGA = 1 (0 dB)
116.5
119.5
122.5
Table II. Filter Characteristics
636 mV rms
40 dB
98 dB
116.5 dB
119.5 dB
122.5 dB
125.5 dB
220 µV rms
8 µV rms
952 nV rms
674 nV rms
477 nV rms
PGA = 2.5 (8 dB)
69 dB
6.17 mV rms
338 nV rms
–4–
–3 dB Frequency
(Hz)
6480
3267.5
1634
816.9
408.5
204.2
101.4
PGA = 2.5 (8 dB)
115.5
118.5
121.5
PGA = 2.5 (8 dB)
116
119
121
PGA = 8.5 (19 dB)
187 mV rms
40 dB
69 dB
98 dB
114.5 dB
117.5 dB
120 dB
123 dB
1.84 mV rms
65.5 µV rms
2.36 µV rms
353 nV rms
250 nV rms
187 nV rms
133 nV rms
PGA = 8.5 (19 dB)
114
117
120
PGA = 8.5 (19 dB)
114
117
120
(Hz)
250
125
Stop Band
8000
4000
2000
1000
500
PGA = 34 (31 dB)
47 mV rms
40 dB
69 dB
97 dB
106.5 dB
109.5 dB
112.5 dB
115.5 dB
470 µV rms
16.4 µV rms
661 nV rms
225 nV rms
159 nV rms
113 nV rms
80 nV rms
*
*
PGA = 34 (31 dB)
104.5
107.5
110.5
PGA = 34 (31 dB)
104.5
107.5
110.5
PGA = 128 (42 dB)
12.4 mV rms
40 dB
69 dB
91 dB
95 dB
98 dB
101 dB
104 dB
138 µV rms
4.5 µV rms
351 nV rms
223 nV rms
159 nV rms
111 nV rms
79 nV rms
Group Delay
(ms)
0.984
3
6
12
24
48
93
REV. B