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AD1555BPZ

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24
REV. B
AD1555/AD1556
–4–
Table I. Dynamic and Noise Typical Performances
Input and Gain MODIN
PGA = 1 (0 dB) PGA = 2.5 (8 dB) PGA = 8.5 (19 dB) PGA = 34 (31 dB) PGA = 128 (42 dB)
Input Range 1.6 V rms 1.6 V rms 636 mV rms 187 mV rms 47 mV rms 12.4 mV rms
Dynamic Range
F
O
= 16 kHz (1/16 ms) 40 dB40dB 40dB 40dB 40dB 40dB
F
O
= 8 kHz (1/8 ms) 69 dB 69 dB 69 dB 69 dB 69 dB 69 dB
F
O
= 4 kHz (1/4 ms) 98 dB 98 dB 98 dB 98 dB 97 dB 91 dB
F
O
= 2 kHz (1/2 ms) 117 dB 117 dB 116.5 dB 114.5 dB 106.5 dB 95 dB
F
O
= 1 kHz (1 ms) 120 dB 120 dB 119.5 dB 117.5 dB 109.5 dB 98 dB
F
O
= 500 Hz (2 ms) 123 dB 123 dB 122.5 dB 120 dB 112.5 dB 101 dB
F
O
= 250 Hz (4 ms) 126 dB 126 dB 125.5 dB 123 dB 115.5 dB 104 dB
Equivalent Input Noise
F
O
= 16 kHz (1/16 ms) 15.5 mV rms 15.5 mV rms 6.17 mV rms 1.84 mV rms 470 µV rms 138 µV rms
F
O
= 8 kHz (1/8 ms) 560 µV rms 560 µV rms 220 µV rms 65.5 µV rms 16.4 µV rms 4.5 µV rms
F
O
= 4 kHz (1/4 ms) 20 µV rms 20 µV rms 8 µV rms 2.36 µV rms 661 nV rms 351 nV rms
F
O
= 2 kHz (1/2 ms) 2.25 µV rms 2.25 µV rms 952 nV rms 353 nV rms 225 nV rms 223 nV rms
F
O
= 1 kHz (1 ms) 1.59 µV rms 1.59 µV rms 674 nV rms 250 nV rms 159 nV rms 159 nV rms
F
O
= 500 Hz (2 ms) 1.13 µV rms 1.13 µV rms 477 nV rms 187 nV rms 113 nV rms 111 nV rms
F
O
= 250 Hz (4 ms) 797 nV rms 797 nV rms 338 nV rms 133 nV rms 80 nV rms 79 nV rms
Table Ia. Minimum Dynamic Performances (AD1555AP Only)
*
Input and Gain MODIN PGA = 1 (0 dB) PGA = 2.5 (8 dB) PGA = 8.5 (19 dB) PGA = 34 (31 dB)
F
O
= 1 kHz (1 ms) 116 116 115.5 114 104.5
F
O
= 500 Hz (2 ms) 119 119 118.5 117 107.5
F
O
= 250 Hz (4 ms) 122 122 121.5 120 110.5
*
Not tested in production. Guaranteed by design.
Table Ib. Minimum Dynamic Performances (AD1555BP Only)
*
Input and Gain MODIN PGA = 1 (0 dB) PGA = 2.5 (8 dB) PGA = 8.5 (19 dB) PGA = 34 (31 dB)
F
O
= 1 kHz (1 ms) 116.5 116.5 116 114 104.5
F
O
= 500 Hz (2 ms) 119.5 119.5 119 117 107.5
F
O
= 250 Hz (4 ms) 122.5 122.5 121 120 110.5
*
Not tested in production. Guaranteed by design.
Table II. Filter Characteristics
Output Word Rate F
O
Pass Band –3 dB Frequency Stop Band Group Delay
(Sampling Rate in ms) (Hz) (Hz) (Hz) (ms)
16000 Hz (1/16 ms) 6000 6480 8000 0.984
8000 Hz (1/8 ms) 3000 3267.5 4000 3
4000 Hz (1/4 ms) 1500 1634 2000 6
2000 Hz (1/2 ms) 750 816.9 1000 12
1000 Hz (1 ms) 375 408.5 500 24
500 Hz (2 ms) 187.5 204.2 250 48
250 Hz (4 ms) 93.75 101.4 125 93
REV. B
–5–
AD1555/AD1556
TIMING SPECIFICATIONS
Symbol Min Typ Max Unit
CLKIN Frequency
1
f
CLKIN
0.975 1.024 1.075 MHz
CLKIN Duty Cycle Error 45 55 %
MCLK Output Frequency
1
f
CLKIN
/4
SYNC Setup Time t
1
10 ns
SYNC Hold Time t
2
10 ns
CLKIN Rising to MCLK Output Falling on SYNC t
3
20 ns
CLKIN Falling to MCLK Output Rising t
4
20 ns
CLKIN Falling to MCLK Output Falling t
5
20 ns
MCLK Input Falling to MDATA Falling t
6
30 ns
MCLK Input Rising to MDATA and MFLG Valid t
7
100 ns
TDATA Setup Time after SYNC t
8
5ns
TDATA Hold Time t
9
5ns
RESET Setup Time t
10
15 ns
RESET Hold Time t
11
15 ns
CLKIN Falling to DRDY Rising t
12
20 ns
CLKIN Rising to DRDY Falling
2
t
13
20 ns
CLKIN Rising to ERROR Falling t
14
50 ns
RSEL to Data Valid t
15
25 ns
RSEL Setup to SCLK Falling t
16
10 ns
DRDY to Data Valid t
17
25 ns
DRDY High Setup to SCLK Falling t
18
10 ns
R/W to Data Valid t
19
25 ns
R/W High Setup to SCLK Falling t
20
10 ns
CS to Data Valid t
21
25 ns
CS Low Setup to SCLK Falling t
22
10 ns
SCLK Rising to DOUT Valid t
23
25 ns
SCLK High Pulsewidth t
24
25 ns
SCLK Low Pulsewidth t
25
25 ns
SCLK Period t
26
70 ns
SCLK Falling to DRDY Falling
2
t
27
20 ns
CS High or R/W Low to DOUT Hi-Z t
28
20 ns
R/W Low Setup to SCLK Falling t
29
10 ns
CS Low Setup to SCLK Falling t
30
10 ns
Data Setup Time to SCLK Falling t
31
10 ns
Data Hold Time after SCLK Falling t
32
10 ns
R/W Hold Time after SCLK Falling t
33
10 ns
NOTES
1
The gain of the modulator is proportional to f
CLKIN
and MCLK frequency.
2
With DRDYBUF low only. When DRDYBUF is high, this timing also depends on the value of the external pull-down resistor.
Specifications subject to change without notice.
(+V
A
= +5 V 5%; –V
A
= –5 V 5%; AD1555 V
L
= 5 V 5%, AD1556 V
L
= 2.85 V to 5.25 V;
CLKIN = 1.024 MHz; AGND = DGND = 0 V; C
L
= 50 pF; T
A
= T
MIN
to T
MAX
, unless otherwise noted)
I
OH
I
OL
TO OUTPUT
PIN
1.4V
C
L
50pF
500A
1.6mA
Figure 2. Load Circuit for Digital Interface Timing
REV. B
AD1555/AD1556
–6–
CLKIN
SYNC
MCLK
(F
S
)
MDATA
TDATA
t
1
t
2
t
3
t
4
t
5
t
6
t
7
t
8
t
9
DATA VALID DATA VALID
VALIDVALID
Figure 3. AD1555/AD1556 Interface Timing
RESET
CLKIN
SYNC
DRDY
ERROR
t
10
t
11
t
1
t
2
t
12
t
13
t
12
t
14
Figure 4. AD1556 RESET, DRDY, and Overwrite Timings
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24

AD1555BPZ

Mfr. #:
Buy AD1555BPZ
Manufacturer:
Analog Devices Inc.
Description:
Analog to Digital Converters - ADC IC 256 ksps w/PGA
Lifecycle:
New from this manufacturer.
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